Rheem RTGHRH11DVLN User Manual
CONDENSING
NKLESS
WATER HEATER
Use and Care Manual
180,000 I 199,000 Btu/Hr Models
LowNOx
Emissions
lnteek
A WARNING
2
SPECIAL ATTENTION BOXES
The following dened 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.
CAUTION
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.
IMPORTANT
IMPORTANT is used to indicate a potentially hazardous situation which, if not avoided, may result in property damage, FOR YOUR SAFETY is
used to indicate specic safety related instructions or procedures, and NOTICE is used to address practices not related to personal injury.
NOTE: Contains additional information important to a procedure.
AP18733 -3 (2/18)
WARNING
California Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer birth defects,
or other reproductive harm.
3
▪ FOREWORD
This manual is intended to be used in conjunction with other literature provided with the water heater. This includes all related control information.
It is important that this manual, all other documents included with this system, and additional publications including the National Fuel Gas Code,
ANSI Z223.1-2002, be reviewed in their entirety before beginning any work.
Installation should be made in accordance with the regulations of the Authority Having Jurisdiction, local code authorities, and utility companies
which pertain to this type of water heating equipment.
Authority Having Jurisdiction (AHJ) – The Authority Having Jurisdiction may be a federal, state, local government, or individual such as a
re chief, re marshal, chief of a re prevention bureau, labor department or health department, building ofcial or electrical inspector, or others
having statutory authority. In some circumstances, the property owner or his/her agent assumes the role, and at government installations, the
commanding ofcer or departmental ofcial may be the AHJ.
NOTE: Rheem reserves the right to modify product technical specications and components without prior notice.
▪ FOR THE INSTALLER
DANGER
This manual must only be used by a qualied heating installer/service technician. Read all instructions in this manual before installing. Perform
steps in the order given. Failure to comply could result in substantial property damage, severe personal injury, or death.
This appliance must be installed by qualied and licensed personnel. The installer should be guided by the instructions furnished with the water
heater, and with local codes and utility company requirements. In the absence of local codes, preference should be given to the National Fuel
Gas Code, ANSI Z223.1-2002.
INSTALLATIONS MUST COMPLY WITH:
Local, state, provincial, and national codes, laws, regulations and ordinances.
The latest version of the National Fuel Gas Code, ANSI Z223.1, from American Gas Association Laboratories, 8501 East Pleasant Valley Road,
Cleveland, OH 44131.
In Canada – CGA No. B149 (latest version), from Canadian Gas Association Laboratories, 55 Scarsdale Road, Don Mills, Ontario, Canada
M3B 2R3. Also, Canadian Electrical Code C 22.1, from Canadian Standards Association, 5060 Spectrum Way, Suite 100, Mississauga, Ontario,
Canada L4W 5N6.
Code for the installation of Heat Producing Appliances (latest version), from American Insurance Association, 85 John Street, New York, NY
11038.
The latest version of the National Electrical Code, NFPA No. 70.
NOTE: The gas manifold and controls met safe lighting and other performance criteria when the water heater underwent tests specied in ANSI
Z21.10.3 – latest edition.
AP18733 -3 (2/18)
4
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. ANNUAL MAINTENANCE.........................................................................................................................................13
D. TROUBLESHOOTING...................................................................................................................................................13
THE FOLLOWING ARE INSTALLATION INSTRUCTIONS FOR THE CONTRACTOR.......................................................14
ITEMS SHIPPED WITH THE WATER HEATER....................................................................................................................15
SAFETY REGULATIONS.......................................................................................................................................................15
A. OPERATION AND INSTALLATION WARNINGS..........................................................................................................15
B. IMPROPER COMBUSTION...........................................................................................................................................16
C. GAS...............................................................................................................................................................................16
D. WHEN SERVICING THE WATER HEATER..................................................................................................................17
E. WATER CHEMISTRY REQUIREMENTS.......................................................................................................................17
F. FREEZE PROTECTION.................................................................................................................................................17
G. SCALDING....................................................................................................................................................................18
H. HIGH ELEVATION INSTALLATIONS............................................................................................................................18
SPECIFICATIONS..................................................................................................................................................................19
A. SPECIFICATIONS.........................................................................................................................................................19
B. COMPONENTS.............................................................................................................................................................20
C. DIMENSIONS................................................................................................................................................................21
PREPARE WATER HEATER LOCATION..............................................................................................................................22
A. BEFORE LOCATING THE WATER HEATER...............................................................................................................22
B. LEVELING.....................................................................................................................................................................23
C. CLEARANCES FOR SERVICE ACCESS.....................................................................................................................23
D. RESIDENTIAL GARAGE AND CLOSET INSTALLATIONS.........................................................................................23
E. EXHAUST VENT AND INTAKE PIPE............................................................................................................................... 24
F. CARBON MONOXIDE DETECTORS............................................................................................................................ 24
G. PREVENT COMBUSTION AIR CONTAMINATION......................................................................................................24
AP18733 -3 (2/18)
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. TIGHTENING WATER HEATER COLLAR TO EXHAUST VENT AND INTAKE PIPE.................................................32
E. VENT TERMINATION....................................................................................................................................................32
1. Direct Vent, Two Pipe Roof and Sidewall Vent Terminations...............................................................................33
2. Direct Vent, Optional Horizontal and Vertical Vent Kits........................................................................................33
3. Screen Installation....................................................................................................................................................33
4. Power Venting, Indoor Combustion Air Installation in Conned or Unconned Space....................................34
F. COMMON VENT PIPING...............................................................................................................................................36
1. VENT DIAMETER SIZING AND LENGTHS..............................................................................................................36
2. RECOMMENDED EXHAUST PIPE TRANSITIONS.................................................................................................37
3. TWO PIPE VENT SYSTEM (DIRECT VENT)............................................................................................................38
INSTALL THE CONDENSATE DRAIN..................................................................................................................................38
GAS PIPING..........................................................................................................................................................................40
A. GAS PIPE SIZING TABLES..............................................................................................................................................40
1. Gas Pipe Sizing.................................................................................................................................................................40
2. Natural Gas Pipe Sizing...................................................................................................................................................40
3. LP (Liquid Propane) Gas Pipe Sizing..............................................................................................................................41
B. GAS CONNECTION REQUIREMENTS............................................................................................................................42
C. ADDITIONAL PRECAUTION FOR EXCESS FLOW VALVE (EFV)..................................................................................43
D. ADJUSTING GAS PRESSURE AT THE WATER HEATER..............................................................................................43
E. SETTING AND VERIFYING THE COMBUSTION SETTING............................................................................................43
WATER PIPING ......................................................................................................................................................................44
A. GENERAL PLUMBING CONNECTION GUIDELINES.....................................................................................................44
B. INSTALL A BACKFLOW PREVENTER........................................................................................................................... 46
C. PIPING THE WATER HEATER.........................................................................................................................................46
D. APPLICATIONS.................................................................................................................................................................46
E. PRESSURE RELIEF VALVE.............................................................................................................................................49
CONNECT ELECTRICAL POWER / INITIAL STARTUP.......................................................................................................50
A. WIRING INFORMATION................................................................................................................................................... 50
B. DIP SWITCHES.................................................................................................................................................................51
AP18733 -3 (2/18)
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. Set the Recirculation Timer Type............................................................................................................................64
2. Setting the Recirculation Run Time (Pro9 Recirculation Timer)..........................................................................65
3. Resetting the Recirculation Run Time....................................................................................................................66
J. ERROR MODE...................................................................................................................................................................67
K. ERROR TREE ANALYSIS.................................................................................................................................................67
1. FLAME DETECTION..................................................................................................................................................71
2. GAS DETECTION......................................................................................................................................................72
3. AIR PRESSURE SWITCH..........................................................................................................................................72
4. Inlet / DHW / Operating Temperature Sensors.......................................................................................................73
FINAL INSTALLATION CHECKLIST.....................................................................................................................................74
TROUBLESHOOTING...........................................................................................................................................................76
DIAGNOSTICS AND SUGGESTED CORRECTIVE ACTIONS ............................................................................................76
MAINTENANCE PROCEDURES...........................................................................................................................................77
REPLACEMENT PARTS.......................................................................................................................................................81
Limited Warranty for 180,000 / 199,000Btu/hr Tankless Water Heaters...........................................................................82
MAINTENANCE REPORT......................................................................................................................................................84
MAINTENANCE NOTES........................................................................................................................................................85
CUSTOMER INSTALLATION RECORD FORM....................................................................................................................86
AP18733 -3 (2/18)
USER'S INFORMATION
▪ A. PRODUCT AND SAFETY INFORMATION
WARNING
USER – Have this water heater serviced/inspected by a qualied 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. STOP! DO NOT use this water heater unless it is completely lled with water.
