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installation
7 ELECTRICAL
FOR SAFETY BEFORE SERVICING:
If the STC Series unit is equipped with an electrical power disconnect
switch make sure the switch is in the "OFF" position before working
on the unit, preferably locked out in this position.
7.1 FIELD WIRING
Field wiring should comply with NEC and local codes. The power
supply voltage, phase and frequency must match what is shown
on the unit data plate. Wire each motor so that the fan rotation is
counter-clockwise.
Table 1 — Motor Electrical Data
Number
Fan RPM
hp
of Fans
1140
1/3
1140
1/2
850
1/2
1140
3/4
850
3/4
One
1140
1
850
1
1140
1-1/2
1140
1-1/2
850
1-1/2
1140
2
1140
1/3
1140
1/2
850
1/2
1140
3/4
850
3/4
Two
1140
1
850
1
1140
1-1/2
1140
1-1/2
850
1-1/2
1140
2
1140
1/3
1140
1/2
850
1/2
1140
3/4
850
3/4
Three
1140
1
850
1
1140
1-1/2
1140
1-1/2
850
1-1/2
1140
2
Fan Motor Nameplate Total Full Load Amps
230/60/3
380/50/3
460/60/3
1.8
0.9
0.9
2.4
1.2
1.2
2.6
1.3
1.3
2.8
1.4
1.4
4.0
2.0
2.0
3.6
1.8
1.8
4.2
2.1
2.1
5.0
2.5
2.5
5.0
2.5
2.5
6.2
3.1
3.1
7.0
3.5
3.5
3.6
1.8
1.8
4.8
2.4
2.4
5.2
2.6
2.6
5.6
2.8
2.8
8.0
4.0
4.0
7.2
3.6
3.6
8.4
4.2
4.2
10.0
5.0
5.0
10.0
5.0
5.0
12.4
6.2
6.2
14.0
7.0
7.0
5.4
2.7
2.7
7.2
3.6
3.6
7.8
3.9
3.9
8.4
4.2
4.2
12.0
6.0
6.0
10.8
5.4
5.4
12.6
6.3
6.3
15.0
7.5
7.5
15.0
7.5
7.5
18.6
9.3
9.3
21.0
10.5
10.5
Wiring for a unit with Air or Hot Gas Defrost requires power to
the fan motors terminal block only. The fan motor terminal block is
located on the end panel at the unit end opposite the refrigerant
connection end of the unit. If the unit is supplied with Electric
Defrost, wiring will be required to the mounted terminal blocks in
the electrical enclosure for defrost heaters. See Figure 6, 7, and
8 for typical unit wiring. See wiring diagram supplied with unit for
the specific wiring of each unit. .
7.2 ELECTRICAL DATA
Number
Fan RPM
of Fans
575/60/3
-
1140
1.0
1140
1.3
850
1.2
1140
1.6
850
1.5
Four
1140
1.8
850
2.0
1140
2.0
1140
2.5
850
2.5
1140
1140
2.0
1140
2.6
850
2.4
1140
3.2
850
3.0
Five
1140
3.6
850
4.0
1140
4.0
1140
5.0
850
5.0
1140
1140
3.0
1140
3.9
850
3.6
1140
4.8
850
4.5
Six
1140
5.4
850
6.0
1140
6.0
1140
7.5
850
7.5
1140
Fan Motor Nameplate Total Full Load Amps
hp
230/60/3
380/50/3
1/3
7.2
3.6
1/2
9.6
4.8
1/2
10.4
5.2
3/4
11.2
5.6
3/4
16.0
8.0
1
14.4
7.2
1
16.8
8.4
1-1/2
20.0
10.0
1-1/2
20.0
10.0
1-1/2
24.8
12.4
2
28.0
14.0
1/3
9.0
4.5
1/2
12.0
6.0
1/2
13.0
6.5
3/4
14.0
7.0
3/4
20.0
10.0
1
18.0
9.0
1
21.0
10.5
1-1/2
25.0
12.5
1-1/2
25.0
12.5
1-1/2
31.0
15.5
2
35.0
17.5
1/3
10.8
5.4
1/2
14.4
7.2
1/2
15.6
7.8
3/4
16.8
8.4
3/4
24.0
12.0
1
21.6
10.8
1
25.2
12.6
1-1/2
30.0
15.0
1-1/2
30.0
15.0
1-1/2
37.2
18.6
2
42.0
21.0
460/60/3
575/60/3
3.6
-
4.8
4.0
5.2
5.2
5.6
4.8
8.0
6.4
7.2
6.0
8.4
7.2
10.0
8.0
10.0
8.0
12.4
10.0
14.0
10.0
4.5
6.0
5.0
6.5
6.5
7.0
6.0
10.0
8.0
9.0
7.5
10.5
9.0
12.5
10.0
12.5
10.0
15.5
12.5
17.5
12.5
5.4
7.2
6.0
7.8
7.8
8.4
7.2
12.0
9.6
10.8
9.0
12.6
10.8
15.0
12.0
15.0
12.0
18.6
15.0
21.0
15.0
9
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