District heating systems: Freely programmable large size application (Excel 800)
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This example solution example provides control of
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primary heat exchanger with return water valve and return water temperature limitation |
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primary supply and return water temperature sensors |
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safety thermostat for secondary loop |
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outside air temperature compensated control or room control |
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mixed heating circuit with mixing valve and actuator, pump, pump alarm, supply and return water temperature sensor and safety thermostat |
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secondary heat exchanger for domestic hot water, including mixing valve and actuator, pump, pump alarm, supply and return water temperature sensor |
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solar energy domestic hot water control with loading pump and sensor |
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domestic hot water loading pump control with selectable priority switching and pump alarm |
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two domestic hot water sensors |
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domestic hot water circulation pump |
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energy management functionalities like Optimum start/stop, maximum load demand management and many others |
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| In addition integration with Honeywell and 3rd party LonWorks(R) systems is possible. Excel 800 supports 512 NV's and is LONMARK compliant. |
| Physical I/O's can be Honeywell Excel 800 Panel I/O's, Excel 800 LON I/O's, Smart I/O's or 3rd party LonWorks(R) devices. |
| Depending on the need for LonWorks interoperability with 3rd party devices, Excel 800 can typically control 170 physical I/O's or more. |
Honeywell Excel 800 Panel I/O's offer the unique benefit of
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Plug and Play: electronic module can be exchanged without the need to switch off power supply, automatic software update, configuration and start-up |
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Fast and easy wiring due to connector bridges, push-in wiring terminals, cross connectors and auxiliary terminals |
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Honeywell Smart I/O's offer the unique benefit of
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230 Vac or 24Vac versions |
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various point mixes |
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fixed or removable terminals |
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