Carrier Gemini 38AU 07 Series Installation, Start-Up And Service Instructions Manual page 15

ELECTRIC
DISCONNECT
SWITCH
Fig. 12 — Disconnect Switch and Unit
UNITS WITH FACTORY-INSTALLED NON-FUSED DIS-
CONNECT
The factory-installed option disconnect switch is located in a
weatherproof enclosure located under the main control box. The
manual switch handle is accessible through an opening in the ac-
cess panel.
UNITS WITHOUT FACTORY-INSTALLED NON-FUSED
DISCONNECT
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 cabi-
net 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. 13 for power wiring connections to the unit
contactor and terminal block and equipment ground.
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.
All units except 208/230-v units are factory wired for the voltage
shown on the nameplate. If the 208/230-v unit is to be connected
to a 208-v power supply, the control transformer must be rewired
by moving the black wire with the
from the 230-v connection and moving it to the 208-v
terminal on the primary side of the transformer. Refer to unit label
diagram for line-side information.
Affix the crankcase heater warning sticker to the unit disconnect
switch.
CONVENIENCE OUTLETS
WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury or
death.
Units with convenience outlet circuits may use multiple dis-
connects. Check convenience outlet for power status before
opening unit for service. Locate its disconnect switch, if appro-
priate, and open it. Lock-out and tag-out this switch, if neces-
sary.
Two types of convenience outlets are offered on 38AU models:
Non-powered and unit-powered. Both types provide a 125-volt
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. 14.
COPPER
WIRE ONLY
ALUMINUM
WIRE
/ -in. female spade connector
1
4
/ -in. male
1
4
Units Without Disconnect Option
Units With Disconnect Option
L1
2
L2 4
L3
6
Disconnect factory test leads; discard.
Fig. 13 — Power Wiring Connections
Non-Powered Type
This type requires the field installation of a general-purpose 125-
volt 15-A circuit powered from a source elsewhere in the building.
Observe national and local codes when selecting wire size, fuse or
breaker requirements and disconnect switch size and location.
Route 125-v power supply conductors into the bottom of the utili-
ty box containing the duplex receptacle. Maximum continuous
current for this type of convenience outlet (non-unit powered)
must not exceed 8 Amps.
Unit-Powered Type
A unit-mounted transformer is factory-installed to step down the
main power supply voltage to the unit to 115-v at the duplex re-
ceptacle. This option also includes a manual switch with fuse, lo-
cated in a utility box and mounted on a bracket behind the conve-
nience outlet; access is through the unit's control box access panel.
See Fig. 14.
Convenience
Outlet
GFCI
Pwd-CO
Fuse
Switch
Fig. 14 — Convenience Outlet Location
The primary leads to the convenience outlet transformer are not
factory-connected. Selection of primary power source is a custom-
er-option. If local codes permit, the transformer primary leads can
15
C TB1
11 13
Disconnect
per
NEC
L1
L2 L3
208/230-3-60
460-3-60
575-3-60
1
Optional
Disconnect
3
Switch
5
Pwd-CO
Transformer
Control Box
Access Panel
Factory
Wiring