Amana GCIA045A30, Инструкция по эксплуатации

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82
Rev. 2
SERVICING
The ignition control module is a combination electronic and
electromechanical device and is not field repairable. Com-
plete unit must be replaced.
The WR50A50, WR50A51or the HSI 1-1A, HSI-2 ignition
controls, control all furnace operations including blower op-
eration in air conditioning. Blower time delays are controlled
by the ignition control, see
AIR CIRCULATION FAN TIM-
ING section in the PRODUCT DESIGN section of this manual
for blower delay information.
WARNING
LINE VOLTAGE NOW PRESENT.
These tests must be completed within a given time frame
due to the operation of the ignition control. Refer to
SE-
QUENCE OF OPERATION section of this manual for corre-
sponding timing charts.
The ignition control is capable of diagnosing many furnace
failures to speed troubleshooting. A flashing red or green
diagnostic indicator light on the control flashes a code for
any discovered failures.
When the control is powered up normally the light will flash
once for about one second. This can be used to test for 120
volts and 24 volts to the control since both must be present
for the light to flash. If this step fails, check for 120 volts to
the control and check the transformer and its associated
wiring. If this step is successful give the control a call for
heat and wait five (5) seconds or until the furnace goes into
lockout. If the control detects a failure it will now be shown
on the diagnostic indicator light. Refer to the
ABNORMAL
OPERATION section in the SEQUENCE OF OPERATION
section of this manual for more detail on failure codes.
The indicator light may be viewed by looking through the
sight glass in the blower compartment door. If the blower
compartment door is removed, failure to hold the door switch
closed while removing the blower compartment door will re-
sult in the loss of the stored failure code. In most cases
recycling the ignition control will result in the same failure
code originally displayed.
1. Check for 120 volts from Line 1 (BK6 wire) to line 2 neu-
tral (WH-33 wire) at the ignition control. No voltage - check
the door switch connections and wire harness for conti-
nuity.
2. Check for 24 volts from W to C at the thermostat con-
nections on the ignition control. No voltage - check trans-
former, room thermostat, and wiring.
3. Check for 120 volts to the induced draft blower by mea-
suring voltage between IND (VT-55) and neutral for the
50A50, HSI 1-1A and HSI-2 ignition controls, and be-
tween IND (BK) and RED (RD) for the 50A51 ignition
control. No voltage - replace ignition control.
4. If voltage is present in Steps 1 through 3 and the in-
duced draft blower is operating, check for 120 volts to
the ignitor during the 17 second preheat cycle. Measure
voltage between terminals IGN (RD-22) and neutral. No
voltage - check pressure switch.
5. Seventeen seconds after a call for heat begin checking
for 24 volts to the gas valve. Voltage will be present for
seven seconds only if proof of flame has been estab-
lished. Measure voltage from Pin 9 MV terminal (GY-47
wire) to Pin 12 MV terminal (BR-21) on the ignition con-
trol 12 Pin connector for the 50A50, HSI 1-1A or HSI-2
ignition controls, and from Pin 7 MV terminal (GY-47) to
Pin 8 MV terminal (BR-21) on the ignition control 12 Pin
connector for the 50A51 ignition control. No voltage -
replace ignition control.
6. If proof of flame was established 120 volts will be pro-
vided to the air circulation blower 54 seconds after a call
for heat. Check for 120 volts from the CIR terminal (WH)
wire to the heat terminal on the ignition control. No volt-
age - replace ignition control.
Note: Accessory Electronic Air Cleaners and Humidifiers
powered through the ignition control accessory terminals,
under some circumstances can create interference with the
ignition control causing intermittent lockouts. If the source
of the lockouts cannot be otherwise determined, it is recom-
mended that these accessories be disconnected from the
ignition control and powered through alternate means.
S-13A CHECKING WR50A52 INTEGRATED IGNI-
TION CONTROL MODULE (RADIANT
SENSE)
Note: Failure to earth ground the furnace, reversing the neu-
tral and hot wire connection to the line (polarity), or a high
resistance connection in the neutral line may cause the
control to lockout due to failure to sense flame.
CAUTION
To avoid the risk of electrical shock, wiring to the unit
must be properly polarized and grounded. Disconnect
power before performing service listed below.
The ground wire must run from the furnace all the way back
to the electrical panel. Proper grounding can be confirmed
by disconnecting the electrical power and measuring resis-
tance between the neutral (white) connection and the burner
closest to the flame sensor. Resistance should be less than
10 ohms.
The ignition control module is a combination electronic and
electromechanical device and is not field repairable. Com-
plete unit must be replaced.
The WR50A52 ignition control, controls all furnace opera-
tions including blower operation in air conditioning. Blower
time delays are controlled by the ignition control and are
nonadjustable, see the specification section for blower de-
lay information.