c. DO NOT operate your control with defective or mal-

adjusted switch mechanism (refer to bulletin on switch

mechanisms furnished for service instructions).

d. Magnetrol controls may sometimes be exposed to excessive

heat or moisture. Under such conditions, insulation on

electrical wiring may become brittle, eventually breaking

or peeling away. The resulting bare wires can cause short

circuits. Check wiring carefully and replace at the first sign

of brittle insulation.

e. Vibration may sometimes cause terminal screws to work

loose. Check all terminal connections to make certain that

screws are tightened.

NOTE: As a matter of good practice, spare switches should be kept on

hand at all times.

3.1.3 Inspect entire unit periodically

Isolate control from vessel. Raise and lower liquid level to

check for switch contact and reset.

3.2

What to avoid

1. Never leave switch housing cover off the control longer than

necessary to make routine inspections.

2. Never place a jumper wire across terminals to “cut-out” the

control. If a “jumper” is necessary for test purposes, be cer-

tain it is removed before placing control into service.

3. Never attempt to make adjustments or replace switches

without reading instructions carefully. Certain adjustments

provided for in level controls should not be attempted in

the field. When in doubt, consult the factory or your local

representative.

4. Never use lubricants on pivots of switch mechanisms.

A sufficient amount of lubricant has been applied at the

factory to ensure a lifetime of service. Further oiling is

unnecessary and will only tend to attract dust and dirt

which can interfere with mechanism operation.

8

46-602 B40 Liquid Level Switches