INSTALLATION OUTPUT WIRING
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LINE | NEUTRAL | SYS | A | B | C |
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N.O. contacts to activate a pump, valve or other system component
WIRING THE SYSTEM OUTPUT
System Output Operation in Set Point Mode
•The SYS output relay will energize whenever there is a call for output and the Shutdown feature is not active.
•Until the SYSTEM PROVE input is shorted, no Stages will be activated. If a Prove is not required, the factory installed jumper should remain.
•The SYS will remain energized while any Stage is active.
•When the last Stage relay turns off, the SYS output can remain energized for the period of time set by the System
•A typical use of the SYS output is to activate a system pump starter. The pump can run whenever there is a call for heat. When heat is no longer required, the pump will stay active for a few more minutes to remove the residual heat from the boilers.
System Output Operation in Reset Mode
•The SYS output relay will energize whenever the outdoor tempera- ture is below the Outdoor Cutoff.
•The SYS will remain constantly energized while the outdoor tempera- ture is below the Outdoor Cutoff.
•When the outdoor temperature rises 2°F above the Outdoor Cutoff, the SYS output will remain energized for the period of time set by the System
Wiring the SYS Output
•The SYS output has one Normally Open (N.O.) relay contact.
•The N.O. contacts are dry contacts only. They do not source any voltage.
•Class 1 voltages must enter the enclosure through a different opening from any Class 2 voltage wiring.
•Each N.O. contact is capable of switching 6A resistive at 120VAC.
•Total output SYS and the OPERATING LIMIT OUTPUTS must not exceed 15A.
WIRING THE STAGE OUTPUTS
Installing the Output Relays
•Each output stage (A through D) which is to be used must have a relay installed in the socket.
The SYS relay is included with the Harmony.
•To install a relay, orient the pins and then press it gently into the appropriate socket.
•Any stage output which does not have a relay must have its Mode set to Off (see Stage Settings pg. 22).
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