Trane 4TXK6512G1000AA Service Manual page 137

Preventing foreign objects from entering
 Be careful not to let the indoor and outdoor piping come into contact with the compressor terminal cover .
If the liquid-side piping insulation might come into contact with it, adjust the height as shown in the figure below .
Also, make sure the field piping does not touch the bolts or outer panels of the compressor .
 When the outdoor unit is installed above the indoor unit the following can occur:
The condensed water on the stop valve can move to the indoor unit . To avoid this, please cover the stop valve with
sealing material .
 If the temperature is higher than 30°C and the humidity is higher than RH 80%, then thickness of the sealing
materials should be at least 20mm in ouder to avoid condensation on the surface of the sealing .
 Be sure to insulate the liquid and gas-side field piping .
Any exposed piping may cause condensation.
(The highest temperature that the gas-side piping can reach is around 120°C, so be sure to use insulating
material which is very resistant .)
No not touch piping and internal parts.
Cautions for necessity of a trap
To avoid the the risk of oil held inside the riser piping flowing back into the compressor when stopped and causing
liquid compression phenomenon, or cases of deterioration of oil return, it will be necessary to provide a trap at
each difference in height of 10m in the riser gas piping .
 A trap is not necessary when the outdoor unit is installed at higher position than the indoor unit .
Leak test and vacuum drying
When all piping work is complete and the outdoor unit is connected to the indoor unit, it is necessary to :
 check for any leakages in the refrigerant piping
 to perform vacuum drying to remove all moisture in the refrigerant piping .
If there is a possibility of moisture being present in the refrigerant piping (for example, rainwater may have entered
the piping), first carry out the vacuum drying procedure below until all moisture has been removed .
General guidelines
 All piping inside the unit has been factory tested for leaks .
 Use a 2-stage vacuum pump with a non-return valve which can evacuate to a gauge pressure of-100 .7kPa(5
Torr absolute,-755mm Hg) .
 Connect the vacuum pump to both the service port of the gas stop valve and the liquid stop valve
to increase efficiency .
pump to evacuate the installation. No additional refrigerant is provided for air purging. Make sure that the gas stop
valve and liquid stop valve are firmly closed before performing the leak test or vacuum drying.
Notice
Danger
Notice
Do not purge the air with refrigerants. Use a vacuum
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