8
TTK-SVN001-EN
Evacuation and Refrigerant
Charge
Air Evacuation and
Charging
The outdoor unit is factory
charged. Unit name-plate charge is
the total required system charge
with 7.5 meters (25 feet) of
interconnecting lines. Since the
outdoor unit will not have to be
evacuated unless charge has been
completely lost, leave the suction
and liquid shut-off valves closed.
1. Upon completion of
installation, remove the
service pressure tap cap and
connect the gauge manifold
and the vacuum pump to the
charging port using the
service hoses (Figure 8).
2. Pump the indoor unit and the
connecting tubes until the
pressure in them lowers to
below 1.5 mmHg
(350 microns) of vacuum
(Figure 9).
3. Stop the vacuum pump and
close the gauge manifold
valve, observe the micron
gauge, if gauge pressure
rises above 2.1 mmHg
(500 microns) in one (1)
minute, then evacuation is
in-completed or system has a
leak.
• Attach appropriate hose from
manifold gauge to suction
and liquid line valves service
ports.
• Attached center hose of
manifold gauges to vacuum
pump.
Note:
Unnecessary switching of
hoses and complete evacuation of
all lines leading to sealed system
can be accomplished by placing a
“T” in manifold center hose and
connecting branch hose to cylinder
of R-22.
4. If vacuum gauge does not
rise above 500 microns in
one minute, the evacuation is
complete.
5. With vacuum pump and
micron gauge blanked off,
remove the valve caps and
fully open the liquid and
suction service valves with a
hexagon wrench (Figure 10).
(Torque: 70 to 90 kg
f
- cm).
6. Disconnect the service
hoses, replace service
pressure tap port caps and
valve stem caps. These caps
must be replaced to prevent
leaks. Replace valve stem
cap finger tight, then tighten
an additional 1/6 turn.
(Tightening torque: 70 to
90 kg
f
- cm).
Refrigerant
pipe (flare)
Service valve
Charging port
Valve cap
Outdoor
unit
Service hose
with valve core
Pressure tap cap
Figure 8
Vacuum pump
R-22
Electrical
connection
Liquid line
Suction line
Service hose
Liquid pressure
Suction pressure
Micron gauge
Figure 9
Layout
14/1/03, 10:16 AM
8
Black
