Bradford White U-TW4-75S-76R-3N - Manual (Page 27)

Page 27
Step 1. Position gas control power switch to the “OFF” position.
Step 2. Remove pressure tap plug (3/16" hex wrench) and install
1/8" NPT pipe, coupling, & pressure tap.
Step 3. Connect manometer to pressure tap.
Step 4. Follow instructions located on the lighting
instructions label and proceed to light the main
burner and observe manometer reading.
Step 5. Proper operating range for natural gas is: 5.0" ±0.5" w.c.
Step 6. If pressure is within the range specified in the 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 prior to
placing water heater back into operation by following
the instructions located on the lighting instruction label or
the lighting instructions located in the installation and
operation manual.
Step 7. If gas pressure is outside the specification noted above,
refer to “Gas Control Testing and Replacement” to replace
Gas Control or valve body.
The Honeywell Gas Control is designed with an ECO device that will reset.
To reset the Gas Control after an error code (4), rotate the set-point knob to the minimum temperature setting for at least
6 seconds and then rotate the set-point knob clockwise by at least 45
o . This will reset the gas control and return the water
heater to normal operation.
ECO (Energy Cut Out) Testing
Gas Control shown in the “OFF” position
Pressure Tap
Shown Installed
Manifold Pressure Testing
(this procedure presumes a maximum line pressure of 14.0"
w.c.)
Pressure Tap
Plug
U TTW SERVICE PROCEDURE VII
Gas Control Testing and Replacement
R
27