Refrigerant Pipe; Air Evacuation; Leakage Test - Carrier 38QUS012 Installationshandbuch

4. REFRIGERANT PIPING WORK

4.3 REFRIGERANT PIPE

Liquid Side
Model
Φ6.35mm
38QUS012
Φ6.35mm
38QUS018
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)
Φ9.52mm 20
Φ12.7mm 25
Manifold valve
Compound gauge Pressure meter
-76 cmHg
Handle Hi
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)
8
5
10 5
Vacuum pump
D
C
B: High pressure stop valve
Additional charge
per meter (R410A)
15 g/m
15 g/m
GB-13 7