Rheem RTGH-RH11DV Use And Care Manual
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Rheem RTGH-RH11DV Use And Care Manual

Condensing tankless water heater
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NOTE TO CONSUMER: DO NOT DESTROY THIS MANUAL. PLEASE READ CAREFULLY AND KEEP ALL INSTRUCTIONS
FOR FUTURE REFERENCE.
The surfaces of these products contacted by consumable water contain less than 0.25% lead by weight, as
required by the Safe Drinking Water Act, Section 1417.
If the information in these instructions is not followed exactly, a fire or explosion may result, causing property damage, 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. To do so may result in
an explosion or fire.
•
Installation and service must be performed by a qualified installer, service agency, or the gas supplier.
•
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 neighbor's phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
• Do not return to your home until authorized by the gas supplier or fire department.
This water heater is not suitable for use in manufactured (mobile) homes.
Printed in the USA.
WARNING
FOR YOUR SAFETY!
WHAT TO DO IF YOU SMELL GAS
CONDENSING
WATER HEATER
Use and Care Manual
180,000 / 199,000 Btu/Hr Models
TANKLESS
User's Information
Installation
Start-Up
Maintenance
Parts
www.rhem.com
AP18733 REV. 3.2.17
1

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Questions and answers

napoleon gomez
February 18, 2025

I have a problem with my thanks list water heater is gas is not working properly the water is cold and hot cold and hot and sometimes it show code 10 and sometimes it doesn't show anything I check everything the menu said I cannot figure it out how can I get help the water heater is only a year old. The water heater is the RTGH RH11DV

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Summary of Contents for Rheem RTGH-RH11DV

  • Page 1 CONDENSING TANKLESS WATER HEATER Use and Care Manual User’s Information Installation Start-Up Maintenance Parts 180,000 / 199,000 Btu/Hr Models NOTE TO CONSUMER: DO NOT DESTROY THIS MANUAL. PLEASE READ CAREFULLY AND KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE. The surfaces of these products contacted by consumable water contain less than 0.25% lead by weight, as required by the Safe Drinking Water Act, Section 1417.
  • Page 2 SPECIAL ATTENTION BOXES The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels, or to important product information. DANGER DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. WARNING WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
  • Page 3 In some circumstances, the property owner or his/her agent assumes the role, and at government installations, the commanding officer or departmental official may be the AHJ. NOTE: Rheem reserves the right to modify product technical specifications and components without prior notice. ▪ FOR THE INSTALLER DANGER This manual must only be used by a qualified heating installer/service technician.

  • Page 4: Table Of Contents

    TABLE OF CONTENTS USER’S INFORMATION................................7 A. PRODUCT AND SAFETY INFORMATION........................7 1. BEFORE OPERATION..............................8 2. DURING OPERATION..............................8 3. TROUBLESHOOTING AND GENERAL CAUTIONARY STATEMENTS..............9 B. MAINTENANCE................................10 1. SERVICE TECHNICIAN.............................10 2. OWNER MAINTENANCE............................10 C. MAINTENANCE PROCEDURES..........................11 1. DAILY MAINTENANCE..............................11 2. MONTHLY MAINTENANCE............................11 3. 6 MONTH MAINTENANCE............................12 4.
  • Page 5 H. REMOVING A WATER HEATER FROM A COMMON VENT SYSTEM................25 I. UNPACKING THE WATER HEATER..........................25 J. WALL-MOUNTING THE WATER HEATER........................26 VENTING....................................27 A. INTAKE PIPE AND EXHAUST VENT GUIDELINES......................27 B. APPROVED VENT MATERIALS...........................30 C. ALLOWED SCHEDULE 40 VENT LENGTHS (PVC, CPVC, PP).................31 D.
  • Page 6 OPERATING SYSTEM INSTRUCTIONS..........................57 A. CONTROL PANEL................................57 B. LCD DISPLAY DESCRIPTIONS............................57 C. START-UP SEQUENCE..............................58 D. CHANGING THE DHW SET-POINT..........................58 E. STATUS DISPLAY MODE..............................59 F. CHANGING THE TIME...............................60 G. INSTALLER MODE................................61 H. USING RECIRCULATION MODES – STEP 1........................62 I. SETTING THE RECIRCULATION TIMER – USING RECIRCULATION MODES – STEP 2..........63 1.

