SERVICING
45
WARNING
HIGH VOLTAGE
DISCONNECT ALL POWER BEFORE SERVICING OR
INSTALLING THIS UNIT. MULTIPLE POWER SOURC-
ES MAY BE PRESENT. FAILURE TO DO SO MAY
CAUSE PROPERTY DAMAGE, PERSONAL INJURY
OR DEATH.
X3A
X15A
X5A
SEG2
SEG1
X12A
X13A
X8A
INDOOR UNIT CONTROL BOARD
THERMISTOR
Micro
Processor
PRESSURESENSOR
EEV
COIL
FUSE
TB4
TB1
TB5
TB2
C
R
2
1
S1 S2 S3 S4
Heater Kit
Output
ECM Motor
ON
OFF
DS1
DS2
DS3
D
4S
D
S
5
F
U
ES
1F
U
X
1
A
SHARE DATA
S5 S6 S7 S8
S9 S10 S11 S12
S13 S14 S15 S16
S17 S18 S19 S20
S21 S22
F
2
U
T
B
6
BT
8
T
B
7
T
1B
0
T
B
3
D
S
6
O
N
O
F
F
7seg
7seg
X
2
A
X
A7
C
R
2
1
AUXALARM
C
R
2
1
ACC-OUT
ACC-IN
(Accessory)
(Accessory)
SB
2
B
S
1
F
UA
L
T
ER
C
A
L
L
L
E
A
R
N
RX LED
CPULED
STATUSLED
The control is equipped with two Auxiliary Alarm terminals,
labeled TB4 and TB5, which are typically utilized in series
with a condensate switch but could also be used with com-
patible CO
TB5
SWITCH
ALARM
TB4
The auxiliary alarm switch must be normally closed and open
when the alarm occurs. For example, a normally closed con-
densate switch will open when the base pan’s water level
reaches a particular level. The control will respond by turning
If the switch is later detected closed for 30 seconds, normal
operation resumes and the error message is removed. The
switch is closed as part of the default factory setting. The
error will be maintained in the equipment's fault history.
This air handler is equipped with a variable speed circulator
blower. This blower provides several automatically-adjusted
NOTE: Upon start up in communicating mode the circuit
-
clear the error code.
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