Laars NTH1000 Installation And Operation Instructions Manual Download Page 76

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LAARS Heating Systems

Page 72

WARNING

Improper adjustment may lead to poor

combustion quality, increasing the amount of

carbon monoxide produced. Excess carbon

monoxide levels may lead to personal injury or

death.

Primary

burner

Primary

controller

Gas

valve

Gas

valve

Secondary

controller

Secondary

burner

Operator

interface

Boiler 1

Fig. 97 – Primary and Secondary Burners in a Boiler

Fig. 98 – High and Low Fire Adjustments on

Gas Valve - NT 1000

High fire adjustment

Low fire adjustment

Fig. 99 – High and Low Fire Adjustments on

Gas Valve - NT 1700

High fire adjustment

Low fire adjustment

Note –

If you are setting up an NT 1700 unit for

high-altitude operation, you must change the “low

fire” RPM setting (“Minimum Modulation Rate”). See

the instructions in Section 9.7.

Summary of Contents for NTH1000

Page 1: ...es which could cause serious injury property damage or death Improper installation and or operation will void the warranty AVERTISSEMENT Assurez vous de bien suivres les instructions données dans cette notice pour réduire au minimum le risque d incendie ou d explosion ou pour éviter tout dommage matériel toute blessure ou la mort Ne pas entreposer ni utiliser d essence ni d autres vapeurs ou liqui...

Page 2: ...m LC Boiler Flow and Head Requirements 20 5 2 NeoTherm LC Water Heater Flow and Head Requirements 19 Section 6 Water Connections 20 Section 6A NTH Systems 20 6A 1 NTH System Piping Hot Supply Connections 20 6A 2 NTH Cold Water Make Up 20 6A 3 NTH Freeze Protection 21 6A 4 NTH Suggested Piping Schematics 21 6A 5 Condensate Trap 21 Section 6B NTV Systems 27 6B 1 NTV Water Quality 27 6B 2 NTV Piping ...

Page 3: ...ateway Connections to a Building Automation System 80 9 7 Setup for High Altitude Operation NT 1700 Only 80 9 8 Installer Parameters 81 87 Section 10 Initial Startup Instructions 88 10 1 Filling the Boiler System 88 10 2 Initial Operation 89 10 2 1 Initial Burner Operation 89 10 2 2 Combustion Setup Procedure 89 10 3 Shutting Down the NeoTherm LC 89 10 4 Restarting the NeoTherm LC 89 Section 11 Ma...

Page 4: ...LAARS Heating Systems ...

Page 5: ...efore initiating such modifications 1 2 About the NeoTherm LC Touch Screen Display The NeoTherm LC has an advanced control system which can perform many functions This is part of the reason why the NeoTherm LC 1000 or 1700 can deliver such outstanding performance You can access the control system using the Touch Screen Display see Section 8 There are several branches in the control software and ma...

Page 6: ...M FUNCTIONS Some of the functions control all of the controller burner pairs working together as part of the Lead Lag system As an example the setpoint for a whole multiple boiler system is set by a single value Central Heat Lead Lag Setpoint By changing this one value you change the setpoint used by the whole system The action of all of the controller burner pairs will refer back to that single v...

Page 7: ...atest Edition National Fuel Gas Code or 2 CSA B149 1 Natural Gas and Propane Installation Code and with the requirement of the local utility or other authorities having jurisdiction Such applicable requirements take precedence over the general instructions contained herein WARNING Carbon Monoxide Hazard Improper adjustment of the burners may lead to poor combustion quality increasing the amount of...

Page 8: ... Laars com All warranty claims must be made to an authorized LAARS Heating Systems representative Claims must include the serial number and model This information can be found on the rating plate The claim must also include the installation date and name of the installer Shipping costs are not included in the warranty coverage Some accessory items may be shipped in separate packages Verify receipt...

Page 9: ...ectrical box PRV and flow switch Outlet temperature sensors Inlet temperature sensors Condensate trap Leveling feet The Touchscreen does have an internal battery for back up of the date and time settings To access the battery the front panel and the Touchscreen must be removed so that the small plastic door on the back of the touchscreen can be accessed The battery is a CR2032 coin type battery an...

Page 10: ...em sensor kit is included DANGER Water temperature over 125 F 52 C can cause severe burns instantly or death from scalds Children disabled and elderly are at highest risk of being scalded See instruction manual before setting temperature at heating appliance Feel water before bathing or showering If this appliance is used to produce water that could scald if too hot such as domestic hot water use ...

Page 11: ...NeoTherm LC Boilers and Water Heaters Page 7 Fig 6 Dimensions NT 1700 ...

Page 12: ...propriate level above grade or the maximum expected snow line The dimensions and requirements that are shown in Table 1 should be met when choosing the locations for the appliance 2 2 Correct Vent Distance from Outside Wall or Roof Termination The forced draft combustion air blower in the appliance has sufficient power to vent properly when the guidelines in Table 2 are followed Note When located ...

Page 13: ... can take combustion air from the space in which it is installed or the combustion air can be ducted directly to the unit Ventilation air must be provided in either case 3 1 1 Combustion Air From Room In the United States the most common requirements specify that the space shall communicate with the outdoors in accordance with Method 1 or 2 See the following descriptions Where ducts are used they ...

Page 14: ...sible Seal all joints Provide adequate hangers The unit must not support the weight of the combustion air intake pipe The maximum linear pipe length allowed is 100 feet 39 m Subtract 5 allowable linear ft 1 5 m for every elbow used When using polypropylene or stainless steel materials in horizontal duct configurations a single elbow must be installed on the end of the air inlet to act as an outdoo...

Page 15: ...he venting system All components used must be from the same manufacturer and designed for use with exhaust temperatures of 195 F 90 C or higher When installing polypropylene vent systems please refer to the vent supplier s installation instructions for proper installation techniques When using PVC CPVC for the vent material the first 12 inches or 305 mm for Model 1000 or 36 or 915 mm for Model 170...

Page 16: ...nsure the vent system remains sealed See Fig 8 Consideration must be given to the placement and orientation of the flue gas sampling port to ensure that condensate is free to flow back into the NeoTherm LC and not collect anywhere in the vent system including in the flue gas sampling port Exhaust Vent Terminal An exhaust vent terminal must be installed If an exhaust vent terminal is not available ...

