Daikin GYEQ20AN Service Manual page 54

Installation Work Manual
Performing piping work using the external filter
WARNING
Install the external filter on the refrigerant pipe for each outdoor unit. Refer to the installation example and
determine the installation position.
When braze welding is performed on the external filter for the gas pipe, be sure to remove the gasket.
When braze welding is performed on the gas pipe flange, cool the flange base using a damp cloth or the like.
Apply refrigerating machine oil (FVC68D) to the gas pipe flange gasket portion.
L o o s e l y t i g h t e n t h e g a s p i p e f l a n g e b o l t s , a n d t h e n f u l l y t i g h t e n t h e m d i a g o n a l l y.
(Tightening torque: 49±5.0 N·m)
Tightening torque for fluid pipe flare is 61.8 ~ 75.4 N·m.
Be careful of the direction of the external filter for the gas pipe (indoor unit side
Install the external filter servicing port for the gas pipe in a direction that allows maintenance to be performed.
Install the filter between the first and second clamps of the connecting pipe, in a position from where
maintenance can be performed.
Install the external filter to a position where the heat insulator can be removed.
For the first and second clamps, clamp one side of the fluid pipe external filter within 0.3m from
center and clamp the gas pipe external filter within 0.75m from center.
Since the filter may need to be replaced, locally procured finishing and racking should be fitted so
that they can be desorbed.
When the racking, etc. is not fitted, perform waterproofing to the external filter heat insulator.
[Installation example]
Discharge gas pipe
Suction gas pipe
Be careful of the direction.
Indoor unit side
43
Install the external filter close to the outdoor unit.
When the vibration proof stand is used, do not install the external filter close to the
outdoor unit.
The vibration of the outdoor unit may break the pipe and cause a refrigerant leak.
Fix the piping on both ends of the external filter. When the piping fixation is
insufficient, the vibration breaks the pipe and causes a refrigerant leak.
When braze welding is performed on the pipe, be sure to use nitrogen blow.
Without nitrogen blow, it may cause filter clogging with oxidized scale, compressor
trouble, etc.
within 0.75m within 0.75m
Piping fixed part
Outdoor unit side
Piping fixed part
Fluid pipe
within 0.3m
within 1.5m
*1 One side should be within 0.3m
7 Installing the Outdoor Unit
Piping fixed part
1.5m or more
(when the vibration proof stand is used)
within 3.0m
1.5m or more
*1 *1
within 0.3m
(when the vibration proof stand is used)
within 3.0m
– 15 –
SiAUY361411EA
outdoor unit side).
Outdoor unit
059512-00EN07
0FGHP-EN0801 DGJ002
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