GC9C80 Installation Manual
23
• On a call for heat, the thermostat contacts close & the
• The control board microcomputer runs its self-check
routine.
•
Pin 8 of the 12 Pin connector).
•
• The control module performs a gas valve circuitry check
to verify gas valve relay state and presence of voltage
at the valve.
• The system will energize the Induced draft blower.
•
• After the completion of pre-purge, the control will
energize the igniter.
• After completion of the ignitor warm-up period:
• The gas valve is energized.
•
• After 30 seconds the indoor blower is energized on
heating speed.
• When using a single-stage heating thermostat, the
furnace will transition to 2nd stage gas heat by either a
made by the installer.
• The inducer motor is enabled at high speed.
•
• The 2nd stage gas heat speed of the indoor blower is
energized
•
• The gas valve is de-energized.
• The inducer remains energized for the post purge period
(15 seconds).
•
(90 seconds by default, adjustable from 30 – 180
seconds).
•
terminal.
• The inducer motor is enabled at high speed.
•
• The 2nd stage gas heat speed of the indoor blower is
energized.
To change the main blower speed in HEATING mode, follow
the following steps:
1.
(for single-stage HEATING) or “gA2” (for two-stage
number).
2. The control will rotate available speed number every
time left / right switches are pressed. The table below
shows the available speeds for low & high heat mode.
3. Press the center switch to save the selection.
available heating speeds
THERMOSTATCALL AVAILABLESPEEDS
W/W1
F01(DEFAULT)
F03
F04
W2
F02(DEFAULT)
F04
F05
To change the main blower speed in circulation mode, follow
the following steps:
1.
2. The control will rotate available speed number every
time left/right switches are pressed. All 9 speeds are
available for circulation.
3. When the center switch is pressed, the current displayed
speed will be selected, and control will immediately apply
that speed setting.
THERMOSTAT
CALL
AVAILABLE
SPEEDS
G
F01
F02
F03(DEFAULT)
F04
F05
F06
F07
F08
F09