Page 17: ...vice regulator vent outlet See note 4 3 feet 91 cm J Clearance to nonmechanical air supply Direct vent only 36 91cm inlet to building or the combustion air inlet Other than Direct vent 4 ft 1 2m below 36 inches 91 cm to any other appliance or to side of opening 1 ft 30 cm above opening K Clearance to a mechanical air supply inlet 3 feet 91 cm above if within 10 feet 3 m 6 feet 1 83 m horizontally ...

Page 18: ...let terminal near a source of corrosive chemical fumes e g cleaning fluid chlorine compounds etc 2 Locate the terminal so that it will not be subject to damage by accident or vandalism It must be at least 7 feet 2 1 m above a public walkway 3 Locate the combustion air terminal so that it cannot be blocked by snow The National Fuel Gas Code requires that it be at least 12 inches 30 cm above grade b...

Page 19: ...that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic the hard wired carbon monoxide with alarm and battery back up may be installed on the next adjacent floor level b In the event that the requirements of the sub division cannot be met at the time of completion of installation the owner shall have a period of thirty 30 days to comply with the above ...

Page 20: ...using the appropri ate tables and guidelines in the National Fuel Gas Code ANSI Z223 1 NFPA 54 and or CSA B149 1 Installation Codes 3 5 Outdoor Installation The NeoTherm LC may only be installed outdoors in applications where the outdoor temperature doesn t drop below freezing For proper operation in outdoor installations the boiler must be equipped with the inlet air and exhaust terminal kits lis...

Page 21: ...oints should be coated with piping compound resistant to the action of liquefied petroleum gas 8 The appliance and its individual shutoff valve must be disconnected from the gas supply piping during any pressure testing of that system at test pressures in excess of 1 2 PSIG 3 45 kPa 9 The unit must be isolated from the gas supply system by closing its individual manual shutoff valve during any pre...

Page 22: ... 90 ELBOW 3 6 4 4 5 2 6 6 7 4 8 5 TEE 4 2 5 3 6 6 8 7 9 9 12 Table 6B Equivalent Pipe Lengths NeoTherm LC NATURAL GAS REQUIRED CU FT SIZE HR 1000 1000 1700 1700 TO SIZE PIPING Measure linear distance from meter outlet to last boiler Add total input of all boilers and divide by 1000 to obtain cu ft hr required Add total equivalent length of fittings used according to Table 6B Align total length pip...

Page 23: ...GPM H L Ft Flow GPM H L Ft 1 000 95 30 75 20 62 15 54 11 48 9 42 7 1 700 161 41 129 27 107 19 92 14 81 11 72 9 Temperature Rise in C Model 11 0 C 13 7 C 16 5 C 19 3 C 22 0 C 24 7 C Flow LPM H L m Flow LPM H L m Flow LPM H L m Flow LPM H L m Flow LPM H L m Flow LPM H L m 1 000 359 9 0 283 6 0 234 4 5 204 3 3 182 2 7 159 2 1 1 700 609 12 3 488 8 1 405 5 7 348 4 3 306 3 3 272 2 7 Temperature Rise Mod...

Page 24: ... 2 5 Table 9 Water Connection Pipe Sizes Section 6 WATER CONNECTIONS Section 6 is divided into TWO parts Section 6A covers NTH units designed for hydronic heating Many installations include indirect domestic hot water Section 6B covers NTV models which are designed exclusively for volume water domestic hot water applications Refer to the proper section for instructions on installing and piping you...

Page 25: ... glycol specifications or the glycol manufacturer for information about specific products maintenance of solutions and set up according to your particular conditions The following manufacturers offer glycols inhibitors and anti foamants that are suitable for use in the NeoTherm LC Please refer to the manufacturers instructions for proper selection and application Sentinel Performance Solutions Gro...

Page 26: ...ontrols Air vent 4 pipe dia max 4 pipe dia max 4 pipe dia max 4 pipe dia max Low temp radiant zone Space heating zone circuits Space heating zone circuit System pump Note This drawing is a schematic representation of a piping style and is not intended to be used as a working installation drawing Local code requirements must be met ...

Page 27: ...ect tank directly off of boiler Air vent 4 pipe dia max Expansion tank Water feed controls 4 pipe dia max Indirect DHW tank Anti scald mixing valve Cold water Domestic hot water out Note This drawing is a schematic representation of a piping style and is not intended to be used as a working installation drawing Local code requirements must be met ...

Page 28: ...iler Low temp radiant zone Low temp radiant zone Air vent Water feed controls Expansion tank 4 pipe dia max Indirect DHW tank Anti scald mixing valve Domestic hot water out Cold water Note This drawing is a schematic representation of a piping style and is not intended to be used as a working installation drawing Local code requirements must be met ...

Page 29: ...Low temp radiant zone Space heating zone circuit Air vent Water feed controls Expansion tank Common piping must be sized for the combined water flow of all of the boilers 4 pipe dia max 4 pipe dia max 4 pipe dia max Note This drawing is a schematic representation of a piping style and is not intended to be used as a working installation drawing Local code requirements must be met ...

Page 30: ...ilers High temp space heating zone circuit 4 pipe dia max 4 pipe dia max 4 pipe dia max Indirect DHW tank Note Indirect pump must be sized for boiler and indirect Anti scald mixing valve Domestic hot water out Cold water Note In this piping arrangement the boiler pump must turn off during DHW operation Note This drawing is a schematic representation of a piping style and is not intended to be used...

Page 31: ...ter heaters must be installed in water conditions of 10 gpg hardness or less with a pH range of 6 5 to 9 5 pH Values outside of this range may reduce the life expectancy of the product Operating the NTV in water with higher hardness levels will cause heat exchanger fouling erosion or corrosion leading to premature component failure reduced efficiency heat exchanger failure or system failure Failur...

Page 32: ...eating applications Fig 18 DHW Piping One Heater Two Vertical Tanks 6B 5 NTV Suggested Piping Schematics Figures 17 19 show suggested piping configurations for NTV boilers These diagrams are only meant as guides All components or piping required by local code must be installed NOTES 1 Optional CWMU recirculation line location 2 Locate the NTV DHW sensor or remote aquastat well in lower 1 3 of tank...

