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Phason MTC-4C 

user 

manual 

14740006  

 

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 

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Input: 

120/230 VAC, 60 Hz 

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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 

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Fuse: 

15 A, 250 VAC ABC-type ceramic 

 

 

Features 

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One variable speed output 

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Adjustable 40-90°F temperature set point 

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Fixed 6°F temperature differential 

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Automatic shut-off and idle modes 

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Fixed 2°F off set-back for shut-off mode 

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Adjustable idle speed for idle mode 

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One-foot temperature probe, extendable to 500 feet 

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Overload protection fuse 

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Rugged enclosure (corrosion resistant, water resistant, and fire retardant) 

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CSA approval 

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Two-year limited warranty 

 

Summary of Contents for MTC-4C

Page 1: ...ode 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 a...

Page 2: ...fore removing electrical knockouts remove the cover to prevent damaging the control Do not make additional holes in the enclosure this can damage the watertight seal or components and void the warrant...

Page 3: ...bles Do not run the sensor cable beside AC power cables or near electrical equipment When crossing other cables or power lines cross them at a 90 degree angle Service Panel Enclosure C F E B A D Probe...

Page 4: ...e extension cable to the temperature probe cable as shown on the next page If the unit operates erratically with the extended probe run the cable along a different path or shorten it C A A C E D F A S...

Page 5: ...on 3 Turn the Idle Speed knob to the minimum idle speed desired 4 Turn the Temperature knob to the desired temperature Using idle mode 1 Position the jumper as shown in section G on page 3 2 Turn the...

Page 6: ...or acetoxy cure These sealants release acetic acid while curing which can damage the control and will void the warranty 4 Check all wires to make sure they are properly connected and that they are in...

Page 7: ...current rating of the control The fan motor growls 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 spe...

Page 8: ...ovide proof of purchase upon request All transportation charges for products submitted for warranty must be paid by the purchaser Except to the extent prohibited by applicable law no other warranties...

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