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84 Installing a Cascade System

8.2 Cascade System - Recirculation System Application Example

When using the cascade system, external recirculation can only be connected to and controlled by the NPE-A2

water heater. Set each individual water heater to the appropriate recirculation mode utilizing the 2-way valve and

front panel DIP switches. Refer to the NPE Installation Manual for additional details.

If Recirculation Return Line Is Installed

Connect the domestic hot water return line to the desired number of NPE-A2 water heaters. Set each

unconnected NPE-A2 water heater to Internal Recirculation Mode. The NFC-H boiler should be set to Combi Pre-

heat Mode.

<NPE-A2>

Pressure

Relief Valve

Ball

Valve

Check Valve

Domestic

Cold Water

Supply

Faucet

Sub1

<NPE-A2>

Sub2

<NPE-S2>

Sub3

Heating

Supply

Pressure

Relief Valve

Heating Return

Hydronic

Feed

Water Expansion

Tank

NaviClean

Pump

Air Separator with

Expansion Tank

Optional System

Temperature Sensors

Note

A HotButton and Aquastat cannot be used for cascade systems.

Содержание NFC-250/175H

Страница 1: ...ctions If you cannot reach your gas supplier call the fire department Installation and service must be performed by a qualified installer service agency or the gas supplier The installation must confo...

Страница 2: ...located in a crawl space unless the appliance is located in a detached uninhabitable garage For all residential dwellings a carbon monoxide detector must also be present on each habitable level of th...

Страница 3: ...emperature Sensor 139 12 5 Outdoor Reset Control 139 12 6 Component Assembly Diagrams and Parts Lists 141 1 About the Boiler 7 1 1 Included Items 7 1 2 Accessories 7 1 3 Specifications 8 1 4 Component...

Страница 4: ...bor s phone call your gas provider and follow their instructions If you cannot reach your gas provider call the fire department Do not return to your home until authorized by your gas supplier or the...

Страница 5: ...als such as a clothes line that could obstruct the air flow in or out of the boiler This boiler has been approved for use in the USA and Canada only Using the boiler in any other country will void the...

Страница 6: ...burns Use the lowest operating temperature setting necessary to provide comfortably hot water If your household has children or elderly or disabled residents consider using a lower temperature setting...

Страница 7: ...y Outdoor Temperature Sensor and Cable Air Vent Bushing 3 4in to 1 2in Condensate Trap Universal Temperature Sensor Spare Parts High Altitude Conversion kit and Propane Conversion kit are attached to...

Страница 8: ...250 200H 199 183 159 95 Note 1 Ratings are the same for natural gas models converted to propane use 2 Based on U S Department of Energy DOE test procedures 3 The net AHRI water ratings shown are base...

Страница 9: ...50 200H Internal Recirculation Pump Grundfos UPS 15 78 CIAO2 Part Number 30023987A 0 5 10 15 20 25 30 0 2 4 6 8 10 12 14 16 0 2 4 6 8 10 12 14 16 FT of Head P psi Flow Rate GPM NFC 250 175H NFC 250 20...

Страница 10: ...Cold rolled carbon steel Heat Exchangers Stainless Steel Venting Exhaust 2 in or 3 in PVC CPVC approved polypropylene 2 in or 3 in Special Gas Vent Type BH Class III A B C 2 in or 3 in Stainless Stee...

Страница 11: ...in the Appendixes Intake Air Air Intake Pipe Vent Installation Detector Exhaust Duct Fan Motor Assembly Dual Venturi APS PCB Power Switch PRV Air Vent Connection Gas Pipe Mixing Chamber Igniter Flame...

Страница 12: ...changer APS Power Switch Mixing Valve 3 Way Valve Heating Return Gas Valve ASME Name Plate Mixing Chamber Intake Air Filter Flame Rod Igniter Circulation Pump Water Adjust Valve DHW Exchanger Water Fi...

Страница 13: ...PRV Air Vent Connection 3 4 in D Heating Supply 1 in E Heating Return 1 in F Gas Connection 3 4 in G Condensate Outlet 1 2 in H Cold Water Inlet DHW 3 4 in I Hot Water Outlet DHW 3 4 in J Auto Feeder...

