Mitsubishi Electric Mr. Slim PUHZ-RP200YHA2 Manual De Instalación página 7

4. Installing the refrigerant piping
At time of shipping
Outdoor unit
(kg)
RP200 6.5
RP250 7.1
When length exceeds 70 m
When the total length of the piping exceeds 70 m, calculate the amount of additional charge based on the following requirements.
Note: If the calculation produces a negative number (i.e. a "minus" charge), of if calculation results in an amount that is less than the "Additional charge amount for 70 m",
perform the additional charge using the amount shown in "Additional charge amount for 70 m".
Main piping:
Amount of additional Liquid line size
charge ø12.7 overall length ×
=
0.12
(kg) (m) × 0.12 (kg/m)
Additional charge amount RP200 3.6 kg
for 70 meters RP250 4.8 kg
Fig. 4-8
4.7. Precautions when reusing existing R22 refrigerant pipes
• Refer to the flowchart below to determine if the existing pipes can be used and if it is necessary to use a filter dryer.
• If the diameter of the existing pipes is different from the specified diameter, refer to technological data materials to confirm if the pipes can be used.
• If the diameter of the existing gas side pipe is bigger than the specified diameter, turn SW8-1 on.
The existing pipe thickness meets specifi-
cations and the pipes are not damaged.
Check if the existing air conditioner can operate.
After operating the cooling system for about 30
minutes, do a pump down work.
Disconnect the existing air conditioner from the
pipes.
Attach the new air conditioner
Perform the airtight test, vacuum air purging, ad-
ditional refrigerant charging (if necessary), and
gas leak check.
Replacement operation
30 m and less 31-40 m and less
0.9 kg
No additional
charge necessary
1.2 kg
Main piping:
Liquid line size
ø9.52 overall length ×
+
0.09 (Gas line: ø28.58)
(m) × 0.09 (kg/m)
1 Indoor unit
2 Outdoor unit
3 Main piping
4 Branch piping
5 Multi distribution
pipe (option)
Measure the existing pipe thickness and
check for damage.
* If the existing air conditioner 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.
* Refer to page 11
A+B+C+D
Amount of additional refrigerant charge (kg)
41-50 m and less 51-60 m and less
1.8 kg 2.7 kg
2.4 kg 3.6 kg
Branch piping: Branch piping:
Liquid line size Liquid line size
ø9.52 overall length × ø6.35 overall length ×
+ +
0.06 (Gas line: ø15.88) 0.02 (Gas line: ø15.88)
(m) × 0.06 (kg/m) (m) × 0.02 (kg/m)
Outdoor unit : RP250 A: ø12.7 ... 65 m
Indoor unit 1 : RP71 B: ø9.52 ... 5 m
Indoor unit 2 : RP71 C: ø9.52 ... 5 m
Indoor unit 3 : RP71 D: ø9.52 ... 5 m
Main piping ø12.7 is A = 65 m
Branch piping ø9.52 is B + C + D = 15 m
Therefore, the amount of additional charge is: 65 × 0.12 + 15 × 0.06 -3.6=5.1 (kg)
(Fractions are rounded up)
The existing pipe thickness does not meet
specifications or the pipes are damaged.
The existing pipes cannot be reused.
Use new pipes.
61-70 m and less 71-120 m and less
Calculate the
3.6 kg
amount of additional
refrigerant charge
using formula pro-
4.8 kg
vided below.
– 3.6 (kg)
7