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Phason MTC-4C User Manual

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Phason
MTC-4C user manual
The Modulating Temperature Control (MTC-4C) allows you to automatically control ventilation
fans according to the ambient temperature.
When the temperature is at the temperature set point, the MTC-4C operates the fans at the idle
speed setting. When the temperature exceeds the set point, the MTC-4C increases the speed. When
the temperature increases 6°F above the set point, the MTC-4C increases the speed to maximum.
When the temperature drops below the set point, the MTC-4C shuts off the fans (in shut-off mode)
or operates the fans at the idle speed (idle mode).
The MTC-4C is ideal for poultry, livestock, greenhouse, or light-industrial buildings.
Electrical ratings
Input:
120/230 VAC, 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
Features
One variable speed output
Adjustable 40-90°F temperature set point
Fixed 6°F temperature differential
Automatic shut-off and idle modes
Fixed 2°F off set-back for shut-off mode
Adjustable idle speed for idle mode
One-foot temperature probe, extendable to 500 feet
Overload protection fuse
Rugged enclosure (corrosion resistant, water resistant, and fire retardant)
CSA approval
Two-year limited warranty
14740006
MTC-4C user manual
1

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Summary of Contents for Phason MTC-4C

  • Page 1 The Modulating Temperature Control (MTC-4C) allows you to automatically control ventilation fans according to the ambient temperature. When the temperature is at the temperature set point, the MTC-4C operates the fans at the idle speed setting. When the temperature exceeds the set point, the MTC-4C increases the speed. When the temperature increases 6°F above the set point, the MTC-4C increases the speed to maximum.
  • Page 2 Installing the MTC-4C The MTC-4C must be installed by a qualified electrician. Before installing or servicing the MTC-4C, switch OFF the power supply at the source. Install the MTC-4C and all equipment connected to it according to local electrical codes.

  • Page 3: Connecting The Temperature Probe

    Phason Installing the MTC-4C Wiring the MTC-4C 1. Before wiring the control, set the voltage switch to the correct line voltage used (120 or 230 VAC). 2. Before removing electrical knockouts, remove the cover to prevent damaging the control. 3. Use watertight strain reliefs or conduit connectors at all cable entry points.
  • Page 4 You can extend temperature probe cables to lengths of up to 500 feet. Follow the guidelines below and 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 5: Operation

    In automatic shut-off mode, when the temperature drops below the set point, the MTC-4C shuts off the fans. Idle mode In idle mode, when the temperature drops below the set point, the MTC-4C operates the fans at the idle speed. Using automatic shut-off mode 1.
  • Page 6 5. Fasten the cover to the enclosure and then switch on the power to the control. Cleaning the MTC-4C To clean the MTC-4C, wipe the surface with a damp cloth. Be careful when washing the room using a high-pressure washer. DO NOT spray the control using a high-pressure washer, this can damage the control and will void the warranty.

  • Page 7: Troubleshooting

    To ensure the motor is working, disconnect the line at terminal 1 and terminal 4, and then connect these lines together. The fan should run at full speed. Use a short probe (stock probe length) on the MTC-4C to ensure excessive electrical noise is not being induced onto the probe.
  • Page 8 100 percent free of defects. Even reliable products can experience occasional failures and the user should recognize this possibility. If Phason products are used in a life-support ventilation system where failure could result in loss or injury, the user should provide adequate back up ventilation, supplementary natural ventilation, or an independent failure-alarm system.