2. Ensure electrical power to the water heater is turned OFF.
3. This water heater is equipped with an ignition device which automatically lights the burner. DO NOT attempt to light the burner by hand.
4. Turn the gas shut-off valve clockwise to the “OFF” position. Do not force.
5. Wait ve (5) minutes to clear out any gas. If you smell gas, STOP! Follow the information on page 2, this manual. If you don’t smell gas,
go to the next step.
6. Turn manual gas shut-off valve to the “ON” position.
7. Turn ON electrical power to the water heater.
8. Wait until default temperature (120°F/ 49°C) is displayed. Set desired water temperature.
9. If the water heater will not operate, follow the instructions on page 2 to turn off the gas to the water heater. Then call your service
technician or gas supplier.
7
TO TURN OFF GAS TO THE WATER HEATER
1. Set the thermostat to the lowest setting.
2. Turn off all electrical power to the water heater.
3. Turn manual gas shutoff valve to “OFF”.
WARNING
Proper care of this water heater is the user’s / owner’s responsibility. The user / owner should carefully read and understand the Operating
Information in this manual before operating this water heater.
It is the user / owner’s responsibility to know the location of the gas shut-off valve and how to operate it. Immediately close the gas shut-off valve
if the water heater is subjected to re, overheating, ood, physical damage, or any other damaging condition that might affect the operation of the
unit. Have the water heater checked by a qualied technician before resuming operation.
DO NOT use this water heater if ANY part has been under water. Immediately call a qualied technician to inspect the water heater and replace
any part of the control system or gas control which has been under water.
DO NOT power up the water heater unless the gas and water supply valves are fully opened. Make sure the fresh air intake pipe and exhaust
vents are open and functional.
DO NOT attempt to install, repair, or service this water heater. Contact a qualied technician if the water heater needs repair or maintenance. Ask
your gas supplier for a list of qualied service providers.
DO NOT use spray paint, hair spray, or any other ammable sprays near the water heater or near the exterior fresh air intake pipe termination. DO
NOT place any items in or around the exterior exhaust vent termination and/or fresh air intake pipe that could restrict or block the ow in or out of
the vent system.
All safety devices must be tested after the water heater is installed.
Always verify proper water heater operation after servicing.
The gas ignition system components must be protected from water (dripping, spraying, rain, etc.) during water heater operation and service
(circulator replacement, condensate trap, control replacement, etc.)
The E80 code will display when there is no water in the water heater. Ensure the water heater is full of water. Then manually reset the water
heater to resume operation.
This water heater features a factory installed overheating prevention device. This limit provides water heater shutdown in the event that the water
heater water temperature exceeds the set point of the limit control. Certain local codes require additional water temperature limiting devices.
Failure to follow these warnings could result in property damage, personal injury, or death.
AP18733 -3 (2/18)
8
▪ 1. BEFORE OPERATION
1. Check the Gas Type (NG/LP)
When operating the water heater for the rst 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. Check the Power (120V 60Hz)
Ensure the water heater is connected to a properly rated power supply.
3. Check the Cold Water Inlet Valve
Ensure the cold water inlet valve is open when operating the water heater. The water heater will not operate if there is insufcient water
supply.
4. Check the Gas Valve
Ensure the manual shut-off gas valve is open. The water heater will not operate unless it is supplied with gas.
5. Check the Area around the Water heater
Remove any combustible or ammable materials from the area around the water heater and do not hang wet laundry from the exhaust vent
pipe.
WARNING
Attempting to operate this water heater on a gas supply other than specied on the rating plate will result in improper water heater operation, and
could result in property damage, personal injury, or death.
DANGER
Do not operate the water heater if its combustion air intake is located in or near one of the areas or in the vicinity of products listed in Table 1.
These areas will always contain hazardous contaminates that can form strong acids while passing through the burner and vent system. These
acids will corrode the water heater’s heat exchanger, burner components and vent system, resulting in ue gas spillage and/or water leakage,
possible substantial property damage, severe personal injury, or death. If the water heater combustion air intake is located in any area likely to
cause or contain contamination, or if products which would contaminate the air cannot be removed, the intake must be re-piped and terminated
to another location.
DO NOT re-pipe ventilation system on your own. Call a qualied service provider for assistance.
PRODUCTS TO AVOID AREAS LIKELY TO HAVE CONTAMINANTS
Spray cans containing uorocarbons 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 Auto body shops
Paint or varnish removers Plastic manufacturing plants
Hydrochloric or Muriatic acid Furniture renishing areas and establishments
Cements and glues New building construction
Antistatic fabric softeners used in clothes dryers Remodeling areas
Chlorine-type bleaches, laundry detergents, and cleaning solvents Garages and workshops
Adhesives used to fasten building products
Table 1
▪ 2. DURING OPERTAION
1. Check for Gas Leaks
Frequently check the gas pipe and connections for leaks with a soapy solution. If
air bubbles appear during the test, gas is leaking out. Close the gas supply valve
and call your gas supplier for inspection.
WARNING
After any repair of the gas pipeline or replacement of the gas regulator, call a qualied
service technician to observe the installation and replacement before restoring power
to the water heater. Failure to do so could result in a re or explosion, substantial
property damage, severe personal injury, or death.