Страница 14: ...do not install the boiler If conversion to Propane Gas is required the included gas conversion kit must be used Refer to 12 1 Gas High Altitude Conversion on page 129 for details WARNING Ensure that t...

Страница 15: ...uded accessories are present in the accessory box and upper container Removing theWood Pallet and the Pallet Brackets 1 Loosen the six screws that secure the wood pallet on the bottom left and right s...

Страница 16: ...any local codes Access to Utilities Water the installation location should be near where the domestic water supply enters the building Gas the installation location should be near where the gas supply...

Страница 17: ...t be located in an area where leakage of the unit or connections will not result in damage to the area adjacent to the appliance or to lower floors of the structure When such locations cannot be found...

Страница 18: ...he framing is non standard or uneven reinforce the area before installing the boiler Avoid installation on common walls as the unit will make some operational noises while it is running To mount the b...

Страница 19: ...ler on the wall WARNING The boiler is heavy Always lift the unit with assistance Be careful not to drop the boiler while lifting or handling it to avoid bodily injury or damage to the unit Do not rest...

Страница 20: ...nts listed above will void your warranty and may result in premature heat exchanger failure and property damage 3 1 Installing a Space Heating System The fire tube type heat exchanger of the Navien NF...

Страница 21: ...the space heating system Freeze protection for new or existing systems requires specially formulated glycol which contains inhibitors to prevent the glycol from attacking the metallic system component...

Страница 22: ...er Note Before installing the vent line and any vent fittings you must be familiar with the LWCO and pressure relief valve installation guidelines 3 1 2 Essential Elements in a Space Heating System Ai...

Страница 23: ...l codes LowWater Cut Off LWCO Appliance Internal LWCO The Navien NFC H boiler is equipped with a factory installed pressure sensing type low water cutoff LWCO appliance The minimum operation pressure...

Страница 24: ...e discharge clearly visible Do not direct the discharge line to a location where freezing could occur Ensure that the discharge line is not plugged or obstructed ExpansionTank An expansion tank must b...

Страница 25: ...Boiler Primary loop from the System Secondary loop s Refer to the following illustration for a typical water piping example with a Navien manifold system Space Heating Supply Space Heating Return Afte...

Страница 26: ...Water Regulations 40 CFR Part 143 3 If you suspect that your water is contaminated in any way discontinue use of the DHW and contact an authorized technician or licensed professional Contaminant Maxi...

Страница 27: ...a closed water supply system Contact the water supplier or local plumbing inspector on how to correct the situation Do not plug the relief valve Navien is not responsible for performance issues of th...

Страница 28: ...limitation appliance may be needed Consult your local code requirements to determine if this appliance is required Refer to the following illustration for a typical DHW piping example for the boiler...

Страница 29: ...rst year of operation the neutralizer should be checked every few months for depletion and replaced as needed c From the boiler into a laundry tub Note The bottom of the boiler must be higher than the...

Страница 30: ...cal Navien distributor As part of this annual maintenance procedure make sure to clean out the condensate trap which may contain excess debris Drain the condensate within the trap then replace with fr...

Страница 31: ...rain fitting on the appliance to prevent the backflow of condensate Do not connect more than one appliance to the neutralizer If option b p 28 is selected as the disposal option the Navien condensate...

Страница 32: ...ent may not allow for the boiler to fully purge The cap must be completely unscrewed and removed to complete the procedure Tighten the air vent cap and the vent screws when the system is full Air Vent...

Страница 33: ...maintenance of the boiler is required when water quality does not meet standards Damage caused by poor water quality is not covered under warranty The table above shows the maximum contaminant levels...

Страница 34: ...at have a guaranteed positive pressure e g in close proximity to the water fill and expansion tank Note Connecting an air vent on top of the boiler is recommended 2 Close the manual and automatic air...

Страница 35: ...system as doing so will guarantee the lowest pressure in the system will be at least equal to the tank and make up water pressure Ensure the expansion tank cannot become isolated from the boiler anyt...

Страница 36: ...works in conjunction with the flow sensor to detect and control the direct water flow within the system and is installed on the water piping module Refer to 1 4 Components on page 11 for details Mixin...

Страница 37: ...are intended to explain the system piping concept only Install a NaviClean filter in the system return to remove foreign objects from the system Foreign objects inside the system may result in abnorm...

