Carrier Gemini 38AU Series Installation, Start-Up And Service Instructions Manual page 16

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 instal-
lation. 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 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 approxi-
mately 1 / -in. (13 mm) under screw heads are exposed. Press the
2
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 per-
mit service tool cords to exit the cover. Check for full closing and
latching.
COVER - WHILE-IN-USE
WEATHERPROOF
BASEPLATE FOR
GFCI RECEPTACLE
Fig. 16 — Weatherproof Cover Installation
ALL UNITS
Voltage to compressor terminals during operation must be within
voltage range indicated on unit nameplate. See Tables 14-17 (on
pages 18-19). 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 Tables 14-17, Note 4 (see page 19) to de-
termine the percent of voltage imbalance. Operation on improper
line voltage or excessive phase imbalance constitutes abuse and
may cause damage to electrical components. Such operation
would invalidate any applicable Carrier warranty.
FIELD CONTROL WIRING
The 38AU unit control voltage is 24 v. See Appendix B Wiring
Diagrams (on pages 38-49) for typical 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 connections terminal board in the unit's control
box.
Remainder of the system controls connection will vary accord-
ing to the specific construction details of the indoor section (air
handler or packaged fan coil). Figures 17 (38AUZ) and 18
(38AUD) depict typical connections to a Carrier 40RU fan coil
unit. Plan for field connections carefully and install control wir-
ing correctly per the project plan. Additional components and
supplemental transformer accessory may be required.
The 38AU unit requires an external temperature control device.
This device can be a thermostat (field-supplied) or a PremierLink
GFCI RECEPTACLE
NOT INCLUDED
GASKET
16
controller (available as a field-installed accessory, for use on a
Carrier Comfort ® Network or as a stand alone control).
THERMOSTAT
Install a Carrier-approved accessory thermostat according to in-
stallation instructions included with the accessory. For typical
thermostat connections see Figures 17 (38AUZ) and 18 (38AUD).
Locate the thermostat accessory on a solid wall in the conditioned
space to sense average temperature in accordance with the ther-
mostat installation instructions.
(Note 3)
(Note 2)
(Note 2)
(Note 1)
Note 1: Connect only if thermostat requires 24-vac power source.
Note 2: Connect W1 and W2 if supplemental heaters are installed
Note 3: Y2 connection for Single Circuit/2-Stage units only
Field Wiring
Fig. 17 — Typical Remote Thermostat Connections -
(Note 1)
(Note 3)
(Note 3)
(Note 2)
Note 1: Typical multi-function marking. Follow manufacturer's configuration
instructions to select Y2.
Note 2: Connect only if thermostat requires 24-vac power source.
Note 3: Connect W1 and W2 if supplemental heaters are installed
Field Wiring
Fig. 18 — Typical Remote Thermostat Connections -
38AUZ
38AUD