Honeywell L91A, B, D Proportioning Pressuretrol Controllers
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Overview:
L91 Proportioning Pressuretrol® Controllers are Series 90 Modulating Pressure Controllers that provide direct control of modulating motors or valves used on automatic burners or steam heating systems.
Features:
- Models available for pressure systems up to 300 psi (2068 kPa).
- May be used with steam, air, noncombustible gases, or other fluids noncorrosive to brass or phos-bronze (300 psi model) bellows.
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When used with steam boilers, a steam trap (siphon loop) is recommended.
- Wiper on controller potentiometer moves in response to pressure changes.
- L91D has two potentiometers for unison control of two motors.
- L91B,D models have adjustable proportioning (throttling) range to allow selection of desired pressure control range.
- Adjustments made with screws on case top.
- Large, easily-read scale plates in both U.S. customary (oz/sq. in., psi, or in. Hg) and metric (kPa, MPa, or mm Hg) units.
- Steel case with clear plastic cover to observe pressure
- settings and potentiometer action.
- Fitting with 1/4 -18 NPT threads allows rapid installation.
- Surface mount with screws through knockout holes in case back
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