Mitsubishi Electric Mr.SLIM PUZ-ZMDA Serie Manuel D'installation page 13

4. Installing the refrigerant piping
4.6. Addition of refrigerant
• Additional charging is not necessary if the pipe length does not exceed the
chargeless pipe length.
• If the pipe length exceeds the chargeless pipe length, charge the unit with ad-
ditional R32 refrigerant according to the permitted pipe lengths in the chart below.
* When the unit is stopped, charge the unit with the additional refrigerant through
the liquid valve after the pipe extensions and indoor unit have been vacu-
umized.
When the unit is operating, add refrigerant to the gas check valve using a
safety charger. Do not add liquid refrigerant directly to the check valve.
* After charging the unit with refrigerant, note the added refrigerant amount on
the service label (attached to the unit).
Refer to the "1.5. Using R32 refrigerant air conditioners" for more information.
Permitted pipe
Model
length
ZM100-140 - 100 m
Refilling refrigerant charge (kg) for less than the chargeless pipe length
Outdoor unit 5 m and less
ZM100-140 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 Evacua-
tion, additional refrigerant charging (if neces-
sary), and gas leak check.
▼
Test run
* Refer to 7.2.
Permitted vertical Chargeless
difference pipe length
- 30 m 40 m
6 - 10 m 11 - 15 m
2.7 2.8
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 for
ZM100-140 models.
• Be careful when installing multiple units. Connecting to an incorrect indoor unit
can lead to abnormally high pressure and have a serious effect on operation
performance.
○
R32 maintenance refilling: Before servicing refilling the equipment with R32 to
ensure that there is no risk of explosion from electrical sparks it must be ensured
that the equipment machine is 100% disconnected from the mains supply.
Additional refrigerant charging amount
41 - 50 m 51 - 60 m 61 - 70 m
0.4 kg 0.8 kg 1.2 kg
16 - 20 m
2.9
The existing pipes cannot be reused.
Use new pipes.
71 - 80 m 81 - 90 m 91 - 100 m
1.6 kg 2.0 kg 2.4 kg
21 - 25 m 26 - 30 m
3.1 3.2
The existing pipe thickness does not meet
specifications or the pipes are damaged.
▼
○
Maximum
amount of
refrigerant
6.0 kg
31 - 40 m
3.6
en
11