Mitsubishi Electric Mr.SLIM PUZ-ZM71VHA Manual De Instalación página 11

4. Installing the refrigerant piping
(1)
B
A
I
F
Fig. 4-5
A Valve I Double spanner section
B Unit side (Do not apply a spanner other than to this section.
C Handle Doing so would cause coolant leaks.)
D Cap J Seal section
E Local pipe side (Seal the end of the heat insulation material at the
F Pipe cover pipe connection section with whatever seal mate-
G Service port rial you have on hand so that water does not infil-
H Wrench hole trate the heat insulation material.)
B
C
Fig. 4-6
4.6. Addition of refrigerant
• Additional charging is not necessary if the pipe length does not exceed 30 m.
• If the pipe length exceeds 30 m, charge the unit with additional 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 stop 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
ZM71 -55 m
G
D
H
J
E
A
* The figure to the left is an example only.
The stop valve shape, service port position,
etc., may vary according to the model.
* Turn section A only.
(Do not further tighten sections A and B
D
together.)
C Charge hose
D Service port
Additional refrigerant charging amount
Permitted verti-
cal difference
31 - 40 m
-30 m 0.4 kg
4.5. Stop valve opening method
The stop valve opening method varies according to the outdoor unit model. Use the
appropriate method to open the stop valves.
(1) Gas/Liquid side of ZM71 (Fig. 4-5)
1 Remove the cap and turn the valve rod counterclockwise as far as it will go with
the use of a 4 mm hexagonal wrench. Stop turning when it hits the stopper.
(ø9.52: Approximately 10 revolutions)
2 Make sure that the stop valve is open completely, push in the handle and rotate
the cap back to its original position.
Refrigerant pipes are protectively wrapped for ZM71
• The pipes can be protectively wrapped up to a diameter of ø90 before or after
connecting the pipes. Cut out the knockout in the pipe cover following the groove
and wrap the pipes.
Pipe inlet gap for ZM71
• Use putty or sealant to seal the pipe inlet around the pipes so that no gaps remain.
(If the gaps are not closed, noise may be emitted or water and dust will enter the
unit and breakdown may result.)
Precautions when using the charge valve (Fig. 4-6)
Do not tighten the service port too much when installing it, otherwise, the valve core
could be deformed and become loose, causing a gas leak.
After positioning section B in the desired direction, turn section A only and tighten it.
Do not further tighten sections A and B together after tightening section A.
Warning:
When installing the unit, securely connect the refrigerant pipes before starting
the compressor.
• 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.
/Maximum amount
41 - 50 m 51 - 55 m
0.8 kg
of refrigerant
3.6 kg
en
9