Specifications

16
Connections for condenser flow switch, chilled fluid pump
interlock, condenser pump interlock, remote alarm output, con-
denser output, and dual chiller thermistor accessory are made at
these locations. See Fig. 17 for specific location of connec-
tions.
The unit has the capability to control field-supplied devices.
They are: alarm signal, condenser pump or condenser fan out-
put, and chilled water pump output. The unit provide 24-v
power with a minimum 5 va rating per output allowed.
UNBALANCED 3-PHASE SUPPLY VOLTAGE — Never
operate a compressor where a phase imbalance in the supply
voltage is greater than 2%. Use the following formula to deter-
mine the percent voltage imbalance:
% Voltage Imbalance =
100 x
max voltage deviation from average voltage
average voltage
EXAMPLE: Supply voltage is 240-3-60.
AB = 243 v
BC = 236 v
AC = 238 v
Average Voltage =
243 + 236 + 238
3
= 239 v
Determine maximum deviation from average voltage:
(AB) 243 – 239 = 4 v
(BC) 239 – 236 = 3 v
(AC) 239 – 238 = 1 v
Maximum deviation is 4 v.
Determine percent voltage imbalance:
% Voltage Imbalance = 100 x
4
239
=1.7%
This amount of phase imbalance is satisfactory as it is below
the maximum allowable 2%.
Table 8 — Electrical Data — 30MPA,MPW Units
LEGEND
*Supply Range — Units are suitable for use on electrical systems
where voltage supplied to the unit terminals is not below or above
the listed range limits.
NOTES:
1. All units have one field power terminal block.
2. Maximum incoming wire size is as follows:
For units with terminal block:
350 kcmil for unit sizes 030-045; 208/230-3-60 voltages.
2/0 for all other unit sizes; all voltages.
For units with optional non-fused disconnect:
350 kcmil for unit sizes:
030-045; 208/230-3-60 voltages.
045; 380-3-60 voltage.
3/0 for unit sizes:
015,020; 208/230-3-60 voltages.
020-040; 380-3-60 voltage.
030-045; 460-3-60 and 575-3-60 voltages.
2 AWG for unit sizes:
015; 380-3-60 voltage.
015-020; 460-3-60 and 575-3-60 voltages.
3. Additional control circuit power is not required.
4. Any field modification of factory wiring must be in compliance
with all applicable codes. Field-installed power wires must be
rated 75 C minimum.
5. Use copper conductors only.
6. Control circuit power supply is 24-v single phase. Control
power is supplied by the factory-installed control transformer.
IMPORTANT: If the supply voltage phase imbalance
is more than 2%, contact your local utility company
immediately.
UNIT SIZE
30MPA,MPW
VOLTS
NAMEPLATE
(3 ph, 60 Hz)
VOLTAGE* COMPRESSOR UNIT
Quantity
LRA
(ea.)
MCA ICF MOCP
Rec
Fuse
Min Max
015
208/230 187 253
2
195 66.4 224.5 90 80
380 342 418
123 37.6 139.7 50 45
460 414 508
95 33.1 109.7 45 40
575 518 632
80 27.5 92.2 35 35
020
208/230 187 253
2
239 80.6 274.8 110 90
380 342 418
145 53.4 168.7 70 60
460 414 508
125 40.3 142.9 50 45
575 518 632
80 32.2 94.3 45 40
030
208/230 187 253
2
340 125.6 395.8 175 150
380 342 418
196 76.5 230.0 110 90
460 414 508
179 60.5 205.9 8070
575 518 632
132 53.3 155.7 70 60
040
208/230 187 253
3
300 166.7 402.6 200 200
380 342 418
139 8
7.4 192.8 110 100
460 414 508
150 75.1 196.2 90 90
575 518 632
109 64.7 148.88070
045
208/230 187 253
3
340 181.4 451.6 225 200
380 342 418
196 110.5 264.0 125 125
460 414 508
179 87.4 232.8 110 100
575 518 632
132 77.0 179.4 100 90
AWG — American Wire Gage
ICF — Maximum instantaneous current flow during starting.
kcmil — Thousand circular mils
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps (for wire sizing). Complies with
NEC, Section 430-24.
MOCP — Maximum Overcurrent Protection
Rec
Fuse
— Recommended dual element fuse amps (150% of com-
pressor RLA). Size up to the next standard fuse size.
RLA — Rated Load Amps