CONNECTING REFRIGERANT PIPING LINES
18.15 REFRIGERANT LEAK CHECK
After connecting the refrigerant piping lines with both outdoor and
indoor units check the joints for refrigerant leak by using one of the
following methods :-
(1) Soapy water method
Apply soapy water or a liquid detergent on, the indoor unit
connections or outdoor unit connections by a soft brush to check
for refrigerant leakage of the connecting points of the piping.
If bubbles come out, the pipes have leakage and must be
repaired.
(2) Refrigerant leak electronic detector method.
Avoid disconnecting refrigerant piping connections
after they have been tightened to avoid refrigerant leaks.
18.16 INSULATING REFRIGERANT PIPING LINES
x To conserve energy and prevent wet floors due to condensation, the
suction and liquid piping lines must be well insulated with a proper
insulation material.
x
The thickness of the insulation should be a minimum of 12.7 mm.
x
Tape and suspend the refrigerant piping lines as shown.
Do not allow tube metal – to – metal contact
x
Care must also be taken to isolate the refrigerant piping lines to
minimize sound transmission from the system to the structure.
x
The insulation you select must have good insulation characteristic,
be easy to use, resist age and not easily absorb moisture.
x
Finally wrap the pipes and pipes joints with insulation and tighten
this with tape without exerting too much pressure on the insulation.
CAUTION:
x After a pipe has been insulated, never try to bend it into
a narrow curve, as this way will cause the pipe to break
or crack.
x Repair and cover any possible cracks in the insulation
x Avoid dripping due to insufficient insulation of piping.
Tubing Hanger
18.17 RELEASING REFRIGERANT CHARGE ON TO THE SYSTEM.
x Open both the suction and liquid valves by removing the plunger cap and with a hex wrench
back out counter-clockwise until valve stem just touches the chamfered retaining wall.
Replace plunger cap finger tight, then tighten an additional 1/12 turn (1/2 hex flat). Cap must
be replaced to prevent leaks.
WARNING :-
Never attempt to repair any brazed connections while the system is under pressure.
Personal injury could result.
Check-point of outdoor unit
Check-point of indoor unit
Sheet Metal Hanger
Insulated Vapor Line
To Next Page
Loading...
