OPERATION
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WATLOW F4 CONTROLLER OUTPUTS
Control Outputs
Output IA: Heating output. Cycles chamber heaters to when heating is called for.
Output IB: Cooling output. Cycles refrigeration valves when cooling is called for.
The compressors will run as long as cooling is called for before the time-out period has expired.
If cooling is not called for within the preset time-out period, the compressors shut off. They
will turn back when cooling is called for.
Output 2A: Humidify output. Cycles boiler heater or atomizing nozzle of humidity system when
humidity is called for.
Output 2B: De-humidify output. Cycles refrigeration valves when dehumidifi ca tion is called for.
The compressors will run as long as de-humidifi cation is called for before the time-out
period is expired. If de-humidifi cation is not called for within the preset time-out period, the
compressors will shut off. The compressors will turn back on when de-humidifi cation is
called for.
Single Set-Point Operation - Humidity (Optional)
1. Turn the humidity system ON.
2. Use the arrow keys to navigate through the lower display and place the arrow
cursor on setpoint 2.
a. Use the
right arrow key to enter the setpoint fi eld.
b. Use the up anddown arrow keys to change the setpoint.
c. Use the left or right arrow keys to exit the setpoint fi eld.
3. When returning to temperature only operation, turn the humidity system off.
Failure to do this will result in the unit not reaching low temperatures.
4. Verify that the demineralizer cartridge is fresh. The color of the cartridge should
be dark.
Dry Air Purge
Units Only
During humidity
operation, the dry air
purge system must be
turned off.
NOTE
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