16
VersaTemp™ Water-to-Water Heat Pumps
MCA
WIRE SIZE (AWG) 75°
(3 Conductors/1 Conduit)
50
8
65
6
85
4
100
3
115
2
130
1
150
1/0
175
2/0
200
3/0
230
4/0
255
250 MCM
285
300 MCM
310
350 MCM
335
400 MCM
380
500 MCM
420
600 MCM
MCA
WIRE SIZE (AWG) 75°
(6 Conductors/2 Conduit)
510
250 MCM
570
300 MCM
620
350 MCM
670
400 MCM
760
500 MCM
800
600 MCM
Compressor Rated Load Amps (RLA) and Locked Rotor Amps (LRA)
NOTE:
RLA and LRA are for each compressor.
MCA = (1.25 x RLA1*) + RLA2 + RLA3+ RLA4
Fuse Sizing: Maximum Overcurrent Protection (MOP), Type RK5 Fuse, or HACR Time Delayed
Circuit Breaker
MOP= (2.25 x RLA1*) + RLA2
Where the MOP does not equal a standard size rating, the next larger size should be used. The
MOP should not exceed 800 amps.
*NOTE
:
RLA1 = RLA of the largest compressor in the system; RLA2 , RLA3 & RLA4 = RLA of the
other compressors in the system.
The total system Minimum Circuit Ampacity (MCA) shall not exceed 760A. Wire sizing is based
on the National Electric Code (NEC) rating for 75°C copper wire, three wires per conduit. Wiring
distance from branch circuit shall not exceed 100 feet.
System Wire & Fuse Sizing Specifications
(Applicable codes may require different wire sizing)
No. of
Compressors
208/3/60
RLA/LRA
230/3/60
RLA/LRA
460/3/60
RLA/LRA
575/3/60
RLA/LRA
ARA020X
2
44/239
40/239
20/125
16/80
ARA030X
2
68/340
61/340
31/173
25/132
ARA060
2
N/A
N/A
60/310
48/239
RLA/LRA Per Compressor
Electrical & Piping Information
Hot Water
Side
Cold Water
Side
Pressure Taps
Pressure Taps
Sensor
Wells
Sensor
Wells
Isolation
Valves
Isolation
Valve
Flow/DP
Switch
Flow/DP
Switch
Pump
Pump
Strainer
Items in Shaded Area Included
with Chiller
Strainer
Fan Electrical Data
Consult as-ordered/as-built submittals for fan data.
Recommended Water Piping
Multistack recommends a MINIMUM two to three minute water piping loop time.
