Refrigerant Piping Work; Piping Materials - Hisense AVWT-408FHFSHA Installation Manual

5.Refrigerant Piping Work

Use refrigerant R410A in the refrigerant cycle.
●
Do not charge oxygen, acetylene or other flammable and poisonous gases into the refrigerant cycle when
performing a leakage test or an air-tight test. These types of gases are extremely dangerous and can cause
an explosion. It is recommended that compressed air, nitrogen be used for these types of tests.
Check to ensure that no pressure exists inside the stop valve before removing the flange
●

5.1 Piping Materials

Prepare copper pipes to be supplied in the locality.
(1)
Select the piping size from the Technical Catalog.
(2)
Select clean copper pipes. Make sure there is no dust and moisture inside the pipes. Purge pipes with nitrogen or
(3)
dry air to remove any dust or foreign matters before connecting pipes. Do not use any tools which produce a lot of
swarf such as a saw or a grinder.
●Cautions for Refrigerant Pipe Ends
●Cautions for Piping Connection Work
Connect the indoor/outdoor units with refrigerant pipes. Fix the pipes and pay attention
(1)
not to contact with weak materials such as ceiling. Otherwise, vibration of piping may give
off abnormal sound.
Apply refrigerant oil slightly on the sheet surface of the pipe and flare nut before the
(2)
flaring work. Then tighten the flare nut by two spanners with the specified tightening
torque. Perform the flaring work on the liquid piping then on the gas piping. Check the gas
leakage after the flaring work.
NOTE:
Refrigerant oil is field-supplied.
】
【Model: FVC68D
In case the temperature and humidity inside the ceiling exceed 27°C/RH80%, apply additional insulation
(3)
(approx. 3/8in. thickness) to the accessory insulation. It prevents dew condensation on the surface of the
insulation (refrigerant pipe only).
Perform the air-tight test (601psi for the test pressure).
(4)
Perform cold insulation work by insulating and taping the flare connection and reducer connection. Also
(5)
insulate all the refrigerant pipes.
●When tightening the flare nut, use two
spanners.
Do not apply excessive force to the flare nut when tightening. Otherwise, the flare nut may crack due to
aged deterioration and refrigerant leakage may occur. Use the specified tightening torque.
Ensure to connect the piping among the units in the same refrigerant cycle
When installing pipe through the wall, secure
a cap at the end of the pipe.
Correct
Hole
Attach a cap or vinyl tape.
DANGER
CAUTION
Do not place the pipe directly on the
ground
Incorrect
Correct
Hole
Attach a cap or vinyl tape.
with two spanners
WARNING
11
.
Correct
Incorrect
Incorrect
Rain water can enter
Attach a cap or
vinyl bag with
rubber band.
Apply Refrigerant Oil