Page 33: ...ale buildup and failure of the heat exchanger 6B 7 Condensate Drain Trap A condensate drain trap is included with the NeoTherm LC and is designed to drain the boiler of condensate The vent condensate should be drained through a drain tee located in the vent line This will help prevent excessive condensate from entering the boiler condensate trap and preventing the boiler from operating Connect a 3...

Page 34: ...ply voltage is toggled as a call for heat signal premature failure of these components may result The NeoTherm LC does not recognize 4 mA as a signal to shut off If the call for heat is not connected between the field interlock terminals NeoTherm LC will remain in low fire when it sees 4 mA as a modulating signal Caution The supply voltage to the NeoTherm LC must not be disengaged except for servi...

Page 35: ...NeoTherm LC Boilers and Water Heaters Page 31 Fig 20 Electronics Panel Layout TB5 TB2 TB1 Primary controller upper burner Secondary controller lower burner TB7 TB6 TB4 TB3 TB10 TB9 ...

Page 36: ...e control panel All 24 VAC power is supplied through a circuit breaker that is part of the transformer The transformer is then connected to terminal blocks 1 and 2 TB1 and TB2 7 4 Signal Connections See Section 9 for details on the following connections System sensor Call for heat thermostat Outdoor air temperature sensor Aquastat for domestic hot water External control connections 7 5 Optional Fi...

Page 37: ...NeoTherm LC Boilers and Water Heaters Page 33 Fig 21 Ladder Diagram ...

Page 38: ...LAARS Heating Systems Page 34 Fig 22 Wiring Diagram ...

Page 39: ...NeoTherm LC Boilers and Water Heaters Page 35 ...

Page 40: ...r configurations each NeoTherm LC will still have it s own Touch Screen but only the Touch Screen on the lead boiler will be active Up to 8 controllers 4 boilers can be displayed on the home screen See Fig 24B Fig 24B Touch Screen shown with the home screen of the lead boiler in a four boiler configuration all conditions normal The icons on the home screen for each controller may appear in one of ...

Page 41: ...r left hand corner Return to Home page Bell Upper left hand corner System in Lockout Reset required Padlock Upper right hand corner Shows whether a password has been entered so parameters can be changed Back Upper right hand corner Return to previous screen Sometimes a screen is used to present a list and often the list is too long to present on a single screen view To see the rest of the list pul...

Page 42: ...stem is running 1 Start at the home screen Fig 29 Fig 29 home screen Single NeoTherm system Blue Normal operation Red Lockout Gray Standby mode Burner switch off Blue Normal operation Gray and crossed out Communication problem Yellow Hold state This could be Anti short cycle fan speed transitions etc 2 Press the View Lead Lag button to go to a screen that shows the status of the whole Lead Lag sys...

Page 43: ...al controller you want to check In this example we will press the icon on the left Fig 33 home screen 2 The Status Summary page for that controller will appear This shows the current operating condition of that controller and also shows some of the configuration settings See Fig 34 Fig 34 Status Summary Screen Showing Setpoint Information Notice the four buttons at the bottom of each Status Summar...

Page 44: ... of the screen Here are the screens which are included in the loop Burner Control Demand and Modulation Fan DHW Pump Boiler Pump System Pump Flame Detection Statistics Stack Limit CH Frost Protection Lead Lag Slave Lead Lag Master 8 7 Configuring Parameters on Individual Controllers In this section we will just give you a quick explanation of how to change parameters on one of the controllers This...

Page 45: ...except that system would present a numeric entry screen See Fig 41 Fig 41 Numeric Entry Screen 8 8 Verification Process for Safety Related Parameters 1 When you start to change a parameter that is related to safety the system will present a warning which looks like this Fig 42 Parameter Safety Warning Press OK to continue The system will ask you to login before you make a change For more informati...

Page 46: ...nt of the boiler and slide out the control panel before beginning the verification Fig 44 Reset Button on Controller 3 Don t press the Reset button yet We just want to show you where the Reset button is located Change the parameter s you want to change 4 When you are done entering parameters the next job is to do the verification Login to the system and press Begin Fig 45 Edit Safety Data 5 Once y...

Page 47: ...rs and Water Heaters Page 43 Fig 47 Safety Parameter Reset 7 The Reset button is located on the front of the controller See Fig 44 You must press the Reset button within 30 seconds or the verification will be cancelled ...

Page 48: ...iler installation each individual boiler is still set up as shown in Fig 48 The boiler controls are arranged in a daisy chain using a Modbus connection with the Secondary control of one boiler connected to the Primary control of the next boiler Up to four boilers with up to eight controllers can be connected in this way See Fig 49 Fig 48 Lead Lag Arrangement in a Single Boiler Installation Fig 49 ...

Page 49: ... that the Primary burner on a particular boiler may start first one time and the Secondary burner for that boiler may start first the next time When the Run sequence is initiated the burner with the least amount of runtime will fire If the heating demand increases so that the firing rate of that first burner rises to 65 fan speed the Base Load value the next burner in the sequence will start up an...

Page 50: ... the connection terminals on the circuit board inside the cabinet WARNING Before connecting or disconnecting any wiring inside a boiler be absolutely sure to turn off all electrical power to the unit Failure to do this could result in property damage serious injury or death 9 3 NeoTherm LC System Configurations NeoTherm LC s can be installed in many different arrangements The steps in the installa...

Page 51: ...NeoTherm LC Boilers and Water Heaters Page 47 Fig 51 Connection Terminals ...

Page 52: ...e boiler Local Yes No No Yes 7 Single boiler System No No No No 8 Single boiler System No No No Yes from system 9 Multiple boiler System No No No No 10 Multiple boiler System No No No Yes from system 11 Single boiler System No Yes No No 12 Single boiler System No Yes No Yes from system 13 Multiple boiler System No Yes No No 14 Multiple boiler System No Yes No Yes from system System Multiple or sin...

Page 53: ...cal control Outdoor reset Job I Set the parameters used by the Lead Lag system Job J Install the System sensor and adjust the setpoint Job K Lead Lag outdoor reset and warm weather shutdown Job O Set up the combustion on each of the burners Job P Set the date and time on the system System 3 Multiple boilers Local control Job B Set up the names for each of the controllers Job C Make one control the...

