TAILIEUCHUNG - Central Air Conditioner Units And Refrigeration_11

Tham khảo tài liệu 'central air conditioner units and refrigeration_11', kỹ thuật - công nghệ, hoá học - dầu khí phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http CHAPTER 7 Electronic Control Systems ELECTRONIC control is here to stay. It has been approximately 16 years since the control industry first showed how microvoltages electronically amplified could be used in controlling air-conditioning and equipment cooling systems. Despite an erroneous but perfectly human awe in the presence of a revolutionary form of power engineers designers and building owners began to apply this new type of control to their systems. The ordinary serviceman shunned electronic control because the thought that it was a piece of hardware too technical to repair. By 1955 over 5000 electronic control systems were in use and it had become evident that their adjustment and maintenance were not more difficult but actually simpler than those of the more traditional control systems--pneumatic and electric. 2. In this chapter you will study system components applications and the maintenance performed on electronic control systems. 35. Components 1. The components discussed in this section are the humidity sensing element thermostats and damper motor. The control panel will be discussed later in this chapter. It houses the bridge and amplifier circuits that we covered in Chapter 6. 2. Humidity Sensing Element. The sensing element should be located within the duct at a place where the air is thoroughly mixed and representative of average conditions. You must be careful not to locate the sensing element too close to sprays washers and heating or cooling coils. The location should be within 50 feet of the control panel. All wiring and mounting should be accomplished as specified by the manufacturer. 3. Thermostats. The thermostats you will study in this chapter are space outdoor and insertion. In addition we will also cover thermostat maintenance. 4. Space thermostat. The thermostat should be mounted where it will be exposed only to typical or average space temperature. You should avoid .

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