GB-26
4. REFRIGERANT PIPING WORK
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.
: Low pressure stop valve
: High pressure stop valve
: Indoor unit flare nuts
: Piping adaptor of 18K indoor
Check-point of indoor unit
Check-point of outdoor unit
4.3 REFRIGERANT PIPE
Gas Side
Model
Ø
6.35mm×2
Ø
9.52mm×2
10
Liquid Side
Total Allowable
pipe length (m)
Max. Height
difference (m)
Charge less
length (m)
Additional charge
(R410A)
18
27
36
Ø
6.35mm×3
Ø
9.52mm×3
10
10
10
30
45
60
20
25
30
10
10
(Total piping length -
chargeless length)
×15 g/m
NOTE
When the pipe length is longer than charge less
length, 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.
Repeat above steps for each system (indoors)
Fully open the valve stem of the packed valves.
Remove the charging hose form the service port.
Securely tighten caps of packed valve.
-76 cmHg
Handle Lo
Handle Hi
Charge hose
Charge hose
Vacuum pump
Packed valve
Manifold valve
Compound gauge
Pressure meter
4.5 LEAKAGE TEST
Ø
6.35mm×4
Ø
9.52mm×4
Allowable pipe
length for each
indoor(m)
OU higher
than IU
IU higher
than OU
10
15
15
15
Max. Height
difference of
indoors (m)
20
15
Gas Side
Model
(indoor)
Ø
6.35mm
Ø
9.52mm
Liquid Side
09/12
18
Ø
6.35mm
Ø
12.7mm
Install Piping adapter (from
Ø
12.7 to
Ø
9.52)
at outdoor side for 18K indoor
Note
Make sure that the indoor unit (A, B,...)
connects to the valves and signal wire
terminal (A, B, ...) of outdoor unit as
identified with their respective matched
connection.
CAUTION
3
1
5
2
4
1
3
5
2
4