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Example: Supply voltage is 460-3-60.
AB = 452 volts
BC = 464 volts
AC = 455 volts
Determine maximum deviation from average voltage:
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent voltage imbalance.
= 1.53%
This amount of phase imbalance is satisfactory as it is
below the maximum allowable 2%.
Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to electri-
cal components.
NOTE: If more than 2% voltage imbalance is present, contact
local electric utility.
208-VOLT OPERATION — All 208-230 volt units are factory
wired for 208 volts. The transformers may be switched to
230-volt operation (as illustrated on the wiring diagram) by
switching the red (208 volt) wire with the orange (230 volt)
wire at the L1 terminal.
BLOWER SELECTION — All water source heat pumps are
factory set with the appropriate motor and sheave combination
to achieve the desired airflow performance. Performance is
selected by matching the desired performance with the appro-
priate region in Tables 4-12.
NOTE: Factory-installed sheaves are field adjustable. Refer to
Tables 4-12 for adjustment points.
Table 3 — Electrical Data
Average Voltage =
452 + 464 + 455
3
=
1371
3
= 457
% Voltage Imbalance = 100 x
7
457
50RTP
UNIT SIZE
VOLTAGE
CODE
VOLTAGE
(V-Ph-Hz)
MIN/MAX
VOLTAGE
BLOWER
OPTION
COMPRESSOR MOTOR TOTAL
UNIT
FLA
MCA
MAX
FUSE/
HACR
Qty RLA LRA Qty FLA Hp
03
5 208-3-60 197/254 A,B,C 1 10.4 73.0 1 4.0 1.0 14.4 17.0 25
6 460-3-60 414/506 A,B,C 1 5.8 38.0 1 2.0 1.0 7.8 9.3 15
1 575-3-60 518/633 A,B,C 1 3.8 36.5 1 1.4 1.0 5.2 6.2 15
04
5 208-3-60 197/254
A,B,C 1 13.7 83.1 1 4.0 1.0 17.7 21.1 35
D,E 1 13.7 83.1 1 5.0 1.5 18.7 22.1 35
6 460-3-60 414/506
A,B,C 1 6.2 41.0 1 2.0 1.0 8.2 9.8 15
D,E 1 6.2 41.0 1 2.4 1.5 8.6 10.1 15
1 575-3-60 518/633
A,B,C 1 4.8 33.0 1 1.4 1.0 6.2 7.4 15
D,E 1 4.8 33.0 1 1.9 1.5 6.7 7.9 15
05
5 208-3-60 197/254
A,B,C 1 15.6 110.0 1 4.0 1.0 19.6 23.5 40
D,E 1 15.6 110.0 1 5.0 1.5 20.6 24.5 40
6 460-3-60 414/506
A,B,C 1 7.8 52.0 1 2.0 1.0 9.8 11.8 15
D,E 1 7.8 52.0 1 2.4 1.5 10.2 12.2 15
1 575-3-60 518/633
A,B,C 1 5.8 38.9 1 1.4 1.0 7.2 8.7 15
D,E 1 5.8 38.9 1 1.9 1.5 7.7 9.2 15
06
5 208-3-60 197/254
A,B,C 1 20.5 155.0 1 5.0 1.5 25.5 30.6 50
E 1 20.5 155.0 1 6.2 2.0 26.7 31.8 50
6 460-3-60 414/506
A,B,C 1 9.6 75.0 1 2.4 1.5 12.0 14.4 20
E 1 9.6 75.0 1 3.1 2.0 12.7 15.1 20
1 575-3-60 518/633
A,B,C 1 7.6 54.0 1 1.9 1.5 9.5 11.4 15
E 1 7.6 54.0 1 2.3 2.0 9.9 11.8 15
08
5 208-3-60 197/254
A,B,C 2 13.7 83.1 1 6.2 2.0 33.6 37.0 50
E 2 13.7 83.1 1 9.2 3.0 36.6 40.0 50
6 460-3-60 414/506
A,B,C 2 6.2 41.0 1 3.1 2.0 15.5 17.0 20
E 2 6.2 41.0 1 4.3 3.0 16.7 18.3 20
1 575-3-60 518/633
A,B,C 2 4.8 33.0 1 2.3 2.0 11.9 13.1 15
E 2 4.8 33.0 1 3.4 3.0 13.0 14.2 15
10
5 208-3-60 197/254
A,B,C 2 15.6 110.0 1 9.2 3.0 40.4 44.3 60
E 2 15.6 110.0 1 14.1 5.0 45.3 49.2 60
6 460-3-60 414/506
A,B,C 2 7.8 52.0 1 4.3 3.0 19.9 21.9 25
E 2 7.8 52.0 1 7.0 5.0 22.6 24.6 30
1 575-3-60 518/633
A,B,C 2 5.8 38.9 1 3.4 3.0 15.0 16.5 20
E 2 5.8 38.9 1 5.2 5.0 16.8 18.3 20
12
5 208-3-60 197/254
A,B,C 2 20.5 155.0 1 9.2 3.0 50.2 55.3 80
D,E 2 20.5 155.0 1 14.1 5.0 55.1 60.2 80
6 460-3-60 414/506
A,B,C 2 9.6 75.0 1 4.3 3.0 23.5 25.9 35
D,E 2 9.6 75.0 1 7.0 5.0 26.2 28.6 35
1 575-3-60 518/633
A,B,C 2 7.6 54.0 1 3.4 3.0 18.6 20.5 25
D,E 2 7.6 54.0 1 5.2 5.0 20.4 22.3 25