Phason
MSC-4 user manual
10440007
3
Setting the high/low limits
The factory settings for the low and high limits will adequately control most 230 VAC variable speed fans. You can adjust the
low and high limits to work best with your particular fan motor or incandescent lamps. See sections
E
and
F
of the drawing on
page 2 for locations.
The
low limit
sets the minimum speed of the fan, or intensity of the lamps, when the control knob is set to Low. The limit
can also be set so the fan or lamps are off when the control knob is at Low.
The
high limit
adjusts the control to work with motors of different power factors and sets the maximum speed of the fan, or
intensity of the lamps, when the control knob is at High.
Setting the limits for 120/230 VAC fans
1.
Turn the control knob on the cover to High and then adjust the HIGH LIMIT trimmer clockwise to increase fan speed,
counter-clockwise to reduce fan speed. If the fan begins to growl or rotate slowly during this step, slowly turn the trimmer
counter-clockwise until the fan is running smoothly. You may need to turn the trimmer fully counter-clockwise to regain
control of the fan.
2.
Turn the control knob to Low and then adjust the LOW LIMIT trimmer clockwise to increase fan speed, counter-
clockwise to reduce fan speed.
Setting the limits for 120 VAC lamps
1.
Turn the control knob on the cover to High and then adjust the HIGH LIMIT trimmer clockwise to increase lamp
intensity, counter-clockwise to lamp intensity.
2.
Turn the control knob to Low and then adjust the LOW LIMIT clockwise to increase lamp intensity, counter-clockwise to
reduce lamp intensity. Turn the trimmer fully counter-clockwise to turn the lamps off at this setting.
Maintaining the MSC-4
Proper care and maintenance will help your MSC-4 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.
1.
Switch off the power to the control.
2.
Remove the cover and check inside for moisture. If there is any moisture, wipe it away using a dry cloth.
3.
Check all cable entry points to make sure they are properly sealed. If they are not properly sealed, apply silicone sealant
around the entry points.
If you need to seal the enclosure, use a sealant that is labelled as ‘non-corrosive’, ‘electronics grade’, or
‘neutral cure’, such as GE Silicone RTV6780B, RTV 142, or RTV 162.
Do not
use a sealant that is labelled as ‘acetic acid cure’ 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 good condition.
5.
Fasten the cover to the enclosure and then switch on the power to the control.
