York JVOHQ Series Installation & Maintenance Manual page 36

6.4.6 Piping Connection
(1) Confirm that the stop valve is fully closed.
(2) As shown in Figure 6.2, when you weld the gas side pipe, use a metal plate to protect the
compressor and the sound insulation cover of the compressor. The welding sparks should not
burn the valve body.
(3) Connect the indoor unit and the outdoor unit with the refrigerant piping and make sure the
refrigerant piping does not contact with the weak parts of the facility (wall, false ceiling, etc.).
Otherwise, you can hear a noise due to the vibration of the pipe.
(4) When tightening the flare nut, tighten it with the torque specified in Table 6.3. During the welding
operation, the pipe interiors should be filled with nitrogen for protection.
(5) Apply thermal insulation to the gas & liquid pipes when performing assembling work.
(6) After connecting the pipes, install a pipe baffle on the unit. If not, snow, rain, and so on can
damage the unit.
(according to EN 12735-1 and EN 12735-2)
Metric series
(mm)
6
8
10
12
15
18
● Pipe valve connection details.
Liquid side piping
(field-supplied)
NOTE:
1. Ensure to remove the cap (1) of the high pressure gas stop valve.
2. Perform flare machining according to the sketch in section 6.2.
Table 6.3 Tightening the Flare Nut
Nominal outside diameter
Imperial series
(mm)
6,35
7,94
9,52
12,7
15,88
19,06
JVOH 080/200
Gas side stop valve
Gas side piping
Liquid side
stop valve (accessory)
Direct
(field-supplied)
Right-angle elbow
(field-supplied)
Gas side piping
(field-supplied)
JVOH 100
Gas side
stop valve
Liquid side
stop valve
Liquid side piping
(field-supplied)
Gas side piping
(field-supplied)
Minimum wall
Thickness
(mm)
(in)
0,8
1/4 0,80
5/16 0,80
0,80
3/8 0,80
0,80
0,80
1/2 0,80
0,80
5/8 0,95
1,00
3/4 1,00
JVOH 120/180
Liquid side
stop valve
Liquid side piping
random accessory
Liquid side piping
field-supplied
JVOH 140/160/220/240
Liquid side
stop valve
Liquid side piping
(field-supplied)
Silencer
32
Tightening torque
(N·m)
14 -- 18
14 -- 18
33 -- 42
33 -- 42
33 -- 42
33 -- 42
50 -- 62
50 -- 62
63 -- 77
63 -- 77
90 -- 110
90 -- 110
Gas side
stop valve
Gas side piping
(accessory)
Direct
(field-supplied)
Right angle elbow
(field-supplied)
Gas side piping
(field-supplied)
Gas side
stop valve
Gas piping
(accessory)
Direct
(field-supplied)
Right angle elbow
(field-supplied)
Gas side piping
(field-supplied)