Daikin VAM-FA8VE Technical Data Manual page 236

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• HRV • VKM-GA(M)V1
• When connecting the flare nut, coat the flare section (both inside and outside) with ester oil or ether
oil, rotate three or four times first, then screw in. (Refer to Fig. 12)
Torque wrench
Flare nut
•
Refer to the "Table 1" for tightening torque.
CAUTION
Over-tightening may damage the flare and cause a refrigerant leakage.
•
If a torque wrench is not available, tighten the nut in the following manner. Once work is complete, make
sure there is no gas leaking. As the flare nut is tightened with the wrench, the torque will suddenly
increase. From that position, tighten the nut to the angle shown on " Table 2 ".
Table 2
Pipe size Further tightening angle
φ 6.4 (1/4")
60 to 90 degrees
φ 12.7 (1/2")
30 to 60 degrees
•
After the work is finished, make sure to check that there is no gas leak.
•
After checking the pipe-connection for gas leakage, be sure to insulate the liquid and gas piping.
(Refer to Fig. 13)
Piping insulation
material (main unit)
(1) Attach to base
Main unit
(2) Clamp
(accessory)
Precautions for insulation material installation on flare nut connection
(1) Make sure that the piping insulation material comes in close contact with the base so that there will be
no air passage at the edges of the piping insulation material.
(2) Do not tighten the clamp excessively so as to maintain the appropriate thickness of the insulator.
(3) Wrap the sealing material around the upper part of the flare nut connection.
(4) Turn the seams up (see the figure on the right-hand side).
CAUTION
Be sure to insulate any field piping all the way to the piping connection inside the unit. Any exposed piping
may cause condensation or burns if touched.
•
Connect refrigerant piping and branching according to the attached installation manuals that come with
the outdoor unit.
Model
VKM50GAMV1, VKM50GAV1
VKM80GAMV1, VKM80GAV1
VKM100GAMV1, VKM100GAV1
• HRV • Heat Reclaim Ventilation
Spanner
Piping union
Fig. 11
Recommended arm length of tool
Approx. 150mm
Approx. 250mm
Gas Piping Insulation Procedure
Insulation for fitting (accessory)
Flare nut
(4) Turn seams up
connection
Piping insulation material
(locally procured)
Liquid Piping Insulation Procedure
Piping insulation
material (main unit)
Gas pipe
(1) Attach to base
Liquid
Main unit
pipe
(2) Clamp
(accessory)
Gas piping diameter
φ 12.7
Ester oil or ether oil
Mid sealing pad
(accessory)
(3) Wrap over the
top of the flare
nut connection.
Insulation for fitting
(accessory)
Flare nut connection
(4) Turn seams up
Piping insulation material
(Locally procured)
Liquid piping diameter
φ 6.4
Fig. 12
Fig. 13
Seams up