Mitsubishi Electric BDT CITY MULTI Installation and operation manual

CITY MULTI INSTALLATION AND
PRE-COMMISSIONING BOOKLET
The BDT & Mitsubishi Electric Partnership –
Delivering superior technology together
Since it’s founding in 1981, BDT has partnered with Mitsubishi
Electric to exclusively supply their products to the New Zealand
market. With over 30 years of partnership Mitsubishi Electric and
BDT hold a strong relationship which recognises the importance of
well trained, highly skilled technical support staff. Both companies
share the belief that quality support strengthens the product by
providing valuable design, installation, service and maintenance
information quickly and efficiently. BDT engineers and support staff
undergo regular factory training to confidently ensure that we are
supplying the most up to date and quality advice.
Confidential
This document has been designed, and can only be used as a guide
and as a singular reference tool for the Mitsubishi Electric City
Multi installation project that it was intended for.

This document is designed to outline BDT’s installation
and pre-commissioning expectations and in turn provide
a guide to ensure that an effective commissioning process
can be undertaken to minimise potential delays. It is
recommended that both the project manager and the onsite
supervisor/manager familiarise themselves with these
guidelines prior to calling BDT staff out to commence the
actual commissioning process on-site.
If BDT attends site to commission the new system and
find that the pre-commissioning expectations have not
been met as per the guidelines outlined in this document;
BDT reserves the right to leave site to attend to other
commitments and return once the pre-commissioning
expectations have been completed.
If the installer is unable to complete the pre-commissioning
process, BDT also reserves the right to submit charges to
cover our costs of returning to site and/or assisting with
bringing the system up to a commissionable standard.
These costs may include additional flights, accommodation,
travel time, parts and labour onsite. These charges are
additional to the actual commissioning cost charged at the
time of purchase of the product. Labour charges will be set
at $75.00 + GST per hour.
This booklet has been prepared on the basis of the latest
product and system specifications at the time of booklet
publication. It is intended as a guide and should not be
relied upon when designing system installations. From time
to time models, dimensions and specifications change so
differences may exist between the content of this manual
and final product specifications.
Always check the BDT website or contact Technical Services
on (0800 163 526) to confirm current product data before
carrying out any prescribed work.
The contents and instructions within this booklet do not
in any way negate local bylaws or New Zealand standards
and regulations, nor does it remove the requirement for
installers and/or service persons to be suitably qualified
to legitimately carry out the prescribed work. Please always
confirm and comply with your local regulations before
carrying out any prescribed installation or service work.
Statement of Confidentiality
All content included in this document is the property
of Black Diamond Technologies Limited and Mitsubishi
Electric Corporation Japan. Parts of this information are
protected by international copyright laws. This information
must remain confidential and may not be reproduced,
modified, republished, distributed, transmitted, displayed,
broadcast or otherwise exploited in any manner without
the express prior written permission of BDT. This document
has been designed, and can only be used as a guide and
as a singular reference tool for the Mitsubishi Electric City
Multi installation project that it was intended for.
As this publication is intended as a guide and is
considered reference material, in no event will Black
Diamond Technologies Limited be held liable for any
damages including, without limitation, direct, indirect,
special, incidental, consequential or punitive damages or
expenses arising for the misinterpretation/misapplication
of the recommended practices outlined herein.

CONTENTS
SECTION A
Installation Requirements and Procedures
Practice Piping Procedure
Twinning Kit Piping
Piping Limitations
Outdoor Unit Spacing
Mounting of Outdoor Units
Wiring Procedure
Power Supply Indoor and Outdoor Units
Inputs and Outputs
M-Net Wiring Procedure
M-Net Addressing
Piping and Wiring Schematics
Additional Refrigerant Calculations
Dip Switches
Auto Changeover
Indoor Unit Installation Setting Template
SECTION B
Installation and Commissioning Focus
(Back page in sleeve)
Pre-commissioning Site Inspection Form
Pre-commissioning Check Sheet
Indoor Unit Installation Setting
Project Piping and Wiring Schematics
04
07
14
24
27
31
32
40
43
46
49
51
56
66
67

4
01. PIPE RUN PLANNING
Planning of pipe runs should take into account the following criteria:
NOTE: Non-compliant pipe work will void the warranty.
02. NITROGEN PURGING
All brazing to be done with OFN (oxygen-free nitrogen) purging through the pipe work system.
Nitrogen should be circulated into the pipe work branches and are to be welded using a flow regulator. This prevents oxidation
of the inside of the pipe surface. This oxidation can block filters and LEV valve orifices, and cause oil contamination and
compressor failure.
ALL BRAZING MUST BE CARRIED OUT USING DRY NITROGEN PURGING.
NOTE: Failure to follow this guideline will void the warranty.
PRACTICE PIPING PROCEDURE [R410A]
Nominal Diameter Outside Diameter
(mm)
R22/R407C
mm across flare face
R410A
mm across flare face
1/4”
3/8”
1/2”
5/8”
3/4”
6.35
9.52
12.7
15.88
19.05
9
13
16.2
19.4
23.3
9.1
13.2
16.6
19.7
----
PIPE:
All pipe used in R410A installations is to comply with
AS/NZ Standard 1677 Part 2. Copper tube of the correct
wall thickness must be used.
SEALED PIPE:
Hard and soft drawn copper tube stored on site prior to
installation must have plastic end caps fitted to prevent
ingress of moisture and foreign objects. Bends and fittings
should be kept dry and in the original packing prior to
installation.
PENETRATIONS:
All building penetrations should be made in such a way that
the bare copper pipe does not contact the building fabric.
BENDS:
Minimise the number of bends. Ensure all soft drawn bends
are made with the correct size benders and are of full internal
diameter.
PIPE CLAMPS:
Ensure that the pipe work is fixed so there is no tension on
the indoor or outdoor unit connections. This can lead to stress
fractures at the flare/flange.
PIPE RUN LENGTHS:
Ensure the maximum pipe run lengths comply with system
specifications.
03. FLARE / FLANGE JOINTING PROCEDURE
R410A operates at much higher pressures than R22 and R407C refrigerants.
For this reason copper flare connection dimensions must meet the following criteria:

5
R410A flare nuts must also be used. Failure to do so can cause joint failure and refrigerant loss.
Prior to connecting flange and flare connections oil should be applied to the mating faces. Failure to do this causes tearing of
the copper flare surface. This causes leaking joints and joint failure due to material stress. The use of oil on connections also
allows the correct torque to be applied to the flare nut without pipe damage occurring.
Alkyl benzene oil is to be used to lubricate the connections. Alkyl benzene oil is hygroscopic (absorbs moisture) and should be
kept in an air tight container. The use of mineral based oil is not permitted as it contaminates the oil system and causes sludge
to form.
04. DAILY SECTIONAL SYSTEM PRESSURING
During installation of multiple circuit systems, it is recommended that at the end of each day, the pipe work be left pressurised
and any pressure loss be investigated prior to commencement of further piping the next day.
This procedure performs two functions:
1. Isolates any leaks to a small section of piping making it easier to trace and repair.
2. Pressurised pipe work prevents moisture and other foreign objects from entering the pipe work.
It is easier to pressurise the indoor units from the BC connection boxes.
NOTE: Please ensure that both vapour and liquid connections are pressurised (looped) otherwise damage to indoor LEVs can occur.
Risers can be capped prior to the BC boxes and pressurised from the outdoor unit service valve connections.
Pressure for overnight testing to 100 psi using dry nitrogen.
A final system pressure test of 500 psi using dry nitrogen held for 24 hours is required to prove complete system tightness prior
to evacuation. The results must be noted.
05. EFFECTIVE EVACUATION TECHNIQUES
• Effective evacuation technique at time of installation is a primary contributor to the long and trouble-free operation of
a refrigerant system. The downstream effects of moisture in a system can vary and include valve blockages, high head
pressures, oil sludging to copper plating of compressor internal parts and eventual compressor failures.
• Triple Evacuation Method must be used when evacuating the system prior to commissioning. The vacuum values reached at
each stage of evacuation must be noted on the pre-commissioning sheet contained in this booklet.
• Both the initial and second evacuation must be carried out with the schraedar valve cores removed. This allows the vacuum
pump to work more effectively at removing any moisture, and allows the dry nitrogen purges to be released quicker. Core
removal tools and vacuum charge valves are available, and allow the cores to be removed on the final evacuation.
• A check valve must be fitted to the vacuum pump to prevent the vacuum pump oil being sucked into the City Multi system if
the power is removed from the vacuum pump.
NOTE: Most vacuum pump oil is mineral-based and this is incompatible with the synthetic-based oil in the City Multi system.

