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MTC-3C installation guide 

 

Phason 

 

2  

2009-06-15 

 

Mount the unit on a sheltered, vertical surface, with the electrical knockouts facing down. 

Use a screwdriver to tighten the screws in the enclosure. Do not use a drill or over tighten the screws; this 
can crack the enclosure and ruin the watertight seal. 

Use the electrical knockouts for bringing wires or cables into or out of the enclosure. Use watertight strain 
reliefs or conduit connectors at all cable-entry points. 

Before 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 
warranty. 

Only permanent split capacitor motors appropriate for variable speed control, or shaded pole 
motors, can be used on the variable stage.

 

 

120 VAC 

1.

 

Connect the white wire to both the neutral side of the line and the 
common lead going to the motor.  

2.

 

Connect the blue wire to the other side of the motor.  

3.

 

Connect the black wire to the line side of the power line coming into 
the control. 

4.

 

Ensure the red wire has a marrette or similar connector installed to 
insulate any bare wire. 

 

230 VAC  

1.

 

Connect the red wire to one side of the line and the common lead 
going to the motor. 

2.

 

Connect the blue wire to the other wire from the motor.   

3.

 

Connect the black wire to the line side of the power line coming into 
the control. 

4.

 

Ensure the white wire has a wire nut or similar connector installed to 
insulate any bare wire. 

 

Temperature probe  

Follow the guidelines below and connect the temperature probe as shown 
in the diagram. 

‹

 

Do not run the probe cable in the same conduit as AC power cables  

‹

 

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. 

You can extend probe cables up to 500 feet. For more information, 
contact your dealer or Phason. 

 

103413.01

Use liquid-tight connectors at the cable entry points and seal with 
an RTV silicone. 

120 

VAC

230 

VAC

Service 

Panel

Enclosure 

C C

Service 

Panel

B

A

Whi

te 

Red  Blue

 

Black 

Probe 

Insulate 
using a 
#31 wire 
nut or 
similar 
connector. 

B

A

Prob

e

Insulate 
using a 
#31 wire 
nut or 
similar 
connector.

Line 

Neutral 

Load 

Fan 

Fan 

Load 

Line 

Line 

A

Fuse: 15 A, 250 VAC ABC-type ceramic 

B

Important:

 A suitable switch must be installed between the control 

and the motor.  

Important:

 

Il est essentiel ou'un interrupteur convenable soit 

installé entre le contröle et le moteur. 

C

Caution:

For controlling shaded-pole, permanent-split-capacitor, or 

universal motors only. 

Caution: 

Destiné uniouement à bague de déphasage ou à 

condensateur permanent.

 

D

Connect all ground wires to the grounding terminal located near the 
cable entry points. 

E

Whi

te 

Red  Blue

 

Black 

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