Page 54: ...d Lag Master Job E Set up the Modbus control addressing to assign addresses for each of the controls Job F Set up the addresses for the flap valves Job G Disconnect the Touch Screens that will not be used Job H Connect the Modbus wiring Job I Set the parameters used by the Lead Lag system Job J Install the System sensor and adjust the setpoint Job O Set up the combustion on each of the burners Job...

Page 55: ...dresses for each of the controls Job F Set up the addresses for the flap valves Job G Disconnect the Touch Screens that will not be used Job H Connect the Modbus wiring Job I Set the parameters used by the Lead Lag system Job L Building automation or multiple boiler control thermostat demand Job O Set up the combustion on each of the burners Job P Set the date and time on the system System 10 Mult...

Page 56: ...controls Job F Set up the addresses for the flap valves Job G Disconnect the Touch Screens that will not be used Job H Connect the Modbus wiring Job I Set the parameters used by the Lead Lag system Job L Building automation or multiple boiler control thermostat demand Job M Building automation or multiple boiler control 4 20 mA setpoint control Job O Set up the combustion on each of the burners Jo...

Page 57: ...em 18 Multiple boiler System control 4 20 mA modulation control Outdoor reset Job N Building automation or multiple boiler control 4 20 mA modulation control Job O Set up the combustion on each of the burners Job P Set the date and time on the system System 19 Multiple boiler System control Common vent 4 20 mA setpoint control Job A Note on common venting Job B Set up the names for each of the con...

Page 58: ...slave disable the Lead Lag Master Job E Set up the Modbus control addressing to assign addresses for each of the controls Job F Set up the addresses for the flap valves Job G Disconnect the Touch Screens that will not be used Job H Connect the Modbus wiring Job I Set the parameters used by the Lead Lag system Job N Building automation or multiple boiler control 4 20 mA modulation control Job O Set...

Page 59: ...uch Screen on each boiler Each boiler includes two separate controls as shown in Fig 48 In a system with four boilers there will be eight separate controls See Fig 49 The first job is to name each of these controllers 1 We will start by entering a name for the first controller in the line the Primary controller on Boiler 1 Start at the Home screen Press the icon for the Primary control Fig 52 home...

Page 60: ...d they all operate together as part of the Lead Lag system There is only one Lead Lag Master in the system Usually the controller used for this is the Primary controller on Boiler 1 Other controls in the system can be set as the Lead Lag Master but we do not recommend this because it may complicate troubleshooting and technical support questions The controller used as the Lead Lag Master will also...

Page 61: ... start with the Secondary controller for Boiler 1 and make sure this is not set up as a Master Fig 59 home screen 2 The system will take you to the Status Summary screen Fig 60 Status Summary Screen 3 To disable the Master function on this controller press the Configure button Figure 61 shows the Configuration screen Fig 61 Configuration Screen 4 Scroll down through the list until you find the lin...

Page 62: ...the first boiler See Fig 63 Fig 63 home screen 4 Press the Setup button in the lower right hand corner to go to the Setup screen Fig 64 Setup Screen 5 Press the Control Setup button Figure 65 shows the Control Setup screen Fig 65 Control Setup Screen 6 The first number on each line 01 02 etc is the Modbus control address Let s set up the Modbus address for the first controller in the line the Prim...

Page 63: ...p valve See Fig 67 A flap valve acts like a one way valve or check valve If one burner in a boiler is operating and the other is not one of the flap valves will close to prevent exhaust air from moving backwards through the burner that is not operating Before the Lead Lag Master controller will allow the system to operate it must be able to determine whether each of these flap valves is open or cl...

Page 64: ...u want to work with The system will take you to the Status Summary screen for that controller Fig 69 Status Summary Screen 3 Press the Configure button Figure 70 shows the Configuration screen Fig 70 Configuration Screen 4 Scroll through the listing on the Configure menu to Flap Valve Configuration and select that line See Fig 71 Fig 71 Flap Valve Configuration Screen Two of the items on this scre...

Page 65: ...red for each of the boilers In this example we are still working with the Primary control for Boiler 1 From the table you can see that this control should have a flap valve ID of 1 Enter the correct ID from Table 5 in this field WARNING If the controller cannot find a signal from one of the flap valves the control system will act to prevent backflow by energizing the blower of the control with the...

Page 66: ... Press Yes if all of the parameters in the group have been entered correctly 12 The system will tell you to reset the control system Fig 77 Safety Parameter Reset You must press the Reset button within 30 seconds or the verification will be cancelled 13 At this point you have set the flap valve address for one of the controllers in the boiler The next job is to set the flap valve identification fo...

Page 67: ...an Unused Touch Screen 4 Close the front door and turn on power to the boiler Job H Connect the Modbus Wiring This is an individual function do this on each of the controls In an installation with multiple boilers the controllers are arranged in a daisy chain The wiring from the Secondary controller on one boiler TB9 pins 7 through 12 to the Primary controller on the next boiler TB9 pins 1 through...

Page 68: ... usually the Primary controller on Boiler 1 We have already explained how the Lead Lag Master controls the operation of the Lead Lag system Your job at this point is to enter the control values that the Lead Lag system will use Fig 80 home screen 1 From the home screen Fig 80 press the Lead Lag Master button Figure 81 shows the screen that follows Fig 81 Lead Lag Master Screen 2 Press the Configur...

Page 69: ... minus an additional hysteresis value P I D Gain These control the damping used by the temperature control The three control values are P proportional I integral and D derivative If you understand how these variables affect the function of the unit you can change them to adjust for unusual operating conditions The default settings for the Lead Lag configuration are P 30 I 20 and D 0 6 Press the le...

Page 70: ... sets how long the DHW loop will have priority before returning to control by the Lead Lag Central Heat setpoint DHW has priority over CH Choose Central Heating priority or Domestic Hot Water priority 8 Press the left arrow or right arrow until you see the Outdoor Reset screen Fig 86 Fig 86 Outdoor Reset Outdoor Reset allows the system to adjust the Central Heat setpoint to compensate for changes ...

