23
C09022
Fig. 17 -- Weatherproof Cover Installation
All Units —
Voltage to compressor terminals during operation must be
within voltage range indicated on unit nameplate. See
Table 11. On 3-phase unit s, vol tages betwe en phases must
be bal anced within 2% a nd the current within 10%. Use
the formula shown in the legend for Table 11, Note 5 (see
page 25) to determine the percent of voltage imbalance.
Operati on on improper line volt age or excessive phase
imbalance constitutes abuse and may cause damage to
electrical components. Such operation would invalidate
any applicable Carrier warranty.
Field Control Wiring —
38AU unit control voltage is 24 v. See Fig. 30 (38AUZ)
and Fig. 31 (38AUD) for typical field control connections
and the unit’s label diagram for field-supplie d wiring
deta ils. Route control wires to the 38AU uni t through the
opening in unit’s end panel to the connections terminal
board in the unit’s control box.
Rema inder of the system control s connecti on will vary
according to t he specific construction details of the i ndoor
section (air handler or packaged fan coil). Fig. 18
(38AUZ) and Fig. 19 (38AUD) depict typical connections
to a Carrier 40RU fan coil unit. Plan for field connections
carefully and install control wiring correctly per the
projec t plan. Additional components and supplemental
transformer accessory may be required.
The 38AU unit requires a n 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).
Thermostat —
Install a Carrier-approved accessory thermostat according
to installation instructions included with the accessory.
Locate the thermostat accessory on a solid wall in the
conditioned space to sense average temperature in
accordance with the thermostat installation instructions.
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
(Note 1)
(Note 2)
(Note 3)
(Note 3)
C10402
Fig. 18 -- Typical Remote Thermostat Connections
— 38AUZ
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
(Note 1)
(Note 2)
(Note 3)
(Note 3)
C10078
Fig. 19 -- Typical Remote Thermostat Connections
— 38AUD
38AU
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