19
Unit--powered type: A unit--mounted transformer is
fact ory--installed to stepdown the main power supply
voltage to the unit to 115--v at t he 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. 22.
The primary leads to the convenience outlet transformer are
not factory--connected. Selection of primary power sour ce is
a customer--option. If local codes permit, the transf o rmer
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--energ ized when the unit discon nect or
HACR switch is open. See Fig. 23.
C08283
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
Fig. 23 -- Powe red Convenience Outlet 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 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 operati on 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 groundi ng wires and power line phasing
if the GFCI receptacle does not trip as required. Press the
RESET button to clear the tripped condition.
Fuse on power type: The factory fuse is a Bussman
“Fusetron” T--15, non--renewable screw--in (Edison base)
type plug fuse.
Installing Weatherproof Cover: A weathe rproof
while-in-use cover for the factory-installed convenienc e
outlets is now require d by UL standards. This cover
cannot be fa ctory-mounted due to its depth; it must be
installed at unit installation. For shipment, the
conveni ence outlet is c overed 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. LOCK--OU T AND TAG--OUT
ALL POWER.
Remove the blank cover plate at the convenience outlet;
discard the blank cover.
Loosen the t wo 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
backi ng pla te 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. 24. 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.
RECEPTACLE
NOT INCLUDED
COVER – WHILE-IN-USE
WEATHERPROOF
BASE PLATE FOR
GFCI RECEPTACLE
C09022
Fig. 24 -- Weatherproof Cover Installation
Using unit--mounted convenience outlets: Units with
unit--mounted convenienc e outlet circuits will often
require t hat two disconnects be opened to de--energize a ll
power to the unit. Treat all units as electrically energized
until the convenience outlet power is also c hecked and
de--energization is confirmed. Observe National Electrical
Code Article 210, Branch Ci rcuits, for use of c onvenience
outlets.
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