Overview
The Honeywell C437 gas pressure switch is a proven pressure-actuated switching device engineered for industrial gas system applications requiring safety shutoff, pressure control, and differential-pressure monitoring. C437E gas pressure switches are pressure-actuated switching devices used in industrial gas system applications for safety shutoff, pressure control, and differential-pressure control. The Series 2000 models feature MicroSwitch snap switches to open or close a circuit on pressure rise or drop. Available in C437D and C437E variants, these switches accommodate diverse installation requirements and control logic needs.
Key Features
- C437 models have direct- and reverse-acting SPST (non-mercury) switching
- Increase strength of control diaphragm with Buna N fiber-reinforced material. Two Buna-N fiber-reinforced seal-off diaphragms for added reliability
- Clear glass cover allows observation of interior mechanism to aid in setting and checkout
- Impede tampering and provide dust-resistant operation with enclosed setting. Increase strength of control diaphragm with Buna N fiber-reinforced material
- Adjustable setpoint and differential for precise control
- Field-addable orifices available to compensate for momentary pressure surges
Technical Specifications
- Pressure Ranges: 1/2 to 5-1/2 in. of water (0.1 to 1.4 kPa); 1 to 26 in. of water (0.5 to 7 kPa); 1/2 to 5 psi (3 to 35 kPa); also 1–10 psi available
- Switch Type: Single-Pole Single-Throw (SPST), non-mercury
- Main or High Pressure: 1/2 in. NPT. Vent or Low Pressure: 1/8 in. NPT, female
- Reset Type: Manual reset (models with lockout function)
- Electrical Wiring: Hole tapped for 1/2 in. conduit
- Certifications: Underwriters Laboratories Inc. Listed: File No. MP2168, Guide No. MFHX. Canadian Standards Association Certified: File No. 1620, Guide No. 380-W-1.16
- Operating Temperature: Suitable for industrial HVAC and gas control applications
- Differential: Varies by model (typical range 1/2 psi to 1–3/4 psi)
- Installation: Surface mount or pipe mount with optional bracket
Typical Applications
- Gas furnace safety shutoff and interlock control
- Pressure monitoring in industrial boiler systems
- Differential-pressure control in air/gas handling equipment
- HVAC equipment pressure limit protection
- Gas burner management and pressure proving
Compatibility & Replacements
Compatible With
- Honeywell SV2 Series safety shut-off valves (with C6097 pressure switch companion)
- Industrial gas control systems requiring SPST switching logic
- Direct-action and reverse-action control circuits
- 24 VAC and line voltage (120/240 VAC) control systems
- Honeywell Home and Building Control Division HVAC equipment
Replaces / Drop-In Replacement For
- Earlier Honeywell mercury-based pressure switches (C437F, C437J, C437K variants)
- Older non-mercury C437 models in existing gas control installations
- Verify specific model compatibility with your system integrator or Honeywell documentation before ordering
Works With
- Honeywell Tradeline distributor parts and accessories
- Field-addable restrictive orifices (available from Honeywell for low-pressure surge compensation)
- Standard NPT pipe fittings and conduit (1/2 in. NPT main, 1/8 in. NPT vent)
- Industrial HVAC control logic and safeties
