McQuay MCC 010C/CR Manual page 57

Wiring Electrical Connections
• Wiring regulations on wire diameters differ from country to country. Please refer to your LOCAL
ELECTRICAL CODES for field wiring rules. Be sure that installation comply with such rules and regulations.
General Precautions
• Ensure that the rated voltage of the unit corresponds to the name plate before carrying out proper wiring
according to the wiring diagram.
• Provide a power outlet to be used exclusively for each unit. A power supply disconnect and a circuit
breaker for over-current protection should be provided in the exclusive line.
• The unit must be GROUNDED to prevent possible hazards due to insulation failures.
• All wiring must be firmly connected.
• All wiring must not touch the hot refrigerant piping, compressor or any moving parts of fan motors.
Vacuuming and charging
• The precharged outdoor unit does not need any vacuuming or charging. However once it is connected,
the connecting pipe line and the indoor need to be vacuumed before releasing the R22/R407C from the
outdoor unit.
1) Open the service port core cap.
2) Connect pressure gauge to the service port.
3) Connect the line to vacuum pump. Open the charging manifold valve and turn the pump on. Vacuum
to –0.1 MPa (-760mmHg) or lower. (Evacuation time varies by the pump but averagely in 1 hour).
4) After evacuation, unscrew the spindle (diagram 2B) for the gas to run to indoor unit.
CAUTION FOR R407C
R407C must be charged as
liquid. Usually R407C cylinder
is equipped with a dip-pipe for
liquid withdrawal. If there is no
dip-pipe, the cylinder should
be inverted so as to withdraw
liquid R407C from the valve.
Diagram 1
Diagram 2
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