Phason
MTC-3C installation guide
10340009
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MTC-3C installation guide
The Modulating Temperature Control (MTC-3C) allows you to automatically control ventilation fans according to the ambient
temperature.
When the temperature is at or below the temperature set point, the MTC-3C operates the fans at the idle speed setting. When
the temperature exceeds the temperature set point, the MTC-3C increases the speed. When the temperature increases 6°F
above the temperature set point, the MTC-3C increases the speed to maximum.
Features
One variable speed output
Adjustable 40-90°F temperature set point
6°F temperature differential
Automatic and manual modes
Adjustable idle speed for automatic 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
Electrical ratings
120/230 VAC, 60 Hz
10 A at 120/230 VAC, general-purpose (resistive)
8.5 A model also available
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 MTC-3C is designed for high current and is too strong for small motors. The MTC-3C might not operate
properly when running fan motors with a very inductive power factor and that draw less than 0.5 A. To test
for this problem, connect the control to the motor and adjust the control from minimum to maximum. If the
motor jerks or locks during any part of the range of operation, the current draw is too low.
Adding more motors in parallel to increase the current draw, or wiring and using the motor for 120 V
operation can solve the problem. If this is not a viable solution, an 8.5 A version (MTC-3C-8.5) is available
from your dealer.
Installing the MTC-3C
The MTC-3C must be installed by a qualified electrician.
Before installing or servicing the MTC-3C, switch OFF the power supply at the source.
Install the MTC-3C and all equipment connected to it according to local electrical codes.
