Carrier 48DU Installation Instructions Manual page 14

UNIT
V- - PH- - HZ
SIZE
Min
024 208/230–1–60 187
030 208/230–1–60 187
036 208/230–1–60 187
042 208/230–1–60 187
048 208/230–1–60 187
060 208/230–1–60 187
LEGEND
FLA — Full Load Amps
LRA — Locked Rotor Amps
MCA -- Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
RLA — Rated Load Amps
NO TES:
1. In compliance with NEC (National Electrical Code) requirements
for multimotor and combination load equipment (refer to NE C
Articles 430 and 440), the overcurrent protective device for the
unit shall be Power Supply fuse. The CGA (Canadian Gas
Association) units may be fuse or circuit break er.
2. Minimum wire size is based on 60 C copper wire. I f other than
60 C wire is used, or if length exceeds wire length in table,
determine siz e from NEC. .
3. 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 .
% Voltage imbalance
max voltage deviation from average voltage
= 100 x
average voltage
Heater capacity (kW) based on heater voltage of 208v & 240v.
*
If power distibution voltage to unit varies from rated heater
voltage, heater kW will vary accordingly.
Infinity Furnace
Fig. 14 - - Control Voltage Wiring Connections
Table 3—Electrical Data - - Unit 48DU
VOLTAGE
COMPRESSOR
RANGE
Max RLA LRA
253 10.3 52.0
253 14.1 70.0
253 16.7 82.0
253 16.7 96.0
253 21.2 96.0
253 25.6 118.0
®
OUTDOOR INDOOR FAN
FAN MOTOR MOTOR
FLA FLA
0.9 4.3
0.9 4.3
0.9 6.8
0.9 6.8
1.5 6.8
1.9 9.1
EXAMPLE: Supply voltage is 230-3-60.
AB = 228 v
BC = 231 v
AC = 227 v
Average Voltage =
Determine maximum deviation from average voltage.
(AB) 229 - 228 = 1 v
(BC) 231 - 229 = 2 v
(AC) 229 - 227 = 2 v
Maximum deviation is 2 v.
Determine percent of voltage imbalance .
% Voltage Imbalance = 100 x
= 0.8%
This amount of phase imbalance is satisfactory as it is below the
maximum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is
more than 2%, contact your local electric utility company
immediately.
14
A06301
POWER SUPPLY
MCA MOCP
18.0/18.0 25/25
22.8/22.8 35/35
28.5/28.5 45/45
28.5/28.5 45/45
34.7/34.7 50/50
43.1/43.1 60/60
228 + 231 + 227
3
686
=
3
= 229
2
229