Daikin VRV-WIII, Installation Manual

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English 10
Not recommendable but in case of emergency
You must use a torque wrench but if you are obliged to install the unit
without a torque wrench, you may follow the installation method men-
tioned below.
After the work is finished, make sure to check that there is no
gas leak.
When you keep on tightening the flare nut with a spanner, there is a
point where the tightening torque suddenly increases. From that
position, further tighten the flare nut the angle shown below:
9-4 Connecting the refrigerant piping
Connect piping to outside unit by using accessory pipes
(Refer to figure 20)
1. Gas side piping
2. (field supply)
3. Accessory pipe (2) ( THICK )
4. Liquid side pipe (field supply)
5. Flare nut (Included in the unit)
6. Accessory pipe (1) ( THIN ) and (3)
is not used.
7. Piping on HP/LP gas side (field supply)
8. Piping on suction gas side (field supply)
9. Cut off the hatched area and use it as a cover for the
drilled.
10. Hatched area
11. Accessory pipe (1) ( THIN )
12. Accessory pipe (2) and Accessory pipe (3)
13. Guideline for pipe machining
14. Accessory pipe (3)
15. Brazing
16. Accessory pipe (2) ( THICK )
17. Before fitting to the product, apply brazing.
Precautions for installation of units
Note
• The outside unit multi connection piping kit that is sold separately
as an option (BHFP22MA56·84, BHFP26MA56·84) is necessary
for the multi installation of outside units.
• See the installation manual attached to the kit with attention to
installation restrictions described in “connecting the refrigerant
piping” when installing.
1.
To avoid the risk of oil detention in the piping the piping between
the outside units must be routed level or slightly upward.
2.
The gas piping (both discharge and suction gas pipings in case of
the heat recovery system) after branched, install without fail a trap
of 200 mm or larger using the piping included in the piping kit for
connecting the outside unit. Otherwise, the refrigerant may stay
within the piping, causing any damage to the outside unit.
3.
If the piping length between the outside unit connecting pipe kit
or between the outside units exceeds 2 m, create a rise of
200 mm or more in the gas line within a length of 2 m from the kit.
Pipe size Further tightening angle Recommended arm length of tool
φ
9.5
60 to 90 degrees Approx. 200 mm
φ
12.7 30 to 60 degrees Approx. 250 mm
φ
15.9 30 to 60 degrees Approx. 300 mm
Pattern 1
Pattern 2
Prohibited pattern
to indoor unit
to indoor
unit
to indoor
unit
Downward
inclination
Downward
inclination
Change to pattern 1 or pattern 2
Oil remains in piping
Piping between outside units
200mm
or more
No trap has been installed in the gas piping.
★
Oil may remain in the farthest outside unit.
Change to pattern 1 or pattern 2
to indoor unit
Prohibited pattern
to indoor
unit
to indoor
unit
If 2 m or less
If 2 m or more
2m or less
2m or less
Rising height:
200 mm or more
Piping between outside unit
01_EN_3P153897-8L.fm Page 10 Friday, July 11, 2008 5:04 PM