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conform to the Class II temperature limitations described in the
NEC.
Refer to unit wiring diagrams Fig. 15-24 for a schematic of
the field connections, which must be made by the installing (or
electrical) contractor. For Deluxe D with WSHP Open controls
3-phase units and Complete C with Open controls single-phase
and 3-phase units contact Application Engineering. Refer to
Table 4 for fuse sizes.
Consult the unit wiring diagram located on the inside of the
compressor access panel to ensure proper electrical hookup.
The installing (or electrical) contractor must make the field
connections when using field-supplied disconnect.
Operating voltage must be the same voltage and phase as
shown in electrical data shown in Table 4.
Make all final electrical connections with a length of flexi-
ble conduit to minimize vibration and sound transmission to
the building.
POWER CONNECTION — Make line voltage connection
by connecting the incoming line voltage wires to the line
side of the compressor contactor terminal as shown in
Fig. 25. See Table 4 for amperage ratings to provide correct
wire and maximum overcurrent protection sizing.
SUPPLY VOLTAGE — Operating voltage to unit must be
within voltage range indicated on unit nameplate.
On 3-phase units, voltages under load between phases must
be balanced within 2%. Use the following formula to deter-
mine the percentage voltage imbalance:
% Voltage Imbalance
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.
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
your 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 by switching the red (208 volt) wire with
the orange (230 volt) wire at the L1 terminal.
460-VOLT OPERATION — Units using 460-v and an ECM
(electronically commutated motor) fan motor, modulating
HWR, and/or internal secondary pump will require a neutral
wire from the supply side in order to feed accessory with
265-v.
Table 4 — 50PTH,PTV,PTD Electrical Data
LEGEND *The 460-v units using an ECM (electronically commutated motor) fan
motor, modulating HWR, and/or an internal secondary pump will require
a neutral wire from the supply side in order to feed the accessory with
265-v.
= 100 x
max voltage deviation from average voltage
average voltage
Average Voltage =
452 + 464 + 455
3
=
1371
3
= 457
% Voltage Imbalance = 100 x
7
457
= 1.53%
50PTH,
PTV, PTD
UNITS
V-PH-Hz*
VOLTAGE
MIN/MAX
COMPRESSOR
FAN
MOTOR
FLA
TOTAL
UNIT FLA
MIN
CIRCUIT
AMPS
MAX
FUSE/
HACR
UNITS WITH HWR
RLA LRA
REHEAT
PUMP
FLA
TOTAL
UNIT
FLA
MIN
CIRCUIT
AMP
MAX
FUSE/
HACR
026 208/230-1-60 197/254 10.3 52.0 4.3 14.6 17.2 25 0.8 15.4 18.0 25
038
208/230-1-60 197/254 16.7 82.0 4.3 21.0 25.2 40 0.8 21.8 26.0 40
208/230-3-60 197/254 11.2 58.0 4.3 15.5 18.3 25 0.8 16.3 19.1 30
460-3-60 414/506 4.5 29.0 4.1 8.6 9.7 15 0.7 9.3 10.4 15
049
208/230-1-60 197/254 21.2 96.0 7.0 28.2 33.5 50 1.07 29.3 34.6 50
208/230-3-60 197/254 13.5 88.0 7.0 20.5 23.9 35 1.07 21.6 24.9 35
460-3-60 414/506 6.4 41.0 6.9 13.3 14.9 20 1.07 14.4 16.0 20
064
208/230-1-60 197/254 25.6 118.0 7.0 32.6 39.0 60 1.07 33.7 40.1 60
208/230-3-60 197/254 17.6 123.0 7.0 24.6 29.0 45 1.07 25.7 30.1 45
460-3-60 414/506 9.0 62.0 6.9 15.9 18.2 25 1.07 17.7 19.2 25
072 208/230-1-60 197/254 27.2 150.0 7.0 34.2 41.0 60 1.07 35.3 42.1 60
FLA — Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
LRA — Locked Rotor Amps
RLA — Rated Load Amps
HWR — Hot Water Reheat