Adjustment - Paloma PH2-20R OFN Engineering Handbook

Adjustment

Adjustment of Burner Control Assembly (PC Board)
The content on this page is intended for use by qualifi ed service personnel only.
WARNING: You will need to perform this procedure when you replace the PCB.
Without this adjustment, the water heater may not function properly.
WARNING: Improper adjustment, alteration, service or maintenance can cause property
damage, personal injury, or death.
Note: During the adjustment procedure if [EE] is displayed on the LED of remote control,
adjust again with caution. This means there was an error in the adjustment sequence.
NOTE: If the value number for the Maximum, Minimum and Slow Ignition manifold setting (01~39) were written down
on the front plate, record these numbers and skip the steps 3 ~ 5.
When replacing the printed circuit board (PCB), adjust as follows.
1. Find the SW1, SW2, SW3 buttons and DIP1 switch located at the top right hand side of the PCB. (See PCB Figure 1)
2. Record any DIP switches setting.
3. With old PCB installed verify minimum manifold pressure setting. The setting value will be displayed on the remote
control.
a. Without any water fl ow, press and hold down the Adjusting Button (SW3)
b. Momentarily press the Minimum Button (SW1)
c. Record the number that displays on the remote control ________________
d. Release the Adjusting Button (SW3)
4. Verify maximum manifold setting. The setting value will be displayed on the remote control.
a. Without any water fl ow, press and hold down the Adjusting Button (SW3)
b. Momentarily press the Maximum Button (SW2)
c. Record the number displayed on the remote control ___________________
d. Release the Adjusting Button (SW3)
Printed Circuit Board (PCB) - Figure 1
- 124 -
PCB Replacement Procedure
ON
2 3 4
1
1 2 3 4
ON
4
1 2 3
1 2 3 4
ADJ
MIN MAX
LED
5. Verify slow ignition manifold setting. The
setting value will be displayed on the remote
DIP 1
control.
a. Find DIP1 and change DIP switch #1
DIP 2
setting of DIP1 to ON position. DO NOT
Adjusting
alter any other DIP switch.
Button (SW3)
b. Without any water fl ow, press the
Maximum Button (SW2), then
Maximum
Minimum Button (SW1) within 2 seconds
Button (SW2)
and hold down both button for more than
Minimum
5 seconds. The "P" is displayed on the LED
Button (SW1)
of remote control.
LED
c. Release the Maximum Button (SW2) and
Program
Minimum Button (SW1), then press and
Chip
hold down the Adjusting Button (SW3) to
change "P" to the value.
d. Record the number displayed on the
remote control __________________
e. Release the Adjusting Button (SW3)
f. Change the DIP switch #1 setting of DIP1
to OFF position. DO NOT alter any other
DIP switch.
6. Turn off power at remote control.
7. Disconnect power from water heater. Turn
off gas and water supply to water heater.