Carrier 50TCM Series Installation, Operation And Maintenance Manual page 15

requirements. Route power lines through the corner post openings as shown in unit dimensional drawings. If a de-
energize via a unit disconnect switch is desired, connect the source leads to the unit power terminal block. Refer to
unit label diagram for additional information. Refer to unit label diagram for additional information. Field power wires
are connected to the unit power terminal block (see wiring diagram label for control box arrangement) max wire size is
#4 AWG (copper only).
NOTE: Check all factory and field electrical connections for tightness. Field--supplied wiring shall conform to the
limitations of 63°F (33°C) rise.
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.
Failure to follow this warning could result in intermittent operation or performance satisfaction. Do not connect aluminum wire
between disconnect and air conditioning unit. Use copper wire only (See Fig. 7)
When installing units, provide a disconnect switch per NEC (National Electric Code) of adequate size. 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.
All field wiring must comply with the NEC and all local codes. Size wire based on MCA (Minimum Circuit Amps) on the
unit informative plate, connections to the unit power terminal block and equipment ground. Maximum wire size is #4
ga AWG per pole.
Provide a ground-fault and short –circuit over-current protection device (fuse or breaker) per NEC Article 440 (or local
codes). Refer to unit informative data plate for MOCP (Maximum Over-current Protection) device size. All field wiring
must comply with NEC and local requirements.
1. Install power wiring conduit through side panel openings. Install conduit between disconnect and control box.
2. Install power lines to terminal block connections.
Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate. On 3 –
phase units, voltages between phases must be balanced within 2% and the current within 10%. Use the formula
shown in the legend of the Electrical Data Table to determine the percent of voltage imbalance. Operation on improper
lines voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such
operation would invalidate any applicable Carrier warranty.
ELECTRIC SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
FIRE HAZARD
Fig. 7 Disconnect Switch and Unit
WARNING
WARNING
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