Page 71: ...r Shutdown When enabled the Warm Weather Shutdown feature will turn off the Central Heating functions when the outdoor temperature exceeds the setpoint This prevents the system from running when there is no need for heat Enable These options determine how quickly the system shuts down after the outdoor temperature rises above the setpoint The options are Shutdown immediately After demand ends Disa...

Page 72: ...tion shown in Fig 91 Connect the System sensor to the System terminals on the controller acting as the Lead Lag Master usually the Primary controller on Boiler 1 Use terminals 3 and 4 on TB6 2 Adjust the Lead Lag Central Heat Setpoint to the desired temperature to be used by the system How to get there Adjust CH Setpoint Home Page Press View Lead Lag button Lead Lag Screen Press Lead Lag Master bu...

Page 73: ...orrection for the Lead Lag setpoint depending on the outdoor temperature This allows the system to adjust for changes in the outdoor temperature and run more efficiently The Show Line button at the bottom of the Outdoor Reset screen displays a curve which shows how the system will behave at different outdoor temperatures See Fig 94 Fig 94 Show Line Screen The display shown above show the action of...

Page 74: ... temperature setting This is located on the main Lead Lag Configuration screen How to get there Lead Lag Master Configuration Screen Home Page Press Lead Lag Master button Lead Lag Screen Press Configure button Lead Lag Master Configuration Screen Job L Building Automation or Multiple Boiler Control Thermostat Demand This is a Lead Lag function do this once for the whole Lead Lag system Make the c...

Page 75: ...nd 8 on TB7 3 Enable a central heat call for each control on the system This function must be set up for each controller separately This function operates outside of the Lead Lag system How to get there Central Heat Enable Home Page Press the icon for one of the controllers NeoTherm LC Primary Screen Press Configure button Primary Configuration Menu Select line CH Central Heat Configuration 4 Fig ...

Page 76: ... controller Secondary burner Operator interface Boiler 1 Fig 97 Primary and Secondary Burners in a Boiler Fig 98 High and Low Fire Adjustments on Gas Valve NT 1000 High fire adjustment Low fire adjustment Fig 99 High and Low Fire Adjustments on Gas Valve NT 1700 High fire adjustment Low fire adjustment Note If you are setting up an NT 1700 unit for high altitude operation you must change the low f...

Page 77: ...ss the Burner Enable switch in the upper left hand corner of the screen Since you selected the Secondary control for this boiler this will turn off the Secondary burner The system will ask you to log in as you do this 6 Now you can work with the Primary burner for this boiler Press the Home icon to go back to the home screen on the display Fig 100 Press the icon for the control labeled Primary 7 T...

Page 78: ...anual in Run control will only set the fan speed when the control has proven flame and the unit has entered the Run mode Manual in Run and Standby Using this setting the manual control will set the fan speed whether the boiler is operating or not For this test select Manual in Run 13 Type in a value for high fire RPM Enter 8000 RPM The actual RPM will not go this high the control will limit the fa...

Page 79: ...able button On the home screen press the icon for the Secondary controller On the Status Summary screen press the Operation button On the Operation screen for the Secondary burner press the yellow box for the Firing Rate Login using the installer level password then press OK Now you can change the Firing Rate entry for the Secondary burner Enter 8000 RPM for the High Fire value Adjust the High Fir...

Page 80: ... gauge and plug the ports Repeat the test setup on each burner Job P Setting the Date and Time on the System Display This is a Lead Lag function do this once for the whole Lead Lag system Use the controller set up as the Lead Lag Master usually the Primary controller on Boiler 1 The display acting as the Lead Lag Master includes an internal clock which keeps track of the date and time This setting...

Page 81: ... the DHW demand The DHW pump will start circulating water through the loop in the indirect water heater The System sensor is used to control modulation in this configuration so sensor placement is critical This arrangement can be cumbersome if the demand for domestic hot water is a lot less than the demand for central heating This can result in multiple boilers idling as they wait for the DHW dema...

Page 82: ... be jumpered from the Primary control in each boiler terminals 5 and 6 on TB6 to terminals 7 and 8 on TB6 The LL CH setpoint used by all of the boilers is set in the normal way working from the Lead Lag section of the software On each of the boilers used for DHW priority is given to the DHW function Because this affects individual boilers rather than the whole system this part of the setup is done...

Page 83: ...ate this way connect a DHW sensor or the input from the aquastat to terminals 5 and 6 on TB6 Be sure there is no thermostat connected check terminals 5 and 6 on TB7 The two burners in each boiler will operate in the Lead Lag mode You can think of each boiler as a separate two burner Lead Lag system The setpoint used is the LL DHW setpoint set as part of the Lead Lag system In the Lead Lag setup DH...

Page 84: ...2 tab to bring up the setup screen for the COM2 function Click the box labeled Enable COM2 Port See Fig 121 9 7 Setup for High Altitude Operation NT 1700 Only This is an individual function do this for each of the controls Use the separate Touch Screen on each boiler When setting up a NT 1700 unit in a high altitude environment a low fire adjustment must be made The Minimum Modulation rate RPM mus...

Page 85: ...troller Status Summary screen Configure button Configuration Menu Select Statistics Configuration line Boiler Name This parameter allows the installer to give each controller a unique name home screen Select a controller Status Summary screen Configuration button Configuration Menu System ID and Access Burner Cycle Count This is incremented on each entry to Run It can be written to a with a new va...

Page 86: ... screen Configure button Lead Lag Master Configuration screen Advanced Settings button Left or Right arrow buttons Outdoor Reset screen CH Central Heat Off Hysteresis The off hysteresis is added to the CH setpoint to determine the temperature at which the burner demand turns off home screen Select controller Status Summary screen Configuration button Central Heat Configuration Arrow keys Modulatio...

Page 87: ...t Water vs Central Heat call for heat when both of these are enabled and active The DHW priority also may shift for a period of time as specified by DHW Priority time and method parameters home screen Lead Lag Master Lead Lag Master screen Configure button Lead Lag Master Configuration screen Advanced Settings button Left and Right arrow buttons Domestic Hot Water screen DHW Domestic Hot Water I g...

