Installation guide

Figure 4 J Liquid Line Filter Drier
Refrigerant Tubing and Sweat Connections
Use refrigerant grade tubing. Service valves are closed from
factory and ready for brazing. After wrapping service valves
with a wet cloth, braze sweat connections using industry
accepted methods and materials. Consult local code
requirements. Refrigerant tubing and indoor coil are now
ready for leak testing. This check should include all field and
factory joints.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Service valves must be wrapped in a heat-sinking
material such as a wet cloth while brazinq.
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.
Evacuate Refrigerant Tubing and Indoor Coil
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.
Refrigerant tubes and indoor coil should be evacuated using
the recommended deep vacuum method of 500 microns. An
alternate triple evacuation method may be used.
IMPORTANT: 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.5)
Figure 5
Deep Vacuum Graph
IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
0 1 2 3 4 5 6 7
MINUTES
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
(711mm Hg). Refer to Fig. 6 and proceed is as follows:
1. Pull system down to 28 inches of mercury (711mm Hg)
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 6.
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 6 _ Triple Evacuation Sequence
IEVACUATEI
IBREAKVACUUMWiTHDRYNITROGENI
IEVACUATEI
IBREAKVACUUMW,THDRYNITROGEN]
IEVACUATEI
CHECK FOR TIGHT, DRY SYSTEM I
(IF IT HOLDS DEEP VACUUM
I
ICHARGESYSTEMI
428 01 1703 02 Specifications subject to change without notice. 5