Rheem GHE80SS Installation guide

SERVICE &
TRAINING
MANUAL
80, 100 & 119 GALLON ULTRA-HIGH
EFFICIENCY WATER HEATERS
For use with the following models:
GHE80SS, GHE80SU, GHE100SS,
GHE100SU, GHE119SS, GHE119SU
CATEGORY IV Models
Fan Assisted Combustion
AP23084 Rev 01

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Service Manual 2
CONTENTS
INTRODUCTION .........................................................................................................................4
SAFETY .......................................................................................................................................4
SPECIFICATIONS OF THE TRITON ...........................................................................................5
SPEED TABLE.............................................................................................................................6
COMPONENT PARTS .................................................................................................................7
WIRING AND SCHEMATIC DIAGRAM .......................................................................................9
TOP VIEW ...................................................................................................................................11
PARTS.........................................................................................................................................13
NAVIGATING THE HOME SCREEN ..........................................................................................16
USER INTERFACE .....................................................................................................................17
DISPLAY MESSAGES ON CONTROL BOARD.........................................................................20
SEQUENCE OF EVENTS ...........................................................................................................21
SEQUENCE OF OPERATIONS..................................................................................................24
SAFETY FUNCTIONS OF THE CONTROLS .............................................................................28
ERROR CODES..........................................................................................................................30
TROUBLE SHOOTING ERROR CODES ...................................................................................33
GAS PRESSURE CHECKING PROCEDURES .........................................................................49
TRITON DISASSEMBLY AND REPAIR (VIDEO LINKS)..........................................................................53
DISASSEMBLY AND REPAIR ....................................................................................................54
BACNET CONFIGURATIONS ....................................................................................................60
LEAK GUARDTM..........................................................................................................................64

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Service Manual
3
WA RNING
!
TECHNICAL SUPPORT LINE
PHONE: [phone]
FAX: [phone]
ORDER CENTER
1-800-621-5622
RHEEM WATER HEATERS
800 Interstate Park Dr.
Montgomery, AL 36109
Website: www.rheem.com
Email: T[email protected]
Copyright 2022, Rheem Manufacturing Company, Water Heater Division
Before inspecting, diagnosing, repairing or operating any water heater, be sure to examine all of
the safety and warning labels on the tank. Follow the instruction on these warning labels. Read and
understand the Use and Care Manual that was shipped with the water heater. Failure to do so can
result in unsafe operation of the water heater resulting in property damage, bodily injury, or death.
Should you have any problems reading or following the instructions in the Use and Care Manual,
seek the help of a licensed and qualified professional.

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Service Manual 4
The control system for the fully condensing 80, 100, and 119 gallon Gas High Efficiency (GHE)
Commercial Gas Water Heater is intended for use indoors. The control combines all operational
functions needed for a water heater with a powered burner system into a single printed circuit
board package. The control inputs are from a water temperature probe, pressure switches, flue gas
temperature sensor, high temperature limit switch and flame sensor. The control provides outputs
for a blower motor, spark igniter, gas valve, and has a nonvolatile storage of fault history. The sys-
tem incorporates a liquid crystal display (LCD) as the interface for the customer to control heater
function. The user interface consists of buttons for scroll through system menus, adjustment of set-
tings and to provide additional operational status information.
ELECTRICAL SHOCK - Troubleshooting and repairing this water heater can expose you to electri-
cal shock. Some of the diagnostic procedures require the presence of 120 volt AC electricity. Use
extreme caution when performing these procedures. When replacing an unserviceable component,
turn off all power to the water heater and check for the presence of power with a multi-meter or test
lamp. The ignition cable carries more than 10,000 volts of electrical energy. Use extreme caution
when diagnosing the Ultra High Efficiency Water Heater.
FLAMMABLE LIQUIDS AND VAPORS - Gas-
oline, as well as other flammable material and
liquids (adhesives, solvents, etc.), and vapors
they produce are extremely dangerous. DO NOT
handle, use or store gasoline or other flammable
or combustible materials anywhere near or in the
vicinity of a water heater. The spark ignition and
burner assembly in the water heater controls can
ignite these vapors. Failure to do so can result in
property damage, bodily injury or death.
WATER TEMPERATURE ADJUSTMENT -Safety and energy conservation are factors to be con-
sidered when selecting the water temperature setting on the thermostat. Water temperatures above
125°F can cause severe burns or death from scalding. The chart shown here may be used as a
guide in determining the proper water temperature for your application.
INTRODUCTION
SAFETY
!
!
FLAMMABLES
Flammable Vapors
FIRE AND EXPLOSION HAZARD
Can result in serious injury or death.
Do not store or use gasoline or other flammable vapors and liquids
in the vicinity of this or any other appliance. Storage or use of gasoline
or other flammable vapors or liquids in the vicinity of this or any other
appliance can result in serious injury or death.
WARNING
TIME / TEMPERATURE RELATIONSHIPS IN SCALDS
Temperature Time to Produce Serious Burn
120° F (49°C) More than 5 minutes
125° F (52°C) 1½to 2 minutes
130° F (54°C) About 30 seconds
135° F (57°C) About 10 seconds
140° F (60°C) Less than 5 seconds
145° F (63°C) Less than 3 seconds
150° F (66°C) About 1½seconds
155° F (68°C) About 1 second
Table courtesy of Shriners Burn Institute

