Mitsubishi CMY-Q100VBK Installation Manual

When installing or relocating the unit, check
that no substance other than the specified
refrigerant (R410A) enters the refrigerant circuit.

¡Any presence of foreign substance or air can cause abnormal

pressure rise or explosion.

¡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:

Mitsubishi Electric Air Conditioner CITY MULTI
Twinning Kit Installation Manual

WARNING

CAUTION

WARNING

Incorrect handling can result in death or serious injury.

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

❈

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

CAUTION

Only a dealer or qualified technician should
perform installation.

¡Improper installation may result in refrigerant gas leakage

and equipment damage.

Do not make any modifications or alterations.
Consult your dealer for repair.

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

or fire.

In the event of a refrigerant leak, thoroughly
ventilate the room.

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

toxic gases will be generated.

Properly install all parts according to the
instructions in the Installation Manual.

¡If the wrong twinning pipe or wrong size connecting pipe is

used, air conditioning performance will suffer.

After installation, check for a refrigerant leak.

¡If leaked refrigerant comes in contact with a heat source,

such as a fan heater, stove, or electric grill, 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.

Do not touch the refrigerant pipes and
refrigerant circuit components with bare
hands during and immediately after operation.

¡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.

1

CMY-Q100VBK

WT05688X01

Twinning pipe(high pressure)

c

e

d

a

b

To BC controller

To BC controller

Twinning kit(low pressure)

Heat source unit 1 Heat source unit 2

1780

20

880 880

1. Confirming the Package Contents

The following items are included with the Twinning Kit (CMY-Q100VBK). 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

CMY-Q100VBK

Model

CMY-Q100VBK

1

1

1

1

1

1

1

1

1

1

1

2

1

1

Low-pressure

twinning kit

2

High-pressure

twinning pipe

3Fixing screw

4Elbow pipe

Ø22.2 [7/8]

5Elbow pipe

Ø28.58 [1-1/8]

6

High-pressure

pipe

7Pipe cover

1

D

ID22.2 [7/8]

-ID25.4 [1]

B

Insulation cover

A

Installation Manual

(this booklet)

0

OD22.2 [7/8]

-ID25.4 [1]

9

OD22.2 [7/8]

-ID19.05 [3/4]

8

OD19.05 [3/4]

-ID15.88 [5/8]

CCable tie

(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

CMY-Q100VBK

PQRY-P600YSHM-A
PQRY-P300YHM-A
PQRY-P300YHM-APQRY-P250YHM-A

PQRY-P250YHM-A

PQRY-P500YSHM-A

Low pressure

Twinning pipe connection size

Heat Source unit 1

Component unit name

Package unit name

BC controller~Twinning pipe

a
b

PQRY-P400YSHM-A
PQRY-P200YHM-A
PQRY-P200YHM-A

High pressure

Low pressure

c
d

High pressure

e

High pressure

Twinning pipe Kit(optional parts)

Twinning pipe~Heat Source unit 1
Twinning pipe~Heat Source unit 2
Twinning pipe~Heat Source unit 2

Heat Source unit 2

PQRY-P450YSHM-A
PQRY-P250YHM-A
PQRY-P200YHM-A

PQRY-P550YSHM-A
PQRY-P300YHM-A
PQRY-P250YHM-A

Ø28.58

(*)

Ø22.2

Ø28.58
Ø19.05

Ø22.2

Ø19.05

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

(1) Pipe size

1 Field-supply the pipes to be connected to the kit.
2 If 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 heat source unit.

The distributor on the low-pressure side must be

placed in the heat source unit that has a larger
capacity index of the two, regardless of the relative
positions of the heat source units or their addresses.

If the distributor is placed in the heat source unit that

has a smaller capacity, refrigerant will not be properly
distributed and compressor failure may result.

( If heat source units that have the same capacity are

used in combination, the distributor can be placed in
either heat source unit.)

❈ Choose the correct size pipe using the above table. Connect the field- supplied pipe to the twinning kit for the sizes in the

table that are marked with an asterisk (*).

2

See reverse.