Mitsubishi Electric CITY MULTI CMY-R100CBK2 User manual

Mitsubishi Electric Air Conditioner CITY MULTI

CMY-R100CBK2

Twinning Kit Installation Manual

•For your safety, thoroughly read the following instructions prior to installation.

Safety Precautions

•Thoroughly read the following “Safety Precautions” to ensure proper installation.

•Observe the following important safety precautions at all times.

•Hazards that can occur from incorrect handling are classified by the symbols below:

WARNING

CAUTION

Incorrect handling can result in death or serious injury.

Incorrect handling can result in bodily injury and/or structure damage.

WARNING

CAUTION

Only a dealer or qualiﬁed technician should

perform installation.

Properly install all parts according to the

instructions in the Installation Manual.

After installation, check for a refrigerant leak.

Do not make any modiﬁcations or alterations.

Consult your dealer for repair.

When installing or relocating the unit, check that

no substance other than the speciﬁed refrigerant

(R410A) enters the refrigerant circuit.

Do not touch the refrigerant pipes and refrigerant

circuit components with bare hands during and

immediately after operation.

In the event of a refrigerant leak, thoroughly

ventilate the room.

•Improper installation may result in refrigerant gas leakage and

equipment damage.

•If the wrong twinning pipe or wrong size connecting pipe is used,

air conditioning performance will suffer.

•If leaked refrigerant comes in contact with a heat source, such

as a fan heater, stove, or electric grill, toxic gases will be

generated.

•Improper installation may result in water leakage, electric shock,

or ﬁre. •Any presence of foreign substance or air can cause abnormal

pressure rise or explosion.

•During or immediately after operation, certain parts of the unit

such as pipes and compressor may be either very cold or hot,

depending on the state of the refrigerant in the unit at the time.

To reduce the risk of frostbites and burns, do not touch these

parts with bare hands.

•If refrigerant leaks and comes in contact with an open ﬂame,

toxic gases will be generated.

Properly dispose of packing materials.

•Plastic bags can pose suffocation and choking hazards: keep

them out of the reach of children. Tear the plastics bags before

disposing of them.

* See the Installation Manual that came with the outdoor unit for installation instructions.

WT06631X01

2. Selecting the Correct Size Refrigerant Pipes and Using the Twinning Kit

(1) Pipe size

1Field-supply the pipes to be connected to the kit.

2Select the correct size pipe referring to the outline diagram of

the unit model in use or the Databook.

3If the pipe was cut with a pipe cutter, remove the burrs and

eliminate foreign materials before connecting.

* On the low-pressure side, the twinning kit connects to the ﬁeld-

supplied pipes inside the outdoor unit.

The distributor on the low-pressure side must be placed in the

outdoor unit that has a larger capacity index of the two, regardless

of the relative positions of the outdoor units or their addresses.

If the distributor is placed in the outdoor unit that has a smaller

capacity, refrigerant will not be properly distributed and compressor

failure may result.

(If outdoor units that have the same capacity are used in

combination, the distributor can be placed in either outdoor unit.)

Outdoor unit 1 Outdoor unit 2

To BC controller

Twinning pipe (high pressure)

1. Conﬁrming the Package Contents

The following items are included with the Twinning Kit (CMY-R100CBK2). Verify that all items are present before starting installation.

* Always use the twinning pipes included in the kit when preparing the twinning kit.

If the ﬁeld-supplied pipes do not ﬁt the parts in the kit, use the accessory piping parts listed below.

(1) Package contents

Model

1Low-pressure

twinning kit

2High-pressure

twinning pipe 3Fixing screw 4Elbow pipe

ø22.2 [7/8]

5Elbow pipe

ø28.58 [1-1/8]

6OD15.88 [5/8]

-ID19.05 [3/4]

7High-pressure

pipe

(for routing

through the bottom)

8High-pressure

pipe (for routing

through the front)

9Pipe cover 0OD19.05 [3/4]

-ID15.88 [5/8]

CMY-R100CBK2 1 1 2 1 1 1 1 1 1 3

Model

aOD22.2 [7/8]

-ID19.05 [3/4]

bOD19.05 [3/4]

-ID22.2 [7/8]

cU-PIPE

ID25.4 [1] dSaddle ePacking f Fixing plate

gInstallation

Manual

(this booklet)

hInsulation

cover iCable tie

CMY-R100CBK2 1 1 1 1 1 1 1 1 2

(2) List of ﬁeld-supplied parts

· Refrigerant pipes other than the ones provided in the kit.

· Heat-resistant insulation material (for field-supplied refrigerant pipes)

· Insulation cover tape

Twinning Kit (low pressure)

See reverse.

(2) Low-pressure twinning kit in CMY-R100CBK2

Use cin table "(1) Package Contents." Attach items d, e,

and fto the stop valve sheet metal and then to the low-

pressure twinning kit to hold it into place.

1. Attach item fto the stop valve sheet metal.

2. Attach the packing and saddle.

3. Secure the low pressure twinning kit.

(3) Routing the pipe through the bottom

(1) Braze item 7high-pressure pipe to the refrigerant service valve so

that the dimples on the pipe are parallel to the edge of the cutout

hole. Expand the end of the ﬁeld-supplied pipes, and braze them to

item 7high-pressure pipe.

(2) Attach item 1low-pressure twinning kit to the sheet metal of the

refrigerant service valve with item 3screw, and braze it to the

refrigerant service valve.