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Service Manual
5
SPECIFICATIONS OF THE TRITON
Models
GHE (gas high efficiency gas) 80, 100 and 119 gallon (tank capacity)
Powered direct vent; sealed combustion; fully condensing; ASME rating options on all inputs;
power vent options on all inputs.
Fuel Type Natural and L.P. gas; thermal efficiency based on model
Gallon Capacity 80,100 and 119 gallons
Rated Gas Input (Btu/Hr.) 130,000; 160,000; 199,900; 250,000; 300,000; 350,000; 399,900; 499,900
Ignition System Spark ignition to main burner; no pilot of any kind
Heat Exchanger Down fired, multi-pass heat exchanger
Diagnostics
Nonvolatile storage of heater settings and fault history. Diagnostic codes provided through an
onboard LCD display consisting of information on power to the control, control status, fault codes
and system settings.
Installation Indoor only
Gas Connection 3/4” NPT Female and 1 1/4” NPT Female
Inlet Gas Pressure Natural Gas Min. 3.5” w.c. Max. 10.5” w.c.
L.P. Gas Min. 11.0” w.c. Max. 13.0” w.c.
High Altitude Units rated to 8,999ft. GHE119 up to 10k ft
Water Connection 2” NPT inlet/outlet – side connect – front and rear
1.5” for Top (Plugged from factory)
Vent Material Allowed
Polypropylene, PVC, ABS, CPVC plastic pipe options
130-160kbtu – 2”, 3” & 4” venting options
199-499kbtu – 3”, 4” & 6” venting options
SEE USE AND CARE MANUAL
Maximum Vent Lengths SEE USE AND CARE MANUAL
Noise Level 60 db @ 15 feet (max) using test ANSI S12.34/ISO 3744
Water Temperature
Factory Setting 120°F
Digital Thermostat (adjustable) 1 degree increments
85°F to 185°F
Temperature Differential Factory Setting of 12°F
User selectable from 1°F to 30°F
Electrical
Electrical Rating 120 VAC 50/60Hz, 7 Amps
Wire 3 (three) wire (hot, neutral, ground)
Earth Ground Sensitive Yes
Polarity Sensitive Yes
Safety Devices
Temperature and Pressure Relief Valve – 150 PSI or 210°F
Venting Over Temperature Switch; trips at 160°F; automatic reset
Energy Cut Off for high water temperature; trips at 205°F (auto reset) +- 3°F
Flame Rectification - The presence of a flame is measured via a flame rod that points into the
flame. Control measures => 0.5 micro amp (uA)
Fuse protected main controller

