Variable Speed Exhaust Fan and Motorized Air Inlet Shutter Control in Greenhouse

We are attempting to use Quantum 240 Volt Fan Control 55S as seen at http://www.hogslat.biz/Quantum_Fan_Control.asp to control Farmtek's
CF1770 240 Volt Variable Speed Exhaust Fan as seen at http://tinyurl.com/2dtjzlc and Farmtek's 120 Volt Motorized Air Inlet Shutter #104186 as seen at http://tinyurl.com/yzt2s9z .
We are using a relay to provide the needed 120 Volt power to the motorized air inlet shutter. The fan and shutter motor are basically working OK, but there seems to be two problems:
1) The 3 second kick start function will work if I switch the controller from OFF to AUTO on the controller, but it does not work in normal operation when the temperature rises above the setpoint and calls for the fan to turn on. The fan just turns on at a slow speed and then ramps up as the temp increases on a hot day.
2) There is considerable interference to radios when the fan is running. Not sure if this is related to the problem above.
Do relays used in this manner tend to cause problems in the operation of the variable speed fan? Is there a known specific type of relay to be used in this kind of situation?
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