  • Page 7: User's Information

    USER'S INFORMATION ▪ A. PRODUCT AND SAFETY INFORMATION WARNING USER – Have this water heater serviced/inspected by a qualified service technician annually. FAILURE TO ADHERE TO THE GUIDELINES IN THIS MANUAL CAN RESULT IN SUBSTANTIAL PROPERTY DAMAGE, SEVERE PERSONAL INJURY, OR DEATH. WARNING OPERATING INSTRUCTIONS 1.

  • Page 8: Before Operation

    ▪ 1. BEFORE OPERATION 1. Check the Gas Type (NG/LP) When operating the water heater for the first time, ensure the connected gas type matches that of the gas type of the water heater. Check whether the gas supplied is NG or LP. The water heater gas type is indicated on the rating plate on the side of the water heater. 2.

  • Page 9: Troubleshooting And General Cautionary Statements

    ▪ 3. TROUBLESHOOTING AND GENERAL CAUTIONARY STATEMENTS DO NOT use this water heater for any purposes other than those specifically described by Rheem (to provide domestic hot water). Using this water heater for unapproved purposes WILL VOID the warranty, and could result in property damage, serious personal injury, or death.

  • Page 10: Maintenance

    ▪ B. MAINTENANCE 1. SERVICE TECHNICIAN The following maintenance should be performed by a qualified service technician annually: General • Attend to any reported problems. • Inspect the interior of the water heater cabinet; clean and vacuum if necessary. • Clean the condensate trap and fill with fresh water. •...

  • Page 11: Monthly Maintenance

    Ensure the Water heater Cabinet is Closed Ensure the water heater cabinet is closed. Tighten the two upper and lower screws to secure it. The cabinet must be closed while the water heater is running. Check the Power Source Make sure the power cord is properly connected. The main power line is connected to the manual switch box inside the water heater. Check the Status of the Control Panel Observe the Control Panel to ensure the water heater is powered on, and to check for any error codes.

  • Page 12: Month Maintenance

    3. 6 MONTH MAINTENANCE Check Primary and Gas Piping • Remove the water heater cover and perform a gas leak inspection following Operating Instructions, page 2, this manual. If gas odor or leak is detected, follow procedures on page 2. Call a qualified service technician. •...

  • Page 13: Troubleshooting

    ▪ D. TROUBLESHOOTING To save time and money, review the following initial diagnostic steps before calling for service. Problem Possible Solution Make sure that the ON/OFF button on the Control Panel is ON If the display on the Control Panel is blank, make sure the power cord is plugged in and 3A fuses on the main controller in the water heater are good Make sure that the water heater is supplied with water.

  • Page 14: The Following Are Installation Instructions For The Contractor

    THE FOLLOWING ARE INSTALLATION INSTRUCTIONS FOR THE CONTRACTOR AP18733 REV. 3.2.17...

  • Page 15: Items Shipped With The Water Heater

    Rheem cannot anticipate every circumstance that might involve a potential hazard. Each installation has its own specialized characteristics, requirements, and possible hazards.

  • Page 16: Improper Combustion

    Certain local codes require additional temperature limits. In addition, certain types of systems may operate at temperatures below the minimum set point of the limit provided with the water heater. Contact Rheem for additional overheat controls.

  • Page 17: When Servicing The Water Heater

    Consider water heater piping and installation when determining water heater location. NOTE: Damages resulting from incorrect installation or from use of products not approved by Rheem ARE NOT covered by warranty. The water heater control is equipped with freeze protection that activates based on internal water temperature. See the table below for details on freeze protection operation.

