Daikin VRV Series - Refrigerant Pipe Selection

• Outdoor Units • VRV HEAT PUMP • RXYHQ12-36P(8)
1
10
• VRV Systems • Outdoor Units
75
10 Installation
10 - 3 Refrigerant pipe selection
RXQ-P(A)
RXYQ-P(8)
RXYHQ-P8
4PW48461-1
Example of connection (Connection of 8 indoor units Heat pump system)
•Use the outdoor unit multi connection piping kit that is sold separately as an option (BHFQ22P1007+1517) for the multi installation of outdoor units. Selection method is as shown in the right table. •Do not use the outdoor unit multi connection piping kit (BHFQ22M909) that are sold separately as an option of the M-type series and do not use T-joints.
Branch with refnet joint Branch with refnet joint and refnet header Branch with refnet header
One outdoor unit installed (RX(Y)Q5~18 + RXYHQ12) Outdoor units installed in a multiple outdoor unit system (RXYQ20~54+
RXYHQ16~36)
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 RXY(H)Q20 or more, re-read to the first outdoor branch as seen from the indoor unit. Maximum allowable length
Between outdoor and indoor units
Actual pipe length
Pipe length between outdoor(*) and indoor units 165 m [Example] unit 8: a+b+c+d+e+f+g+p165 m [Example] unit 6: a+b+h165 m, unit 8: a+i+k165 m [Example] unit 8: a+i165 m
Equivalent length
Equivalent pipe length between outdoor(*) and indoor units 190 m (Assume equivalent pipe length of refnet joint to be 0.5 m and of the refnet headerheader branch pipe to be 1.0 m. (for calculation purposes))
Total extension length
Total piping length from outdoor unit* to all indoor units  1000 m
Between outdoor branch and outdoor unit (Only for RXY(H)Q20 or more)
Actual pipe length
Piping length from outdoor branch to outdoor unit  10 m. Approximate length: max. 13 m
Allowable height
Between outdoor and indoor units
Difference in height
Difference in height between outdoor and indoor units (H1)50 m (40 m if outdoor unit is located in a lower position).
Between indoor and indoor units
Difference in height
Difference in height between adjacent indoor units (H2)15 m
Between outdoor and outdoor units
Difference in height
Difference in height between outdoor unit (main) and outdoor unit (sub) (H3)5m
Allowable length after the branch
Actual pipe length
Pipe length from first refrigerant branch kit (either refnet jointline branch pipe or refnet headerheader branch pipe) to indoor unit 40 m (See note 1 on next page) [Example] unit 8: b+c+d+e+f+g+p40 m [Example] unit 6: b+h40 m, unit 8: i+k40 m [Example] unit 8: i40 m
Refrigerant branch kit selection Refrigerant branch kits can only be used with R410A.
How to select the refnet joint
• When using refnet joints at the first branch counted from the outdoor unit side.
Choose from the following table in accordance with the capacity of the outdoor unit.
• For refnet jointsline branch pipes other than the first branch, select the proper branch kit
model based on the total capacity index.
How to select the refnet header
• Choose from the following table in accordance with the total capacity of all the
indoor units connected below the refnet header.
• Note: 250 type cannot be connected below the refnet header.
How to choose an outdoor multi connection piping kit (needed if the outdoor unit capacity type is RXY(H)Q20 or more.)
• Choose from the following table in accordance with the number of outdoor units.
Example of downstream indoor units
[Example] in case of refnet joint C; indoor units 3+4+5+6+7+8
[Example] in case of refnet joint B; indoor units 7+8, in case of refnet header; indoor units 1+2+3+4+5+6
[Example] in case of refnet header; indoor units 1+2+3+4+5+6+7+8
indoor unit refnet joint refnet header outdoor multi connection piping kit
ab c d e f
g
H1
p
ABCDEFG
1234567
8
H2
hijklmn
H1
H2
a
i
b
cde f
g
h
k
j
78
A
B
123456
a
H1
H2
cde
f
g
h
i
b
123 456 7
8
ABC
D
EFG
abcdef
g
8
H2
H1
H3
p
hi j kl mn
123456 7
H1
H2
a
i
b
c
123456
k
j
78
H3
A
B
de f
gh
H1
H3
a
H2
cde
f
g
h
i
b
123 456 7
8
rs t
r10 m (Approximate length: max. 13 m) s10 m (Approximate length: max: 13 m) t10 m (Approximate length: max: 13 m)
Outdoor unit capacity type Refrigerant branch kit name RX(Y)Q5 KHRQ22M20TCZ-P20BK12Q RX(Y)Q8+10 KHRQ22M29T9CZ-P29BK12QA RX(Y)Q12~18U RXYQ20+22 RXYHQ12 + RXYHQ16~22
KHRQ22M64TCZ-P64BK12Q
RXYQ24~54 RXYHQ24~36
KHRQ22M75TCZ-P75BK12Q
Indoor capacity type Refrigerant branch kit name
<200 KHRQ22M20T 200x<290 KHRQ22M29T9 290x<640 KHRQ22M64T 640 KHRQ22M75T
Indoor capacity type Refrigerant branch kit name
<290 KHRQ22M29H (Max. 8 branch) 290x<640 KHRQ22M64H (Max. 8 branch)
a
a. See note 2 on next page
640 KHRQ22M75H (Max. 8 branch)
Number of outdoor units Branch kit name
2 BHFQ22P1007 3 BHFQ22P1517