6.6 VALVE, DRAIN PAN (see Figure 7)
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 due to
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 Figure 7: Drain pan valve
drain valve is installed over a drain opening in the Chassis.
This valve is temperature sensitive and will open when the outside temperature reaches 40°F
(4.4°C). The valve will close gradually as the temperature rises above 40°F (4.4°C) to fully
close at 68°F (20°C).
6.7 SEALED REFRIGERATION SYSTEM REPAIRS
EQUIPMENT REQUIRED:
1. Voltmeter
2. Ammeter
3. Ohmmeter
4. E.P.A. Approved Refrigerant Recovery System.
5. Vacuum Pump (capable of 200 microns or less vacuum.)
6. Acetylene Welder
7. Electronic Halogen Leak Detector (G.E. Type H-6 or equivalent.)
8. Accurate refrigerant charge measuring device such as:
a. Balance Scales - 1/2 oz. accuracy
b. Charging Board - 1/2 oz. accuracy
9. High Pressure Gauge - (0 - 400 lbs.)
10. Low Pressure Gauge - (30 - 150 lbs.)
11. Vacuum Gauge - (0 - 1000 microns)
EQUIPMENT MUST BE CAPABLE OF:
1. Recovery CFC's as low as 5%.
2. Evacuation from both the high side and low side of the system simultaneously.
3. Introducing refrigerant charge into high side of the system.
4. Accurately weighing the refrigerant charge actually introduced into the system.
5. Facilities for flowing nitrogen through refrigeration tubing during all brazing processes.
Service Manual
Room Air Conditioner with R-410A
Heat Controller, Inc.
13