Carrier 38AUQ 16 Series, Installation, Start-Up And Service Instructions Manual

Page: 14 / 48

14
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.
C10206
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. 11 -- Powered Convenience Outlet Wiring
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 installed at unit 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 ALL POWER TO UNIT AND
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
approximately
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 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. 12 -- Weatherproof Cover Installation
All Units —
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Table 7. 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 7, Note 5 (see
pages 14) to determine 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 —
38AUQ unit control voltage is 24 v. See Fig. 20 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. Fig. 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 PremierLink controller (available as a field-installed
accessory, for use on a Carrier Comfort Network or as a
stand alone control).
38A
U
Q