Installation guide

Install Liquid-Line Filter Drier Indoor Evacuate Refrigerant Tubing and Indoor Coil
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Installation of filter drier in liquid line is required.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Never use the system compressor as a vacuum pump.
Refer to Fig. 5 and install filter drier as follows:
1. Braze 5-in. liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to above 5-in. liquid tube. Flow arrow
must point towards indoor coil.
4. Connect and braze liquid refrigerant tube to the filter drier.
Refrigerant tubes and indoor coil should be evacuated
using the recommended deep vacuum method of 500
microns. The alternate triple evacuation method may be
used if the procedure outlined below is followed. Always
break a vacuum with dry nitrogen.
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. 6)
Fig. 5 - Liquid Line Filter Drier
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UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Filter drier must be wrapped in a heat-sinking material
such as a wet cloth while brazing.
LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
0 1 2 3 4 5 6 7
MINUTES
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Fig. 6 - Deep Vacuum Graph
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 vacuum and system does not contain any liquid
water. Refer to Fig. 7 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. 7. System
will then be free of any contaminants and water vapor.