2. Check for Proper Ventilation
Ensure there is sufcient ventilation while operating the water heater. Improper
ventilation could result in premature water heater failure. Such failures ARE NOT
covered by water heater warranty.
AP18733 -3 (2/18)
9
WARNING
Exhaust gas entering the living space can cause carbon monoxide poisoning. If exhaust gas should leak into the living space:
• Shut down the water heater.
• Close the gas valve.
• Open windows for ventilation.
Immediately call a qualied service technician to inspect the water heater and exhaust vent pipe. Any damages to the exhaust vent pipe should
be repaired immediately. Failure to do so could result in substantial property damage, severe personal injury, or death.
3. Burn Warning
Take caution when inspecting the water heater, exhaust vent, and/or water pipes. These components can get extremely hot during water
heater operation.
4. Combustibles and Flammable Material Warning
Do not store combustibles or flammable materials in the vicinity of this water heater. Do not hang clothes from the exhaust pipe.
WARNING
Storing ammable or combustible materials near this water heater could result in a re or explosion, substantial property damage, severe
personal injury, or death.
5. Check for Water Leaks
• Do not attempt to clean the heating system. Call a qualified service technician for service.
• If you notice any leaks, immediately call a qualified service technician. Leaks in water heater or piping must be repaired at once.
▪ 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.
WARNING
DO NOT wipe the water heater or control panel with a wet cloth. Doing so may result in an electric shock, substantial property damage, premature
water heater failure, severe personal injury, or death.
DO NOT shut off the water heater for long periods of time during potentially freezing conditions. This water heater has a freeze protection function.
The ceramic heater installed inside of the heater’s heat exchanger is designed to protect the water heater from freezing.
Ensure the exposed water pipes are thermally insulated to prevent damage due to freezing conditions. If the water heater is not to be used for an
extended period of time during freezing conditions, shut down the system and completely drain the water heater.
If the water heater is not to be used for an extended period of time during freezing conditions, consider shutting down the system and draining it
of water. Shut off the gas and cold water supply valves.
WARNING
DO NOT attempt to disassemble this water heater. Doing so could result in improper water heater operation or premature water heater failure,
substantial property damage, and/or severe personal injury or death due to electric shock, re, or explosion. If repairs are required, contact a
qualied service technician.
CAUTION
DO NOT touch the exhaust vent or hot water pipes during water heater operation. Doing so could result in substantial personal injury.
DANGER
Be careful when opening a hot water faucet or draining water from the water heater. Water temperature over 125°F can instantly cause severe
burns, or death, from scalds. Children, disabled, and elderly are at the highest risk of being scalded. See instruction manual before setting
temperature at water heater. Feel water before bathing or showering!
AP18733 -3 (2/18)
▪ 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.
• If applicable, check the condensate neutralizer and ensure it is full of condensate neutralizing marble chips.
• Check for leaks: Water, gas, flue and condensate.
• Verify exhaust vent and intake piping are in good condition and sealed tight.
• Check exhaust vent and intake pipe bracing. Ensure bracing is undamaged and in good condition.
• Check water heater water pressure, piping and expansion tank.
• Check control settings.
• Check ignition electrode. Sand off any white oxide. Clean and reposition.
• Check ignition and ground wiring.
• Check all control wiring and connections.
• Check burner flame pattern (stable and uniform).
Additional Items if Combustion or Performance is Poor
• Clean heat exchanger and flue ways.
• Remove burner assembly and clean burner head using compressed air only.
Once the maintenance items are completed, the service technician should review service with the owner.
2. OWNER MAINTENANCE
Periodically
• Check area around the water heater.
• Check and remove any blockage from the outdoor exhaust vent and intake pipe terminations. DO NOT perform this maintenance
if exhaust vent and intake pipe terminations are in difficult to reach locations.
• Check the temperature/pressure gauge.
Monthly
• Check exhaust vent and intake piping.
• Check exhaust vent and intake pipe bracing. Ensure bracing is undamaged and in good condition.
• Check the pressure relief valve.
• Check the condensate drain system.
• If applicable, check the condensate neutralizer and ensure it is full of condensate neutralizing marble chips.
Every 6 Months
Check water heater piping and gas supply piping for corrosion or signs of potential leakage.
10
▪ C. MAINTENANCE PROCEDURES
DANGER
The water heater must be inspected and serviced annually, preferably at the start of the heating season, by a qualied service technician. In
addition, the maintenance and care of the water heater as outlined in this manual must be performed by the user/owner to assure maximum
efciency and reliability. Follow the maintenance procedures given throughout this manual. Failure to perform the service and maintenance or
follow the directions in this manual could damage the water heater or system components, resulting in substantial property damage, severe
personal injury, or death.
1. DAILY MAINTENANCE
Check the Surrounding Area
DANGER
The water heater must be inspected and serviced annually, preferably at the start of the heating season, by a qualied service technician. In
addition, the maintenance and care of the water heater as outlined in this manual must be performed by the user/owner to assure maximum
efciency and reliability. Follow the maintenance procedures given throughout this manual. Failure to perform the service and maintenance or
follow the directions in this manual could damage the water heater or system components, resulting in substantial property damage, severe
personal injury, or death.
Combustible/Flammable Materials
Do not store combustible materials, gasoline, or other flammable vapors or liquids near the water heater. If found, remove these materials
immediately
Air Contaminates
If allowed to contaminate combustion air, products containing chlorine or fluorine will produce acidic condensate that will cause significant
damage to the water heater. Read the list of potential contaminates and areas likely to have these contaminates in Table 1, Part 2. If
any of these contaminates are in the room where the water heater is located, or combustion air is taken from one of the areas listed, the
contaminates must be removed immediately or the intake pipe must be relocated to another area.
.
AP18733 -3 (2/18)
11
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. Clear any debris from the panel.
Check Exhaust Vent and Intake Pipe Terminations
Verify that the water heater exhaust vent and intake pipe terminations are clean and free of obstructions. Remove any debris from the
exhaust vent or intake pipe openings. If removing the debris does not allow the water heater to operate correctly, contact your qualified
service technician to inspect the water heater and the vent system.
2. MONTHLY MAINTENANCE
Check Exhaust Vent and Intake Piping
Visually inspect the exhaust vent for any signs of blockage, leakage, or deterioration of the piping. Inspect the exhaust vent bracing. Ensure
bracing is undamaged and in good condition. Notify a qualified service technician immediately if any problems are found.
WARNING
DO NOT attempt to disassemble this water heater. Doing so could result in improper water heater operation or premature water heater failure,
substantial property damage, and/or severe personal injury or death due to electric shock, re, or explosion. If repairs are required, contact a
qualied service technician.
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. Inspect the intake pipe bracing. Ensure bracing is undamaged and in good condition. Notify a qualified service
technician if any problems are found.
Check Pressure Relief Valve
• Visually inspect the primary pressure relief valve and discharge pipe for signs of weeping or leakage.
• If the pressure relief valve often weeps, the expansion tank may not be operating properly. Immediately contact a qualified service
technician to inspect the water heater and system.
