Service Manual

Page 27
Step1. Position gas control power switch to the “OFF” position.
Step 2.Remove pressure tap plug (3/16" hexwrench) and install
1/8" NPT pipe, coupling, & pressure tap.
Step 3. Connect manometertopressure tap.
Step 4. Follow instructions locatedonthe lighting
instructions la
bel and proceed to lightthe main
burner and observe manometerreading.
Step5. Proper operating range for naturalgas is: 5.0" ±0.5" w.c.
Step6. Ifpressure is within the range specifiedinth
e previous
step, position gas control power switch to the “OFF”
position, remove manometer and pressure tap, and
replace pressure tap plug. Check for gas leaks priorto
placing water heater back intooperation by following
the instructions
locatedonthe lighting instruction labelor
the lighting instructions locatedinthe installation and
operation manual.
Step7. Ifgas pressure is outside the specification noted above,
refer to “Gas Control Testing and Replacement” to replace
Gas Control or v
alve body.
TheHoneywell Gas Control is designedwith an ECO device that will reset.
To resetthe Gas Control after an error code (4), rotate the set-point knob to the minimum temperature sett
ing for at least
6 seconds and then rotate the set-point knob clockwise by at least 45
o
. This will resetthe gas control and return the water
heatertonormaloperation.
ECO (Energy Cut Out) Testing
Gas Control shown in the “OFF” position
Pressure Tap
Shown Installed
ManifoldPressure Testing (this procedure presumes a maximum line pressure of 14.0"
w.c.)
Pressure Tap
Plug
UTTW SERVICE PROCEDURE VII
Gas Control Testing and Replacement
R
27