-
Home
/
-
2/26#SPDT 36DIF.PRESS.SWITCH
2/26#SPDT 36DIF.PRESS.SWITCH
P74EA-8 JOHNSON CONTROLS 2/26#SPDT 36DIF.PRESS.SWITCH
- Contact Form SPDT
- 208/240V
- Switch Action Open/Close on Rise and Fall
- Pressure Differential - Maximum 3.5 PSI
- Pressure 2 to 26 PSI
- Reset Type Automatic
- 1/4" Pressure Connection Size
- Pressure connection type FLARE
- Operating Temp Range 32 to 104 F
- 36" Capillary Tube Length
- Series P74
- Includes Universal Mounting Bracket
- Pressure Differential 3.5 psi
- 1/4" Flare Nut Connection
Features
- Field-proven Pennswitch with a completely enclosed contact mechanism
- Pressure differential setting is easily changed without removing the cover
- Heavy-duty, low-profile elements withstand unduly high overrun pressures that may be encountered in shipment or in some machine rooms.
- Lockout models have a "trip-free" manual reset.
- Long life contact structure with high contact force no contact bounce.
- Single unit mounting and wiring saves installation time and material.
- Conduit Opening: 7/8-inch Diameter hole for 1/2" Conduit
- Finish: Gray Baked
- Pressure Range PSIG: 2 to 26
Applications
- Differential pressure sensing on chillers or water-cooled condensers
- Lube oil failure cutout for refrigeration compressors (same as the P28, but does not incorporate time delay)
- Positioning M100 Series motor-actuated valves (P74JA-2)
- To prove pump operation
Series P74 measures the pressure difference between two sources: supply lines and return
lines. A change in differential pressure will reposition the switching mechanism to cause corrective action of the supplementary control equipment
These differential pressure controls are for use as operating controls and/or indicating system functions through display lights or panels. They measure the difference in pressure exerted upon its two sensing elements. The controls are available for applications sensing air, oil or liquid. Typical applications are proof of flow across a chiller or water cooled condenser, proof of flow in a heating or cooling coil and lube oil pressure sensing on refrigeration compressors. On a proof of flow application the control measures pressure drop across two different points in either a closed water circulating system or a city water to supply system.
On a proof of flow application in a water chiller system the control activates a light or signal to indicate a loss of water.The control may also be applied as a lube oil pressure sensing control on refrigeration compressors. They may be used in combination with P28 and/or P45 oil pressure cutout controls on two compressor, single motor units to reduce the oil system cost. Special low pressure models are available for variable speed and screw compressor oil pressure applications.
Single and double pole models are available with contacts that open on a pressure differential increase or close on a pressure differential increase. Also available are models with single-pole, double-throw enclosed contacts or with main and separate reverse-acting auxiliary contacts. Controls with lockout feature require manual reset to re-close circuit after lockout. The 'trip-free' reset will not permit restart until reset button is pushed and released. The operation point of the control is readily adjusted by rotating the adjusting disk. The control set points are easily read on a calibrated scale.
This product must be purchased in increments of 1
P74EA-8 JOHNSON CONTROLS 2/26#SPDT 36DIF.PRESS.SWITCH
- Contact Form SPDT
- 208/240V
- Switch Action Open/Close on Rise and Fall
- Pressure Differential - Maximum 3.5 PSI
- Pressure 2 to 26 PSI
- Reset Type Automatic
- 1/4" Pressure Connection Size
- Pressure connection type FLARE
- Operating Temp Range 32 to 104 F
- 36" Capillary Tube Length
- Series P74
- Includes Universal Mounting Bracket
- Pressure Differential 3.5 psi
- 1/4" Flare Nut Connection
Features
- Field-proven Pennswitch with a completely enclosed contact mechanism
- Pressure differential setting is easily changed without removing the cover
- Heavy-duty, low-profile elements withstand unduly high overrun pressures that may be encountered in shipment or in some machine rooms.
- Lockout models have a "trip-free" manual reset.
- Long life contact structure with high contact force no contact bounce.
- Single unit mounting and wiring saves installation time and material.
- Conduit Opening: 7/8-inch Diameter hole for 1/2" Conduit
- Finish: Gray Baked
- Pressure Range PSIG: 2 to 26
Applications
- Differential pressure sensing on chillers or water-cooled condensers
- Lube oil failure cutout for refrigeration compressors (same as the P28, but does not incorporate time delay)
- Positioning M100 Series motor-actuated valves (P74JA-2)
- To prove pump operation
Series P74 measures the pressure difference between two sources: supply lines and return
lines. A change in differential pressure will reposition the switching mechanism to cause corrective action of the supplementary control equipment
These differential pressure controls are for use as operating controls and/or indicating system functions through display lights or panels. They measure the difference in pressure exerted upon its two sensing elements. The controls are available for applications sensing air, oil or liquid. Typical applications are proof of flow across a chiller or water cooled condenser, proof of flow in a heating or cooling coil and lube oil pressure sensing on refrigeration compressors. On a proof of flow application the control measures pressure drop across two different points in either a closed water circulating system or a city water to supply system.
On a proof of flow application in a water chiller system the control activates a light or signal to indicate a loss of water.The control may also be applied as a lube oil pressure sensing control on refrigeration compressors. They may be used in combination with P28 and/or P45 oil pressure cutout controls on two compressor, single motor units to reduce the oil system cost. Special low pressure models are available for variable speed and screw compressor oil pressure applications.
Single and double pole models are available with contacts that open on a pressure differential increase or close on a pressure differential increase. Also available are models with single-pole, double-throw enclosed contacts or with main and separate reverse-acting auxiliary contacts. Controls with lockout feature require manual reset to re-close circuit after lockout. The 'trip-free' reset will not permit restart until reset button is pushed and released. The operation point of the control is readily adjusted by rotating the adjusting disk. The control set points are easily read on a calibrated scale.