Страница 38: ...drawings are intended to explain the system piping concept only Install a filter in the system return to remove foreign objects from the system Foreign objects inside the system may result in abnormal...

Страница 39: ...from the system Foreign objects inside the system may result in abnormal system operation Refer to 3 4 Filling the System on page 32 for make up water connections and refer to the requirements of you...

Страница 40: ...6 6 System Application Air Handler System with RS 485 Communication Thermostat Outdoor Sensor Air Flow Air Handler Make up Water Expansion Tank COMMCable Pressure Relief Valve Backflow preventer Pres...

Страница 41: ...s the default mode for DHW recirculation To select external recirculation refer to the combi pre heat and external recirculation sections in 11 5 3 Setting the DHW Operation on page 114 for details N...

Страница 42: ...C T S_ZONE1 R W C AC24VN AC24VL lLWCO R W C T S_Recir COM NO NC ZONE_V V3 COM Recirculation Pump Wired HotButton Pump Ground Wired HotButton NaviCirc Sold Separately DHW Supply Return Water City Water...

Страница 43: ...24VN AC24VL lLWCO R W C T S_Recir COM NO NC ZONE_V V3 COM NO NC ZONE_V V2 COM NO NC ZONE_V V1 Recirculation Pump Pump Ground DHW Supply Return Water City Water Supply Check Valve Check Valve Recircula...

Страница 44: ...C ZONE_V V2 COM NO NC ZONE_V V1 N A H DHW PRI L N L N L N L N L Z3 Z2 Z1 SUPPLY TEMPERATURE SENSOR RETURN OUTDOOR T S_ZONE3 R W C T S_ZONE2 R W C T S_ZONE1 R W C AC24VN AC24VL lLWCO R W C T S_Recir CO...

Страница 45: ...re disconnecting them when you work on the controls Wiring errors can cause abnormal and dangerous operation Verify proper operation after servicing Note The installation must comply with National Ele...

Страница 46: ...E3 R W C T S_ZONE2 R W C T S_ZONE1 R W C AC24VN AC24VL lLWCO R W C T S_Recir COM NO NC ZONE_V V3 COM NO NC ZONE_V V2 COM NO NC ZONE_V V1 SUPPLY TEMPERATURE SENSOR RETURN OUTDOOR T S_ZONE3 R W C T S_ZO...

Страница 47: ...ecir COM NO NC ZONE_V V3 COM NO NC ZONE_V V2 COM NO NC ZONE_V V1 SUPPLY TEMPERATURE SENSOR RETURN OUTDOOR T S_ZONE3 R W C T S_ZONE2 R W C T S_ZONE1 R W C 24 VAC N Thermostat Input 24 VAC L Thermostat...

Страница 48: ...VN AC24VL lLWCO R W C T S_Recir COM NO NC ZONE_V V3 COM NO NC ZONE_V V2 COM NO NC ZONE_V V1 Thermostat 3 Thermostat 2 Thermostat 1 Recirculation Timer Aquastat or HotButton Push Button N A H DHW PRI L...

Страница 49: ...ostat Input 24 VAC L Thermostat 1 Recirculation Timer Aquastat or HotButton Push Button N A H DHW PRI L N L N L N L N L Z3 Z2 Z1 SUPPLY TEMPERATURE SENSOR RETURN OUTDOOR T S_ZONE3 R W C T S_ZONE2 R W...

Страница 50: ...M NO NC ZONE_V V1 Thermostat 3 Thermostat 2 Thermostat 1 N A H DHW PRI L N L N L N L N L Z3 Z2 Z1 System pump max 2 5 A Recirculation pump max 2 5 A Recirculation Timer Aquastat or HotButton Push Butt...

Страница 51: ...Thermostat Input 24 VAC L Thermostat 2 24 VAC N Thermostat Input 24 VAC L Thermostat 1 N A H DHW PRI L N L N L N L N L Z3 Z2 Z1 System pump max 2 5 A Recirculation pump max 2 5 A Pump Ground Zone val...

Страница 52: ...by minimizing unnecessary pump operation The communication link also provides an optimal control environment for freeze protection SUPPLY TEMPERATURE SENSOR RETURN OUTDOOR T S_ZONE3 R W C T S_ZONE2 R...

