Mitsubishi Electric CITY MULTI PUHY-HP-YHM-A Serie Manual De Instalación página 14

Downstream indoor unit capacity
Downstream indoor unit capacity
More than 201 and less than
Less than 200 in total
CMY-Y102S-G2
6 Use a fitting if a specified refrigerant pipe has a different diameter from that of
a branching pipe.
7 Always observe the restrictions on the refrigerant piping (such as rated length,
height difference, and piping diameter) to prevent equipment failure or a de-
cline in heating/cooling performance.
8 Branching cannot be made after header branching (corresponding parts are
marked with in the diagram below).
To the outdoor unit
To the outdoor unit
9 Either a lack or an excess of refrigerant causes the unit to make an emergency
stop. Charge the system with an appropriate amount of refrigerant. When serv-
icing, always check the notes concerning pipe length and amount of additional
refrigerant at both locations, the refrigerant volume calculation table on the
back of the service panel and the additional refrigerant section on the labels
for the combined number of indoor units (Refer to item 9.2. for detailed infor-
mation on refrigerant piping system).
0 Be sure to charge the system using liquid refrigerant.
A Never use refrigerant to perform an air purge. Always evacuate using a
vacuum pump.
B Always insulate the piping properly. Insufficient insulation will result in a de-
cline in heating/cooling performance, water drops from condensation and other
such problems (Refer to item 10.4 for thermal insulation of refrigerant piping).
C When connecting the refrigerant piping, make sure the valve of the outdoor
unit is completely closed (the factory setting) and do not operate it until the
refrigerant piping for the outdoor and indoor units has been connected, a re-
frigerant leakage test has been performed and the evacuation process has
been completed.
D Braze only with non-oxide brazing material for piping. Failure to do so
may damage the compressor. Be sure to perform the non-oxidation braz-
ing with a nitrogen purge.
Do not use any commercially available anti-oxidizing agent since it may
cause pipe corrosion and degrading of the refrigerant oil.
Please contact Mitsubishi Electric for more details.
(Refer to item 10.2. for details of the piping connection and valve operation)
E Never perform outdoor unit piping connection work when it is raining.
Warning:
When installing and moving the unit, do not charge the system with any
other refrigerant other than the refrigerant specified on the unit.
- Mixing of a different refrigerant, air, etc. may cause the refrigerant cycle to mal-
function and may result in severe damage.
14
Indoor twinning pipe set model
Line branch
Downstream indoor unit capacity
More than 401 and less than
400 in total 650 in total
CMY-Y102L-G2 CMY-Y202-G2
CAP
Header branch
4 branches 8 branches
CMY-Y104-G CMY-Y108-G CMY-Y1010-G
Caution:
• Use a vacuum pump with a reverse flow check valve.
- If the vacuum pump does not have a reverse flow check valve, the vacuum
pump oil may flow back into the refrigerant cycle and cause deterioration of
the refrigerator oil.
• Do not use the tools shown below used with conventional refrigerant.
(Gauge manifold, charge hose, gas leak detector, check valve, refriger-
ant charge base, vacuum gauge, refrigerant recovery equipment)
- Mixing of conventional refrigerant and refrigerator oil may cause the refrig-
erator oil to deteriorate.
- Mixing of water will cause the refrigerator oil to deteriorate.
- R410A refrigerant does not contain any chlorine. Therefore, gas leak detec-
tors for conventional refrigerants will not react to it.
• Manage the tools used for R410A more carefully than normal.
- If dust, dirt, or water gets in the refrigerant cycle, the refrigerator oil will dete-
riorate.
• Never use existing refrigerant piping.
- The large amount of chlorine in conventional refrigerant and refrigerator oil
in the existing piping will cause the new refrigerant to deteriorate.
• Store the piping to be used during installation indoors and keep both
ends of the piping sealed until just before brazing.
- If dust, dirt, or water gets into the refrigerant cycle, the oil will deteriorate and
the compressor may fail.
• Do not use a charging cylinder.
- Using a charging cylinder may cause the refrigerant to deteriorate.
• Do not use special detergents for washing piping.
Outdoor Twinning Kit model
Total outdoor model
10 branches
P400 ~ P500
CMY-Y100VBK2