SERVICING
55
b. Attach a hose and manometer to the outlet pressure
outlet pressure boss.
c. Turn ON the gas supply.
d. Turn on power and close thermostat “R” and “W1”
contacts to provide a call for low stage heat.
e. Measure the gas manifold pressure with burners fir-
ing. Adjust manifold pressure using the
Manifold Gas
Pressure
table shown below.
f. Remove regulator cover screw from the outlet pres-
sure regulator adjust tower and turn screw clockwise
to increase pressure or counterclockwise to decrease
pressure. Replace regulator cover screw.
i. Turn off all electrical power and gas supply to the
system.
j. Remove the manometer hose from the hose barb fit-
ting or outlet pressure boss.
k. Turn outlet pressure test screw in to seal pressure
port (clockwise, 7 in-lb minimum).
6. Honeywell VR8215 Valve
a. Remove the outlet pressure boss plug. Install an 1/
8" NPT hose barb fitting into the outlet pressure tap.
b. Attach a hose and manometer to the outlet pressure
barb fitting.
c. Turn ON the gas supply.
d. Turn on power and close thermostat “R” and “W1”
contacts to provide a call for low stage heat.
e. Measure the gas manifold pressure with burners fir-
ing. Adjust manifold pressure using the
Manifold Gas
Pressure
table shown below.
f. Remove regulator cover screw from the outlet pres-
sure regulator adjust tower and turn screw clockwise
to increase pressure or counterclockwise to decrease
pressure. Replace regulator cover screw.
i. Turn off all electrical power and gas supply to the
system.
j. Remove the manometer hose from the hose barb fit-
ting or outlet pressure boss.
k. Remove the 1/8" NPT hose barb fitting from the out-
let pressure tap. Replace the outlet pressure boss
plug and seal with a high quality thread sealer.
WARNING
HIGH
VOLTAGE
D
ISCONNECT
ALL
ELECTRICAL POWER AND SHUT OFF GAS
SUPPLY BEFORE SERVICING OR INSTALLING THIS UNIT.
M
ULTIPLE POWER SOURCES MAY BE PRESENT.
F
AILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
7. Turn on gas to furnace and check for leaks. If leaks are
found, repair and then reinstall burner compartment
door.
8. Turn on electrical power and verify proper unit opera-
tion.
Pressure Regulator
Adjustment
(Under Cap Screw)
Gas Valve
On/Off
Selector
Switch
INLET
OUTLET
Inlet Pressure
Tap
Outlet Pressure
Tap
White-Rodgers Model 36J22 (Single-Stage)
Gas Valve On/Off
Selector Switch
Inlet
Pressure
Tap
Pressure Regulator
(under cap screw)
Outlet
Pressure
Tap
Honeywell Model VR8215
WARNING
HIGH
VOLTAGE
D
ISCONNECT
ALL
ELECTRICAL POWER AND SHUT OFF GAS SUPPLY
BEFORE SERVICING OR INSTALLING.
Gas
Rate
Range
Nominal
High Stage 9.7 to 10.3" w.c. 10.0" w.c.
Low Stage
5.7 to 6.3" w.c.
6.0" w.c.
Manifold Gas Pressure
Propane Gas
S-308 CHECKING HOT SURFACE IGNITOR
120V Mini Igniter Single Stage -
furnaces use a 120V
carbide mini igniter for ignition. The normal operating tem-
perature is approximately 2550°F - 2876°F. At room tem-
perature a good igniter will have an ohm reading range of 50
- 300.
D
ISCONNECT
ALL
POWER BEFORE SERVICING.
WARNING