Страница 53: ...ystem with Zone Valves SUPPLY TEMPERATURE SENSOR RETURN OUTDOOR T S_ZONE3 R W C T S_ZONE2 R W C T S_ZONE1 R W C AC24VN AC24VL lLWCO R W C T S_Recir COM NO NC ZONE_V V3 COM NO NC ZONE_V V2 COM NO NC ZO...

Страница 54: ..._V V1 N A H DHW PRI L N L N L N L N Z2 Z1 Air Handler SUPPLY TEMPERATURE SENSOR RETURN OUTDOOR T S_ZONE3 R W C T S_ZONE2 R W C T S_ZONE1 R W C NFC H Connect the pump wires to the system pump NFC H Sys...

Страница 55: ...C H Cable tie Note To control the boiler supply or return water temperature using the external temperature sensor configure the system accordingly On the front panel press the Menu button to enter the...

Страница 56: ...placing the appliance in operation To avoid danger from explosion and fire do not use a flame to check for a gas leak Perform a bubble test on the joints to check for gas leaks If a leak exists bubbl...

Страница 57: ...ether the use of 1 2 gas pipe is approved in the area CAUTION Prior to using an excess flow valve EFV in the gasline checkthemanufacturer sminimumand maximum flow capacity rating An improperly sized E...

Страница 58: ...System with Multiple Regulators Recommended Gas Regulator 2 Stage Low Pressure Regulator before entering home or building Gas Tank Full size Gas Pipe High Pressure Regulator Single Regulator System Ga...

Страница 59: ...230 2 080 1 950 1 840 1 630 3 in 11 300 7 780 6 250 5 350 4 740 4 290 3 950 3 670 3 450 3 260 2 890 4 in 23 100 15 900 12 700 10 900 9 660 8 760 8 050 7 490 7 030 6 640 5 890 In Cubic Feet ft3 per Ho...

Страница 60: ...Gas Pressure WARNING The boiler cannot function properly without sufficient inlet gas pressure Measuring the inlet gas pressure should be performed by a licensed professional only The inlet gas pressu...

Страница 61: ...fall within the ranges specified on page 8 To measure the inlet gas pressure 1 Shut off the manual gas valve on the gas supply line OPEN CLOSE OPEN CLOSE OPEN CLOSE Gas Valve Opened Closed 2 Turn on...

Страница 62: ...ombustion air you MUST Remove contaminants permanently or Relocate air inlet and vent terminations to other clean areas The warranty does not cover damage caused by air contaminants If you must instal...

Страница 63: ...pecial venting system The vent system will operate with a positive pressure in the pipe Exhaust gases must be piped directly outdoors using the vent materials and rulesoutlinedintheseinstructions Dono...

Страница 64: ...er visible 3 Tighten the clamp with a socket wrench 8 mm to properly seal the joint Connecting the Pipe to theVent Collar Note Do not use primer or cement on the appliance connection WARNING When cutt...

Страница 65: ...s CAUTION Do not start the vent run with a street elbow at the vent collar Using an elbow directly at the collar will not allow for a tight seal between the appliances and vent pipe A length of straig...

Страница 66: ...pe The vent installation detector only detects separation of the vent pipe from the boiler collar if fully inserted 3 0 in 76 mm The vent installation detector will not detect the separation of connec...

Страница 67: ...67 Venting for Combustion Air WARNING The vent installation detector Detectable Undetectable...

Страница 68: ...ake ducts To ensure the draw of air directly from and exhaust of air directly to the outside of the building create an airtight seal from the boiler collar to the vent termination Intake materials can...

Страница 69: ...tion air inlet to any other appliance 36 in 91 cm 12 in 30 cm K Clearance to a mechanical air supply inlet 6 ft 1 83 m 3 ft 91 cm above if within 10 ft 3 m horizontally L Clearance above paved sidewal...

Страница 70: ...and malfunction of the boiler However building codes in most jurisdictions disallow negative pressures in residences In a home with a well balanced air supply the heat exchanger should not be in dang...

Страница 71: ...t located above the terminal within a horizontal distance of 2 feet 61 cm from the center line of the terminal E Clearance to unventilated soffit F Clearance to outside corner G Clearance to inside co...

