Telco Envirotrols Inc.

Women's Business Enterprise National Council

 

Specializing in Environmental Equipment, Controls, and Parts

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P29 Series

Low Pressure Control (With Time Delay)

Description

P29NC is a low pressure control with time delay and lockout, which requires manual reset.  A drop in pressure energizes the time delay relay and opens a contact after 60 seconds, shutting down the equipment.  The time delay prevents nuisance shutdowns due to momentary fluctuations in system pressures.

Applications

  • chiller low temperature
  • industrial equipment, oil pressure lubrication
  • low suction pressure

Features

  • direct reading scale indication
  • dust-protected snap action switch
  • trip-free manual reset
  • replacement timing relays available

Accessories

  • universal mounting bracket (271-51)
  • replacement timing relays

Technical Specifications

  • pilot duty rating of 750 VA, 120/240 VAC
  • external step down transformer for 440 and 550 VAC applications must be sufficient capacity to supply 15 VA at 120 VAC or 30 VA at 240 VAC for time delay

Selection Chart

Code Number Switch Action Pressure Range Differential psig (kPa) Max Overpressure psig (kPa) Max Working Pressure psig (kPa) Pressure Connection Time Delay Setting
P29NC-2C SPST 20 in. HG Vacuum to 100 psi (-68 to 690 kPa) 2.2 ±1.5 (15.2 ± 10.3) 325 (2241) 250 (1723) 1/4 in. Male Flare Fitting 60 Seconds (Factory Set)
P29NC-3C 36 in. Copper Capillary Tube with 1/4 in. flare nut

Example: Setpoint @ 10 psig.  On a rise in pressure the timing circuit opens at 10 psig and time out ends.  On a fall in pressure the timing circuit energize at 6-9 psig and the time out begins.  If the pressure fails to reach 10 psig within the 60 second time delay, the main contacts open shutting down the controlled equipment.

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Last modified: 05/07/08