(3) REFRIGERANT PIPING
MAXIMUM PIPE LENGTH AND MAXIMUM NUMBER OF BENDS
• 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 flow increases, thus lowering the cooling capacity, and as the result the
font compressor may become defective. Always choose the shortest path and follow the recommendation
as tabulated below:
MODEL
DATA
20 25/30B 30C 35/40 50 60/61/62
Max. Length, L 15m 15m 35m 35m 35m 35m
Max. Elevation, H 8m 8m 15m 15m 15m 20m
Max. No. of bends 10 10 10 10 10 10
PIPING SIZES (FLARE CONNECTION TYPE)
Piping sizes are as follows:
MODEL 20 25/30B 30C 35/40 50 60/61/62
Liquid (mm/in) 6.35(1/4) 9.52(3/8) 9.52(3/8) 9.52(3/8) 9.52(3/8) 12.7(1/2)
Suction (mm/in) 15.88(5/8) 15.88 (5/8) 15.88 (5/8) 19.05 (3/4) 19.05 (3/4) 19.05(3/4)
PIPING CONNECTION TO THE UNITS
• Align the center of the piping and sufficiently tighten the flare nut with fingers.
• Finally, tighten the flare nut with torque wrench until the wrench clicks.
• When tightening the flare nut with torque wrench, ensure the direction for tightening follows the arrow on the wrench.
PIPE SIZE (mm/in) TORQUE (Nm)
6.35(1/4) 18
9.53(3/8) 42
12.7(1/2) 55
15.88(5/8) 65
19.05(3/4) 78
(4) 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.
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