SERVICING
53
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.
Amana® Brand and
Goodman® Brand A/GMVC96 and A/GCVC96 furnaces use
a 120V silicon nitride ignitor for ignition. The normal operating
temperature is approximately 2156°F - 2678°F.
CEC
ER ERE ERC.
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 ignitor:
120 Volt Silicon Nitride : 120V Nitride Igniter should read
between 37 to 68 ohms.
5. Reconnect ignitor.
E E REE
6. Place unit in heating cycle, measure current draw of ignitor
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 ignitor,
reinstall burner compartment door and verify proper unit
operation.
Flashback will also cause burning in the burner venturi, but is
caused by the burning speed being greater than the gas-air
Flashback may occur at the moment of ignition, after a burner
extinction pop.
should be made to determine which has occurred.
1. Improper gas pressure - adjust to proper pressure (See
S-307 CHECKING GAS PRESSURE)..
2. Check burner for proper alignment and/or replace burner.
The pressure control is a safety device to prevent the
combustion cycle from occurring with inadequate venting
caused by a restricted or blocked vent pipe. In addition to the
GCVC model furnaces have a “front cover pressure switch”
wired in series with the gas valve. This pressure switch keeps
the gas valve from opening in the event of condensate backing
up in the secondary heat exchanger. This could occur from
improperly connected drains or a plugged drain tube.
E
CEC
ER ERE ERC R
.
E ER RCE
E REE.
RE CE RER
E ER JR R E.
1. Remove burner compartment door to gain access to
pressure switch(es).
2. Remove wires from the pressure switch(es) electrical
terminals.
3. Remove the pressure control hose from the control and
interconnect with an inclined manometer as shown in the
followi
4. With an ohm meter connected across the pressure switch
terminals and with the inducer running, the switch should
close and the ohm meter should show a complete circuit
across the pressure switch. If the switch is not closed,
compare the negative pressure to the closing point
defective or the inducer/venting system is inadequate.
-.
OPEN TO
ATMOSPHERE
HOSE TO INDUCED
DRAFT BLOWER TAP
1/4" TEE
INDUCED DRAFT BLOWER
PRESSURE SWITCH
PRESSURE SWITCH
HOSE
INDUCED
DRAFT
BLOWER
*
*
*
* *
*
*
M
1
2
3P
C
ON
O
F
F
COIL COVER
PRESSURE SWITCH
When furnaces are installed at high altitude, the appropriate
This is required due to the natural reduction in the density of
both the gas fuel and combustion air as altitude increases.
according to the installation altitude and usage of either natural
or propane gas. Refer to the Technical Manual or product
ranges and corresponding manufacturer’s high altitude (Natural
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