J52 Datasheet, PDF (4/8 Pages) Magnetrol International, Inc. – J52 Refrigerant Level Switches

PREVENTIVE MAINTENANCE
Periodic inspections are a necessary means to keep your Magnetrol control in good working
order. This control is, in reality, a safety device to protect the valuable equipment it serves.
Therefore, a systematic program of “Preventive Maintenance” should be implemented when
control is placed into service. If the following sections on “What To Do” and “What To Avoid”
are observed, your control will provide reliable protection of your capital equipment.
What To Do
1. Keep Control Clean
— Be sure the switch housing cover is always in place
on the control. This cover is designed to keep mois-
ture laden air and corrosive gases as well as dirt
away from the switch mechanism. In addition, it acts
as a safety feature by keeping bare wires and termi-
nals from being exposed. Be sure cover is tightened
all the way down to ensure compression of quad ring
seal. Should the housing cover become damaged or
misplaced, order a replacement immediately.
2. Inspect Switch Mechanisms, Terminals, and
Connections Monthly
— Switches should be inspected for excessive wear on
actuating lever or misalignment of adjustment screw
at point of contact between screw and lever. Such
wear can cause false switch actuating levels.
Do NOT operate your control with defective or maladjusted
switch mechanisms (refer to bulletin on switch mechanism
furnished for service instructions).
— Magnetrol controls may sometimes be exposed to
excessive heat or moisture. Under such conditions,
insulation on electrical wires may become brittle,
eventually breaking or peeling away. The resulting
“bare” wires can cause short circuits. Check wiring
carefully and replace at first sign or brittle insulation.
— Vibration may sometimes cause terminal screws to
work loose. Check all terminal connections to be
certain that screws are tight.
What To Avoid
1. NEVER leave switch housing cover off the control
longer than necessary to make routine inspections.
2. NEVER use lubrication 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.
3. NEVER place a jumper wire across terminals to “cut-
out” the control. If a “jumper” is necessary for test pur-
poses, be certain it is removed before placing control
into service.
4. NEVER attempt to make adjustments or replace switch-
es without reading instructions carefully. Certain adjust-
ments provided for in Magnetrol controls should not be
attempted in the field. When in doubt, consult the factory
or your local representative.
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