Johnson Controls MAHP18B21S - Figure 33. Thermistor Connectors

PMGB0406B rev.1
59
NOTE:
When ¿ tting the pipe thermistors, remember that they must be secured correctly by the thermistor holder,
ensuring the perfect contact between the pipe and thermistor. Cover it completely with insulation, butyl
sheet and pipe insulation to protect it from the effect of the surrounding ambient temperature. Replace them
if damaged during maintenance work.
(1) Remove both upper and lower front panels of the air handler to access the blower and coil
compartment.
(2) Remove the control box cover with the six screws.
(3) Pass the two connector side of thermistor cable through the connecting hole and connect the
thermistor connectors to the corresponding connectors on the PCB.
(4) Route the thermistor probe end inside the air handler by passing through the connecting hole on the
right side of the top panel of the air handler.
(5) Attach the thermistor probes to position indicated in the ¿ gure below inside the air handler.
When attaching pipe thermistors use the thermistor holder. Then apply the pipe insulation with plastic
bands to make sure that there is no clearance between the thermistors and pipe insulation.
Use this hole for routing
Use this hole for routing
the thermistors inside the
the thermistors inside the
air handler
air handler
Connector for Air Inlet Thermistor
Connector for Air Inlet Thermistor
(THM1,Blue)
(THM1,Blue)
Connector for Air Outlet Thermistor
Connector for Air Outlet Thermistor
(THM2,Red)
(THM2,Red)
Connector for Liquid Pipe Thermistor
Connector for Liquid Pipe Thermistor
(THM3,Black)
(THM3,Black)
Connector for Gas Pipe Thermistor
Connector for Gas Pipe Thermistor
(THM5,Yellow)
(THM5,Yellow)
X2
X2
YX2
YX2
X3
X3
YX5
YX5
YX4
YX4
YX3
YX3
P*****
P*****
CN402
CN402
CN403
CN403
CN404
CN404
CN401
CN401
X4
X4
X5
X5
R
121175 8 10921 3 64
321
4
321
32
6
541
32
6
541
4
321
21
PCN6
PCN6
PCN7
PCN7
PCN3
PCN3
PCN2
PCN2
YH2
YH2
C4
C4
R3
R3
PC4
PC4
Z2
Z2
DSA
DSA
SSR1
SSR1
R8
R8
R6
R6
R2
R2
R4
R4
PC2
PC2
PC3
PC3
C35
C35
ZD2
ZD2
HA
HA
CN8
CN8
CN7
CN7
C3
C3
C8
C8
C2
C2
REG3
REG3
LED4
LED4
LED3
LED3
L2
L2
DM2
N
THM5
THM5
THM4
THM4
THM3
THM3
THM2
THM2
CN2
CN2
CN4
CN4
CN3
CN3
TP
TP
L4
L4
L3
L3
EF4
EF4
Z3
Z3
Z4
Z4
FUNC
FUNC
ZD1
ZD1
C11
C11
HIC1
HIC1
DM1
DM1
CN11
CN11
CN17
CN17
LED1
LED1
C12
C12
CN1
D12
D12
D11
D11
D10
D10
DSW7
DSW7
DSW3
DSW3
DSW4
DSW4
DSW5
DSW5
DSW6
DSW6
RSW1
RSW1
RSW2
RSW2
DSW8
DSW8
R1
R1
THM1
THM1
L1
L1
PCN1
PCN1
EFR1
EFR1
EFS1
EFS1
C1
C1
Z1
Z1
CN1925
CN1925
CN14
CN14
PC1
PC1
C15
C15
EF1
EF1
R12
R12
R13
R13
REG1
REG1
REG2
REG2
0
1
9
8
7
6
5
4
3
2
5
4
3
2
1
0
9
8
7
6
1
Float Sw.
Float Sw.
2 3 4 5 6 7 8 9
11
1110 12
EXP.VALVE
EXP.VALVE
1 2 3 4 - 6
CONTROL
CONTROL
1 2 A B 1 2
L1
L1 L2
1 2 3 4
PS
PS
Drain Pump
Drain Pump
L1
L1 L2
4321
Figure 33. Thermistor Connectors
(Ins)DX-Kit4e-rev1.indd59
(Ins)DX-Kit4e-rev1.indd59
2016/11/2515:32:59
2016/11/2515:32:59