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Phason VTC-1D User Manual

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Phason
VTC-1D user manual
The Variable Temperature Control (VTC-1D) automatically controls the temperature in a room by adjusting
the speed of variable speed fans.
When the temperature is at the temperature set point, the VTC-1D operates the fans at the idle speed setting.
When the temperature exceeds the set point, the VTC-1D increases the speed. When the temperature drops
below the set point, the VTC-1D shuts off the fans (in shut-off mode) or operates the fans at idle speed (idle
mode).
Features
One variable speed output
Automatic shut-off and idle modes
Adjustable off set-back for shut-off mode
Adjustable idle speed for idle mode
Adjustable temperature set point
Adjustable temperature differential
Three-second full-power-turn-on to minimize
fan ice-up
Two-digit LED display
Electrical ratings
Input:
115/230 VAC, 50/60 Hz
Variable stage: 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
Fuse:
15 A, 250 VAC ABC-type ceramic
The FLA (full load ampere) rating accounts for the increase in motor current draw
when the motor operates at less than full speed. Make sure the motor/equipment
connected to the variable stage does not draw more than 7 FLA.
11140010
Fahrenheit and Celsius display
Error code display for troubleshooting
Overload protection fuse
Six-foot temperature probe, extendable to 500
feet
Rugged enclosure (corrosion resistant, water
resistant, and fire retardant)
CSA approval
Two-year limited warranty
VTC-1D user manual
1

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Summary of Contents for Phason VTC-1D

  • Page 1 When the temperature is at the temperature set point, the VTC-1D operates the fans at the idle speed setting. When the temperature exceeds the set point, the VTC-1D increases the speed. When the temperature drops below the set point, the VTC-1D shuts off the fans (in shut-off mode) or operates the fans at idle speed (idle mode).
  • Page 2 Phason Installing the VTC-1D The VTC-1D must be installed by a qualified electrician. Before installing or servicing the VTC-1D, switch OFF the power supply at the source. Install the VTC-1D and all equipment connected to it according to local electrical codes.
  • Page 3 You can extend temperature probe cables to lengths of up to 500 feet. Follow the temperature probe guidelines and the guidelines below when extending cables. Use two-wire 18 AWG jacketed cable. Phason recommends Belden # 9408, Alpha # 5052, or an equivalent. Extension cable is also available from Phason. For more information, contact your dealer or Phason.

  • Page 4: Getting Started

    Slide the heat shrink tubing over the solder joints. Shrink the tubing using a heat gun. Getting started When power is applied to the VTC-1D, the following displays: 88 displays for approximately 0.25 seconds (start-up). 00 displays for approximately 1 second (self-test).
  • Page 5 Internal jumper About hysteresis The VTC-1D has a 1°F (0.5°C) hysteresis. This means the fan will turn off 1°F below the temperature at which it turned on. For example, if temperature set point is 75°F, the fan turns on at 75°F, off at 74°F. This prevents the fan from flickering on and off when the temperature is at the set point.

  • Page 6: Setting The Temperature Set Point

    VTC-1D user manual Phason To set the mode of operation Press the switch to the right to start at the beginning of the parameter list. Press the switch to the left two times and then hold. For auto shut-off mode, the display flashes between oS and the setting. For idle mode, the display shows To set the control for auto shut-off mode, turn the trimmer to the desired off set-back using a small, flat screwdriver.
  • Page 7 Phason VTC-1D user manual The difference in motor power factors can cause the actual differential to be less than the displayed value. If the power factor of the motor is available, use the correction numbers and formula below to calculate the correct differential setting.
  • Page 8 VTC-1D user manual Phason Setting minimum ventilation in auto shut-off mode There must be a temperature probe connected before adjusting the minimum ventilation. To adjust the idle speed Idle Speed Turn the knob fully counter-clockwise and then 1/4 turn clockwise.

  • Page 9: Operation

    Phason VTC-1D user manual Operation Example 1: shut-off (OSB) mode Set point Differential Off set-back Idle speed 80°F 6°F 5°F The fan runs at full speed 86° Differential (6° above the Fan speed increases with an increase in temperature set point) temperature;...
  • Page 10 VTC-1D user manual Phason Example 2: idle mode Set point Differential Off set-back Idle speed 80°F 6°F The fan runs at full speed 86° Differential (6° above the Fan speed increases with an increase in temperature set point) temperature; decreases with a decrease in temperature 80°...
  • Page 11 VTC-1D user manual Maintaining the VTC-1D Proper care and maintenance will help your VTC-1D last longer. To prevent damage to the control, perform the following steps after the first two weeks of operation, and once a year after that. Switch off the power to the control.

  • Page 12: Limited Warranty

    Phason Limited warranty This warranty applies only to the Phason Inc. (Phason) Variable Temperature Control (VTC-1D). If you need warranty service, return the product and original proof of purchase to your dealer. Phason warrants the VTC-1D subject to the following terms and conditions.

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