Refrigerant Piping Connections - York MKL/MKM 25 Technical Manual

7 - REFRIGERANT PIPING CONNECTIONS

Prefabricated refrigerant piping is available as an accessory. If this is not 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 inter- connecting
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 pump 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.
High pressure
Low pressure
Manifold
Pressure tap
If piping length exceeds 7.5 meters, add 40g of refrigerant
R407C per extra meter.
Table 2 - Maximum piping lengths
Unit size 25
D (m) 20
L (m) 25
H (m) 22
Note : Where the difference in elevation is greater than
5 meters, install an oil trap every 5 meters.
8
CASSETTE
02_MKL-MKM.p65
Gas valve
Liquid valve
35 45 55
20 24 24
25 30 30
22 26 26
8
Outdoor unit
Gas line
Liquid line
R407C
* Note : The expansion device is located in the outdoor unit.
L
L
H
13/6/02, 11:08 am
YORK CASSETTE (EN) 035T76015-000
Indoor unit
D