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
123
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
9695
WH
94
V2
45
44
81
60
C
C
BR
84
85
83
82
RV2
80
79
LP2
LT2
3
2
J10J11J4
Auxiliary
Module
MicroTech
Controller
J8
77
78
1234 1234
1
J2 J1
21
46
Disch
Air
Water
Out
44
42
43
Condensate
Lo Temp SRC
Lo Temp SIG
Lo Press SIG
Lo Press SRC
Hi Press SIG
RV Com
RV Out
Comp Com
Comp Out
Fan Com
Fan Out
24VAC
24V Gnd
Discharge Air Com
Remote D1 SRC
Remote D1 SIG
Spare Relay NC
Spare Relay NO
Spare Relay Com
RM Sensor LED
Tenant Override
RM Sensor In
Lon Talk
RM Sensor Com
24VAC Com
Lon Talk
Discharge Air Water
Water Out Com
Water 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
LT1
32
34
30
31
33
45
47
53
54
56
55
48
49
50
51
52
123456789101111121314
J4
J1 J2
78910 561
69
E
L
U
P
C
Terminal Board #2
70
71
72
73
12345 6789101112
67
68
66
65
64
63
62
12345678
9
J5 J6
234
234 567
4321 4321
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)
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