Siemens 125-1957 Manuale d'uso - Pagina 30

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APOGEE Unit Vent Controller

Application 2287 – Heating and Cooling,

Nesbitt Cycle W

In Application 2287, the Unit Vent Controller⎯0-10V Output controls a unit ventilator

equipped with a heating coil, which may be hot water or steam, for Nesbitt Cycle W. Auxiliary

radiation coils are piped parallel to the heating coil and are not controlled separately by the

application. A chilled water coil or a DX cooling coil may be controlled. Heating only units can

also be controlled with this application by overriding HEAT.COOL (Point 5) to HEAT.

Other features available in this application include morning warm-up/cool-down, night mode

override and free cooling.

NOTE:

This application controls room temperature by directly modulating the coil control device(s)

and the outdoor air damper according to the schedule defined by Nesbitt Cycle W. The free-

cooling/economizer function is turned on and off by the field panel using FREE CLG (Point

23). The unit ventilator fan is also controlled in this application.

⎯

0 to 10 V Output Owner's Manual

The use of a low temperature detection thermostat (LTDT) is strongly

recommended for hot water and steam systems.

Figure 20. Application 2287 Control Drawing.

Siemens Building Technologies. Inc.