Страница 72: ...orch deck or balcony 12 in 30 cm 1 In accordance with the current CSA B149 1 Natural Gas and Propane Installation Code 2 In accordance with the current ANSI Z223 1 NFPA 54 National Fuel Gas Code A ven...

Страница 73: ...materials Do not use cellular core PVC ASTM F891 cellular core CPVC or Radel polyphenolsulfone for the exhaust vent WARNING Do not mix components from different systems The vent system may fail and ha...

Страница 74: ...s shown in the table above Centrotherm Innoflue Flexible Certified to UL1738 and ULCS636 IFVL02xxx 2 or IFVL03x xx 3 IFSFC02 or IFSFC03 2 or 3 Rigid to Flex Male Adapter ISEI0203 or ISIA0203 2 t o 3 I...

Страница 75: ...and materials The subsections that follow describe some typical venting configurations but do not include all possible options The following PVC vent terminations are approved for use with this appli...

Страница 76: ...the same area 36 900 mm min 12 300 mm min 12 300 mm min Exhaust Gas 12 300 mm min From any obstruction above below left or right Intake Air Non Concentric Sidewall Venting Air is drawn from a differen...

Страница 77: ...ipe terminations Concentric Sidewall Venting 1 25 mm min Combustion Air Intake CombustionAirIntake Exhaust Gas Exhaust Gas Maintain 12 300 mm min clearance above highest anticipated snow level or grad...

Страница 78: ...PP Centrotherm Innoflue Flex NFC 250 200H NFC 250 175H 2 in 50 ft Only the flexible vent models listed above are approved for use with this appliance All flexible vent pipe must be installed VERTICALL...

Страница 79: ...the boiler Set the DIP switches appropriately based on the installation environment 6 1 DIP Switch 1 Set of 6 Switches The DIP SW1 Set of 6 Switches on the circuit board configures the operation stat...

Страница 80: ...Used 8 OFF Unused 8 ON Note When PCB DIP switch 2 8 is set to On ensure that CPVC polypropylene or stainless steel is used for exhaust venting This unit may be installed at elevations up to 10 100 ft...

Страница 81: ...cilitate end user maintenance and servicing Connect the boiler to a 110 120V AC at 60 Hz with a maximum of 15 A The boiler must be electrically grounded If using the power plug ensure that the electri...

Страница 82: ...to meet high volume heating demands Some possible connection options include the following Example of a Basic Cascade System Application Pressure Relief Valve Main Faucet BallValve Optional System Te...

Страница 83: ...A2 series water heaters to the recirculation line If this is the case set any unconnected A model water heaters to Internal Recirculation Mode For any NPE A2 water heater that is connected to the rec...

Страница 84: ...irculation Return Line Is Installed Connect the domestic hot water return line to the desired number of NPE A2 water heaters Set each unconnected NPE A2 water heater to Internal Recirculation Mode The...

Страница 85: ...2 Installation Manuals for additional details The NFC H boiler should be set to Combi Pre heat Mode NPE A2 Pressure Relief Valve Ball Valve Pressure Relief Valve Faucet Check Valve Sub1 NPE S2 Sub2 NP...

Страница 86: ...then select START 8 3 Connecting the Communication Cables You can connect one NFC H boiler with up to 15 Navien water heaters NPE A2 or NPE S2 Model using the Ready Link communication cables Select th...

Страница 87: ...boiler panel press the Command dial button when the following screen appears All the display screens on the configured water heaters will return to the temperature display Note To add additional sub w...

Страница 88: ...t it for punctures cracks or blockages prior to connecting it to the boiler unit Horizontal vent pipe runs must be supported every 4 feet 1 2 m minimum All vertical vent pipe runs must be supported ev...

Страница 89: ...away from buildings as long as the total allowable vent lengths maximum number of elbows and distances to air intake restrictions are observed If the boiler units will be installed in areas where snow...

Страница 90: ...ystems or unlisted pipes or fittings All plastic components and specified primers and glues of the certified vent system must be from a single system manufacturer and must not be intermixed with anoth...

Страница 91: ...ure times DANGER Be careful not to apply force or impact to pipes after making connections An impact may break the bond and harmful gas might leak inside the room Vent Pipe Pitch and Supports For hori...