  • Page 18: Scalding

    ▪ G. SCALDING DANGER Households with small children, disabled, or elderly persons may require 120 °F (49°C) or lower thermostat setting to prevent contact with “HOT” water APPROXIMATE TIME / TEMPERATURE RELATIONSHIPS IN SCALDS 120°F More than 5 minutes 125°F 1 ½...

  • Page 19: Specifications

    SPECIFICATIONS ▪ A. SPECIFICATIONS Model Name RTGH-RH11DV RTGH-RH10DV 199,000 Btu/h 180,000 Btu/h 18,000 Btu/h 18,000 Btu/h Gas Input Rate High Altitude 180,000 Btu/h 180,000 Btu/h (2,500~4,500ft) 35°F Rise 11.0 Gal 9.2 Gal Hot Water Capacity 45°F Rise 8.5 Gal 7.2 Gal 77°F Rise...

  • Page 20: Components

    ▪ B. COMPONENTS Name of Component Name of Component Main Controller Exhaust Outlet Collar ‘DHW’ Inlet Filter Ignition Trans ‘DHW’ Inlet Adapter Ignition Rod Gas Inlet Adapter Over-heating Switch Manual Power Switch Primary Heat Exchanger Water Flow Control Valve H/E Temperature Sensor Air Pressure Switch Secondary Heat Exchanger Flame Detection Sensor...

  • Page 21: Dimensions

    ▪ C. DIMENSIONS 11.5" [292mm] 4.6" [117mm] 2.6" [67mm] 3.2" [81mm] 6.8" [173mm] 10.2" [260mm] 13.6" [346mm] Figure 2 – Specifications and Dimensions DESCRIPTION DIAMETER Exhaust Outlet Pipe 3" (7.6 cm) Air Intake 3" (7.6 cm) DHW Outlet Adapter ¾" (1.9 cm) Condensate Adapter ½"...

  • Page 22: Prepare Water Heater Location

    The water heater should be located near a floor drain, or installed in proximity to an adequately drained drain pan. Rheem WILL NOT be held liable for leakage damages. To conserve water and energy, insulate all water piping, especially the hot and recirculation water lines.

  • Page 23: Leveling

    5. If the water heater is to replace an existing water heater, check for and correct any existing system problems, such as: • System leaks • Location that could cause the system and water heater to freeze and leak. • Incorrectly-sized expansion tank IMPORTANT Do not connect the water heater to any heating systems or components that have been previously used for non-potable applications.

  • Page 24: Exhaust Vent And Intake Pipe

    PRECAUTIONS If the water heater is located in a residential garage, it should be installed per the latest edition of the National Fuel Gas Code, ANSI Z223.1, and CGA-B149 Installation Code in Canada. • Mount the bottom of the water heater a minimum of 18" (457 mm) above the floor of the garage, to ensure the burner and ignition devices are well off the floor.

  • Page 25: Removing A Water Heater From A Common Vent System

    PRODUCTS TO AVOID AREAS LIKELY TO HAVE CONTAMINANTS Spray cans containing fluorocarbons Dry cleaning/laundry areas and establishments Permanent wave solutions Swimming pools Chlorinated waxes/cleaners Metal fabrication plants Chlorine-based swimming pool chemicals Beauty shops Calcium chloride used for thawing Refrigeration repair shops Sodium chloride used for water softening Photo processing plants Refrigerant leaks...

  • Page 26: Wall-Mounting The Water Heater

    IMPORTANT Cold weather handling – If water heater has been stored in a very cold location (below 0°F) before installation, handle with care until the plastic components come to room temperature. Remove all sides of the shipping crate to allow the water heater to be lifted into its installation location. ▪...