Check the Condensate Drain System
• While the water heater is running, check the discharge end of the condensate drain tubing. Ensure no flue gas is leaking from the
condensate drain tubing by holding your fingers near the opening.
• If you notice flue gas leaking from the opening, this indicates a dry condensate drain trap. If problem persists, contact a qualified service
technician to inspect the water heater and condensate line and refill the condensate trap.
• If applicable, check the condensate neutralizer and ensure it is full of condensate neutralizing marble chips.
Cleaning the Air Intake Filter
The air intake filter should be cleaned once a month. If not, the water heater could encounter combustion problems.
To clean the air intake filter:
1. Press the Power button on the control panel to turn off the water heater.
2. Disconnect the power supply from the water heater.
3. If water heater has been operating, wait for it to cool before continuing.
4. Remove the front cover of the water heater cabinet.
5. Pull the filter screen screw and pull the filter out of the air intake adapter.
6. Remove the filter from the plastic assembly and clean it with a toothbrush and clean running water. See Figure 1.
7. Dry the filter completely. Then reinsert the filter into the plastic assembly.
8. Replace the front cover of the water heater cabinet. Reconnect power supply to the water heater.
9. Press the Power button on the control panel to turn on the water heater.
Figure 1 – Cleaning the Air Intake Filter
AP18733 -3 (2/18)
12
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.
• Visually inspect for leaks around the internal water heater water connections and around the heat exchanger. Visually inspect the
external system piping, circulators, and system components and fittings. Immediately call a qualified service technician to repair any leaks
WARNING
Have leaks xed at once by a qualied 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.
• Shut power off to the water heater. To avoid scalding, wait for water heater to cool before operating the relief valve.
WARNING
To avoid water damage or scalding due to relief valve operation, a discharge line must be connected to the valve outlet and directed to a safe
place of disposal. This discharge line must be installed by a qualied service technician or heating/plumbing installer in accordance with the water
heater installation manual. The discharge line must be terminated so as to eliminate possibility of severe burns or property damage should the
valve discharge.
• Lift the relief valve lever. If water flows freely, release the lever and allow the valve to seat. Watch the end of the relief valve discharge
pipe to ensure that the valve does not weep after the line has had time to drain. If the valve weeps, lift the lever again to attempt to clean the
valve seat. If the valve does not properly seat and continues to weep, contact a qualified service technician to inspect the valve and system.
• If water does not flow from the valve when you completely lift the lever, the valve or discharge line may be blocked. Immediately shut the
water heater down per instructions on page 2 and call a qualified service technician to inspect the valve and system.
• If relief valve seats properly, restore power to the water heater. Observe operation for five minutes and ensure it operates properly.
4. ANNUAL MAINTENANCE
Check the Burner
The burner should be checked and cleaned only by a qualied service technician.
Cleaning the Cold Water Inlet Filter (Draining the Water Heater)
The Cold Water Inlet Filter should only be cleaned by a qualied service technician.
Flushing the Water Heater
Flushing the Water Heater heat exchanger is a complicated procedure that should only be performed by a qualied service technician.
NOTE: Improper maintenance WILL VOID water heater warranty.
AP18733 -3 (2/18)
▪ 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
Burner Does Not Ignite
Water is Not Hot Enough
Water is Too Hot
Hot Water Temperature Fluctuates at Tap
The Blower Continues to Operate After
Combustion Stops
Cannot Change the DHW Mode Setpoint
above 120°F (49°C)
The Water Heater Makes Abnormal Sounds
During Operation
Table 2 – Troubleshooting Chart
Make sure that the water heater is supplied with water. The unit activates when inlet water ow
sensor detects ow over 0.5 gpm / 1.9 lpm.
Make sure the cold and hot water lines are not plumbed in reverse
Ensure the cold water and gas supply lines are open
Make sure the water lines are not frozen.
Ensure the temperature setting on the water heater is not too low
Ensure the lter in the cold water supply line is not clogged with debris
Make sure the water heater is connected to the correct gas supply
Check that supply and manifold gas pressures are in accordance with specications
Ensure the water flow sensor with three wires is properly connected on the top of the heat
exchanger
Ensure the temperature setting is not too hot
Ensure the lter in the cold water supply line is not clogged with debris
Make sure the water heater is connected to the correct gas supply
Ensure the lter in the cold water supply line is not clogged with debris
Make sure the water heater is connected to the correct gas supply
Ensure the supply gas pressure is sufcient
This is normal. The blower operates for one minute after combustion has stopped to vent the
remaining exhaust gas from the ue.
This is a safety device to prevent scalding. Hot water temperature over 125°F (51°C) can cause
instant severe burns or death. To change water temperature above 120°F (49°C), see CHANGING
THE DHW SET-POINT section, this manual.
Ensure the venting installation complies with the installation manual.
Ensure supply gas pressure is sufficient. Insufficient gas pressure will cause unstable burner
ame and noise.
13
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 qualied service technician or the gas supplier to check the water heater. Failure to follow these instructions could result
in property damage, personal injury, or death.
AP18733 -3 (2/18)
14
THE FOLLOWING ARE INSTALLATION
INSTRUCTIONS FOR THE CONTRACTOR
ITEM DESCRIPTION QUANTITY
AP18733 REV. 3.2.17
1
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
This water heater is not suitable for use in manufactured (mobile) homes.
Printed in the USA.
15
Tankless Water Heater
CONDENSING
TANKLESS
WATER H EATE R
Use and Care Manual
User’s Information
Installation
Start-Up
Maintenance
Parts
Use and Care Manual
180,000 / 199,000 Btu/Hr Models
WARNING
, a re or explosion may result, causing property damage, personal injury, or death.
FOR YOUR SAFETY!
Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other appliance. To do so may result in
•
an explosion or re.
Installation and service must be performed by a qualied installer, service agency, or the gas supplier.
•
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
•
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the re department.
• Do not return to your home until authorized by the gas supplier or re department.
1 Each
www.rhem.com
Anchors and Wall Mounting Bracket 4
Vent Screens (3" [7.6 cm]) 2 Screens
Isolation Valve
* On some models only
Pressure Relief Valve
for DHW (ASME Certied)
(3/4
”,150 psi)
* On some models only
1
1
1
Emergency Kit
1
Table 3 – Items Included with the Water Heater
SAFETY REGULATIONS
▪ A. OPERATION AND INSTALLATION WARNINGS
To avoid serious injury or death, read, understand, and follow all the precautions listed here.
DANGER
Vapors from ammable liquids will explode and can cause a re, resulting in personal injury or death. The water heater has a burner that can
come on at any time and ignite vapors. DO NOT use or store ammable liquids around the water heater.
Improper venting can cause a build-up of carbon monoxide. Breathing carbon monoxide can result in brain damage or death. DO NOT operate the
water heater unless it is properly vented to the outside and has an adequate fresh air supply for safe operation. Inspect the exterior exhaust gas
outlet port and fresh air inlet port on a regular basis to ensure they are functioning properly.
