GA7T: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
3
Use refrigeration grade tubing. Service valves are closed from factory
and ready for brazing. After wrapping service valve 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
* Units are rated with 25 ft. (7.6 m) of lineset. See Product Data sheet for performance data
when using different size and length linesets.
Notes
:
1.Do not apply capillary tube or fixed orifice indoor coils to these units.
2.For Tubing Set lengths between 80 and 200 ft. (24.38 and 60.96 m) horizontal or 35 ft.
(10.7 m) vertical differential 250 ft. (76.2 m) Total Equivalent Length), refer to the
Residential Piping and Longline Guideline -Air Conditioners and Heat Pumps using
R-410A refrigerant.
Install Liquid-Line Filter Drier Indoor
Refer to
Fig. 3
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. (127 mm) liquid tube. Flow arrow
must point towards indoor coil.
4. Connect and braze liquid refrigerant tube to the filter drier.
A05178
Fig. 3 – Liquid Line Filter Drier
Evacuate Refrigerant Tubing and Indoor Coil
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 (see triple evacuation procedure in
service manual). 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. A tight
dry system will hold a vacuum of 1000 microns after approximately 7
minutes. See
Fig. 4
.
A95424
Fig. 4 – Deep Vacuum Graph
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 or wires. Pay close
attention to feeder tubes, making sure wire ties on feeder tubes are
secure and tight.
CAUTION
!
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 brazing.
CAUTION
!
BURN HAZARD
Failure to follow this Caution may result in personal injury.
Components will be HOT after brazing. Wear appropriate personal
protective equipment and allow to cool before handling parts and
equipment
Table 1 – Refrigerant Connections and Recommended Liquid and
Vaport Tube Diameters
UNIT SIZE
(SERIES)
LIQUID
RATED VAPOR*
Connection
& Max. Tube
Diameter
Connection
Diameter
Tube
Diameter
24
3/8
3/4
3/4
36
3/8
7/8
7/8
48
3/8
7/8
1-1/8
60
3/8
7/8
1-1/8
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or
improper operation.
1. Installation of filter drier in liquid line is required.
2. Filter drier must be wrapped in a heat-sinking material such as a
wet cloth while brazing.
CAUTION
!
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.
500
MINUTES
0
1
2
3
4
5
6
7
1000
1500
LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
2000
MICRONS
2500
3000
3500
4000
4500
5000