Paloma PH2-20R OFN Engineering Handbook page 125

8. Carefully remove the existing program chip,
see fi gure 1 for location. Lightly grip the edges
of the chip, top and bottom, as in fi gure 2, and
pull the chip straight out from the PCB and set
it aside.
9. Remove the old PCB.
10. Install the new PCB.
11. Gripping the removed program chip, as in
fi gure 2, carefully align and insert the chip into
the socket on the PCB. Do Not Force.
12. Adjust the DIP switch setting, if necessary,
for high altitude setting, etc.
Adjustment of Burner Manifold settings on the new PCB.
Note: Always start from "Minimum" when adjusting the burner manifold pressure setting.
The display is on remote control. Always connect the remote control to monitor this procedure.
13. Reconnect power to water heater.
14. Adjustment of minimum manifold setting
a. Repeat steps 3.a. and 3.b. from the above procedure. If the recorded value does not agree with current value then
proceed to next step. If the value does agree then move onto step 14.d.
b. Without any water fl ow, press and hold down the Adjusting Button (SW3)
c. While holding the Adjusting Button (SW3); momentarily push the Minimum Button (SW1) on the PCB. The current
number [01 - 39] is displayed on the LED of remote control. Continue to momentarily press the Minimum
Button (SW1) until you get to the value recorded in step 3.c.
d. Release the Minimum Button (SW1) fi rst, then release the Adjusting Button (SW3).
Note: Every time you press the MINIMUM (SW1) Button, the display will cycle up to the
number 39. Once it reaches 39, it will automatically reverse and cycle back down to 01.
15. Adjusting of maximum manifold setting
a. Repeat steps 4.a. and 4.b. from the above procedure. If recorded value does not agree with the current value then
proceed to next step. If the value does agree then move onto step 15.d.
b. Without any water fl ow, press and hold down the Adjusting Button (SW3)
c. While holding the Adjusting Button (SW3); momentarily push the Maximum Button (SW2) on the PCB. The
current number [01 - 39] is displayed on the LED of remote control. Continue to momentarily press the Maximum
Button (SW2) until you get to the value recorded in step 4.c.
Note: Every time you press the MAXIMUM (SW2) Button, the display will cycle up to the
number 39. Once it reaches 39, it will automatically reverse and cycle back down to 01.
d. Release the Maximum Button (SW2) fi rst, then release the Adjusting Button (SW3).
16. Adjusting of slow ignition manifold setting
a. Repeat steps 5.a., 5.b. and 5.c. from the above procedure. If recorded value does not agree with the current value
then proceed to next step. If the value does agree then move onto step 16.c.
b. Press and hold down the Adjusting Button (SW3). The current number [01 - 39] is displayed on the LED of remote
control. Continue to momentarily press the Maximum Button (SW2) for increasing the number or the Minimum
Button (SW1) for decreasing the number on the PCB until you get to the value recorded in step 5.d.
c. Release the Adjusting Button (SW3).
17. Attach the unit's front cover.
18. Turn on gas supply (Note: ensure there are no gas leaks). Turn on water supply (Note: ensure there are no water
leaks).
19. Turn on remote control.
20. Check and ensure safe operation and performance of the water heater.
Figure 2
- 125 -