Canovate Can BREEZE Series Operating And Maintenance Instructions Manual page 40

Do not attempt to turn service valve rod beyond its
stop.
Do not loosen the stop ring. If the stop ring is loosened,
it is dan- gerous since the spindle will hop out.
An excess or a shortage of refrigerant is the main
cause of trouble to the units. Charge the correct
refrigerant quantity according to the description of
label at the inside of service cover.
Check for refrigerant leakage in detail. If a large
refrigerant leakage occurs, it will cause diffi culty with
breathing or harmful gases would occur if a fi re was
being used in the room.
Evacuation and refrigerant charge
- Connect the gauge manifold using charging
hoses with a vacuum pump or a nitrogen cylinder to
the check joints of the liquid line and the gas line stop
valve.
- Check for any gas leakage at the fl are nut connection,
by using nitrogen gas to increase the pressure at
4.15 MPa for outdoor units inside of the fi eld-supplied
piping.
- Operate the vacuum pump for 1 to 2 hours until the
pres- sure decreases lower than a pressure of 756
mmHg in vacuum.
- For charging refrigerant, connect the gauge manifold
us- ing charging hoses with a refrigerant charging
cylinder to the check joint of the liquid line stop valve.
- Charge the proper quantity of refrigerant according
to the piping length (Calculate the quantity of the
refrigerant charge).
- Fully open the gas line stop valve, and slightly open
the liquid line stop valve.
- Charge refrigerant by opening the gauge manifold
valve.
- Charge the required refrigerant within the difference
range of ±0.5kg by operating the system in cooling.
- Fully open the liquid line stop valve after completing
refrig- erant charge.
- Continue cooling operation for more than 10 minutes
to circulate the refrigerant.
Gas line
Outdoor unit
Manifold
gauge
Example of Evacuation and Refrigerant Charge.
40 l Can BREEZE Operating and Maintenance Cooling Unit Instructions 8-14 kW www.canovate.com
Thermal insulation
Liquid line
of the piping connection with
Liquid stop valve
thermal insulation
Gas stop valve
Nitrogen tank
(For air Tight test
& Nitrogen blow
during brazing)
Vacuum cylinder
Insulate the liquid pipe for
prevention of the capacity
decrease according to the
ambient air conditions and
the dewing on the pipe sur-
face by the low pressure
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