  • Page 27: Venting

    VENTING DANGER Vent this water heater in accordance with these instructions. Failure to do so will result in property damage, severe personal injury, or death. WARNING DO NOT mix vent systems or materials unless specifically told to do so in this manual. DO NOT thermally insulate the exhaust vent or intake pipes.
  • Page 28 WARNING All joints of positive pressure vent systems must be sealed completely to prevent leakage of flue products into living space. • Remove all burrs and debris from joints and fittings. • When using PVC or CPVC pipe, all joints must be properly cleaned, primed, and cemented. Use only cement and primer approved for use with the pipe material.
  • Page 29 Figure 6 - Vent Termination Detail Description Canadian Clearance above grade, veranda, porch, deck, or balcony 1 foot (30 cm) 1 foot (30 cm) Direct Vent 1 foot (30 cm) Clearance to window or door that may be opened 3 feet (91 cm) 1 foot (30 cm) above, or 4 feet (1.22 Power Vent m) below or to side of opening...

  • Page 30: Approved Vent Materials

    • When installing AL29-4C vent piping, install a PVC-to-stainless adapter at the water heater vent connection, and at the termination when using a Rheem PVC termination kit. DO NOT mix AL29-4C piping from different manufacturers unless using adapters specifically designed for the purpose by the manufacturer.

  • Page 31: Allowed Schedule 40 Vent Lengths (Pvc, Cpvc, Pp)

    ▪ C. Allowed Schedule 40 Vent Length (PVC, CPVC, PP) 1. Maximum Vent Length (Intake/outlet) Maximum length of 2" Maximum length of 3" Number of 90º elbows straight pipe straight pipe 0 or 1 50ft.(15.24m) 100ft. (30m) 42ft. (12.8m) 95ft. (29m) 34ft.

  • Page 32: Vent Termination

    Figure 8 – Transitioning from 3" (7.6 cm) to 2" (5.1 cm) Vent Pipe WARNING Do not use bushing to reduce vent size. Doing so could result in product damage, severe personal injury, or death. ▪ E. VENT TERMINATION 1. Direct Vent, Two Pipe Roof and Sidewall Vent Terminations Check Primary and Gas Piping ELBOW 12"...

  • Page 33: Direct Vent, Two Pipe Roof And Sidewall Vent Terminations

    *Stating tee fitting requires a screen at both ends. Figure 10 – Direct Vent, Vent Terminations (With Optional Kits) WARNING All vent pipes must be glued, properly supported, and the exhaust must be pitched a minimum of ¼" (0.6 cm) per foot back to the appliance to allow drainage of condensate.

  • Page 34: Power Venting, Indoor Combustion Air Installation In Confined Or Unconfined Space

    4. Power Venting, Indoor Combustion Air Installation in Confined or Unconfined Space NOTE: This water heater should be installed using direct venting in any instance where there are or may be flammable vapors in the area. FOR YOUR SAFETY Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. To do so may result in an explosion or fire.
  • Page 35 INDOOR COMBUSTION AIR (SINGLE PIPE) _HORIZIONTAL INSERT SCREEN IN EACH OPEN END OF TEE 1΄(30cm) 3"Min (7.5cm) MAINTAIN 12"(30cm) MINIMUM CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL OR GRADE, WHICHEVER IS GREATER. INDOOR COMBUSTION AIR (SINGLE PIPE)_Vertical INSERT SCREEN IN EACH OPEN END OF TEE ROOF FLASHING Figure 13 –...

  • Page 36: Common Vent Piping

    ▪ F. COMMON VENT PIPING DANGER Common Vented water heaters must be direct vented, with an exhaust vent and intake air pipe vented to the outdoors. DO NOT power vent Common Vented water heaters! Doing so will result in property damage, severe personal injury, or death. These water heaters can be common vented.

  • Page 37: Recommended Exhaust Pipe Transitions

    2. RECOMMENDED EXHAUST PIPE TRANSITIONS Figure 14 – Recommended Exhaust Pipe Transitions AP18733 REV. 3.2.17...

  • Page 38: Two Pipe Vent System (Direct Vent)

    3. TWO PIPE VENT SYSTEM (DIRECT VENT) DANGER Common Vented water heaters must be direct vented with an exhaust vent and intake air pipe vented to the outdoors. DO NOT power vent Common Vented water heaters! Doing so will result in property damage, severe personal injury, or death. The water heater can be direct vented without any modification using a 3 inch diameter pipe.
  • Page 39 Figure 16 –Common Vented Direct Vent Configurations WARNING All vent pipes must be glued, properly supported, and the exhaust must be pitched a minimum of ¼" per foot back to the appliance to allow drainage of condensate. When placing support brackets on vent piping, the first bracket must be within 1 foot of the appliance and the balance at 4 foot intervals on the vent pipe.

