Guidelines For Reuse Of Existing Refrigerant Piping - Daikin VRV II-Q RQYQ8-48PY1B Service Manual

Features
5.4

Guidelines for Reuse of Existing Refrigerant Piping

Piping limits for reuse of existing piping
Single use
First indoor branch
Colours in the diagram above are merely for identifying pipes referenced with symbols such as a.
Refrigerant piping length
Maximum
Total piping length
allowable
Between the first indoor branch and the farthest indoor unit
piping length
Between the outdoor branch and the last outdoor unit
Between the outdoor units (Multiple use)
Maximum
Between the indoor units
allowable
level difference
Between the outdoor units
and the indoor units
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.
14
Multiple use
Actual
piping length
150 m
300 m
If the outdoor unit is above.
If the outdoor unit is below.
First outdoor branch
*The rest of indoor units are
the same as for single use.
Example
a+f+g+h+i
a+b+c+d+e+f+g+h+i
40 m
f+g+h+i
10 m k+p
Level Difference Example
5 m
15 m
50 m
40 m
General Information
SiBE341027
First
indoor branch
Equivalent
piping length
175 m
—
—
13 m
q
s
r
r