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REFRIGERANT PIPING
WORK
5.3 REFRIGERANT PIPING WORK
Provide the refrigerant pipe in the field.
Make sure that the refrigerant pipe should be connected to the
same refrigerant cycle unit.
Position of Piping Connection
¡
−
214
40
54
151
63
Outdoor Unit Connecting Side
Selecting Piping Size
¡
−
a) Select the size for the high/low pressure gas pipe, low pressure gas pipe and gas pipe according to the table 5.1. The
size depends on the indoor unit total capacity connected downstream of the CH unit.
b) In case that the piping size from Table 5.1 and the piping connection size for CH unit from Table 5.2 are different, use an
accessory pipe according to the item Piping connection (next page).
c)
As for the multi-kit branch or header branch, refer to Technical Catalog for Outdoor Unit.
Table 5.1 Connected Indoor Unit Capacity and Piping Size
Connected
Indoor Unit
Model
Capacity
(HP)
0.8~1.5
CH-6.0N2
1.6~4.0
4.1~6.0
6.1~8.0
CH-10.0N2
8.1~10.0
*
:
In case that a branch is located downstream of the CH unit and also the
connected indoor unit capacity is 0.8~1.5HP, use Ø15.88 for the gas pipe.
Piping Work for CH Unit
•
Perform the piping work for CH unit according to the following table.
Upstream
CH Unit
L
Indoor
Unit
18
Service Cover for
Electronic Expansion Valve
38
Low Pressure
Gas Pipe Connection
(
Flare Nut)
Ø19.05
89
Service Cover for
Electrical Box
High/Low Pressure
82
Gas Pipe Connection
(
Flare Nut)
Ø15.88
Model
CH-6.0N2
CH-10.0N2
Low
High/Low
Pressure
Pressure
Gas Pipe
Gas Pipe
Gas Pipe
(mm)
(mm)
15.88
12.7
Ø
Ø
15.88
12.7
Ø
Ø
19.05
15.88
Ø
Ø
19.05
15.88
Ø
Ø
22.2
19.05
Ø
Ø
a
CH Unit
c
Hb
PMML0309A rev.1 - 09/2015 - P5416573
376
301
38
301
B
Size
Size
A
B
15.88
89
19.05
96
Table 5.2 Piping Connection Size for CH Unit
Model
(mm)
CH-6.0N2
12.7
Ø
*
CH-10.0N2
15.88
Ø
15.88
Ø
Upstream
19.05
Ø
Low Pressure
22.2
Ø
Gas Pipe
High/Low Pressure
Gas Pipe
Downstream
b
Total Piping Length
between CH Unit
Height Difference
Indoor
Units Connected to
Ha
Unit
the Same CH Unit
Indoor
Unit
Height Difference
between CH Units
Unit: mm
Electrical Box
Gas Pipe Connection
(Available for
(
A Flare Nut)
Ø
Both Sides)
111
Indoor Unit Connecting Side
Low
High/Low
Pressure
Pressure
Gas Pipe
Gas Pipe
(mm)
(mm)
19.05
15.88
Ø
Ø
19.05
15.88
Ø
Ø
Multi-Kit
Gas Pipe
CH Unit
Indoor
Unit
Condition of Piping Work
Item
Allowable Piping Length
CH-6.0N2
L
CH-10.0N2
a+b+c
and Indoor Unit
between Indoor
Ha
Hb
Gas Pipe
(mm)
15.88
Ø
19.05
Ø
Downstream
Indoor
Unit
within 30m
within 10m
within 4m
within 15m
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