6
• A two-stage vacuum pump with fresh vacuum pump oil capable of a vacuum of 50 microns should be selected. Where
possible it is best engineering practice to have a pump specifically for installations rather than the service pumps which tend
to deteriorate during service tasks.
• Using a 3/8” connection line to the manifold is important to allow quicker vapour volume removal.
• An accurate vacuum gauge is an essential tool to gauge the system tightness and the effectiveness of the evacuation
procedure. A vacuum of 1000 microns should be reached on the initial vacuum test. A rapid rise indicates a leak is present.
A small, slow rise indicates the possible presence of moisture. The slow rise is due to the moisture molecules slowly
detaching from the pipe surface and starting to expand in the vacuum void. This is why the vacuum must be held for a time.
Installation time and commissioning schedules often affect the time available for the ideal vacuum procedure.
It cannot be reinforced enough that an effective vacuum process is critical to the system’s long term operation and
warranty compliance.
• When possible it is preferable to use copper lines for evacuation purposes, as gauge hoses are porous when trying to
measure accurate deep vacuum.
VACUUM MEASUREMENT COMPARISONS
1 TORR = 1mm HG
1 TORR 1000 = 1000 microns
microns 1000 = 29.88” HG (inches or mercury)
microns = 1mm HG
1. Connect the vacuum pump, check valve, vacuum gauge, charge line with the access cores removed and pull an initial
vacuum of 1000 microns. Hold vacuum for 1 to 2 hours and monitor.
2. Break vacuum with dry nitrogen to 1 to 2 bars and release nitrogen.
3. Evacuate to 500 microns or less. Hold and monitor for 1 to 2 hours.
4. Break vacuum with dry nitrogen to 1 to 2 bars and release nitrogen.
5. Refit access valve cores. Evacuate down to best vacuum as close to 200 microns as possible. Hold for 8 hours.
6. Add additional refrigerant while system is under vacuum (as calculated from pipe lengths). Open outdoor unit isolation
valves. System should now be ready for commissioning.
06. RECOMMENDED TRIPLE EVACUATION PROCEDURE
NOTE: BDT reserves the right to cut sections of pipe open and inspect if there
is any doubt dry nitrogen has not been purged through the pipe work during the
welding of any copper connections.

7
Correct piping of the twinning kit is essential to the performance and safety of the equipment
installed. It is critical that the instructions below are followed closely as incorrect piping can lead to
performance loss and/or catastrophic failure of the compressor.
Outdoor unit 2Outdoor unit 1
High-pressure
twinning pipe
200mm [7-7/8 in.]
max.
To BC controller
Twinning pipe (low-pressure side)
Twinning pipe (high-pressure side)
On-site piping (low-pressure connecting pipe: between outdoor units)
On-site piping (low-pressure main pipe: to BC controller)
On-site piping (high-pressure main pipe: to BC controller)
Straight run of pipe that is 500 mm [19-11/16 in.] or more
See the Installation Manual for the details of Twinning pipe installation.
See the following drawing for connecting the pipes between the outdoor units.
Twinning on the outdoor unit side
R2 SERIES TWINNING KIT PIPING

8
R2 SERIES TWINNING KIT PIPING (CONTINUED)
Refrigerant pipe routing
Installation
· P200, 250, EP200, 250
· EP400, 450
(5-29/32) (3-23/32)
150 × 94 Knockout hole
Specifications
For pipes
Bottom through hole
Usage
NO .
For wires
(2-1/16)
(2-9/16)
Ø52 Knockout hole
Ø65 Knockout hole
Bottom through hole
Bottom through hole
A
C
B
(Unit: mm [in.])
Installation base perpendicular to the unit’s front panelInstallation base parallel to the unit’s front panel
· P300, 350, EP300, 350
When the pipes and/or cables are routed at the bottom of the unit, make sure that the through hole at the base of
the unit does not get blocked with the installation base.
When the pipes are routed at the bottom of the unit, the base should be at least 100 mm [3-15/16 in.] in height.
The figure above shows a unit on which a low-pressure twinning pipe kit is not installed.
The gaps around the edges of through holes for pipes and wires on the
unit allow water or mice to enter the unit and damage its parts. Close
these gaps with filler plates.
This unit allows two types of pipe routing:
• Bottom piping
• Front piping
To prevent small animals, water and snow from
entering the unit and damaging its parts, close
the gap around the edges of through holes for
pipes and wires with filler plates.
CAUTION
Fill the gap at the site
Example of closure materials
(field supply)
681(678~684)
29.5
(740)
29.5
8076080
177
222 051
121
196
94 84
B
A
C
(Mounting pitch)
2×2-14×31 Oval hole
2×2-14×20 Oval hole
Bottom view
(Mounting pitch)
(without detachable leg)
B
CA
(Mounting pitch)
(Mounting pitch)
Bottom view
2×2-14×31 Oval hole
2×2-14×20 Oval hole
681(678~684) 5.925.92
80106080
121
196
(740)
227
272 150
84
94
(without detachable leg)
516
561 150
84
121
196
80 795 795 80
29.529.5
(740)
94
BA C
(Mounting pitch) (Mounting pitch)
Bottom view
681(678~684)
(Mounting pitch)
2×3-14×31 Oval hole
2×3-14×20 Oval hole
(without detachable leg)

9
4 - 115
4. Outdoor Installation AN1 2nd
S.D. R2
MEE14K009
4-3-6. Twinning on the outdoor unit side
• The pipe from multiple outdoor units must be installed so that oil will not accumulate in the pipe under certain
conditions. Refer to the figures below for details.
* Small dots in the figures indicate branching points.
In an R2 system: To a BC controller
(1) The pipe from the outdoor units must be inclined downward to the indoor unit side. In the figure on the right,
because the pipe is inclined upward, the oil in the pipe accumulates when Unit 1 is in operation and Unit 2 is
stopped.
(2) The distance between the unit bottom and the pipe (H) must be 0.2 m (7-7/8 in) or below. In the figure on the
right, because the distance is more than 0.2 m (7-7/8 in), the oil accumulates in Unit 1 when Unit 2 is in
operation and Unit 1 is stopped.
H
H
(3) The vertical separation between units (H) must be 0.1 m (3-15/16 in) or below. In the figure on the right,
because the distance is more than 0.1 m (3-15/16 in), the oil accumulates in Unit 1 when Unit 2 is in operation
and Unit 1 is stopped.
H
H
(4) The vertical separation between units (H) must be 0.1 m (3-15/16 in) or below. In the figure on the right,
because the distance is more than 0.1 m (3-15/16 in), the oil accumulates in Unit 2 when Unit 1 is in operation
and Unit 2 is stopped.
H
H
• Make sure that the inclination tolerance of the Twinning Kit is ±15˚ to the ground to avoid unit damage.
±15°
Twinning Kit
• Do not install traps to prevent oil backflow and compressor start-up failure.
Unit 2
Unit 1 Unit 2Unit 1
Unit 2
Unit 2
Unit 1
Unit 1
H ≤ 0.2 m (7-7/8 in)
Unit 2Unit 1
H > 0.2 m (7-7/8 in)
Unit 1
Unit 2
Unit 1
H ≤ 0.1 m (3-15/16 in)
Unit 2
Unit 1
H > 0.1 m (3-15/16 in)
Unit 1
Unit 2
Unit 1
H ≤ 0.1 m (3-15/16 in)
Unit 2
Unit 1
H > 0.1 m (3-15/16 in)
A
A
A
A
A
A
A
A
A
A
A
A
0000003417.BOOK 115 ページ ２０１４年１０月２２日 水曜日 午前１０時３５分

