McQuay MWM09J Manual page 17

Application Information
Wiring
Electrical Connections
• Wiring regulations on wire diameters differ from country to country. Please refer to your LOCAL
ELECTRICAL CODES for fi eld wiring rules. Be sure that installations comply with the 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 disconnects 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 fi rmly connected.
• All wiring must not touch the hot refrigerant piping, compressor or any moving parts of fan motors.
Refrigerant Piping
Piping Length and Elevation
When the pipe length becomes too long, both the capacity and reliability drop. As the number of bends increases,
system piping resistance to the refrigerant fl ow increases, thus lowering the cooling capacity, and as the result
the compressor may become defective. Always choose the shortest path and follow the recommendation as
tabulated below:
Indoor
Model
Outdoor
Min. Allowable Length, m (L)
Max. Allowable Length, m (L)
Max. Allowable Height, m (H)
Liquid, mm/in
Suction, mm/in
* Be sure to add the proper amount of additional refrigerant. Failure to do so may result in reduced performance
Remark: The refrigerant pre-charged in the outdoor unit is for piping length up to 7.6m/25ft.
15
Indoor Unit
Outdoor Unit
MWM09J/JR MWM15J/JR
M5WM10J/JR M5WM15J/JR
MLC09C/CR MLC15C/CR
M5LC10C/CR M5LC15C/CR
3
12
5
6.35 / 1/4 6.35 / 1/4
9.52 / 3/8 12.70 / 1/2
L H
MWM20J/JR
M5WM20J/JR
MLC20C/CR
M5LC20C/CR
3 3
12 15
5 8
6.35 / 1/4
15.87 / 5/8
MWM-J_(ii)
MWM25J/JR
M5WM25J/JR
MLC25C/CR
M5LC25C/CR
3
15
8
9.52 / 3/8
15.87 / 5/8