Laars NTV1000 Installation And Operation Instructions Manual Download

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Installation and Operation Instructions

Document 1247

H2344800

WARNING

If the information in this manual is not

followed exactly, a fire or explosion may

result causing property damage, personal

injury or loss of life.

Do not store or use gasoline or other

flammable vapors and liquids in the vicinity

of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not

use any phone in your building.

• Immediately call your gas supplier from a

nearby phone. Follow the gas supplier’s

instructions.

• If you cannot reach your gas supplier, call

the fire department.

Installation and service must be performed

by a qualified installer, service agency, or gas

supplier.

FOR YOUR SAFETY:

This product must be installed and serviced by a professional service technician,

qualified in hot water boiler and heater installation and maintenance. Improper installation and/or operation

could create carbon monoxide gas in flue gases 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 liquides inflammables dans

le voisinage de cet appareil ou de tout autre

appareil.

QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:

• Ne pas tenter d’allumer d’appareils.

• Ne touchez à aucun interrupteur. Ne pas vous

servir des téléphones dansle bâtiment où vous

vous trouvez.

• Appelez immédiatement votre fournisseur de

gaz depuis un voisin. Suivez les instructions

du fournisseur.

• Si vous ne pouvez rejoindre le fournisseur de

gaz, appelez le sservice des incendies.

L’installation et l’entretien doivent être assurés par

un installateur ou un service d’entretien qualifié ou

par le fournisseur de gaz.

Installation and Operation
Instructions for

NeoTherm

Modulating Boiler
Model NTH1000

1,000 MBTU/h

Water Heater
Model NTV1000

1,000 MBTU/h

Summary of Contents for NTV1000

Page 1: ...arbon monoxide gas in flue gases 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...

Page 2: ......

Page 3: ...ead Requirements 17 5 2 NeoTherm Water Heater Flow and Head Requirements 17 Section 6 Water Connections 18 Section 6A NTH Units 18 6A 1 NTH System Piping Hot Supply Connections 18 6A 2 NTH Cold Water...

Page 4: ...r Domestic Hot Water on a Lead Lag System 81 Setup Type 1 81 Setup Type 2 82 Setup Type 3 83 9 6 Installer Parameters 85 Section 10 Operating Instructions 92 10 1 Filling the Boiler System 92 10 2 Ini...

Page 5: ...ave made a special effort to show you how to reach each of the important setup and operating functions We have done this in two ways In many cases we have shown you the actual screen display you will...

Page 6: ...a name and this can be changed The Home screen on the Operator Interface will show icons for each of the controller burner pairs connected to the system To reach one of the functions for an individua...

Page 7: ...t of the burners may lead to poor combustion quality increasing the amount of carbon monoxide produced Excessive carbon monoxide levels may lead to personal injury or death WARNING Electrical Shock Ha...

Page 8: ...sts are not included in the warranty coverage Some accessory items may be shipped in separate packages Verify receipt of all packages listed on the packing slip Inspect everything for damage immediate...

Page 9: ...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...

Page 10: ...t an appropriate 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 Locating...

Page 11: ...Code CSA B149 1 All applicable provisions of local building codes must also be adhered to A NeoTherm unit can take combustion air from the space in which it is installed or the combustion air can be d...

Page 12: ...ust be sized per Table 2 Route the intake to the boiler as directly as possible Seal all joints Provide adequate hangers The unit must not support the weight of the combustion air intake pipe The maxi...

Page 13: ...ents 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 insta...

Page 14: ...connection of the NeoTherm unit within 2 feet of the flue connection There is no flue gas sampling port internal to the NeoTherm so one must be installed in the vent system external to the NeoTherm un...

Page 15: ...ote 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 ap...

Page 16: ...see Figures 9 and 10 for proper spacing and orientation If the vent termination is located in an area exposed to high winds an optional PVC tee the same diameter as the vent pipe may be used The tee...

Page 17: ...ed appliance the installing plumber or gas fitter shall observe that a hard wired carbon monoxide detector with an alarm battery back up is installed on the floor level where the gas appliance is to b...

Page 18: ...ion the appliance being inspected Follow the lighting instructions Adjust the thermostat so the appliance will operate continuously 5 Test for spillage at the draft hood relief opening after five minu...

Page 19: ...ts 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...

