- SYSTEM SETTINGS 1-
Lag Delay
>Standby Time
System RunOn
Value
Value
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STANDBY TIME Default - 10 min
•The Standby Time only applies to Stages in Standby Mode.
•A Standby Stage can only be activated after all the Stages in Auto Mode have run at 100% modulation for the full Standby Time.
•Standby Stages are used for backup up or extreme load conditions only. A Standby Stage can never be a Lead Stage
•The full Standby Time must always elapse regardless of what happens to system temperature. Therefore, shorter Standby Times will result in smoother set point operation in extreme conditions. Longer Standby Times will result in more loss of load, but may prevent a Standby Stage from firing if the other stages can eventu- ally meet the load, or if the load decreases.
SYSTEM SETTINGS
- SYSTEM SETTINGS 1-
Standby Time
>System RunOn
<More Settings>
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Value
ADJUST
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ADJUST
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ADJUST
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setting
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SYSTEM RUN-ON Default - 0 min
•The SYS output relay will energize whenever there is a call for output and the Shutdown feature is not active.
•The SYS will remain energized while any Stage is active. When the last Stage relay turns off, the SYS output will remain energized for the period of time set by the System
•If the System
•A common use of the SYS output is to control a system pump in a heating system. After the last Stage is turned off, it is often desirable to run the system pump for an additional period of time to transfer the residual heat from the boilers to the heating system.
SYSTEM SETTINGS 2
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- SYSTEM SETTINGS 1- Standby Time System RunOn
><More Settings>
- SYSTEM SETTINGS 2- >Setback
Rotate Time Last Stg Hold
Value
Value
ADJUST
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ADJUST
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SETBACK | Default - 0 |
•Setback is not available in the Reset, or
•The Setback feature can be used to provide the Harmony with a lower temperature Set Point when less load is required.
•The lower Set Point will appear on the main display indicating this condition.
•A typical use for Setback is to providea lower system temperature to a factory during the night or on the weekends when product is not being manufactured but heat is still required.
•The Setback will not be activated unless a signal is wired into the Harmony EMS terminals. See pg. 7 for wiring.
•The amount of Setback selected is subtracted from the Set Point when a Setback signal is received.
•For a example, if the Set Point is 180°F and the Setback is 20°F, then when the EMS SIGNAL and SHIELD terminals are closed, the Harmony will hold a Set Point of 160°F.
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