Daikin FBQ20EAVAK Installation Manual page 75

01_EN_3P281953-1B.fm Page 14 Tu esday, January 25, 2011 3:35 PM
6-5 REFRIGERANT PIPE SIZE AND ALLOWABLE PIPE LENGTH
Piping bend radius
Piping diameter
φ9.5mm
φ15.9mm
〈 CAUTION 〉
The maximum allowable pipe length differs depending on the model. Please refer to the table below.
(1) Refrigerant pipe size
O u d t o r o u n t i c a p
20 · 24 · 36 · 45 · 48 type
(2) Allowable pipe length
Outdoor unit capacity
20 · 24 type
36 · 45 · 48 type
• Equivalent length is the pressure loss due to L joints, traps, and so on along the refrigerant piping converted
to a straight piping length of the same size and added to the overall value.
CAUTION
• Do not use pipe cutters and flare tools which have been used with refrigerant other than R410A.
• When connecting the flares, coat the flare section with ether oil or ester oil.
• Only use the flare nuts included with the unit. Using different flare nuts (one type) may cause the refrigerant
to leak.
• In order to prevent dirt, liquid or dust from entering the piping, cure the piping with a pinch or taping.
6-6 REFRIGERANT PIPING WORK
• The local interunit piping is connectable in four directions. (Refer to Fig. 7)
• Do not let anything other than the designated refrigerant (such as air or water) enter the refrigerant system.
• When connecting in a downward direction, make four round holes using a 6-mm diameter drill in the central
section around the knock hole and open the knock hole. (Refer to Fig. 8)
• Cutting out the two slits makes it possible to install as shown in Fig. 9. (Use a metal saw to cut out the slits.)
Screw for front panel
Forward
Pipe outlet panel screw
Downward
Fig. 7
English
Piping thickness
0.8mm
1.0mm
a c y t i L q i u
φ9.5 × t0.8
Maximum allowable pipe length
(It is equivalent length in the inside)
50m (70m)
70m (90m)
Front panel
Pipe outlet panel
Backward
Sideways
Bend radius
30mm or more
50mm or more
d i p p i e
Center area around
Dril
knock hole
Knock hole
Slit
Slit
Fig. 8
(mm)
G a s p p i e
φ15.9 × t1.0
Maximum allowable
height difference
30m
30m
Connecting pipe
Bottom frame
Fig. 9
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