Honeywell RC840T-240/U Electromechanical Heating Relay with Built-in 24V-208/240V Transformer

Honeywell RC840T-240/U Electromechanical Heating Relay with Built-in 24V-208/240V Transformer

Professional HVAC Control with Integrated Transformer

The Honeywell RC840T-240/U electromechanical heating relay delivers reliable line voltage load control from low voltage thermostats with an integrated 24V-208/240V transformer. This professional-grade relay features epoxy-soundproofed construction for quiet operation, terminal board connections for easy installation, and compatibility with both 2-wire (R,W) and 3-wire (R,W,C) thermostat connections. Designed for direct replacement of any brand name relay, it provides immediate activation for improved temperature control and comfort.

Professional Features & Benefits

• Built-in 24V Transformer: Eliminates need for separate transformer installation, simplifying wiring and reducing installation time
• Low Current Consumption (40 mA/1.2 VA): Allows multiple relays to be controlled by a single thermostat for zone control applications
• Epoxy-Soundproofed Relay: Ensures quiet operation in residential and commercial environments
• Terminal Board Connections: Enables easy installation and secure wire termination up to 12 AWG
• High Electrical Ratings: Handles up to 1.5 HP @ 240 Vac and 13 A @ 208 Vac for demanding heating loads
• UL and CUL Approved: Meets North American safety standards for professional HVAC installations
• Universal Compatibility: Direct replacement for any brand name relay with 2-wire or 3-wire thermostat connections

Technical Specifications

• Application: Control a line voltage resistive load from a low voltage thermostat
• Approvals Canadian Underwriters Laboratories Inc : Approved
• Approvals Underwriters Laboratories Inc : Approved
• Comments: Compatible with 24 V thermostats with 2-wire connections (R, W) or 3-wire connections (R, W, C)
• Control Signal: 24V/40 mA/1.2 VA
• Dimensions In : 3-7/32 in. wide x 2-9/32 in. high x 1-13/32 in. deep
• Dimensions Mm : 82 mm wide x 68 mm high x 36 mm deep
• Electrical Ratings: Inductive Load-- 1.0 HP @ 208 Vac, 1.5 HP @ 240 Vac, At full load-- 13 A @ 208 Vac, 12 A @ 240 Vac,
• Frequency: 60 Hz
• Includes: Lock-nut
• Input Voltage: 208 Vac; 240 Vac
• Item Type: Product
• Operating Humidity Range Rh : 0 to 95% RH, non-condensing
• Shipping And Storage Temperature Range C : -40 C to 80 C
• Shipping And Storage Temperature Range F : -40 F to 175 F
• Switching: On/Off switching
• Temperature Ratings C : -20 C to 60 C
• Temperature Ratings F : -4 F to 140 F
• Terminal Wire Size: 12 AWG
• Transformer: 22 A @ 208/240 Vac
• Used With: TH140-28-01-B; TH135-01-B; TH114-A-024T; TH115-A-024T
• Weight G : 326 g
• Weight Oz : 11.5 oz

Installation & Operation

1. Mount the unit in a suitable location with appropriate clearance and access for connections and service.
2. Connect utility and load conductors following applicable guidelines and the manufacturer's instructions.
3. Wire generator or power input according to the provided voltage/phase specifications and compatible capacity.
4. Configure any available load management or control features as supported by the provided specifications.
5. Test automatic transfer or operational functionality and verify proper performance before placing into service.
6. Complete final inspection and follow ongoing maintenance practices appropriate to the product category.

Professional Applications

• Residential heating system control
• Commercial HVAC installations
• Multi-zone heating control systems
• Retrofit and replacement applications
• Electric baseboard and unit heater control
• Professional service and maintenance

Why Choose Honeywell Quality?

Honeywell heating relays deliver proven reliability with UL and CUL approvals for professional HVAC applications. The robust construction withstands operating temperatures from -4�F to 140�F and humidity up to 95% RH non-condensing, ensuring dependable performance in demanding environments. Backed by Honeywell's commitment to quality and compatible with leading thermostat models for versatile installation flexibility.