Siemens 125-1957 Owner's Manual - Page 16

Browse online or download pdf Owner's Manual for Controller Siemens 125-1957. Siemens 125-1957 48 pages. Apogee unit vent controller ⎯ 0 to 10v output

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Applications

Basic Operation

The Unit Vent Controller⎯0 to 10V Output provides Direct Digital Control (DDC) technology
for unit ventilator applications. The applications available in this controller are as follows:
•
Heating and/or Chilled Water Cooling,
ASHRAE Cycles l and II
•
Heating and/or Chilled Water Cooling,
ASHRAE Cycle III
•
Heating and DX Cooling,
ASHRAE Cycles I and II
•
Heating and DX Cooling,
ASHRAE Cycle III
•
Nesbitt Cycle W
•
Slave Mode (no control; available for set up,
and point extension device)

Control Temperature Setpoints

The controller maintains a specified temperature setpoint based on Day/Night mode, the
heating/cooling mode, or the setpoint dial (if used).

Day/Night Mode

The controller maintains the specified day setpoint temperature during daytime hours and the
specified night setpoint at night.
Day Heating Operation
The controller maintains the room temperature by resetting the unit ventilator's discharge
temperature setpoint (2281/2284), modulating the available coil control device, controlling
auxiliary radiation (if provided), positioning the outdoor air or face-bypass damper.
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Application 2281
Application 2283
Application 2284
Application 2286
Application 2287
Application 2299
Siemens Building Technologies,Inc.