YORK Technical Guide Code 035T76009-000
AIR BLOWER
7
Prefabricated refrigerant piping is available as an
accessory. If this is used, piping and insulating
materials employed must be compatible with this type
of installation.
The pre-charged outdoor unit does not require
charging if piping length is 5 m or less. However, the
interconnecting piping and the indoor unit must be
pumped down before releasing R407C refrigerant into
them from the outdoor unit.
1 - Remove the cap from the service valve.
2 - Connect the line to a vacuum pump and down to 5 pa.
3 - When pump down is finished, wait 15 minutes to
detect potential circuit leakage. Open service valves
on the outdoor unit.
If piping length exceeds 5 meters, add 10 g of refrigerant
R407C per extra meter.
Note
The expansion device is located in the outdoor unit.
Low pressure
High pressure
Pressure tap
Liquid valve
Gas valve
Table 2 - Maximum piping lengths
Unit size
D (m)
L (m)
H (m)
7
10
15
12
9
10
15
12
12
12
18
15
18
12
18
15
25
20
25
22
35
20
25
22
45
24
30
26
55
24
30
26
Note
Where the difference in elevation is greater than 5 meters,
install an oil trap every 5 meters.
L
D
L
H
Collector
7 - REFRIGERANT PIPING CONNECTIONS
Outdoor unit
Indoor unit
R407C
Gas line
Liquid line
02_MAL-MAM.p65
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