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Service Manual 6
SPEED TABLE
Model Name Model ID Fuel Type
Combustion Blower Speed (RPM) Purge Timing
(Seconds)
Min. Speed Max. Speed Ignition Speed
Model Not
Selected 0 N/A N/A N/A N/A N/A
GHE80-130 1
Natural Gas 3400 5400 3400
17
Propane 3400 5400 3200
GHE80-160 2
Natural Gas 3400 6600 3400
17
Propane 3200 6600 3200
GHE80-200 3
Natural Gas 3000 4800 3000
17
Propane 3200 4900 3200
GHE80-250 4
Natural Gas 3000 6300 3000
17
Propane 3200 6300 3200
GHE80-300 5
Natural Gas 3000 7400 3000
17
Propane 3200 7500 3200
GHE100-130 6
Natural Gas 3400 5400 3400
17
Propane 3200 5400 3200
GHE100-160 7
Natural Gas 3400 6600 3400
17
Propane 3200 6600 3200
GHE100-200 8
Natural Gas 3400 4900 3400
17
Propane 3200 4900 3200
GHE100-250 9
Natural Gas 3400 6300 3400
17
Propane 3200 6300 3200
GHE100-300 10
Natural Gas 3400 7400 3400
17
Propane 3200 7600 3200
GHE100-350 11
Natural Gas 3400 7800 3400
17
Propane 3200 6900 3200
GHE100-400 12
Natural Gas 3400 8700 3400
17
Propane 3200 7900 3200
GHE119-500 13
Natural Gas 2800 8850 2800
25
Propane 2800 8850 2800

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Service Manual
7
COMPONENT PARTS GHE80SS, GHE80SU, GHE100SS, GHE100SU

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Service Manual 8
COMPONENT PARTS
GHE119SS, GHE119SU
Water Flow Sensor
(SS Only)
Auto Shut-off
(SS Only)
Diffuser
Nipple
Control Board
Display Kit
Relief
Valve
Water Temperature
and ECO Probe
Power Anode
Power Anode
Power Anode
Power Anode
Lower
Thermostat
Transformer Wire
Harness
Hand Hole
(under cover)
Drain Valve
Exhaust Tee
Assembly
On / Off Switch
POF & Intake
Pressure
switch
Blower / Gas Valve /
Burner Assembly Kit
Igniter Kit
Burner
Igniter Kit
Blower Gasket
Gas Valve
Blower
Venturi
Venturi Gasket
Burner
Gasket

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Service Manual
9
WIRING AND SCHEMATIC DIAGRAM GHE80SS, GHE80SU,
GHE100SS, GHE100SU
AX5631

Rheem TRITONTM
Service Manual 10
WIRING AND SCHEMATIC DIAGRAM
GHE119SS, GHE119SU

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Service Manual
11
TOP VIEW GHE80SS, GHE80SU, GHE100SS, GHE100SU
Ignition Control
Ignitor
Blower
Gas Valve
Powered
Anode Control
Ignitor Wire
Flame Rod Wire
POF Switch
Intake Pressure Switch
Low Gas Pressure Switch
Transformer
Transformer
(Inside View)
BOTTOM OF WATER HEATER
Leak Sensor

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Service Manual 12
TOP VIEW GHE119SS, GHE119SU GHE119SS, GHE119SU
Ignition Control
Powered
Anode Control
Ignitor Wire
Flame Rod Wire
POF Switch
Transformer
Ignitor
Gas Valve
Blower
Intake Pressure Switch

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Service Manual
13
Part Name Description Picture
Blower
This is a variable speed blower by Fasco,
is matched to gas valve. The speed and
function of the blower is monitored by the
main controller.
Gas Control Valve
The gas valve, by Honeywell, is matched
to the blower motor. Their functions are
controlled by the primary controller.
Flue Gas Temperature Sensor – Exhaust
Measures the temperature of the com-
bustion gases at the discharge vent of the
water heater.
This normally closed switch has a trip set-
ting of 160°F.
Power Anode Controller
The power anode controller controls the
current flowing through each anode.
The anode system is protecting the tank
against corrosion. The power anodes can
be checked through menu options under
“system” and check “tank health” to see
the power output of the anodes. The clos-
er to 100% power, the more bare metal
there is in the tank. Anode controller has
LED flash code indicators to determine
if there is communication between the
controller and anodes. Anodes can be
unplugged if anode or wiring is damaged.
Condensate Trap
(Included in the Exhaust T)
With an efficiency of greater than 90%,
this unit will create much condensation
inside the flue tubes. The condensate trap
allows for the controlled evacuation of the
condensation to a local drain. (See local
codes)
Igniter and Flame Probe Provides spark to burner and flame rectifi-
cation response to the controller.
PARTS