Page 20: ...FEET 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 NATURAL GAS REQUIRED CU FT SIZE HR 1000 1000 To size piping Measure linear distance from met...

Page 21: ...w GPM H L Ft Flow GPM H L Ft Flow GPM H L Ft Flow GPM H L Ft Flow GPM H L Ft Flow GPM H L Ft 95 30 75 20 62 15 54 11 48 9 42 7 Temperature Rise in C 11 0 C 13 7 C 16 5 C 19 3 C 22 0 C 24 7 C Flow LPM...

Page 22: ...te there is a risk of freezing in the boiler or in the pipes in the system When water freezes it expands This may result in bursting of pipes or damage to the boiler and this could result in leaking o...

Page 23: ...s of protection Glycol products must be maintained properly in a heating system or they may become ineffective Consult the glycol specifications or the glycol manufacturer for information about specif...

Page 24: ...ntrols 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 re...

Page 25: ...tank directly off of boiler Air vent 4 pipe dia max Expansion tank Water feed controls 4 pipe dia max Indirect DWH tank Anti scald mixing valve Cold water Domestic hot water out Note This drawing is...

Page 26: ...ler Low temp radiant zone Low temp radiant zone Air vent Water feed controls Expansion tank 4 pipe dia max Indirect DWH tank Anti scald mixing valve Domestic hot water out Cold water Note This drawing...

Page 27: ...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...

Page 28: ...lers High temp space heating zone circuit 4 pipe dia max 4 pipe dia max 4 pipe dia max Indirect DWH tank Note Indirect pump must be sized for boiler and indirect Anti scald mixing valve Domestic hot w...

Page 29: ...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 i...

Page 30: ...One Heater Two Vertical Tanks 6B 5 NTV Suggested Piping Schematics Figures 16 18 show suggested piping configurations for NTV boilers These diagrams are only meant as guides All components or piping r...

Page 31: ...ter may be required check local codes 4 Thermal expansion tank may be required check local codes 5 Caution Pump sizing must be based upon water hardness at job site WARNING This drawing shows suggeste...

Page 32: ...of these components may result The NeoTherm unit 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 will remain in low...

Page 33: ...NeoTherm Boilers and Water Heaters Page 29 Fig 19 Electronics Panel Layout TB5 TB2 TB1 Primary controller upper burner Secondary controller lower burner TB7 TB6 TB4 TB3...

Page 34: ...heat thermostat Outdoor air temperature sensor Aquastat for domestic hot water External control connections 7 5 Optional Field Connections Optional components such as low water cutoffs flow switches a...

Page 35: ...NeoTherm Boilers and Water Heaters Page 31 Fig 20 Ladder Diagram...

Page 36: ...LAARS Heating Systems Page 32 Fig 21 Wiring Diagram...

Page 37: ...NeoTherm Boilers and Water Heaters Page 33...

Page 38: ...nterface to get input from the operator or installer and to present information about the operation of the boiler Each boiler includes a touchscreen but in a typical installation only the touchscreen...

Page 39: ...the system Home Upper 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 par...

Page 40: ...operation of all of the boilers connected to the system and some system components For a complete explanation of Lead Lag see the beginning of Section 9 In this section we will explain how to check t...

Page 41: ...tton the control software leads you to a ring of screens that include some information about the way the Lead Lag system is set up The screens in this section are read only you can read the values but...

Page 42: ...label on the left side of the screen and the indicators below show the status of each of the pumps Red off and green on If you press the Question Mark symbol the system will present more information a...

Page 43: ...ystem Pump Flame Detection Statistics Stack Limit DHW Plate Preheat DHW Plate Tap CH Frost Protection Lead Lag Slave Lead Lag Master 8 7 Configuring Parameters on Individual Controllers In this sectio...

Page 44: ...these parameters Let s turn on the Central Heat function On the Configuration Screen Fig 38 scroll down and press the line for CH Central Heat Configuration Figure 39 shows the screen which follows Fi...

Page 45: ...lves See Fig 42 A line printed in red at the bottom of the screen indicates that the system wants to do a safety verification All of the parameters in this group have safety related functions If you c...

Page 46: ...sting for each group of parameters which includes a changed safety parameter See Fig 45 Fig 45 Safety Parameter Confirmation 6 For each group check the list carefully Press Yes if all of the parameter...

Page 47: ...During the cleaning routine the screen is disabled so it will ignore any commands you might send 1 From the Home Page press the Setup button Figure 47 shows the Display Setup screen Fig 47 Display Se...

