Paloma PH2-20R OFN Engineering Handbook page 156

Chip Installation
1. Make sure electrical power is disconnected and turn off
gas and water to the water heater, then remove the front
cover from the water heater.
2. Carefully remove the existing program chip, see Figure
1 for location. Lightly grip the edges of the chip, top and
bottom, as in Figure 2, and pull the chip straight out from
Control Board
- Figure 1
Program Chip Initiation
5. Find the two DIP switches located at the top right hand
side of the PCB. The switch labeled "DIP1" in the top
switch.
6. Change the DIP Switch #4 setting to the "ON" position.
DO NOT alter any other DIP Switch. The LED on the
PCB is fl ashing. At the same time, the display of the Main
Remote Control starts to fl ash.
7. Press the "Max" button located at the top right hand side
of the PCB for more than 1 second. The LED on the PCB
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Chip Installation and Initiation
ON
1 2 3 4
1 2 3 4
ON
Dip
1 2 3 4
1 2 3 4
Switches
ADJ
MIN MAX
LED
LED
Program
Chip
the Control Board and set it aside.
3. Remove the replacement chip from the packaging.
Gripping the chip, as in fi gure 2, carefully align and insert
the chip into the socket on the control board. Do Not Force
4. Restore power to the unit.
PRIORITY
°F
POWER
ON/OFF
Figure 3
starts illuminating continuously. At the same time, the
display of the Main Remote Control is on continuously.
8. Change the DIP Switch #4 setting back to the "OFF"
position. DO NOT alter any other DIP Switch. The LED
on the PCB will stop illuminating. At the same time, the
display of the Main Remote Control will turn off.
9. Turn on the water heater at the remote control by pressing
the power button, see Figure 3.
Figure 2
PRIORITY
°F
POWER
ON/OFF
Figure 4