On-Demand Water Heater Installation Manual and Owner’s Guide R D R 540 model only ANSI Z21.10.3・CSA 4.3 Models • 240 Indoor • 340 Indoor • 540 Indoor • 240 Outdoor (USA Only) • 340 Outdoor (USA Only) • 540 Outdoor (USA only) Gas Tankless Water HeaterTM Suitable for combination potable water heating and space heating. Please refer to local codes for spaceheating compliance.
Contents CONTENTS Installation Manual SPECIFICATIONS..............................................4 INTRODUCTION...........................................5 SAFETY GUIDELINES.....................................6 SAFETY DEFINITION.....................................6 GENERAL.......................................................6 INSTALLATION.................................................7 GENERAL.......................................................7 CLEARANCES.......................................
Installation Manual Installation Manual CONGRATULATIONS Congratulations and thank you for choosing our tankless water heater. Before use, we recommend that you read through this installation manual carefully. Keep this manual for future reference. If you need an additional manual, contact the manufacturer or your local distributor. When you call, please tell us the product name and the serial number of your unit written on the rating plate of the water heater.
Installation Manual Specifications SPECIFICATIONS 240 Indoor Model 240 Outdoor 340 Indoor 340 Outdoor 540 Indoor 540 Outdoor Natural Gas Input (Operating Range) BTU/h Min.: 15,000 Max.: 160,000 Min.: 15,000 Max.: 180,000 Min.: 15,000 Max.: 199,000 Propane Input (Operating Range) BTU/h Min.: 13,000 Max.: 160,000 Min.: 13,000 Max.: 180,000 Min.: 13,000 Max.: 199,000 Gas Connection 3/4" NPT Water Connections 3/4" NPT Water Pressure* psi (MPa) 15 - 150 (0.
Installation Manual Introduction INTRODUCTION • This manual provides information necessary for the installation, operation, and maintenance of the water heater. • The model description is listed on the rating plate which is attached to the side panel of the water heater. • Please read all installation instructions completely before installing this product. • If you have any problems or questions regarding this equipment, consult the manufacturer or its local representative.
Installation Manual Safety Guidelines SAFETY GUIDELINES SAFETY DEFINITION DANGER WARNING CAUTION NOTICE Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. Indicates an imminently hazardous situation which, if not avoided, could result in death or serious injury. Indicates an imminently hazardous situation which, if not avoided, could result in minor or moderate injury. Indicates information considered important but not hazard related.
Installation Manual Installation INSTALLATION GENERAL 1. Follow all local codes, or in the absence of local codes, follow the current edition of the National Fuel Gas Code: ANSI Z223.1/NFPA 54 in the USA or B149.1 Natural Gas, Propane Installation Code in Canada. 2. All gas water heaters require careful and correct installation to ensure safe and efficient operation. This manual must be followed exactly. Read the “Safety Guidelines” Section. 3. The manifold gas pressure is preset at the factory.
Installation Manual Installation • Installation and service must be performed by a qualified installer (for example, a licensed plumber or gas fitter). Otherwise, the warranty will be void. • The installer (licensed professional) is responsible for the correct installation of the water heater and for compliance with all national, state/provincial, and local codes. WARNING • The manufacturer does not recommend installing the water heater in a pit or location where gas and water can accumulate.
Installation Manual Installation CLEARANCES Top Maintain all clearances around the water heater. Failure to do so could create a fire hazard, potentially leading to death, serious WARNING injury, and/or property damage. Back Side Side Front Bottom Model Top Bottom Front Back Sides 240 Indoor 340 Indoor 540 Indoor 12 in. (305 mm) 12 in. (305 mm) 4 in.* (102 mm) 0.5 in. (13 mm) 3 in. (76 mm) 240 Outdoor 340 Outdoor 540 Outdoor 36 in. (914 mm) 12 in. (305 mm) 24 in. (610 mm) 0.5 in.
Installation Manual Installation 1. Temperature remote controller: 100209924 (TM-RE42) The temperature remote controllers have three functions. It allows the output temperature from the water heater to be adjusted and it also works as a diagnostic tool and it provides a concise error code whenever there is a problem with the unit. See the Troubleshooting Section (pp.53 to 56) for information on possible error codes. 2.
Installation Manual Installation WARNING FOR INSTALLATIONS FOR YOUR SAFETY, READ BEFORE INSTALLATION: Do not install the heater where water, debris or flammable vapors may get into the flue terminal. This may cause damage to the heater and void the warranty. Do not have the vent terminal pointing toward any opening into a building. Do not locate your heater in a pit or location where gas and water can accumulate.
