8
Table 3 — 38HDR Electrical Data
LEGEND
*Permissible limits of the voltage range at which unit will operate
satisfactorily.
NOTES:
1. Control circuit is 24 v on all units and requires an external power
source.
2. All motors and compressors contain internal overload protection.
3. In compliance with NEC (U.S.A. Standard) requirements for mul-
timotor and combination load equipment (refer to NEC Articles
430 and 440), the overcurrent protective device for the unit shall
be fuse or HACR breaker.
4. Motor RLA values are established in accordance with UL (Under-
writers’ Laboratories) Standard 465 (U.S.A. Standard).
5. 38HDF,HDR018-030 units are only available in single-phase
voltage.
6.
Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply volt-
age is greater than 2%.
Use the following formula to determine
the percentage of voltage imbalance:
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
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 percentage of voltage imbalance:
This amount of phase imbalance is satisfactory as it is below the
maximum allowable of 2%
38HDR
UNIT SIZE
V-PH-Hz
VOLTAGE RANGE*
COMPRESSOR
OUTDOOR FAN MOTOR
MIN CKT
AMPS
FUSE/HACR
BKR AMPS
Min
Max
RLA
LRA
FLA
NEC Hp
kW Out
018
208/230-1-60
187
253
10.0
48.0
0.80
0.125
0.09
13.3
20
024
208/230-1-60
187
253
14.3
58.3
0.80
0.125
0.09
18.7
30
030
208/230-1-60
187
253
15.7
64.0
1.45
0.25
0.19
21.1
35
036
208/230-1-60
187
253
15.7
77.0
1.45
0.25
0.19
21.1
35
208/230-3-60
187
253
10.4
88.0
1.45
0.25
0.19
14.5
20
460-3-60
414
506
6.3
38.0
0.80
0.25
0.19
8.7
15
048
208/230-1-60
187
253
24.3
117.0
1.45
0.25
0.19
31.8
55
208/230-3-60
187
253
15.6
83.1
1.45
0.25
0.19
21.0
35
460-3-60
414
506
6.9
41.0
0.80
0.25
0.19
9.4
15
060
208/230-1-60
187
253
29.4
134.0
1.45
0.25
0.19
38.2
65
208/230-3-60
187
253
17.8
110.0
1.45
0.25
0.19
23.7
40
460-3-60
414
506
8.6
52.0
0.80
0.25
0.19
11.6
20
FLA
—
Full Load Amps
HACR —
Heating, Air Conditioning, Refrigeration
LRA
—
Locked Rotor Amps
NEC
—
National Electrical Code
RLA
—
Rated Load Amps (Compressor)
= 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%
IMPORTANT: Contact your local electric utility company immedi-
ately if the supply voltage phase imbalance is more than 2%.