Rheem TRITONTM
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
