Field Charging
Note: If operating superheat is more than 5°F above the chart value, add refrigerant. If below the chart value remove refrigerant. If below the limit line, remove refrigerant.
Example (Using the 12,000 Btuh cooling chart):
1.suction pressure is 65 psi. which equals
38° F on the R-22 Scale of the low- side gauge.
2.Suction line temperature taken at the unit is 70° F. 70° F minus 38° F equals 32° F superheat.
3.Outdoor temperature is 90° F, indoor temperature is 80° F.
4.Intersection of the
5.Add charge to obtain 12° F superheat.
Instructions:
1.Measure suction pressure and determine
2.Measure
3.Measure outdoor and indoor tempera- tures.
4.Determine from the table what the super- heat should be for the indoor and outdoor temperatures. (Example indicates 12° F superheat.)
5.Adjust charge if needed. Be sure unit is running at stabilized condition.
Note: For installation of the indoor unit and
STARTING THE UNIT
•Before starting the unit in cool weather, power the system 24 hours before at- tempting to start.
•Do a final system check using the super- heat/subcooling method. Record results on Test Unit Performance Data sheet
(next page).
-Cooling mode superheat is set with a proper sized piston and charge, using the field charging charts.
-HeatingmodesuperheatissetwithaTXVand should be 5
•Remove gauge set. Mount all access panels and make sure they are properly secured.
•Make final visual inspection and repair any deficiencies.
(Proceed to the sequence of operation
on the following pages)
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