INSTALLATION INPUT WIRING
INPUTS |
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A1 | T |
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A2 | TEMP |
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A3 | SHUTDOWN |
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A4 |
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A5 | + |
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A6 | S |
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A7 | NETWORK |
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A8 |
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A9 | SYSTEM | Dry Contact |
| System Prove | |
A10 | PROVE | |
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WARNING: The SYSTEM PROVE input can not be used as a safety limit. All equipment must have its own certified limit and safety con- trols as required by local codes.
BOILER |
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ACTVE |
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INPUTS |
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B1 | STAGE | Dry Contact |
B2 | A | Active Signal |
B3 | STAGE |
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B4 | B |
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B5 | STAGE |
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B6 | C |
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B7 | STAGE |
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B8 | D |
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WARNING: The BOILER ACTIVE IN- PUTS can not be used as a safety limits. All equipment must have its own certified limit and safety con- trols as required by local codes.
•The System Prove feature is provided to check system component operation.
•A typical use of this feature is to check for flow before firing any boiler stages. When there is a call for heat, the System Output activates the system pump starter. When the pump establishes flow, a flow switch closes together the SYSTEM PROVE input. Only then can the Harmony activate boilers and modulate them as required to hold the temperature set point.
•If the SYSTEM PROVE input is open on a call, the Harmony will enable only the System Output. All Stage outputs will be off when the SYSTEM PROVE input is open.
•A factory installed jumper provides the System Prove signal. Do not remove the jumper unless it will be replaced by a System Prove signal.
•The System Prove signal must be a dry contact only. No voltage can be placed across the SYSTEM PROVE - A9, A10 terminals.
•Bring the two wires from the dry contact to the terminals marked SYSTEM PROVE - A9, A10.
IMPORTANT: Do not remove the factory installed System Prove jumper unless it is replaced by a System Prove signal. If the SYSTEM PROVE input is not closed, the Harmony will NOT activate stages.
WIRING THE BOILER ACTIVE INPUTS
•A closure across the BOILER ACTIVE terminals informs the Har- mony that a boiler is running normally. If the BOILER ACTIVE terminals open, the Harmony registers that the Stage has encoun- tered a safety limit and can not be restarted without a manual reset. The Harmony will not reactivate or modulate a Stage which is not Active.
•The Boiler Active signal is not a safety, but use of these inputs will significantly improve the Harmony's set point control performance in the event of a Stage encountering a safety limit.
•A pair of BOILER ACTIVE terminals is provided for each stage.
•The Boiler Active signal must be a dry contact closure from the boiler controlled by that Stage's output. For example, the Boiler Active signal wired into terminals STAGE A (Terminals B1 and B2) must come from the unit whose operating limits are connected to terminals OPERATING LIMIT OUTPUTS A (Terminals 5 and 6).
•The BOILER ACTIVE terminals are dry contacts only. No voltage can be placed across the them.
•Wire the Boiler Active signals to their respective STAGE terminals:
-STAGE A to Boiler Active Input terminals B1&B2
-STAGE B to Boiler Active Input terminals B3&B4
-STAGE C to Boiler Active Input terminals B5&B6
-STAGE D to Boiler Active Input terminals B7&B8
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