Vacuum Dry Procedure; Vacuum Destroy For The Second Time - Toyotomi DCT 100HSPi Service Manual

2.2. Vacuum dry procedure

There are two methods of vacuum dry due to different construction environment: common vacuum dry,
special vacuum dry.
. Common vacuum dry procedure
Vacuum dry (for the first time)---connect the all-purpose detector to the inlet of liquid pipe and gas pipe,
and run the vacuum pump more than two hours (the vacuum pump should be below -755mmHg)
exist in the pipe. At this time, it should be pumped 1 hour more.
points.
Vacuum placement test: place 1 hour when it achieves -755mmHg, pass if the vacuum watch shows no
rising. If it rises, it shows
Vacuuming from liquid pipe and gas pipe at the same time.
Sketch map of common vacuum dry procedure.
Special vacuum dry procedure
This vacuum dry method is used in the following conditions:
Rainwater may enter into the pipe.
Vacuum dry for the first time ······ 2h pumping
. Vacuum destroy for the second time ······ Fill nitrogen to 0.5Kgf/cm2
Because nitrogen is for drying gas, it has vacuum drying effect during vacuum destroy. But if the
Installation
-755mmHg after pumping 2 hours, moisture or leakage point will still
-755mmHg after pumping 3 hours, please check if there are some leakage
shing the refrigerant pipe.
Installation