10
Correct piping of the twinning kit is essential to the performance and safety of the equipment
installed. It is critical that the instructions below are followed closely as incorrect piping can lead to
performance loss and/or catastrophic failure of the compressor.
The length of the straight pipe must be 500mm[19-11/16 in.] or longer.
If not, it may cause improper operation.
CAUTION
Field piping
Twinning kit
Twinning kit
Field piping
Field piping
Field piping
Twinning kit
The length of the straight pipe
must be 500 mm [19-11/16 in.] or longer
The length of the straight pipe
must be 500 mm [19-11/16 in.] or longer
The length of the straight pipe
must be 500 mm [19-11/16 in.] or longer
See the following drawing for connecting the pipes between the outdoor units.
<In case of 2 unit combination>
<In case of 3 unit combination>
Twinning on the outdoor unit side
Field piping
Y SERIES TWINNING KIT PIPING

11
4 - 55
S.D. Y
MEE14K009
4. Outdoor Installation AN1 2nd
To indoor unit
Twinning pipe 1
200mm [7-7/8 in.]
or less
200mm [7-7/8 in.]
or less
Outdoor unit1 Outdoor unit 2
Outdoor unit 1 Outdoor unit 2 Outdoor unit 3
Twinning pipe 1 Twinning pipe 2
To Indoor unit
<PUHY-P400YSKB-A>
<PUHY-EP500YSLM-A>
<PUHY-P950YSKB-A>
<PUHY-EP800YSLM-A>
0000003416.BOOK 55 ページ ２０１４年１１月１１日 火曜日 午前９時３４分

12
Y SERIES TWINNING KIT PIPING (CONTINUED)
Refrigerant pipe routing
Installation
·P200, 250
EP200, 250
·P450
EP400, 450
· P300, 350, 400
EP300, 350
Installation base perpendicular to the unit’s front panelInstallation base parallel to the unit’s front panel
When the pipes and/or cables are routed at the bottom of the unit, make sure that the through hole at the base of
the unit does not get blocked with the installation base.
When the pipes are routed at the bottom of the unit, the base should be at least 100 mm [3-15/16 in.] in height.
(Unit : mm [in.])
Bottom view
Bottom view
Bottom view
(5-29/32) (3-23/32)
150 × 94 Knockout hole
Specifications
For pipes Bottom through hole
Usage
NO .
For wires
(2-1/16)
(2-9/16)
Ø52 Knockout hole
Ø65 Knockout hole
Bottom through hole
Bottom through hole
The gaps around the edges of through holes for pipes and wires on the
unit allow water or mice to enter the unit and damage its parts. Close
these gaps with filler plates.
This unit allows two types of pipe routing:
• Bottom piping
• Front piping
To prevent small animals, water and snow from
entering the unit and damaging its parts, close
the gap around the edges of through holes for
pipes and wires with filler plates.
CAUTION
Fill the gap at the site
Example of closure materials
(field supply)
A
C
B
B
A
C
2×2-14×31 Oval hole
2×2-14×20 Oval hole
(without detachable leg)
(Mounting pitch)
681(678~684)
29.5
(740)
29.5
80
(Mounting pitch)
76080
177
222 051
121
196
94 84
B
CA
(Mounting pitch)
(Mounting pitch)
2×2-14×31 Oval hole
2×2-14×20 Oval hole
(without detachable leg)
681(678~684) 5.925.92
80106080
121
196
(740)
227
272 150
8494
516
561 150
84
121
196
80 795 795 80
29.5
681(678~684)
29.5
(740)
94
BA
C
(Mounting pitch) (Mounting pitch)
(Mounting pitch)
2×3-14×31 Oval hole
2×3-14×20 Oval hole(without detachable leg)

13
Twinning on the outdoor unit side
Twinning pipe
±15°
The tilt angle of the twinning pipe should
be within ±15°with the horizontal plane.
Note: See the following drawing for the fitting
position of the twinning pipe.
The tilt angle of the twinning pipe
The tilt angle of the twinning pipe must be within ±15° with the horizontal plane.
Tilting the twinning pipe more than specified will cause damage to the unit.
The length of the straight part of the pipe before the branching
For the twinning kit, always use the accessory piping parts.
The length of the straight part of pipe connected in front of the
twinning pipe must be 500 mm [19-11/16 in.] or longer.
(Connect the field piping so that the length of the straight part
of pipe connected in front of the twinning pipe can be 500 mm
[19-11/16 in.] or longer.)
If the length is less than 500 mm [19-11/16 in.], it will cause damage
to the unit.
To Indoor unit
Less than 2 m [6 ft.]
To Indoor unit
2m [6 ft.]
200 mm [7-7/8 in.]
or over
Trap
(gas pipe only)
Precautions for outdoor unit combinations
<2 m [6 ft.] or less> <More than 2 m [6 ft.]>
Caution:
Do not install traps other than the ones between outdoor units described on a separate sheet to prevent oil backflow and compressor start-up failure.
Do not install solenoid valves to prevent oil backflow and compressor start-up failure.
Do not install a sight glass because it may show improper refrigerant flow.
If a sight glass is installed, inexperienced technicians that use the glass may overcharge the refrigerant.
•
•
•
<A> Install the piping so that oil will not accumulate in the stopped outdoor unit.
1.
unit 1 unit 2 unit 3 unit 1 unit 2 unit 3
unit 1 unit 2 unit 3
The NG example shows that oil accumulates because the units are installed on a reverse gradient while unit 1 is in operation, and unit 3 is stopped.
2.
unit 1 unit 2 unit 3
unit 1 unit 2 unit 3
h1
h1 = 0.2 m (7-7/8 in) max
h1
h1 > 0.2 m (7-7/8 in)
The NG example shows that oil accumulates into units 1 and 2 while unit 3 is in operation, and units 1 and 2 are stopped.
Vertical pipe height (h) should be 0.2 m (7-7/8 in) or below.
3.
unit 1
unit 2 unit 3
unit 3
h2 h2 = 0.1 m (3-15/16 in) max
unit 1
unit 2 unit 3
h2
h2 > 0.1 m (3-15/16 in)
The NG example shows that oil accumulates into unit 1 while unit 3 is in operation, and unit 1 is stopped. Vertical pipe height (h) should be 0.2 m (7-7/8 in) or below.
4.
unit 1 unit 2
h2 = 0.1 m (3-15/16 in) max
h2
h2 > 0.1 m (3-15/16 in)
The NG example shows that oil accumulates into unit 3 while unit 1 is in operation, and unit 3 is stopped. Vertical pipe height (h) should be 0.2 m (7-7/8 in) or below.
<B> When the piping on the outdoor unit side (from the twinning pipe) exceeds 2 m [6 ft], ensure a trap (gas pipe only) within 2 m [6 ft].
Make sure the height of the trap is 200 mm [7-7/8 in] or more.
If there is no trap, oil can accumulate inside the pipe, causing a shortage of oil and possible damage to the compressor.
To Indoor unit
To Indoor unit
Twinning pipe Twinning pipe Twinning pipe Twinning pipe
Downward slope Upward slope
unit 3
unit 1 unit 2
h2

