Refrigeration Piping Work; Refrigeration Piping Work Procedures; Caution In Connecting Pipes; Specification Of Connection Pipe - Gree FGR20/BNa-M Service Manual

3 REFRIGERATION PIPING WORK

3.1 Refrigeration Piping Work Procedures

1). Align the flared end of the copper pipe with the center of the thread joint. Manually tighten the flared
end nut.
2). Use torque spanner to tighten the flared end nut until the spanner clatters.
Fitting Pipe for
Indoor unit
Spanner

3.2 Caution in Connecting Pipes

Note: Do not loosen the cap of the pipes when connecting the pipes between the indoor unit
and the outdoor unit. Connecting the pipes as soon as possible after loosening the cap of the pipes
to avoid the entering of water and dust. A metal pipe should be utilized if a pipe should be installed
through a wall.
1). The connection of the pipes should confirm to the following principles:
2). Make sure to lessen the length of connecting pipe, the height difference between the
indoor and outdoor unit, and the number of bends, and enlarge the diameter of bends.
Height difference between the indoor and outdoor unit
The pipe meld type could be employed for the connection of the pipes between the indoor and outdoor
units.
The pipe joint should be tightly connected when a pipe joint is employed between two pipes. It is better to
use only one connecting pipe if the distance is not far.
The pipes should not be shriveled when the pipes are connecting. The bend diameter should be longer
than 200 millimeter. The connecting pipes should not be extended or curved frequently and the curving process
should not be larger than 3 times in the same bending position.

3.3 Specification of Connection Pipe

External Diameter
Model
Gas Pipe
(Inch)
FG20/BNa-M
3/4"
FGR20/BNa-M
FG25/CNa-M
1"
FGR25/CNa-M
FG30/BNa-M
9/8"
FGR30/BNa-M
FG40/BNa-M
9/8"
FGR40/BNa-M
Flaring Nuts
Fitting Pipe
Torque Spanner
The permitted maximum value of each case
0
90 Number of bends
Length of connecting pipes
Maximum Length
of Connection Pipe
Liquid Pipe
(m)
(Inch)
3/8"
50
3/8"
50
1/2"
50
5/8"
50
Duct Type Split Air Conditioner
Maximum Difference in
Max.No. of
Height between Outdoor
elbows. (90
and Indoor Unit (m)
30
30
30
30
Service Manual
＜ 30m
＜ 12
＜ 50m
Additional
Charge of
o
)
Refrigerant (g/m)
12 60
12 60
12 120
12 170
47