Installation Manual Installation HIGH-ALTITUDE INSTALLATIONS • • WARNING • Adjust the appropriate DIP switches according to model and elevation as shown below. DO NOT adjust the other DIP switches. Turn off the power supply to the water heater before changing the DIP switch settings. Failure to observe these warnings could lead to carbon monoxide poisoning or death. Check the elevation where your water heater is installed. Set DIP switches shown in the table below depending on the altitude.
Installation Manual Installation VENTING INSTRUCTIONS Indoor models -General- • Improper venting of this appliance can result in excessive levels of carbon monoxide which can result in severe personal injury or death. • Improper installation can cause nausea or asphyxiation, severe injury or death from carbon monoxide and flue gases poisoning. Improper installation will void WARNING product warranty. • When installing the vent system, all applicable national and local codes must be followed.
Installation Manual Installation -Combustion air supplyThis gas water heater requires an adequate source of clean air for combustion and ventilation. Without sufficient air, your water heater may not operate properly and may emit excessive and abnormal amounts of carbon monoxide which may result in WARNING carbon monoxide poisoning or death. • The guidelines in this section apply to installations within the United States. All U.S. installations must conform to the National Fuel Gas Code, ANSI Z223.
Installation Manual Installation Your water heater’s BTU/h rating is on the rating plate. The BTU/h ratings should be on the other appliances’ rating plates. If you have trouble determining the BTU/h ratings, contact the manufacturer or have a qualified person determine the ventilation requirements. NOTICE: If you are replacing your old water heater with one that has a higher BTU/h rating, the amount of ventilation required may be greater.
Installation Manual Installation Determine type of ventilation There are several types of ventilation that can be used. The various options are listed below. See also the illustrations on the next page. 1. 2. 3. 4. 5. Direct to outdoors Vertical ducts Horizontal ducts Single opening (not recommended; must be at least 100 in2 (6.5 cm2) . Not appropriate for confined spaces smaller than 50 ft3 (1.42 m3) per 1,000 BTU/h or when getting air from another room.
Installation Manual Installation Combustion air supply options Gable vent to outdoors Install above insulation 12” (305 mm) maximum Outlet air to attic 1 in2 (6.5 cm2) per 4,000 btu/h Confined Space Two permanent Openings Alternate Air Inlet 1 in2 (6.5 cm2) per 4,000 btu/h Inlet air from the crawl space 1 in2 (6.
Installation Manual Installation -Exhaust vent (ABS, PVC, CPVC, or polypropylene vent)The Indoor models can be vented with ABS, PVC, CPVC, or polypropylene (temperature rated up to 149 °F). Vent material certified to ULC S636 standards is recommended in the USA. In Canada, plastic venting must be certified to ULC S636 standards.
Installation Manual Installation -DIP switch settings for vent length- Typical installations using PVC, CPVC, ABS, or polypropylene vent • Adjust the appropriate DIP switches according to model and vent length as shown below. DO NOT adjust the other DIP switches. Turn off the power supply to the water heater before changing the DIP switch settings. Failure to observe these warnings could lead to carbon monoxide poisoning or death.
Installation Manual Installation 3" (76 mm) vent connection 3"(76 mm) straight pipe 4" (102 mm) vent connection 4" (102 mm) straight pipe 4" (102 mm) straight pipe 3" (76 mm) straight pipe 3" (76 mm) coupling 3" (76 mm) coupling (included) For PVC venting only (included) For PVC venting only Exhaust vent collar (Female) Intake vent collar (Female) 1.
Installation Manual Installation 3" (76 mm) vent connection 4" (102 mm) vent connection 4" (102 mm) straight pipe 3"(76 mm) straight pipe 3" (76 mm) coupling 3" (76 mm) elbow with bird screen Intake vent collar (Female) 3" (76 mm) elbow with bird screen (included) For PVC venting only Intake vent collar (Female) Exhaust vent collar (Female) 3"x 4" (76 x 102 mm) increaser Exhaust vent collar (Female) 1.
Installation Manual Installation -Exhaust vent (Stainless steel vent)- This is a Category IV appliance and must be vented accordingly. The vent system must be sealed airtight. All seams and joints without gaskets must be sealed with high heat resistant silicone sealant or UL listed aluminum adhesive tape having a minimum temperature rating of 160 °F (71 °C). For best results, a vent system should be as short and straight as possible.