Страница 92: ...5 80 142 1 409 400 6 68 121 1 609 300 7 60 106 Note Every 90 elbow used is equivalent to 8 linear feet 2 4 m of vent length Branch pipe lengths are not added to the allowable equivable vent lengths th...

Страница 93: ...uel Gas Code ANSI Z223 1 NFP A 54 When applicable the installation must conform with the Manufacture d Home Construction and Safety Standard Title 24 CFR Part 3280 Mobile Homes WARNING If the informat...

Страница 94: ...ID wiring from the harness 3 Connect the Common Vent Collar Kit to the exhaust duct of the boiler unit Maintenance Port Navien Common Vent Collar Kit has a maintenance port to allow you to easily insp...

Страница 95: ...the appliance connection 1 Measure 1 1 2 from the end of the vent pipe then draw a mark at that distance Mark 1 1 2 from the end of the pipe 1 1 2 4 Tighten the four mounting screws to secure the Comm...

Страница 96: ...system 2 Insert the vent pipe into the vent collar to start the vent run Make sure to completely slide the vent into the collar until the end makes contact with the bottom of the socket Note Verify th...

Страница 97: ...p solution bubbles will form on the connection if any leaks exist 2 Assemble the wye joint or wye assembly to the vent pipe Apply solvent cement to the mating surfaces Apply Cement HubWye Assembly App...

Страница 98: ...trunk pipe to each side of the wye joint or wye assembly Each trunk pipe is connected to the other wye joint or wye assembly Refer to Connecting Pipes with Cement on page 91 for more information DANGE...

Страница 99: ...Vent System Refer to the following figures when setting the common vent type To view and configure the cascade settings press the Back button and the Menu button simultaneously for 3 seconds and then...

Страница 100: ...weather situations the temperature of the exhaust will be much warmer than the ambient air Therefore you will see water vapor being produced at the termination 9 6 3 Direct Vent Application Horizonta...

Страница 101: ...the common vent system and direct the end of the hose to a drain 7 9in 200mm WARNING After installing the condensate drain hose check the loop again to ensure that the prime water is not spilled The l...

Страница 102: ...t Harmful exhaust gas may leak if the gasket is not installed or if it is not installed properly Gasket 9 8 Maintenance Periodically check the damper condition inside the Common Vent Collar Kit throug...

Страница 103: ...t piping clear of combustible materials including clothing cleaning materials and rags Connecting the Gas Supply Yes No Does the gas supply match the type specified on the boiler s rating plate Is the...

Страница 104: ...near the boiler Have you installed a discharge drain tube from the pressure relief valve to within 6 12 in 150 300 mm of the floor Connecting the Condensate Drain Yes No Have you installed a condensat...

Страница 105: ...to facilitate end user maintenance Have you checked the polarity of the electrical connection PCB DIP switch setting DIP SW2 Set of 8 Switches Yes No Gas type Is switch 1 set correctly for LP ON or NG...

Страница 106: ...liance if any parts have been under water Immediately call a licensed professional to inspect the appliance and to replace any part of the control system and any gas control which has been under water...

Страница 107: ...mell interior of boiler enclosure Do not proceed with startup if there is any indication of a gas leak If overheating occurs or the gas supply fails to shut off do not turn off electrical power to the...

Страница 108: ...s powered on The wizard must be completed before the boiler can be used 1 Set the Language English French 2 Set the time YYYY MM DD HH MM SS 3 Set the units to display Celsius C L M Meter Fahrenheit F...

Страница 109: ...ault space heating return water temperature range is 86 F 30 C Absolute MIN to 149 F 65 C Absolute MAX You can adjust the temperature ranges in the parameter settings menu The boiler will retain your...

Страница 110: ...e the Command dial to the right to select the DHW temperature 3 Press the Command dial to select the DHW temperature The highlighted section will flash 4 Rotate the Command dial to the right or left t...

Страница 111: ...displayed when the outdoor reset option 25 Outdoor Reset is enabled 1 Finned Tube Baseboard 2 FAN Coil 3 Cast Iron Baseboard 4 Low Mass Radiant 5 High Mass Radiant 6 Radiator 7 Custom set by installe...