14
R2 SERIES PIPING LIMITATIONS
3-2. Piping Design
3-2-1. If 16 ports or less are in use, I.e., if only one BC controller is in use with no sub BC controller
PURY-P-YLM
Table 3-2-1-1 . Piping length limitation Table3-2-1-2. Bent equivalent length "M"
Item Piping in the figure Max. length Max. equivalent length Outdoor Model M (m/bent [ft./bent])
Total piping length A+B+a+b+c+d *1 - P200YLM 0.35 [1.15']
Farthest IU from OU A+B+d 165 [541'] 190 [623'] P250YLM 0.42 [1.38']
Distance between OU and BC A 110 [360'] *1 110 [360'] *1 P300YLM
P350YLM
0.42 [1.38']
Farthest IU from BC controller B+d 40 [131'] *2*3 40 [131'] *3 0.47 [1.54']
Heignt between OU and IU (OU above IU) H 50 [164'] *5 -
Heignt between OU and IU (OU under IU) H' 40 [131'] *6 -
Height between IU and BC h1 15 [49'] (10 [32']) *4 -
Height between IU and IU h2 15 [49'] (10 [32']) *4 -
Fig. 3-2-1-1 Piping length and height between IU and BC controller
Table3-2-1-3. Piping "A"size selection rule (mm [in.])
(m [ft.])
Outdoor Model Pipe(High pressure) Pipe(Low pressure)
P200YLM ø15.88 [5/8"] ø19.05 [3/4"]
P250YLM ø19.05 [3/4"] ø22.20 [7/8"]
P300YLM
P350YLM
ø19.05 [3/4"] ø22.20 [7/8"]
ø19.05 [3/4"] ø28.58 [1-1/8"]
Table3-2-1-4. Piping "B" size seleciton rule (mm [in.])
Total down-stream Indoor capacity Pipe(Liquid) Pipe(Gas)
P140 or less ø9.52 [3/8"] ø15.88 [5/8"]
Table3-2-1-5. Piping "a", "b", "c", "d" size selection rule (mm [in.])
Indoor Unit size Pipe(Liquid) Pipe(Gas)
P15 to P50, GUF-50RD(H) ø6.35 [1/4"] ø12.70 [1/2"]
P63 to P140, GUF-100RD(H) ø9.52 [3/8"] ø15.88 [5/8"]
]"4/3[50.91ø]"8/3[25.9ø002P
]"8/7[02.22ø]"8/3[25.9ø052P
Note1. No Header usable on PURY system.
Note2. Indoor unit sized P100-P250 should be connected to BC controller via Y shape joint CMY-R160-J1 ;
Note3. Indoor unit sized P100-P250 does NOT share BC controller ports with other Indoor units ;
Note4. As bends cause pressure loss on transportation of refrigerant, fewer bends design is better ;
Piping length needs to consider the actual length and equivalent length which bends are counted.
Equivalent piping length (m)=Actual piping length+"M" x Number of bends.
Note5. Set DIP-SW 4-6 to ON of BC controller, in case of connected Indoor unit sized P100-P140 with 2 ports.
Note6. It is also possible to connect Indoor unit sized P100-P140 with 1 port (set DIP-SW 4-6 to OFF).
Note7. Individual indoor units grouped together to connect to the BC controller via one port cannot operate
individually in heating and cooling modes at the same time. I.e., they must all function in either heating
However, the cooling capacity decreases a little (For details, refer to the chapter OUTDOOR UNITS,
R2 SERIES, 6-4. Correction by port counts of the BC controller).
or cooling together.
Note8. Indoor capactiy is described as its model size. For example, PEFY-P63VMA-E, its capacity is P63.
Note9. Total down-stream Indoor capacity is the summary of the model size of Indoors down-stream.
Note10. To enable the continuous heating mode, set SW4 (848) to ON.
For example, PEFY-P63VMA-E + PEFY-P32VMA-E : Total Indoor capacity = P63 + P32 = P95.
OU : Outdoor Unit ; IU : Indoor Unit ; BC : BC controller
*1. Refer to the section 3-2-7.
*2. Details refer to Fig.3-2-1-1
*3. Farthest Indoor from BC controller "B+d" can exceed 40m till 60m if no Indoor sized P200, P250 connected. Details refer to Fig.3-2-1-1
*4. Distance of Indoor sized P200, P250 from BC must be less than 10m, if any.
*5. 90m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
*6. 60m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
0
10
20
30
40
50
60
70
0 5 10 15
Height difference between the main BC controller
and indoor unit (m)
Pipe length between the main BC
controller and indoor unit (m)
(P100-250)
BC controller
ab
HH'
h1
IU
(P15-P80)
Joint
(CMY-R160-J1)
IU
Joint
(CMY-Y102SS-G2)
Max.3 sets for 1 port.
Total capacity <= P80
B
c
d
IU
A
OU
Reducer (P15~P50)
(attached with BC controller)
IU
h2
For outodoor units equal to or larger than a size P400, on
the BC controller please ensure CMB-P•V-GA1 is used.
ST
M
N
CMY-R160-J1
(
Gas side) IU
CMY-R160-J1
(
Liquid side)
BC controller
Fig. 3-2-1AA
Fig. 3-2-1A Piping scheme
(T)ø19.05ID
(N)ø9.52ID
(M)ø3/8"(Brazing)
(M)ø3/8"(Brazing)
(S)ø5/8"(Brazing)
(S)ø5/8"(Brazing)
226
226
Joint CMY-R160-J1 Gas side
Joint CMY-R160-J1 Liquid side

15
3. Piping DesignAN1 2nd
3-2-2. If 16 ports or less are in use, I.e., if only one BC controller is in use with no sub BC controller
PURY-EP-YLM
Table 3-2-1-1 . Piping length limitation Table3-2-1-2. Bent equivalent length "M"
Item Piping in the figure Max. length Max. equivalent length Outdoor Model M (m/bent [ft./bent])
Total piping length A+B+a+b+c+d *1 - EP200YLM 0.35 [1.15']
Farthest IU from OU A+B+d 165 [541'] 190 [623'] EP250YLM 0.42 [1.38']
Distance between OU and BC A 110 [360'] *1 110 [360'] *1 EP300YLM
EP350YLM
0.42 [1.38']
Farthest IU from BC controller B+d 40 [131'] *2*3 40 [131'] *3
EP400YLM
0.47 [1.54']
Heignt between OU and IU (OU above IU) H 50 [164'] *5 -
EP450YLM 0.50 [1.64']
0.50 [1.64']
Heignt between OU and IU (OU under IU) H' 40 [131'] *6 -
Height between IU and BC h1 15 [49'] (10 [32']) *4 -
Height between IU and IU h2 15 [49'] (10 [32']) *4 -
Fig. 3-2-1-1 Piping length and height between IU and BC controller
Table3-2-1-3. Piping "A"size selection rule (mm [in.])
(m [ft.])
Outdoor Model Pipe(High pressure) Pipe(Low pressure)
EP200YLM ø15.88 [5/8"] ø19.05 [3/4"]
EP250YLM ø19.05 [3/4"] ø22.20 [7/8"]
EP300YLM
EP350YLM
ø19.05 [3/4"] ø22.20 [7/8"]
EP400YLM
ø19.05 [3/4"] ø28.58 [1-1/8"]
EP450YLM ø22.20 [7/8"] ø28.58 [1-1/8"]
ø22.20 [7/8"] ø28.58 [1-1/8"]
Table3-2-1-4. Piping "B" size seleciton rule (mm [in.])
Total down-stream Indoor capacity Pipe(Liquid) Pipe(Gas)
P140 or less ø9.52 [3/8"] ø15.88 [5/8"]
Table3-2-1-5. Piping "a", "b", "c", "d" size selection rule (mm [in.])
Indoor Unit size Pipe(Liquid) Pipe(Gas)
P15 to P50, GUF-50RD(H) ø6.35 [1/4"] ø12.70 [1/2"]
P63 to P140, GUF-100RD(H) ø9.52 [3/8"] ø15.88 [5/8"]
]"4/3[50.91ø]"8/3[25.9ø002P
]"8/7[02.22ø]"8/3[25.9ø052P
Note1. No Header usable on PURY system.
Note2. Indoor unit sized P100-P250 should be connected to BC controller via Y shape joint CMY-R160-J1 ;
Note3. Indoor unit sized P100-P250 does NOT share BC controller ports with other Indoor units ;
Note4. As bends cause pressure loss on transportation of refrigerant, fewer bends design is better ;
Piping length needs to consider the actual length and equivalent length which bends are counted.
Equivalent piping length (m)=Actual piping length+"M" x Number of bends.
Note5. Set DIP-SW 4-6 to ON of BC controller, in case of connected Indoor unit sized P100-P140 with 2 ports.
Note6. It is also possible to connect Indoor unit sized P100-P140 with 1 port (set DIP-SW 4-6 to OFF).
Note7. Individual indoor units grouped together to connect to the BC controller via one port cannot operate
individually in heating and cooling modes at the same time. I.e., they must all function in either heating
However, the cooling capacity decreases a little (For details, refer to the chapter OUTDOOR UNITS,
R2 SERIES, 6-4. Correction by port counts of the BC controller).
or cooling together.
Note8. Indoor capactiy is described as its model size. For example, PEFY-P63VMA-E, its capacity is P63.
Note9. Total down-stream Indoor capacity is the summary of the model size of Indoors down-stream.
For example, PEFY-P63VMA-E + PEFY-P32VMA-E : Total Indoor capacity = P63 + P32 = P95.
OU : Outdoor Unit ; IU : Indoor Unit ; BC : BC controller
*1. Refer to the section 3-2-7.
*2. Details refer to Fig.3-2-1-1
*3. Farthest Indoor from BC controller "B+d" can exceed 40m till 60m if no Indoor sized P200, P250 connected. Details refer to Fig.3-2-1-1
*4. Distance of Indoor sized P200, P250 from BC must be less than 10m, if any.
*5. 90m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
*6. 60m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
0
10
20
30
40
50
60
70
0 5 10 15
Height difference between the main BC controller
and indoor unit (m)
Pipe length between the main BC
controller and indoor unit (m)
(P100-250)
BC controller
ab
HH'
h1
IU
(P15-P80)
Joint
(CMY-R160-J1)
IU
Joint
(CMY-Y102SS-G2)
Max.3 sets for 1 port.
Total capacity <= P80
B
c
d
IU
A
OU
Reducer (P15~P50)
(attached with BC controller)
IU
h2
For outodoor units equal to or larger than a size P400, on
the BC controller please ensure CMB-P•V-GA1 is used.
ST
M
N
CMY-R160-J1
(
Gas side) IU
CMY-R160-J1
(
Liquid side)
BC controller
Fig. 3-2-1AA
Fig. 3-2-1A Piping scheme
Note10. To enable the continuous heating mode, set SW4 (848) to ON.
(T)ø19.05ID
(N)ø9.52ID
(M)ø3/8"(Brazing)
(M)ø3/8"(Brazing)
(S)ø5/8"(Brazing)
(S)ø5/8"(Brazing)
226
226
Joint CMY-R160-J1 Gas side
Joint CMY-R160-J1 Liquid side

