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SYSTEM OPERATION
12
L2
INDUCER
LOW HIGH
L1
OD F
LOW HIGH
T1
Q3
K4
K3
K5
K6
T2
K7
FS
U1
U2
U6
U7
U4
U5
U3
P2
K2
K1
ECON
STAGE
DELAY
C9
SPEED UP
SW1
FAULT
RECALL
BLOWER
OFF
DELAY
F1
R C W1W2 G
Y2
90
120
150
180
10MIN
5 MIN
NONE
PARK
1
2
3
4
5
Y1
PCBAG127 Control Board
Description
The ignition control is designed for use in gas heating/
electric cooling package equipment (rooftop applications)
and operates with a two stage heat and two stage cooling
system. It is a direct spark ignition system that uses a
22,000 volt spark to ignite the burners. A flame sensor is
used to monitor the flame.
The board has the option of using a single or two stage
thermostat. The board also controls the indoor blower and
has an adjustable heat fan off delay.
There is also a fault recall button for recalling the last 5
fault codes. To recall the fault codes, depress the fault
recall button for at least 2 seconds but not more than 4
seconds. To clear the fault code memory, depress the fault
recall button for at least 5 seconds.
The following tables list the functions for the connectors
and terminals, the timings, and the fault codes for the
PCBAG127 control board.
WARNING
High Voltage!
Disconnect all power before servicing or
installing. Multiple power sources may be present.
Failure to do so may cause property damage,
personal injury or death.