WT05221X02
4. Insulation Cover Installation
Install the insulation cover on the twinning kit after brazing the pipes and twinning kit.
Insulate all refrigerant pipes. Insulate the high-pressure and low-pressure pipes separately, and pipes located inside the unit as well as
the outside. Use heat-resistant insulation material (Heat resistant : at least 120˚C [248˚F], Thickness: high-pressure = 10 mm [13/32 in],
low-pressure = 20 mm [13/16 in] ). Position the edges of the insulation cover and heat-resistant insulation material so as not to leave a
gap, and then wrap the exterior perimeter of the pipe joints and middle with tape (field-supplied).
Downward slope
To BC controller
High-pressure twinning pipe
100mm [4 in]
or more
A
B
Upward slope
To BC controller
Total pipe length = A + B < 5m [16-7/16 ft]
Tape (field-supplied)
Overlap margin of the tape
Insulation cover
Heat-resistant insulation material (field-supplied)
Insulation covers can shrink.
Overlap the tape as shown in the left
figure so that there will be no gap in
between the insulation cover or
field-installed insulation material.
field-supplied pipe
Heat-resistant insulation material (field-supplied)
Heat-resistant insulation material (field-supplied)
field-supplied pipe
field-supplied pipe
2
High-pressure
twinning pipe
L
Insulation cover
Tape (field-supplied)
To be gap free
To be gap free
4
See reverse.
3. Pipe Connection Example
Connect the pipes between outdoor units,
using the figure below as a reference.
Main low-pressure pipe (field-supplied)
Main high-pressure pipe (field-supplied)
2
High-pressure twinning pipe
Low-pressure connecting pipe
(field-supplied)
High-pressure connecting pipe
(field-supplied)
1
Low-pressure twinning kit
· If high-pressure twinning pipe is installed above the base of the
outdoor unit, it should be no more than 200mm [7-7/8 in].
Outdoor unit 2
Outdoor unit 1
High-pressure
twinning pipe
200mm max.
To indoor unit
5. Miscellaneous Notes
Secure the field-supplied pipes with a pipe cover and a cable tie in place to keep them from coming in contact with other pipes as
necessary.
(7) Pipe connection (high-pressure side)
Make sure pipes from the twinning pipe to the outdoor unit are sloped downwards.
(6) The length of the straight pipe between indoor units and the twinning pipe (high-pressure pipe)
Use the pipes supplied in the twinning kit, and make sure the section of the field-supplied pipe that connects to the twinning
pipe has at least 500 mm [19-11/16 in] of straight section. (The section of the field-supplied pipe that connects to the twinning
pipe must have at least 500 mm [19-11/16 in] of straight section.) If the straight section is less than 500 mm [19-11/16 in],
it may result in equipment damage.
