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2.7 – Trap Condensate Drain
See Fig. 5, Fig.1 and Fig. 2 for drain pipe location. Trap should be deep enough to offset the maximum unit static
difference. Fig. 5 shows the recommended trap sizing.
2.8 – Outdoor Air-Vent
All units have a manual outdoor side vent to provide ventilation air. Side vents can admit up to 10% outdoor air into
indoor air section return-air compartment.
2.9 – Make Electrical Connections
FIELD POWER SUPPLY – Unit is factory wired for voltage shown on nameplate.
When installing units, provide disconnect as per NEC (National Electrical Code) requirements, of adequate size. All
field wiring must comply with NEC and local requirements. Route power lines through the corner post openings as
shown in Fig. 1 and Fig. 2.
Operating voltage to compressor must be within voltage range indicated on unit nameplate. On 3-phase units,
voltages between phases must be balanced within 2% and the current must be balanced within 10%.
The correct power phasing is critical in the operation of the scroll compressors. An incorrect phasing will cause the compressor
to rotate in the wrong direction. This may lead to premature compressors failure.
Do not use gas piping as an electrical ground. Unit cabinet must have an uninterrupted, unbroken electrical ground to minimize
the possibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire connected to unit
ground lug in control compartment, or conduit approved for electrical ground when installed in accordance with local electrical
codes or in absence of local codes, it is recommended that U.S.A standard ANSI/NFPA 70, National Electrical Code be followed.
FIELD CONTROL WIRING – Install a Carrier approved accessory thermostat assembly according to the installation
instructions included with the accessory. Locate thermostat assembly on a solid wall in the conditioned space to sense
average temperature. Route thermostat cable or equivalent single leads of no. 18 AWG (American Wire Gage)
colored wire from sub-base terminals through conduit in unit to low-voltage connection. Settings may be changed
slightly to provide a greater degree of comfort for a particular installation.
For wire runs up to 50 ft, use no. 18 AWG insulated wire. For 50 to 75 ft, use no. 16 AWG insulated wire. For over 75 ft, use no.
14 AWG insulated wire. All wire larger than no. 18 AWG cannot be directly connected to the thermostat and will require a
junction box and splice at the thermostat.
Fig. 5 Condensate Drain Details
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
ELECTRIC SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
CAUTION
WARNING
NOTE
IMPORTANT
Page 10
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