Precautions Concerning Piping Connection And Valve Operation - Mitsubishi Electric PUHY-P72ZKMU-A(-BS) Manuel D'installation

Value of
Total capacity of connecting indoor units
Models ~ 27
Models 28 ~ 54
Models 55 ~ 126
Models 127 ~ 144
Models 145 ~ 180
Models 181 ~ 234
Models 235 ~ 273
Models 274 ~ 307
Models 308 ~ 342
Models 343 ~ 411
Models 412 ~ 480
Models 481 ~
<Amount of factory charged refrigerant>
Outdoor unit model Charged amount
P72 9.0 kg
P96 11.5 kg
P120 11.8 kg
P144 11.8 kg
10.2. Precautions concerning piping
connection and valve operation
Conduct piping connection and valve operation accurately and carefully.
Removing the pinched connecting pipe
When shipped, a pinched connecting pipe is attached to the on-site liquid
and gas valves to prevent gas leakage.
Take the following steps 1 through 4 to remove the pinched connecting
pipe before connecting refrigerant pipes to the outdoor unit.
1 Check that the refrigerant service valve is fully closed (turned clockwise
all the way).
2 Connect a charging hose to the service port on the liquid/gas refrigerant
service valve, and extract the gas in the pipe section between the
refrigerant service valve and the pinched connecting pipe.
3 After vacuuming gas from the pinched connecting pipe, sever the
pinched connecting pipe at the location shown in [Fig.10.2.1] and drain
the refrigerant.
4 After completing 2 and 3 heat the brazed section to remove the
pinched connecting pipe.
[Fig. 10.2.1]
<A> <B>
D
A
E B
O S
G
C
D
F
<A> Refrigerant service valve (liquid side/brazed type)
<B> Refrigerant service valve (gas side/brazed type)
A
Shaft
Fully closed at the factory, when connecting the piping, and when
vacuuming. Open fully after these operations are completed.
<When opening>
<When closing>
B
Shaft
Fully closed at the factory, when connecting the piping, and when
vacuuming.
Open fully after these operations are completed.
<When opening>
<When closing>
C
Stopper pin
14
2.0 kg [71 oz]
2.5 kg [89 oz]
3.0 kg [106 oz]
3.5 kg [124 oz]
4.5 kg [159 oz]
5.0 kg [177 oz]
Warning:
6.0 kg [212 oz]
8.0 kg [283 oz] The sections between the refrigerant service valves and the pinched
9.0 kg [318 oz]
and refrigerant oil in the above-mentioned pipe section before heating
10.0 kg [353 oz]
the brazed section to remove the refrigerant service valve pinched
12.0 kg [424 oz]
connecting pipe.
14.0 kg [494 oz]
Caution:
Place a wet towel on the refrigerant service valve before heating the
brazed section to keep the temperature of the valve from exceeding
to prevent heat damage.
Caution:
Do not vent R410A into the atmosphere.
Refrigerant pipe connection
This product needs connecting pipes for front piping and bottom post-piping.
(Refer to [Fig.10.2.2])
Check the liquid/gas piping dimensions before connecting the refrigerant
pipe.
Refer to the table below for piping dimensions.
Make sure that the refrigerant pipe is not touching other refrigerants pipes,
unit panels, or base plates.
Be sure to use non-oxidative brazing when connecting pipes.
Be careful not to burn the wiring and plate when brazing.
<Refrigerant piping connection examples>
[Fig.10.2.2]
Model
P72
P96
P120
P144
*1 Expand the on-site piping and connect to the refrigerant service valve piping.
piping.
*3 In the case the unit is used in combination with other outdoor units.
*4 Furthest piping length (OU from IU)
*5 Furthest piping length (OU from IU)
D
Service port
Available for gas venting of the pinched connecting pipe, or vacuuming in the
refrigerant pipes on the site.
E
Cap
Remove the cap before operating the shaft. Be sure to return it to the original
position after completing the operation.
F
Pinched connecting pipe severing portion
G
Pinched connecting pipe brazing portion
refrigerant oil, the pipe may burst or the pinched connecting pipe may blow
off and ignite the refrigerant oil, causing serious injury.
<A>
<C> <D>
A
B
C
D
E
F
<A> Front pipe routing
<C> Liquid side
A
Refrigerant service valve piping
B
On-site piping (Adjust the pipe's position to the knockout hole.)
C
Elbow
D
Reducer etc.
E
On-site piping (gas connecting pipe)
F
On-site piping (liquid connecting pipe)
Diameter
Refrigerant pipe
Liquid
ø9.52 [3/8] Brazed *1
ø22.2 [7/8]
ø9.52 [3/8] Brazed *1
(ø12.7 [1/2] Brazed) *2, *4
ø9.52 [3/8] Brazed *2
ø28.58 [1-1/8]
(ø12.7 [1/2] Brazed) *1, *3, *5
ø12.7 [1/2] Brazed *1
90 m [295 ft]
40 m [131 ft]
<B>
<C> <D>
A
D
E
F
<B> Bottom pipe routing
<D> Gas side
(Unit: mm [in])
Service valve
Gas Liquid Gas
ø9.52
Brazed *2 [3/8]
ø28.58
[1-1/8]
ø12.7
Brazed *1 [1/2]