A concentration of carbon monoxide as small as .04% (400 parts per million) in the air can be fatal. When making high re or low re adjustments,
CO levels must be monitored using a ue gas analyzer such that a CO level of no more than 150 ppm is exceeded at any time during operation.
Adjusting the “low re offset” or the “main ow restrictor” in small increments can result in a signicant increase in CO concentration. To avoid
serious injury or death, DO NOT make any adjustments to the gas valve without monitoring the exhaust gases with a fully functional and calibrated
ue gas analyzer.
WARNING
This water heater must be installed by a licensed plumber, licensed gas tter, and/or professional service technician. Improper installation and/or
operation can cause a potentially hazardous situation, which, if not avoided, could result in serious injury or death, and will void the warranty.
Rheem cannot anticipate every circumstance that might involve a potential hazard. Each installation has its own specialized characteristics,
requirements, and possible hazards. Therefore, all possible incidents are not included in these warnings. Proper and safe installation, operation,
and service are the responsibility of the professional service technician.
Proper care of the water heater is the user’s responsibility. Ensure the user carefully reads and understands the User’s Information Manual before
operating and maintaining the water heater.
Make sure the user knows the location of the gas shut-off valve and how to operate it. Immediately close the gas shut-off valve if the water heater
is subjected to re, overheating, ood, physical damage, or any other damaging condition that might affect the operation of the unit. Have the
water heater checked by a qualied technician before resuming operation.
AP18733 -3 (2/18)
16
Do not power up the unit unless the gas and water supply valves are fully opened. Make sure the fresh air intake port and exhaust gas port are
open and functional.
No one but a professional service technician should attempt to install, service, or repair this water heater. There are no serviceable parts which
can be changed by the user / owner. User / Owner: Contact the original professional service technician if the water heater needs repair or
maintenance. If the original technician is unavailable, ask your gas supplier for a list of qualied service providers.
WARNING
Keep the area around the water heater clean and free of all materials that can burn. DO NOT store or place gasoline, oils, spray paint, or other
ammable products near the water heater.
DO NOT use spray paint, hair spray, or any other ammable spray near the water heater or near the exterior fresh air intake port. DO NOT place
any items in or around the exterior exhaust gas outlet port and/or fresh air inlet port that could restrict or block the ow in or out of the vent system.
DO NOT store or place newspapers, laundry, or other combustible items near the water heater or the exterior exhaust gas outlet and/or fresh air
inlet port.
The owner should inspect the system monthly for damage, water stains, signs of rust, corrosion, and exhaust vent and air intake blockage. If
inspection of the unit shows signs of damage, the water heater should be shut off until the problem is repaired by a qualied technician.
After installation, all water heater safety devices should be tested.
This water heater is certied for indoor installations only. The water heater consists of gas ignition system components which must be protected
from water (dripping, spraying, etc.) during operation and service. Carefully consider installation location and the placement of critical components
(circulators, condensate neutralizers, etc.) before installing the water heater.
DO NOT allow children to operate this unit. DO NOT use this unit if it does not appear to be operating correctly. A qualied technician should
service and inspect the water heater annually.
The water heater temperature is factory set to 120°F (49°C). To avoid scalding, always check the temperature of the hot water before bathing,
showering, washing, etc. DO NOT adjust the water temperature while the water heater is being used by other persons.
NOTICE
If the water heater is exposed to the following, do not operate until all corrective steps have been made by a qualied service technician:
1. FIRE
2. DAMAGE
3. WATER
DO NOT alter or modify the water heater or water heater controls. This can be dangerous and WILL VOID the warranty.
This water heater is equipped with a three prong plug. It should only be plugged directly into a properly grounded three prong receptacle. DO NOT
remove the ground plug from the plug.
Any claims for damage or shortage in shipment must be led immediately against the transportation company by the consignee.
This water heater provides a overheat shutdown limit. In the event the water heater water exceeds the set point of the control limit, the cutoff
will trip and the water heater will shut down. 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.
NOTE: When inquiring about service or troubleshooting, reference the model and serial numbers from the water heater rating label.
WARNING
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN SUBMERGED IN WATER. Immediately call a qualified service technician. The
appliance MUST BE replaced if it has been submerged. Attempting to operate an appliance that has been submerged could create numerous
harmful conditions, such as a potential gas leakage causing a re and/or explosion, or the release of mold, bacteria, or other harmful particulates
into the air. Operating a previously submerged appliance could result in property damage, severe personal injury, or death.
NOTE: Appliance damage due to ood or submersion is considered an Act of God, and IS NOT covered under product warranty.
Be sure to disconnect electrical power before opening water heater cabinet or performing service. Label all wires while performing service to
ensure proper re-wiring of the water heater. Wiring errors can cause improper or dangerous operation. Failure to do so could result in an electrical
shock, improper water heater operation, property damage, serious personal injury, or death.
▪ B. IMPROPER COMBUSTION
WARNING
Do not obstruct the ow of combustion and ventilating air. Adequate air must be provided for safe operation. Failure to keep the exhaust vent and
intake pipe clear of ice, snow, or other debris could result in property damage, serious personal injury, or death.
▪ C. GAS
Should overheating or gas supply fail to shut off, do not turn off or disconnect electrical supply to the circulator. Instead, shut off the gas supply
at a location external to the appliance
AP18733 -3 (2/18)
17
▪ D. WHEN SERVICING THE WATER HEATER
• To avoid electric shock, disconnect electrical supply before performing maintenance.
• To avoid severe burns, allow water heater to cool.
• Do not use petroleum-based cleaning or sealing compounds in a water heater system. Gaskets and seals in the system may be damaged,
possibly resulting in substantial property damage.
• Do not use “homemade cures” or “patent medicines”. Substantial property damage, damage to water heater, and/or serious personal injury may result.
• Always verify proper operation after servicing the water heater.
▪ E. WATER CHEMISTRY REQUIREMENTS
IMPORTANT
Chemical imbalance of the water supply may affect efciency and cause severe damage to the appliance and associated equipment. Water quality
must be professionally analyzed to determine whether it is necessary to treat the water. Various solutions are available to adjust water quality.
Adverse water quality will affect the reliability of the system. In addition, operating temperatures above 135°F will accelerate the build-up of lime
scale and possibly shorten appliance service life. Failure of an appliance due to lime scale build-up, low pH, or other chemical imbalance IS NOT
covered by the warranty.
The water must be potable, free of corrosive chemicals, sand, dirt, and other contaminates. It is up to the installer to ensure the water does not
contain corrosive chemicals or elements that can damage the heat exchanger. Potable water is dened as drinkable water supplied from utility or
well water in compliance with EPA secondary maximum contaminant levels (40 CFR Part 143.3) as shown in the table below. If the water contains
contaminants higher than outlined by the EPA, water treatment is recommended and additional, more frequent maintenance may be required.
If you suspect that your water is contaminated in any way, discontinue use of the appliance and contact an authorized technician or licensed
professional.
