Mitsubishi Electric CITY MULTI CMY-R100CBK2 User manual

1
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
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
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.

3
(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
33
c1
1
3
5
1
3
5
4
8
9
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.
9
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

4
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
To
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)
Heat-resistant insulation material (field-supplied)
To be gap free
To be gap free
field-supplied pipe
field-supplied pipe
field-supplied pipe
hInsulation cover
2High-pressure
twinning pipe
Overlap margin of the tape