Installation Manual Installation 4" vent connection for direct-vent installation 4" (102 mm) stainless steel vent straight pipe 4" (102 mm) stainless steel vent straight pipe • 4” (102 mm) stainless steel vent straight pipe 4" (102 mm)elbow with bird screen Exhaust vent collar of the Indoor models (Female) Intake vent collar (Female) Exhaust vent collar of the Indoor models (Female) Intake vent collar (Female) 4" vent connectionfor singl
Installation Manual Installation -Common-venting system- The Indoor model can be vented together using the same exhaust and intake venting. • Up to 8 water heaters can be common-vented together. • A non-return valve (100113130) must be used for each water heater that is part of the system. • The water heaters must all be direct-vented. • The common-venting system shall be in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or B149.
To determine the dimension of a system Determine the vent diameter (D) and the total vent length based on the number of water height (H). See the table below. Elbow terminal Elbow terminal Intake • Total vent length (L)="H"+"W" + Exhaust (Number of Elbows x 5) "H" • Vent diameter="D" "D" "W" NOTICE • Regarding the clearances between the exhaust termination and the to pp. 26 to 28. • Insert bird screen in elbow terminals.
Installation Manual Installation -Vent termination clearancesInside corner detail V = Vent terminal X = Air supply inlet G = Area where the terminal is not permitted V D H A V L E V B B C Fixed closed Operable V F V B Operable Fixed closed V B X V B V M I J A X V K Regulator/Gas meter vent outlet B Canada Installations1 US Installations2 Direct vent and other than Direct vent Other than direct vent direct vent A Clearance above grade, veranda, porch, deck, or balcony 1 ft (30 cm)
Installation Manual Installation -Clearances for sidewall terminationsImproper installation can result in carbon monoxide poisoning or death. Follow all local and national codes in regards to proper termination clearances. In the absence of such codes, the clearances below can be used as guidelines. Local codes supersede these WARNING guidelines. Exhaust Termination 2 ft (610 mm) min. 1 ft (305 mm) min. 1 ft (305 mm) min.
Installation Manual Installation -Clearances for rooftop terminationsFollow all local and national codes in regards to proper termination clearances. In the absence of such codes, the clearances below must be met. Local codes supersede these clearances. WARNING Failure to observe this warning may result in severe personal injury or death. Canadian requirements differ from the guidelines in this section. In Canada, follow the requirements of B149.
Installation Manual Installation GAS SUPPLY AND GAS PIPE SIZING -General• Do not use this water heater with any gas other than the one listed on the rating plate. • Ensure that any and all gas regulators used are operating properly and providing gas pressures within the specified range shown below. Excess gas inlet pressure may WARNING cause serious accidents. • Conversion of this unit from natural gas to propane or vice versa will void all warranty.
Installation Manual Installation -Natural gas supply piping- Maximum delivery Capacity in Cubic Feet of Gas per Hour (based on IPS Pipe carrying Natural Gas with 0.60 Specific Gravity with a Pressure Drop of 0.5" W.C.). Based on Energy Content of 1,000 BTU/Cubic ft: The water heater requires 160 Cubic ft/hr for the 240 model, 180 Cubic ft/hr for the 340 model, and 199 Cubic ft/hr for the 540 model. Unit: Cubic feet per hour The following tables are from NFPA 54.
Installation Manual Installation WATER CONNECTIONS WARNING NOTICE Do not use this appliance if any part has been under water. Immediately contact a qualified installer or service agency to replace a flooded water heater. Do not attempt to repair the unit! It must be replaced! Do not reverse the hot outlet and cold inlet connections to the water heater. This will prevent the water heater from activating properly.
Installation Manual Installation CONDENSATE DRAIN • The water heater does not include a built-in condensate neutralizer cartridge for reducing the pH level of condensate water. If local codes dictate that condensate must be neutralized prior to drainage, a condensate neutralizer must be installed. An accessory Neutralizer assembly (100112159/TH-NT01) is sold separately. (Refer to p. 10.
