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Vacuum Pump and Leak Inspection
After the installation of refrigerant lines to both the
outdoor and indoor units are completed, the flare
connections must be checked for leaks. Pressurize
through the service valve ports, the indoor unit and
field refrigerant lines with dry nitrogen to 350-400
psi. Use soap bubbles or other leak-checking
methods to see that all flares are leak-free! If not,
release pressure; then repair!
SYSTEM EVACUATION
NOTE: Since the oudoor unit has a refrigerant
charge, the gas and liquid line valves must
remain closed.
1. Upon completion of leak check, evacuate the
refrigerant lines and indoor coil before opening
the gas and liquid line valves.
2. Attach appropriate hoses from manifold gauge to
gas and liquid line pressure taps.
3. Attach center hose of manifold gauges to vacuum
pump.
4. Evacuate until the micron gauge reads no higher
than 350 microns.
5. Close off valve to vacuum pump and observe the
micron gauge. If gauge pressure rises above 500
microns in one (1) minute, then evacuation is
incomplete or system has a leak.
6. If vacuum gauge does not rise above 500
microns in one (1) minute, the evacuation should
be complete.
7. Blank off vacuum pump and micron gauge, close
valves on manifold gauge set.
NOTE: DO NOT VENT REFRIGERANT INTO THE
ATMOSPHERE.
8. The liquid line shut-off valve can now be opened.
Remove shut-off-valve cap. Fully insert hex
wrench into the stem and backout counterclock-
wise open.
Installation Outdoor Unit
Multimeter -76cmHg
Charging Hose
Low Pressure Valve
9. The gas valve can now be opened. Open the gas
valve by removing the shut-off valve cap and turning
the valve stem 1/4 turn counterclockwise using 1/4"
Open End or Adjustable wrench.
10.The gas valve is now open for refrigerant flow.
If refrigerant lines are longer than fifteen feet (8 m), it
will be necessary to adjust system refrigerant charge
upon completion of installation.
27
Refrigerant
Charge Mouth
Liquid Pipe
Liquid Valve
Manifold Valve
Lo Handle
Gauges must be R410A rated
Gas Pipe
Gas Valve
Screwdriver
Hexagon
Spanner
Figure 12
Manometer
Hi Handle
Charging Hose
Vacuum Pump
Figure 13
MS-SVX10A-EN
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