Carrier 48TC series, Инструкции по обслуживанию и техническому обслуживанию, Страница: 24 / 112

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CONVENIENCE OUTLETS
Two types of convenience outlets are offered on 48TC models:
non-powered and unit-powered. Both types provide a 125-v
Ground-Fault Circuit-Interrupter (GFCI) duplex receptacle rated
at 15A behind a hinged waterproof access cover, located on the
end panel of the unit. See Fig. 32.
Fig. 32 — Convenience Outlet Location
Non-Powered Type
This type requires the field installation of a general-purpose 125-v
15A circuit powered from a source elsewhere in the building. Ob -
serve national and local codes when selecting wire size, fuse or
breaker requirements and disconnect switch size and location.
Route 125V 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 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. 33 for wiring.
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 heat -
ers 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).
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
be connected at the line-side terminals on a unit-mounted non-
fused disconnect or circuit breaker switch; this will provide
service power to the unit when the unit disconnect switch or cir -
cuit breaker is open. Other connection methods will result in the
convenience outlet circuit being de-energized when the unit dis -
connect or circuit breaker is open. See Fig. 33.
Fig. 33 — Powered Convenience Outlet Wiring
Wet in Use Convenience Outlet Cover
The unit has a “wet in use” convenience outlet cover that must be
installed on the panel containing the convenience outlet. This cov -
er provides protection against moisture entering the GFCI recepta -
cle. This cover is placed in the unit control box during shipment.
GFCI Maintenance
Periodically test the GFCI receptacle by pressing the TEST button
on the face of the receptacle.
1. Press the TEST button on the face of the receptacle. This
should cause the internal circuit of the receptacle to trip and
open the receptacle.
2. Check for proper grounding and power line phasing should
the GFCI receptacle fail to trip.
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 FUSE
SWITCH
PWD-CO TRANSFORMER
CONTROL BOX
ACCESS PANEL
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