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 suita
b
le for use on electrical systems
where voltage supplied to the unit terminals is not
b
elow or a
b
ove
the listed range limits.
NOTES:
1. All units have one field power terminal
b
lock.
2. Maximum incoming wire size is as follows:
For units with terminal
b
lock:
350 kcmil for unit sizes 030-045; 20
8
/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; 20
8
/230-3-60 voltages.
045; 3
8
0-3-60 voltage.
3/0 for unit sizes:
015,020; 20
8
/230-3-60 voltages.
020-040; 3
8
0-3-60 voltage.
030-045; 460-3-60 and 575-3-60 voltages.
2 AWG for unit sizes:
015; 3
8
0-3-60 voltage.
015-020; 460-3-60 and 575-3-60 voltages.
3. Additional control circuit power is not re
q
uired.
4. Any field modification of factory wiring must
b
e in compliance
with all applica
b
le codes. Field-installed power wires must
b
e
rated 75 C minimum.
5. Use copper conductors only.
6. Control circuit power supply is 24-v single phase. Control
power is supplied
b
y 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
20
8
/230
1
8
7
253
2
195
66.4
224.5
90
8
0
3
8
0
342
41
8
123
37.6
139.7
50
45
460
414
50
8
95
33.1
109.7
45
40
575
51
8
632
8
0
27.5
92.2
35
35
020
20
8
/230
1
8
7
253
2
239
8
0.6
274.
8
110
90
3
8
0
342
41
8
145
53.4
16
8
.7
70
60
460
414
50
8
125
40.3
142.9
50
45
575
51
8
632
8
0
32.2
94.3
45
40
030
20
8
/230
1
8
7
253
2
340
125.6
395.
8
175
150
3
8
0
342
41
8
196
76.5
230.0
110
90
460
414
50
8
179
60.5
205.9
8
0
70
575
51
8
632
132
53.3
155.7
70
60
040
20
8
/230
1
8
7
253
3
300
166.7
402.6
200
200
3
8
0
342
41
8
139
8
7.4
192.
8
110
100
460
414
50
8
150
75.1
196.2
90
90
575
51
8
632
109
64.7
14
8
.
8
8
0
70
045
20
8
/230
1
8
7
253
3
340
1
8
1.4
451.6
225
200
3
8
0
342
41
8
196
110.5
264.0
125
125
460
414
50
8
179
8
7.4
232.
8
110
100
575
51
8
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
