Carrier 38AU - Manual (Page 16)

16
Fig. 12 — Convenience Outlet Location
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 utility box containing the
duplex receptacle.
Unit-powered type: A unit-mounted transformer is factory-
installed to stepdown the main power supply voltage to the unit
to 115-v at the duplex receptacle. This option also includes a
manual switch with fuse, located in a utility box and mounted
on a bracket behind the convenience outlet; access is through
the unit's control box access panel. See Fig. 12.
The primary leads to the convenience outlet transformer are not
factory-connected. Selection of primary power source is a
customer-option. If local codes permit, the transformer primary
leads can be connected at the line-side terminals on the unit-
mounted non-fused disconnect or HACR breaker switch; this
will provide service power to the unit when the unit disconnect
switch or HACR switch is open. Other connection methods
will result in the convenience outlet circuit being de-energized
when the unit disconnect or HACR switch is open. See Fig. 13.
Duty Cycle: The unit-powered convenience outlet has a duty
cycle limitation. The transformer is intended to provide power
on an intermittent basis for service tools, lamps, etc; it is not
intended to provide 15-amps loading for continuous duty loads
(such as electric heaters for overnight use). Observe a 50%
limit on circuit loading above 8-amps (i.e., limit loads
exceeding 8-amps to 30 minutes of operation every hour).
Test the GFCI receptacle by pressing the TEST button on the
face of the receptacle to trip and open the receptacle. Check for
proper grounding wires and power line phasing if the GFCI
receptacle does not trip as required. Press the RESET button to
clear the tripped condition.
Fig. 13 - Powered Convenience Outlet Wiring
Fuse on power type: The factory fuse is a Bussman “Fusetron”
T-15, non-renewable screw-in (Edison base) type plug fuse.
Using unit-mounted convenience outlets: Units with unit-
mounded convenience outlet circuits will often require that two
disconnects be opened to de-energize all power to the unit.
Treat all units as electrically energized until the convenience
outlet power is also checked and de-energization is confirmed.
Observe and local codes, for use of convenience outlets.
Installing Weatherproof Cover –
A weatherproof while-in-use cover for the factory-installed
convenience outlets is required. This cover cannot be
factory-mounted due to its depth; it must be installed at unit
installation. 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.
DISCONNECT ALL POWER TO UNIT AND
CONVENIENCE OUTLET.
Remove the blank cover plate at the convenience outlet;
discard the blank cover.
Loosen the two screws at the GFCI duplex outlet, until
approximately 1 /
2
-in (13 mm) under screw heads are exposed.
Press the gasket over the screw heads. 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).
Mount the weatherproof cover to the backing plate as shown in
Fig. 14. Remove two slot fillers in the bottom of the cover to
permit service tool cords to exit the cover. Check for full
closing and latching.
Control Box
Access Panel
Pwd-CO
Transformer
Convenience
Outlet
GFCI
Pwd-CO
Fuse
Switch
UNIT
VOLTAGE
CONNECT
AS
PRIMARY
CONNECTIONS
TRANSFORMER
TERMINALS
208,
230
240
L1: RED + YEL
L2: BLU + GRA
H1 + H3
H2 + H4
460 480
L1: RED
Splice BLU +
YEL
L2: GRA
H1
H2 + H3
H4
575 600
L1: RED
L2: GRA
H1
H2