T921A1191 | Honeywell Proportional Low Voltage Thermostat 24–30VDC, 56–84°F, 135Ω Potentiometer
Honeywell · Sensors & Instrumentation
Description The Honeywell T921A1191 is a proportional low-voltage thermostat designed for precise temperature control in heating and cooling systems that utilize valve motors, damper motors, and balancing relays. Technical Specifications Condition New/Never Used Surplus Brand Honeywell Category Controls & Indicators Subcategory Thermostat Part Number T921A1191 Product Type Proportional Low Voltage Thermostat Type Low Voltage Thermostat Application Valve Motors, Damper Motors, Balancing Relays (Heating/Cooling Systems) Voltage 24–30 VDC Control Output 135-ohm Potentiometer Scale Fahrenheit Temperature Range 56°F to 84°F (13°C to 28°C) Mounting Wall mount (Horizontal orientation) Dimensions 5.68 × 3.37 × 2.25 in (144 × 86 × 58 mm) Housing Color Gray Housing Material Thermoplastic Control Type Proportional (Manual Dial) Ambient Temperature Limits 32°F to 122°F (0°C to 50°C) Electrical Connections Terminal block or pigtail leads (depending on model) Application Environment Commercial/Industrial Indicator Type Analog scale (Fahrenheit) Enclosure Rating Indoor use only Power Requirement None (self-powered via control circuit) Weight 0.90 lb (0.41 kg) Information About T921A1191 The Honeywell T921A1191 is part of the T900 series of low-voltage proportional thermostats known for their high accuracy and compatibility with pneumatic and electric actuator control systems. It features a 135-ohm potentiometer element, translating temperature changes into proportional voltage or current signals for precise modulation of valve and damper motors. With a sleek gray housing and horizontal wall-mount design, the thermostat is ideal for installations in offices, hospitals, schools, and other commercial spaces requiring reliable, long-term environmental control. Key Features: Proportional Control Thermostat: Provides smooth, linear output signals for modulating devices, enabling stable room temperature without cycling. Low Voltage Operation: Designed for systems operating at 24–30 VDC—ideal for electric valve and damper motor applications. Wide Temperature Range: Adjustable setpoint from 56°F to 84°F (13°C to 28°C) for broad environmental compatibility. Precision Potentiometer Element: Equipped with a 135-ohm potentiometer for accurate proportional output signal response. Universal Compatibility: Works with valve motors, damper motors, and balancing relays in both heating and cooling configurations. Durable Housing: Constructed with a gray thermoplastic case, offering long service life in commercial settings. Horizontal Wall Mounting: Simple installation and aesthetic integration with standard electrical wall boxes. Smooth Manual Adjustment: Easy-to-use temperature dial with Fahrenheit markings for intuitive setpoint control. Stable and Reliable Operation: Mechanical components engineered for minimal wear and extended calibration stability. Compact Design: Low-profile housing suitable for both retrofit and new installations in modern HVAC systems. The T921A1191 offers dependable, energy-efficient proportional temperature regulation for precise indoor climate control in professional and industrial environments.
Brand: Honeywell · Category: Sensors & Instrumentation
Key features
- Proportional Control Thermostat: Provides smooth, linear output signals for modulating devices, enabling stable room temperature without cycling.
- Low Voltage Operation: Designed for systems operating at 24–30 VDC—ideal for electric valve and damper motor applications.
- Wide Temperature Range: Adjustable setpoint from 56°F to 84°F (13°C to 28°C) for broad environmental compatibility.
- Precision Potentiometer Element: Equipped with a 135-ohm potentiometer for accurate proportional output signal response.
- Universal Compatibility: Works with valve motors, damper motors, and balancing relays in both heating and cooling configurations.
- Durable Housing: Constructed with a gray thermoplastic case, offering long service life in commercial settings.
- Horizontal Wall Mounting: Simple installation and aesthetic integration with standard electrical wall boxes.
- Smooth Manual Adjustment: Easy-to-use temperature dial with Fahrenheit markings for intuitive setpoint control.
- Stable and Reliable Operation: Mechanical components engineered for minimal wear and extended calibration stability.
- Compact Design: Low-profile housing suitable for both retrofit and new installations in modern HVAC systems.
Specifications
| Manufacturer part number | T921A1191 |
|---|---|
| Condition | New/Never Used Surplus |
| Brand | Honeywell |
| Category | Controls & Indicators |
| Subcategory | Thermostat |
| Part Number | T921A1191 |
| Product Type | Proportional Low Voltage Thermostat |
| Type | Low Voltage Thermostat |
| Application | Valve Motors, Damper Motors, Balancing Relays (Heating/Cooling Systems) |
| Voltage | 24–30 VDC |
| Control Output | 135-ohm Potentiometer |
| Scale | Fahrenheit |
| Temperature Range | 56°F to 84°F (13°C to 28°C) |
| Mounting | Wall mount (Horizontal orientation) |
| Dimensions | 5.68 × 3.37 × 2.25 in (144 × 86 × 58 mm) |
| Housing Color | Gray |
| Housing Material | Thermoplastic |
| Control Type | Proportional (Manual Dial) |
| Ambient Temperature Limits | 32°F to 122°F (0°C to 50°C) |
| Electrical Connections | Terminal block or pigtail leads (depending on model) |
| Application Environment | Commercial/Industrial |
| Indicator Type | Analog scale (Fahrenheit) |
| Enclosure Rating | Indoor use only |
| Power Requirement | None (self-powered via control circuit) |
| Weight | 0.90 lb (0.41 kg) |
| Product type | Thermostat |
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