Page 48: ...multiple boiler installation each individual boiler is still set up as shown in Fig 49 The boiler controls are arranged in a daisy chain using a Modbus connection with the Secondary control of one bo...

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 l...

Page 50: ...r reach 65 all are allowed to go over 65 The Lead Lag controller will change the firing order of the burners based on the run time of each burner 9 1 3 NTH Lead Lag with Indirect Domestic Hot Water So...

Page 51: ...NeoTherm Boilers and Water Heaters Page 47 Fig 52 Connection Terminals...

Page 52: ...es 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...

Page 53: ...ob P Set the date and time on the system System 2 Single boiler Local control Outdoor reset Job I Set the parameters used by the Lead Lag system Job J Install the System sensor and adjust the setpoint...

Page 54: ...g 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 Operator Interfaces that will not b...

Page 55: ...or each of the controls Job F Set up the addresses for the flap valves Job G Disconnect the Operator Interfaces that will not be used Job H Connect the Modbus wiring Job I Set the parameters used by t...

Page 56: ...s Job F Set up the addresses for the flap valves Job G Disconnect the Operator Interfaces that will not be used Job H Connect the Modbus wiring Job I Set the parameters used by the Lead Lag system Job...

Page 57: ...to assign addresses for each of the controls Job F Set up the addresses for the flap valves Job G Disconnect the Operator Interfaces that will not be used Job H Connect the Modbus wiring Job I Set th...

Page 58: ...g 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 Operator Interfaces that will not b...

Page 59: ...e 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 Operator Interfaces that w...

Page 60: ...th Category I appliances Job B Naming the Controllers This is an individual function do this for each of the controls Use the separate Operator Interface on each boiler Each boiler includes two separa...

Page 61: ...l operate as the Primary or Secondary 9 Repeat the process for any other boilers in the system Job C Make One Control the Lead Lag Master This is an individual function do this once for the control th...

Page 62: ...ing to Enable Press the Home button to go back to the Home screen Job D Disable the Lead Lag Master Function on the Lead Lag Slaves This is an individual function do this for each of the controls exce...

Page 63: ...r function on this controller press the Configure button Figure 63 shows the Configuration screen Fig 63 Configuration Screen 4 Scroll down through the list until you find the line for LL Master Confi...

Page 64: ...each controller in each of the boilers On a system with four boilers there will be eight separate controllers You will need to give each of these controllers a unique Modbus address Notice that this...

Page 65: ...fe manner This could lead to property damage personal injury or death 10 Now you can use the same process to set the address for the Secondary control for Boiler 1 On the Modbus System Configuration s...

Page 66: ...needs to know how many controllers are included in the whole system You will need to enter this information in each of the controllers separately WARNING If the flap valve identifications are not conf...

Page 67: ...so you would enter 6 for Number of Controls 5 Because you are changing a parameter that is related to safety the system will present a warning that looks like this Fig 74 Parameter Safety Warning Pre...

Page 68: ...r the control system will not let the boiler operate Press the Back arrow to return to the Configuration screen Fig 75 Configuration Screen 8 In a moment you will need to reset the controller by press...

Page 69: ...be handled from one Operator Interface the one connected to the boiler which includes the Lead Lag Master The other Operator Interfaces will not have any function and should be disconnected from the...

Page 70: ...1 to the Primary controller on Boiler 2 Connect three wires from the Modbus 1 terminal MB1 on J3 on the Secondary control on Boiler 1 to MB1 also MB1 on J3 on the Primary control on Boiler 2 Wire A o...

Page 71: ...Fig 83 Lead Lag Screen 3 To set up the Lead Lag Master function press the button for Lead Lag Master Fig 84 shows the screen that follows Fig 84 Lead Lag Master Screen 4 Press the Configure button Th...

Page 72: ...by pressing one of the left or right arrow symbols The screens in this ring are Modulation Central Heat Domestic Hot Water Outdoor Reset Warm Weather Shutdown Algorithms Rate Allocation 7 Press the l...

Page 73: ...d to adjust the setpoint this entry sets the high limit of the control range In the example shown here an input of 20 mA would result in a setpoint of 120 F 9 Press the left arrow or right arrow until...

