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WATER TEMPERATURE CONTROLS
A periodic inspection of the operating controls, heat exchanger and wiring should be made by qualified ser-
vice personnel. Temperature of the water should be tested periodically at the faucet to be sure thermostat
is working properly.
TEMPERATURE ADJUSTMENT
The TPI comes with a factory set temperature setting of 120°F and differential
setting of 10°F. Any temperature adjustment of the thermostat must be made
by qualified service personnel, as shown below.
WARNING: See SERVICE INFORMATION Water Temperature Regulation,
regarding safe water temperature before proceeding. Hot water can cause
scalding injuries.
. Shut off or disconnect all electrical supply to heater.
. Remove cover to TPI control.
3. Adjust right side lever to the desired temperature. Moving lever down will
decrease temperature. (See Figure at right and TPI Diagram 1).
NOTE: Markings on slide are approximate. Check temperature at faucet
to ensure safe operating temperature.
4. Adjust left side lever to the desired differential. (See Figure at right and TPI
Diagram 1) The TPI thermostat will call for heat when the tank temperature
has fallen to the set differential degrees below the temperature set point.
5. Reattach cover.
. Reconnect electrical supply.
7. Check faucet temperature to verify desired temperature is achieved.
In order to set the temperature above 140°F {NOT RECOMMENDED} you must remove the SCALD
DANGER label attached to the temperature slide.
Caution: Do not increase temperature above 140°F without a properly installed mixing valve in the
system – See Water Temperature Regulation and SCALD WARNING.
Indicator Light operation:
The TPI thermostat has an integral indicator light at the top of the case.
(See TPI Diagram 1 or Inside Cover of TPI)
Indicator light will come on (Green) when TPI is powered.
When TPI is calling for heat, the Indicator light will blink.
When TPI is satisfied, the Indicator light will be solid.
During normal operation, Indicator light is Green.
If TPI detects a failure, Indicator light will flash Red. Replace TPI.
EMERGENCY
Should the heater be subject to flood, fire or other damaging conditions, turn the power and water to the
heater off. DO NOT place water heater in operation again until it has been thoroughly checked by qualified
service personnel.
20°
160°
150°
15°
140°
130°
10°
120°
5°
110°
Differential
Temperature
LED
flashing green = calling for heat
solid green = at temperature
red = error
Pump/TT
24v
Probe
9
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