P13 OF 32
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World !
INSTALLATION OF REFRIGERANT PIPES
DIMENSIONS
OF CONNECTING PIPES
Items
Gas Pipe (inch)
Liquid Pipe(inch)
9000, 12000
3/8
1/4
18000
1/2
1/4
Capacity of indoor unit(Btu/h)
21000, 24000
5/8
Connecting to Indoor unit (I.D)
5/8
1/4
BU module
Connecting to Outdoor unit (I.D)
3/4
3/8
Outdoor unit
Between outdoor unit and the 1st branch
The pipe L1
Between the 1st and the 2nd branch
The pipe L2
WMMS-80CH-V2B(59)2
WMMS-90CH-V2B(59)2
CONNECTION OF BRANCH PIPES
If two or three BU modules used, Y-type branch pipe of
will be chosen
(59)2S-00-BranchY
(59)2S-00-BranchY-L1
(59)2S-00-BranchY-G1
Y-type branch pipe is equipped with auxiliary tubes to adjust the diameter of different pipes. If the dimension
of the pipe selected is different from the dimension of branch pipe joint, Cut the copper tube in the middle
with tube cutter and clear up burrs. Please do that as following figure.
Length (Ft.)
≤
180
≤
262
≤
295
≤
49
≤
131
≤
98
≤
98
≤
49
≤
49
≥
16
as possible as short
H1
H2
H3
H4
L1
L1+L2+L3+L4+L5
1A+1B+1C+2A+2B+2C+3A+3B
1A;1B;1C;2A;2B;2C;3A;3B
L4+1B;L2+L5+2A; L2+L3+3B
L3;L4;L5
The pipes
Between BU and the branch
Between outdoor and the 1st branch
Between indoor and indoor units
Between BU and BU modules
Between outdoor units and BU
Between outdoor and indoor units
Between indoor unit and the 1st branch
Between indoor unit and BU module
Between
unit and BU
indoor
WMMS-80CH-V2B(59)2
WMMS-90CH-V2B(59)
2
Between outdoor unit and BU
Items
Maximum allowable length
Maximum allowable length
Minimum allowable length
3/8
3/8
3/8
3/8
3/8
5/8
5/8
3/4
5/8
INST
ALLER'S
INSTRUCTION
Inlet
Outlet
Cut the middle
Cut the middle
Inlet
Outlet
Cut the middle
Cut the middle
Cut the middle
P14 OF 32
YMGI, Engineered Comfort Products for A Sustainable and Efficient Green World !
INSTALLATION OF REFRIGERANT PIPES
Y-type branch pipe must be installed in vertical or horizontal direction. In the inlet of the branch pipe, keep
at least 19.69inch straight pipe.
1) Pipe connections should be follow the following
rules:
* Outdoor unit shall be installed close to the indoor
unit, hence to minimize the length and bends of
connection pipes.
* The gap of outdoor unit and indoor units should be
as small as possible.
* The bending diameter of the pipeline is better as
large as possible.
PRECAUTION FOR CONNECTION
2) The brazing operation must be strictly in
accordance with the process requirements. During
the installation, do not damage the pipeline and
the bending diameter must be greater than 200mm.
3) The connection pipe cannot often be bent or
straightened. Otherwise it will harden.
4) The elbow operation must use the elbow.
Otherwise, the pipe may be cracking.
5) The process of flaring
* Using the tube cutter cutting the connecting pipe in
the middle and remove the burrs.
* Install the nut before the flaring operation.
* Check the flared portion, whether there is fractured
or not.
6) The following table for the torque required to
tighten the nuts.
Pipe diameter(inch) Wall thickness(inch) Tightening torque(N.m)
0.25
≥
0.02
15~30
0.375
≥
0.03
30~40
0.5
≥
0.04
45~50
0.625
≥
0.04
60~65
0.75
≥
0.04
70~75
7) Align the flared end of copper tube with the center
of pipe joint. Tighten the nuts with hands.
8) Tighten the flaring nuts with torque wrench until
you hear a "click".
9) After all the refrigerant installation has been done,
use nitrogen to carry out gas leak check.
* During the connection of the indoor unit or BU
module to the refrigerant pipe, never pull any joints
of the indoor unit or the BU module by force;
otherwise the capillary pipe or other pipe may crack,
which then would result in leakage.
* The refrigerant pipe should be supported by
brackets, that is, don't let the unit withstand the
weight of it.
* For the Super Free Match system, each pipe should
be labeled to tell which system it belongs to avoid
mistaken inaccurate piping.
INST
ALLER'S
INSTRUCTION
Within ±
30
℃
Within ±
30
℃