Page 74: ...t to 32 F If the outdoor temperature reaches 32 F or below the system will use the normal Lead Lag System setpoint 120 F in this example Low water temp If the outdoor temperature reaches the Max Outdo...

Page 75: ...that point the controller will start the second boiler in the lead lag chain See the explanation at the beginning of this section and Fig 51 Base Load Common As the demand increases this sets the poi...

Page 76: ...4 Mounting Location for System Sensor Job K Set Lead Lag Outdoor Reset and Warm Weather Shutdown This is a Lead Lag function do this once for the whole Lead Lag system Use the controller set up as the...

Page 77: ...t used by the system Without Outdoor Reset this would be a constant 120 F or whatever value you chose regardless of the outdoor temperature The green line in the graph would run straight across the di...

Page 78: ...reen 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...

Page 79: ...nnect to terminals 7 and 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...

Page 80: ...ts the CO2 readings you should see at high fire and low fire 2 To start the setup turn on the call for heat 3 Before you can set up the Primary burner you must shut off the Secondary burner Go to the...

Page 81: ...n for the Primary burner Fig 105 Operation Screen 9 Press the Login button at the bottom of the screen The system will ask you to log in using a password Enter the installer level password then press...

Page 82: ...each condition We will review the process quickly here On the Home screen press the icon for the Secondary controller On the Status Summary screen press the Operation button On the Operation screen p...

Page 83: ...own in Fig 106 When the testing is complete remove the pressure gauge and plug the ports Repeat the test setup on each burner Job P Set Date and Time on System Display This is a Lead Lag function do t...

Page 84: ...stem will present the Display Setup screen Fig 108 Display Setup Screen 3 Press the Advanced Setup button The Advanced Setup screen is shown in Fig 109 Fig 109 Advanced Setup Screen 4 Select Date and...

Page 85: ...ough 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 do...

Page 86: ...s system is more flexible but the setup is a bit more complicated All of the boilers are tied together in the normal way using the Modbus connections The DHW demand must switch over a whole boiler inc...

Page 87: ...Screen 4 Select that line by pressing it If you want to change the DHW priority the system will ask you to log in using the installer level password For this kind of installation the entry should be D...

Page 88: ...Press the Configure button The display will present the Lead Lag Master Configuration Screen Fig 120 Fig 120 Lead Lag Master Configuration Set the DHW setpoint on this screen 5 Press the button for A...

Page 89: ...le Count This is incremented on each entry to Run It can be written to a with a new value if the burner or controller is replaced Home screen Select controller Status Summary screen Configure button C...

Page 90: ...ter button Lead Lag Master 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...

Page 91: ...mary screen Configuration Domestic Hot Water Configuration DHW Domestic Hot Water has priority over CH Central Heat This parameter determines the priority of Domestic Hot Water vs Central Heat call fo...

Page 92: ...D 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 controller Status Summary screen Configuration Flap Valve Confi...

Page 93: ...er button Lead Lag Master screen Configure button Lead Lag Master Configuration screen Advanced Settings button Left or Right arrow buttons Domestic Hot Water screen Lead lag DHW setpoint This is the...

Page 94: ...this is turned on for each controller in the system Home screen Select controller Status Summary screen Configuration button Configuration screen Select line for LL Slave Configuration Lead Lag Slave...

Page 95: ...luded in the whole system On a system with 4 boilers there would be a total of 8 flap valves Home screen Select controller Status Summary screen Configuration Flap Valve Configuration Outdoor temperat...

Page 96: ...and any gas control that may have been under water Section 10 Operating Instructions 10 1 Filling the Boiler System 1 Ensure the system is fully connected Close all bleeding devices and open the make...

Page 97: ...al 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 th...

Page 98: ...iance 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...

Page 99: ...ound 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 d...

Page 100: ...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...

Page 101: ...Conversion NeoTherm units can easily be converted from natural to propane gas or from propane to natural gas If a gas conversion is performed the unit must be identified with the appropriate gas labe...

Page 102: ...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 connectio...

Page 103: ...lated parameter but do not finish the verification process For more information on verification see the Primary burner Primary controller Flap valve Flap valve Secondary controller Secondary burner Op...

Page 104: ...em will present more information about the Alert Press the OK button to indicate that you have seen the Alert 4 If an audible alarm on the display is active you can use the Silence button to stop it 1...

Page 105: ...The list is too long to appear on one screen so you must scroll down to see some of the items When you are through looking at the list press OK 6 From the Lockout History screen Fig 128 correct the ca...

