Mitsubishi Electric PUHZ-SHW-HA Serie Manual De Instalación página 8

4. Installing the refrigerant piping
Fig. 4-9
4.7. Precautions when reusing existing R22 refrigerant pipes (Only for Air-Conditioners)
• Refer to the fl owchart below to determine if the existing pipes can be used and if it is necessary to use a fi lter dryer.
• If the diameter of the existing pipes is different from the specifi ed diameter, refer to technological data materials to confi rm if the pipes can be used.
The existing pipe thickness meets specifi ca-
tions and the pipes are not damaged.
▼
Check if the existing outdoor unit can operate.
▼
After operating the cooling system for about 30
minutes, do a pump down work.
▼
Disconnect the existing outdoor unit from the
pipes.
▼
Attach the new outdoor unit
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Perform the airtight test, vacuum air purging,
additional refrigerant charging (if necessary),
and gas leak check.
▼
Test run
* Refer to 8.2.
8
1 Indoor unit Outdoor unit : SHW230
2 Outdoor unit Water heat exchanger 1
3 Main piping Water heat exchanger 2
4 Branch piping Water heat exchanger 3
5 Multi distri-
bution pipe Main piping ø9.52 is A = 65 m
(option) Branch piping ø9.52 is B + C + D = 15 m
Therefore, the amount of additional charge is: 65 × 0.14 + 15 × 0.05 - 4.3 = 5.6 (kg)
(Fractions are rounded up)
Measure the existing pipe thickness and
check for damage.
* If the existing outdoor unit cannot operate, use a
refrigerant recovery device to collect the refrigerant.
* In case existing pipes were used for gas or oil heat
pump systems, be sure to clean the pipes.
A: ø9.52 ... 65 m
B: ø9.52 ... 5 m
C: ø9.52 ... 5 m
D: ø9.52 ... 5 m
The existing pipe thickness does not meet
specifi cations or the pipes are damaged.
▼
The existing pipes cannot be reused.
Use new pipes.