IM 439 / Page 13 of 24
Figure 15. Typical MicroTech unit — dual compressor
LEGEND
Component
Wire Connector
Thermistor
Heater
Crankcase Heater
Optional Wiring
V1 & V2
Expansion Valve
R1, R2 & R3
Relay
M2 & M3
Compressor Contactor
T1 & T2
Transformer
RV1 & RV2
Reversing Valve Solenoid
LP1 & LP2
Low pressure Switch
HP1 & HP2
High Pressure Switch
LT1 & LT2
Low Temperature Switch
M1
Fan Starter
TB
Terminal Block Connection
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
Gnd Lug
L1
PB1
1
1
2
3
2
L1
L2
L3
T1
BK
RD
YE
Fan
Mtr.
GR/Y
E
M1
T2
T3
3
7
16
T1
T2
T3
Compr.
Mtr.
1
T1
T2
T3
Compr.
Mtr.
2
8
12
17
9
13
18
12
13
L1
L2
L3
T1
T2
T3
M2
4
M3
4
5
14
6
15
BK
BK/RD 460V
OR 230V
RD 208V
BK 575V
VT 400V
BK
YE
BL
93
V1
WH
WH
CKT1
CKT 2
91
90
Circuit
Breaker
96
95
WH
94
V2
45
44
81
60
C
C
BR
84
85
83
82
RV2
80
79
LP2
LT
2 3
2
J10
J11
J4
Auxiliary
Module
MicroTech
Controller
J8
77
78
1 2 3 4
1 2 3 4
1
J2
J1
2
1
46
Disch
Air
Wa
te
r
Out
44
42
43
Condensate
Lo T
emp
SRC
Lo T
emp
SIG
Lo Press SIG
Lo Press SRC
Hi Press SIG
RV
Com
RV
Out
Comp Com
Comp Out
Fan Com
Fan Out
24V
AC
24V Gnd
Discharge Air
Com
Remote D1 SRC
Remote D1 SIG
Spare Relay NC
Spare Relay NO
Spare Relay Com
RM Sensor LED
T
enant Override
RM Sensor In
Lon T
a
lk
RM Sensor Com
24V
AC Com
Lon T
a
lk
Discharge Air
W
ater
W
ater Out Com
Wa
ter Out In
Aux Module DC Com
Aux Module DC +
Aux Module SEL
2
Aux Module SEL
1
Aux Module CLK
Aux Module RCV
Aux Module XMT
41
40
39
BR
38
37
36
35
RV1
M1
BR
59
C2
4
C
C
HP1
M2
Condensate
Overflow
34
32
76
LP1
LT
1
32
34
30
31
33
45
47
53
54
56
55
48
49
50
51
52
1
2
3
4
5
6
7
8
9
10
11
11
12
13
14
J4
J1
J2
7
8
9
10
5
6
1
69
E
L
U
P
C
Te
rminal Board #2
70
71
72
73
1 2 3 4 5
6 7 8 9 10 1112
67
68
66
65
64
63
62
1 2 3 4 5 6 7 8 9
J5
J6
2
3
4
2 3 4 5 6 7
4 3 2 1
4 3 2 1
81
BR
M3
HP2
T1 (50VA)
19
20
21
14
15
T1
T2
T3
L1
L2
L3
L2 L3
T1
T2 T3
Heater
(Ext. Rng. Only)
Heater
(Ext. Rng. Only)
Terminal Board #1
(optional)
