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Wiring and Setting
1. Make sure that the controller has a relay installed for Output #2.
Verify that parameters TC2, COOL, and db are indicated in the
Setup menu.
2. Wire your cooling load to the Output #2 terminals located on the
back of the controller.
3. In the Factory Preset menu, program the correct code for Heat/Cool
action. See Table of Output Type Codes.
4. In the System menu, program TC2, the cycle time for Output #2.
5. Autotune or manually tune the PID parameters of your controller.
Autotune will work for the heating PID parameters but not on the
cooling parameters. You must manually tune the cooling parameters.
6. With the heat side tuned, manually set the COOL parameter or
Proportional Band Coefficient for Cooling. If the cooling output is
less powerful than the heating output, the Cooling Proportional Band
must be narrower than the Heating Proportional Band; the COOL
parameter would be less than “1”. If the cooling output is more pow-
erful than the heating output, the Cooling Proportional Band must be
wider than the Heating Proportional Band; the COOL parameter
would be more than “1”. See the programming section for more
details.
7. Finally, you can add a Deadband/Overlap. The programmed Dead-
band/ Overlap parameter can be within -50% to +50% of the Heating
Proportional band. To establish a Deadband, parameter “db” is set
Summary of Contents for CN4321
Page 33: ...32 SYSTEM WIRING DIAGRAMS Example 1 Example 2...
Page 45: ...44 Deadband Overlap...
Page 48: ...47 Table of Input Type Codes...
Page 50: ...49...
Page 53: ...52 Table of Alarm Action Type Codes CN4321...
Page 54: ...53 Table of Alarm Action Type Codes CN4431...
Page 59: ...58 Table of Output Type Codes...
