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(5) Piping Connection, Installation
1)Check if the stop valve of outdoor unit is closed.
2)Please connect the piping between indoor and outdoor unit. When tightening the joints of piping, in the inside and
outside of flare piping, please coated with a layer of refrigerant oil [Field Supplied (Idemitsu Kosan Co., Ltd.
Synthetic Oil "FVC68D")], and in accordance with the provisions of tightening torque with double spanner to tighten.
After tightening, please confirm the gas leakage once more. During brazing, please blow nitrogen into the piping.
3)Connect the indoor unit and outdoor unit with field-supplied refrigerant piping. Suspend the refrigerant piping at
certain points and prevent the refrigerant piping from touching the weak part of the building such as wall, ceiling,
etc. (If touched, abnormal sound may occur due to vibration of the piping. Pay special attention in case of short
piping length.)
4)Please perform an air-tight test. Connect a manifold gauge to the check joints of the liquid and gas stop valves in
the outdoor unit. Do not open the stop valves. Apply nitrogen gas pressure of 4.15MPaG.
5)The piping joint is covered with thermal insulation material and fixed with tape. In addition, the gaseous side and
liquid side of the refrigerant piping also need to be coated with thermal insulation material separately.
Required Torque:
Piping Size (mm) and
Flare Nut
Φ6.35(1/4")
Φ9.53(3/8")
Φ12.7(1/2")
Φ15.88(5/8")
Φ19.05(3/4")
①
After connection piping and before implementation the air-tight test, please remove the liquid and gas stop valve caps, the spindle
valve ensures that be closed with tightening torque N.m. tightening the flare nut do not use more than the torque marking on the
table, too large torque will result in the spindle valve leakage.
②
After locking work is completed, please implement air leakage test.
※Note: 1.The work that after use the flare nut to connect pipe and stop valve, will be effective.
2.Because check joints and flare nut cannot connect, so please use the charging hoses. The spindle valve cap of stop valve is
removed, due to internal O-ring and thread will be opened, the voices caused by gas emitting, which has nothing to do with leakage.
3.Do not apply an abnormal big force to the spindle valve at the complete opening (5.0N.m or smaller).
6)In order to prevent rainwater from entering the unit, be sure to install the piping cover, and install heat insulating materials in
the piping so that there will be no gaps.
(6) Vacuum Work
1)
Details of stop valve operation, please refer to the attention of nameplate inside service cover description.
2)Connect a manifold gauge to the check joints at both sides. Continue vacuum pumping work until the pressure reaches -
0.1MPa(-750mmHg) or lower for one to two hours.
3)After vacuum pumping work, stop the manifolds valve, stop the vacuum pump and leave it for one hour. Check to ensure
that the pressure in the manifold gauge does not increase.
4)Because check joints and flare nut cannot connect, so please use the charging hoses. After the work, please tighten the flare
nut with 16N.m of torque.
5)Check for any gas leakage at the flare nut connections, or brazed parts by gas leakage tester or foaming agent. The ff.
is recommended for foam testing fluid [Field supplied (NUNPRO "SNOPP" or Yokogawa & Co., Ltd. "ｷｭﾎﾟﾌﾚッｸｽ")],
component is not clear which is general household cleaner do not use the liquid as a foam testing.
6)Vacuum drying determination example:
Spindle Valve Torque
Tightening
Gas
Torque N. m
14-18
11~14
34-42
49-61
Hexagonal Wrench
68-82
Gas
100-120
8mm
N．m
Liquid
7~9
Liquid
4mm
11
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