SWEAT/ FLARE
ADAPTER
TEFLON
SEAL
PISTON 
PISTON BODY
LIQUID SERVICE VALVE
A97556
Fig.
DEEP VACUUM METHOD
The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns and a vacuum gage capable of accurately measuring this vacuum depth. The deep vacuum method is the most positive way of assuring a system is free of air and liquid water. (See Fig. 10.)
TRIPLE EVACUATION METHOD
The triple evacuation method should only be used when vacuum pump is only capable of pumping down to 28 in. of mercury and system does not contain any liquid water. Refer to Fig. 11 and proceed as follows:
1.Pump system down to 28 in. of mercury and allow pump to continue operating for an additional 15 minutes.
2.Close service valves and shut off vacuum pump.
3.Connect a nitrogen cylinder and regulator to system and open until system pressure is 2 psig.
4.Close service valve and allow system to stand for 1 hr. During this time, dry nitrogen will be able to diffuse throughout the system, absorbing moisture.
5.Repeat this procedure as indicated in Fig. 11. System will then contain minimal amounts of contaminants and water vapor.
LIQUID |
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SERVICE |
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VALVE | R | 0A |
A97555
Fig.
Tube
5000 |
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4500 |
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4000 |
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| LEAK IN | |
3500 |
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3000 |
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2500 |
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MICRONS2000 |
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1500 |
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| TOO WET | ||
1000 |
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| TIGHT | ||
500 |
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0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
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| A95424 | |
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Fig. 10—Deep Vacuum Graph
EVACUATE
BREAK VACUUM WITH DRY NITROGEN
WAIT
EVACUATE
BREAK VACUUM WITH DRY NITROGEN
WAIT
EVACUATE
CHECK FOR TIGHT, DRY SYSTEM (IF IT HOLDS DEEP VACUUM)
CHARGE SYSTEM
A95425
Fig. 11—Triple Evacuation Method
G. FINAL TUBING CHECK
IMPORTANT: Check to be certain factory tubing on both indoor and outdoor unit has not shifted during shipment. Ensure tubes are not rubbing against each other or any sheet metal. Pay close attention to feeder tubes, making sure wire ties on feeder tubes are secure and tight.
VIII. MAKE ELECTRICAL CONNECTIONS
WARNING: To avoid personal injury or death, do not supply power to unit with compressor terminal box cover removed.
Be sure field wiring complies with local and national fire, safety, and electrical codes, and voltage to system is within limits shown on unit rating plate. Contact local power company for correction of improper voltage. See unit rating plate for recommended circuit protection device.
NOTE: Operation of unit on improper line voltage constitutes abuse and could affect unit reliability. See unit rating plate. Do not install unit in system where voltage may fluctuate above or below permissible limits.
NOTE: Use copper wire only between disconnect switch and unit.
