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(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.
(7) Pipe connection (high-pressure side)
· Make sure the pipes from the twinning pipe to the outdoor unit are sloped downwards.
100 mm
A
[3-15/16 in]
Downward slope
or more
High-pressure twinning pipe
Total pipe length = A + B < 5 m [16-7/16 ft]
· If high-pressure twinning pipe is installed above the base of
the outdoor unit, it should be no more than 200 mm [7-7/8 in].
3. Pipe Connection Example
Connect the pipes between outdoor units, referencing
the figure below.
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).
field-supplied pipe
field-supplied pipe
2 High-pressure
twinning pipe
field-supplied pipe
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.
B
To BC controller
Upward slope
1 Low-pressure twinning kit
Low-pressure connecting pipe
(field-supplied)
High-pressure connecting pipe
(field-supplied)
Heat-resistant insulation material (field-supplied)
To be gap free
h Insulation cover
Heat-resistant insulation material (field-supplied)
Insulation cover
Overlap margin of the tape
Outdoor unit 1
To BC controller
200 mm
[7-7/8 in]
max.
2 High-pressure twinning pipe
Main high-pressure pipe (field-supplied)
To be gap free
Heat-resistant insulation material (field-supplied)
Tape (field-supplied)
4
Outdoor unit 2
High-pressure
twinning pipe
To
BC controller
Main low-pressure pipe (field-supplied)
Tape (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.
WT07686X01
See reverse.
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