Contaminant Maximum Allowable Level Contaminant Maximum Allowable Level
Total Hardness
(Residential Use - Below 140°F
water temperature)
200 mg/l
(12 grains/gallon) pH 6.5-8.5
Total Hardness
(Commercial Use - 140°F and
above water temperature)
Aluminum 0.05 to 0.2 mg/l Total Dissolved Solids (TDS) 500 mg/l
Chloride 100 mg/l Zinc 5 mg/l
Manganese 0.05 mg/l Dissolved Carbon Dioxide (CO
Table 4 – Water Quality Specications
120 mg/l Sulfate 205 mg/l
2
) 15 mg/l or PPM
▪ F. FREEZE PROTECTION
IMPORTANT
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.
NOTE: Freeze protection will not be active if the water heater loses power.
Freeze Protection Operation
System Freeze Protection
(Activates Based on Internal Water
Temperature)
Table 5 – Freeze Protection Detail
Stage 1 – If control detects water temperature of 46°F (8°C) and below, the internal pump cycles until the
control detects return water temperature of 50°F (10°C) and above.
Stage 2 – If control detects water temperature of 41°F (5°C) and below, the burner and internal pump will
run continuously until the control detects return water temperature of 104°F (40°C) and above.
.
AP18733 -3 (2/18)
▪ 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 to 2 minutes
130°F About 30 seconds
135°F About 10 seconds
140°F Less than 5 seconds
145°F Less than 3 seconds
150°F About 1 ½ seconds
155°F About 1 second
Table 6 – Time and Temperature Relationship in Scalds
This heater can deliver scalding water. Be careful whenever using hot water to avoid scalding
injury. Certain appliances, such as dishwashers and automatic clothes washers may require
increased water temperature. By setting the thermostat on this heater to obtain the increased water
temperature required by these appliances, you may create the potential for scald injury.
18
To protect against injury, you should install a mixing valve in the water system. This valve will reduce
point of discharge temperature by mixing cold and hot water in branch supply lines. Such valves are
available from your local plumbing supplier.
Table 6 details the relationship of water temperature and time with regard to scald injury and may be
used as a guide in determining the safest water temperature for your applications.
▪ H. HIGH ELEVATION INSTALLATIONS
DANGER
Natural gas at high elevation might contain less heating value than typical 1,000 BTU/cu ft and therefore can cause improper air / gas mix leading
to improper combustion. For natural gas installations above 3,000 ft, call your gas provider to determine the heating value of the supplied natural
gas.water
To set the water heater to operate at the installation elevation, see INSTALLER MODE, this manual.
AP18733 -3 (2/18)
SPECIFICATIONS
▪ A. SPECIFICATIONS
19
Model Name
Gas Input Rate
Hot Water Capacity
Flue System Sealed Combustion Direct Vent, Single Vent
Max Vent Run 2″(50ft) / 3″(100ft) Schedule 40 PVC, CPVC, PP
Orice Size
Gas Supply Pressure
Manifold Pressure
Power Supply
Ignition System Direct Electronic Ignition / Automatic Flame Sensing
Burner System Premixed Metal Fiber Burner
Gas Valve System Air ratio valve
Minimum Flow Activation Flow 0.5 GPM
Internal Pipe Material STS 304, Copper Tubing
Dimensions W17.3″ – H28.7″ – D14.8″
Water Holding Capacity Under 2 Gallon
Control Panel / Main Controller P-950C / NGTH-9700C
Water Pressure
Materials
Safety Devices
RTGH-RH11DV RTGH-RH10DV
MAX 199,000 Btu/h 180,000 Btu/h
MIN 18,000 Btu/h 18,000 Btu/h
High Altitude
(2,500~4,500ft)
35°F Rise 11.0 Gal 9.9 Gal
45°F Rise 8.5 Gal 7.7 Gal
77°F Rise 5.0 Gal 4.5 Gal
Installation Indoor Wall Hung
NG (Gas / Needle) 0.342″(8.7mm) / 0.354″(9.0mm)
LP (Gas / Needle) 0.263″(6.7mm) / 0.267″(6.8mm)
NG 5.0″ W.C to 10.5″ W.C
LP 9.5″ W.C to 13.0″ W.C
Gas Type NG LP NG LP
Low Fire
High Fire
Main Supply 120V 60Hz
Maximum
Power Consumption
Weight 85 lbs
Heat Exchanger Heat Exchanger : STS 304
2″ VENT
3″ VENT
2″ VENT
3″ VENT
MAX Hot water 150 psi
MIN 15 psi
Casing Cold Rolled Carbon Steel
180,000 Btu/h 180,000 Btu/h
-0.07" W.C -0.02" W.C -0.07" W.C -0.02" W.C
-0.07" W.C -0.02" W.C -0.07" W.C -0.02" W.C
-0.38" W.C -0.3" W.C -0.36" W.C -0.28" W.C
-0.33" W.C -0.25" W.C -0.31" W.C -0.23" W.C
172W(82W+90W_PUMP)
Flame Sensor, Overheat Cut Off Limit Switch ,
Gas Leak Detector sensor, Water Leak Detector Sensor
Exhaust Temperature Sensor,
Water Temperature Sensor
AP18733 -3 (2/18)
▪ B. COMPONENTS
20
1
28
27
26
2
25
3
24
4
5
6
23
22
7
8
9
21
10
NO Name of Component
Exhaust Outlet Collar
1
Ignition Trans
2
Ignition Rod
3
Over-heating Switch
4
Primary Heat Exchanger
5
H/E Temperature Sensor
6
Secondary Heat Exchanger
7
Control Panel
8
11
12
17
14
15
16
13
NO Name of Component
Main Controller
15
‘DHW’ Inlet Filter
16
‘DHW’ Inlet Adapter
17
Gas Inlet Adapter
18
Manual Power Switch
19
Water Flow Control Valve
20
Air Pressure Switch
21
Flame Detection Sensor
22
20
19
18
Mixing Valve
9
Recirculation Pump
10
'DHW' supply Adapter
11
Condensate Trap
12
Low level sensor
13
Recirculation Return Adapter
14
Gas Valve
23
Burner Case
24
AGM(Air Gas Mixer)
25
BLDC Fan
26
Air Intake Filter
27
Air Intake Collar
28
AP18733 -3 (2/18)
▪ C. DIMENSIONS
21
11.5" [292mm]
4.0" [101mm]
17.3" [439 mm]
4.6" [117mm]
14.8" [376 mm]
2.4" [60mm]
6.1" [156mm]
5.4" [136mm]
2.6" [67mm]
3.2" [81mm]
6.8" [173mm]
10.2" [260mm]
13.6" [346mm]
28.7" [728mm]
DESCRIPTION DIAMETER
A Exhaust Outlet Pipe 3" (7.6 cm)
B Air Intake 3" (7.6 cm)
C DHW Outlet Adapter ¾" (1.9 cm)
D Condensate Adapter ½" (1.2 cm)
E Recirculation Return ¾" (1.9 cm)
F DHW Inlet Adapter ¾" (1.9 cm)
G Gas Inlet ¾" (1.9 cm)
Figure 3 – Water Heater Drainage Locations
AP18733 -3 (2/18)
PREPARE WATER HEATER LOCATION
IMPORTANT
Carefully consider installation when determining water heater location. Please read the entire manual before attempting installation. Failure to
properly take factors such as water heater venting, piping, condensate removal, and wiring into account before installation could result in wasted
time, money, and possible property damage and personal injury.
