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9. Refrigerant piping installation
The pipe is connected via a terminal-branch type connection in which refrigerant
piping from the heat source unit is branched at the terminal and is connected to
each of the indoor units.
The method of pipe connection is as follows: flare connection for the indoor units,
Gas (low-pressure for PQRY-P·Z(S)KMU-A) pipes and Liquid (high-pressure for
PQRY-P·Z(S)KMU-A) pipes for heat source, brazed connection. Note that the
branched sections are brazed.
Warning:
Do not use refrigerant other than the type indicated in the manuals
provided with the unit and on the nameplate.
- Doing so may cause the unit or pipes to burst, or result in explosion or fire
during use, during repair, or at the time of disposal of the unit.
- It may also be in violation of applicable laws.
- MITSUBISHI ELECTRIC CORPORATION cannot be held responsible
for malfunctions or accidents resulting from the use of the wrong type of
refrigerant.
Always use extreme care to prevent the refrigerant gas from leaking while
using fire or flame. If the refrigerant gas comes in to contact with a flame
from any source, such as a gas stove, it breaks down and generates
a poisonous gas which can cause gas poisoning. Never weld in an
unventilated room. Always conduct an inspection for gas leakage after
installation of the refrigerant piping has been completed.
9.1. Caution
This unit uses refrigerant R410A. Follow the local regulations on materials and
pipe thickness when selecting pipes. (Refer to the table below.)
1 Use the following materials for refrigeration piping.
•
Material: Use copper alloy seamless pipes made of phosphorus
deoxidized copper. Ensure the inside and outside surfaces of
the pipes are clean and free from hazardous sulfur, oxide, dusts,
shaving particles, oils, and moisture (contamination).
•
Size: Refer to item 9.2. for detailed information on refrigerant piping
system.
2 Field-supplied piping often contains dust and other materials. Always blow it
clean with a dry inert gas.
3 Use care to prevent dust, water or other contaminants from entering the
piping during installation.
4 Reduce the number of bending portions as much as possible, and make
bending radii as big as possible.
5 For branching and connecting pipes for indoor and heat source units, use
the following twinning and connecting pipe sets (sold separately).
Indoor twinning pipe
Indoor junction pipe
kit model PQRY-
kit model PQRY-
P·Z(S)KMU-A ONLY
P·Z(S)KMU-A ONLY
Line branch
Total indoor model
Down-stream unit
model
P72~P96
Less than 30 in total
CMY-Y102SS-G2
CMY-R160C-J
Copper pipe size and radial thickness for R410A CITY MULTI.
Radial thickness
Size (mm) Size (inch)
(mm)
ø6.35
ø1/4"
0.8
ø9.52
ø3/8"
0.8
ø12.7
ø1/2"
0.8
ø15.88
ø5/8"
1.0
*ø19.05
ø3/4"
1.2
*ø19.05
ø3/4"
1.0
ø22.2
ø7/8"
1.0
ø25.4
ø1"
1.0
ø28.58
ø1-1/8"
1.0
ø31.75
ø1-1/4"
1.1
ø34.93
ø1-3/8"
1.2
ø41.28
ø1-5/8"
1.4
* Both pipe types can be used for pipe size ø19.05 (3/4 inch) for R410A air
conditioner.
6 Use a fitting if a specified refrigerant pipe has a different diameter from that
of a branching pipe.
Heat source twinning
kit model PQRY-
P·Z(S)KMU-A ONLY
Total heat source
model
P144 ~ P240
CMY-Z100CBK
Radial thickness
Pipe type
(mil)
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
7 Follow the restrictions on the refrigerant piping (such as rated length, height
difference, and piping diameter) to prevent equipment failure or a decline in
heating/cooling performance.
Indoor twinning pipe set model PQHY-P·Z(S)KMU-A ONLY
Line branch
Down-stream unit
Down-stream unit
model
model
More than 73 and
Less than 72 in
less than 144 in
total
total
CMY-Y102SS-G2
CMY-Y102LS-G2
Indoor twinning pipe set model PQHY-P·Z(S)KMU-A ONLY
Header branch
4 branching
8 branching
CMY-Y104C-G
CMY-Y108C-G
Heat source twinning kit model PQHY-P·Z(S)KMU-A ONLY
Total heat source model
Total heat source model
P144 ~ P240
CMY-Y100CBK3
8 Indoor units cannot be further branched down stream after the branch
header. (See diagram below.) *PQHY-P·Z(S)KMU-A ONLY.
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
on refrigerant piping system).
0 Charge the system using liquid refrigerant.
a Never use refrigerant to air purge. Always evacuate using a vacuum
pump.
b Always insulate the piping properly. Insufficient insulation will result in
a decline in heating/cooling performance, condensation and other such
problems (Refer to item 10.4 for insulation of the refrigerant piping).
c When connecting the refrigerant piping, make sure the valve of the heat
source unit is completely closed (the factory setting) and do not operate
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.
(Refer to item 10.2. for details of the piping connection and valve operation)
e Never perform piping connections when raining.
Warning:
When installing and relocating the unit, do not charge the system with any
other refrigerant other than what is specified.
- Mixing different refrigerant, air, etc. may cause the refrigerant cycle to
malfunction and result in severe damage.
Down-stream unit
Down-stream unit
model
model
More than 145
More than 241 in
and less than 240
total
in total
CMY-Y202S-G2
CMY-Y302S-G2
10 branching
CMY-Y1010C-G
P264 ~ P360
CMY-Y300CBK2
CAP
1
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