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Service Manual 14
Part Name Description Picture
Main Igniter Controller
The control provides outputs for a blow-
er motor, high voltage spark igniter, gas
valve, and nonvolatile storage of fault his-
tory. The control receives inputs from tem-
perature probe, pressure switches, Flue
gas temperature sensor, high temperature
limit switches and senses flame. The con-
trol makes 9 tries of 3 attempts (total of 27
tries) for ignition. If no ignition, the control
waits for one hour before re-attempting
ignition.
LCD Display and User Control Panel
Color LCD with touch sensitive overlay
for user interface. Displays tank set point
temperature, operational state, and var-
ious other operational characteristics of
the water heater.
Proof of Fan (Pressure Switch)
The PoF pressure switch confirms the
blower motor is running. Each switch is
available individually.
Switch is normally open.
Blocked Inlet (Pressure Switch)
The blocked inlet pressure switch is a nor-
mally closed contact that opens with a fall
in pressure.
Each switch is available individually
Water Temperature and ECO Probe
This probe provides the water temperature
to the controller; and also provides an
energy cut off in the event the water gets
too hot (>200°F).
Lower Temperature Probe This probe provides the lower tank tem-
perature to the controller.
PARTS

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Service Manual
15
Part Name Description Picture
Leak Sensor
This sensor detects water when 2.5-5mL
of water is present. It is installed in the
bottom pan of the unit and has a splash
proof guard above it so tank condensation
or sprayed water will not activate it. Unit
can operate with sensor unplugged but
the display will flash an alert stating that
the leak sensor is disconnected. Factory
setting for leak detection is to “Alert Only”.
Can be changed to “Disable”(Shut down
the unit if a leak is detected.)
Burner
The burner in a combustion chamber
maintains a controlled flame by giving the
flame a structure to rest on.
PARTS

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Service Manual 16
NAVIGATING THE HOME SCREEN
Status: Standby
StatusSettings
warm hot very hot
Disable
120°
Service
Operating Status
Setting Menu
Button Status Button Service Menu
Button
Enable/Disable
Button
Rapid Temperature
Adjustment
WiFi Indicator
and Settings
Health Indicator
Icons
Temperature
Setting
Temperature
Adjustment
STARTUP - Once power is applied to the water heater and the
On button is pressed, the Startup Wizard on the LCD will go
over the below features:
1. Setting of Time and Date
2. Setting Hours of Operation for the business
3. Wifi Setup
Follow the on-screen instructions to complete setup.
Some of these items can be skipped if a later setup is
desired.
ENABLING (TURNING ON) THE UNIT
TEMPERATURE ADJUSTMENT - Tank temperature will be
maintained according to the setting on the home screen. If
the water temperature setting needs adjustment, use the
arrows on the display to select desired temperature.
The display also has a rapid temperature adjustment fea-
ture that corresponds to the below temperature settings.
Warm: 110°F
Hot: 140°F
Very hot: 180°F
Touching the text ‘warm’, ‘hot’, or ‘very hot’ will adjust the
temperature to the above temperature setting.
SETTING MENU -
The settings function on the water heater
display allows access to the basic settings, configurations,
schedules, bacnet, and the time/date.
Status: Standby
Water Heater Disabled
StatusSettings Enable
Service
Press the enable button to
turn the water heater on
Pressing the settings button will allow
access to water heater settings
Status: Standby
StatusSettings
warm hot very hot
Disable
120°
Service
settings
wifi setup
bacnet time/date
basic configs schedule

