FX-1 Operations Manual
Page 3Revision: 06 04 / 08 / 09
OVERVIEW
FX-1 is a user friendly, easy to operate, programmable temperature control.
PresstheON/OFF buttononce toengagethe system.The Displayindicatesroom temperaturewhen
the system is on and the Display is blank when the system is off.
Press and release the Select Button until the desired Mode LED is illuminated.
Set the desired room temperature by pressing the up or down button. The set point can be viewed
by momentarily pressing and releasing the Up or Down Button.
Fan speed operation is automatic allowing fan speed to decrease as room temperature is ap-
proached. The fan speed decreases as the set point is approached. The fan will operate at low speed
when set point is satisfied. Manual fan speeds can be selected by entering the program mode and
selecting the desired manual fan speed. The fan will operate at the speed selected and will not
change speeds with room temperature. See page 9 of this manual for programming instructions.
The fan can be programmed to cycle on and off with demand, allowing the fan to run only when
coolingorheatingisrequired.Normallytheautomaticfanspeedoperationisreversedintheheating
mode, however, the fan can be programmed to operate the same as in the cooling mode.
NORMAL HEATING OR COOLING CYCLE
SelectCoolonlyandcoolingonlywillbesupplied.Thecabintemperaturewillbemaintainedwithin
2°F of the setpoint. Select Heat onlyandonly heating willbesupplied. The cabintemperaturewill
be maintained within 2 ° F of the set point.
SelectAutomatic andboth heatingandcoolingwillbesuppliedasrequired.While inthe Automatic
Mode FX-1 will maintain a two degrees Fahrenheit (2 °F) temperature variation. A four degree
swing is required to cause the unit to shift to the opposite mode. Once in a given mode, heating or
cooling, FX-1 will maintain a two degree differential.
When the Heating or Cooling demand is satisfied, the compressor cycles off and the Automatic Fan
returns to low speed. The fan speed will remain constant if Manual Fan Speed has been pro-
grammed. REVERSING VALVE OPERATION
The reversing valve is toggled to the opposite mode when heating or cooling is required to reduce
the compressor starting surge. The valve will only toggle to the opposite mode when a cooling or
heatingcycle iscalled forandifthesystemhasbeen offfor lessthan seventy-five(75) seconds.The
valve will also toggle if a cycle is interrupted from the display panel by pressing the power button
ON/OFF,orchangingthesetpoint.Unnecessaryvalvetogglinghasbeenlimitedtoreducereversing
valve noise. Valve toggling can be totally eliminated by programming the minimum compressor
staging delay at seventy-five seconds (75) or greater.
Power on reset, which occurs when the system is powered up, will always initiate a valve toggle.
Memory: FX-1 has nonvolatile memory which requires no batteries or any form of backup power.
When power is lost the operating parameters are retained indefinitely. When power is restored, the
control resumes operating as last programmed. All operating and programming parameters are
entered into nonvolatile memory instantly and are retained indefinitely.
