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Oil Pressure

  • Johnson P28 Series-1

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)

General

Cat.No. Part No. Time Delay Seconds Heater Circuit Volts Type of Reset Range kPa Refrigerant Pressure Connection
150006 P28AA-41 90 120/240 AC Manual 55 to 483 Non-Corrosive 900mm Cap. With 1/4 Fl. Nut
150004 P28AA-42 60 120/240 AC Manual 55 to 483 Non-Corrosive 900mm Cap. With 1/4 Fl. Nut
150051 P28AA-43 120 120/240 AC Manual 55 to 483 Non-Corrosive 900mm Cap. With 1/4 Fl. Nut
150055 P28AA-44 45 120/240 AC Manual 55 to 483 Non-Corrosive 900mm Cap. With 1/4 Fl. Nut
150008 P28AN-22 90 120/240 AC Manual 55 to 483 Ammonia 1/4 FNPT

Electrical Ratings-Pilot Duty

Cat.No. Part No. Timer Delay Heater Circuit Pilot Circuit Alarm Circuit (Optional) Contact Rating 2 to 1:2 to 3
150006 P28AA-41 240V.AC 750VA.120/240V.AC 125VA.120/240V.AC 10 Amps. 120V.AC 5 Amps. 240V.AC
150004 P28AA-42 240V.AC 750VA.120/240V.AC 125VA.120/240V.AC 10 Amps. 120V.AC 5 Amps. 240V.AC
150051 P28AA-43 240V.AC 750VA.120/240V.AC 125VA.120/240V.AC 10 Amps. 120V.AC 5 Amps. 240V.AC
150055 P28AA-44 240V.AC 750VA.120/240V.AC 125VA.120/240V.AC 10 Amps. 120V.AC 5 Amps. 240V.AC
150008 P28AN-22 240V.AC 750VA.120/240V.AC 125VA.120/240V.AC 10 Amps. 120V.AC 5 Amps. 240V.AC
  • Switch differential approx. 34 kPa
  • Must be same voltage as pilot circuit
  • Must be same voltage as time delay circuit

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