Refrigerant Piping System - Mitsubishi Electric CITY MULTI PQHY-P-TLMU-A1 Manual De Instalación

Copper pipe size and radial thickness for R410A CITY MULTI.
Radial thickness Radial thickness
ø6.35 0.8
ø9.52 0.8
ø12.7 0.8
ø15.88 1.0
*ø19.05 1.2
*ø19.05 1.0
ø22.2 1.0
ø25.4 1.0
ø28.58 1.0
ø31.75 1.1
ø34.93 1.2
ø41.28 1.4
conditioner.
6
of a branching pipe.
7 Follow the restrictions on the refrigerant piping (such as rated length, height
heating/cooling performance.
Indoor twinning pipe set model PQHY-P series ONLY
Line branch
Down-stream unit
Down-stream unit
model
model
More than 73 and
Less than 72 in total
less than 144 in total
CMY-Y102SS-G2 CMY-Y102LS-G2
Indoor twinning pipe set model PQHY-P series ONLY
Header branch
4 branching 8 branching
CMY-Y104C-G CMY-Y108C-G
Heat source twinning kit model
PQHY-P series ONLY
Total heat source model Total heat source model
P144 ~ P240
CMY-Y100CBK3 CMY-Y200CBK2
8 Indoor units cannot be further branched down stream after the branch
To the heat source unit
To the heat source
unit
9 A lack or an excess of refrigerant can cause the unit to stop. Charge the
system with the appropriate amount of refrigerant. When servicing, always
check the information concerning pipe length and amount of additional
refrigerant at 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 information
0 Charge the system using liquid refrigerant.
a Never use refrigerant to air purge. Always evacuate using a vacuum pump.
b
a decline in heating/cooling performance, condensation and other such
c When connecting the refrigerant piping, make sure the valve of the heat
it until the refrigerant piping for the heat source unit, indoor units and
BC controller has been connected, a refrigerant leakage test has been
performed, and the evacuation process has been completed.
d Braze only with non-oxided material. Failure to do so may damage the
compressor. Braze using nitrogen purge.
Do not use any commercially available anti-oxidizing agent, because it
may cause pipe corrosion and degrade the refrigerant oil.
Contact Mitsubishi Electric for more details.
e Never perform piping connections when raining.
28
Pipe type
32 Type-O
32 Type-O
32 Type-O
40 Type-O
48 Type-O
40 Type-1/2H or H
40 Type-1/2H or H
40 Type-1/2H or H
40 Type-1/2H or H
44 Type-1/2H or H
48 Type-1/2H or H
56 Type-1/2H or H
Down-stream unit Down-stream unit
model model
More than 145 and More than 241 in
less than 240 in total total
CMY-Y202S-G2 CMY-Y302S-G2
10 branching
CMY-Y1010C-G
P288 ~ P360
CAP
Warning:
When installing and relocating the unit, do not charge the system with any
- Mixing different refrigerant, air, etc. may cause the refrigerant cycle to
malfunction and result in severe damage.
Caution:
the refrigerant oil.
Do not use the tools shown below used with conventional refrigerant.
(Gauge manifold, charge hose, gas leak detector, check valve,
refrigerant charge base, vacuum gauge, refrigerant recovery
equipment)
- Mixing of conventional refrigerant and refrigerant oil may cause the
refrigerant oil to deteriorate.
- Mixing of water will cause the refrigerant oil to deteriorate.
- R410A refrigerant does not contain any chlorine. Therefore, gas leak
detectors for conventional refrigerants will not react to it.
Manage tools used for R410A carefully.
- If dust, dirt, or water gets in the refrigerant cycle, the refrigerant oil will
deteriorate.
Never use existing refrigerant piping.
- The large amount of chlorine in conventional refrigerant and refrigerant oil
in 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 get 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 to wash the piping.

9.2. Refrigerant piping system

Example of refrigerant piping system
[Fig. 9.2.1] (P.5, P.7 - 8)
Heat source model
Gas side
Liquid pipe
Model number
Joint
4-Branch header (Downstream indoor unit model total
8-Branch header (Downstream indoor unit model total
10-Branch header (Downstream indoor unit model total
Heat source twinning kit
A Heat source unit
C Indoor unit
E Heat source twinning kit
* The total length of A and A is less than 10 m [32 ft].
1 2
*1 ø12.7 for over 90 m [295-1/4 in]
*2 ø12.7 for over 40 m [131-3/16 in]
*4 The pipe sizes listed in columns A1 to A2 in this table correspond to the sizes
for the models listed in the unit 1 and 2 columns. When the order of the models
for unit 1 and 2 change, make sure to use the appropriate pipe size.
*5 B
*6 C When the height difference between the indoor units is 15 m [49 ft] or
[Fig. 9.2.2] (P.6 - 8)
Heat source model
Low-pressure side
Liquid pipe
Model number
Heat source twinning kit
Low-pressure gas pipe
A Heat source unit
C
E
G Heat source twinning kit
*3 When the piping length is 65 m [213 ft] or longer, use the ø28.58 [1-1/8] pipe
for the part that exceeds 65 m [213 ft].
*4 The pipe sizes listed in columns A1 to A2 in this table correspond to the sizes
for the models listed in the unit 1 and 2 columns. When the order of unit 1 and
2 change, make sure to use the appropriate pipe size for the model.
Liquid side
Total capacity of indoor units
Gas pipe
Downstream unit model total
B 1st branch
D Cap
F Header
High-pressure side
Total capacity of indoor units
Gas pipe
Downstream unit model total
High-pressure gas pipe
B
D
F