1-49
1
1
In high humidity environment, reinforce the insulation material for the refrigerant piping. Failure to do so may result in
condensation on the surface of the insulation material.
Use materials with good heat-resistant properties as the heat insulator for the pipes. Ensure to insulate both the gas side
and liquid side pipes.
If the pipes are not adequately insulated, condensation and water leakages may occur.
Ensure that the current insulation covers the pipes up to the unit’s connecting part.
If the piping is exposed, it may cause condensation or burn (when touch the pipe).
Precautions for insulation installation
Maximum temperature limit of gas or liquid piping exceeds 120 °C
Application for ether-based oil
Dimensions when adding fl are nuts and the tightening torque
Precautions for flare nut installation
Piping size
Tightening torque
Flare section dimensions A
Flare confi guration
ø 6.35
14.0N•m ~ 18.0N•m
(140k
g
f•cm ~ 180
k
g
f•cm)
8.7 ~ 9.
1
90° ± 2°
45° ±1°
ø 9.52
34.0N•m ~ 42.0N•m
(340k
g
f•cm ~ 420
k
g
f•cm)
12.8 ~ 13.2
ø 12.7
49.0N•m ~ 55.0N•m
(500k
g
f•cm ~ 560
k
g
f•cm)
16.2 ~ 16.6
ø 15.88
68.0N•m ~ 82.0N•m
(690k
g
f•cm ~ 830
k
g
f•cm)
19.3 ~ 19.7
ø 19.0
5
100N•m ~ 120N•m
(1020k
g
f•cm ~ 1220k
g
f•cm)
23.6 ~ 24.0
After piping connection has completed, ensure there is no gas leakage.
When tightening the fl are nut, coat the fl ares (inner surface only) with refrigerant oil on the
fl ares
Firstly, screw in 3-4 turns by hand.
* Ensure not to get oil on the screw part.
Refrigerant oil used is ether-based.
Once the piping connections are completed, perform leakage inspection using nitrogen gas.
7. SELECTING THE LOCATION FOR
INSTALLATION SERVICE
When installing multiple units, allow enough space in between the units and
the side of the building.
(unit: mm)
(3)
Rear mounting
(4)
Bottom mounting
Flare processing
Joint piping B
Joint piping A
Cutting
(Right side face)
Flare processing
Joint piping B
Joint piping A
Cutting
(Right side face)
(Gas piping connection) While the main gas side pipe is ø25.4, since connecting the outdoor unit's 3-way valve requires a ø19.05
fl are, please be sure to use standard accessories joint piping B or A for connection (brazing), and connect as follows.
1. Since standard accessory joint piping B comes supplied for connecting the outdoor unit's 3-way valve, machine the upper
edge to ø19.05 fl are specifi cations.
2. Refer to connection pipe process examples (1) - (4) to cut the joint piping A to the necessary length.
3. Braze the machined (cut) joint piping A to the bottom edge of joint piping B.
4. In order to protect wiring and parts in the unit, please carry out brazing outside the unit (since each type of joint piping is
differently oriented, carry out brazing according to the orientations shown in the connection pipe process diagrams.
5. Connect the brazed connection pipes to the outdoor unit's 3-way valve through the fl are connection.
When cutting the pipe, use a pipe cutter and be sure to carry out deburring.
Ensure that water, sand etc. do not enter the interior of the piping.
Using a fl are tool, carry out sound fl are process.
Example of connecting pipe process (U-200PE2R8A/U-224PE2R8A)
(1)
Front mounting
(2)
Right mounting/flare processing
Flare
processing
Joint
piping B
Joint
piping A
Cutting
(Right side face)
(Front face)
Flare processing
Joint
piping B
Joint
piping A
Cutting
(Right side face)
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