16
R2 SERIES PIPING LIMITATIONS (Continued)
3-2-3. If more than 16 ports are in use, or if there is more than one BC controller in use for one outdoor unit
Table 3-2-2-1 . Piping length limitation (m [ft.]) Table3-2-2-2. Bent equivalent length "M"
Item Piping in the figure Max. length Max. equivalent length Outdoor Model M (m/bent [ft./bent])
Total piping length A+B+C+D+E+a+b+c+d+e+f *1 - P200YLM 0.35 [1.15']
Farthest IU from OU A+C+E+f 165 [541'] 190 [623'] P250YLM 0.42 [1.38']
Distance between OU and BC A 110 [360'] *1 110 [360'] *1 P300YLM
P350YLM
0.42 [1.38']
Farthest IU from BC controller B+d or C+D+e or C+E+f 40 [131'] *2*3 40 [131'] *2*3 0.47 [1.54']
Heignt between OU and IU (OU above IU) H 50 [164'] *6 -
Heignt between OU and IU (OU under IU) H' 40 [131'] *7 -
Height between IU and BC h1 15 [49'] (10 [32']) *4 -
Height between IU and IU h2 15 [49'] (10 [32']) *4 -
Heignt between BC(Main or Sub) and BC(Sub) h3 15 [49'] (10 [32']) *5 -
Fig. 3-2-2-1 Piping length and height between IU and BC controller
Table3-2-2-3. Piping "A"size selection rule (mm [in.])
Outdoor Model Pipe(High pressure) Pipe(Low pressure)
P200YLM ø15.88 [5/8"] ø19.05 [3/4"]
P250YLM ø19.05 [3/4"] ø22.20 [7/8"]
P300YLM
P350YLM
ø19.05 [3/4"] ø22.20 [7/8"]
ø19.05 [3/4"] ø28.58 [1-1/8"]
Table3-2-2-4. Piping "B" size seleciton rule (mm [in.])
Total down-stream Indoor capacity Pipe(Liquid) Pipe(Gas)
]"8/5[88.51ø]"8/3[25.9øsselro041P
Table3-2-2-5. Piping "C", "D", "E" size selection rule (mm [in.])
Total down-stream Indoor capacity Pipe(Lequid) Pipe(HP Gas) Pipe(LP Gas)
P200 or less ø9.52 [3/8"] ø15.88 [5/8"] ø19.05 [3/4"]
P201 to P300 ø9.52 [3/8"] ø19.05 [3/4"] ø22.20 [7/8"]
P301 to P350 ø12.70 [1/2"] ø19.05 [3/4"] ø28.58 [1-1/8"]
P351 to P400 ø12.70 [1/2"] ø22.20 [7/8"] ø28.58 [1-1/8"]
P401 to P450 ø15.88 [5/8"] ø22.20 [7/8"] ø28.58 [1-1/8"]
HP : High pressure, LP:Low pressure
Table3-2-2-6. Piping "a", "b", "c", "d", "e", "f" saize selection rule (mm [in.])
Indoor Unit size Pipe(Lequid) Pipe(Gas)
P15 to P50, GUF-50RD(H) ø6.35 [1/4"] ø12.70 [1/2"]
P63 to P140, GUF-100RD(H) ø9.52 [3/8"] ø15.88 [5/8"]
P200 ø9.52 [3/8"] ø19.05 [3/4"]
P250 ø9.52 [3/8"] ø22.20 [7/8"]
OU : Outdoor Unit ; IU : Indoor Unit ; BC : BC controller
*1. Refer to the section 3-2-7.
*2. Details refer to Fig.3-2-2-1
*3. Farthest Indoor from BC controller "B+d or C+D+e or C+E+f " can exceed 40m till 60m if no Indoor sized P200, P250 connected.
Details refer to Fig.3-2-2-1
*4. Distance of Indoor sized P200, P250 from BC must be less than 10m, if any.
*5. When using 2 Sub BC controllers, max. height "h3" should be considered.
*7. 60m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
*6. 90m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
0
10
20
30
40
50
60
70
0 5 10 15
Height difference between the main BC controller
and indoor unit (m)
Note1. No Header usable on PURY system.
Note2. Indoor unit sized P100-P250 should be connected to BC controller via Y shape joint CMY-R160-J1 ;
Note3. Indoor unit sized P100-P250 does NOT share BC controller ports with other Indoor units ;
Note4. As bends cause pressure loss on transportation of refrigerant, fewer bends design is better ;
Piping length needs to consider the actual length and equivalent length which bends are counted.
Equivalent piping length (m)=Actual piping length+"M" x Number of bends.
However, the cooling capacity decreases a little (For details, refer to the chapter OUTDOOR UNITS,
R2 SERIES, 6-4. Correction by port counts of the BC controller).
Note5. Set DIP-SW 4-6 to ON of BC controller, in case of connected Indoor unit sized P100-P140 with 2 ports.
Note6. It is also possible to connect Indoor unit sized P100-P140 with 1 port (set DIP-SW 4-6 to OFF).
Note7. Individual indoor units grouped together to connect to the BC controller via one port cannot operate individually
in heating and cooling modes at the same time. I.e., they must all function in either heating or cooling together.
Note8. For sub BC controller CMB-P•V-GB1 the connectable indoor unit capacities may sum to equal that of a
P350 unit or less. However, if two sub controllers are used the TOTAL sum of connectable units
connected to BOTH sub controllers must also not exceed that of a P350 unit.
For sub BC controller CMB-P1016V-HB1 the connectable indoor unit capacities may sum to equal that
or a P350 unit or less. However, if two sub controllers are used the TOTAL sum of connectable units
connected to BOTH sub controllers must also not exceed that of a P450 unit.
Note9. Indoor capactiy is described as its model size. For example, PEFY-P63VMA-E, its capacity is P63.
Note10. Total down-stream Indoor capacity is the summary of the model size of Indoors down-stream.
Note11. To enable the continuous heating mode, set SW4 (848) to ON.
For example, PEFY-P63VMA-E + PEFY-P32VMA-E : Total Indoor capacity = P63 + P32 = P95.
ST
M
N
CMY-R160-J1
(Gas side) IU
CMY-R160-J1
(Liquid side)
BC controller
Fig. 3-2-2AA
BC controller (Main BC)
IU
a
IU
C
b
HH'
h1 h1
IU
(P15-P80) (P100-P250)
CMY-R160-J1
(Joint)
IU
CMY-Y102SS-G
(Joint)
Max.3 sets for 1 port.
Total capacity < = P80
BC controller (Sub BC)
BC controller (Sub BC)
B
cd
IU
f
h3
D
E
CMY-Y202S-G2
CMY-Y102LS-G2
CMY-Y102SS-G2
(Joint)
A
IU
eh1
OU : Outdoor unit, IU : Indoor unit
OU
Reducer (P15-P50)
(attached with BC controller) h2
Fig. 3-2-2A Piping scheme
(T)ø19.05ID
(N)ø9.52ID
(M)ø3/8"(Brazing)
(M)ø3/8"(Brazing)
(S)ø5/8"(Brazing)
(S)ø5/8"(Brazing)
226
226
Joint CMY-R160-J1 Gas side
Joint CMY-R160-J1 Liquid side
Pipe length between the main BC
controller and indoor unit (m)
PURY-P-YLM

