Mitsubishi Electric PURY-P350YJM-A [18/39] Precautions concerning piping connection and valve operation

[Fig.10.2.2] (P.7)

Connecting pipe (ID ø25.4, ID ø22.2) <Included with outdoor unit>

Connecting pipe (ID ø25.4, OD ø19.05) <Included with outdoor unit>

Connecting pipe (ID ø25.4, ID ø28.58) <Included with outdoor unit>

Connecting elbow (ID ø19.05, OD ø19.05) <Included with outdoor unit>

Connecting elbow (ID ø28.58, OD ø28.58) <Included with outdoor unit>

<A> Front pipe routing <B> Bottom pipe routing

<C> Low-pressure side <D> High-pressure side

<E> Severing portion referral ﬁ gure

Shape

When not attaching a low-pressure twinning pipe

When attaching a low-pressure twinning pipe

Refrigerant service valve piping

On-site piping (low-pressure connecting pipe)

On-site piping (high-pressure connecting pipe)

Twinning kit (sold separately)

On-site piping (low-pressure connecting pipe: to BC controller)

On-site piping (low-pressure connecting pipe: to outdoor unit)

75 mm (reference measurement)

ID ø25.4 side

Severing portion

*1 For the attachment of the Twinning pipe (sold separately), refer to

the instructions included in the kit.

*2 Connection pipe is not used when the Twinning Kit is attached.

*3 Use a pipe cutter to sever.

Front pipe routing

P200, EP200

P250, P300

EP250, EP300,

P350, EP350

P400, P450

: Expand the high-pressure side on-site piping

(IDø15.88) and connect to the refrigerant service

valve piping.

: Expand the high-pressure side on-site piping

(IDø19.05) and connect to the refrigerant service

valve piping.

: Use the included connecting pipe 2 and elbow

4 to connect.

: Use the included connecting pipe 1 to connect.

P200, EP200

P250, P300,

EP250, EP300

P350, P400

EP350, P450

: Expand the low-pressure side on-site piping

(IDø19.05) and connect to the refrigerant service

valve piping.

: Use the included connecting pipe 1 to connect.

: Use the included connecting pipe 3 to connect.

: Use the included connecting elbow 5 to connect.

Bottom pipe routing

P200, EP200

P250, P300

EP250, EP300,

P350, EP350

P400, P450

: Expand the high-pressure side on-site piping

(IDø15.88) and connect to the refrigerant service

valve piping.

: Expand the high-pressure side on-site piping

(IDø19.05) and connect to the refrigerant service

valve piping.

: Use the included connecting pipe 2. Expand the

on-site piping to connect to ID ø 19.05.

: Sever the included connecting pipe 1 as shown

in the ﬁ gure with a pipe cutter to use. Expand the

on-site piping to connect to ID ø 22.2.

P200, EP200

P250, P300,

EP250, EP300

P350, P400

EP350, P450

: Expand the low-pressure side on-site piping

(IDø19.05) and connect to the refrigerant service

valve piping.

: Sever the included connecting pipe 1 as shown

in the ﬁ gure with a pipe cutter to use. Expand the

on-site piping to connect to IDø22.2.

: Sever the included connecting pipe 3 as shown

in the ﬁ gure with a pipe cutter to use. Expand the

on-site piping to connect to IDø28.58.

: Expand the low-pressure side on-site piping

(IDø28.58) and connect to the refrigerant service

valve piping.

Satisfy the minimum insertion depth in the table below when expanding on-site

piping

Pipe diameter (mm) Minimum insertion depth (mm)

5 or more less than 8 6

8 or more less than 12 7

12 or more less than 16 8

16 or more less than 25 10

25 or more less than 35 12

35 or more less than 45 14

•

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 high-

pressure and low-pressure 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 low-pressure/

high-pressure 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] (P.6)

<A> Refrigerant service valve (high-pressure side/brazed type)

<B> Refrigerant service valve (low-pressure side/brazed type)

Shaft

Fully closed at the factory, when connecting the piping, and when

vacuuming. Open fully after these operations are completed.

• Turn the shaft counterclockwise with a hexagonal wrench.

• Turn around the shaft until it stops.

• Turn the shaft clockwise with a hexagonal wrench.

• Turn around the shaft until it stops.

Shaft

Fully closed at the factory, when connecting the piping, and when

vacuuming. Open fully after these operations are completed.

• Turn the shaft counterclockwise.

• Turn around the shaft until it stops.

• Turn the shaft clockwise.

• Turn around the shaft until it stops.

Stopper pin

Prevents the shaft from turning 90° or more.

Service port

Available for gas venting of the pinched connecting pipe, or vacuuming in the

refrigerant pipes on the site.

Cap

Remove the cap before operating the shaft. Be sure to return it to the original

position after completing the operation.

Pinched connecting pipe severing portion

Pinched connecting pipe brazing portion

Warning:

The sections between the refrigerant service valves and the pinched

connecting pipes are ﬁ lled with gas and refrigerant oil. Extract the gas

and refrigerant oil in the above-mentioned pipe section before heating

the brazed section to remove the refrigerant service valve pinched

connecting pipe.

- If the brazed section is heated without ﬁ rst extracting the gas and

refrigerant oil, the pipe may burst or the pinched connecting pipe may blow

off and ignite the refrigerant oil, causing serious injury.

Caution:

Place a wet towel on the refrigerant service valve before heating the brazed

section to keep the temperature of the valve from exceeding 120 ˚C.

Direct the ﬂ ame away from the wiring and metal sheets inside the unit

to prevent heat damage.

Caution:

Do not vent R410A into the atmosphere.

R410A is a Fluorinated Greenhouse gas, covered by the Kyoto

Protocol, with a Global Warming Potential (GWP) = 1975.

Refrigerant pipe connection

This product includes connecting pipes for front piping and bottom post-

piping. (Refer to [Fig.10.2.2])

Check the high-pressure/low-pressure piping dimensions before connecting

the refrigerant pipe.

Refer to item 9.2 Refrigerant piping system 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.

•

WT05963X01_GB.indd 18WT05963X01_GB.indd 18 2010/08/26 20:39:472010/08/26 20:39:47

Mitsubishi Electric PURY-P350YJM-A [18/39] Precautions concerning piping connection and valve operation

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