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PowerPoint ® Presentation Chapter 12 HVAC Controls Pneumatic Control Systems Air Compressor Stations Transmitters and Controllers Pneumatic Thermostats.

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Presentation on theme: "PowerPoint ® Presentation Chapter 12 HVAC Controls Pneumatic Control Systems Air Compressor Stations Transmitters and Controllers Pneumatic Thermostats."— Presentation transcript:

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2 PowerPoint ® Presentation Chapter 12 HVAC Controls Pneumatic Control Systems Air Compressor Stations Transmitters and Controllers Pneumatic Thermostats Auxiliary Components Switching Relays Controlled Devices Actuators

3 PowerPoint ® Presentation Chapter 12 HVAC Controls Pneumatic Control Systems Air Compressor Stations Transmitters and Controllers Pneumatic Thermostats Auxiliary Components Switching Relays Controlled Devices Actuators

4 Chapter 12–HVAC Controls Pneumatic controls must operate properly to control the environment.

5 Chapter 12–HVAC Controls Pneumatic control systems include an air compressor station, transmitters and controllers, additional components, and controlled devices.

6 Chapter 12–HVAC Controls An air compressor station includes the air compressor and auxiliary components such as the air drier, drains, filters, and pressure-regulating valve stations.

7 Chapter 12–HVAC Controls A bimetallic element is a sensing device that consists of two metals with different expansion and contraction rates that respond to temperature increase or decrease.

8 Chapter 12–HVAC Controls Limit thermostats cause a change in a controlled device whenever the set temperature or pressure is reached.

9 Chapter 12–HVAC Controls Pneumatic humidistats are used to sense and control the humidity in a building space or duct.

10 Chapter 12–HVAC Controls Pneumatic pressurestats are designed to sense and control the pressure inside a duct or building.

11 Chapter 12–HVAC Controls Receiver controllers are used for HVAC system control. A receiver controller accepts one or more input signals from pneumatic transmitters and produces an output signal based on the setup of the controller.

12 Chapter 12–HVAC Controls A single-input receiver controller is designed to be connected to only one transmitter and maintain only one temperature, pressure, or humidity setpoint.

13 Chapter 12–HVAC Controls A dual-input receiver controller is designed to take the change of one variable and reset the setpoint of the controller to match the changing condition.

14 Chapter 12–HVAC Controls Switching relays are used to change airflow from one circuit to another.

15 Chapter 12–HVAC Controls Minimum-position relays are used to provide fresh air ventilation and prevent outside air dampers from completely closing.

16 Chapter 12–HVAC Controls Pneumatic positioners ensure damper or valve actuators move to a given position.

17 Chapter 12–HVAC Controls Electric/pneumatic switches enable a pneumatic device such as a damper to respond to the operation of an electrical device such as a fan.

18 Chapter 12–HVAC Controls Pneumatic/electric switches allow the signal from an outside air transmitter to be used to energize and de- energize a hot water pump.

19 Chapter 12–HVAC Controls An actuator and linkage control damper regulate the temperature of a building space.

20 Chapter 12–HVAC Controls Actuators may be damper or valve actuators. Damper actuator components are usually enclosed in the actuator body. Valve actuator components are usually visible from the outside.

21 Chapter 12–HVAC Controls Direct-coupled actuators are clamped to the damper shaft.

22 Chapter 12–HVAC Controls Dampers are used to control the flow of air and include parallel, opposed, and round blade dampers.

23 Chapter 12–HVAC Controls Control valves control the flow of fluids in an HVAC system. Control valve components include the valve body, stem, disc, packing, and actuator.

24 Chapter 12–HVAC Controls Two-way valves have one inlet and one outlet.

25 Chapter 12–HVAC Controls Mixing valves and diverting valves have similar designs. Mixing valves have two inlets and one outlet. Diverting valves have one inlet and two outlets.


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