Units Without Factory-Installed Non-Fused Disconnect Or Hacr; All Units; Convenience Outlets - Carrier WeatherExpert 48LC 07 Series Installation Instructions Manual

Fig. 37 — HACR Handle and Shaft Assembly
UNITS WITHOUT FACTORY-INSTALLED NON-FUSED
DISCONNECT OR HACR
When installing units, provide a disconnect switch per NEC
(National Electrical Code) of adequate size. Disconnect sizing
data is provided on the unit informative plate. Locate on unit
cabinet or within sight of the unit per national or local codes.
Do not cover unit informative plate if mounting the disconnect
on the unit cabinet.

ALL UNITS

All field wiring must comply with NEC and all local codes.
Size wire based on MCA (Minimum Circuit Amps) on the unit
informative plate. See Fig. 25 and unit label diagram for power
wiring connections to the unit and equipment ground. Maxi-
mum wire size is #4 ga AWG (copper only) per pole on contac-
tors and #2 ga AWG (copper only) per pole on optional non-
fused disconnect or HACR.
Provide a ground-fault and short-circuit over-current protection
device (fuse or breaker) per NEC Article 440 (or local codes).
Refer to unit informative data plate for MOCP (Maximum
Over-current Protection) device size.
NOTE: Units ordered with factory-installed HACR do not need an
additional ground-fault and short-circuit over-current protective
device unless required by local codes.
All field wiring must comply with the NEC and local
requirements.
All units except 208/230-v units are factory wired for the volt-
age shown on the nameplate. If the 208/230-v unit is to be con-
nected to a 208-v power supply, the control transformer must
be rewired by moving the black wire with the
spade connector from the 230-v connection and moving it to
the 200-v 1 / -in. male terminal on the primary side of the trans-
4
former. Refer to unit label diagram for additional information.
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. On 3-phase
units, voltages between phases must be balanced within 2%
and the current within 10%. Use the formula shown below to
determine the percent of voltage imbalance. Operation on im-
proper line voltage or excessive phase imbalance constitutes
abuse and may cause damage to electrical components. Such
operation would invalidate any applicable Carrier warranty.
% Voltage Imbalance:
max voltage deviation from average
= 100 x
1 / -in. female
4
voltage
average voltage
Example: Supply voltage is 230-3-60
A B
MOTOR
Average Voltage =
Determine maximum deviation from average voltage.
(AB) 227-224 = 3 v
(BC) 231-227 = 4 v
(AC) 227-226 = 1 v
Maximum deviation is 4 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100x
This amount of phase imbalance is satisfactory as it is below the maxi-
mum allowable 2%.
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately.
NOTE: Check all factory and field electrical connections for tightness.

CONVENIENCE OUTLETS

ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal inju-
ry or death.
Units with convenience outlet circuits may use multiple
disconnects. Check convenience outlet for power status be-
fore opening unit for service. Locate its disconnect switch,
if appropriate, and open it. Lock-out and tag-out this
switch, if necessary.
Two types of convenience outlets are offered on 48LC models:
non-powered and unit-powered. Both types provide a 125-v
GFCI (ground-fault circuit-interrupter) duplex receptacle rated
at 15-A behind a hinged waterproof access cover, located on
the end panel of the unit. See Fig. 38.
CONVENIENCE
OUTLET GFCI
Fig. 38 — Convenience Outlet Location
Installing Weatherproof Cover
A weatherproof while-in-use cover for the factory-installed
convenience outlets is now required by UL standards. This
cover cannot be factory-mounted due to its depth; it must be
25
AB = 224 v
C
BC = 231 v
AC = 226 v
(224 + 231 + 226) 68
1
=
3 3
4
2
=1.78%
2
7
WARNING
PWD-CO TRANSFORMER
PWD-CO FUSE
SWITCH
CONTROL BOX
ACCESS PANEL
=227