17
Maximum pipe run
4 - 103
3. Piping Design AN1 2nd
S.D. R2
MEE14K009
3-2-7. Total piping length restrictions
[PURY-P200, 250YLM-A] [PURY-P300, 350YLM-A]
[PURY-P700, 750, 800, 850, 900YSLM-A]
200
300
400
500
600
700
800
900
1000
10 20 30 40 50 60 70 80 90 100 110
Distance between outdoor unit and BC controller(m)
Tot al extended pipe length (m)
200
300
400
500
600
700
800
900
1000
10 20 30 40 50 60 70 80 90 100 110
Distance between outdoor unit and BC controller(m)
Tot al extended pipe length (m)
200
300
400
500
600
700
800
900
1000
10 20 30 40 50 60 70 80 90 100 110
Distance between outdoor unit and BC controller(m)
Tot al extended pipe length (m)
[PURY-P400, 450, 500, 550YSLM-A]
200
300
400
500
600
700
800
900
1000
10 20 30 40 50 60 70 80 90 100 110
Distance between outdoor unit and BC controller(m)
Tot al extended pipe length (m)
[PURY-P600, 650YSLM-A]
200
300
400
500
600
700
800
900
1000
10 20 30 40 50 60 70 80 90 100 110
Distance between outdoor unit and BC controller(m)
Tot al extended pipe length (m)
0000003417.BOOK 103 ページ ２０１４年１０月２２日 水曜日 午前１０時３５分

18
Y SERIES PIPING LIMITATIONS
3. Piping DesignAN1 2nd
3-2. Piping Design
Selection criteria for joints
Total down-stream Indoor capacity Joint
~ P200 CMY-Y102SS-G2
P201 ~ P400 CMY-Y102LS-G2
P401 ~ P650 CMY-Y202S-G2
P651 ~ CMY-Y302S-G2
*Concerning detailed usage of Joint parts, refer to its Installation Manual.
Header selection rule
4-branch Header 8-branch Header 10-branch Header
CMY-Y104-G CMY-Y108-G CMY-Y1010-G
Total down-stream Indoor capacity <=P200 <=P400 <=P650
* CMY-Y104-G can directly connect PUHY-P200YKB, but can NOT directly connect PUHY-P250YKB or above;
* CMY-Y108-G can directly connect PUHY-P200-450Y(S)KB, but can NOT directly connect PUHY-P500YSKB or
above;
* CMY-Y1010-G can directly connect PUHY-P200-600Y(S)KB;
* CMY-Y104-G can NOT connect P200,P250 Indoor, but CMY-Y108, Y1010-G can do;
* Concerning detailed usage of Header parts, refer to its Installation Manual.
Note3. Indoor capacity is described as its model size;
For example, PEFY-P32VMA-E, its capacity is P32;
Note4. Total down-stream Indoor capacity is the summary of the model size of Indoors downstream.
For example, PEFY-P25VMA-E+PEFY-P32VMA-E: Total Indoor capacity=P25+P32=P57
Note5. Piping sized determined by the Total down-stream indoor capacity is NOT necessary
to be bigger than the up-stream one.
i.e. A>=B; A>=C>=D
Note1. No Joint after Header; Piping direct to Indoor Unit from Header;
Note2. As bends cause pressure loss on transportation of refrigerant, fewer bends design is better;
Piping length needs to consider the actual length and equivalent length which bends are counted.
Equivalent piping length (m)=Actual piping length+"M" x Quantity of bends.
IU : Indoor unit , OU : Outdoor unitFig. 3-2-1A Piping scheme
L1
L2
C
b
h1
c
dg e
A
B
Da
Joint
H (OU above IU) H' (OU under IU)
IU IU
f
E
IU IU
IU IU IU
Header
1st Joint
Capped
*1
*3
*2
*4
OU
3-2-1. PUHY-P200-350YKB-A Piping
Piping length (m [ft.])
htgnel.xaMerugifehtnignipiPmetI
Max. equivalent length
Total piping length A+B+C+D+E+a+b+c+d+e+f+g 1000 [3280'] -
Farthest IU from OU (L1) A+C+D+E+g / A+B+c 165 [541'] 190 [623']
Farthest IU from first Joint (L2) C+D+E+g / B+c 40 [131'] 40 [131']
Height between OU and IU (OU above IU) 05H [164'] -
Height between OU and IU (OU under IU) H' 40 [131'] -
Height between IU and IU h1 15 [49'] -
OU: Outdoor Unit, IU: Indoor Unit
Piping "A" size selection rule (mm [in.])
Outdoor unit )diuqiL(epiP Pipe(Gas)
PUHY-P200YKB ø9.52 [3/8"] ø22.20 [7/8"]
PUHY-P250YKB ø9.52 [3/8"] *1 ø22.20 [7/8"]
PUHY-P300YKB ø9.52 [3/8"] *2 ø22.20 [7/8"]
PUHY-P350YKB ø12.70 [1/2"] ø28.58 [1-1/8"]
*1. L1>=90m [295ft.], ø12.70mm [1/2in.] ; L1<90m [295ft.], ø9.52mm [3/8in.]
*2. L1>=40m [131ft.], ø12.70mm [1/2in.] ; L1<40m [131ft.], ø9.52mm [3/8in.]
Piping"B","C","D","E"size selection rule (mm [in.])
Total down-stream Indoor capacity Pipe(Liquid) Pipe(Gas)
~ P140 ø9.52 [3/8"] ø15.88 [5/8"]
P141 ~ P200 ø9.52 [3/8"] ø19.05 [3/4"]
P201 ~ P300 ø9.52 [3/8"] ø22.20 [7/8"]
P301 ~ P400 ø12.70 [1/2"] ø28.58 [1-1/8"]
P401 ~ P650 ø15.88 [5/8"] ø28.58 [1-1/8"]
P651 ~ P800 ø19.05 [3/4"] ø34.93 [1-3/8"]
P801 ~ ø19.05 [3/4"] ø41.28 [1-5/8"]
Piping "a","b","c","d","e","f","g" size selection rule (mm [in.])
Indoor Unit size Pipe(Liquid) Pipe(Gas)
P20,P25,P32,P40,P50,GUF-50RD(H) ø6.35 [1/4"] ø12.70 [1/2"]
P63,P71,P80,P100,P125,P140,GUF-100RD(H) ø9.52 [3/8"] ø15.88 [5/8"]
]"4/3[50.91ø]"8/3[25.9ø002P
]"8/7[02.22ø]"8/3[25.9ø052P
Bent equivalent length "M"
Outdoor unit model M (m/bent [ft./bent])
PUHY-P200YKB-A 0.42 [1.38]
PUHY-P250YKB-A 0.42 [1.38]
PUHY-P300YKB-A 0.47 [1.54]
PUHY-P350YKB-A 0.47 [1.54]
*1 90m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
*2 60m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
*3 90m is available. When the piping length exceeds 40m, use one size larger liquid pipe starting with the section of piping where 40m is exceeded and all piping after that point.
In the figure above, if the piping labeled “E” exceeds 40 meters (but does not exceed 90 meters), increase the size of the liquid piping labeled E, f, and g by one size.
*4 30m is available. If the height difference between indoor units exceeds 15 meters (but does not exceed 30 meters), use one-size larger pipes for indoor unit liquid pipes.
In the figure above, if “h1” exceeds 15 meters, increase the size of the liquid piping labeled C, D, E, d, e, f, and g by one size.

