Mitsubishi Electric Mr.SLIM PUZ-MKA Série Manuel D'installation page 10

4. Installing the refrigerant piping
Refilling refrigerant charge (kg) for less than 30 m (Chargeless pipe length)
Outdoor unit 5 m and less
M100 2.0
M125, 140 2.6
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.
The existing pipe thickness meets specifica-
tions 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,
additional refrigerant charging (if necessary),
and gas leak check.
Test run
* Refer to 7.2.
<Limits of refrigerant piping installation>
M100 : A+B+C (+D) [ 55 m
M125, 140 : A+B+C (+D) [ 65 m
* "D" is for triple.
10
6 - 10 m
2.2
2.8
Measure the existing pipe thickness and
check for damage.
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* If the existing air conditioner cannot operate, use a
refrigerant recovery device to collect the refrigerant.
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* In case existing pipes were used for gas or oil
heat pump systems, be sure to clean the pipes.
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A Indoor unit
B Outdoor unit
C Multi distribution pipe (option)
D Height difference (Indoor unit -
Outdoor unit) Max. 30 m
E Height difference (Indoor unit -
Indoor unit) Max. 1 m
A: Main piping
B, C, D: Branch piping
Fig. 4-8
11 - 15 m 16 - 20 m
2.4 2.6
3.0 3.2
The existing pipe thickness does not meet
specifications or the pipes are damaged.
The existing pipes cannot be reused.
Use new pipes.
4.8. For twin/triple combination (Fig. 4-8)
• When this unit is used as a FREE COMPO MULTI unit, install the refrigerant
piping with the restrictions indicated in the drawing on the left. In addition, if the
restrictions are going to be exceeded, or if there are going to be combinations of
indoor and outdoor units, refer to installation instructions for the indoor unit for
details about the installation.
Permissible total
Outdoor unit piping length
A+B+C+D
M100 55 m and less
M125, 140 65 m and less
Outdoor unit
M100-140
21 - 25 m 26 - 30 m
2.8 3.1
3.4 3.6
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Charge-less
B or C or D piping length
A+B+C+D
20 m and less 30 m and less
20 m and less 30 m and less
| B-C | or | B-D |
No. of bends
or | C-D |
8 m and less Within 15