Whirlpool MAH3000 Input Modifications Defined, Pressure Switch Input, Temperature Sensor Input

INPUT MODIFICATIONS DEFINED

PRESSURE SWITCH INPUT

The pressure switch is a two level pressure switch. (Figure 4-2)The low level contacts provide a path for a 24 VDC sensing circuit, the high level contacts provide an electrical path for 110 VAC to the water valve relays on the board. Another sensor on the board monitors the high level circuit to determine when the high level is reached and the circuit is opened. Thus, shutting off the water valve relays.

During wash fill, the low level of the pressure switch is sensed with 24 VDC and provides an indication to the control board the water level has satisfied the low level. Once satisfied, the 24 VDC circuit is opened. The board then opens the water valve relays and shuts off the water valves.

During rinse fill, the high level provides an indication to the machine control as to whether the high water level has been reached. When the water level switch is satisfied, the pressure switch circuit is opened and power for the water valves is no longer passed through the machine control.

		Figure 2
TEMPERATURE SENSOR INPUT		DOOR LOCK SWITCH INPUT
A thermistor is located in the water valve		When input is present, this is indication
to monitor the blended incoming water		the washer door is locked. The machine
temperature. The machine control uses		controller will not command the spinner
this input signal to regulate the water		to tumble or spin when the door lock
temperature with the warm or cold wash		input is not present.
and warm rinse temperature selections
(See Water Valve Outputs).		If the door is opened during a cycle,
On the MAH7500 model, another		the control will pause the cycle on the
		MAH5500B.
thermistor is located on the heater
assembly. The machine control board
uses this input signal to maintain the
water temperature in the sump area of
the outer tub, by cycling the heater on/
off.			2-4
16010486 (16008373-05)		Section 2. Washer Controls Overview
Revised 02/01	©2001 Maytag Appliances Sales Company