Installation Manual Installation Installation without neutralizer Installation with neutralizer 1/2" MPT Condensate connection 1/2" Condensate drain tube* 1/2" Condensate drain tube* Overflow bypass* (1/2" Condensate drain tube) 1/2" MPT Condensate connection 1/2" Condensate drain tube* 1/2" MPT x 3/8" FPT (Included with Neutralizer accessory) Neutralizer cartridge (Included with Neutralizer accessory) 1/2" FPT x 1/2" HB (Included with Neutralizer accessory) 1/2" Condensate drain tube* 2" (50 mm) MIN
Installation Manual Installation ELECTRICAL CONNECTIONS • WARNING • • Follow the electrical code requirements of the local authority having jurisdiction. In the absence of such requirements, follow the current edition of the National Electrical Code ANSI/NFPA 70 in the U.S. or the current edition of CSA C22.1 Canadian Electrical Code Part 1 in Canada. When servicing or replacing parts within the water heater, label all wires prior to disconnection to facilitate an easy and error-free reconnection.
Installation Manual Installation TEMPERATURE REMOTE CONTROLLER • • -Included accessories-Outdoor models only The remote control is an optional accessory that can be installed in a hall, closet, etc., to allow for temperature adjustment without having to go to the heater. When installed, the remote will take priority over the built-in controller of indoor models. Verify that the items listed below are included with the remote controller.
Installation Manual Installation 4. Tighten the two Fork terminals beneath the two Remote controller terminal screws on the back of the main body. (Fig. D-1) 5. Cut out the inlet for the remote controller cable from the bottom of the main body. (Fig. D-2) 6. Place the Main body back on the Back plate, with the Remote controller cable running out of the bottom inlet. Fig. D-1 Remote controller terminals Fig.
Installation Manual Installation EASY-LINK SYSTEM (540 model only) The 540 model water heaters can combine with the following approved heaters with communication cables to work as a multiple-unit manifold system. • The built-in Easy-Link System allows up to 4 units to manifold together. • A communication cable (gray color) comes with each 540 model. You can manifold from 2 to 4 units without the need for a multi-unit controller.
Installation Manual Installation 5. Between the “PARENT” and the “CHILD-1” units: Connect the “PARENT” connector of the “PARENT” unit to the “1” connector of the “CHILD-1” unit using the supplied linking cable. 6. Between the “CHILD-1” and the “CHILD-2” units: Connect the “2” connector of the “CHILD-1” unit to the “1” connector of the “CHILD-2” unit. 7. Between the “CHILD-2” and the “CHILD-3” units: Connect the “2” connector of the “CHILD-2” unit to the “1” connector of the “CHILD-3” unit. 8.
Installation Manual Installation MULTI-UNIT SYSTEM Multiple 540 models can be combined for a Multi-Unit System, along with the multi-unit controller (Part 100112691 (TM-MC02)). The multi-unit controller can control from 2 units to 20 units for commercial or residential applications. For a 20-unit system, the computer can modulate between the usages of 13,000 BTU/h (Propane) or 15,000 BTU/h (Natural gas) to 3.98 Million BTU/h.
Installation Manual Applications APPLICATIONS WARNING -Space-heating applications- • This water heater is suitable for combination water (potable) heating and space heating and not suitable for space heating applications only. • In order to purge air in water pipes within a closed-loop system, an air vent and air separator should be installed in the system. Required circulation flow rates are labeled next to each application diagram. These flow rate requirements must be followed.
Installation Manual Installation -Dual-purpose hot water heating(Domestic and Space Heating): Diagrammatic layout of radiant heating and domestic water heater. All water piping should be insulated in accordance with 780 CMR (Massachusetts energy code) Atmospheric vacuum breaker Thermostatic mixing valve Heating Coil (used with air-handler) Check valves 50’-0” maximum distance from water heater to fan coil.
Installation Manual Initial operation INITIAL OPERATION FOR YOUR SAFETY, READ BEFORE OPERATING • Check the GAS and WATER CONNECTIONS for leaks before firing unit for the first time. • Open the main gas supply valve to the unit using only your hand to avoid any spark. Never use tools. If the knob will not turn by hand, do not try to force it; call a qualified service technician. Forced repair may result in a fire or explosion due to gas leaks.
Owner's Guide Operating Safety Owner's Guide CONGRATULATIONS Congratulations and thank you for choosing our tankless water heater. Before use, we recommend that you read through this owner's guide carefully. Keep this manual for future reference. If you need an additional manual, contact the manufacturer or your local distributor. When you call, please tell us the product name and the serial number of your unit written on the rating plate of the water heater.
Owner's Guide Operating Safety OPERATING SAFETY FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand. B. BEFORE OPERATING smell all around the appliance area for gas.
