Application 2283 – Heating and/or

Chilled Water Cooling, ASHRAE Cycle III

Application 2283 – Heating and/or

Chilled Water Cooling, ASHRAE Cycle III

In Application 2283, the Unit Vent Controller0 to 10V Output controls a unit ventilator equipped with a chilled water coil for cooling, and/or a heating coil, which may be hot water, steam or electric, for ASHRAE Cycle III. A face-bypass damper can be controlled, replacing both the modulating (0-10V) heating and cooling actuators. If a face-bypass damper is used, two -position valves on the coils may be controlled. Heating only and cooling only units can also be controlled with this application by overriding HEAT.COOL (Point 5).

Other features available in this application include morning warm-up/cool-down, night mode override, free cooling, and auxiliary radiation in heating mode.

NOTE: The use of a low temperature detection thermostat (LTDT) is strongly recommended for hot water and steam systems.

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.

Figure 9. Application 2283 Control Drawing.

Siemens Building Technologies, Inc.

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Siemens 125-1957 owner manual Application 2283 Control Drawing

125-1957 specifications

Siemens 125-1957, a notable creation of the German engineering giant Siemens, is recognized for its innovative design and advanced technology in the realm of electrical engineering. This model is emblematic of the mid-20th century's commitment to optimizing electrical machinery for industrial applications, contributing to enhanced productivity and efficiency.

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In summary, the Siemens 125-1957 represents a blend of robust design, advanced motor technology, and user-oriented features. With its energy-efficient performance and adaptability, it stands out as a key asset in industrial electrical engineering, demonstrating Siemens' commitment to innovation and quality in the manufacturing sector. This model continues to be relevant, supporting various industries in their pursuit of efficiency and reliability.