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EVACUATION OF THE REFRIGERATION TUBES AND INDOOR UNIT
After connecting the indoor and outdoor units, evacuate the air from the line set and the indoor unit as follows:
Leak Testing
1. Connect the charging hoses to the low side of the manifold and the
service port of the suction valve (See figure 19).
2. Connect the center hose of the manifold valve to a nitrogen source.
NOTE: The nitrogen gas cylinder is used in a vertical standing position.
3. Charge system with nitrogen to 150 PSI for 1 – 2 minutes and check
for leaks, using standard industry leak detection methods.
4. Remove the nitrogen by opening the manifold valves. Re-tighten
flare fitting.
5. Once a leak has been located, repair it and test again.
NOTE: To verify that the system has no leaks simply close the valve to the vacuum pump suction to isolate
the pump and hold the system under vacuum. See below.
Evacuation
1. Connect the center hose of the manifold valves to a
vacuum pump, and open fully the low and high pressure
sides of the manifold valves (See figure 20).
DO NOT OPEN SERVICE PORT VALVES
2. Turn on the vacuum pump. Evacuate system for
about 30 minutes and confirm that the vacuum reading
is 500 microns.
3. Close all manifold valves and turn off the vacuum
pump. Watch the micron gauge for about 30
minutes.
a.
If the micron gauge shows a reading above 500
microns then levels off after a few minutes and
remains fairly constant, that is an indication that
the system is leak free but still contains moisture and may require further evacuation.
b. If the reading remains at a constant 500 microns the system has been properly evacuated.
c. If the reading drops, there is a leak that must be found and repaired before continuing.
4. Remove the valve caps from all valves. Slowly open each liquid line fully using a hexagonal Allen wrench.
Use the same procedure on the suction valve.
5. Securely tighten the caps back onto liquid and suction the valves.
6. Check for gas leaks from all connections. Test with an electronic leak detector, or with soapy water and
check for bubbles. Be sure to wipe off the soap with a clean cloth after leakage test.
950-0192revA
Shut-off Valve
Service Port
Liquid Pipe
Gas Pipe
Vacuum Pump
Figure 20
- 14 -
Flare Nut
Nut
Valve Core
Fig. 19
Manifold
Valve
Valve
Cap
November 27, 2013
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