19
3. Piping Design AN1 2nd
Selection criteria for joints
Total down-stream Indoor capacity Joint
~ P200 CMY-Y102SS-G2
P201 ~ P400 CMY-Y102LS-G2
P401 ~ P650 CMY-Y202S-G2
P651 ~ CMY-Y302S-G2
*Concerning detailed usage of Joint parts, refer to its Installation Manual.
*The total capacity of the units in the downstream of the branch joint on at least one of the piping lines that
are connected to the branch joint should be 650 or below.
If the total capacity of the units in the downstream of the branch joints on both lines is 650 or above use
two branch joints (CMY-Y302S-G2).
Header selection rule
4-branch Header 8-branch Header 10-branch Header
CMY-Y104-G CMY-Y108-G CMY-Y1010-G
Total down-stream Indoor capacity <=P200 <=P400 <=P650
* CMY-Y104-G can directly connect PUHY-P200YKB, but can NOT directly connect PUHY-P250YKB or above;
*
CMY-Y108-G can directly connect PUHY-P200-450Y(S)KB, but can NOT directly connect PUHY-P500YSKB or above;
* CMY-Y1010-G can directly connect PUHY-P200-600Y(S)KB;
* CMY-Y104-G can NOT connect P200,P250 Indoor, but CMY-Y108, Y1010-G can do;
* Concerning detailed usage of Header parts, refer to its Installation Manual.
Outdoor Twinning Kit
Note1. No Joint after Header; Piping direct to Indoor Unit from Header;
Note2. As bends cause pressure loss on transportation of refrigerant, fewer bends design is better;
Piping length needs to consider the actual length and equivalent length which bends are counted.
Equivalent piping length (m)=Actual piping length+"M" x Quantity of bends.
H (OU above IU)
h1
H' (OU under IU)
h2
1st Joint
Joint
ba
L2
L1
IU
IU IUIU
g
IU
e
IU
d
C
D
IU
f
E
T
S
AB
Header
Capped
IU : Indoor unit , OU : Outdoor unit
Fig. 3-2-1B Piping scheme
c
2m To indoor unit
To indoor unit
To indoor unit xamm2tinuroodnioT
Trap (gas
pipe only)
Upward
incline
Downward
incline
Install the pipes from the outdoor unit to the branch
joint with a downward incline.
If the length of pipe between the branch joint and outdoor
unit exceeds 2 m, provide at rap at a distance 2 m or less
from the branch joint.
OK NG
3-2-2. PUHY-P400-900YSKB-A Piping
Piping length (m [ft.])
htgnel.xaMerugifehtnignipiPmetI
Max. equivalent length
Total piping length S+T+A+B+C+D+E+a+b+c+d+e+f+g 1000 [3280'] -
Distance between OU and OU S+T 10[32'] -
Height between OU and OU h2 0.1[0.3'] -
Farthest IU from OU (L1)
S(T)+A+C+D+E+g / S(T)+A+B+c 165 [541'] 190 [623']
Farthest IU from the first Joint (L2) C+D+E+g / B+c 40 [131'] 40 [131']
Height between OU and IU (OU above IU) H 50 [164'] -
Height between OU and IU (OU under IU) H' 40 [131'] -
Height between IU and IU h1 15 [49'] -
OU: Outdoor Unit, IU: Indoor Unit
For Piping size "S","T", please refer to specification of the Twinning kit CMY-Y100VBK3 at the Outdoor
unit's external drawing.
Piping"B","C","D","E" size selection rule (mm [in.])
Total down-stream Indoor capacity Pipe(Liquid) Pipe(Gas)
]"8/5[88.51ø]"8/3[25.9ø041P~
]"4/3[50.91ø]"8/3[25.9ø002P~141P
]"8/7[02.22ø]"8/3[25.9ø003P~102P
]"8/1-1[85.82ø]"2/1[07.21ø004P~103P
]"8/1-1[85.82ø]"8/5[88.51ø056P~104P
]"8/3-1[39.43ø]"4/3[50.91ø008P~156P
]"8/5-1[82.14ø]"4/3[50.91ø~108P
Piping"a","b","c","d","e","f","g" size selection rule (mm [in.])
)sa
G(epiP)diuqiL(epiPezistinUroodnI
P20,P25,P32,P40,P50,GUF-50RD(H) ø6.35 [1/4"] ø12.70 [1/2"]
P63,P71,P80,P100,P125,P140,GUF-100RD(H) ø9.52 [3/8"] ø15.88 [5/8"]
]"4/3[50.91ø]"8/3[25.9ø002P
]"8/7[02.22ø]"8/3[25.9ø052P
Bent equivalent length "M"
Outdoor unit model M (m/bent [ft./bent])
PUHY-P400YSKB-A 0.50 [1.64]
PUHY-P450YSKB-A 0.50 [1.64]
PUHY-P500YSKB-A 0.50 [1.64]
PUHY-P550YSKB-A 0.50 [1.64]
PUHY-P600YSKB-A 0.50 [1.64]
PUHY-P650YSKB-A 0.50 [1.64]
PUHY-P700YSKB-A 0.70 [2.29]
PUHY-P750YSKB-A 0.70 [2.29]
PUHY-P800YSKB-A 0.70 [2.29]
PUHY-P850YSKB-A 0.80 [2.62]
PUHY-P900YSKB-A 0.80 [2.62]
Outdoor unit
Outdoor unit model Joint model
P450 to P650
P700 to P900
CMY-Y202S-G2
CMY-Y302S-G2
PUHY-P400YSKB
PUHY-P450-650YSKB
PUHY-P700-800YSKB
PUHY-P850-900YSKB
CMY-Y100VBK3
CMY-Y100VBK3
CMY-Y200VBK2
CMY-Y200VBK2
ø12.7[1/2"]
ø15.88[5/8"]
ø19.05[3/4"]
ø19.05[3/4"]
ø28.58[1-1/8"]
ø28.58[1-1/8"]
ø34.93[1-3/8"]
ø41.28[1-5/8"]
Twinning kit Pipe(Liquid) Pipe(Gas)
(mm [in.])
Piping "A" size selection rule
See the table below for the first joint of
the outdoor unit described below.
*1
*2
*3
*4
OU
OU
Note3. Indoor capacity is described as its model size;
For example, PEFY-P32VMA-E, its capacity is P32;
Note4. Total down-stream Indoor capacity is the summary of the model size of Indoors downstream.
For example, PEFY-P25VMA-E+PEFY-P32VMA-E: Total Indoor capacity=P25+P32=P57
Note5. Piping sized determined by the Total down-stream indoor capacity is NOT necessary
to be bigger than the up-stream one.
i.e. A>=B; A>=C>=D
*1 90m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
*2 60m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
*3 90m is available. When the piping length exceeds 40m, use one size larger liquid pipe starting with the section of piping where 40m
is exceeded and all piping after that point.
In the figure above, if the piping labeled “E” exceeds 40 meters (but does not exceed 90 meters), increase the size of the liquid piping labeled E, f, and g by one size.
*4 30m is available. If the height difference between indoor units exceeds 15 meters (but does not exceed 30 meters), use one-size larger pipes for indoor unit liquid pipes.
In the figure above, if “h1” exceeds 15 meters, increase the size of the liquid piping labeled C, D, E, and g by one size.