Owner's Guide Operating Safety DANGER Vapors from flammable liquids will explode and catch fire causing death or severe burns. Do not use or store flammable products such as gasoline, solvents or adhesives in the same room or area near the water heater. Flammable Vapors FLAMMABLES Do not install water heater where flammable products will be stored or used unless the main burner is at least 18” above the floor. This will reduce, but not eliminate the risk of vapors being ignited by the main burner.
Owner's Guide Normal Operation NORMAL OPERATION BUILT-IN CONTROLLER AND REMOTE CONTROLLER The illustration below shows an example of the controllers. The exact display may differ from examples. Remote controller Built-in controller Display for Temperature When the STAND BY LED is ON, the hot water temperature will be displayed. "INFO" Button Each time the button is pressed, the operation mode is selected in the sequence of the following.
Owner's Guide Normal Operation OUTLET WATER TEMPERATURE SETTING -Set temperature Screen on the controller Operation Built-in controller 1. Turn on the 120 VAC power supply to the unit (the water heater or the multi-unit controller). 2. Press the "ON/OFF" button on the controller in order to turn the controller on. 3. When ON, the STAND BY LED is lit. 4. It shows the set temperature on its display as shown in the picture on the right. (EX.: 120 °F) Remote controller (EX.
Owner's Guide Normal Operation ADDITIONAL FEATURES -Information mode- You can get some information about the water heater condition by pressing the "INFO" button. For more information, follow the procedures below: INFO Button 1st. press 2nd. press 3rd. press 4th. press Screen on the controller Operation Built-in controller Inlet water temperature will be displayed on the controller by pressing the "INFO" button.
Owner's Guide Normal Operation TEMPERATURE SETTINGS ON THE PCB (WITHOUT REMOTE CONTROLLER) • • WARNING • Adjust the appropriate DIP switches according to model and temperature as shown below. DO NOT adjust the other DIP switches. Turn off the power supply to the water heater before changing the DIP switch settings. Failure to observe these warnings could lead to carbon monoxide poisoning, severe personal injury, or death.
Owner's Guide Normal Operation FREEZE PROTECTION SYSTEM • This water heater comes equipped with heating blocks to protect it from damage associated with freezing. When the freeze protection thermostat senses air temperature below 36.5 °F (2.5 °C), the blocks will heat up to prevent freezing of the unit. • To operate these freeze protection systems, there has to be electrical power to the unit. Damage to the heat exchanger caused by freezing temperatures due to power loss is not covered under the warranty.
Owner's Guide Normal Operation -Measuring inlet gas pressure1. Turn off all electric power to the water heater if service is to be performed. 2. Turn the manual gas valve located on the outside of the unit to the off position. 3. Failure to follow these steps could lead to fire or explosion, resulting in personal injury or death. WARNING The water heater cannot perform properly without sufficient inlet gas pressure. Below are instructions on how to check the inlet gas pressure.
Owner's Guide Troubleshooting TROUBLESHOOTING GENERAL PROBLEM SOLUTIONS TEMPERATURE and AMOUNT OF HOT WATER It takes a long time to • get hot water at the fixtures. • The water is not hot • enough. • • • • • The water is too hot. • The hot water is not • available when a • fixture is opened. • • • • The hot water turns cold and stays cold. Fluctuation in hot water temperature. WATER HEATER Unit does not ignite when water goes through the unit.
BUILT-IN CONTROLLER AND REMOTE CONTROLLER Owner's Guide Troubleshooting PROBLEM SOLUTIONS Controller does not display anything when the power button is turned on. • Make sure the unit is supplied with power. • Make sure the connection to the unit is correct. (pp. 35 and 36) NOTICE: When the unit has not operated for five minutes or more, the display of the controllers turns off to conserve energy. Built-in controller EASY-LINK SYSTEM 540 model only An ERROR code is displayed.
Owner's Guide Troubleshooting -Single unit Installation- Example: If your unit has a “321” error code (which signifies an inlet thermistor failure) • Indicator on the built-in controller or remote controller : “321” will be displayed on the screen. Error code • Green LED on the computer board: The green LED on the computer board will indicate this code with two flashes every 1/2 second. The pattern will repeat with a three second delay between patterns.
Owner's Guide Troubleshooting Outdoor model installation Indicator on the remote controller of Parent unit (If it is installed): “321” and "2" will alternately flash on the display. No. 2 Unit: The green Unit #1 Unit #2 Unit #3 Unit #4 LED on the computer PARENT CHILD CHILD CHILD board will indicate this code with two flashes every 1/2 second. No. 3&4 Unit: No sign.