▪ A. BEFORE LOCATING THE WATER HEATER
WARNING
Incorrect ambient conditions can lead to damage to the heating system and put safe operation at risk. Ensure that the water heater installation
location adheres to the information included in this manual. Failure to do so could result in property damage, serious personal injury, or death.
IMPORTANT
Failure of water heater or components due to incorrect operating conditions IS NOT covered by product warranty.
1. Installation Area (Mechanical Room) Operating Conditions
• Ensure ambient temperatures are higher than 33°F/0.6°C and lower than 120°F/49°C
• Prevent the air from becoming contaminated by the products, places, and conditions listed in this manual.
• Avoid continuously high levels of humidity
• Never close existing ventilation openings
IMPORTANT
The service life of the water heater’s exposed metallic surfaces, such as the cabinet, as well as internal surfaces, such as the heat exchanger, are
directly inuenced by proximity to damp and salty marine environments. In such areas, higher concentration levels of chlorides from sea spray
coupled with relative humidity can lead to degradation of the heat exchanger and other water heater components. In these environments, water
heaters must not be installed using direct vent systems which draw outdoor air for combustion. Such water heaters must be installed using room
air for combustion. Indoor air will have a much lower relative humidity and, hence, potential corrosion will be minimized.
22
WARNING
This water heater is certied for indoor installations only. Do not install the water heater outdoors. Failure to install this water heater indoors could
result in substantial property damage, severe personal injury, or death.
This water heater must be installed as described in this manual: upright, with the vent adapters in the vertical position. DO NOT attempt to install
this water heater in any other orientation. Doing so will result in improper water heater operation and property damage, and could result in serious
personal injury or death.
2. Check for nearby connections to:
• System water piping
• Venting connections
• Gas supply piping
• Electrical power
• Condensate drain
IMPORTANT
Locate the water heater where any leakage from the relief valve, related piping, tank, or connections will not result in damage to surrounding
areas or lower oors of the building. The water heater should be located near a oor 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.
3. Check area around water heater. Remove any combustible materials, gasoline, and other ammable liquids.
WARNING
Failure to keep water heater area clear and free of combustible materials, liquids, and vapors can result in substantial property damage, severe
personal injury, or death.
4. Gas control system components must be protected from dripping water during operation and service.
AP18733 -3 (2/18)
23
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.
Do not introduce toxic chemicals, such as antifreeze or water heater treatments, into the water heater or any piping meant for potable water
purposes.
Ensure that all piping and components connected to the water heater are suitable for potable water applications.
Do not use this water heater for space heating applications.
Circulators suitable for DHW applications must be used.
The service life of the water heater’s exposed metallic surfaces, such as the cabinet, as well as internal surfaces, such as the heat exchanger, are
directly inuenced by proximity to damp and salty marine environments. In such areas, higher concentration levels of chlorides from sea spray
coupled with relative humidity can lead to degradation of the heat exchanger and other water heater components. In these environments, water
heaters must not be installed using direct vent systems which draw outdoor air for combustion. Such water heaters must be installed using room
air for combustion. Indoor air will have a much lower relative humidity and, hence, potential corrosion will be minimized.
6. Clean and ush system when reinstalling a water heater.
NOTE: When installing in a zero clearance location, it may not be possible to read or view some product labeling. It is recommended to make note
of the water heater model and serial number.
▪ B. LEVELING
IMPORTANT
In order for the condensate to properly ow out of the collection system, the water heater must be installed level.
▪ C. CLEARANCES FOR SERVICE ACCESS
See Table 8 for recommended service clearances. If these minimum clearances are not provided, it may not be possible to service the water heater
without removing it from the space.
WARNING
Space must be provided with combustion/ventilation air openings correctly sized for all other appliances located in the same space as the water
heater. The water heater cover must be securely fastened to prevent it from drawing air from the water heater room. This is particularly important if
the water heater is in a room with other appliances. Failure to comply with the above could result in substantial property damage, severe personal
injury, or death.
MINIMUM CLEARANCES
Installation Clearances from Non-Combustibles / Combustibles Recommended Service and Proper Operation Clearances
Top 9 in. (228.6 mm) 9 in. (228.6 mm)
Back 5/8 in. (15.9 mm) 5/8 in. (15.9 mm)
Front 6 in. (152.4 mm)
Right Side
3 in. (76.2 mm) 3 in. (76.2 mm)
Left Side
Bottom 12 in. (304.8 mm) 12 in. (304.8 mm)
Table 8 – Minimum Installation and Service Clearances
NOTE: The exhaust vent piping for this direct vented appliance is approved for zero clearance to combustible construction.
NOTE: If the water heater is installed in a narrow space or corner, ensure that there is sufcient space for service and maintenance access. There
should be easy access to the gas and water lines and internal components for future service. A combustible door or removable panel is acceptable
front clearance.
24 in. (609.6 mm) or more (Front of Water heater)(A combustible door
or removable panel is acceptable front clearance.)
▪ D. RESIDENTIAL GARAGE AND CLOSET INSTALLATIONS
IMPORTANT
Check with your local Authority Having Jurisdiction for requirements when installing water heater in a garage or closet. Please read the entire
manual before attempting installation. Failure to properly take factors such as venting, piping, condensate removal, and wiring into account before
installation could result in wasted time, money, and possible property damage and personal injury.
AP18733 -3 (2/18)
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 oor of the garage, to ensure the burner and ignition devices
are well off the oor.
• Locate or protect the water heater so it cannot be damaged by a moving vehicle.
WARNING
The space must be provided with correctly sized combustion/ventilation air openings for all other appliances located in the space with the water
heater. Do not install the water heater in an attic. Failure to comply with these warnings could result in substantial property damage, severe
personal injury, or death.
▪ E. EXHAUST VENT AND INTAKE PIPE
WARNING
Vents must be properly supported. The water heater exhaust and intake connections are not designed to carry heavy weight. Vent support
brackets must be within 1’ (30 cm) of the water heater and the balance at 4’ (1.22 m) intervals. Venting must be readily accessible for visual
inspection for the rst 3’ (91 cm) from the water heater.
NOTE: To prevent combustion air contamination, see Table 9 in this section when considering exhaust vent and intake pipe termination.
Exhaust vent and intake pipe may be vented vertically through the roof or out a side wall. Venting methods are detailed in the Venting Section. Do
not attempt installation using any other means. Be sure to locate the water heater so exhaust vent and intake piping can be routed through the
building and properly terminated. Exhaust vent and intake piping lengths, routing, and termination method must comply with methods and limits
given in the venting section.
