Example of connection
(Connection of 8 indoor units)
Indoor
unit
side
Outdoor
unit
side
1 2
BS
Unit
Suction gas pipe
HP/LP gas pipe
Liquid pipe
(Suction) gas pipe
Liquid pipe
Piping from outdoor unit to BS unit
Piping from BS unit to indoor unit or
Piping from Refrigerant branch kit to
indoor unit used as cooling only
(Bold):3 pipes
(Thin):2 pipes
(*1) “ ” Indicate the Outdoor unit multi
connection piping kit.
(*2) In case of multi outdoor system, re-read
“outdoor unit” to “the first Outdoor unit
multi connection piping kit” as seen from
the indoor unit.
Branch with REFNET joint Branch with REFNET joint and header Branch with REFNET header
Multi
outdoor
system
(RQCEQ)
Maximum
allowable
length
Allowable
height
difference
Allowable length after the branch
Between outdoor unit (*2)
and indoor unit
Between first outdoor unit multi
connection piping kit and outdoor unit
(in case of multi system)
Between outdoor and indoor units
Between indoor and indoor units
Between outdoor and outdoor units
Actual pipe
length
Equivalent
length
Actual and
Equivalent
pipe length
Actual pipe
length
Difference in height
Difference in height
Difference in height
Total extension length
Pipe length between outdoor unit (*2) and indoor unit ≤ 120m
Example 8 : a + b + c + d + e + s ≤ 120m
Example 6 : a + b + ≤ 120m, 8 : a + m + n + p ≤ 120m
Example 8 : a + o
≤
120m
Total piping length from outdoor unit (*2) to all indoor unit ≤ 300m
Actual pipe length from first outdoor unit multi connection piping kit to outdoor unit ≤ 10m
Equivalent pipe length from first outdoor unit multi connection piping kit to outdoor unit ≤ 13m
Actual pipe length from first refrigerant branch kit (either REFNET joint or REFNET header) to indoor unit ≤ 40m
Example 8 : b + c + d + e + s ≤ 40m
Difference in height between outdoor unit and indoor unit (H1) ≤ 50m (Max 40m if the outdoor unit is below)
Difference in height between adjacent indoor units (H2) ≤ 15m
Difference in height between adjacent outdoor units (H3) ≤ 5m
Outdoor unit
r
≤
10m
(Equivalent length
≤
13m)
u + s
≤
10m
(Equivalent length
≤
13m)
u + t
≤
10m
(Equivalent length
≤
13m)
Example 6 : b + ≤ 40m, 8: m + n + p ≤ 40m Example 8 : o
≤
40m
B1 ~ B4
: BS Unit
1 ~ 6 :
Indoor unit (Cool/Heat selection possible)
7 , 8 : Indoor unit (Cooling only)
B1 ~ B5
: BS Unit
1 ~ 4 , 7 , 8 :
Indoor unit (Cool/Heat selection possible)
5 , 6 : Indoor unit (Cooling only)
B1 ~ B4
: BS Unit
1 ~ 6 : Indoor unit (Cool/Heat selection possible)
7 , 8 : Indoor unit (Cooling only)
r
t
s
u
1
2
Outdoor unit multi connection piping kit and
Refrigerant branch kit selection
• Refrigerant branch kit must be used to
prescribed kit.
• Use this table for kit selection.
How to select the REFNET joint How to select the REFNET header
When using REFNET joint at the first branch counted from the outdoor unit side,
choose from the following table in accordance with the outdoor unit capacity type.
(Example : REFNET joint A)
Choose from the following table in accordance with the total capacity index of all
the indoor units connected below the REFNET header.
250 type indoor unit can not be connected below the REFNET header.
How to select the outdoor unit multi connection piping kit
(This is required when the system is multi outdoor unit system.)
Choose from the following table in accordance with the number of outdoor units.
Choose the REFNET joints other than the first branch from the following table in accordance
with the total capacity index of all the indoor units connected below the REFNET joint.
Outdoor unit capacity type
Q280 type
Q360~712 type
Q744 type ~
Indoor unit total capacity index
x < 200
200 ≤ x < 290
290 ≤ x < 640
640 ≤ x
Refrigerant branch kit name
KHRP25A33T
KHRP25A72T+KHRP25M72TP
KHRP25A73T+KHRP25M73TP
3 pipes
KHRP25A22T
KHRP25A33T
KHRP25A72T+KHRP25M72TP
KHRP25A73T+KHRP25M73TP
2 pipes
KHRP26A22T
KHRP26A33T
KHRP26A72T
Refrigerant branch kit name
Indoor unit total capacity index
x < 200
200 ≤ x < 290
290 ≤ x < 640
640 ≤ x
Number of outdoor unit
2 units
3 units
4 units
Connecting piping kit name
BHFP26P36C
BHFP26P63C
BHFP26P84C
3 pipes
KHRP25M33H
KHRP25M72H+KHRP25M72HP
KHRP25M73H+KHRP25M73HP
2 pipes
KHRP26M22H or KHRP26M33H
KHRP26M33H
KHRP26M72H
KHRP26M73H+KHRP26M73HP
Refrigerant branch kit name
Example for indoor units
connected downstream
Example REFNET joint C : Indoor units 5 + 6 + 7 + 8
Example REFNET joint B : Indoor units 7 + 8
Example REFNET header : Indoor units 1 + 2 + 3 + 4 + 5 + 6
Example REFNET header :
Indoor units 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8
Outdoor unit
REFNET joint (A~G)
First outdoor unit multi connection piping kit
Outdoor unit Outdoor unit
REFNET joint (A, B)
REFNET header
REFNET header
Equivalent pipe length between outdoor unit (*2) and indoor unit ≤ 150m (Note 1)
(Assume eqivalent pipe length of REFNET joint to be 0.5m, that of REFNET header to be 1m, that of BSVQ100, 160 to be 4m, that of BSVQ250 to be 6m for calculation purposes)
(In case of BSV4Q100PV1 and BSV6Q100PV1 (combined type BS unit), calculate at 4m per 1 unit.)
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