Page 88: ...n Flap valve controller ID Each flap valve has a unique ID number On a system with 4 boilers there would be 8 flap valves numbered 1 through 8 home screen Select a controller Status Summary screen Configurate button Flap Valve Configuration screen Lead lag CH outdoor reset enable This line is used to turn on the Outdoor Reset function when the Lead Lag system is enabled If Lead Lag enabled home sc...

Page 89: ...int used for Domestic Hot Water when the Lead Lag system is enabled home screen Lead Lag Master button Lead Lag Master screen Configure button Lead Lag Master Configuration screen Lead lag DHW TOD setpoint This is a different setpoint used for Domestic Hot Water when the Lead Lag system is enabled and the input from the Time Of Day switch is true home screen Lead Lag Master button Lead Lag Master ...

Page 90: ...unique Modbus address Be sure to enter this for each controller in the system home screen Select a controller Status Summary screen Configure button Configuration Menu Select line for LL Slave Configuration Lead Lag Slave Configuration screen Lead Lag Outdoor Reset Enable Enable Outdoor Reset feature turned on home screen Lead Lag Master button Lead Lag Master screen Configure button Lead Lag Mast...

Page 91: ...s replaced home screen Select a controller Status Summary screen Configure button Configuration Menu Select Statistics Configuration Temperature units This parameter determines whether temperature is represented in units of Fahrenheit or Celsius degrees home screen Select a controller Status Summary screen Configure button Configuration Menu Select System Configuration Lead Lag Warm Weather Shutdo...

Page 92: ...nd any gas control that may have been under water Section 10 INITIAL STARTUP INSTRUCTIONS 10 1 Filling the Boiler System 1 Ensure the system is fully connected Close all bleeding devices and open the make up water valve Allow the system to fill slowly 2 If a make up water pump is employed adjust the pressure switch on pumping system to provide a minimum of 12 psi 81 8 kPa at the highest point in t...

Page 93: ...tial Operation The initial setup must be checked before the unit is put into operation Problems such as failure to start rough ignition strong exhaust odors etc can be due to improper setup Damage to the boiler resulting from improper setup is not covered by the limited warranty 10 2 1 Initial Burner Operation 1 Using this manual make sure the installation is complete and in full compliance with t...

Page 94: ...pliance control f Flow switch b Automatic gas valve g Low water cutoff c Pressure switches h Burner d Blower i Heat exchanger e Pump Do the following once every six months 1 If a strainer is employed in a pressure reducing valve or the piping clean it every six months 11 2 Maintenance Notes Use only genuine LAARS replacement parts Caution When servicing the controls label all wires before disconne...

Page 95: ...ground rod and a sense rod To remove the ignitor assembly shut off the 120 Volt power supply to the unit Turn off all manual gas valves connecting the unit to the main gas supply line Remove the front door of the boiler to gain access to the ignitor assembly Remove the two wires connected to the assembly Then remove the two bolts connecting the ignitor assembly to the burner door Remove and replac...

Page 96: ...e nuts located on the outside diameter of the burner door to the heat exchanger 4 Remove the burner door burner assembly from the heat exchanger 5 Disconnect the condensate drain line 6 Attach a longer hose to the drain and run it to a bucket 7 Clean the heat exchanger by brushing away any light accumulations of soot and debris Use a non metallic brush with soft bristles to avoid damaging the surf...

Page 97: ...e installed to prevent the accumulation of condensate When a condensate pump is not used the tubing must continuously slope downward toward the drain with no spiraling Consult local codes for the disposal method Caution Condensate is mildly acidic pH 5 and may harm some floor drains and or pipes particularly those that are metal Ensure that the drain drainpipe and anything that will come in contac...

Page 98: ...rangement in a Multiple Boiler Installation 12 1 1 Controller Synchronization On a multiple boiler installation the individual boiler controllers are arranged in a daisy chain using a Modbus connection with the Secondary control of one boiler connected to the Primary control of the next boiler Up to four boilers with up to eight controllers can be connected in this way See Fig 122 As part of the s...

Page 99: ... safety related parameter but do not finish the verification process For more information on verification see Section 8 8 Primary burner Primary controller Flap valve Flap valve Secondary controller Secondary burner Operator interface Boiler 1 Fig 123 Flap Valve Arrangement During a lockout condition the image of the affected controller on the home screen will appear in red A bell symbol will appe...

Page 100: ... 12 2 2 Viewing the Lockout and Alert Histories 1 To view the Lockout history start at the home screen Fig 124 Fig 124 home screen 2 Press the Lead Lag Master button Figure 125 shows the Lead Lag Master screen Fig 125 Lead Lag Master Screen 3 If you press the Details button the control software will present a screen similar to this Fig 126 Fig 126 Typical Details Screen 4 To see a record of the re...

Page 101: ...NeoTherm LC Boilers and Water Heaters Page 97 Fig 128 Alert Log Screen To get more information on a particular alert touch the entry for that alert on the screen ...

Page 102: ...de and safety parameters need verification and a device needs reset to complete verification 2 Configuration ended without verification re enter configuration verify safety parameters and reset device to complete verification 3 If fault repeats replace module 3 Internal fault Hardware fault H Internal fault 1 Reset module 2 If fault repeats replace module 4 Internal fault Safety Relay key feedback...

Page 103: ...set module 2 If fault repeats replace module 18 Internal fault Safety relay test failed due to feedback not ON L Internal fault 1 Reset module 2 If fault repeats replace module 19 Internal fault Safety RAM write L Internal fault 1 Reset module 2 If fault repeats replace module 20 Internal fault Internal fault Flame ripple and overflow H Internal fault 1 Reset module 2 If fault repeats replace modu...

Page 104: ...al fault 1 Reset module 2 If fault repeats replace module 32 46 Internal fault Safety Key 0 through 14 L Internal fault 1 Reset module 2 If fault repeats replace module 47 Flame Rod to ground leakage H Internal fault 1 Reset module 2 If fault repeats replace module 48 Static flame not flickering H Internal fault 1 Reset module 2 If fault repeats replace module 49 24 VAC voltage low high H 1 Check ...

Page 105: ...L 1 Check wiring and correct any faults 2 Check Preignition Interlock switches to assure proper functioning 3 Check the valve operation 4 Reset and sequence the module monitor the PII status 5 If code persists replace the module 67 ILK Interlock OFF H or L 1 Check wiring and correct any possible shorts 2 Check Interlock ILK switches to assure proper function 3 Verify voltage through the interlock ...