  • Page 40: Install The Condensate Drain

    INSTALL THE CONDENSATE DRAIN DANGER Common Vented water heaters must be direct vented, with an exhaust vent and intake air pipe vented to the outdoors. DO NOT power vent Common Vented water heaters! Doing so will result in property damage, severe personal injury, or death. NOTE: This drawing is meant only to demonstrate system venting.

  • Page 41: Lp (Liquid Propane) Gas Pipe Sizing

    Maximum Natural Gas Delivery Capacity – Length of Black Iron Pipe (Sch. 40 Metallic) in Feet Cubic Feet per Hour (0.60 Specific Gravity, 0.5 WC [0.12 kPa] Pressure Drop) Pipe size ½" (1.2 cm) ¾" (1.9 cm) 1" (2.5 cm) 1 ¼"...

  • Page 42: Gas Connection Requirements

    ▪ B. GAS CONNECTION REQUIREMENTS 1. The gas connection fitting on the water heater is ¾″ (1.9 cm) female NPT. NOTE: The pipe size must not be less than ¾″ (1.9 cm). 2. The supply line must be sized for the maximum output of the water heater being installed. If there are additional gas appliances from the main supply line, measure the size of the supply line according to the COMBINED total maximum BTUH draw for the appliances as if they were operating at the same time.

  • Page 43: Additional Precaution For Excess Flow Valve (Efv)

    Figure 20 – LP Gas Piping Installation – NOTE: Capacity to be Not Less than Total Capacity of Connected Appliances ▪ C. ADDITIONAL PRECAUTION FOR EXCESS FLOW VALVE (EFV If an excess flow valve (EFV) is in the gas line, check the manufacturer’s minimum and maximum flow capacity ratings.

  • Page 44: Water Piping

    If the readings obtained are lower or higher than the combustion readings in Table 19, use a 5m Allen key to adjust the offset screw in a clockwise (positive) or counterclockwise (negative) direction (approximately 1/4 turn). See Figure 23. Check your combustion values. Repeat this procedure until the values obtained on the combustion analyzer agree with those stated in Table 18.
  • Page 45 External Recirculation Mode – This mode keeps an external recirculation loop warm to make hot Standard (DHW) water production more Mode – This is the efficient and also aid in operating mode freeze protection. An when there is a call external recirculation line for hot water.

  • Page 46: Install A Backflow Preventer

    ▪ B. INSTALL A BACKFLOW PREVENTER It may be recommended to use a back flow preventer – check local codes. If a back flow preventer or a no return valve is used, a thermal expansion tank must be installed on the cold water supply between the water heater and valve. WARNING To control thermal expansion, a thermal expansion tank should be installed in systems with an installed backflow preventer.
  • Page 47 Standard Mode Air & Gas Mixing 1. Only POTABLE water may be plumbed through the water heater. Burner 2. The water heater cannot be used for space heating applications. Primary heat 3. Expansion tank is required if a backflow preventer is installed. exchanger 4.
  • Page 48 Preheat or Internal Recirculation Mode Air & Gas Mixing Preheat or Internal Recirculation Mode may Burner be used without an installed recirculation Primary heat pipe. The water heater is preheated and exchanger protected from freezing. Secondary heat exchanger Recirculation Pump Pressure Relief Valve Figure 27 –...

