3
(2) Connecting the twinning pipe kit
(1) Braze the high-pressure pipe (
6
) to the refrigerant
service valve.
(2) Screw down the low-pressure twinning pipe kit (
1
) to
the sheet metal of the refrigerant service valve with the
screws (
3
), and braze it to the refrigerant service valve.
(3) Braze the elbow (
5
) to the field-piping first, and then
braze it to the low-pressure twinning pipe kit (
1
).
(4) Braze the elbow (
4
) to the low-pressure pipe in the
middle.
Note
1. Exercise caution not to burn the cables while brazing the
pipes.
2. Before brazing pipes to the refrigerant service valve, place
a wet towel on the valve to keep its temperature from rising
above 120°C [248°F].
(5) Wrap the u-bend of the low-pressure twinning pipe kit (
1
)
with the pipe cover (
7
), and tie a band (
c
) around it to
keep it in place.
(6) Pipe connection (high-pressure side)
· Make sure the pipes from the twinning pipe to the heat source unit are sloped downwards.
· To prevent the refrigerant service valve from being damaged, do
not let its temperature rise above 120°C [248°F].
Place a wet towel on the refrigerant service valve before brazing
the pipes.
· Direct the blazing torch flame away from the adjacent cables
and sheet metal to keep them from being damaged.
CAUTION
3. Pipe Connection Example
Connect the pipes between heat source units,
referencing the figure below.
1
Low-pressure
twinning kit
d
ID22.2 [7/8]
-ID25.4 [1]
2
High-pressure twinning pipe
Low-pressure connecting pipe
(Between heat source units)
Main high-pressure pipe (To BC controller)
Main low-pressure pipe (To BC controller)
Wrap the pipe cover here.
(Keep out of contact with
the adjacent sheet metal.)
Field piping
(Low-pressure connecting pipe: To BC Controller)
Field piping
(Low-pressure connecting pipe: To heat source unit)
Field piping
(High-pressure connecting pipe)
1
7c
3
5
4
6
· If high-pressure twinning pipe is installed above the base of the
heat source unit, it should be no more than 200 mm [7-7/8 in.].
To BC controller
High-pressure twinning pipe
To BC controller
Upward slope
Downslope
200 mm
[7-7/8 in.]
max.
To
indoor unit
High-pressure
twinning pipe
Heat source unit 2
Heat source unit 1
WT06204X03.indd 3
7/22/2011 1:12:07 PM
