Specifications

Features SiBE341027
14 General Information
5.4 Guidelines for Reuse of Existing Refrigerant Piping
 Piping limits for reuse of existing piping
 Existing refrigerant piping
Branch pipe
Pipe without corrosion whose withstanding pressure is 3.3MPa or more can be used
>> it can be used with “T pipe”, “Y pipe”, “header”
* The special pipe with the pressure reduction cannot be used.
- For the connection pipe for outdoor unit, only Y pipe, which is the kit dedicated to the necessary option,
can be used
Type of pipe
Pipe without corrosion whose withstanding pressure is 3.3MPa or more can be used
- When reuse R22 Indoor unit, process the flare of existing piping for R-410A again.
- When reuse R22 Indoor unit, use the flare nut for R-410A.
- For the thickness etc., refer to P.15.
→ Existing Daikin R-22 piping meets the minimum thickness of VRVIII-Q.
>> The “insulation of gas pipe only” is not supported.
Use the “insulation of both liquid and gas pipes”.
When replacing K(A) series or previous version, please confirm piping is “insulation of both liquid and gas
pipes.”
Refrigerant oil
SUNISO, MS, HAB, Barrel Freeze, Freol, Ether oil, Ester oil, and HP-5S can be used.
Single use
First indoor branch
First
indoor branch
First outdoor branch
*The rest of indoor units are
the same as for single use.
Colours in the diagram above are merely for identifying pipes referenced with symbols such as a.
Actual
piping length
150 m
300 m
40 m
10 m
Example
a+f+g+h+i
a+b+c+d+e+f+g+h+i
f+g+h+i
k+p
Equivalent
piping length
175 m
—
—
13 m
Level Difference
5 m
15 m
50 m
40 m
Example
q
s
r
r
If the outdoor unit is above.
If the outdoor unit is below.
Between the outdoor units (Multiple use)
Between the indoor units
Between the outdoor units
and the indoor units
Refrigerant piping length
Total piping length
Between the first indoor branch and the farthest indoor unit
Between the outdoor branch and the last outdoor unit
Maximum
allowable
piping length
Maximum
allowable
level difference
Multiple use