Refrigerant Piping Connection; Oil Traps - Mars Comfort-Aire Century VCD24 SA Series Installation Manual

REFRIGERANT PIPING CONNECTION

WARNING
All field piping must be completed by a licensed technician and must comply with the local and
national regulations.
• When the air conditioner is installed in a small room, measures must be taken to prevent the
refrigerant concentration in the room from exceeding the safety limit
in the event of refrigerant leakage. If the refrigerant leaks and its concentration exceeds its proper
limit, hazards due to lack of oxygen may result.
• When installing the refrigeration system, ensure that air, dust, moisture or foreign substances do not
enter the refrigerant circuit. Contamination in the system may cause poor operating capacity, high
pressure in the refrigeration cycle, explosion or injury.
• Ventilate the area immediately if there is refrigerant leakage during the installation. Leaked refrigerant
gas is both toxic and may be flammable. Ensure there is no refrigerant leakage after completing the
installation work
Notes on pipe length and elevation
The maximum length and drop
height based on models.(Unit:m/ft.)
Capacity MaxLength of
(Btu/h) piping
ft.
24k/30k 164
36k/48k/60k 213
Ensure that the length of the refrigerant pipe, the
number of bends, and the drop height between the
indoor and outdoor units meets the requirements
shown in the table next to it：
Name Shape
Φ6.35(1/4in)
Liquid
Φ9.52(3/8in)
side
Φ12.7(1/2in)
Connecting
pipe
Φ16(5/8in)
Gas
assembly
side
Φ19(3/4in)
Φ22(7/8in)
Maximum drop
height
m ft. m
50 82 25
65 98.4 30
Quantity(PC)
Parts you must
purchase separately.
Consult the dealer
about the proper
pipe size of the unit
you purchased.
Indoor unit/
Outdoor unit
17
Installation and Operation Manual - VCDxxSA
CAUTION

Oil traps

If oil flows back into the outdoor unit's
compressor, this might cause liquid
compression or deterioration of oil return.
Oil traps in the rising gas piping can
prevent this.
An oil trap should be installed every
6m(20ft) of vertical suction line riser
(＜36000Btu/h unit). An oil trap should be
installed every 10m(32.8ft) of vertical
suction line riser (≥36000Btu/h unit).
Gas piping
Oil trap
17
Indoor unit/
Outdoor unit
6m/20ft
(<36000Btu/h unit)
10m/32.8ft
Liquid piping
(≥36000Btu/h unit)
6m/20ft
(<36000Btu/h unit)
10m/32.8ft
(≥36000Btu/h unit)