Air Evacuation - Giatsu GIA-MDI-12IX43R32 Manual De Instalación

Air Evacuation

Safety Precautions
CAUTION
Use a vacuum pump with a gauge reading
•
lower than -0.1MPa and an air discharge
capacity above 40L/min.
The outdoor unit does not need vacuuming.
•
DO NOT open the outdoor unit' s gas and
liquid stop valves.
Ensure that the Compound Meter reads
•
-0.1MPa or below after 2 hours. If after
three hours the gauge reading is still above
-0.1MPa, check if there is a gas leak or
water inside the pipe. If there is no leak,
perform another evacuation for 1 or 2 hours.
DO NOT use refrigerant gas to evacuate
•
the system.
Evacuation Instructions
Before using a manifold gauge and a vacuum
pump, read their operation manuals to make
sure you know how to use them properly.
Manifold Gauge
Compound gauge
-76cmHg
Low pressure valve
Charge hose
Low pressure valve
Fig. 8.1
1. Connect the manifold gauge's charge hose to
the service port on the outdoor unit's low
pressure valve.
2. Connect the manifold gauge's charge hose
from the to the vacuum pump.
3. Open the Low Pressure side of the manifold
gauge. Keep the High Pressure side closed.
 Page 30 
Pressure gauge
High pressure valve
Charge hose
Vacuum pump
4. Turn on the vacuum pump to evacuate the
system.
5. Run the vacuum for at least 15 minutes, or
until the Compound Meter reads -76cmHG
(-1x105Pa).
6. Close the manifold gauge's Low Pressure valve
and turn o the vacuum pump.
7. Wait for 5 minutes, then check that there has
been no change in system pressure.
NOTE: If there is no change in system
pressure, unscrew the cap from the packed
valve (high pressure valve). If there is a
change in system pressure, there may be a
gas leak.
8. Insert hexagonal wrench into the packed valve
(high pressure valve) and open the valve by
turning the wrench in a 1/4 counterclockwise
turn. Listen for gas to exit the system, then
close the valve after 5 seconds.
Valve body
Valve stem
Fig. 8.2
9. Watch the Pressure Gauge for one minute to
make sure that there is no change in pressure. It
should read slightly higher than the atmospheric
pressure.
10. Remove the charge hose from the service port.
11. Using hexagonal wrench, fully open both the
high pressure and low pressure valves.
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexagonal
wrench until it hits against the stopper. DO NOT
try to force the valve to open further.
12. Tighten valve caps by hand, then tighten it
using the proper tool.
8
Flare nut
Cap