13
. COMMUNICATING BOARD
Figure 14
TB5
SWITCH
ALARM
TB4
Figure 15
X3A
X15A
X5A
SEG2
SEG1
X12A
X13A
X8A
INDOOR UNIT PCB
THERMISTOR
Micro
Pr o ce sso r
PRESSURE SENSOR
EEV
COI L
FUSE
TB4
TB1
TB5
TB2
C
R
2
1
S1 S2 S 3 S4
Heater Kit
Outp ut
ECM Motor
ON
OFF
DS1
DS2
DS3
D
S
4
D
S
5
F
U
S
E
F
1
U
X
1
A
SH A RE D A T A
S5 S6 S7 S8
S9 S1 0 S 1 1 S 1 2
S1 3 S14 S1 5 S16
S1 7 S1 8 S1 9 S 2 0
S2 1 S22
F
2
U
T
B
6
T
B
8
T
B
7
T
B
1
0
T
B
3
D
S
6
O
N
O
F
F
7seg
7seg
X
2
A
X
7
A
C
R
2
1
AUX AL A RM
C
R
2
1
ACC-OUT
ACC-IN
(Accessory)
(Accesso ry)
B
S
2
B
S
1
F
A
U
L
T
R
E
C
A
L
L
L
E
A
R
N
RX L ED
CPU LED
STA TUS LED
14.1 Auxiliary Alarm Switch
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 compatible
CO
2
sensors or fire alarms.
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
off the blower motor and outdoor unit and displaying the
proper fault codes. If the switch is later detected closed for
30 seconds, normal operation resumes and the error mes-
sage is removed. (The switch is closed as part of the default
factory setting.) The error will be maintained in the
equipment’s fault history. See Figures 14 and 15 for the con-
nection location.
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