  • Page 49: Pressure Relief Valve

    Figure 29 – Pressure Drop through the Heat Exchanger RECOMMENDED WATER PIPE SIZE ∆T = 77°F (25°C) ∆T = 45°F (7.2°C) ∆T = 35°F (1.6°C) Number Water Water Flow Rate Pipe Flow Rate Flow Rate Pipe Flow Rate Pipe of units Velocity Velocity (GPM)

  • Page 50: Connect Electrical Power / Initial Startup

    Pressure relief valves must be installed as close to the water heater as possible. No other valves should be placed between the pressure relief valve and the appliance. DO NOT install a relief valve with a pressure rating greater than 150 psi (1,034 kPa). This is the maximum allowable relief valve setting for this water heater.

  • Page 51: Dip Switches

    Figure 31 – Proper Grounding – Internal Manual Power Switch 6. The wiring diagrams contained in this manual are to be used for reference purposes only. 7. Refer to these diagrams and the wiring diagrams of any external controls used with the installation when wiring the water heater. Read, under- stand, and follow all wiring instructions supplied with the controls.
  • Page 52 AP18733 REV. 3.2.17...
  • Page 53 AP18733 REV. 3.2.17...
  • Page 54 CONNECTOR DESCRIPTION HT SELV NO. OF LOCATION BOARD SILK EARTH GROUND Power Supply Line HT (120V~) Circulation Pump Igniter L(HT) UNUSED 65001WS-12 Gas Valve UNUSED Power Supply Neutral 9-12 AC Power COM Line RS485 + SELV (5V) RS-485 SMW250-03 RS485 - Unused SELV (30V) SELV (14V)
  • Page 55 CONNECTOR DESCRIPTION HT SELV NO. OF LOCATION BOARD SILK Flame Detect Sensor OP.S Operating Water Temperature Sensor DH.S DHW Temperature Sensor Inlet Water Temperature Sensor SELV (5V) LWD1140-14 Exhaust Temperature Sensor BG.S Optional Temperature sensor OT.S Unused SP.S AGM Stepper Motor Coil / Y Phase SELV (24V) CN12 AGM Stepper Motor Coil / X Phase...
  • Page 56 CONNECTOR DESCRIPTION HT SELV NO. OF LOCATION BOARD SILK Optional Push Button SELV(5V) Unused SMW250-06 FLUX1 Water Flow Sensor SELV (5V) Fan RPM Check SMW250-10 Table 23 – Water Heater Wiring 2 AP18733 REV. 3.2.17...

  • Page 57: Operating System Instructions

    ▪ OPERATING SYSTEM INSTRUCTIONS A. CONTROL PANEL Press This Button Less than 5 Seconds Cancel/Return Hold This Button More than 5 Seconds Press this Button Less than 5 When Control Panel Power is ON Seconds Change DHW set-Point status Display Mdoe Temperature 100-120°F (38-49°C) When Control Panel Hold this Button More than 5 Seconds...

  • Page 58: Start-Up Sequence

    DESIRED HOT WATER TEMPERATURE : 120 °F CURRENT TIME : AM 1:39 CURRENT DAY : MONDAY TIMER SETTING : MONDAY 5:00~6:30 , 18:00~20:00 Figure 34 – Example Display ▪ C. START-UP SEQUENCE After the appliance is powered ON, the LCD display shows a sequence of information. The icons will flash, followed by various indicators that describe the appliance controller and software versions.

  • Page 59: Status Display Mode

    Figure 35 – DHW Set-Point Screens Press the button when the display panel is powered ON to change the DHW Set-Point. The DHW icon and current set-point will display and flash. This indicates that the DHW Set-Point can be changed. Factory DHW Set-Point is 120°F(49°C). Initial DHW Set-Point range is 100 – 140°F (38 – 60°C).

  • Page 60: Changing The Time

    Parameter Detail Description Current Flow Unit A:Li or GA Flow Unit (Li: Liters/min, GA: Gallons/min) Fan Speed (RPM) Current Fan Speed RPM Value b:Fr Lock Mode is In Use (ON) or Unused (OFF) Lock Mode C:Lc Allows user to lock out any temperature change. d:Op Operating Temperature Current Heat Exchanger Operating Temperature...

