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14.3 Charging the Unit
STEP 1 - Attain Proper Gage Pressure.
Using the Standard R-454B Subcool Charging Chart,
adjust refrigerant level to attain proper gage pressure.
Note: Use bubble point, per the included chart, for
calculating subcooling.
Add refrigerant in the Liquid Gage Pressure is lower than
the chart value.
1. Connect gauges to refrigerant bottle and unit are
illustrated.
2. Purge all hoses.
3. Place refrigerant bottle on a scale and then open
bottle.
4. Stop adding refrigerant when liquid line refrigerant
and Liquid Gage Pressure match the charging chart.
Note: Recover refrigerant if the Liquid Gage Pressure is
higher than the chart value.
Note: Ensure that contamination of different refrigerants
does not ___ when using charging equipment.
Cylinders sahll be kept in an appropriate position
according to the instructions. Ensure that the
REFRIGERATING SYSTEM is earther prior to charging
the system with refrigerant.
STEP 2 - Stabilize the system.
1. Wait 20 minutes for the system condi-
tion to stabilize between adjustments.
Note: When the Liquid Line Temperature and
Gage Pressure approximately match the chart,
the system is properly charged.
2. Remove gages.
3. Replace service port caps to prevent
leaks. Tighten finger tight plus an ad-
ditional 1/6 turn.
STEP 3 - Record System Information for reference.
Record system pressures and temperatures after
charging is complete.
Outdoor model number = _________________
Measured Outdoor Ambient = __________ º F
Measured Indoor Ambient = __________ º F
Measured Liquid Line Temp = __________ º F
STEP 4 - Complete the 'Total System Charge' charge rating label below and label located on the outside of the
unit with a permanent marker.
a. Charge added at Factory = ___________ lb/oz
b. Charge added at install = ___________ lb/oz
c. Total System Charge (a + b) = ___________ lb/oz
16
20 MIN.
Measured Suction Line Temp = __________ º F
Liquid Gage Pressure = __________ PSI
Suction Gage Pressure = __________ PSI
88-A5AC4001-1A-EN
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