Selection Procedures; Determination Of Minimum Circuit Ampacity (Mca) - Trane SCWM Series Installation, Operation And Maintenance Manual

Selection Procedures

• RLA = Rated Load Amps
• Compressor LRA = Locked Rotor Amps
• Compressor Input = VFD drive Input

Determination of Minimum Circuit Ampacity (MCA)

MCA = 1.25 x Largest motor amps/VFD Input + the sum of
the remaining motor amps.
Determination of Max Fuse (MFS) and Max
Circuit Breaker (MCB) sizes
MFS and MCB = 2.25 x Largest motor amps (RLA)/VFD
input) + the sum of the remaining motor amps.
Number of compressors
Table 14.
SCWMN
MSC 04L
66cc - ZPV0662 1
96cc - ZPV0962 0
ZP154KCE-TE 0
ZP181KCE-TE 1
Table 15. Number of fans/unit
MSC
Fans
*40-50 qty(4) fans optional
*70-80 qty(6) fans optional
Table 16. Compressor electrical data
ZP181KCE-TE
15 Ton
96CC-ZPV0962 (vfd)
Table 17. Fan motor electrical data
Drive (K3G500) - Motor (M3G150-IF)
PKG-SVX027A-EN
SCWMN SCWMN SCWMN
040 05L 050
0 1 0
1 0 1
0 2 2
1 0 0
40 Ton
3
200
RLA LRA
55.77 340
-
• Compressor Output = VFD drive output
• Voltage utilization range is ±10%
If the rating value calculation does not equal a standard
over current protective device rating, use the next lower
standard rating as the maximum.
SCWMN SCWMN
06L 060
1 0
0 1
0 0
2 2
50 Ton 60 Ton
3 4
460
RLA LRA
23.77 110
- - -
Installation - Electrical
SCWMN SCWMN SCWMN
07L 070 08L
1 0
0 1
3 3
0 0
70 Ton
5
200
INPUT OUTPUT INPUT
- - -
56 58 30
200
INPUT
18.6
SCWMN
080
1 0
0 1
0 0
3 3
80 Ton
5
460
OUTPUT
-
31
460
INPUT
9
37