Refrigerant Pipe; Air Evacuation; Leakage Test - Carrier 42QTD024DS-Serie Installationshandbuch

4. REFRIGERANT PIPING WORK

4.3 REFRIGERANT PIPE

Model Liquid Side
38QUS024 Φ9.52mm
Φ9.52mm
38QUS036/48
Φ9.52mm
38QUS060
NOTE
When the pipe length is over 5m, the additional refrigerant should be added according to the piping length.

4.4 AIR EVACUATION

Connect the charge hose from the manifold gauge to the service port of the gas side packed valve.
Connect the charge hose to the port of the vacuum pump.
Fully open the handle Lo of manifold gauge.
Operate the vacuum pump to evacuate air from the system until 76cmHg.
Close the handle Lo of manifold gauge.
Fully open the valve stem of the packed valves.
Remove the charging hose form the service port.
Securely tighten caps of packed valve.

4.5 LEAKAGE TEST

After the piping work is finished, make sure to check the connection part of each refrigerant pipe and confirm that there is no gas leak by
applying soapy water to them or by using a leak detector specific for HFC refrigerants. Refer below picture for illustration.
Check-point of outdoor unit
Allowable
Gas Side
pipe length (m)
Φ15.88mm 25
Φ15.88mm 30
Φ15.88mm 30
Manifold valve
Compound gauge Pressure meter
-76 cmHg
Handle Lo
Charge hose
Charge hose
Packed valve
Check-point of indoor unit
B
A
A: Low pressure stop valve
C& D: Indoor unit flare nuts
Max. Height Charge less
difference (m) length (m)
10
15
20
Handle Hi
Vacuum pump
D
C
B: High pressure stop valve
Additional charge
per meter (R410A)
5 30 g/m
5 30 g/m
5 30 g/m
GB-13 7