Page 106: ...ion mode 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...

Page 107: ...t 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...

Page 108: ...l 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...

Page 109: ...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 pe...

Page 110: ...nlet 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 wir...

Page 111: ...hamber 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 r...

Page 112: ...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 time...

Page 113: ...ity 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 as...

Page 114: ...Fan switch J6 terminal 3 and its connections Make sure the switch is working correctly and is not jumpered or welded 4 Reset and sequence the relay module 5 If the fault persists replace the relay mo...

Page 115: ...s the switch Supply voltage should be present If not the Block Intake Switch is defective and needs replacing 5 If the fault persists replace the relay module 165 Block intake OFF L 1 Check wiring and...

Page 116: ...Water 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...

Page 117: ...Invalid lightoff rate proving 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 repl...

Page 118: ...e module 215 Invalid Purge rate proving 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 rep...

Page 119: ...rounding 3 If fault repeats replace module 226 Invalid Outlet high limit setpoint setting L 1 Return to Configuration mode and recheck selected parameters reverify and reset module 2 If fault repeats...

Page 120: ...lected parameters reverify and reset module 2 If fault repeats verify electrical grounding 3 If fault repeats replace module 237 Invalid DHW Domestic Hot Water connector type setting L 1 Return to Con...

Page 121: ...her on or off See Fig 132 Fig 132 Digital I O Screen A green dot indicates a function that is on There is too much information to appear on one screen Use the left and right arrows to see the rest of...

Page 122: ...Diagnostics button Lead Lag Slave Status Screen 12 6 Statistics The controller can present some summary information about the operation of the system number of pump cycles number of burner cycles etc...

Page 123: ...ed 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 operat...

Page 124: ...t 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...

Page 125: ...r 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 termina...

Page 126: ...8 ADH X 36 20 S2113900 GASKET STRIP FOAM 3 8 X 1 8 ADH X 21 22 R2073007 FRONT PANEL GASKET ASSY 10J3040 DOOR FRONT LOWER SUBASSY NT1000 S2117000 GASKET D SHAPE RUBBER 75 X 94 LG 23 S2116500 GROMMET 2...

Page 127: ...TOP JACKET ASSEMBLY S2117000 GASKET D SHAPE RUBBER 134 LONG 54 S2117900 O RING 1 7 16 OD X 1 16 BUNA N 55 R2073004 PANEL SIDE ASSY 10J1221 PANEL SIDE LH RH NT 1000 S2113900 GASKET STRIP FOAM ADHESIVE...

Page 128: ...5 INCH UNION NPT THREADS 91 P2076500 NIPPLE 1 1 2 NPT X 30 LG BLK 92 10J5150 TRANSITION ASSEMBLY VENTURI 93 A2116700 VENTURI GAS AIR MIXING HONEYWELL 45900450 030 94 S2105200 O RING 4MM THICK X 110MM...

Page 129: ...SEMS WASHER 131 F2032000 RETAINER SPLIT RING 8 132 F2031800 SCREW 10 X 1 2 PHILLIPS PAN HEAD STEEL BLACK OXIDE TYPE 25 133 F2031900 SCREW CAPTIVE 8 32 X 15 16 134 10J126300 COVER CONTROL SLIDING NT 1...

Page 130: ...LAARS Heating Systems Page 126 Fig 140 Machine Frame and Rear Panel 13 3 PARTS ILLUSTRATIONS...

Page 131: ...NeoTherm Boilers and Water Heaters Page 127 Fig 141 Front Panel and Covers...

Page 132: ...LAARS Heating Systems Page 128 Fig 142 Burners and Combustion Chambers...

Page 133: ...NeoTherm Boilers and Water Heaters Page 129 Fig 143 Heat Exchanger Components Fig 144 Burner Detail...

Page 134: ...LAARS Heating Systems Page 130 Fig 145 Electronic Components...

Page 135: ...NeoTherm Boilers and Water Heaters Page 131 Fig 146 Condensate Trap Fig 147 Control Bezel...

Page 136: ...LAARS Heating Systems Page 132 Fig 148 Flow Switch...

Page 137: ...NeoTherm Boilers and Water Heaters Page 133 This page intentionally left blank...

Page 138: ...3 335 3355 Applications Engineering 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 1011 Document H2344800 Dimens...

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