Daikin RXYCQ24, RXYCQ28, RXYCQ32, RXYCQ38, RXYCQ40 Installation manuals
ADDENDUM
INSTALLATION MANUAL
System air conditioner
RXYCQ24
RXYCQ28
RXYCQ32
RXYCQ38
RXYCQ40
RXYCQ24
RXYCQ28
RXYCQ32
RXYCQ38
RXYCQ40
VRV Classic System air conditioner
Addendum
Installation manual
CONTENTS Page
1. Introduction................................................................................ 1
1.1. Combination................................................................................. 1
1.2. Optional accessories ................................................................... 1
2. Refrigerant piping ...................................................................... 1
3. Leak test and vacuum drying..................................................... 5
4. Field wiring ................................................................................ 5
4.1. Power circuit and cable requirements.......................................... 5
4.2. System examples5
4.3. Field line connection: transmission wiring and
cool/heat selection ....................................................................... 6
5. Additional refrigerant charge ..................................................... 6
6. Before operation........................................................................ 7
6.1. Field setting ................................................................................. 7
1. INTRODUCTION
This manual contains additional instructions for the installation of a
VRV Classic multiple outdoor unit system. For general instructions
regarding the installation of the outdoor units, refer to the VRV classic
installation manual.
1.1. Combination
Refer to chapter "1.1.Combination" of the installation manual.
■ Total capacity/quantity of indoor units
Total capacity of indoor
Standard combination of outdoor units
RXYCQ24 =
RXYCQ28 =
RXYCQ32 =
RXYCQ38 =
RXYCQ40 =
NOTE
■ There are restrictions on the refrigerant pipe
RXYCQ10+RXYCQ14
RXYCQ10+RXYCQ18
RXYCQ14+RXYCQ18
RXYCQ18+RXYCQ20
RXYCQ20+RXYCQ20
connection order between outdoor units during
installation in case of a multiple outdoor unit
system.
Install according to the following restrictions.
The capacities of outdoor units A and B must fulfill
the following restriction conditions: A≥B.
■ For RXYCQ Multi only 2 outside units can be
connected.
units
300~670
350~790
400~960
475~1140
500~1200
1.2. Optional accessories
Refer to chapter "1.3.Optional accessories" of the installation
manual.
■ Refrigerant branching kit (for R410A only: Always use an
appropriate kit dedicated for your system.)
Refnet header Refnet joint
KHRQ22M29H KHRQ22M20T
KHRQ22M64H KHRQ22M29T9
KHRQ22M75H KHRQ22M64T
KHRQ22M75T
■ Outdoor unit multi connection piping kit (For R410A only: Always
use an appropriate kit dedicated for your system.)
Number of outdoor units connected
2
BHFQ22P1007
■ Pipe size reducer (For R410A only: Always use an appropriate
kit dedicated for your system.)
RXYCQ22~40
KHRQ22M75T KHRQ22M75H
2. REFRIGERANT PIPING
Refer to chapter "6.Refrigerant piping" of the installation manual.
1 Outdoor units installed in a multiple outdoor unit system:
RXCYQ24~40
■ Front connection:
Remove the stop valve cover to connect (A).
■ Bottom connection:
Remove the knock holes on the bottom frame and route the
piping under the bottom frame (B).
A B
2
1
8
4
3
1
8
8
6
5
3
2
8
7
8
1 To indoor units
2 Outdoor unit multi connection piping kit (first
Addendum Installation manual
1
12
branch)
AB
1.1 Precautions when connecting piping between outdoor
units (multiple outdoor unit system)
■ The 8 Hp unit type can not be used as an independent unit in
a multi system.
■ To connect the piping between outdoor units, an optional
multi connection piping kit BHFQ22P1007 is always required.
When installing the piping, follow the instructions in the
installation manual that comes with the kit.
■ Only proceed with piping work after considering the
limitations on installing listed in the RXYCQ installation
manual, always referring to the installation manual delivered
with the kit.
VRV Classic System air conditioner
RXYCQ24~40
4P378497-1 – 2014.07
1.2 Possible installation patterns and configurations
■ The piping between the outdoor units must be routed level or
slightly upward to avoid the risk of oil retention into the piping
side.
Pattern 1
Correct configuration
≥200 mm
1
1
1 To indoor unit
Pattern 2
1
1
1 To indoor unit
Prohibited patterns: change to pattern 1 or 2.
1
1
2
1 To indoor unit
2 Piping between outdoor units
2
■ To avoid the risk of oil retention to the outmost outdoor unit,
always connect the stop valve and the piping between
outdoor units as shown in the 4 correct possibilities of the
figure below.
11
1 To indoor unit
■ If the piping length between the outdoor units exceeds 2 m,
create a rise of 200 mm or more in the gas line within a
length of 2 m from the kit.
- If ≤2 m
1
2
1 To indoor unit
2 Piping between outdoor units
≤2 m
- If ≥2 m
≥200 mm
1
1 To indoor unit
2 Piping between outdoor units
≤2 m
2
≥2 m
Prohibited patterns: change to pattern 1 or 2.
1
2
1 To indoor unit
2 Oil collects to the outmost outdoor unit.
2
1
22
Change to configuration as in figures below
11
22
1 To indoor unit
2 Oil collects to the outmost outdoor unit when the system
stops.
