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CLICK ANYWHERE on THIS PAGE to RETURN to LOCHINVAR WATER HEATER INFORMATION at InspectApedia.com
On-Demand Water Heater
Installation Manual and Owner's Guide
ANSI Z21.10.3 ・ CSA 4.3
Gas Tankless Water Heater
Suitable for combination potable water heating
and space heating. Please refer to local codes for
space-heating compliance.
• ENDLESS HOT WATER
• ON-DEMAND USAGE
• COMPACT, SPACE SAVING
• ENERGY CONSERVATION
• COMPUTERIZED SAFETY
• NO PILOT LIGHT
• Complies with SCAQMD Rule
1146.2 for natural gas Low NOx
Emissions of 14 ng/J or 20 ppm.
• EASY-LINK SYSTEM (540H only)
• MULTI-UNIT SYSTEM (540H only)
Keep this manual near the water heater for future reference whenever maintenance, adjustment, or
service is required.
R
D
R
Models
140H
240H
340H
540H
TM
FEATURING
540H only
If the information in these
instructions is not followed
exactly, a fire or explosion may
result causing property damage,
WARNING
personal injury or death.
- 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 electric switch; do not
use any phone in your building.
• Immediately call your gas supplier from
a neighbor's 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 the
gas supplier.
If you have any questions, please call
or write to:
In the United States
500 Tennessee Waltz Parkway
Ashland City, TN 37015
Toll Free: 1-877-737-2840
In Canada
599 Hill Street West
Fergus, ON N1M 2X1
1-888-479-8324
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Table of Contents
Related Manuals for Lochinvar 540H
Summary of Contents for Lochinvar 540H
- Page 1 CLICK ANYWHERE on THIS PAGE to RETURN to LOCHINVAR WATER HEATER INFORMATION at InspectApedia.com On-Demand Water Heater Installation Manual and Owner’s Guide ANSI Z21.10.3 ・ CSA 4.3 540H only Models If the information in these instructions is not followed 140H...
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Page 2: Table Of Contents
Contents CONTENTS Installation Manual Owner's Guide SPECIFICATIONS ..........4 OPERATING SAFETY ........47 INTRODUCTION ..........5 NORMAL OPERATION ........49 SAFETY GUIDELINES........6 BUILT-IN CONTROLLER SAFETY DEFINITION ........6 AND REMOTE CONTROLLER ....49 GENERAL ............6 GENERAL ............49 INSTALLATION ..........7 OUTLET WATER TEMPERATURE GENERAL ............7 SETTING .............50 CLEARANCES ..........9 TEMPERATURE TABLE OF CONTROLLER .50 INCLUDED ACCESSORIES ......9... -
Page 3: Installation Manual
Installation Manual 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. -
Page 4: Specifications
Installation Manual Specifications SPECIFICATIONS 140H 140H 240H 240H 340H 340H 540H 540H Indoor Outdoor Indoor Outdoor Indoor Outdoor Indoor Outdoor Model (AT-H3M (AT-H3M (AT-H3J (AT-H3J (AT-H3S (AT-H3S (AT-H3 (AT-H3 -DV) -OS) -DV) -OS) -DV) -OS) -DV) -OS) Natural Gas Input Min.: 15,000... -
Page 5: Introduction
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/front panel of the water heater. •... -
Page 6: Safety Guidelines
Installation Manual Safety Guidelines SAFETY GUIDELINES SAFETY DEFINITION Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. DANGER Indicates an imminently hazardous situation which, if not avoided, could result in death or serious injury. WARNING Indicates an imminently hazardous situation which, if not avoided, could result in minor or moderate injury. -
Page 7: Installation
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. - Page 8 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.
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Page 9: Clearances
Check that these items below are included with the water heater. Temperature remote controller kit Installation manual Bird screen Communication cable Outdoor models only and owner’s guide Indoor models only 540H model only (Refer to pp. 10 and 35.) Qty: 1 Qty: 1 Qty: 2 Qty: 1 100209924 (TM-RE42) 100282480... - Page 10 Installation Manual Installation 1. Temperature remote controller: 2. Pipe cover: 100112718 (TH-PC03) for 240H/340H/540H 100209924 (TM-RE42) 100187904 (TH-PC04) for 140H The temperature remote controllers have The pipe cover protects the plumbing three functions. It allows the output pipes to the water heater from temperature from the water heater unexpected adjustments.
