Paloma PH2-20R DVSN, Engineering Handbook

Page: 129 / 172

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High Altitude DIP Switch Adjustment For High Altitude
Installation Above 3,280 Feet (1,000 M):
WARNING: Improper adjustment, alternation, service or maintenance can cause property
damage, personal injury, or death.
When the water heater is installed above 3,280 feet (1,000m) or when the Burner Control Assembly (PCB) was
replaced, the adjustment of DIP switch is required for high altitude installation.
Without adjusting the DIP switch, the water heater may not function properly.
NOTICE: If the water heater is installed less than 3,280 feet (1,000m), no action is required.
H
ow to adjust the DIP switch on the PCB for high altitude installation:
(1) Check the altitude (above sea level) where the water heater is installed.
(2) If the altitude is more than 3,280 feet (1,000m), the adjustment of DIP switch is required.
(3) Turn off the gas shutoff valve and water shutoff valve.
(4) Remove the front cover.
(5) Find the two DIP switches located at the top right hand side of the PCB. The switch labeled “DIP 2” is the bottom
switch.
(6) Change the DIP switch #3 setting of DIP 2 to “ON” position if the water heater is installed above 3,280 feet
(1,000m) below 6,560 feet (2,000m). See the diagram below. DO NOT alter any other DIP Switch.
(7) Change the DIP switch #4 setting of DIP 2 to “ON” position if the water heater is installed above 6,560 feet
(2,000m) below 9,840 feet (3,000m). See the diagram below. DO NOT alter any other DIP Switch.
NOTICE: Manifold pressure will be reduced by this adjustment.
(8) Attach the unit’s front cover.
(9) Turn on the gas shutoff valve and water shutoff valve.
(10) Check and ensure safe operation and performance of the water heater.
ON
1 2 3 4
ON
OFF
ON
1 2 3 4
ON
OFF
1 2 3 4
1 2 3 4
DIP2
DIP1
MIN MAX
ADJ
LED
DIP 1
DIP 2
Adjusting
Button (SW3)
Program
Chip
Maximum
Button (SW2)
Minimum
Button (SW1)
LED
Dip switch adjustment
3,280 feet (1,000m)
thru
6,560 feet (2,000m)
ON
1
2 3 4
As set from factory
ON
1 2 3
4
ON
1 2 3 4
Dip switch adjustment
6,560 feet (2,000m)
thru
9,840 feet (3,000m)