Refrigerant Piping - McQuay SB250B Installation Manual

Installation Clearance
Outdoor unit must be installed such that there is no short circuit of the discharge air or obstruction to smooth air flow.
Minimum distance (mm)
30/40/50
60/75
100/125/150
Maximum Pipe Length And Maximum No. Of Bends
When the pipe length becomes too long, both the capacity and reliability will drop and as the no. of bends increases, system
piping resistance to the refrigerant flow increases, thus lowering the capacity. As a result the compressor may fail. Always
choose the shortest path and follow the recommendations as tabulated below:-
Model
Max. Length
Max. Elevation
Max. no. of Bends
Bending must be carefully made so as not to crush the pipe. Use a pipe bender to bend a pipe where possible.
Our guarantee on the performance of our air-conditioners is strictly revoked if the height, length and/or no. of bends
Remark: For cooling unit SB60~SB75 & SB100~SB150, recommended to add 6 kg & 10 kg external accumulator
respectively.
Special Precautions When Mounting TXV Bulb
• TXV bulb should be clamped to the suction line near the evaporator outlet, and if possible, on a horizontal run.
• Clean suction line completely before clamping the bulb in place.
• Clamp the bulb to a free draining suction line.
• Insulate the remote bulb from ambient.
Note: After installation is done, the TXV bulb must be fixed at suction line at 8 o'clock or 4 o'clock.
Figure – TXV bulb placement in relation to suction line size
TXV Bulb on small Suction Line

REFRIGERANT PIPING

SL30C/CR SL40C/CR
35m 35m
10m 10m
10 10
! Caution
of the refrigerant piping system installed is beyond the limit above.
A
300 1000
300 1200
300 1000
SL50C/CR
35m
10m
10
TXV Bulb on large Suction Line
1-4
Air Discharge Space
B
1500
MSS60C/CR MSS75C/CR
SL60C/CR 100B/BR/125B/BR
35m
20m
10
C
300
500
150C
35m
20m
10