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Page 11: Warning For Installations
Installation Manual Installation WARNING FOR INSTALLATIONS FOR YOUR SAFETY, READ BEFORE INSTALLATION: Do not install the heater where water, debris or Do not have the vent terminal pointing toward flammable vapors may get into the flue terminal. any opening into a building. Do not locate This may cause damage to the heater and void your heater in a pit or location where gas and the warranty. -
Page 12: High-Altitude Installations
ON 1 2 3 4 5 6 ON 1 2 3 4 5 6 ON 1 2 3 4 5 6 ON 1 2 3 4 5 6 540H (Lower bank of No. 2 : OFF No. 2 : OFF No. -
Page 13: Venting Instructions
Installation Manual Installation VENTING INSTRUCTIONS • 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. -
Page 14: Vent Termination Clearances
Installation Manual Installation -Vent termination clearances- Inside Legend: corner detail = Vent terminal = Air supply inlet = Area where terminal is not permi�ed 15 � Fixed Operable closed Fixed closed Operable Regulator vent outlet In the event no regulator is present, H and I can be disregarded Canada Installations US Installations... -
Page 15: Clearances For Sidewall Terminations
Installation Manual Installation -Clearances for sidewall terminations- Improper 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 guidelines. WARNING Multiple Sidewall Terminations An exhaust termination must be at least... -
Page 16: Clearances For Rooftop Terminations
Installation Manual Installation -Clearances for rooftop terminations- Follow 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. Failure to observe this warning may result in severe personal injury or death. WARNING Canadian requirements differ from the guidelines in this section. -
Page 17: Combustion Air Supply
Installation Manual Installation -Combustion air supply- This 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. - Page 18 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. : If you are replacing your old water heater with one that has a higher BTU/h rating, the amount of NOTICE ventilation required may be greater.
- Page 19 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 illustra- tions on the next page. 1. Direct to outdoors 2. Vertical ducts 3. Horizontal ducts-Single opening (not recommended; must be at least 100 in (645 cm ) .
- Page 20 Installation Manual Installation Combustion air supply options Gable vent to outdoors Install above insulation 12” (305 mm) Outlet air to Confined maximum attic 1 in (6.5 cm Space per 4,000 btu/h Two permanent Openings Confined Alternate Inlet air from 1 in (6.5 cm Space Air Inlet...
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Page 21: Exhaust Vent (Abs,Pvc,Cpvc, Or Polypropylene Vent)
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. -
Page 22: Dip Switch Settings For Vent Length (Abs,Pvc,Cpvc, Or Polypropylene Vent)
Installation Manual Installation -DIP switch settings for vent length- PVC, CPVC, ABS, or polypropylene vent Typical installations using • Adjust the appropriate DIP switches according to model and vent length as shown below. DO NOT adjust the other DIP switches. •... - Page 23 • Turn off the power supply to the water heater before changing the DIP switch settings. WARNING • Failure to observe these warnings could lead to carbon monoxide poisoning or death. 140H/240H/340H 540H Upper bank of DIP switches Lower bank of...
- Page 24 ON 1 2 3 4 5 6 7 8 ON 1 2 3 4 5 6 7 8 ON 1 2 3 4 5 6 7 8 540H Indoor (Upper bank of No. 3 : OFF No. 3 : O N No.
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Page 25: Exhaust Vent (Stainless Steel Vent)
Installation Manual Installation <How to remove 3" PVC adapter from the intake/exhaust collar> 3" adapter* 3" adapter* Remove the 3" adapter when using vent material Intake vent collar (Female) Exhaust vent collar other than PVC or CPVC. Screws (Female) 1. Remove each screw from 3" adapter to detach the adapters from each vent collar. -
Page 26: Dip Switch Settings For Vent Length (Stainless Steel Vent)
For details on the vent components, refer to the vent manufacturer’s instructions. DIP switch settings : Single pipe and Direct vent installations / Vent diameter : 4" venting 140H/240H/340H Indoor 540H Indoor (Upper bank of DIP switches) Vent length 5 to 50 ft (1.5 to 15.2 m) 51 to 100 ft (15.3 to 30.5 m) - Page 27 Installation Manual Installation • Follow the clearances listed on pages 11, 14-16 when installing the vent and air intake terminations. • Follow the vent manufacturer’s installation instructions and clearance requirements. • Use 4" Category III/IV approved or Special BH, single or double wall stainless steel vent pipe, listed to UL 1738.
