Page 12 of 24 / IM 439
Figure 14. Typical MicroTech unit — single compressor
LEGEND
Component
Wire Connector
Thermistor
Heater
Crankcase Heater
Optional Wiring
LP1
Low pressure Switch
HP1
High Pressure Switch
LT1
Low Temperature Switch
RV
Reversing Valve Solenoid
M2
Compressor Contactor
M1
Fan Starter
R1 & R2
Relay
V1
Expansion Valve
T1 & T2
Transformer
TB
Terminal Block Connection
>>
>>
> >
> >
> >
> >
PB
1
L2
L1
L3
T1
Gnd.
Lug
T2 T3
1
2
3
1
2
3
7
22
GR/Y
E
Fan
Mtr.
Compr.
Mtr.
1
T1
T2
T3
L1
M
1
M
2
L2
L3
T1
T2
T3
T1
T2
T3
L1
L2
L3
23
24
16
12
13
( Ext. Rng. Only)
17
Heater
18
7
8
12
9
13
BK
BK/RD 460V
OR 230V
RD 208V
BK 575V
VT 400V
YE
BL
52
51
1
J2
2
1
2
3
4
5
6
7
E
L
U
P
C
50
1
69
70
71
72
73
12
J2
J1
MicroTech
Controller
68
67
66
65
64
63
62
1 2 3 4 5 6 7
11
10
9
8
7
6
5
4
3
2
1
J6
2
3
4
5
7
8
9
10
11
J5
J4
Low T
e
mp.
SIG
Lo Press SIG
Condensate
Lo T
e
mp.
SRC
RV
O
u
t
Comp Com
Comp Out
Fan Com
Fan Out
24V
AC
24V Gnd
Discharge Air
Com
Discharge Air
In
W
ater Out Com
W
ater Out In
Lo Press SRC
Hi Press SRC
RV
C
o
m
Aux Module SEL
2
Aux Module SEL
1
Aux Module DC Com
Remote D1 SRC
Remote D1 SIG
Spare Relay NC
Spare Relay Com
Spare Relay NO
RM Sensor LED
T
enant Override
RM Sensor In
RM Sensor Com
Lon T
alk
Lon T
alk
24V
AC Com
Aux Module DC +
Aux Module CLK
Aux Module RCV
Aux Module XMT
1
43
42
41
C2
M1
RV
BR
59
M2
34
32
3
2
LT
1
LP1
Condensate
Overflow
C1
C
C
76
40
39
38
BR
HP1
37
36
34
33
32
35
31
30
2
3
4
5
6
7
8
9
10
11
12
13
14
6
49
53
54
55
56
48
47
46
45
44
J1
Auxiliary Module
(Optional)
Te
rminal Board #2
Circuit
Breaker
91
90
BK
92
24V
WH
WH
V1
93
T1 (50VA)
Disch.
Air
Wa
te
r
Out
Terminal Board #1
(optional)