  • Page 61: Installer Mode

    ▪ G. INSTALLER MODE Installer Mode will activate when button is pressed and held for five seconds while the water heater display is powered Off. Figure 38– Installer Mode Screens Index Default Parameter Description Allows the Installer to View the Unit Error History Error History 1:EH Range: E0:XX –...

  • Page 62: Using Recirculation Modes - Step 1

    Index Default Parameter Description Enables Cascade Mode on the water heater. Cascade 12:Cn Range: on – Cascade is used, oFF – Cascade is not used NOTE: 12:Cn must be set to On to select 13:Eh Enables Common Venting on the water heater. 13:Eh Common Vent Range: on –...

  • Page 63: Setting The Recirculation Timer - Using Recirculation Modes - Step 2

    4. Next, turn the dial to 7:RM. Press the Dial button. “ItnL” will flash when the 7:RM setting is ready to be changed. 5. Turn the dial to “Itnl” to turn on Internal Recirculation Mode, or “Etnl” to use External Recirculation, or “tt24” to use Title 24 application, or “bYPS”...

  • Page 64: Set The Recirculation Timer Type

    The following section details the various Recirculation Timer Functions. Step 1: Set the Recirculation Timer Type. Setting Detail Description Allows the installer to customize the Recirculation Function. The recirculation day and time values must be set in Step 2, SEt. When set in Smart Auto-Learn, the pump will run in Standard Mode for the first seven (7) days.

  • Page 65: Setting The Recirculation Run Time (Pro9 Recirculation Timer)

    ▪ 2. Setting the Recirculation Run Time (Pro9 Recirculation Timer) NOTE: This step is only necessary if “Pro9” was selected as the Recirculation Timer Type. If “Auto” was selected the water heater will automatical- ly program its recirculation operating patterns. a.

  • Page 66: Resetting The Recirculation Run Time

    f. Turn the dial . The start time on the screen will change in increments of thirty (30) minutes. When the desired start time appears on the screen, press the button to select and store it. Next, turn the dial until the desired end time appears on the display.

  • Page 67: Error Mode

    Figure 48 – Resetting the Recirculation Run Time d. The Recirculation Run Time has now been reset to the factory default settings. Press to return to Standby Mode. NOTICE If hot water is not used for more than thirty (30) hours, the recirculation program will be stopped and the water heater will automatically go into Vacation Mode and display the vacation icon ▪...
  • Page 68 Error Code Error Code Description Possible Remedies This Error Code will go away when the DHW temperature decreases. If Error happens again: 1. Check if dip switch High Fire setting is ON. Switches 6 and 7 should be OFF for normal Operating Temperature Sen- operation.
  • Page 69 Error Code Error Code Description Possible Remedies Press the Power button to clear the Error Code. If Error happens again: 1. Check the vent connections for blockages. Fan Speed too High with Er:41 2. Check the burner assembly. Flame On 3.
  • Page 70 Error Code Error Code Description Possible Remedies Press the Power button to clear the Error Code. If Error happens again: 1. Turn power OFF and ON at the main power switch internal to the water heater. 2. Ensure fan inlet hole is completely open after turning the power OFF and ON. Er:67 AGM Error 3.

  • Page 71: Flame Detection

    WARNING This water heater is equipped with a blocked vent shutoff system. If Error Codes Er:29, Er:41 or Er:94 occur, turn off the gas valve at the manual shutoff. Check the vent terminations for obstructions. If no obstructions are found, reset the water heater by pressing the power button. If the error continues to occur, call a qualified service technician or the gas supplier to check the water heater.

  • Page 72: Gas Detection

    2. GAS DETECTION Figure 51 – Gas Detection Error Analysis Tree 3. AIR PRESSURE SWITCH Figure 52 – Air Pressure Switch Analysis Tree AP18733 REV. 3.2.17...

  • Page 73: Inlet / Dhw / Operating Temperature Sensors

    4. Inlet / DHW / Operating Temperature SENSORS Figure 53 – Inlet / DHW / Operating Temperature Sensors Error Analysis Tree AP18733 REV. 3.2.17...

