Mitsubishi Electric PURY-RP200YJM-A [12/31] Installation of unit

9. Refrigerant piping installation

The pipe is connected via a terminal-branch type connection in which refrigerant

piping from the outdoor unit is branched at the terminal and is connected to each

of the indoor units.

The method of pipe connection is as follows: ﬂ are connection for the indoor

units, low-pressure pipes and high-pressure pipes for outdoor units, brazed

connection. Note that the branched sections are brazed.

Warning:

Always use extreme care to prevent the refrigerant gas from leaking while

using ﬁ re or ﬂ ame. If the refrigerant gas comes in to contact with a ﬂ ame

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.

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.

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 inner and outer 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 Commercially available 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 indoor and outdoor branching and merging section, be sure to use the

following twinning pipe sets and merge pipe sets (sold separately).

Indoor junction pipe kit

model

Total indoor model

P100 ~ P250

CMY-R160-J1

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6 Use a ﬁ tting if a speciﬁ ed 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 decline in heating/cooling performance.

8 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 servicing, 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 information on refrigerant piping system).

9 Be sure to charge the system using liquid refrigerant.

0 Never use refrigerant to perform an air purge. Always evacuate using a

vacuum pump.

a Always insulate the piping properly. Insufﬁ cient insulation will result in a

decline in heating/cooling performance, water drops from condensation and

other such problems (Refer to item 10.4 for thermal insulation of refrigerant

piping).

b 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, indoor units and BC controller has

been connected, a refrigerant leakage test has been performed and the

evacuation process has been completed.

c Braze only with non-oxide brazing material for piping. Failure to do so

may damage the compressor. Be sure to perform the non-oxidation

brazing 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)

d 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 speciﬁ ed on the unit.

- Mixing of a different refrigerant, air, etc. may cause the refrigerant cycle to

malfunction and may result in severe damage.

Caution:

Use a vacuum pump with a reverse ﬂ ow check valve.

- If the vacuum pump does not have a reverse ﬂ ow check valve, the vacuum

pump oil may ﬂ ow back into the refrigerant cycle and cause deterioration of

the refrigerant oil.

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8.1. Installation

[Fig. 8.1.1] (P.3)

<A> Without detachable leg <B> With detachable leg

M10 anchor bolt procured at the site.

Corner is not seated.

Fixing bracket for the hole-in anchor

bolt (3 locations to ﬁ x with screws).

Detachable leg

Fix unit tightly with bolts so that unit will not fall down due to earthquakes or

strong winds.

Use concrete or an angle bracket for the foundation of unit.

Vibration may be transmitted to the installation section and noise and

vibration may be generated from the ﬂ oor and walls, depending on the

installation conditions. Therefore, provide ample vibrationprooﬁ ng (cushion

pads, cushion frame, etc.).

Be sure that the corners are ﬁ rmly seated. If the corners are not ﬁ rmly

seated, the installation feet may be bent.

When using cushion pads, be sure that the full width of the unit is covered.

The projecting length of the anchor bolt should be less than 30 mm.

Hole-in anchor bolts are not compatible with this product. However, if ﬁ xing

brackets are mounted on the 4 locations of the unit attachment part, hole-in

anchor bolts can be used.

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[Fig. 8.1.2]

Screws

The detachable leg can be removed at the site.

Detaching the detachable leg

Loosen the three screws to detach the detachable leg (Two each in the front

and back).

If the base leg ﬁ nish is damaged when detaching, be sure to repair at the

site.

Warning:

Be sure to install unit in a place strong enough to withstand its weight.

Any lack of strength may cause unit to fall down, resulting in a

personal injury.

Have installation work in order to protect against strong winds and

earthquakes.

Any installation deﬁ ciency may cause unit to fall down, resulting in a

personal injury.

When building the foundation, give full attention to the ﬂ oor strength, drain water

disposal <during operation, drain water ﬂ ows out of the unit>, and piping and

wiring routes.

Precautions when routing the pipes and wires below the unit (Without

detachable leg)

When routing the pipes and wires below the unit, be sure that the foundation and

base work do not block the base through-holes. Also make sure the foundation

is at least 100 mm high so that the piping can pass under the unit.

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8. Installation of unit

Mitsubishi Electric PURY-RP200YJM-A [12/31] Installation of unit

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