START-UP Procedures Decal

4.Inspect the vent terminal, or vent system observing for any debris from weather, birds, and the like. Clean if necessary. Also check the combustion air inlet hood to make sure it is clear. See Figure 4.

WARNING

Leakage of products of combustion into the living area may result in asphyxiation resulting in injury or death

5.Restore the electrical power to the furnace by turning the switch back on. Adjust the thermostat to call for heating operation.

6.Observe the main burners flames. The main burners should be mostly “blue” with possibly a little orange (not yellow) at the tips of the flames. The flames should be in the center of the heat exchanger compartments and not impinging on the heat exchanger surfaces.

7.Observe the flames until the blower starts (there is a normal delay 30 second period until the heat exchanger warms up). There should be no change in the size or shape of the flame. If there is any wavering or blowing of the flame on the blower start-up, it is an indication of a possible leak in the heat exchanger. Turn off the gas valve in the gas line leading to the furnace, and then the main electrical switch to the furnace and call your service agency.

8.Replace the burner access door.

SECTION 7 • AIR CONDITIONING START UP PROCEDURE CRANKCASE HEATERS FOR NON-SCROLL COMPRESSOR UNITS

All models covered by this user guide utilize a compressor crankcase heater. It is secured on the exterior of the compressor at its base, and is controlled internally within the control panel to be energized anytime the compressor is off.

Some form of crankcase heat is essential to prevent liquid refrigerant from migrating to the compressor, causing oil pump out on compressor start-up and possible valve failure due to compressing a liquid.

The decal in Figure 5 is affixed to all outdoor units with crankcase heaters detailing start-up procedures. This is very important. Please read carefully.

FIGURE 5

IMPORTANT

These procedures must be followed at ini- tial start-up and at any time power has been removed for 12 hours or longer.

To prevent compressor damage which may result from the presence of liquid refrigerant in the compressor crankcase.

1.Make certain the room thermostat is in the “off” position (the compressor is not to operate).

2.Apply power by closing the system disconnect switch. This energizes the compressor heater which evaporates the liquid refrigerant in the crankcase.

3.Allow 4 hours or 60 minutes per pound of refrigerant in the system as noted on the unit rating plate, whichever is greater.

4.After properly elapsed time, the thermostat may be set to operate the compressor.

5.Except as required for safety while servicing—Do not open system disconnect switch.

7961-061

Manual	2100-502
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