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Conditions
(1) When Y, Zubadan, WY, or Replace-Y series models are used for the outdoor
units.
(2) When PWFY-(E)P100/200VM-E1-AU units are used for heating only and are

placed on the same refrigerant circuit as the indoor units or other
PWFY-(E)P100/200VM-E1-AU units.
However, this does not apply in cases where brine is added to the water line or
cases where the unit is run in heating mode only as a refrigerant circuit system.

Set Dip SW3-6 to ON. Make sure the version of the software is 1.18 or later.

[Fig. 7.4.3] (P.4)

8. Refrigerant pipe and drain pipe specifications

To avoid dew drops, provide sufficient antisweating and insulating work to the refrig-
erant and drain pipes.
When using commercially available refrigerant pipes, be sure to wind commercially
available insulating material (with a heat-resisting temperature of more than 100

and thickness given below) onto both liquid and gas pipes.
Be also sure to wind commercially available insulating material (with a form polyeth-
ylene’s specific gravity of 0.03 and thickness given below) onto all pipes which pass
through rooms.

Select the thickness of insulating material by pipe size.

If the unit is used on the highest story of a building and under conditions of high
temperature and humidity, it is necessary to use pipe size and insulating mate-
rial’s thickness more than those given in the table above.

If there are customer’s specifications, simply follow them.

8.1. Refrigerant pipe, drain pipe and filling port

[Fig. 8.1.1] (P.5)

9. Connecting refrigerant pipes and drain pipes

9.1. 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 out-

door 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 fol-

lowing.

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

cap.

[Fig. 9.1.1] (P.5)

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

piping may cause condensation instead of preventing it.

* Before brazing the refrigerant piping,

always wrap the piping on the main body,

and the thermal insulation piping, with damp cloths to prevent heat shrink-
age and burning the thermal insulation tubing

. Take care to ensure that the

flame does not come into contact with the main body itself.

[Fig. 9.1.2] (P.5)

Cautions On Refrigerant Piping



Be sure to use non-oxidative brazing for brazing to ensure that no foreign
matter or moisture enter into the pipe.



Be sure to apply refrigerating machine oil over the flare connection seating
surface and tighten the connection using a double spanner.



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

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 mal-

functions or accidents resulting from the use of the wrong type of refrigerant.

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

than the refrigerant (R407C or R22) 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, shaving
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.

9.2. 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. (

)

F: Fuze