Страница 112: ...Outdoor High Temp Set Set the maximum temperature for the Outdoor Reset Control Setting range MIN Set point 9 F 5 C 104 F 40 C Default 70 F 21 C 3 3 Outdoor Low Temp Set Set the maximum temperature fo...

Страница 113: ...3 C after a set time elapses Once the boost interval time expires or the heat load demand is satisfied the boiler will then revert back to its normal space heating settings CAUTION An outdoor sensor...

Страница 114: ...Intelligent mode cannot be used for cascade systems Set to External Default Always On Always On Intelligent Weekly Aquastat Manual 11 5 3 Setting the DHW Operation To set the boiler s DHW operation pr...

Страница 115: ...option you must set up the Time settings in the Configuration menu Note If there is a SH Demand signal during external recirculation pre heating will take priority and space heating will start afterwa...

Страница 116: ...op of the list When Installing the Cascade System When using the recirculation feature in the cascade system you can choose commands in the menu to preheat according to the set DHW temperature Refer t...

Страница 117: ...French Default English Rotate the Command dial to switch between the list of errors Press the Command dial to select an error to view detailed information Press the Back button to return to the previo...

Страница 118: ...pply Limit No of Times Number of times Recirculation supply temperature limit control has activated 10 T High No of Times Number of times combustion stopped due to supply return temperature Item Descr...

Страница 119: ...e boiler system Setting parameters improperly may lead to property damage or injury 11 6 2 Viewing Input and Output Status To view the boiler s input and output status press the Back button and the Me...

Страница 120: ...capacity limit 20 100 Default 100 9 SH Min Burning Time Set the low load combustion time at initial operation Setting range 1 20 min Default 1 min 10 Burning Acceleration Time Set the time to reach t...

Страница 121: ...ice notification Setting range 30 3650 days 10 years It can be set in 10 day increments Default 1820 days 5 years Item Description 11 Zone T S Start up Delay Time Set the delay time for the burner to...

Страница 122: ...dial to select a parameter or to confirm after making changes Press the Back button to return to the previous screen or menu Item Description 26 Service Notif Cycle Set the service notification accor...

Страница 123: ...Cascade Main setting mode select Start The setting mode is entered and the IDs of all boilers that can communicate with the Main via the RS485 communication line are initialized The boilers whose IDs...

Страница 124: ...urned on as soon as you enter the test mode Press the Command dial to toggle the pump operation On Off Off On Press the Back button to return to the previous screen or menu Item Description 1 NaviLink...

Страница 125: ...e Setting is set to Zone Pump System The Zone 1 valve output Zone 2 valve output and Zone 3 valve output are available only when the Zone Setting is set to Zone Valve System Item Description 3 Zone 1...

Страница 126: ...k button and the Menu button simultaneously for 3 seconds and then select 7 Special Operations Rotate the Command dial to switch between the operation modes Press the Command dial to select an operati...

Страница 127: ...n fan motor Manual RESET E110 Abnormal air pressure Manual RESET E205 Abnormal operation heating supply thermistor Auto RESET E218 Abnormal operation heating return thermistor Auto RESET E278 Abnormal...

Страница 128: ...eration Pre Heat Aquastat Alarm E762 Abnormal flue gas duct Vent pipe not properly inserted Auto RESET E773 Using the wrong gas Parameter RESET E777 Abnormal operation LWCO limit external device Auto...

Страница 129: ...risk of fire or explosion or to prevent property damage personal injury or death The qualified service agency is responsible for the proper installation of this kit The installation is not proper and...

Страница 130: ...e 0 5 399 ft 5 400 10 100 ft 0 10 100 ft Orifice GAS NG 20052127A 4 8 7 90 GAS NG H 20052133A 5 05 8 4 GAS LP 20052134A 3 90 6 00 Factory Installed For High altitude For Propane Orifice Size 4 8 7 90...

Страница 131: ...alve outlet pressure could result in damage to the valve causing potential severe personal injury death or substantial property damage Navien NFC H boilers are shipped ready to fire natural gas ONLY 5...

Страница 132: ...as this may damage or crack the components DANGER Inspect the O ring between the gas valve and gas valve inlet adapter whenever they are disassembled The O ring must be in good condition and must be i...

Страница 133: ...e that you have turned off the power to the boiler before accessing the DIP switches 1 2 3 4 5 6 O N O N 1 2 3 4 5 6 7 8 Switch Function Setting Comment 1 Gas Type Natural Gas 1 OFF Refer to Table 1 o...