Owner's Guide Troubleshooting Controller 331 341 391 441 510 551 611 651 661 701 711 721 Green LED Malfunction description Two Flashes Two Flashes Outlet thermistor failure (540 model only) • Exhaust thermistor failure (Indoor models only) Air-fuel ratio rod fail- • Two Flashes ure Flow sensor failure • Two Flashes (Easy-Link System only) Six Flashes Six Flashes Four Flashes System only) Bypass valve fault Four Flashes (540 model only) One Flash One Flash Six Flashes N/A 751 N/A 761 N/A 991 A
Owner's Guide Components Diagram COMPONENTS DIAGRAM Case assembly Outdoor models Indoor models 052 052 003 007 004 713 052 001 004 717 002 001 702 704 006 702 008 005 052 052 704 050 002 050 Temperature controller Temperature remote controller Indoor models 723 724 056 722 57 Page
Owner's Guide Components Diagram Computer board assembly 240 and 340 models 540 model 709 701 711 701 711 708 708 714 713 713 403 714 103 721 709 103 402 402 402 408 407 707 061 722 715 402 721 707 722 716 716 Surge box assembly 121 703 713 703 706 58 Page 053 709 063 715
Owner's Guide Components Diagram Burner assembly Burner assembly 101 104 115 053 053 709 108 107 401 106 116 053 110 062 109 111 711 Manifold assembly 112 117 053 114 102 103 105 113 065 708 054 150 121 119 711 707 062 151 057 055 055 117 063 051 719 540 model 714 59 118 Page
Owner's Guide Components Diagram Water Way assembly 418 413 453 452 F 412 058 458 462 472 064 473 418 468 473 462 458 462 415 064 E 458 451 B A E D 414 466 466 470 540 model 053 F 459 454 411 401 451 D 451 415 718 458 458 152 471 468 467 153 455 414 416 414 463 C 450 240 and 340 models 464 465 009 052 455 463 469 456 460 052 458 456 460 462 B Bypass section (540 model) D C 403 458 A 402 461 458 404 454 408 052 462 417 409 052 455 410 W
Owner's Guide Parts List PARTS LIST Item # 001 002 003 004 005 006 007 008 009 050 051 052 053 054 055 056 057 058 059 060 061 062 063 064 065 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 Part # Description Case assembly for Indoor models for Outdoor models Front cover for 240 and 340 Indoor for 240 and 340 Outdoor for 540 Indoor for 540 Outdoor Intake air port assembly Bracket Junction box Power supply cord assembly Back guard panel Chamber fixing plate Condensate drain port Truss screw
Owner's Guide Parts List Item # 116 117 118 119 121 150 151 152 153 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 450 451 452 453 454 455 456 457 458 459 460 461 Part # Description Pressure port Combustion chamber tube Gas inlet Gas inlet ring Surge box plate O-ring P18 NBR (Black) O-ring P20 NBR (Black) Silicon ring for Outdoor models Exhaust port for Outdoor models Primary heat exchanger assembly for 240 and 340 models Primary heat exchanger assembly for 540 model Flow adjustme
Owner's Guide Parts List Item # 462 463 464 465 466 Part # Description 714 715 716 717 718 719 721 722 723 Fastener “16-25A” Fastener “6-15” Flat heater Drain tube Cold pipe for 240 and 340 models for 540 model Stainless heat exchanger out pipe Header connection Drain port Thermistor fixing plate Exhaust thermistor gasket Hi-limit switch for exhaust Gasket Computer board for 240 model for 340 model for 540 model Rubber grommet Surge box 120 VAC wire for Indoor models for Outdoor models 120 VAC Power ON-
Owner's Guide Output Temperature Chart OUTPUT TEMPERATURE CHART Chart is based on properly sized gas line 240 model Output Temperature vs. GPM (Max. 6.6 GPM) with Various Inlet Water temperature Output Hot Water GPM (L/M) 40°F (4°C) Incoming temp. 60°F（16°C) 70°F（21°C) 15 4.0 2.0 0.0 40°F (4°C) 100 (38) 5.1 105 (40) 110 (43) 4.7 115 (45) 4.3 4.1 120 (50) 3.8 125 (52) 130 (55) 3.6 135 (57) 3.4 (17.7) (16.4) (15.3) (14.4) (13.5) (12.8) (12.1) 6.1 5.5 5.1 4.7 4.3 4.1 3.
