TEMPERATURE CONTROL BOARD
Model: PAV5000
The temperature control board receives information from the water temperature switch about the user’s water selections. The thermistor located in the water valve, provides inputs to the board, as it detects the incoming water temperature. This information combined with the selections on the temperature control switch determine the output signals to the water valve. The target cold temperature is 75° F, ± 5° F. The target warm temperature is 95° F, ± 5° F. The temperature control system is intended to warm wash fills when necessary to the target temperature. It will not cool a fill when the inlet temerature exceeds the minimum target temperature.
The analog board monitors the water temperature and will turn the valves ON and OFF to maintain proper water temperature. When the water temperature is set on WARM, both valves are on. The longer the valve is ON, the lower the water temperature will drop in the water lines. As the temperature drops the automatic tempera- ture control will cycle the water valve to maintain the proper water temperature. Rinse fills are not temperature controlled unless warm rinse is selected.
The analog automatic temperature control (ATC) table depicts the philosophy of how the automatic temperature control board operates. The thermistor temp represents the temperature sensed by the thermistor in the water valve. The outputs are indicative of the board sending voltage to the water valve solenoids.
Note: With the temperature control selector in the ON position.The only combinations where the temperature control board is active (BOLD) are warm and cold.
When cold is selected and the temperature sensed by the thermistor is too low at the valve, the hot valve will be activated.
When warm is selected and the temperature sensed by the thermistor is too cool, the cold valve will be shut off.
Analog Automatic Temperature Control (ATC) Table
Water Temp | ATC Selector | Thermistor | Hot Valve | Cold Valve |
Selections |
| Temp | Output | Output |
Hot | Off | Low | On | Off |
Warm | Off | Low | On | On |
Cold | Off | Low | Off | On |
Hot | Off | High | On | Off |
Warm | Off | High | On | On |
Cold | Off | High | Off | On |
Hot | On | Low | On | Off |
Warm | On | Low | On | Off |
Cold | On | Low | On | On |
Hot | On | High | On | Off |
Warm | On | High | On | On |
Cold | On | High | Off | On |
16023083
16008333 | SECTION 9. TROUBLESHOOTING |
© 1996 Maytag Corporation
