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Outdoor Unit Model PURY-P120 YHMU-A (-BS) PURY-P96 YHMU-A (-BS) PURY-P72 YHMU-A (-BS)
Item PURY-P120 THMU-A (-BS) PURY-P96 THMU-A (-BS) PURY-P72 THMU-A (-BS)
Liquid pipe ø 19.05 [3/4] ø 19.05 [3/4] ø 15.88 [5/8]
Gas pipe ø 28.58 [1-1/8] ø 22.2 [7/8] ø 19.05 [3/4]
Drain pipe O.D. ø 32 [1-1/4]
7. Connecting refrigerant pipes and drain pipes
7.1. Refrigerant piping work
This piping work must be done in accordance with the installation manuals for both
outdoor unit and BC controller (simultaneous cooling and heating R2 series).
• R2-series is designed to so that the refrigerant pipe from an outdoor unit is
received by BC controller and branches at the BC controller to connect be-
tween indoor units.
•For constraints on pipe length and allowable elevation differences, refer to the
outdoor unit manual.
•Braze the pipe connections.
Caution:
• Install the refrigerant piping for the indoor unit in accordance with the
following.
1. Cut the tip of the indoor unit piping, remove the gas, and then remove the
brazed cap.
[Fig. 7.1.1] (P.3)
A Cut
B Remove brazed cap
2. Pull out the insulation on the site refrigerant piping, braze the unit piping, and
replace the insulation in its original position.
Wrap the piping with insulating tape.
Note:
• When brazing the refrigerant pipes, be sure to braze, after covering a wet
cloth to the pipes of the units in order to prevent it from burning and
shrinking by heat.
[Fig. 7.1.2] (P.3)
A Wrap with a damp cloth to cool
•Pay strict attention when wrapping the copper piping since wrapping the
piping may cause condensation instead of preventing it.
6.2. Refrigerant pipe, drain pipe
[Fig. 6.2.1] (P.2)
<PEFY-AF1200CFM>
A Gas refrigerant piping brazing connection: ø22.2 (7/8)
B Liquid refrigerant piping brazing connection: ø9.52 (3/8)
C Drain pipe (O.D. ø32 [1-1/4], primary draining)
D Drain pipe (O.D. ø32 [1-1/4], secondary draining)
E Drain pipe (O.D. ø32 [1-1/4])
<PEFY-AF1200CFMR>
A Gas refrigerant piping brazing connection of main coil: ø22.2 (7/8)
B Liquid refrigerant piping brazing connection of main coil: ø9.52 (3/8)
C Gas refrigerant piping brazing connection of reheat coil: ø22.2 (7/8)
D Liquid refrigerant piping brazing connection of reheat coil: ø9.52 (3/8)
E Drain pipe (O.D. ø32 [1-1/4], primary draining)
F Drain pipe (O.D. ø32 [1-1/4], secondary draining)
G Drain pipe (O.D. ø32 [1-1/4])
[Fig. 7.1.3] (P.3)
A Insulation B Remove insulation
C Wrap with damp cloth D Return to original position
E Ensure that there is no gap F Insulation pipe (small) (accessory)
G Caution:
Pull out the insulation on the refrigerant piping at the site, braze the piping, and
replace the insulation in its original position.
Ta ke care to ensure that condensation does not form on exposed copper piping.
H Liquid refrigerant piping I Gas refrigerant piping
J Main body K Insulation pipe (large) (accessory)
L Site refrigerant piping
M Ensure that there are no gaps between the insulation and the body.
N Tie (long) (accessory)
O Ensure that there is no gap here. Joint should face up.
For PEFY-AF1200CFMR
• Use the supplied twinning pipe (CMY-R160-J) and field supplied twinning pipe
to connect between the BC controller and indoor units.
• Refer to [Fig. 7.1.5] for the detail of the field supplied twinning pipe.
[Fig. 7.1.4] (P.3)
A Outdoor unit (PURY-P120THMU (-BS), PURY-P120YHMU (-BS))
B BC controller
C Indoor unit (Main heat-exchanger)
D Indoor unit (Re-heating heat-exchanger)
E Twinning pipe (CMY-R160-J:optional)
F Twinning pipe (field supplied)
[Fig. 7.1.5] (P.3)
A Gas pipe: ø19.05 mm [3/4 in.]
Liquid pipe: ø9.52 mm [3/8 in.]
B Gas pipe: ø22.2 mm [7/8 in.]
Liquid pipe: ø9.52 mm [3/8 in.]
6. Refrigerant pipe and drain pipe specifications
To avoid condensation, provide sufficient antisweating and insulation to the refrig-
erant and drain pipes.
When using commercially available refrigerant pipes, be sure to wrap commer-
cially available insulation (with a heat-resisting temperature of more than 100 °C
[212 °F] and thickness given below) onto both liquid and gas pipes.
Insulate all indoor pipes with form polyethylene insulation with a minimum density
of 0.03 and a thickness as specified in the table below.
1 Select the thickness of insulation by pipe size.
2 If the unit is to be used on the top story of a building and under conditions of
high temperature and humidity, it is necessary to use pipe size and insulation
thicker than those given in the table above.
3 If there are customer’s specifications, follow them.
Insulating material’s thickness
More than 10 mm [13/32 in.]
More than 15 mm [19/32 in.]
Pipe size
6.4 to 25.4 mm [1/4 to 1 in.]
28.6 to 38.1 mm [1-1/8 to 1-1/2 in.]
6.1. Refrigerant pipe and drain pipe specifications
(Unit: mm [in.])
Refrigerant pipe*1
(Brazing connection)
[ PEFY-AF1200CFMR ]
(Unit: mm [in.])
Refrigerant pipe
(Brazing connection)
Outdoor Unit Model PUHY-P120 YHMU-A PUHY-P96 YHMU-A PUHY-P72 YHMU-A
Item PUHY-P120 THMU-A PUHY-P96 THMU-A PUHY-P72 THMU-A
Liquid pipe ø 12.7 [1/2] *1 ø 9.52 [3/8] (ø12.7 [1/2] if more than 90 m) ø 9.52 [3/8]
Gas pipe ø 22.2 [7/8] ø 22.2 [7/8] ø 19.05 [3/4] *2
Drain pipe O.D. ø 32 [1-1/4]
[ PEFY-AF1200CFM ]
*1: When the Outdoor Unit Model P120 is connected, use the supplied reducer.
*2: When the Outdoor Unit Model P72 is connected, use the supplied reducer.
*1:The pipe sizes in the above table show those used to connect outdoor units to BC controllers. Use liquid pipe of ø 9.52 [3/8] and gas pipe of ø 22.2 [7/8] to
connect indoor units to BC controllers. Separately sold twinning pipe is required for the connection.