Johnson Controls P74HA-9C

DIFFERENTIAL PRES CONTROL; 4-WIRE CLOSE ON INCREASE IN DIFF PRESS 8/70# ADJ

DIFFERENTIAL PRES CONTROL; 4-WIRE CLOSE ON INCREASE IN DIFF PRESS 8/70# ADJ

The P74JA differential pressure control is commonly used on water systems to control a pressure differential between supply and return lines. The control’s SPDT floating action contacts position a motor actuated valve operated by a Johnson Controls M81 or Series M100A motor actuator. In atypical application the valve is located in a bypass line around the system pump. When the system pressure differential increases above the control’s set point, the valve opens further. More water is diverted through the bypass valve, resulting in a reduction in system pressure differential. A reduction in the pressure differential causes the valve to begin closing and results in an increase in system pressure differential. The P74JA is suitable for use on other air or liquid pressure differential applications where SPDT non-snap acting switching is desired.

Features

- Single-pole, double-throw, totally enclosed non-snap acting Pennswitch.

- ¼ in. flared tube pressure connection on the sensing element permits easy field installation.

- Direct reading scale for quick set point determination.

- Pressure differential setting can be easily changed without removing the cover.