Carrier CDII-184R1-0CTR4 Installation & Operation Manual page 28

Hot gas bypass lines should be insulated, especially if the runs are long or if the piping is
exposed to cold temperatures.
7.8 CONDENSATE DRAIN PIPING
Install condensate drainpipe, with a U-trap of minimum height 50mm at its end, in the Indoor
unit. The pipe should be rigid PVC and of 19 mm inside diameter. Pictures below are for
reference only.
CORRECT
The pipe should slope downwards with slope 1:100. There should not be unnecessary bends
or kinking in the connection pipes.
Horizontal T-joints in the pipe are not permitted, prefer vertical T-joints. Keep the pipe length
maximum.
Insulate the condensate drainpipe, especially the portion within the room, with PE foam of
thickness 6 mm.
7.9 VACUUMING / EVACUATION
WARNING
• Do not use a manometer or apply power to the compressor while it is under vacuum, this
may cause motor winding damage.
• Never run the compressor under vacuum as it may cause compressor motor burnout.
(You are requested to use Electronic Vacuum Gauge).
Vacuum pump down and dehydration procedure
Moisture obstructs proper functioning of compressor and refrigeration system. Air and moisture
reduce service life and increase condensing pressure. They also cause excessively high
discharge pressure and temperature, which can destroy lubricating properties of oil. Air and
moisture also increase risk of acid formation, giving rise to copper plating and motor insulation
damage. All these phenomena can cause mechanical and electrical compressor failure. To
eliminate these factors, a vacuum pump down according to procedure below is recommended.
PROCEDURE
It is essential to vacuum the interconnecting pipes both liquid and suction.
WRONG
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WRONG