Mitsubishi Electric PFFY-P50VLRMM-E [8/11] Connecting refrigerant pipes and drain pipes

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PGRRUTR

Warning:

When installing and moving the unit, do not charge it with refrigerant other

than the refrigerant specified on the unit.

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

function and result in severe damage.

Caution:

• Use refrigerant piping made of C1220 (Cu-DHP) phosphorus deoxidized

copper as specified in the JIS H3300 “Copper and copper alloy seamless

pipes and tubes”. In addition, be sure that the inner and outer surfaces of

the pipes are clean and free of hazardous sulphur, oxides, dust/dirt, shav-

ing particles, oils, moisture, or any other contaminant.

• Never use existing refrigerant piping.

- The large amount of chlorine in conventional refrigerant and refrigerator oil

in the 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 gets into the refrigerant cycle, the oil will deteriorate and

the compressor may fail.

• The refrigerant used in the unit is highly hygroscopic and mixes with

water and will degrade the refrigerator oil.

6.2. Drain piping work

1. Ensure that the drain piping is downward (pitch of more than 1/100) to the

outdoor (discharge) side. Do not provide any trap or irregularity on the way.

2. Ensure that any cross-wise drain piping is less than 20 m (excluding the differ-

ence of elevation). If the drain piping is long, provide metal braces to prevent it

from waving. Never provide any air vent pipe. Otherwise drain may be ejected.

3. Put the supplied strainer at the bottom of the sub drain pan on the side of the

body frame, and connect the supplied drain hose to the end connection. Tighten

this end connection using the supplied hose hand.

4. Use a VP30 pipe or equivalent for collecting pipe if it is needed, and pipe it

giving a downward pitch of more than 1/100.

5. Provide sufficient insulation just as for refrigerant piping.

[Fig. 6.2.1] (P.3)

A Indoor unit B Strainer (accessory)

C Sub drain pan D Hose band (accessory)

E Drain hose (accessory)

Caution:

Pipe the drain piping to ensure that it discharges drain, and insulate it to

prevent dew condensation. A failure to the piping work may cause water

leakage and so wet your property.

7. Electrical wiring

6. Connecting refrigerant pipes and drain pipes

6.1. Refrigerant piping work

This piping work must be done in accordance with the installation manuals for both

outdoor unit and BC controller (simultaneous cooling and heating series R2).

• Series R2 is designed to operate in a system that the refrigerant pipe from an

outdoor unit is received by BC controller and branches at the BC controller to

connect between indoor units.

• For constraints on pipe length and allowable difference of elevation, refer to

the outdoor unit manual.

• The method of pipe connection is brazing connection.

Caution:

• Install the refrigerant piping for the indoor unit in accordance with the

following.

1. Cut the tip of the indoor unit piping, remove the gas, and then remove the

brazed cap.

[Fig. 6.1.1] (P.3)

A Cut here

B Remove brazed cap

2. Pull out the thermal insulation on the site refrigerant piping, braze the unit

piping, and replace the insulation in its original position.

Wrap the piping with insulating tape.

Note:

• When blazing the refrigerant pipes, be sure to blaze, after covering a wet

cloth to the pipes of the units in order to prevent it from burning and

shrinking by heat.

[Fig. 6.1.2] (P.3)

A Cool by a wet cloth

• Pay strict attention when wrapping the copper piping since wrapping the

piping may cause condensation instead of preventing it.

[Fig. 6.1.3] (P.3)

A Thermal insulation B Pull out insulation

C Wrap with damp cloth D Return to original position

E Ensure that there is no gap here F Wrap with insulating tape

Cautions On Refrigerant Piping

s Be sure to use non-oxidative brazing for brazing to ensure that no for-

eign matter or moisture enter into the pipe.

s Be sure to apply refrigerating machine oil over the flare connection seat-

ing surface and tighten the connection using a double spanner.

s Provide a metal brace to support the refrigerant pipe so that no load is

imparted to the indoor unit end pipe. This metal brace should be pro-

vided 50 cm away from the indoor unit’s flare connection.

Precautions on electrical wiring

Warning:

Electrical work should be done by qualified electrical engineers in accord-

ance with “Engineering Standards For Electrical Installation” and supplied

installation manuals. Special circuits should also be used. If the power cir-

cuit lacks capacity or has an installation failure, it may cause a risk of elec-

tric shock or fire.

1. Be sure to take power from the special branch circuit.

2. Be sure to install an earth leakage breaker to the power.

3. Install the unit to prevent that any of the control circuit cables (remote control-

ler, transmission cables) is brought in direct contact with the power cable out-

side the unit.

4. Ensure that there is no slack on all wire connections.

5. Some cables (power, remote controller, transmission cables) above the ceiling

may be bitten by mouses. Use as many metal pipes as possible to insert the

cables into them for protection.

6. Never connect the power cable to leads for the transmission cables. Otherwise

the cables would be broken.

7. Be sure to connect control cables to the indoor unit, remote controller, and the

outdoor unit.

8. Put the unit to the ground on the outdoor unit side.

9. Select control cables from the conditions given in page

Caution:

Be sure to put the unit to the ground on the outdoor unit side. Do not con-

nect the earth cable to any gas pipe, water pipe, lightening rod, or telephone

earth cable. Incomplete grounding may cause a risk of electric shock.

Types of control cables

1. Wiring transmission cables

• Types of transmission cables

Design wiring in accordance with the following table <Table 1>.

• Cable diameter

More than 1.25 mm

WT05228X01_en 07.8.7, 3:13 PM8

Mitsubishi Electric PFFY-P50VLRMM-E [8/11] Connecting refrigerant pipes and drain pipes

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