Pipe Insulation; Charging Refrigerant - Daikin CMSQ200A7W1B Service Manual

Test Operation
2. Following should be executed if there is a possibility of moisture remaining inside the pipe (if

1.2.4 Pipe Insulation

After finishing the leak test and vacuum drying, the piping must be insulated. Take into account
the following points:
Be sure to insulate local pipes, as touching them can cause burns.

1.2.5 Charging Refrigerant

The outdoor unit is factory charged, but depending on the length of the piping when installed,
the outdoor unit may require additional charging.
For charging the additional refrigerant follow the procedure as described in this chapter.
Refrigerant can not be charged until all field wiring and field piping has been completed.
Refrigerant may only be charged after performing the leak test and the vacuum drying.
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piping work is carried out during the raining season or over a long period of time, rainwater
may enter the pipe during work).
After evacuating the system for 2 hours, pressurize the system to 0.05 MPa (vacuum break)
with nitrogen gas and evacuate the system again using the vacuum pump for 1 hour to
–100.7 kPa (vacuum drying). If the system can not be evacuated to –100.7 kPa within 2
hours, repeat the operation of vacuum break and vacuum drying.
Then, after leaving the system in vacuum for 1 hour, confirm that the vacuum gauge does
not rise.
Make sure to insulate the connection piping and refrigerant branch kits entirely.
Be sure to insulate liquid and gas piping (for all units).
Use heat resistant polyethylene foam which can withstand a temperature of 70°C for liquid
side piping and polyethylene foam which can withstand a temperature of 120°C for gas side
piping.
Reinforce the insulation on the refrigerant piping according to the installation environment.
Ambient temperature
≤30°C
>30°C
Condensation might form on the surface of the insulation.
If there is a possibility that condensation on the stop valve might drip down into the indoor
unit through gaps in the insulation and piping because the outdoor unit is located higher than
the indoor unit this must be prevented by sealing up the connections. See figure 10.
Gas line stop valve
Sealing up treatment
Insulation
Indoor -outdoor interconnection piping
Indoor -outdoor interconnection piping
Humidity
75% to 80% RH
≥80 RH
Liquid line stop valve
Service port for adding refrigerant
Sealing up treatment
Insulation
fig. 10
SiBE28-805
Minimum thickness
15 mm
20 mm
Test Operation