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SERVICING
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 firing.
Adjust manifold pressure.
f. Use the modulation adjustment screw on the gas valve
and turn clockwise one click using a pocket screwdriver
to increase gas flow. Allow the gas flow to adjust ap-
proximately 15 seconds before moving the adjustment
screw again. Turn the modulation adjustment screw
counterclockwise with a pocket screwdriver to decrease
gas flow if this adjustment is needed. Allow the gas flow
to adjust approximately 15 seconds before moving the
adjustment screw again. These changes should only be
done to fine tune the gas flow.
g. Turn off all electrical power and gas supply to the system.
h. Remove the manometer hose and adapter from gas
valve.
i. Install 1/8" N.P.T. plug using 5/16" Allen wrench.
j. Turn on electrical and gas supply to the furnace.
Measuring Manifold Gas Pressure
HIGH VOLTAGE
D
ALL
ISCONNECT
ELECTRICAL POWER AND SHUT OFF GAS SUPPLY
BEFORE SERVICING OR INSTALLING.
HIGH VOLTAGE
D
ALL
ISCONNECT
ELECTRICAL POWER AND SHUT OFF GAS
SUPPLY BEFORE SERVICING OR INSTALLING THIS UNIT.
M
ULTIPLE POWER SOURCES MAY BE PRESENT.
DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
(36J27 Valve)
WARNING
WARNING
F
AILURE TO
HIGH VOLTAGE
D
ALL
ISCONNECT
ELECTRICAL POWER AND SHUT OFF GAS SUPPLY
BEFORE SERVICING OR INSTALLING.
Manifold Gas Pressure
Gas Type Gas Input
50%
Natural
100%
50%
Propane
100%
CHECKING HOT SURFACE IGNITER
120V Silicon Nitride Igniter - Amana® Brand and Good-
man® Brand A/GMVM97 and A/GCVM97 furnaces use a
120V silicon nitride igniter for ignition. The normal operating
temperature is approximately 2156°F - 2678°F.
D
ALL
ISCONNECT
POWER BEFORE SERVICING.
1. Remove burner compartment door to gain access to the
igniter.
2. Igniter cool - approximately 70 - 77°F.
3. Disconnect the igniter from the Ignition Control.
4. Using an ohmmeter measure the resistance of the igniter:
120 Volt Silicon Nitride: 120V Nitride Igniter should read
between 37 to 68 ohms.
5. Reconnect igniter.
L
INE VOLTAGE NOW PRESENT
6. Place unit in heating cycle, measure current draw of igniter
during preheat cycle.
The steady state current at 120V is 0.37 to 0.68 amps.
7. After checking and/or replacing of hot surface igniter,
reinstall burner compartment door and verify proper unit
operation.
WARNING
Nominal
Range
.9" w.c.
.6"w.c. - 3.8"w.c.
3.5" w.c.
2.5" w.c.
2.2"w.c. - 10.3"w.c.
10.0" w.c.
WARNING
WARNING
65
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