Memory Chips - Intertek ACVC96 Service Instructions Manual

SERVICING
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GOODMAN PT# PCBKF104
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 preheat cycle. Measure voltage be-
tween Pin 1 and Pin 5 (on the 5-pin connector) located
on ignition control. No voltage, check low stage and high
stage pressure switches or replace the ignition control
board.
5. After the ignitor warmup time, begin checking for 24 volts
to the gas valve. Voltage will be present for seven sec-
onds only if proof of flame has been established.
6. If proof of flame was established voltage will be provided
to the air circulation blower following the heat on delay
period.
a. BEFORE replacing the ECM motor assembly or the
end bell, first check the motor with a Goodman #UTT-
01 UltraCheck-EZ
runs with the diagnostic tool, the motor is good. To
check the end bell, see the previous variable speed
testing section of this manual before replacing the end
bell.
74
DE
R C G W1 W 2 Y1 Y2 O
HUM
TM diaganostic tool . If the motor
b. The two-stage variable speed furnaces should have
120 Volts at the motor at all times, even without a call
for cooling or heating. These motors receive their op-
erational signals through the 4-pin wiring harness,
connected between the motor and integrated control
board. NOTE: For complete troubleshooting informa-
tion on units using the ECM blower motors, refer to
the servicing section - Checking Air Circulator Blow-
ers (S-16B) in this service manual.
S-313A MEMORY CHIPS
Memory chips are a service only item and are not sent out
with new equipment. They are used only in the rare occur-
rence where communicating equipment shared data needs
to be restored.
Memory chips should not be routinely installed at the time
of installation. A memory chip is not required when an indi-
vidual control board or motor is replaced.
A memory chip is only required when all communicating
components have been replaced with service parts contain-
ing no shared data. If either an existing control board or
ECM motor needed to be replaced, the service part would
upload the necessary data from the remaining communicat-
ing component. In a fully communicating system, this would
include the communicating thermostat and communicating
outdoor unit control board as the necessary data is stored
in all communicating devices.
A furnace void of shared data will not function in a legacy or
a fully communicating installation. The furnace display would
show "d0" indicating that there is no shared data in the fur-
nace control board. If it is ever necessary to use a memory
chip, the specific memory chip for your furnace number must
be used.
To use a memory chip;
1. Power down all HVAC equipment in the system.
2. As when handling any electronic components; discharge
any static electricity you may be carrying by touching
grounded metal.