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Service Manual
17
BASIC SETTINGS - The basic settings in your water heater
can allow you to change the temperature unit, screen adjust-
ment lock/unlock, enabling/disabling the alarm beep, and your
EcoNet network instance. Simply select the setting by tapping
it, and press the Up/Down arrows to make adjustments. WiFi
setup can be accessed from this screen as well.
CONFIGURATION SETTINGS - The configuration settings on
your water heater allows you to control the differential tempera-
ture set point, turning on/off the recirculation pump, auxiliary
input/output, enabling/disabling modulation, and how your hot
water heater reacts to a detected leak.
The setting can be highlighted by tapping and then adjusted
with the up/down arrows.
The Differential can be adjusted from 1°F to 30°F. The recom-
mended differential is 12°F.
This water heater has a modulation algorithm that can be dis-
abled by tapping ‘No’ in front of Modulation Disabled and mak-
ing adjustments by tapping the up/down buttons.
Water heater behavior in response to leak can be changed from
Alarm Only to Disable When Leak Detected.
Shutoff Valve (on premium models only) behavior response can
be selected to the following:
• Open
• Closed
• Close if Leak Detected: Always close the valve when leak
is detected.
• Close if Unocc. Leak Detected (based on unoccupied
times from the schedule function). Water heater will alarm
only during the operating hours.
SCHEDULE SETTINGS: The schedule settings allows you to
control when your hot water heater will be enabled/disabled.
Your heater allows you to select a day you want and set the
times when the heater will be in use. You can also copy/paste
the day you select and apply it to other days as well.
TIME/DATE SETTINGS: By selecting time/date you can
change the water heaters current set time. You can also select
the daylight savings time function to automatically adjust the
time for daylight savings.
BACNET - This water heater is compatible with BacNet MS/TP
protocol. Please refer to the GHE BacNet instruction sheet for
details on the setup.
USER INTERFACE
basic settings
Temperature Display
Screen Adjustment Lock?
Beep On Alarm
EcoNet Network Instance
Elevation
Fahrenheit
No
Enabled
1
Normal
config. settings
Differential Temp Setpt.
Recirc. Pump Config
Aux Output Select
Modulation Disabled?
When Leak Detected
Shutoff Valve Config
12.0° F
Off
None
No
Alarm Only
Closed if Leak Detected
schedule settings Wed. Jan.11, 2:49 pm
Morning:
Night:
Mon.
08:00 am
06:00 pm
Time
Occupied
Occupied
Schedule
Tue.
copy
day
paste
day cancel
Wed. Thu. Fri. Sat. Sun.
The up/down arrows
enable you to adjust the
time of the morning/night
run times.
By selecting a day and then access-
ing the copy function, you can paste
that day’s settings onto other
set to time and date
accept D.S.T.
enabled
:
10 54 am
:
Jan. 11 2017
The D.S.T function allows you to adjust
the time for daylight savings time. The up/down arrows
allow you to control
the time, month, day,
and year.

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Service Manual 18
STATUS MENU - The Status screen provides information on
the current operating status, diagnostics and sensors. This
screen also provides information on the WiFi status.
WI-FI STATUS - After selecting the Wi-Fi status function, you
will be brought to a prompt showing you the current state of
your water heater’s Wi-Fi and the ability to set-up your water
heater’s Wi-Fi.
MORE FUNCTION - Selecting the more function your heater
will bring you to a prompt showing you the current temperatures
of the lower/upper tank, Flue temperature, ECO switch state,
and Auxiliary relay state.
SERVICE MENU - The service screen provides information
on the product description, alarms, system health, and service
alerts. Alarm details can be found in the “Before You Call Ser-
vice” section of the manual.
In case there is an active alarm, the “Service” button will blink
on the home screen. Pressing the “Service” button will show a
new screen containing the active alarms and alarm history.
USER INTERFACE
By pressing the Status button, you will
be taken to a prompt showing the state
of your water heater’s many features.
Status: Standby
StatusSettings
warm hot very hot
Disable
120°
Service
By selecting Wi-Fi status, you can
access the status of your water
heater’s Wi-Fi and even set it up.
By selecting more, you can access
the temperatures of your water
heater, ECO switch state, and
auxiliary switch state.
Status: Standby
Gas Line Press. Switch
Gas Valve State
Fan Prove Press. Switch
Air Intake Press. Switch
Exhaust Press. Switch
Current Fan Speed
Flame Current
Open
Closed
Open
Closed
Closed
0 RPM
0.0 uA
morewifi status
Selecting the Wi-Fi setup function will bring you to a prompt
allowing you to connect your water heater to your home Wi-Fi.
wifi status
WiFi Device Status............
WiFi Signal Strength [dBm]....
Econer wifi SW Version........
WiFi Module SW Version........
MAC Address...................
SSID..........................
IP Address ...................
Subnet Mask...................
Gateway.......................
Ready To Connect
0
RH-WIFI-02-01-05
14.76.36.P103
F0-03-8C-B3-C6-CC
wifi setup
Status: Standby
Upper Tank Temp
Lower Tank Temp
Flue Temperature
ECO Switch State
Auxiliary Relay State
159.8°
68.6°
92.7°
Closed
None
By selecting the service function, you will be taken to a prompt giving you access
to the heater’s alarms, health, and alerts.
Status: Standby
StatusSettings
warm hot very hot
Disable
120°
Service
Current Alarms and Alarm
History allows you to access
any current alarms that have
been tripped and view a list
of previous alarms.
System Health
will show you the
status of the tank’s
combustion health
and overall tank
health.
Service Alerts will allow you
to set how often you want to
be alerted to check venting,
clean the drain trap, replace
the neutralizer, and to drain
and inspect the tank.
service
Product Model Number:
Product Serial Number:
Software Version Number: WH-GHE1-00-00-86
current
alarms
alarm
history
system
health
service
alerts

