Checking Hot Surface Ignitor - Intertek ACVC96 Service Instructions Manual

SERVICING
WARNING
L
INE VOLTAGE NOW PRESENT
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).
Measuring Manifold Gas Pressure
(36J54 Valve)
High Fire Regulator
Adjust Regulator
Vent
HIGH VOLTAGE
D ALL
ISCONNECT ELECTRICAL POWER AND SHUT OFF GAS SUPPLY
BEFORE SERVICING OR INSTALLING.
Manifold Gas Pressure
Gas Rate
High Stage
Natural Gas
Low Stage
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.
HIGH VOLTAGE
D ALL
ISCONNECT ELECTRICAL POWER AND SHUT OFF GAS SUPPLY
BEFORE SERVICING OR INSTALLING.
Manifold Gas Pressure
Gas Rate
High Stage
Propane Gas
Low Stage
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.
WARNING
D ALL
ISCONNECT POWER BEFORE SERVICING.
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.
WARNING
Range Nominal
3.2 to 3.8" w.c. 3.5" w.c.
1.6 to 2.2" w.c. 1.9" w.c.
WARNING
F
AILURE TO
WARNING
Range Nominal
9.7 to 10.3" w.c. 10.0" w.c.
5.7 to 6.3" w.c. 6.0" w.c.
71