Frequently Asked Questions Series 4000 Overheat Indicators Frequently Asked Questions Q. What is a Pump Overheat Indicator?
A. The Pump Overheat Indicator monitors the heat generated from the pump. It is activated when the sensor located on the pump reaches a temperature of 125 degrees Fahrenheit (+ or - 5 degrees varience) and turns off when the temperature drops below 125 degrees Fahrenheit (+ or - 5 degrees varience). The Pump Overheat Indicator has two (2) flashing lights that inform the operator there may be a problem.
Q. I know my pump is overheating, but the Pump Overheat Indicator light is not on.
A. Check the lights for proper operation by depressing the test switch. If the lights illuminate, check the wires to see if they are broken or frayed. Apply heat (at least 125 degrees F) to the sensor or run the pump at 250-300 psi with the outlet valve closed for approximately 5 to 10 minutes. After a few minutes the sensor will activate and the lights will illuminate.
Q. What does the "Push-To-Test" switch do?
A. The switch on the Pump Overheat Indicator is a test switch used to indicate if the lights (and alarm, if used) are functioning properly. When pressed, the Pump Overheat Indicator bypasses the sensor and applies 12 VDC to the lights. (NOTE: The lights will flash for as long as the switch is depressed.) This test lets the operator know the unit has 12 VDC and ground applied and that the lights are in working order.
Q. I pressed the test switch but nothing happens. What is the problem?
A. Check the bulb for proper operation. Check the wiring as follows:
Red Wire Connected to 12 VDC Black Wire Connected to chassis ground Dual Contuctor Black Wire Attached to the sensor Brown Wire Connected to the alarm (if applicable)
If the wires are attached properly, there may be a problem with the switch. Press the switch several times. If the switch comes on intermittantly or not at all, contact MC Products at 1-800-843-6465 for further instructions.
Q. The Pump Overheat Indicator comes supplied with a brown alarm wire. It is not necessary for my application. What should I do with this wire?
A. The wire comes attached to a blue barrel connector. It may be left on or capped off. NOTE: it is important not to attach this wire to 12 VDC power or chassis ground.
Q. My Pump Overheat Indicator is in a location where it is getting wet. How can I protect it?
A. We recommend that the unit be sealed to prevent erratic readings. To do this, first ensure that the unit is clean and dry inside. Apply a bead of silicone around the seams to seal it.
Q. How do I mount the sensor?
A. Select a flat area on the pump housing that will not be affected by external heat sources ie. exhaust pipes. With denatured alcohol, clean the area of all dirt, oil, etc. Apply the mixed epoxy to the sensor bracket and place the bracket to the housing. Hold the bracket in place for about 5 minutes.