Service Manual
SYSTEM OPERATION
74
L
INE VOLTAGE NOW PRESENT
WARNING
3. Turn ON the gas and electrical power supply and oper-
ate the furnace.
4. White-Rodgers 36J54 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” con-
tacts 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 on page 86.
f. Remove regulator cover screw from the low (LO) out-
let pressure regulator adjust tower and turn screw
clockwise to increase pressure or counterclockwise
to decrease pressure. Replace regulator cover screw.
g. Close thermostat “R” and “W2” contacts to provide a
call for high stage heat.
h. Remove regulator cover screw from the high (HI) out-
let pressure 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 sys-
tem.
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).
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High Fire Regulator
Adjust
Regulator
Vent
Measuring Manifold Gas Pressure
(36J54 Valve)
WARNING
HIGH
VOLTAGE
D
ISCONNECT
ALL
ELECTRICAL POWER AND SHUT OFF GAS SUPPLY
BEFORE SERVICING OR INSTALLING.
GasRateRangeNominal
High Stage 3.2 to 3.8" w.c. 3.5" w.c.
Low Stage 1.6 to 2.2" w.c. 1.9" w.c.
Manifold Gas Pressure
Natural Gas
WARNING
HIGH
VOLTAGE
D
ISCONNECT
ALL
ELECTRICAL POWER AND SHUT OFF GAS
SUPPLY BEFORE SERVICING OR INSTALLING THIS UNIT.
MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TO
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
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 Silicon Nitride Igniter - Amana® Brand and
Goodman® Brand A/GMVC96 and A/GCVC96 furnaces use
a 120V silicon nitride igniter for ignition. The normal operat-
ing temperature is approximately 2156°F - 2678°F.
DISCONNECT ALL POWER BEFORE SERVICING.
WARNING
1. Remove burner compartment door to gain access to the
ignitor.
2. Ignitor cool - approximately 70 - 77°F.
3. Disconnect the ignitor from the Ignition Control.
4. Using an ohmmeter measure the resistance of the igni-
tor:
120 Volt Silicon Nitride : 120V Nitride Igniter should read
between 37 to 68 ohms.
5. Reconnect ignitor.