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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. 11.
Duty Cycle: The unit-powered convenience outlet has a duty cycle
limitation. The transformer is intended to provide power on an in-
termittent basis for service tools, lamps, etc; it is not intended to
provide 15-amps loading for continuous duty loads (such as elec-
tric 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.
Fuse on power type: The factory fuse is a Bussman
"Fusetron
"
T-15, non-renewable screw-in (Edison base) type
™
1
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
National Electrical Code Article 210, Branch Circuits, for use of
convenience outlets.
UNIT
CONNECT
VOLTAGE
AS
L1: RED + YEL
208, 230
240
L2: BLU + GRA
L1: RED
460
480
Splice BLU + YEL
L2: GRA
L1: RED
575
600
L2: GRA
Fig. 11 — Powered Convenience Outlet Wiring
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
1. Third-party trademarks and logos are the property of their respective
owners.
PRIMARY
TRANSFORMER
CONNECTIONS
TERMINALS
H1 + H3
H2 + H4
H1
H2 + H3
H4
H1
H2
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
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 approxi-
mately 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 overtighten).
Mount the weatherproof cover to the backing plate as shown in
Fig. 12. Remove two slot fillers in the bottom of the cover to per-
mit service tool cords to exit the cover. Check for full closing and
latching.
Cover — While-In-Use
Weatherproof
™1
Fig. 12 — Weatherproof Cover Installation
ALL UNITS
Voltage to compressor terminals during operation must be within
voltage range indicated on unit nameplate. See Table 9. On
3-phase units, voltages between phases must be balanced within
2% and the current within 10%. Use the formula shown in the
legend for Table 9, Note a (see page 16) to determine the percent
of voltage imbalance. Operation on improper line voltage or ex-
cessive phase imbalance constitutes abuse and may cause damage
to electrical components. Such operation would invalidate any ap-
plicable Carrier warranty.
FIELD CONTROL WIRING
38AUQ unit control voltage is 24 v. See Fig. 13 for typical field
control connections and the unit's label diagram for field-supplied
wiring details. Route control wires to the 38AUQ unit through the
opening in unit's end panel to the connections terminal board in
the unit's control box.
Remainder of the system controls connection will vary according
to the specific construction details of the indoor section. Figure 13
depicts typical connections to a Carrier 40RUQ fan coil unit. Plan
for field connections carefully and install control wiring correctly
per the project plan. Additional components and supplemental
transformer accessory may be required.
The 38AUQ unit requires an external temperature control device.
This device can be a thermostat (field-supplied) or a thermostatic
emulation device provided as part of a third-party Building Man-
agement System.
14
ALL
POWER
TO
GFCI Receptacle
Not Included
Baseplate For
GFCI Receptacle
UNIT
AND
Gasket
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