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Page 28: Common Venting System
• 240HX3/340HX3/540HX3 models do not have Easy-Link or Multi-Unit capability. • 140H Indoor models are not approved for common venting. Allowable models for common-venting 240H, 340H, 540H, 540P, CT-199, 240HX3, 340HX3, 540HX3 Only the models listed in the table above can be common-vented together. Other models cannot be common-vented. - Page 29 • Turn off the power supply 20 ft (6.1 m) to the water heater before 100 ft (30.5 m) changing the DIP switch set- 100 ft (30.5 m) 540H Indoor tings. (Upper bank of 85 ft (25.9 m) • Failure to observe these DIP switches)
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Page 30: Gas Supply And Gas Pipe Sizing
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. -
Page 31: Natural Gas Supply Piping
Based on Energy Content of 1,000 BTU/Cubic ft: The water heater requires 120 Cubic ft/hr for the 140H model, 160 Cubic ft/hr for the 240H model, 180 Cubic ft/hr for the 340H model, and 199 Cubic ft/hr for the 540H model. -
Page 32: Water Connections
• The discharge capacity must be at least 120,000 BTU/h for the 140H model, 160,000 BTU/h for the 240H model, 180,000 BTU/h for the 340H model, and 199,000 BTU/h for the 540H model. • The pressure relief valve needs to be rated for a maximum of 150 psi (1 MPa). -
Page 33: Condensate Drain
Installation Manual Installation CONDENSATE DRAIN This high efficiency water heater produces acidic condensate that must be properly drained per local codes. The water heater does not have a built-in neutralizer to raise the pH level. A neutralizer is available from the water heater manufacturer, if needed. - Page 34 Installation Manual Installation Installation Installation without neutralizer with neutralizer 1/2" MPT 1/2" MPT Condensate connection Condensate 1/2" 140H Condensate connection Condensate 1/2" Condensate drain tube* drain port*** drain tube* 1/2" MPT x 3/8" FPT (Included with Neutralizer accessory) 1/2" Overflow bypass* Condensate (1/2"...
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Page 35: Electrical Connections
3. A green screw is provided in the junction box to ground the connection. 4. The water heater can be hardwired or wired to a plug-in. 5. The use of a surge protector is recommended in order to protect the water heater from power surges. 140H 240H/340H/540H Outdoor Outdoor Connect... -
Page 36: Temperature Remote Controller
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 tempera- • ture adjustment without having to go to the heater. When installed, the remote will take priority over the built-in controller of indoor models. - Page 37 * Do NOT jump or short-circuit the cables, or computer will be damaged. 7. Replace the front cover securely. Fig. E-1 140H/240H/340H models 100209924 (TM-RE42) Fig. E-2 Connect other end to these terminals 540H model 100209924 (TM-RE42) Connect other end to these terminals Page...
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Page 38: Easy-Link System
NOTICE • The 540H model cannot be combined together with other models not listed on the table above. • A 540P model only can be connected to 540H models where the 540P is the PARENT unit in the system. • When a 540H model is connected to other models listed above in an Easy-Link System, contact the manufacturer. - Page 39 No. 6 ON • To change the DIP switch settings for the Easy-Link System, locate the lower bank of DIP switches at the bottom left of the computer board of 540H. • DO NOT adjust any other DIP switches .
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Page 40: Multi-Unit System
• DIP switch settings: Default position (It does not need adjustment.) • This is the connection diagram for a 540H model and a multi-unit controller in the Multi-Unit System. The example above shows three water heaters. • The multi-unit controller automatically allocates the unit # (1-20) to each water heater in the Multi-Unit System. -
Page 41: Applications
Head loss of each model at 3 gpm, 140H/240H/340H models: 13.4 feet (5.8 psi) 540H models: 8.8 feet (3.8 psi) • The pump should be controlled by a field supplied aquastat with immersion probe and an adjustable differen- tial. -
Page 42: Domestic And Space Heating
At 3.5 gpm (13.2 l/m), the pressure drop of the water heaters are: 140H: 15.2 feet (6.6 psi) 240H & 340H: 13.8 feet (6.0 psi) 540H: 11.8 feet (5.1 psi) • Water tubing size, length, and material. Refer to the water tubing manufacturer for pressure drop informa- tion as it differs from one material to the next and at different sizes. - Page 43 Installation Manual Applications Below is a suggested piping layout. The installer must properly install the system per manufacturers instructions and local codes. LEGEND THERMOSTATIC MIXING VALVE TEMPERED HOT WATER TO FIXTURE PRESSURE RELIEF VALVE CIRCULATION PUMP BALL VALVE CHECK VALVE COLD BUILDING RETURN...
