CSZ ZP 16, Installation, Operation & Maintenance Manual, Page: 54 / 88

OPERATION
Page 4-6
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 dehumidi fi ca tion is called for.
The compressors will run as long as de-humidi fi cation is called for before the time-out
period is expired. If de-humidi fi cation is not called for within the preset time-out period, the
compressors will shut off. The compressors will turn back on when de-humidi fi 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 and

down 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
D u r i n g h u m i d i t y
operation, the dry air
purge system must be
turned off.
NOTE