Carrier 38AUZ*07 Series Installation, Start-Up And Service Instructions Manual page 54

WARNING
!
FIRE HAZARD
Failure to follow this warning could cause in personal
injury, death and/or equipment damage.
Do not connect aluminum wire between disconnect
switch and condensing unit. Use only copper wire.
(See Fig. 10.)
ELECTRIC
DISCONNECT
SWITCH
WIRE ONLY
ALUMINUM
Fig. 10 - - Disconnect Switch and Unit
Units Without Factory-Installed Disconnect —
When installing units, provide a disconnect switch of
adequate size per local or national wiring code.
Disconnect sizing data is provided on the unit informative
plate. Locate on unit cabinet or within sight of the unit per
national or local codes. Do not cover unit informative
plate if mounting the disconnect on the unit cabinet.
Units with Factory-Installed Disconnect —
The factory-installed option disconnect switch is located
in a weatherproof enclosure located under the main
control box. The manual switch handle is accessible
through an opening in the access panel.
All units -
All field wiring must comply with all local codes. Size
wire based on MCA (Minimum Circuit Amps) on the unit
informative plate. See Fig. 11 for power wiring
connections to the unit load terminals and equipment
ground.
Provide a ground- - fault and short- - circuit over- - current
protection device (fuse or breaker) per local code (or in
absence of local code, is is recommended that U.S.A.
standard, NEC Article 440, be followed). Refer to unit
informative data plate
Over- - current Protection) device size.
All field wiring must comply with the appropriate national
electrical codes and local requirements.
COPPER
WIRE
A93033
for MOCP (Maximum
Units Without Disconnect Option
C1
11
Disconnect
L1
Units With Disconnect Option
L1
2
Optional
Disconnect
L2 4
L3
6
Disconnect factory test leads; discard.
Fig. 11 - - Power Wiring Connections
Affix the crankcase heater warning sticker to the unit
disconnect switch.
All Units —
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Table 8. 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 8, Note 5 (see
page 16) 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 — 38AUD unit control voltage is
24 v. See Fig. 18 and Fig. 19 for typical field control
connections and the unit's label diagram for field-supplied
wiring details. Route control wires to the 38AUD 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 (air handler or packaged fan coil). Fig. 12 depicts
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 38AUD 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).
14
TB1
13
L2 L3
1
Factory
3
Wiring
Switch
5
C10074