Hitachi CH-10.0N1, Installation And Operation Manual

Page: 18 / 23

18
PMML0204 rev.0-05/2010
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
¡
Selecting Piping Size
a) Select the size for the high 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
model
Connected
Indoor Unit
Capacity
(HP)
Low
Pressure
Gas Pipe
(mm)
High
Pressure
Gas Pipe
(mm)
Gas Pipe
(mm)
CH-6.0N1
0.8~1.5
Ø
15.88
Ø
12.7
Ø
12.7
T
1.6~4.0
Ø
15.88
Ø
12.7
Ø
15.88
4.1~6.0
Ø
19.05
Ø
15.88
Ø
15.88
CH-10.0N1
6.1~8.0
Ø
19.05
Ø
15.88
Ø
19.05
8.1~10.0
Ø
22.2
Ø
19.05
Ø
22.2
T
: 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 Ø 15.88 for the gas pipe.
Table 5.2 Piping Connection Size for CH Unit
model
Low
Pressure
Gas Pipe
(mm)
High
Pressure
Gas Pipe
(mm)
Gas Pipe
(mm)
CH-6.0N1
Ø
15.88
Ø
15.88
Ø
15.88
CH-10.0N1
Ø
19.05
Ø
19.05
Ø
19.05
Upstream Downstream
Multi-Kit
Gas Pipe
CH Unit
Low Pressure
Gas Pipe
High Pressure
Gas Pipe
Indoor
Unit
Indoor
Unit
•
Piping Work for CH Unit
Perform the piping work for CH unit according to the following table.
Unit: mm
Dimension
model
A B C
CH-6.0N1 15.88 82 89
CH-10.0N1 19.05 89 96
Service Cover for
Electronic Expansion Valve
Electrical Box
Indoor Unit Connecting Side
Outdoor Unit Connecting Side
Gas Pipe Connection
(Available for
Both Sides)
214
376
301
301
111
B C
38 38
40
54
151 63
39
180
191
25
20
Service Cover for
Electrical Box
High Pressure
Gas Pipe Connection
Low Pressure
Gas Pipe Connection
(
Ø
Flare Nut)
(
Ø
Flare Nut)
(
Ø
Flare Nut)
Upstream
CH Unit
CH Unit
Downstream
Indoor
Unit
Indoor
Unit
Indoor
Unit
Hb
L
Ha
a
c
b
Condition of Piping Work
Item Allowable Piping Length
Total Piping Length
between CH Unit
and Indoor Unit
L
a+b+c
CH-6.0N1 within 30m
CH-10.0N1 within 10m
Height Difference
between Indoor
Units Connected to
the Same CH Unit
Ha within 4m
Height Difference
between CH Units
Hb within 15m
REFRIGERANT PIPING
WORK