Carrier 50HC Series, Руководство по установке

Страница: 17 / 52

17
UNITS WITHOUT FACTORY-INSTALLED NON-FUSED
DISCONNECT OR HACR
When installing units, provide a disconnect switch per NEC (Na-
tional 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 infor-
mative plate. See Fig. 22 and the unit label diagram for power wir-
ing connections to the unit power terminal blocks and equipment
ground. Maximum wire size is #2ga AWG (copper only) per pole
on contactors, #2ga AWG (copper only) per pole on optional dis-
connect or HACR, and 4/0 AWG (copper only) per pole on termi-
nal or fuse block on units with single point box. See Fig. 22 and
unit label diagram for field power wiring connections.
Provide a ground fault and short circuit over-current protection de-
vice (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 208/230v units are factory wired for the voltage
shown on the nameplate. If the 208/230v unit is to be connected to
a 208v power supply, the control transformer must be rewired by
removing the black wire with the 1 /
4
-in. female spade connector
from the 230v connection and moving it to the 200v 1 /
4
-in. male
terminal on the primary side of the transformer. Refer to unit label
diagram for additional information. Field power wires will be
connected at line-side pressure lugs on the power terminal block
or at factory-installed option non-fused disconnect.
NOTE: Check all factory and field electrical connections for
tightness.
CONVENIENCE OUTLETS
Two types of convenience outlets are offered on 50HC models:
non-powered and unit-powered. Both types provide a 125-volt
GFCI (ground-fault circuit interrupter) duplex receptacle rated at
15A behind a hinged waterproof access cover, located on the end
panel of the unit. See Fig. 27.
NOTE: Unit powered convenience outlets are not available as fac-
tory installed options for single phase (-3 voltage code) models.
Fig. 27 — Convenience Outlet Location
Installing Weatherproof Cover
A weatherproof while-in-use cover for the factory-installed conve-
nience outlets is now required by UL standards. This cover cannot
be factory-mounted due its depth; it must be installed at unit instal-
lation. For shipment, the convenience outlet is covered with a
blank cover plate.
The weatherproof cover kit is shipped in the unit’s control box.
The kit includes the hinged cover, a backing plate, and gasket.
1. Remove the blank cover plate at the convenience outlet; dis-
card the blank cover.
2. Loosen the two screws at the GFCI duplex outlet, until
approximately 1/2 -in. (13 mm) under screw heads is exposed.
Press the gasket over the screw heads.
3. Slip the backing plate over the screw heads at the keyhole
slots and align with the gasket; tighten the two screws until
snug (do not over-tighten).
4. Mount the weatherproof cover to the backing plate as shown
in Fig. 28.
5. Remove two slot fillers in the bottom of the cover to permit
service tool cords to exit the cover.
6. Check for full closing and latching.
Fig. 28 — Weatherproof Cover Installation
WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or
death.
Units with convenience outlet circuits may use multiple
disconnects. Check convenience outlet for power status before
opening unit for service. Locate its disconnect switch, if
appropriate, and open it. Lock-out and tag-out this switch, if
necessary.
CONVENIENCE
OUTLET GFCI
PWD-CO FU S E
S WITCH
PWD-CO TRAN S FORMER
CONTROL BOX
ACCE
SS PANEL
COVER - WHILE-IN-USE
WEATHERPROOF
BASEPLATE FOR
GFCI RECEPTACLE
GASKET
GFCI RECEPTACLE
NOT INCLUDED
TOP
TO
P
TOP
WET LOC
ATIONS
W
ET
L
OC
ATI
ON
S