Johnson P28 Series
Provides dependable protection against major breakdowns on pressure lubricated refrigeration compressors by guarding against low lube oil pressure. A built-in time delay switch, compensated for ambient temperature, allows for pressure pick up on start and avoids nuisance shut downs on pressure drops of short duration during the running cycle. The time delay assembly (timer and terminal board) may be easily removed and replaced in the field. Time delay switch is a ‘trip-free’ expansion rod device actuated by a resistance heater.
P28 Series (with mounting brackets)
Electrical Ratings-Pilot Duty
- Switch differential approx. 34 kPa
- Must be same voltage as pilot circuit
- Must be same voltage as time delay circuit
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