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conform to the Class II temperature limitations described in the
NEC.
Refer to unit wiring diagrams Fig. 15-27 for a schematic
of
the field connections,
which must be made by the installing (or
electrical) contractor. 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. 28. 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 hnbalance:
% Voltage Imbalance
= 100 x
max voltage deviation from average voltage
average voltage
Example: Supply voltage is 460-3-60.
A
B C
AB=452volts
BC = 464 volts
AC = 455 volts
Average Voltage = 452 + 464 + 455
3
1371
3
= 457
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.
7
% Voltage Imbalance
= 100 x
457
= 1.53%
This amount
of phase
imbalance
is satisfactory
as it is
below the maxilnum
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 ilnbalance
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.
50PTH,
PTV, PTD
UNITS
V-PH-Hz*
VOLTAGE
MINIMAX
Table 4-
50PTH,PTV,PTD
Electrical Data
026
208/230-1-60
197/254
208/230-1-60
197/254
038
208/230-3-60
197/254
460-3-60
414/506
208/230-1-60
197/254
049
208/230-3-60
197/254
460-3-60
414/506
208/230-1-60
197/254
064
208/230-3-60
197/254
460-3-60
414/506
072
208/230-1-60
197/254
LEGEND
FLA
--
Full LoadAmps
HACR
--
Heating,
Air Conditioning
and Refrigeration
LRA
--
Locked
Rotor Amps
RLA
--
Rated Load Amps
HWR
--
Hot Water Reheat
COMPRESSOR
FAN
TOTAL
MIN
MAX
MOTOR
CIRCUIT
FUSE/
RLA
LRA
FLA
UNIT FLA
AMPS
HACR
10.3
52.0
4.3
14.6
17.2
25
16.7
82.0
4.3
21.0
25.2
40
11.2
58.0
4.3
15.5
18.3
25
4.5
29.0
4.1
8.6
9.7
15
21.2
96.0
7.0
28.2
33.5
50
13.5
88.0
7.0
20.5
23.9
35
6.4
41.0
6.9
13.3
14.9
20
25.6
118.0
7.0
32.6
39.0
60
17.6
123.0
7.0
24.6
29.0
45
9.0
62.0
6.9
15.9
18.2
25
27.2
150.0
7.0
34.2
41.0
60
UNITS WITH HWR
REHEAT
TOTAL
MIN
MAX
PUMP
UNIT
CIRCUIT
FUSE/
FLA
FLA
AMP
HACR
0.8
15.4
18.0
25
0.8
21.8
26.0
40
0.8
16.3
19.1
30
0.7
9.3
10.4
15
1.07
29.3
34.6
50
1.07
21.6
24.9
35
1.07
14.4
16.0
20
1.07
33.7
40.1
60
1.07
25.7
30.1
45
1.07
17.7
19.2
25
1.07
35.3
42.1
60
*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.
13
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