Service Guide

SERVICING
37

 

S

R R  S  S
S R SR R S S 

 R SRS   RS

R 
 S  S RR  RS JR R 
5. Disconnect manometer after turning o󰀨 gas at manual
shuto󰀨 valve. Reinstall plug before turning on gas to
furnace.
6. Turn OFF any unnecessary gas appliances started in step
3.
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 operation.



 R R R R Q  
S  RSSR S  S S   
R 

 R JSS S   
JS  S  RSSR RR

 Use apapter kit #0151K00000S to measure gas
pressure on White-Rodgers 36J22 gas valves.
Only small variations in gas pressure should be made by
adjusting the gas valve pressure regulator. The manifold
pressure must be measured with the burners operating. To
measure and adjust the manifold pressure, use the following
procedure.

 
S  R R  S  S S


R SR R S
1. After turning o󰀨 gas to furnace at the manual gas shuto󰀨
valve external to the furnace, remove burner compartment
door to gain access to the gas valve.
2. Connect a calibrated water manometer (or appropriate
gas pressure gauge) at the gas valve outlet pressure
tap. Refer to Measuring Gas Pressure: Single Stage
Valves gure for single stage valve outlet pressure tap
connections.

   RS

3. Turn ON the gas and electrical power supply and operate
the furnace.
4. Measure gas manifold pressure with burners ring. Adjust
manifold pressure using the table below.
3.5" w.c.
10.0" w.c.



The nal manifold pressure must not vary more than ± 0.3
“ w.c. from the above specied pressures. Any necessary
major changes in gas ow rate should be made by changing
the size of the burner orice.
5. White-Rodgers 36G22 Valves:
a. Back outlet pressure test screw (inlet/outlet pressure
boss) out one turn (counterclockwise, not more than
one turn).
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 ring.
Adjust manifold pressure using the Manifold Gas
Pressure table shown below.
f. Remove regulator cover screw from the outlet pressure
regulator adjust tower and turn screw clockwise to
increase pressure or counterclockwise to decrease
pressure. Replace regulator cover screw.
i. Turn o󰀨 all electrical power and gas supply to the
system.
j. Remove the manometer hose from the hose barb tting
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 tting into the outlet pressure tap.
b. Attach a hose and manometer to the outlet pressure
barb tting.
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 ring.
Adjust manifold pressure using the Manifold Gas
Pressure table shown below.
f. Remove regulator cover screw from the outlet pressure
regulator adjust tower and turn screw clockwise to
increase pressure or counterclockwise to decrease
pressure. Replace regulator cover screw.
i. Turn o󰀨 all electrical power and gas supply to the
system.
j. Remove the manometer hose from the hose barb tting
or outlet pressure boss.
k. Remove the 1/8” NPT hose barb tting from the outlet
pressure tap. Replace the outlet pressure boss plug
and seal with a high quality thread sealer.