RXYCQ24~40
VRV Classic System air conditioner
4P378497-1 – 2014.07
Addendum Installation manual
2
2.1. Example of connection
indoor unit
refnet joint
refnet header
outdoor multi connection piping kit
H1
i
8
H2
h
g
f
cde
a
123 456 7
b
H1
i
8
H2
h
g
H3
f
a
cde
123 456 7
b
r≤10 m (Approximate length:
max. 13 m)
t≤10 m (Approximate length:
max: 13 m)
r t
(a)
[Example]
in case of refnet header;
indoor units 1+2+3+4+5+6+7+8
H2
k
78
j
B
h
g
i
b
A
123456
a
cde f
H1
p
H1
8
H2
g
Branch with refnet joint Branch with refnet joint and refnet header Branch with refnet header
1234567
hijklmn
ABCDEFG
ab c d e f
H2
k
78
j
B
i
gh
b
A
H3
de f
123456
a
c
H1
p
H1
8
H2
7
g
EFG
D
H3
123 456
hi j klmn
ABC
abcdef
Pipe length between outdoor(*) and indoor units ≤135 m
[Example] unit 8: a+b+c+d+e+f+g+p≤135 m [Example] unit 6: a+b+h≤135 m, unit 8: a+i+k≤135 m [Example] unit 8: a+i≤135 m
Equivalent pipe length between outdoor(*) and indoor units ≤155 m (Assume equivalent pipe length of refnet joint to be 0.5 m and of the refnet header to be 1.0 m. (for
calculation purposes))
Total piping length from outdoor unit* to all indoor units ≤300 m
Difference in height between outdoor and indoor units (H1)≤30 m.
Difference in height between adjacent indoor units (H2)≤15 m
Difference in height between outdoor unit (main) and outdoor unit (sub) (H3)≤5 m
Pipe length from first refrigerant branch kit (either refnet joint or refnet header) to indoor unit ≤40 m (See note 1 on next page)
units connected below the refnet header.
Indoor capacity type Refrigerant branch kit name
• Choose from the following table in accordance with the total capacity of all the indoor
• Note: 250 type cannot be connected below the refnet header.
How to select the refnet header
Choose from the following table in accordance with the capacity of the outdoor unit.
Outdoor unit capacity type Refrigerant branch kit name
RXYCQ8 KHRQ22M20T
•When using refnet joints at the first branch counted from the outdoor unit side.
[Example] unit 8: b+c+d+e+f+g+p≤40 m [Example] unit 6: b+h≤40 m, unit 8: i+k≤40 m [Example] unit 8: i≤40 m
How to select the refnet joint
(a) See note 2 on next page
<290 KHRQ22M29H (Max. 8 branch)
290≤x<640 KHRQ22M64H (Max. 8 branch)
≥640 KHRQ22M75H (Max. 8 branch)
RXYCQ10~12 KHRQ22M29T9
RXYCQ14~20, 24 KHRQ22M64T
RXYCQ28, 32, 38, 40 KHRQ22M75T
2BHFQ22P1007
Number of outdoor units Branch kit name
• Choose from the following table in accordance with the number of outdoor units.
How to choose an outdoor multi connection piping kit (needed if the outdoor
unit capacity type is RXYCQ24 or more.)
[Example]
in case of refnet joint B; indoor units 7+8,
in case of refnet header; indoor units 1+2+3+4+5+6
the total capacity index.
Indoor capacity type Refrigerant branch kit name
<200 KHRQ22M20T
200≤x<290 KHRQ22M29T9
290≤x<640 KHRQ22M64T
•For refnet joints other than the first branch, select the proper branch kit model based on
≥640 KHRQ22M75T
[Example]
in case of refnet joint C; indoor units 3+4+5+6+7+8
One outdoor unit
installed
(RXYCQ8~20)
(BHFQ22P1007) for the multi installation of outdoor units. Selection method is as
• Use the outdoor unit multi connection piping kit that is sold separately as an option
Example of connection
(Connection of 8 indoor units Heat pump system)
Addendum Installation manual
3
shown in the right table.
are sold separately as an option of the M-type series and do not use T-joints.
• Do not use the outdoor unit multi connection piping kit (BHFQ22M909+1359) that
Outdoor units
installed in a
multiple outdoor
unit system
(RXYCQ24~40)
Actual pipe length
Install the joint part ( part in the figure) of the outdoor unit multi connection piping kit
horizontally with attention to the installation restrictions described in "connecting the
refrigerant piping".
(*) If the system capacity is 24 or more, re-read to the first outdoor branch as seen from
the indoor unit.
Equivalent length
Total extension
length
Actual pipe length Piping length from outdoor branch to outdoor unit ≤10 m. Approximate length: max. 13 m
Difference in
height
Difference in
Between outdoor and indoor units
Between outdoor branch and outdoor unit (Only for
RXYCQ24 or more)
Between outdoor and indoor units
Maximum allowable length
height
Difference in
height
Between indoor and indoor units
Between outdoor and outdoor units
Allowable height
Allowable length after the branch Actual pipe length
Refrigerant branch kit selection
Refrigerant branch kits can only be used with R410A.
VRV Classic System air conditioner
Example of downstream indoor units
RXYCQ24~40
4P378497-1 – 2014.07
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