Страница 134: ...X mode refer to 11 6 7 Setting the Special Operation Modes on page 126 Measure the CO2 value at high fire If the CO2 values do not match Table 2 at high fire do not adjust the gas valve Check for the...

Страница 135: ...is located behind the screw on cover This must be removed first d At high fire do not check the offset value and never adjust the gas valve DANGER Improper gas valve settings can cause severe personal...

Страница 136: ...ance has been converted to Propane Gas or High Altitude Place these labels adjacent to the rating plate as shown in Figure 11 Figure 11 Proper Placement of Propane Gas or High Altitude Conversion Labe...

Страница 137: ...s must be electrically grounded as required by National Electrical Code T S Thermostat Temp Temperature Factory jumper is connected as default Remove it when using an additional appliance NOTICE Groun...

Страница 138: ...ZONE1 Pump Relay 3 ZONE3 Pump Relay 2 ZONE2 Pump WD PSS Heating Return Thermistor System Return Thermistor INLET Thermistor System Supply Thermistor Outdoor Thermistor 1 2 3 4 5 6 O N O N 1 2 3 4 5 6...

Страница 139: ...t 12 5 Outdoor Reset Control The Outdoor Reset Control feature may be used to enhance energy efficiency while maintaining optimal heating performance With the Outdoor Reset Control the space heating t...

Страница 140: ...rature ranges OutdoorTemperature Sensor Installation Guidelines Heat Load Supply Set Point Range Return Set Point Range Finned Tube Baseboard default 120 180 F 48 5 82 C 101 147 F 38 63 5 C Fan Coil 1...

Страница 141: ...141 Appendixes 12 6 Component Assembly Diagrams and Parts Lists 12 6 1 Case Assembly 12 5 4 13 14 15 18 17 6 16 7 11 1 3 20 24 25 26 27 28 2 19 8 9 10 21 22 23...

Страница 142: ...007643 12 Intake Air Filter 30016248B 30016248 13 Air Vent Adapter Packing 20051553 14 Air Vent Adapter 20051171 15 Screw 5X14 20046629 16 Exhaust Duct Assembly 30024848A 30024848 17 Base Packing 2004...

Страница 143: ...143 Appendixes 12 6 2 Heat Exchanger and Waterway Assembly 23 22 21 20 19 18 1 10 9 29 8 7 6 5 4 3 14 13 2 11 12 30 31 24 25 26 27 28 15 16 17...

Страница 144: ...ensor 30018511A 30015811 12 Air Pressure Sensor Hose 20006685 13 Thermistor Exhaust 300220489A 30020489 14 Screw 4x6 20006535 15 O ring P26 20032409 16 Drain Pan Adapter 20044473 17 Screw 4X10 2003875...

Страница 145: ...19 Description Service code Part Remark 1 Fan Assembly 30019826A 30026225 2 Venturi Packing 20018079 3 Dual Venturi 30027110A 30026308 4 Intake Pipe 30019120A 30019120 5 Screw 4x10 20034293 6 Orifice...

Страница 146: ...0040227 23 Flame Rod Packing 30027109A 20045645 24 Flame Rod 30027109A 30025791 25 Igniter Packing 30027108A 20045644 26 Igniter 30027108A 30025790 27 Flame Inspection Window Glass 30021277A 20040236...

Страница 147: ...1098 2 Block Plate 20044475 3 Block Plate Packing 20045394 4 Heating Return Adapter Packing 20045397 5 DW filter 30014683 6 O Ring P25 20032528 7 Bolt 4x10 20038757 8 Heating Return Adapter 20044488 9...

Страница 148: ...DHW Inlet Connection Adapter 20044477 38 DHW Inlet Adapter Packing 20045393 39 DHW Inlet Adapter 20044701 40 O Ring P19 20017211A 20017211 41 Water Filter 30008171A 30008171 42 Heating Supply Adapter...

Страница 149: ...Memo...

Страница 150: ......

Страница 151: ...Contact a licensed professional for the affected system for example a plumber or electrician When you contactTechnical Support please have the following information at hand Model number Serial number...

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Содержание NFC-250/175H

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