Paloma PH2-20R DVSN, Engineering Handbook

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Adjusting of Burner Manifold setting on the new PCB if the old PCB was completely broken or
you could not get the value number [01 - 39].
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.
1. Turn off power at remote control. Disconnect power from water heater. Turn off gas and water supply to water
heater.
2. Record any DIP switches setting.
3. 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.
4. Remove the old PCB.
5. Install the new PCB.
6. 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.
7. Adjust the DIP switch setting, if necessary,
for high altitude setting, etc. Figure 2
8. Remove the plug for the manifold pressure and connect the manometer.
9. Reconnect power to water heater.
10. Do Not turn on remote control.
Note: Always start from “Minimum” when adjusting the burner manifold pressure setting.
11. Adjustment of manifold pressure
Measurement of Fan Pressure
Measure the fan pressure before adjusting the burner manifold pressure. The fan pressure differs depending on
models, types of gas or installation condition. Measure the fan pressure at each installation site.
(1) Measurement of minimum capacity.
a. At the condition that the remote control is off and with any water fl ow, press and hold down the Minimum
Button (SW1) on the PCB.
b. Using the manometer, measure and record the minimum fan pressure (within 20 seconds).
(2) Measurement of maximum capacity.
a. At the condition that the remote control is off and with any water fl ow, press and hold down the Maximum
Button (SW2) on the PCB.
b. Using the manometer, measure and record the maximum fan pressure (within 20 seconds).
12. Adjustment of minimum manifold setting
a. Turn on gas supply
(Note: ensure there are no gas leaks). Turn on water supply (Note: ensure there are no
water leaks).
b. Turn on remote control.
c. Open the hot water tap gradually until the water heater ignites at the minimum operating water fl ow.
d. Press and hold down the Adjusting Button (SW3).
e. While holding the Adjusting Button (SW3); momentarily push the Minimum Button (SW1) on the PCB.
(Note: It becomes to the minimum setting forcibly when the water is fl ow.)
Using the manometer, adjust the minimum manifold pressure to the standard pressure (see table below) plus the
previous recorded minimum fan pressure in step 11. (1) b.
f. Every time you press the Minimum Button (SW1), the displayed value is [UP] or [DOWN]. Adjust the value at the
manometer.
g. After adjusted, release the Minimum Button (SW1) fi rst, then release the Adjusting Button (SW3).