Siemens 125-1957 Gebruikershandleiding - Pagina 28

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APOGEE Unit Vent Controller

Application 2286 - Heating and DX Cooling, ASHRAE

Cycle III

In Application 2286, the Unit Vent Controller—0 - 10V Output controls a unit ventilator

equipped with a DX coil for cooling, and/or a heating coil, which may be hot water, steam, or

electric, for ASHRAE Cycle Ill. A face-bypass damper can be controlled, replacing the

modulating (0-10V) heating actuator, but will modulate only in heating mode. If a face-bypass

damper is used, two -position valves on the coils may be controlled. Cooling only units can

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

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

override, free-cooling, and auxiliary radiation in heating mode.

NOTE:

This application controls room temperature by directly modulating the coil control devices.

This application also controls an outdoor air damper according to the schedule as defined by

ASHRAE Cycle III, to maintain a given mixed air temperature setpoint. The free-

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

23). If free cooling is not available, the outdoor air damper will be kept at minimum position;

otherwise, the outdoor air damper will modulate to maintain the mixed air temperature

setpoint. 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 17. Application 2286 Control Drawing.

Siemens Building Technologies. Inc.