24
▪ F. CARBON MONOXIDE DETECTORS
In the Commonwealth of Massachusetts and As Required by State and Local Codes
Installation of Carbon Monoxide Detectors: At the time of installation or replacement of the vented gas fueled appliance, the installing plumber
or gas tter shall observe that a hard wired carbon monoxide detector with an alarm and battery back-up is installed on the oor level where the
gas appliance is installed, unless the appliance is located in a detached, uninhabitable structure separate from the dwelling, building, or structure
used in whole or in part for residential purposes.
In addition, the installing plumber or gas tter shall observe that a hard wired carbon monoxide detector with an alarm and battery back-up is
installed on each additional level of the dwelling, building, or structure served by the vented gas appliance. It shall be the responsibility of the
property owner to secure the service of qualied licensed professionals for the installation of hard wired carbon monoxide detectors.
a. In the event that the vented gas fueled appliance is installed in a crawl space or attic, the hard wired carbon monoxide detector with
alarm and battery back-up shall be installed on the next adjacent oor level.
b. In the event that these requirements cannot be met at the time of completion of installation, the owner shall have a period of thirty (30)
days to comply with the above requirements; provided, however, that during said thirty (30) day period, a battery operated carbon monoxide
detector with an alarm shall be installed.
WARNING
Failure to comply with these requirements could result in product damage, severe personal injury, or death.
Approved Carbon Monoxide Detectors: Each carbon monoxide detector as required in accordance with the above provisions shall comply with
NFPA 70 and be ANSI/UL 2034 listed and IAS certied.
▪ G. PREVENT COMBUSTION AIR CONTAMINATION
Install intake piping for the water heater as described in the Venting section. Do not terminate exhaust in locations that can allow contamination of
intake air.
WARNING
Ensure that the intake air will not contain any of the contaminants below. For example, do not pipe intake near a swimming pool. Avoid areas
subject to exhaust fumes from laundry facilities. These areas always contain contaminants. Contaminated air will damage the water heater,
resulting in possible substantial property damage, severe personal injury, or death.
AP18733 -3 (2/18)
PRODUCTS TO AVOID AREAS LIKELY TO HAVE CONTAMINANTS
Spray cans containing uorocarbons 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 Auto body shops
Paint or varnish removers Plastic manufacturing plants
Hydrochloric or Muriatic acid Furniture renishing areas and establishments
Cements and glues New building construction
Antistatic fabric softeners used in clothes dryers Remodeling areas
Chlorine-type bleaches, laundry detergents, and cleaning solvents Garages and workshops
Adhesives used to fasten building products
Table 9
NOTE: DAMAGE TO THE WATER HEATER CAUSED BY EXPOSURE TO CORROSIVE VAPORS IS NOT COVERED BY WARRANTY. (Refer
to the limited warranty for complete terms and conditions).
25
▪ H. REMOVING A WATER HEATER FROM A COMMON VENT SYSTEM
DANGER
Do not install the water heater into a common vent with any other appliance. This will cause ue gas spillage or appliance malfunction, resulting in
possible substantial property damage, severe personal injury, or death.
DANGER
Failure to follow all instructions can result in ue gas spillage and carbon monoxide emissions, causing severe personal injury or death.
When removing an existing water heater, the following steps must be followed.
1. Seal any unused openings in the common venting system.
2. Visually inspect the venting system for proper size and horizontal pitch to determine
if there is blockage, leakage, corrosion or other deficiencies that could cause an unsafe
condition.
3. If practical, close all building doors, windows and all doors between the common
venting system and other spaces in the building. Turn on clothes dryers and any
appliances not connected to the common venting system. Turn on any exhaust fans,
such as range hoods and bathroom exhausts, at maximum speed. Do not operate a
summer exhaust fan. Close all fireplace dampers.
4. Place in operation the appliance being inspected. Follow the lighting instructions.
Adjust the thermostat so the appliance will operate continuously.
5. Test for spillage at the draft hood relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle or smoke from a cigarette.
6. After it has been determined that each appliance remaining connected to common
venting system properly vents when tested as outlined, return doors, windows, exhaust
fans, fireplace dampers and any other gas burning appliance to their previous condition
of use.
7. Any improper operation of the common venting system should be corrected so the installation conforms to the National Fuel Gas Code, ANSI
Z223.1. When resizing any portion of the common venting system, the common venting system should be resized to approach the minimum size
as determined using the appropriate tables in Appendix G in the National Fuel Gas Code, ANSI Z 223.1.
▪ I. UNPACKING THE WATER HEATER
WARNING
UNPACKING WATER HEATER – Any claims for damage or shortage in shipment must be led immediately against the transportation company
by the consignee.
AP18733 -3 (2/18)
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.
▪ J. WALL-MOUNTING THE WATER HEATER
WARNING
The water heater must be installed on a wall that can bear its weight (more than 88 lbs. [40 kg] when fully plumbed and full of water). Installing the
water heater on a wall which cannot support its weight could result in property damage, personal injury, or death.
The water heater may be installed on any suitable internal wall (suitable sound-proong may be required when installing onto a stud partition wall).
WARNING
This water heater is too heavy for one person to lift. It is highly recommended to install the water heater with two people. Use caution as to not
drop the water heater, which could damage the water heater and cause property damage and/or severe personal injury. Verify that the water
heater is properly and securely mounted before leaving unsupervised. Failure to comply with the above and properly mount the water heater could
result in substantial property damage, severe personal injury, or death.
This wall mounting system is not seismic rated and should not be applied as such. Failure to comply with the above and properly mount the water
heater could result in substantial property damage, severe personal injury, or death.
POSITIONING THE WATER HEATER ON THE WALL
1. Attach the wall bracket on the location where you want to install the water heater. Ensure it is level and on stud (16" [406 mm] centers)
before proceeding.
2. Mark the two (2) drill holes with a pencil or marker. Remove the wall bracket.
3. Drill two (2) holes using a 15/32" (12mm) drill bit at the marked hole locations.
4. Mount the wall bracket to the wall with the two (2) included anchor bolts. Ensure the mounted bracket is level. Place washers and nuts on
each anchor bolt and tighten. See Figure 4.
5. Align the heater bracket grooves on the back of the water heater with the tongues on the wall bracket and hang the water heater on the
bracket. See Figure 4.
26
Figure 4 – Wall Mounting the Water Heater Top BracketHeater
6. Locate the lower mounting
bracket on the bottom of the water
heater. The two (2) screws and dry
wall anchors will be used to secure
the bottom of the unit to the wall.
7. Mark two (2) holes. Remove the
water heater from the wall.
8. Drill two (2) holes with a 17/64"
(7mm) size bit. Then insert two (2)
dry wall anchors into the wall.
9. Place the water heater back on
the wall as described in Step 5.
10. Screw the two (2) screws into the
dry wall anchors.
Position the bracket securely to the wall.
Afx the screws into dry wall anchors.
Figure 5 – Wall Mounting the Water Heater
AP18733 -3 (2/18)
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