Hitachi CH-UNIT Installation And Operation Manual page 18

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