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Page 44: Dual-Purpose Hot Water Heating
Installation Manual Applications -Dual Purpose Water Heating for the State of Massachusetts- Diagrammatic layout of radiant heating and domestic water heater. The recirculation pump is to provide no less than 2 GPM (7.5 L/min) and no more than 4 GPM (15 L/min) through each activated unit in the system All water piping should be insulated in accordance with 780 CMR... -
Page 45: Initial Operation
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;... -
Page 46: Owner's Guide
Owner's Guide Owner's Guide 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. -
Page 47: Operating Safety
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. - Page 48 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. Do not install water heater where flammable products will be stored or used unless the main burner is at least 18”...
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Page 49: Normal Operation
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. 140H built-in controller display is same orientation as remote controller image as shown below. Built-in controller Remote controller Display for Temperature... -
Page 50: Outlet Water Temperature Setting
For 140H, 240H and 340H models °F 100 105 110 115 120* 125 130 135 140 °C b) For 540H model °F 100 105 110 115 120* 125 130 135 140 145 150 155 160 °C *Factory setting (Default): 120 °F... -
Page 51: Additional Features
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: Screen on the controller INFO Operation Button Built-in controller Remote controller Inlet water temperature will be Inlet water temperature 1st. -
Page 52: Temperature Settings On The Pcb
GPM (US) L/min GPM (30 L/min) for the 340H model, and 10.0 GPM (38 L/ Lavatory Faucet min) for the 540H model. Bath Tub 4.0 – 10.0 15.2 - 37.8 • The flow rate capacity of the water heater will vary based on... -
Page 53: Freeze Protection System
• The 540H Indoor model briefly fires on for about 3 seconds to provide freeze protection around the heat exchanger drum - Automatic firing system. Once 5 minutes have elapsed since the 540H Indoor previous firing operation, the computer will continually check the temperature of the exhaust thermistor. -
Page 54: Maintenance And Service
Owner's Guide Maintenance and service MAINTENANCE AND SERVICE • Turn off the electrical power supply and close the manual gas shutoff valve and the manual water control valve before servicing. • Failure to do so could result in severe personal injury, or death. WARNING The following maintenance is required for the proper operation of water heaters. -
Page 55: Unit Draining & Power Outage (Freeze Protection)
Unscrew this drain plug to drain the water line as well. 8. Securely screw the drain plugs back into place. Hand- tighten only. 140H 240H/340H/540H Drain plug Drain plug with Filter (Large) -
Page 56: Measuring Inlet Gas Pressure
Press the MIN button on the computer board. (Refer to the diagrams below.) Take a supply gas pressure reading and verify that it is within the specified inlet gas pressure range. 140H/240H/340H 540H MIN button MAX button MIN button... -
Page 57: Troubleshooting
Owner's Guide Troubleshooting TROUBLESHOOTING PROBLEM SOLUTIONS It takes a long time to • The time it takes to deliver hot water from the water heater to your fixtures get hot water at the depends on the length of piping between the two. The longer the distance or fixtures. -
Page 58: Error Codes
The green LED on the computer board will flash in a pattern shown on the next page. • Consult the table on the following pages for the description of each error code. 140H/240H/340H 540H Error code indicator on the built -in temperature controller Green LED... -
Page 59: Single Unit Installation
3 sec. off -Easy-Link System- (540H model only) Error codes will be displayed differently with units installed in an Easy-Link System. The built-in/remote con- troller installed in a PARENT unit will show both the error code and which unit has the error code. Below is an example of how an error code of "321"... -
Page 60: Fault Analysis Error Code
• Ensure that any horizontal drain line runs are sloped downward. Removal any sags in the drain line. 311* 140H/240H/340H: Outlet Thermistor Failure Flashes 540H: Heat Exchanger • Check for connection/breakage of wires and/or debris on thermistor (Part Thermistor Failure #407, 408, 411, 715). 321* Inlet thermistor failure Flashes *These error codes will be cleared when water flow stops. - Page 61 Owner's Guide Troubleshooting Controller Green Malfunction Diagnosis description 331* Outlet thermistor fail- ure (540H only) Flashes • Check for connection/breakage of wires and/or debris on thermistor (Part 341* Exhaust thermistor failure #407, 408, 411, 715, 718 721). (Indoor models only) Flashes...
