Daikin M Series Service And Troubleshooting page 12

SYSTEM OPERATION
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
L2
T1
K4
Q3
FS
C9
U6
5
4
U7
3
U4
2
1 U3
U5
180
SPEED UP
F1
150 NONE
120 5 MIN
SW1 90 10MIN
BLOWER STAGE
FAULT
ECON
RECALL OFF DELAY DELAY
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.
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.
L1
INDUCER
LOW
HIGH
K3 K5
T2
U2
U1
R C W1W2 G
WARNING
OD F
PARK
LOW HIGH
K6
K7
P2
K2
K1
Y1 Y2
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