(3) Braze item 5elbow pipe to the ﬁeld-supplied pipe ﬁrst, and then

braze it to item 1low-pressure twinning kit.

(4) Flare the ﬁeld-supplied pipe end, and braze the pipe to the low-

pressure pipe in the middle.

(5) Wrap the pipe in front of item 1low-pressure twinning kit with item

9pipe cover, and attach compressor cables to item 9pipe cover

with item icable tie to keep them out of direct contact with the

pipes.

(4) Routing the pipe through the front

(1) Braze item 8high-pressure pipe to the refrigerant service valve.

(2) Attach item 1low-pressure twinning kit to the sheet metal of the

refrigerant service valve with item 3screw, and braze it to the

refrigerant service valve.

(3) Braze item 5elbow pipe to the ﬁeld-supplied pipe ﬁrst, and then

braze it to item 1low-pressure twinning kit.

(4) Braze item 4elbow pipe to the low-pressure pipe in

the middle.

(5) Wrap the pipe in front of item 1low-pressure twinning kit with item

9pipe cover, and attach compressor cables to item 9pipe cover

with item icable tie to keep them out of direct contact with the

pipes.

(5) Slope of twinning pipes (high-pressure side only)

Make sure the slope of the twinning pipes are at an angle

within ±15˚ to the horizontal plane.

If the slope exceeds the speciﬁed angle, the unit may be

damaged.

Note. Refer to the ﬁgure below for the installation position of the twinning pipe.

· Before heating the pipes, place a wet towel on the refrigerant service

valve to keep its temperature below 120

˚C [248˚F]

· Direct the flame away from the cables and sheet metals inside the unit

so as not to burn them.

CAUTION

· Before heating the pipes, place a wet towel on the refrigerant service

valve to keep its temperature below 120

˚C [248˚F]

· Direct the flame away from the cables and sheet metals inside the unit

so as not to burn them.

CAUTION

d,e,f

Section to be brazed locally

Connect the pipe so that the

dimples on the 7high pressure

pipe are parallel to the edge of

the cutout hole.

Wrap the pipe cover here.

Attach compressor cables to pipe

cover with cable tie to keep them

out of direct contact with the pipes.

Wrap the pipe cover here.

Attach compressor cables to pipe

cover with cable tie to keep them

out of direct contact with the pipes.

Field-supplied pipes

Field-supplied

pipes

Field-supplied pipes

±15˚

Twinning pipe on the high-pressure side

Slope of the twinning pipe is at an angle within ±15° to the horizontal plane.

Refrigerant

service valve

5. Miscellaneous Notes

Secure the ﬁeld-supplied pipes with a pipe cover and a cable tie in place to keep them from coming in contact with other pipes as

necessary.

WT06631X01

See reverse.

4. Insulation Cover Installation

Install the insulation cover on the twinning kit after brazing the pipes and twinning kit.

Insulate all refrigerant pipes. Insulate the high-pressure and low-pressure pipes separately, and pipes located inside the unit as well as

the outside. Use heat-resistant insulation material (Heat resistant : at least 120°C [248°F], Thickness: high-pressure = 10 mm [13/32 in],

low-pressure = 20 mm [13/16 in] ). Position the edges of the insulation cover and heat-resistant insulation material so as not to leave a

gap, and then wrap the exterior perimeter of the pipe joints and middle with tape (ﬁeld-supplied).

3. Pipe Connection Example

Connect the pipes between outdoor units, referencing

the ﬁgure below.

1Low-pressure twinning kit

2High-pressure twinning pipe

Low-pressure connecting pipe

(ﬁeld-supplied)

High-pressure connecting pipe

(ﬁeld-supplied)

Main high-pressure pipe (ﬁeld-supplied)

Main low-pressure pipe (ﬁeld-supplied)

Tape (ﬁeld-supplied)

Insulation cover Heat-resistant insulation material (ﬁeld-supplied)

Tape (ﬁeld-supplied)

Insulation covers can shrink.

Overlap the tape as shown in the

left ﬁgure so that there will be no

gap in between the insulation cover

or ﬁeld-installed insulation material.

(6) The length of the straight pipe between indoor units and the twinning pipe (high-pressure pipe)

Use the pipes supplied in the twinning kit, and make sure the section of the ﬁeld-supplied pipe that connects to the twinning

pipe has at least 500 mm [19-11/16 in] of straight section. (The section of the ﬁeld-supplied pipe that connects to the twinning

pipe must have at least 500 mm [19-11/16 in] of straight section.) If the straight section is less than 500 mm [19-11/16 in], it

may result in equipment damage.

(7) Pipe connection (high-pressure side)

· Make sure the pipes from the twinning pipe to the outdoor unit are sloped downwards.

A B

To BC controller

High-pressure twinning pipe

Total pipe length = A + B < 5 m [16-7/16 ft]

· If high-pressure twinning pipe is installed above the base of

the outdoor unit, it should be no more than 200 mm [7-7/8 in].

To BC controller

BC controller

Upward slope

Downward slope

100 mm

[3-15/16 in]

or more

200 mm

[7-7/8 in]

max.

High-pressure

twinning pipe

Outdoor unit 1 Outdoor unit 2

Heat-resistant insulation material (ﬁeld-supplied)

To be gap free

ﬁeld-supplied pipe

hInsulation cover

2High-pressure

twinning pipe

Overlap margin of the tape

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