Page 106: ...Inlet sensor fault H 1 Check wiring and correct any possible errors 2 Replace the Inlet sensor 3 If previous steps are correct and fault persists replace the module 92 Outlet sensor fault H 1 Check wiring and correct any possible errors 2 Replace the Outlet sensor 3 If previous steps are correct and fault persists replace the module 93 DHW Domestic Hot Water sensor fault H 1 Check wiring and corre...

Page 107: ... chamber Correct any errors 2 Make sure that the flame detector is wired to the correct terminal 3 Make sure the F G wires are protected from stray noise pickup 4 Reset and sequence the module if code reappears replace the flame detector 5 Reset and sequence the module if code reappears replace the module 106 Flame lost in MFEP L 1 Check main valve wiring and operation correct any errors 2 Check t...

Page 108: ...e test Not a lockout 111 Flame current lower than weak threshold H Hold time of recycle and hold option Will not be a lockout fault Hold Only Internal hardware test Not a lockout 113 Flame circuit timeout L Flame sensed during Initiate or off cycle hold 240 seconds if present after 240 seconds system will lockout 119 Control Interaction Fault H Flap valve identifications configured incorrectly 122...

Page 109: ...the VFDs Variable speed Fan Drive ability to change speeds 3 Change the VFD 4 If the fault persists replace the module 137 ILK Interlock failed to close H 1 Check wiring and correct any possible shorts 2 Check Interlock ILK switches to assure proper function 3 Verify voltage through the interlock string to the interlock input with a voltmeter 4 If steps 1 3 are correct and the fault persists repla...

Page 110: ...ace the module 157 Combustion pressure and flame OFF L 1 Check that flame is not present in the combustion chamber Correct any errors 2 Make sure that the flame detector is wired to the correct terminal 3 Make sure the F G wires are protected from stray noise pickup 4 Reset and sequence the module if code reappears replace the flame detector 5 Reset and sequence the module if code reappears replac...

Page 111: ...Reset module 2 If fault repeats replace module 174 Safety relay feedback incorrect L Internal Fault 1 Reset module 2 If fault repeats replace module 175 Safety relay open L Internal Fault 1 Reset module 2 If fault repeats replace module 176 Main relay ON at safe start check L Internal Fault 1 Reset Module 2 If fault repeats replace module 178 Safety relay ON at safe start check L Internal Fault 1 ...

Page 112: ...ing 3 If fault repeats replace module 194 Invalid ignite failure response setting L 1 Return to Configuration mode and recheck selected parameters reverify and reset module 2 If fault repeats verify electrical grounding 3 If fault repeats replace module 195 Invalid ignite failure retries setting L 1 Return to Configuration mode and recheck selected parameters reverify and reset module 2 If fault r...

Page 113: ...y electrical grounding 3 If fault repeats replace module 205 Invalid Outlet high limit response setting L 1 Return to Configuration mode and recheck selected parameters reverify and reset module 2 If fault repeats verify electrical grounding 3 If fault repeats replace module 207 Invalid PII Pre Ignition Interlock enable setting L 1 Return to Configuration mode and recheck selected parameters rever...

Page 114: ...alid Stack limit response setting L 1 Return to Configuration mode and recheck selected parameters reverify and reset module 2 If fault repeats verify electrical grounding 3 If fault repeats replace module 220 Unconfigured Delta T limit setpoint setting L 1 Return to Configuration mode and recheck selected parameters reverify and reset module 2 If fault repeats verify electrical grounding 3 If fau...

Page 115: ...ding 3 If fault repeats replace module 230 Invalid CH Central Heat demand source setting L 1 Return to Configuration mode and recheck selected parameters reverify and reset module 2 If fault repeats verify electrical grounding 3 If fault repeats replace module 231 Invalid Delta T limit delay setting L 1 Return to Configuration mode and recheck selected parameters reverify and reset module 2 If fau...

Page 116: ...e and recheck selected parameters reverify and reset module 2 If fault repeats verify electrical grounding 3 If fault repeats replace module 239 Invalid Header connector type setting L 1 Return to Configuration mode and recheck selected parameters reverify and reset module 2 If fault repeats verify electrical grounding 3 If fault repeats replace module 240 Invalid Outdoor connector type setting L ...

Page 117: ...rner Control I O button leads to Fig 129 Fig 129 Burner Control I O Screen A green dot indicates a function that is on 2 Press the Digital I O button to look at functions where the functions are either on of off See Fig 130 Fig 130 Digital I O Screen 3 The button for Analog I O displays items that change continuously between two limits See Fig 131 Fig 131 Analog I O Screen 4 Press the button for D...

Page 118: ...en Configure button Configuration Menu Select Statistics Configuration line Statistics Configuration Screen Fig 135 Statistics Configuration Screen 12 7 Analysis The control system includes an Analysis branch that can display the behavior over a period of time for several different parameters fan speed outlet temperature inlet temperature etc How to get there Home Page Select icon Status Summary S...

Page 119: ...lays The Initiation sequence also delays the boiler demand from being energized and re energized from an intermittent AC line input or control input If an AC problem exists for more than 240 seconds a lockout will occur Start Up Checks in a Lead Lag System For an explanation of Lead Lag operation see the first part of Section 9 In this section we will focus on the aspects of Lead Lag that might be...

Page 120: ...nt plus the Lead Lag Central Heat Off Hysteresis value approx 10 F 12 At the end of the Lead Lag Central Heat request the burner is switched off The fan stays on until Post Purge is complete 13 Any new Lead Lag Central Heat request is blocked for the Anti Short Cycle time 14 The Boiler pump and System pump remain on during their pump overrun times 15 At the end of the pump overrun times the Boiler...

Page 121: ... or Low Fire Switch is not reached within four minutes and fifteen seconds after the blower is commanded to drive to the light off rate fan RPM at the end of Prepurge Locks out if the Main Valve terminal is energized Locks out if an internal system fault occurs During the Pre Ignition Time All of the checks made under Synchronization plus Locks out if the Main Valve terminal is energized During th...

