Rheem TRITON Installation guide

TRITON
80 & 100 Gallon Ultra-High
Efficiency Water Heaters
Service and Training Manual
For use with the following models:
GHE80SS, GHE80SU,
GHE100SS, GHE100SU
CATEGORY IV Models
Fan Assisted Combustion
SVC1020T; Revision 4; January 2020

2
Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis
Table of Contents
INTRODUCTION………………………………………………………………….………………….4
SAFETY………………………………………………………………………………………....…….4
SPECIFICATIONS…………………………………………………………………..………………..5
SPEED TABLE ……………………………………………………………………….………….......6
COMPONENT PARTS…………………………………………………………….……….…….......7
WIRING DIAGRAM ……………………………………………….………………………….…….8
CONNECTION DIAGRAM………………………………………….………………………………9
TOP VIEW………………………….…………………………………………………….…………10
PARTS…………………………………………………………………………………….…………11
USER INTERFACE ……………………………...…………………………………….…...........…14
START-UP……………………………………………………………………………………14
TEMPERATURE ADJUSTMENT ..………….…………………………………………………..14
SETTING MENU ……………..……………………………………………………………….14
STATUS MENU ………………………………………………………………….…………....16
SERVICE MENU………………………………………………………………………….…....16
DISPLAY MESSAGES ON CONTROLLER………………………………………………………..18
SEQUENCE OF EVENTS …………………………………………………………………………...19
SEQUENCE OF OPERATIONS ………………………………………..……………...………..…...22
SAFETY FUNCTIONS OF THE CONTROLS……………………………………………………….25
FLAME DETECTION ……………………………………………………………………...……25
ECO (ENERGY CUT-OFF) …...………….…………………………………………..………....25
PRESSURE SWITCHES ………..……………………………………………………………...…25
VENT TEMPERATURE (FLUE GAS) SENSOR.……………………………...................................25
POWER OUTAGES ………………………………………………………………......................26
CONTROLLER RETRY AND IGNITION ATTEMPTS ....……………………….……………….....26
CONDENSATE REMOVAL TUBE …………………....………………………………………......26
ERROR CODES…………………………………………………………….……………...………….27
TROUBLESHOOTING ERROR CODES…………………………………………….……………..31
ERROR A001 IGNITION LOCKOUT…………………………………………………………….31
ERROR A002 FLAME IS NOT STABLE...………….……………………………………………33
ERROR A003 INTAKE SWITCH OPEN…………………………………………………………33
ERROR A004 POF OPEN DURING HEATING…………………………………………………..34
ERROR A005 POF OPEN DURING PRE-PURGE……………..…………………………….........34
ERROR A006 POF OPEN DURING POST-PURGE…..…………………………….......................34
ERROR A007 EXHAUST PRESSURE SWITCH OPEN…………..…………………………….......35
ERROR A008 POF/BLOWER MISMATCH……………………………………………………….35
ERROR A010 END OF LINE TEST FAILURE…..………………..……………………………....35
ERROR A016 ECO SWITCH IS OPEN………………..……………………………...................35
ERROR A017 FLUE HIGH FLUE TEMP………….……………………………………………..36
ERROR A018 FLUE TEMP SENSOR OPEN ……………………………………………………..37
ERROR A019 FLUE TEMP SENSOR SHORTED………………………………………….………37
ERROR A022 UPPER TANK SENSOR IS OPEN…………..………………………………….…..37
ERROR A023 UPPER TANK TEMP TOO HOT……………………………………………….…..38
ERROR A024 UPPER TANK SENSOR SHORTED………………………………………………...38
ERROR A025 NOBLOWER RPM FEEDBACK………………………………………………….38
ERROR A026 BLOWER EXPECTED RPM/ACTUAL RPM MISMATCH………………………….38

Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis
Table of Contents
RHEEM WATER HEATERS
800 Interstate Park Dr.
Montgomery, AL 36109
Website: www.rheem.com
Email: [email protected]
Technical Support Line
Phone: [phone]
Fax: [phone]
Order Center
1-800-621-5622
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.
Copyright 2020, Rheem Manufacturing Company, Water Heater Division.
3
ERROR A027 FLAME PRESENT BEFORE IGNITION........................................................................38
ERROR A028 FLAME PRESENT WITHOUT HEATING...…………………………………………...39
ERROR A029 FAILED IGNITION………………………………………………………………….39
ERROR A030 FLAME LOSS DURING HEATING…………………………………………………...39
ERROR A031 LOSS OF ANODE COMMUNICATION………………………………………………..39
ERROR A033-A043 COMMUNICATION ERRORS………..……………………………...................39
ERROR A044 PROCESSOR CLOCK/LINE FREQUENCY DISAGREE……………………......……......39
ERROR A101 CONFIGURATION DATA RESTORE…………………………………………………..40
ERROR A102 TIME CLOCK NEEDS TO BE PROGRAMMED…………………………………………40
ERROR A103 TIME CLOCK NOT ADVANCING TIME PROPERLY…………………………………..40
ERROR A104 WATER LEAK DETECTED…………………………………………………………..40
ERROR A108 IGNITION BOARD COMMUNICATION FAILURE………………………………………40
ERROR A109 EXTERNAL CO SENSOR ALARM…………………………………………………….40
ERROR A110/A111 SHUT-OFF VALVE MONTHLY TEST CLOSE OPEN ERROR……………………40
ERROR A112 SHUT-OFF VALVE NOT OPEN…………………………………………………….....41
ERROR A121 NOWATER DETECTED INTANK………………………………………………….....41
ERROR T009 NOGAS DETECTED………………………………………………………………….41
ERROR T020-T021 LOWER TANK SENSOR OPEN/SHORTED…….…………………………………41
ERROR T029 FAILED IGNITION-RETRYING…………………………………………………………42
ERROR T032 LOWER TANK TEMP A/D ERROR…………………………………………………......42
ERROR T105 WATER LEAK SENSOR NOT INSTALLED…………………………………………..…..42
ERROR T113-T114 FLAME ROD DEGRADED………………………………………………………...42
ERROR T115-T116 COMBUSTION HEALTH DEGRADED………………………………………….......42
ERROR T117-T120 PERIODIC MAINTENANCE………………………………………………..………42
ERROR T122 NOCOMM WITH POWERED ANODE CONTROLLER FOR >60 SECONDS…………....……43
ERROR T123-T137 ANODE ALERTS………………………………………………………………….43
GAS PRESSURE CHECKING PROCEDURE……………………….……………………………………..48
GAS VALVE ADJUSTMENT PROCEDURE………………………………………………………………49
DISASSEMBLY AND REPAIR……………………………….……………………………………………..50
BACNET CONFIGURATION……………………………………………………………………………….55
LEAKGUARD ………………………………………………….……………….…………………………..60

Introduction
The control system for the fully condensing 80 and 100 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 system 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 settings and to provide additional operational status information.
Safety
ELECTRICAL SHOCK - Troubleshooting and repairing this water heater can expose you to
electrical 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.
WATER TEMPERATURE ADJUSTMENT
Safety and energy conservation are factors to
be considered when selecting the water
temperature setting on the thermostat. Water
temperatures above 1250F 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.
4
FLAMMABLE LIQUIDS AND VAPORS
Gasoline, 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
Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis

Specifications of the TRITON
Models GHE (gas high efficiency gas) 80 and 100 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 and 100 gallons
Rated Gas Input (Btu/Hr.) 130,000; 150,000, 160,000’; 199,000; 250,000; 300,000; 350,000; 399,000
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 1/2“ and 3/4” 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.
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”, & 6” venting options
199kbtu – 2” (, 3”, 4”, & 6” venting options
250-399kbtu –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
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 2100F
Venting Over Temperature Switch; trips at 1600F; automatic reset
Energy Cut Off for high water temperature; trips at 2050F (auto reset) +- 30F
Flame Rectification - The presence of a flame is measured via a flame rod that points
into the flame. Control measures => 8.0 micro amp (uA)
Fuse protected main controller
5
Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis

Speed Table
6
Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis
MODEL NAME MODEL ID FUEL TYPE COMBUSION 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 1Natural Gas 3400 5400 3400 17
Propane 3200 5400 3200
GHE80-160 2Natural Gas 3400 6600 3400 17
Propane 3200 6600 3200
GHE80-200 3Natural Gas 3000 4800 3000 17
Propane 3200 4900 3200
GHE80-250 4Natural Gas 3000 6300 3000 17
Propane 3200 6300 3200
GHE80-300 5Natural Gas 3000 7400 3000 17
Propane 3200 7500 3200
GHE100-130 6Natural Gas 3400 5400 3400 17
Propane 3200 5400 3200
GHE100-160 7Natural Gas 3400 6600 3400 17
Propane 3200 6600 3200
GHE100-200 8Natural Gas 3400 4900 3400 17
Propane 3200 4900 3200
GHE100-250 9Natural 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 3400 8700 3400 17
Propane 3200 7900 3200

Component Parts of the TRITON
7
Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis

Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis
Wiring and Schematic Diagram
8

Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis
Connection Diagram
9

Intake Pressure Switch
POF Switch
Gas Pressure Switch
Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis
Gas Valve
Blower
Ignitor
Ignitor Wire
Leak Sensor
Powered Anode Control
Transformer
Ignition
Control
Top View
10
Low Gas Pressure Switch Flame Rod Wire
Transformer
(Inside View)

Part Name Description Picture
Blower
This is a variable speed blower that is
matched to the Dungs 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
combustion gases at the discharge
vent of the water heater.
This normally closed switch has a
trip setting of 1600F.
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 closer 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.
11
Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis
Parts

Condensate Trap (Included
in the
Exhaust T)
With an efficiency of greater than
95%, 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 rectification response to the
controller.
Main Igniter Controller
The control provides outputs for a
blower motor, high voltage spark
igniter, gas valve, and nonvolatile
storage of fault history. The
control receives inputs from
temperature probe, pressure
switches, Flue gas temperature
sensor, high temperature limit
switches and senses flame. The
control 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 various other
operational characteristics of the
water heater.
12
Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis
Parts

13
Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis
Proof of Fan (Pressure Switch) The PoF pressure switch confirms the blower motor is
running. Each switch is available individually.
Blocked Outlet (Pressure Switch)
The blocked outlet pressure switch is a normally closed
contact that opens with a rise in pressure. Each switch
is available individually
Blocked Inlet (Pressure Switch) The blocked inlet pressure switch is a normally 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 (>2000F).
Lower Temperature Probe This prove provides the lower tank temperature to the
controller.
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

Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis
User Interface
14

Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis
User Interface
15

Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis
User Interface
16

Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis
User Interface
17

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 within the set point limits.
Pre- Purge
17 seconds
An
initial step in a heating cycle wherein the blower is energized to clear any
potential by products 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 energized 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
18
Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis
Display Messages on Control Board

Sequence of Events
19
Is the proof
of fan switch
open?
The Triton ignition control periodically run self check routines for hardware faults.
Any detected fault will lock out the unit and prevent combustion. It will check every
ours and if the condition clears it will return to normal operation. A power cycle may
also clear the condition. Hardware faults are detailed in the use and care manual
The presence of any “A0–series fault will prevent operation. If in a heating cycle
when the alarm occurs combustion will be stopped and the unit will lock out until the
condition is resolved.
Call for heat occurs when tank
temperature is below the set point by
the differential amount
Pre-purge
Set A008 –PoF
Switch/Blower
mismatch
No
Start the blower and
ramp up to purge
speed
Yes
Is the proof
of fan pressure
switch closed
Set A005 –PoF error
during pre-purge
No
Pre ppurge is
17seconds
Yes
Apply spark for 2
seconds
Open gas valve for
3.5 seconds
Is flame
Current ≥0.5µA
Detected?
No
Set A027 –Flame
present before heating
(Requires power cycle
to reset)
Yes
A
D
When the ignition control opens the gas valve it first closes Gas
Valve Relay#1. If it does not sense the relay closed it will set T035
–Gas Relay #1 Stuck Open. The control will continue to try and
close this relay to satisfy heat demand. Gas Valve Relay #1 must
close before closure of Gas Valve Relay #2 is attempted. The T035
Alert will not prevent the combustion system from operating. Any
other Gas Valve Relay alarms (A036, A037, A038) will cause a
Fault condition and prevent combustion system operation
The inlet pressure switch and the exhaust (flue) pressure switches are normally
closed switches. If either switch opens (>4 seconds) at any time the ignition
control will close the gas valve and stop combustion and set the appropriate alarm
code (A003 –Intake Switch Open and A007 –Exhaust Switch Open). The
blower will then run for 30 seconds. If the switch has closed the ignition control
will initiate a call for heat (unless heat demand was satisfied). If the switch is still
open after 30 seconds the blower is secured. If the switch closes and a heat
demand exists the control will initiate a call for heat. All pressure switch
operations require a 4 second persistency to be recognized by the control. The
proof of fan pressure switch is ignored by the control during ignition
E
Concerning the proof of fan switch behavior, if the pressure switch remains open
after the inducer has run 60 seconds, the control will de-energize the inducer for
30 seconds. After 30 seconds, the control verifies the pressure switch remains
open and re-energizes the inducer. If the pressure switch was found closed, the
control changes the fault code to stuck closed switch (A008) and waits indefinitely
for the pressure switch to open. This 60 second run / 30 second off shall continue
as long as a call for heat exists until the pressure switch is proven.
Does a heat
demand exist
Yes
No

Triton Service Manual SVC1020T ; Rev 4
80 and 100 gallon chassis
Sequence of Events
20