50/450#, OPEN-HI, M-BLK, NEMA3R, P70 Series MICRO-SETTM Pressure Control 50/450#, OPEN-HI, M-BLK, NE
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P70 Series MICRO-SETTM Pressure Controls for Refrigeration and Air Conditioning, 4-Wire, 2-Circuit Contact Block
P70 single and dual function pressure controls are used in commercial air conditioning and refrigeration applications. The load-carrying contacts provide direct control of A.C. motors within the control’s rating. (See cover label for the electrical rating.)
The controls can be used with R- 12, R-22, R-500, or R-502 refrigerants. Specific models for ammonia applications are also available. The MICRO-SET construction of low pressure controls and low side of dual models permits differentials to a minimum of 5 psi (34 kPa).
! WARNING: On ammonia applications, the ammonia P70 pressure control must be mounted separately from the electrical cabinet. All Series P70 controls are designed for use only as operating controls. Where an operating control failure would result in personal injury and/or loss of property, it is the responsibility of the installer to add devices (safety, limit controls) that protect against, or systems (alarm, supervisory systems) that warn of control failure.
These controls are available with either main contacts (LINE-M2) CLOSE high - OPEN low, or main contacts (LINE-M2) OPEN high - CLOSE low contact action. The controls have a four-wire, two-circuit contact block that operates from a pressure actuated bellows. The controls have a single“sight-set” calibrated scale which shows cutout setting and the differential. Adjustments can be made readily without removing the control cover.
Repairs and Replacement
Field repairs must not be made except for replacement of the cover or knob.
Replaces Part Numbers: P70JE-1