All Units — Voltage to compressor terminals during operation must be within voltage range indicated on unit
nameplate. See Electrical Data Table. 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 Electrical Data Table 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 — 38AUM unit control voltage is 24 v. See Typical Wiring Schematic for typical field control
connections and the unit’s label diagram for field-supplied wiring details. Route control wires to the 38AUM 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: - Typical Remote Thermostat Connection depict typical connections to a Carrier 40RUM 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 38AUM 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).
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.
The 38AUMZ is a single-circuit, two-stage cooling unit. Select a two—stage cooling thermostat, with or without
supplemental heating as needed.
Fig: - Typical Remote Thermostat Connections — 38AUMZ
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