Carrier 38AK007 - Manual (Page 4)

FIELD POWER SUPPLY - All units except 208/230-v
units are factory wired for the voltage shown on the name­
plate. If the 208/230-v unit is to be connected to a 208-v
power supply, the transformer
must be rewired by moving
the black wire from the 230-v orange wire on the trans­
former and connecting it to the 200-v red wire from the
transformer. The end of the orange wire must then be
insulated.
Refer to unit label diagram for additional information.
Pigtails are provided for field wire connections. Use
factory-supplied splices or UL (Underwriters’ Laborato­
ries) approved copper/aluminum connector.
When installing units, provide a disconnect per NEC.
All field wiring must comply with NEC and local
requirements.
Install field wiring as follows;
1. Install conduit through side panel openings.
2. Install power lines to connections as shown in Fig. 3.
Wrap connections with electrical tape.
Voltage to compressor terminals during operation must
be within voltage range indicated on unit nameplate (also
see Table 4). On 3-phase units, voltages between phases
must be balanced within
2% and the current within 10%.
Use the formula shown in Table 4, Note 2, to determine the
% voltage imbalance. Operation on improper line voltage
or excessive phase imbalance constitutes abuse and may cause
damage to electrical components. Such operation would in­
validate any applicable Carrier warranty.
LEGEND
C — Contactor
NEC — National Electrical Code
---------- Field Wiring
Factory Wiring
Splice Connection
(Factory Supplied)
Fig. 3 — Power Wiring Connections
Table 4 — Electrical Data
UNIT
NOMINAL VOLTAGE VOLTAGE RANGE COMPR OFM POWER SUPPLY
(V-Ph-Hz) MIN MAX RLA LRA FLA MCA MOCP
208/230-3-60 187 254 19.0 142 1.9 25 6 351
460-3-60 414 508 9.5 72 1 0 12.9 17.6
38AK007 575-3-60 518 632 76 58 1.9 11.4 15.2
220-3-50 198 242 19.0 142 1.9 25.6 35.1
400-3-50 360 440 9.5 72 1.0 129 17.6
LEGEND
Canadian Standards Association
Full Load Amps
Heating, Air Conditioning and Refrigeration
Locked Rotor Amps
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code
Outdoor (Condenser) Fan Motor
Rated Load Amps
CSA
FLA
HACR
LRA
MCA
MOCP
NEC
OFM
RLA
NOTES:
1 In compliance with NEC requirements for multimotor and combi­
nation load equipment (refer to NEC Articles 430 and 440), the
overcurrent protective device for the unit shall be fuse or HACR
breaker.
2. 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 % voltage imbalance.
max voltage deviation from average voltage
= 100 X --------------------------------------------------------- -----------------------------------
average voltage
Example: Supply voltage is 460-3-60.
AB = 452 V
BC = 464 V
AC = 455 V
Average Voltage =
452 -H 464 -H 455
1371
3
^ 457
NOTE: The 575-v units are CSA only.
(AB) 457 - 452 = 5 V
(BC) 464 - 457 = 7 V
(AC) 457 - 455 = 2 V
Maximum deviation is 7 v.
Determine % voltage imbalance
7
% Voltage Imbalance = 100 x — = 1 53%
457
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 immedi­
ately.