Fedders Split System Air Conditioner warranty Sub-Coolingcharging, Operation Instructions, Model

Model

SUB-COOLING CHARGING

Coils with TXVs should be charged 10-12 degrees (+ or – one degree) of sub-cooling. For proper sub-cooling readings, a standard high side gauge is required for pressure readings.

Use the chart below to determine the required sub-cooling value.

INSTRUCTIONS

1.Measure the outdoor air temperature. (T1)

2.Measure the liquid line pressure at the outdoor unit and determine condenser refrigerant temperature by the scale on the high side pressure gauge. (T2)

3.Measure the liquid line temperature on the liquid line at the outdoor unit. (T3)

4.Subtract T3 from T2. (T2 – T3) This is the subcooling value. Compare this value and the outdoor temperature (T1), to the charts below. If the value is below the line, add refrigerant. If the value is above the line, remove refrigerant charge.

NOTE: For the majority of installations no adjustment to the TXV setting is required. However, if the measured superheat at the evaporator is less than 4° or greater than 8° an adjustment is required. The adjustment stem is at the base of the valve under the flare nut. To increase superheat tighten the stem clockwise and to decrease superheat back-out the stem counter-clockwise. Use a 1/4” refrigeration service wrench for this function.

NOTE: When removing refrigerant, always use standard reclaim procedures.

SUB-COOLING CHART FOR UNITS WITH TXV

OPERATION INSTRUCTIONS

1.If the furnace and air conditioner are on separate thermostats, turn the furnace thermostat off during the cooling season to prevent simultaneous operation of the heating and cooling systems. Reverse the procedure during the heating season.

Adjust thermostat temperature and fan settings according to the thermostat manufacturer’s recommendations. It is not recommended to vary the temperature settings more than 5 degrees. Varying the temperature more than 5 degrees or turning the thermostat off for periods less than 12 hours can actually cost you more in energy consumption than keeping the temperature constant. Consider indoor plants and pets when varying the temperature from the normal comfort level.

2.IMPORTANT: Wait at least 3 minutes after turning the air conditioner off before trying to restart. If an attempt is made to start the compressor before the refrigerant pressures are equalized, the compressor motor may trip on its overload. An additional waiting period will be required before restarting.

MAINTENANCE INSTRUCTIONS

For continuing high performance and to minimize possible equipment failure, periodic maintenance must be performed on this equipment. Frequency of maintenance may vary depending upon geographic areas, such as costal applications.

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FINAL CHECKS FOR INSTALLER

1.Ensure that all wiring is routed away from tubing and sheet metal edges to prevent rub-through or wire pinching.

2.Ensure that all wiring and tubing is secure in unit before adding panels and covers.

3.Tighten service valve stem caps to 1/12 turn past finger tight.

4.Leave Owner’s Manual with owner. Explain system operation and periodic maintenance requirements outlined in manual.

WARNING

BE SURE THE UNIT DISCONNECT IS IN THE “OFF” POSITION AND THAT ALL ELECTRICAL POWER TO THE UNIT IS TURNED “OFF” BEFORE CLEANING THE SYSTEM.

1.Keep the condenser (outdoor coil) clean. Wash it down with a garden hose if necessary.

WARNING

SERIOUS PERSONAL INJURY OR DEATH MAY RESULT IF WATER SPRAY IS DIRECTED TOWARD LIVE ELECTRICAL CONNECTIONS OR POWER SOURCES.

2.Remove any loose grass, leaves, papers, etc., from the area around the condenser coil. These could reduce the air supply through the coil and reduce the amount of cooling.

3.Always install and keep system filters clean. Consult your licensed Contractor for filter replacement schedules and instructions.

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