Carrier Gemini 38AU07 Series Installation Instructions Manual page 16

WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury
or death.
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 conve-
nience outlet power is also checked and de-energization is
confirmed. Observe National Electrical Code Article 210,
Branch Circuits, for use of convenience outlets.
Installing Weatherproof Cover
A weatherproof while in use cover for the factory installed
convenience outlets is now required by UL standards. This
cover cannot be factory mounted due its depth; it must be in-
stalled at unit installation. For shipment, the convenience out-
let 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 CONVE-
NIENCE OUTLET.
Remove the blank cover plate at the convenience outlet;
discard the blank cover.
Loosen the two screws at the GFCI duplex outlet, until ap-
proximately / -in. (13 mm) under screw heads are exposed.
1
2
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. 16. 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.
ALL UNITS
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See Tables
13-16. On 3-phase units, voltages between phases must be bal-
anced within 2% and the current within 10%. Use the formula
shown in the legend for Tables 13-16, Note 4 (see page 18) to
determine the percent of voltage imbalance. Operation on im-
proper line voltage or excessive phase imbalance constitutes
abuse and may cause damage to electrical components. Such
operation would invalidate any applicable Carrier warranty.
COVER - WHILE-IN-USE
WEATHERPROOF
Fig. 16 — Weatherproof Cover Installation
FIELD CONTROL WIRING
38AU unit control voltage is 24 v. See Fig. 17-19 for typi-
cal field control connections and the unit's label diagram for
field-supplied wiring details. Route control wires to the
38AU unit through the opening in unit's end panel to the con-
nections terminal board in the unit's control box.
Remainder of the system controls connection will vary ac-
cording to the specific construction details of the indoor section
(air handler or packaged fan coil). Fig. 20 (38AUZ) and 21
(38AUD) depict typical connections to a Carrier 40RU 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 38AU unit requires an external temperature control de-
vice. This device can be a thermostat (field-supplied) or a Pre-
mierLink controller (available as a field-installed accessory, for
use on a Carrier Comfort
16
GFCI RECEPTACLE
NOT INCLUDED
GASKET
BASEPLATE FOR
GFCI RECEPTACLE
® Network or as a stand alone control).