COMPONENTS TESTING (Continued)
HEATING ELEMENT
All electric heat models are equipped with a heating element. The EQ08 has a 1.15 KW element.
Heating Element
The heating element contains a fuse link and a heater limit switch. The fuse link is in series with the power supply and will open and interrupt the power when the temperature reaches 199°F or a short circuit occurs in the heating element. Once the fuse link separates, a new fuse link must be installed.
NOTE: Always replace with the exact replacement. The heater element has a high limit control. This control is a bimetal thermostat mounted in the top of the heating element.
Should the fan motor fail or fi lter become clogged, the high limit control will open and interrupt power to the heater before reaching an unsafe temperature condition.
The control is designed to open at 110°F ±6°F. Test continuity below 110°F and for open above 110°F.
TESTING THE HEATING ELEMENT
WARNING
ELECTRIC SHOCK HAZARD
Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death.
Testing of the elements can be made with an ohmmeter across the terminals after the connecting wires have been removed. A cold resistance reading of approximately 10.11 ohms for the 1.15 KW heater should be registered.
DRAIN PAN VALVE
During the cooling mode of operation, condensate which collects in the drain pan is picked up by the condenser fan blade and sprayed onto the condenser coil. This assists in cooling the refrigerant plus evaporating the water.
During the heating mode of operation, it is necessary that water be removed to prevent it from freezing during cold outside temperatures. This could cause the condenser fan blade to freeze in the accumulated water and prevent it from turning.
To provide a means of draining this water, a bellows type drain valve is installed over a drain opening in the base pan.
This valve is temperature sensitive and will open when the outside temperature reaches 40°F. The valve will close gradually as the temperature rises above 40°F to fully close at 60°F.
Bellows Assembly
Drain Pan Valve
16
