Staged Environment Controller for Fans and Heaters

Model: FC-1T-2VAC-3F

Staged Environment Controller for Fans and Heaters

Model: FC-1T-2VAC-3F
An economical five-stage control with heavy duty relays

The FC-1T-2VAC-3F automatically controls the temperature in a room by operating two variable speed fans and up to three fixed -stage fans or heaters.


The FC-1T-2VAC-3F comes with seven factory-configured operating programs you can easily reconfigure for your ideal situation.

Peace of mind

You can connect the FC-1T-2VAC-3F to an alarm siren or other external alarm system. Customizable alarm settings allow you to choose which alarm conditions you want to be notified about.


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SKU: FC-1T-2VAC-3F Category:
  • Two variable cooling stages for controlling fans
  • Three general-purpose relays (heat or cool)
  • One alarm relay (for external alarm siren or alarm system)
  • Automatic temperature-based control, range: -13 to 125°F (-25 to 51°C)
  • Manual override/test mode
  • Seven configurable operating programs
  • Customizable alarm settings
  • Minimum and maximum temperature logging
  • Three-second full-power-turn-on for minimizing fan ice-up
  • Ventilation disable option
  • Power-failure settings protection
  • Four-digit LED display and individual stage LEDs
  • On-board diagnostics and self tests
  • Overload protection fuses
  • Temperature sensor; 30 feet, extendable to 500 feet
  • NEMA 4X enclosure (Corrosion-resistant, water-resistant, and fire-retardant)
  • CSA approval
  • CE certification
  • Limited warranty
  • Incoming power
    120/230 VAC, 50/60 Hz
  • Variable stages
    10 A at 120/230 VAC, general-purpose (resistive)
    7 FLA at 120/230 VAC, PSC motor
    1/2 HP at 120 VAC, 1 HP at 230 VAC, PSC motor
  • Variable stage fuses
    15 A, 250 VAC ABC-type ceramic
  • Relay stages
    6 A at 120/230 VAC, general-purpose (resistive)
    1/3 HP at 120 VAC, 1/2 HP at 230 VAC
    360 W tungsten at 120 VAC
  • Relay fuses
    12 A, 250 VAC ABC-type ceramic
  • Alarm relay
    0.4 A at 125 VAC, 2.0 A at 30 VDC, resistive load
    0.2 A at 125 VAC, 1.0 A at 30 VDC, inductive load

Manual Override Box

The Manual Override Box increases the load handling capability of your control's relays and provides an external disconnect.

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Temperature Sensors

Additional temperature sensors allow you to use 4-zone temperature averaging. Probes are available several lengths and can be extended up to 500 feet using extension cable.

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Bottom Board Kit | FC-1T-2VAC-3F

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Display Kit | FC-1T-2VAC-3F

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Ten pack of 12 A fuses

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Ten pack of 15 A fuses

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Is this compatible with the SEC-HD control?

Yes. The FC-1T-2VAC-3F is a direct replacement of the SEC-HD. The display kit KDSP-1T-2VAC-3F will work with an SEC-HD control board.

Can it control variable heaters?

No, the two variable stages are for cooling only. The three relay stages can control either cooling or heating.

Does the control have a manual override?

Yes, there is a manual override in the settings that you can use to test individual stages or to test the operation at different temperatures.

Does it control have an empty room mode?

Yes, there is the option to have ventilation off and only heat stages active. This is most often used when a room is empty and only needs to be kept from freezing. It also has multiple programs that you can use for different seasons or scenarios.

How big is the control?

The enclosure is 9 x 7 x 3.75 inches (23 x 18 x 9.5 cm). The heatsink adds an additional 1.25 inches (3.5 cm) to the width.


How do I configure my stages for heating or cooling?

Stages 3, 4, and 5 can be configured for either heating or cooling. Do this through the Configuration menu. See the user manual for step-by-step instructions.


Why doesn’t my ventilation turn on?

You may have ventilation turned off. See Enabling and disabling ventilation in the user manual.

Why does my variable fan stop running and hum at 80 percent output?

You may need to change your fan curve. You can do this through the configuration menu. See Configuring variable stages, parameters 19 and 20 in the user manual.