Refrigerant Pipe; Air Evacuation; Leakage Test - Carrier 42QZA009DS Series Installation Manual

4. REFRIGERANT PIPING WORK

4.3 REFRIGERANT PIPE

Model
Liquid Side Gas Side
(38QUS)
Φ6.35mm Φ9.52mm
009/012
Φ6.35mm Φ12.7mm
018
NOTE: 1) Please use tools for R410A/R32 system respectively;
2) 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 from 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
A: Low pressure stop valve
C& D: Indoor unit flare nuts
Allowable Max. Height
pipe length (m) difference (m)
25
30
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
Charge less
length (m) per meter (R410A/R32)
10 5
20 5
Vacuum pump
D
C
B: High pressure stop valve
Additional charge
15/12 g/m
15/12 g/m
GB-12