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Page 62: Components Diagram
Owner's Guide Components Diagram COMPONENTS DIAGRAM Case assembly 140H Indoor 140H Outdoor Temperature Built-in controller remote controller 140H Indoor 140H 100209924 Page... - Page 63 Owner's Guide Components Diagram Computer board assembly Surge box assembly 140H 140H Indoor model Outdoor model Wiring diagram Indoor only Heater (for the secondary heat exchanger) Heaters (for the heat exchanger and water pipes) 140H (for the drain hose) (for the water pipes) (for the water inlet) Igniter rod (for the water outlet)
- Page 64 Owner's Guide Components Diagram Burner assembly 140H Burner assembly 111 711 Manifold assembly 055 063 Page...
- Page 65 Owner's Guide Components Diagram Water Way assembly 140H Indoor 140H Outdoor 425 471 472 065 450 053 for Indoor model 451 414 052 454 Water outlet section Water inlet section Page...
- Page 66 Owner's Guide Components Diagram Case assembly 240H/340H/540H Indoor 240H/340H/540H Outdoor Built-in controller 240H/340H/540H Indoor Surge box assembly 240H/340H/540H Temperature remote controller 240H/340H/540H Page...
- Page 67 Built-in controller �onal Valve Outlet thermistor MAX bu�on Inlet thermistor MIN bu�on Increase bu�on Decrease bu�on Remote controller Green LED DIP switches 540H Outdoor Only Heater Heater Igniter rod 540H Heater Heater Thermostat 540H Indoor Only Ground Heater Surge Flame rod...
- Page 68 Owner's Guide Components Diagram Burner assembly 240H/340H/540H Burner assembly 109 111 Manifold assembly 540H Page...
- Page 69 Owner's Guide Components Diagram Water Way assembly 240H/340H/540H 540H 240H/340H Bypass section 540H Water outlet section Water inlet section Page...
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Page 70: Parts List
Owner's Guide Parts list PARTS LIST Model Item # Description 140H 240H 340H 540H Case assembly Indoor Case assembly Outdoor Front cover Indoor 100074663 100074665 Front cover Outdoor 100074664 100074666 Intake air port assembly 100076311 100074667 Bracket Junction box 100074668... - Page 71 Flame rod 100074673 Igniter rod 100076318 100074222 Rod holder 100074221 Rod cap 100076319 100074223 Burner damper LP (240H/340H/540H) 100074674 Burner damper NA (240H/340H/540H) 100074675 Burner damper Indoor (140H) 100076320 Burner damper Outdoor (140H) 100076321 Manifold gasket A 100074229 Manifold gasket B...
- Page 72 Overheat-cut-off fuse 100074252 100074334 Pipe heater 100076325 100074682 Inlet heater for Indoor model 100076326 100074683 Inlet heater for Outdoor model (240H/340H/540H) 100074684 Drain plug detector assembly 100342423 Inlet heater 100074629 Secondary heat exchanger for Indoor model 100076507 100074700 Secondary heat exchanger for Outdoor model...
- Page 73 Switch wire with thermostat for Indoor model 100342431 Switch wire with thermostat for Outdoor model 100342432 Proportional gas valve wire 100074642 100074657 24V cables for 540H model 100074658 Computer board cover 100074375 Cable clamp for Indoor model Exhaust thermistor for Indoor model 100074316...
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Page 74: Output Temperature Chart
Owner's Guide Output Temperature Chart OUTPUT TEMPERATURE CHART These charts are based on properly sized gas lines and installation at 0-2,000 ft (0-610m). The water heater will de-rate approximately 4% per 1,000 ft (305 m) of elevation increase above 2,000 ft (914 m). To reduce the risk of scalding, install Thermostatic Mixing Valves (temperature limiting valves) at each point of use. - Page 75 (16.2) (30.3) (28.8) 70°（21°C) (30.3) (28.8) (25.9) (23.5) (21.6) (19.9) (18.5) (30.3) (30.3) 540H model Output Temperature vs. GPM (Max. 10.0 GPM) with Various Inlet Water temperature (L/M) 12.0 40°F（4°C) 50°F（10°C） 60°F（16°C) 70°F（21°C) 10.0 Set temp.°F(°C) (38) (40) (43) (45)
- Page 76 68A255-1 2000534710 (REV. F)