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Service Manual
19
USER INTERFACE
ALARMS - The current alarms function allows you to see any
problems that have been detected by your water heater. Also,
by selecting on the current alarm you can press “more info” to
read more on the current problem of your water heater. Alarm
history allows you to see any of the previous alarms that have
gone off in the past and give you the ability to clear those previ-
ous alarms.
ALARM HISTORY - The alarm history function allows you to
see the previous alarms that have been detected by your water
heater in the past.
SYSTEM HEALTH - The system health function allows you to
see the current health of your hot water heater’s combustion
health and tank health status. The combustion health and tank
health each have three levels of health:
SERVICE ALERTS - By selecting the Service alerts function
you will be able to adjust how often you want to be alerted to
drain and inspect the tank, clean the drain trap, check the vent-
ing, and to replace the neutralizer.
service alerts
Drain & Inspect Tank:
Check Venting:
Clean Drain Trap:
Replace Neutralizer:
Enabled
Enabled
Enabled
Enabled
9 months
6 months
1500 hours
1500 hours
9.0 left
6.0 left
1500 left
1500 left
The health of your system’s combustion system and overall health can
be seen here. This screen be accessed by tapping the health indicator
icons on the home screen.
This symbol will appear on your home
screen if your combustion health is crit-
ical. Pressing this icon will take the user
to the Health Status Screen
This symbol will appear if your tank
health status has reached critical.
Pressing this icon will take the user
to the System Health Screen
By selecting an option and then using the up and down arrow, you
can set how often you’d like to be alerted to system maintenance.
current alarms
A007 Exhaust Switch open. Check Wiring/Venting
more
info clear
By selecting “more info” you can be
given a more in-depth explanation of
the current alarm.
Trouble-Shooting
A007 Exhaust Switch open. Check Wiring/Venting
Check switch wiring and venting. If problem
persist, please contact technical support or
service provider.
alarm history
14:48:13 01/11/17 A007 Echaust Switch open. Check wiring/venting
clear
Combustion Health:
1. Normal operation -no
action needed
2. Reliability Decreasing
-begin planning for service
and/or replacement.
3. Needs Servicing - contact
your service provider
Tank Health:
1. Powered anode protecting
tank - no action needed
2. Anode protection ending
-begin planning for service
and/or replacement.
3. Anode no longer protecting
tank. -contact your service
provider.
system health
baseline init
(typical 10K cyc/yr)
(typical 2K hrs/yr)
Combustion Health Status: Operating Normally
Tank Health Status: Powered Anode Protecting Tank
Lifetime Heating Cycles:
Lifetime Run Time Hours:
6
750.0
Status: Standby
StatusSettings
warm hot very hot
Disable
120°
Service

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Service Manual 20
DISPLAY MESSAGES ON CONTROL BOARD
Status Message Description
Water Heater Disabled The water heater is disabled and not in any active mode.
Standby The water heater is in a non-active mode where the temperature of the water in the tank is with-
in the set point limits.
Pre- Purge An initial step in a heating cycle wherein the blower is energized to clear any potential by prod-
ucts of combustion from the heat exchanger.
Ignition The ignition system and gas valve are energized during this period. Igniter should be sparking
and gas valve should be releasing fuel.
Heating This message appears when a call for heat is present and the burner is actively firing.
Post Purge When the call for heat is satisfied, the gas valve is de-energized while the blower remains ener-
gized to clear the heat exchanger.
Retry Test failed ignition and it is retrying
Recycle The water heater is in the 30 minute delay between retries
Fault The water heater is experiencing a malfunction and displaying an error code
Ign. Control Comm Error The display is not communicating with the ignition control