  • Page 74: Final Installation Checklist

    FINAL INSTALLATION CHECKLIST Is there enough space to ensure proper installation? Does installation location allow for proper service clearances? Are water and gas lines properly sized and set at proper pressures for the installation? BEFORE INSTALLING Is water heater location as near the exhaust vent / intake pipe terminations as possible? Have combustible materials been cleared from the installation location? Is there a drain close to the water heater? Does water heater loop piping meet the minimum sizing requirements listed?
  • Page 75 Visual check Port Port should show blue flame. Figure 54 – Flame Sight Glass DHW Inlet Temperature Sensor (7850P-015) Exhaust Temperature DHW Inlet Temperature Sensor (7850P-015) Exhaust Temperature Sensor (7850P-070) Sensor (7850P-070) Temperature (°F/ °C) Resistance (Ω) Temperature (°F/ °C) Resistance (Ω) Resistance (Ω) Resistance (Ω)

  • Page 76: Troubleshooting

    TROUBLESHOOTING TROUBLESHOOTING CHART PROBLEM POSSIBLE CAUSES POSSIBLE REMEDIES 1. Is the plug on the power supply cord unplugged from the 1. Reset the plug. electrical outlet? 2. Reset the circuit breaker. No electrical power to the 2. Is electrical panel’s 10 Amp circuit breaker tripped? 3.

  • Page 77: Maintenance Procedures

    Check for 120V at the line voltage terminal block Correct wiring inside the water heater cabinet using located inside the water heater cabinet the wiring diagram in the installation manual Replace the fuse with the proper part found in the Inspect the fuse.
  • Page 78 WARNING Failure to inspect the venting system and have it repaired by a qualified service technician can result in vent system failure, causing severe personal injury or death. Visually inspect the intake piping for any signs of blockage. Inspect the entire length of the intake pipe to ensure piping is intact and all joints are properly sealed.
  • Page 79 WARNING Have leaks fixed at once by a qualified service technician. Failure to comply could result in substantial property damage, severe personal injury, or death. Operate Pressure Relief Valve ● Before proceeding, verify that the relief valve outlet has been piped to a safe place of discharge, avoiding any possibility of scalding from hot water.
  • Page 80 Flushing the Water Heater Flushing the heat exchanger is a complicated procedure that should only be performed by a qualified service technician. NOTE: Improper maintenance WILL VOID water heater warranty. 1. Disconnect electrical power to the water heater. 2. Close the shutoff valves on both hot water outlet and cold water inlet lines (V1 and V2). See Figure 57. 3.

  • Page 81: Replacement Parts

    REPLACEMENT PARTS Figure 58 – Cabinet Replacement Parts Ref # Description Ref # Description Front Cover Hot Water Pipe Assembly 1-1. Control Panel Bracket Rocker Switch 1-2. Control Panel Window Condensate Trap Exhaust Assembly Control Panel Air Intake Assembly Circulation Pump Air Intake Filter Mixing Valve Cold Water Valve Assembly...

  • Page 82: Limited Warranty For 180,000 / 199,000Btu/Hr Tankless Water Heaters

    AP18733 REV. 3.2.17...
  • Page 83 AP18733 REV. 3.2.17...

  • Page 84: Maintenance Report

    WARNING Allowing the water heater to operate with a dirty combustion chamber will hurt operation. Failure to clean the heat exchanger as needed by the installation location could result in water heater failure, property damage, personal injury, or death. Such product failures ARE NOT covered under warranty.

  • Page 85: Maintenance Notes

    MAINTENANCE NOTES AP18733 REV. 3.2.17...

  • Page 86: Customer Installation Record Form

    CUSTOMER INSTALLATION RECORD FORM The following form should be completed by the installer for you to keep as a record of the installation in case of a warranty claim. After reading the important notes at the bottom of the page, please also sign this document. Customer’s Name: Installation Address: Date of Installation:...

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