52 PB
COMPONENTS TESTING
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.
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 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.
To test the drain pan valve;
1) Place a pack of ice on the capillary
2) Ensure that the valve opens as it cools down.
3) remove the pack of ice.
4) Ensure that the valve closes fully as the valve warms back up.
Bellows Assembly
Drain Pan Valve
Figure 709 Drain Pan Valve
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General