20
Y SERIES PIPING LIMITATIONS (continued)
3. Piping DesignAN1 2nd
Selection criteria for joints
Total down-stream Indoor capacity Joint
~ P200 CMY-Y102SS-G2
P201 ~ P400 CMY-Y102LS-G2
P401 ~ P650 CMY-Y202S-G2
P651 ~ CMY-Y302S-G2
*The total capacity of the units in the downstream of the branch joint on at least one of the piping lines that
are connected to the branch joint should be 650 or below.
If the total capacity of the units in the downstream of the branch joints on both lines is 650 or above use two
branch joints (CMY-Y302S-G2).
*Concerning detailed usage of Joint parts, refer to its Installation Manual.
Header selection rule
4-branch Header 8-branch Header 10-branch Header
CMY-Y104-G CMY-Y108-G CMY-Y1010-G
Total down-stream Indoor capacity <=P200 <=P400 <=P650
* CMY-Y104-G can directly connect PUHY-P200YKB, but can NOT directly connect PUHY-P250YKB or above;
* CMY-Y108-G can directly connect PUHY-P200-450Y(S)KB, but can NOT directly connect PUHY-P500YSKB or above;
* CMY-Y1010-G can directly connect, PUHY-P200-600Y(S)KB;
* CMY-Y104-G can NOT connect P200,P250 Indoor, but CMY-Y108, Y1010-G can do;
* Concerning detailed usage of Header parts, refer to its Installation Manual.
2nd Outdoor
Twinning Kit
1st Outdoor
Twinning Kit
Note1. No Joint after Header; Piping direct to Indoor Unit from Header;
Note2. As bends cause pressure loss on transportation of refrigerant, fewer bends design is better;
Piping length needs to consider the actual length and equivalent length which bends are counted.
Equivalent piping length (m)=Actual piping length+"M" x Quantity of bends.
H (OU above IU) H' (OU under IU)
h2
1st Joint
Joint
L2
L1
IU
g
IU
e
IU
d
C
D
IU
f
E
T
S
M N
AB
Header
IU : Indoor unit , OU : Outdoor unit
Fig. 3-2-1C Piping scheme
2m To indoor unit
To indoor unit
To indoor unit xamm2tinuroodnioT
Trap (gas
pipe only)
Upward
incline
Downward
incline
Install the pipes from the outdoor unit to the branch
joint with a downward incline.
If the length of pipe between the branch joint and outdoor
unit exceeds 2 m, provide at rap at a distance 2 m or less
from the branch joint.
OK NG
h1
ba
IU IUIU
c
Capped
3-2-3. PUHY-P950-1350YSKB-A Piping
Piping length (m [ft.])
htgnel.xaMerugifehtnignipiPmetI
Max. equivalent length
Total piping length S+T+M+N+A+B+C+D+E+a+b+c+d+e+f+g 1000[3280'] -
-]'23[01T+S+N+MUOdnaUOneewtebecnatsiD
-]'3.0[1.02hUOdnaUOneewtebthgieH
Farthest IU from OU (L1)
M(N)+S+A+C+D+E+g / M(N)+S+A+B+c 165[541'] 190[623']
Farthest IU from the first Joint (L2) C+D+E+g / B+c 40[131'] 40[131']
Height between OU and IU (OU above IU) H 50[164'] -
Height between OU and IU (OU under IU) H' 40[131'] -
Height between IU and IU h1 15[49'] -
OU: Outdoor Unit, IU: Indoor Unit
For Piping size"M","N","S","T", please refer to specification of the Twinning kit
CMY-Y300VBK3 at the Outdoor unit's external drawing.
Piping"B","C","D","E" size selection rule
(mm [in.])
Total down-stream Indoor capacity Pipe(Liquid) Pipe(Gas)
]"8/5[88.51ø]"8/3[25.9ø041P~
]"4/3[50.91ø]"8/3[25.9ø002P~141P
]"8/7[02.22ø]"8/3[25.9ø003P~102P
]"8/1-1[85.82ø]"2/1[07.21ø004P~103P
]"8/1-1[85.82ø]"8/5[88.51ø056P~104P
]"8/3-1[39.4
3ø]"4/3[50.91ø008P~156P
]"8/5-1[82.14ø]"4/3[50.91ø~108P
Piping"a","b","c","d","e","f","g" size selection rule (mm [in.])
)saG(epiP)diuqiL(epiPezistinUroodnI
P20,P25,P32,P40,P50,GUF-50RD(H) ø6.35 [1/4"] ø12.70 [1/2"]
P63,P71,P80,P100,P125,P140,GUF-100RD(H) ø9.52 [3/8"] ø15.88 [5/8"]
]"4/3[50.91ø]"8/3[25.9ø002P
]"8/7[02.22ø]"8/3[25.9ø052P
Bent equivalent length "M"
Outdoor unit model M (m/bent [ft./bent])
PUHY-P950YSKB-A 0.80 [2.62]
PUHY-P1000YSKB-A 0.80 [2.62]
PUHY-P1050YSKB-A 0.80 [2.62]
PUHY-P1100YSKB-A 0.80 [2.62]
PUHY-P1150YSKB-A 0.80 [2.62]
PUHY-P1200YSKB-A 0.80 [2.62]
PUHY-P1250YSKB-A 0.80 [2.62]
PUHY-P1300YSKB-A 0.80 [2.62]
PUHY-P1350YSKB-A 0.80 [2.62]
Outdoor unit
PUHY-P950-1350YSKB CMY-Y300VBK3
ø19.05[3/4"] ø41.28[1-5/8"]
Twinning kit Pipe(Liquid) Pipe(Gas)
(mm [in.])
Piping "A" size selection rule
Outdoor unit model Joint model
P950 to P1350 CMY-Y302S-G2
See the table below for the first joint of
the outdoor unit described below.
*1
*2
*4
*3
*1 90m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
*2 60m is available depending on the model and installation conditions. For more detailed information, contact your local distributor.
*3 90m is available. When the piping length exceeds 40m, use one size larger liquid pipe starting with the section of piping where 40m is exceeded and all piping after that point.
In the figure above, if the piping labeled “E” exceeds 40 meters (but does not exceed 90 meters), increase the size of the liquid piping labeled E, f, and g by one size.
*4 30m is available. If the height difference between indoor units exceeds 15 meters (but does not exceed 30 meters), use one-size larger pipes for indoor unit liquid pipes.
In the figure above, if “h1” exceeds 15 meters, increase the size of the liquid piping labeled C, D, E, and g by one size.
OU OU
OU
Note3. Indoor capacity is described as its model size;
For example, PEFY-P32VMA-E, its capacity is P32;
Note4. Total down-stream Indoor capacity is the summary of the model size of Indoors downstream.
For example, PEFY-P25VMA-E+PEFY-P32VMA-E: Total Indoor capacity=P25+P32=P57
Note5. Piping sized determined by the Total down-stream indoor capacity is NOT necessary
to be bigger than the up-stream one.
i.e. A>=B; A>=C>=D