INSTALLATION INSTRUCTIONS
H. EVACUATING LINE SET AND INDOOR COIL
The unit is shipped with a factory refrigerant charge. The liquid line and suction line service valves have been closed after final testing at the factory. Do not disturb these valves until the line set and indoor coil have been evacuated and leak checked, or the charge in the unit may be lost.
NOTE: Do not use any portion of the factory charge for purging or leak testing. The factory charge is for filling the system only after a complete evacuation and leak check has been performed.
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CAUTION
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product damage.
Never use the outdoor unit compressor as a vacu‐ um pump. Doing so may damage the compressor.
Line set and indoor coil should be evacuated using the recommended deep vacuum method of 500 microns. If deep vacuum equipment is not available, the alternate triple evacuation method may be used by following the specified procedure.
If vacuum must be interrupted during the evacuation procedure, always break vacuum with dry nitrogen.
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of pulling a vacuum to 500 microns and a vacuum gauge capable of accurately measuring this vacuum level. The deep vacuum method is the most positive way of assuring a system is free of air and water.
Watch the vacuum gauge as the system is pulling down. The response of the gauge is an indicator of the condition of the system (refer to Figure 9).
With no leaks in the system, allow the vacuum pump to run for 30 minutes minimum at the deep vacuum level.
Figure 9 | Deep Vacuum Gauge Response | |
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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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MICRONS 2000 |
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| VACUUM TIGHT | |
1500 |
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| TOO WET | ||
1000 |
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| TIGHT | ||
500 |
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| DRY SYSTEM | ||
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0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
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3-phase R-22 Split System Heat Pump
Triple Evacuation Method
The triple evacuation method should only be used when system does not contain any water in liquid form and vacuum pump is only capable of pulling down to 28 inches of mercury. Refer to Fig. 10 and proceed is as follows:
1.Pull system down to 28 inches of mercury and allow pump to continue operating for an additional 15 minutes.
2.Close manifold valves or valve at vacuum pump and shut off vacuum pump.
3.Connect a nitrogen cylinder and regulator to system and fill with nitrogen until system pressure is 2 psig.
4.Close nitrogen valve and allow system to stand for 1 hour. During this time, dry nitrogen will diffuse throughout the system absorbing moisture.
5.Repeat this procedure as indicated in Figure 10.
6.After the final evacuate sequence, confirm there are no leaks in the system. If a leak is found, repeat the entire process after repair is made.
Figure 10 | Triple Evacuation Sequence |
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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
I. OPENING SERVICE VALVES
Outdoor units are shipped with a refrigerant charge sealed in the unit. Opening the service valves releases this charge into the system.
NOTE: Open the Suction service valve first. If the Liquid service valve is opened first, oil from the compressor may be drawn into the indoor coil TXV, restricting refrigerant flow and affecting operation of the system.
Remove Suction service valve cap and insert a hex wrench into the valve stem. Hold the valve body steady with an
After the refrigerant charge has bled into the system, open the Liquid service valve.
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