Heating Element; Drain Pan Valve - Friedrich KCS08A10A Service Manual

Heating Element

WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation. Extreme care must be used, if it
becomes necessary to work on equipment with
power applied.
Failure to do so could result in serious injury or
death.
All heat pumps and electric heat models are equipped with a heating element with the exception of model KHS10A10. The
other "KES12A33, KES16A33, KHS12A33 " models are equipped with a 3.3 KW element. The "KEM18A34, KHM18A34" models
are equipped with a 4.0 KW element. The "KEL24A35, KEL36A35, KHL24A35" models are equipped with a 5.2 KW 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 heater element must be installed.
NOTE: Always replace the heating element 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 filter 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 or when it is cooled off.
HEATING ELEMENT (Heat Pump Models)
The heating element for the "KHS12A33, KHL24A35, KHM1834" model is energized by an outdoor thermistor via the electronic
control board. The outdoor defrost thermistor is adjusted at a predetermined temperature of approximately 30 degrees Fahr-
enheit and sensed for two consecutive minutes, to stop the compressor and turn on the heating element.
TESTING THE HEATING ELEMENT
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 14.5 ohms for the 3.3 KW heater, 11.9 ohms for the 4.0 KW heater and 9.15 ohms
for the 5.2 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 con-denser 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 con-denser fan blade to freeze in the accumulated water and prevent it from turning.
Bellows Assembly
Drain Pan Valve
Figure 709 Drain Pan Valve
62
COMPONENTS TESTING
Figure 708 (Heating Element)
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.
Heating Element
Example