6 720 874 421 (2017/04) ZA Mini VRF Heat Pump Outdoor Unit
6 | INSTALLING THE CONNECTIVE PIPEWORK
4.5 Confirmation for the diameters of outdoor unit
connecting pipes
Table 4-4 R410A outdoor unit connecting pipes diameters
Total capactiy
of the
outdoor units
Main pipe size when the total
equivalent pipework length of liquid
+ gas side is <90 m
Main pipe size when the total
equivalent pipework length of liquid
+ gas side is ≥90 m
gas
side
(inches)
liquid
side
(inches)
The first Line
Branch Pipe
gas
side
(inches)
liquid
side
(inches)
The first Line
Branch Pipe
A<160 Ø15.9 Ø9.5 IDU - 01 Ø19.1 Ø9.5 IDU - 01
160≤A<230 Ø19.1 Ø9.5 IDU - 01 Ø22.2 Ø9.5 IDU - 02
NOTE
• When installing branch joints ensure there is at least 0.5 m of straight
pipe before and after the branch joint;
• The straight distance between branchpipes must be at least 0.5 m;
• The straight distance where the branch pipes connect to the indoor
unit must be at least 0.5 m;
• Branch header must be connected with the indoor units directly,
further branch connections are not allowed.
• Select branch joint
• Select the branch joint required by the total designed capacity of the
indoor units which it connects to. If this capacity is more than that of
the outdoor unit, then select the connection according to the outdoor
unit.
• The selection of branch header depends on the quantity of branches
it connects to.
■ Connection method
Table 4-5
Gas side Liquid side
8kW Flaring Flaring
10.5kW Flaring Flaring
12kW Flaring Flaring
14kW Flaring Flaring
16kW Flaring Flaring
18kW Flaring Flaring
Indoor unit Flaring Flaring
Branch pipe Brazing or Flaring Brazing or Flaring
■ Pipework sizes at the branch pipe
Table 4-6
Refrigerant Indoor Unit
Capacity
A(x100W)
Gas Side (Ø) Liquid Side (Ø)
R410A A≤45 12.7(Flaring nut) 6.4(Flaring nut)
A≥56 15.9(Flaring nut) 9.5(Flaring nut)
■ Pipe diameter of the connections onto the outdoor unit.
Table 4-7
Pipework
side
MODEL
(kW)
Pipe diameter of outdoor
unit‘s connections (inches)
Gas Side Liquid Side
8 Ø15.9 Ø9.5
10.5 Ø15.9 Ø9.5
12 Ø15.9 Ø9.5
14 Ø15.9 Ø9.5
16 Ø19.1 Ø9.5
18 Ø19.1 Ø9.5
Table 4-8
Outdoor Unit
(kW)
Capacity of
Outdoor unit
(horse power)
Maximum
Quantity of
Indoor units
Sum Capacity of
Indoor unit (horse-
power)
8 2.5 4 45%~130%
10.5 3 5 45%~130%
12 4 6 45%~130%
14 5 6 45%~130%
16 6 7 45%~130%
18 6.5 9 45%~130%
When connecting more than one indoor unit, the largest capacity connected
should be less than 8KW.
When the total capacity of the indoor units is greater than 100% of the
outdoor units capacity, ensure you turn the indoor units on one by one one.
Too many at once will cause damage to the compressor.
When the total capacity of the indoor units is greater than or equal to
16.8 kW, the size of primary gas pipe should be enlarged from Ø16 to Ø19.
Table 4-9
Capacity
ranking
Capacity
(horsepower)
Capacity
ranking
Capacity
(horsepower)
18 0.6 80 2.5
22 0.8 10.5 3
28 1 120 4
36 1.25 140 5
45 1.7 160 6
56 2
■ When the outdoor unit connects to one indoor unit
Table 4-10
MODEL
(kW)
The max height drop (m)
The length of
refrigerant pipe
(m)
The number
of bends
When out-
door
unit is top
When
outdoor unit is
bottom
8 25 20 50
less than 10
10.5 25 20 50
12 25 20 50
14 25 20 50
16 25 20 50
18 25 20 50
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