Pressure Controls & Switches

Pressure controls and switches support HVAC service, maintenance, and replacement work where equipment needs to respond to pressure changes, airflow, or door movement. This category includes pressure switches for condenser fan cycling, adjustable controls for steam and other compatible pressure systems, airflow-responsive sail switches, and a door-operated reed switch for air-curtain control.

Product Display:
Helpful Buying Guide

Choose pressure controls and switches for the control points that matter

Match the control type to the function in the system, then confirm the stated open and close points, connection style, mounting arrangement, electrical requirements, and available installation space. The products represented here cover pressure-based fan cycling, low-range steam and pressure control, airflow-responsive switching, and door sensing for air curtains.

Visual Guide

Popular examples in this category

Steam Pressure Controller with Additive SPSTSteam Pressure Controller with Additive SPSTWBB393898Sail Switch with 5-Inch-Wide SailSail Switch with 5-Inch-Wide SailWBB39389025 PSI Open / 50 PSI Closed Pressure Switch25 PSI Open / 50 PSI Closed Pressure SwitchWBB461430High-Pressure SPST Pressure Switch, 600 PSI Open / 475 PSI CloseHigh-Pressure SPST Pressure Switch, 600 PSI Open / 475 PSI CloseWBB461405
Use Cases

Support pressure, airflow, and door-operated control

Use pressure switches for condenser fan cycling and pressure-responsive circuits. Select main-scale or steam controls for compatible pressure systems, sail switches for airflow-responsive work, and the magnetic reed switch for air curtains at door openings.

How to Choose

Compare switching points and installation details

For pressure switches, compare the stated pressure at which the circuit opens and closes. Also verify whether SPST operation, a 1/4 in. SAE flare connection, pipe or surface mounting, 24V operation, or compact dimensions match the existing application.

Applications

Find the control style for the application

Represented applications include condenser fan cycling, steam pressure control, automatic limit protection, low-pressure control, airflow-responsive HVAC control, and automatic air-curtain activation when a door opens.

Additional Info

Review system-specific compatibility details

Some pressure switches use sealed stainless steel sensors and snap action. Selected models state 24, 120, or 240V compatibility, while the floor-mounted reed switch is for 24V air-curtain applications and requires a control panel.

0.5–9 PSISteam control range

The steam pressure controller supports control within this stated range.

1–8 PSIMain-scale range

The main-scale pressure control offers adjustment within this range.

15–600 PSIListed open settings

Pressure switches represented here open at settings from 15 PSI to 600 PSI.

5 in.Sail width

The airflow-responsive sail switch has a 5-inch-wide sail.

Comparison Guide

Compare the represented control types

Use this overview to identify the basic control category before confirming the full product-specific settings and installation details.

Control typeRepresentative useKey selection details
Pressure switchesCondenser fan cycling and pressure-responsive circuit controlCompare open and close settings, SPST action, and applicable 1/4 in. SAE flare connection.
Steam and main-scale controlsSteam systems and compatible pressure systemsCompare the 0.5–9 PSI or 1–8 PSI range, differential adjustment, and mounting method.
Sail and magnetic reed switchesAirflow-responsive HVAC control or door-operated air-curtain controlCompare sail width and dimensions for airflow work, or confirm 24V operation, floor mounting, and control-panel requirement for air curtains.
Planning Guide

Plan the right fit before choosing

Pressure switch selection

Start with the required open and close pressure points

Pressure switches in this category are identified by defined switching settings for pressure-responsive operation. Fan cycling options include 170 PSI open/250 PSI closed and 210 PSI open/275 PSI closed. Other switches include 15/35 PSI, 25/50 PSI, 25/65 PSI, 90/120 PSI, 450/250 PSI, and 600/475 PSI settings.

  • Confirm whether the listed open point occurs on pressure rise or pressure fall.
  • Match the stated close point to the required cycling operation.
  • Choose SPST models where a single-pole, single-throw arrangement is needed.
  • For applicable direct-mount models, verify the 1/4 in. SAE female flare fitting with valve core depressor.
Low-range pressure controls

Consider range, differential, and mounting for steam and compatible systems

The steam pressure controller provides control from 0.5 to 9 PSI. A main-scale pressure control has a 1 to 8 PSI range and is designed for steam, air, noncombustible gases, or fluids that do not corrode the pressure-sensing element. The main-scale control also provides automatic limit protection and adjustable differential.

  • Use the stated pressure range to compare low-range control options.
  • The main-scale control can be pipe-mounted through 1/4 in.-18 NPT internal threads or surface-mounted through the case base.
  • Adjustable differential is set using top-mounted case screws.
  • For space-conscious work, compare listed dimensions and weight where provided.
Airflow and air-curtain controls

Match non-pressure switching components to the installation

A sail switch with a 5-inch-wide sail supports airflow-responsive HVAC control work. For commercial facilities using air curtains at door openings, the floor-mounted magnetic reed switch detects door movement to turn the air curtain on when the door opens and off after it closes.

  • Confirm the 5-inch sail width when matching an airflow-responsive replacement.
  • Use the reed switch only for 24V air-curtain control applications.
  • The reed switch uses a floor-mounted design and requires a control panel.
  • Review available space against the listed compact dimensions of the sail switch.
FAQ

Common questions before buying

What pressure settings are available?

Represented pressure switches include settings such as 15/35 PSI, 25/50 PSI, 25/65 PSI, 90/120 PSI, 170/250 PSI, 210/275 PSI, 450/250 PSI, and 600/475 PSI.

Which products are used for condenser fan cycling?

Several pressure switches are identified for condenser fan cycling, including low-pressure, high-pressure, and fan cycling switch configurations.

How do the low-range controls differ?

The steam controller has a 0.5 to 9 PSI range, while the main-scale pressure control has a 1 to 8 PSI range, adjustable differential, and pipe- or surface-mounting options.

What is needed for the floor-mounted reed switch?

It is for 24V air-curtain control applications, mounts at floor level, and requires a control panel.

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