34
Unit on
Cooling
Wait about
3 minutes
3
3
1
2
CONNECTING REFRIGERANT PIPING LINES (Cont.)
15-13 REFRIGERANT LEAK CHECK
After connecting the refrigerant piping lines, with both
outdoor and indoor units check the joints for leakage with
electronic leak detector or soapy water.
15-14 INSULATING REFRIGERANT PIPING LINES
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.
The thickness of the insulation should be a minimum of 9 mm.
The insulation you select must have good insulation
characteristic, be easy to use, resist age and not easily absorb
moisture.
Finally wrap the flare couplings and pipes with insulation and
tighten this with tape without exerting too much pressure on
the insulation.
CAUTION:
•
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.
•
Repair and cover any possible cracks in the insulation
•
Avoid dripping due to insufficient insulation of piping.
15-15 PUMP DOWN
Pump down means collecting all the refrigerant in the system
back into the outdoor unit. Pump down must be actuated
before disconnection of pipes, to avoid loss of refrigerant gas.
Pump down is used when the unit is moved to another
installation location or when the system is repaired.
PUMP DOWN PROCEDURE :
1. Close the liquid valve with the Allen wrench.
2. Turn the system ON in cooling mode with fan
operating at high speed.
Then the refrigerant will be collected into the outdoor unit.
(Compressor will immediately start, provided 3
minutes have elapsed since the last stop).
3- After 3 minutes of operation, close the suction valve
with the Allen wrench.
Turn the system off and switch mains supply OFF.
Disconnect refrigerant piping lines.
After disconnection, protect valves and piping ends
from dust.
Pipe
Insulation
Pipe
Fastening tape
Summary of Contents for 42QG18-C
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