Page 122: ... BRACKET PIPE 11 10J7006 BRACKET MOUNTING SLIDE TOP 12 10J1270 BRACKET ANGLE STIFFENING CONTROL MOUNT 13 10J7013 BRACKET MOUNTING SIDE BOTTOM 14 10J1204 CROSS BRACE HX BASE 15 10J1205 SUPPORT 16 10J1207 BRACKET LIFT NT 1 0 17 10J1203 CHANNEL BASE 18 10J1206 RAIL HX 19 10J1238 BRACKET LEVELING HEX 20 F2031500 MOUNT LEVELING HEX 1 2 13 THD X 2 11 16 LG 21 10J1210 WELDMENT BASE 22 10J1246 BRACKET ANT...

Page 123: ...L 58 17J3025 COVER ACCESS FIELD CONNECTIONS 59 S2008000 GASKET CLOSED CELL 75 X 06 X 4 5 CUT LG 60 17J3030 GASKET HX OUTLET NT 1 7 61 17J3031 PLATE RETAINER GASKET 62 17J2520 PLATE ASSY CONNECTION INLET 63 S2117200 GROMMET 2 1 2 PIPE FLEX 64 S2116500 GROMMET 2 PIPE FLEX 65 F0035900 SCREW PHIL PAN HD 6 32 X 5 8 LG 66 E2350300 ELECTRICAL CONNECTOR 67 E2348300 OUTLET BOX DUAL RECEPTACLE 68 10J1265 10...

Page 124: ...4MM THICK X 110MM ID 94 RA2113100 BLOWER COMBUSTION AIR 100 S2116800 GASKET FAN FLANGE 101 P0026800 PLUG PIPE BRASS 1 4 NPT P2080300 PLUG PIPE STAINLESS STEEL 1 4 NPT 102 P0071500 PLUG 3 4 STEEL P2080200 PLUG 3 4 STAINLESS STEEL 103 RE2319900 RE2319900 SENSOR TEMPERATURE WATER DUPLEX 104 R1 592 R1 592 COIN VENT VALVE 105 F2029100 TIE CABLE 14 3 4 LONG X 0 31 WIDE HEAT STABILIZED 106 S2117801 HEAT ...

Page 125: ...0384800 VALVE GAS MANUAL BALL TYPE 1 1 2 NPT 135 F2026400 SCREW M4 X 30MM CHEESE HD 136 P2014200 PLUG HD 1 4 NPT SQ SOCKET BLK 137 R10J5150 TRANSITION ASSEMBLY VENTURI W PARTS V2018600 ADAPTER 4MM HOSE BARB X M5 8 W WASHER Q0068441 1 4 TUBE PRESSURE SENSING NT 6 26 LONG P2081000 COUPLING NO HUB SHIELDED 2 P0004101 FITTING 1 4 COMP X 1 4 NPT DRILLED OUT 10J5153 ELBOW ASSY VENTURI TRANSITION 139 S21...

Page 126: ...0 RF2012800 SCREW M5 0 8 X 16 MM SOC HD 186 S2117100 S2117100 GASKET BURNER 187 R2071700 RL20202 BURNER W GASKET 188 R2071500 R2071500 IGNITOR SPARK W GASKET 189 RW2013300 RW2013300 GASKET IGNITOR 190 S2112600 S2112600 FLANGE NUT M6 SERRATED 191 RS2114200 RS2114200 ASSEMBLY DOOR HEAT EXCHANGER 192 T2110600 T2110600 TILE REFRACTORY FRONT COMBUSTION CHAMBER 193 T2110700 T2110700 TILE REFRACTORY REAR...

Page 127: ...DENSATE TRAP 213 A2119700 A2119700 TRAP CONDENSATE 214 10J126900 10J126900 BRACKET MOUNTING TRAP 215 P2073200 P2073200 COUPLING 3 4 TO 1 2 REDUCING PVC 216 P2067701 PIPE PVC 1 2 X 1 49 LONG SCH 40 217 10J1237 BRACKET HOSE TRAP 218 A2119400 A2119400 SPHERE 1 00 DIA 219 P2082201 TUBING PVC CLEAR FLEX 3 4 I D X 1 O D X 1 8 WALL 220 P2067604 PIPE PVC 3 4 SCH 40 x 37 5 LG 221 P2083900 PIPE PVC 3 4 SCH ...

Page 128: ...LAARS Heating Systems Page 124 Fig 140 Machine Frame NT1000 13 3 Parts Illustrations ...

Page 129: ...NeoTherm LC Boilers and Water Heaters Page 125 Fig 141 Rear Panel NT1000 Fig 142 Rear Panel NT1700 ...

Page 130: ...LAARS Heating Systems Page 126 Fig 143 Machine Frame NT1700 ...

Page 131: ...NeoTherm LC Boilers and Water Heaters Page 127 Fig 144 Front Panels and Covers NT1000 and NT1700 ...

Page 132: ...LAARS Heating Systems Page 128 Fig 145 Burners and Combustion Chamber NT1000 ...

Page 133: ...NeoTherm LC Boilers and Water Heaters Page 129 Fig 146 Burners and Combustion Chamber NT1700 ...

Page 134: ...LAARS Heating Systems Page 130 Fig 147 Heat Exchanger Components NT1000 and NT1700 Fig 148 Burner Detail NT1000 ...

Page 135: ...NeoTherm LC Boilers and Water Heaters Page 131 Fig 149 Burner Detail NT1700 ...

Page 136: ...LAARS Heating Systems Page 132 Fig 150 Electronic Components Fig 151 Condensate Trap NT1000 ...

Page 137: ...NeoTherm LC Boilers and Water Heaters Page 133 Fig 152 Condensate Trap NT1700 Fig 153 Flow Switch NT1000 and NT1700 ...

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Page 139: ...NeoTherm LC Boilers and Water Heaters Page 135 This page intentionally left blank ...

Page 140: ...7 603 335 6300 Fax 603 335 3355 1869 Sismet Road Mississauga Ontario Canada L4W 1W8 905 238 0100 Fax 905 366 0130 www Laars com Printed in U S A Laars Heating Systems 1308 Document 1255B Dimensions and specifications subject to change without notice in accordance with our policy of continuous product improvement ...

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