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For the HVACR technicians, here are the top troubleshooting HVAC books that help to the trainees and professionals to get their job done. Online shopping for Home Heating, Ventilation & Air Conditioning (HVAC) Books in the Books Store. This book includes everything you need to know about when to replace your current air conditioner and so much more!.
It goes over theory as well as troubleshooting techniques involved in heating and cooling repair. There is lots of information that helps anyone new to refrigeration understand the principles. Low Pressure Boilers The title sums this one up all by itself, if you need to work on low pressure boilers then this books for you.
It is very educational and practical with well written topics to help a student understand. Refrigeration and Ac Technology: Lab Manual While an older book this was once used by many trade schools to teach students.
While HVAC system do have new technology many old system are still use daily and need repair. It is big so not a quick read but very informative on most all HVAC topics.
Your email address will not be published. This site uses Akismet to reduce spam. Learn how your comment data is processed. There is also many pictures that show how electrical is working in a HVAC system. Step by Step passing the EPA certification exam Step by Step passing the EPA certification exam Need to pass the EPA exam to become a technician or are a home owner looking to save money on refrigerant by being able to download it yourself.
Low Pressure Boilers Low Pressure Boilers The title sums this one up all by itself, if you need to work on low pressure boilers then this books for you. Even though it is older and used a lot in the early s all the principles are the same.
Since it is older the price has dropped making it a good book to learn from while on a budget. But in window AC there is a provision for letting in fresh air. These are, as the name suggests, wall mounted.
Split units: 1 TR, 1. These are normally ceiling mounted. Packaged units are slightly bigger in size in capacity of cooling and in the range of 5 TR, 7. One difference in packaged units is that the evaporator with expansion valve and the compressor is in one unit and the condensor unit is outside. These are normally floor mounted. Common fault,blower status and heater status can also be monitored in case of Precision ACs Ce nttralliise d Systte m:: Ce n ra se d Sys e m This is for larger capacities of cooling requirements.
It uses a.
A Chiller to produce the cooling centrally b. Ahus Air Handling Units to provide cooling locally, by using the cooling energy produced at the Chiller. The Chiller and its components are usually referred to as the High side and the Ahus and the components are referred to as Low side of the HVAC contract. Chiilllle r:: Each chiller is controlled by a microprocessor-based control panel. Each chiller has its own Ch e r evaporator, compressors, condenser and expansion components.
In other words an expanded room air-conditioner, expanded multifold times. The water used in a chiller system is DM demineralized water.
The only difference is that the capacity of the compressor is much more. This Chilled water which is at a temperature of 5. Hence in a chiller system the refrigerant does not directly cool the warm area.
The above diagram shows 3 chillers. The primary pumps are used to pump the water into the chillers. Depending upon the amount of cooling required the compressors in each chiller is switched on or off.
The secondary pumps pump the cool water coming out of the chillers into the cooling coils of the various AHUs present in the building. There are basically 2 types chilled water distribution. In case of constant flow a constant amount of chilled water is sent from the chillers into the cooling coils of the AHU. Just remove the secondary pumps in the above sketch and you have a constant flow system.
In case of variable flow system, apart from the primary pumps which circulate constant flow through the chiller, secondary pumps are present which vary amount of water flowing into the cooling coils of the AHUs. The refrigerant in the chiller is either air-cooled or water-cooled. In case of water-cooled chillers the cooling tower is used to cool the water which cools the refrigerant. The cooling tower has fans. There is make-up water available to make up for any loss of water.
A measure of the load condition is the difference between the supply and return header temperatures. By measuring this difference, the load can be determined and energy saving means adopted, as will be illustrated below: If there is only one chiller, the microprocessor of the chiller will receive inputs of the supply and return header temperatures, apart from safety interlocks like water flow, refrigerant pressures etc and based on the difference, a decision on how many compressors can be switched on will be determined.
Example: Let us take the case of 2 chillers, each with its own microprocessor panel. This is because the microprocessor of chiller 1 will not know that there is another microprocessor panel of chiller 2 next to it.
Assuming no BMS or any other controls from Chiller manufacturer. Each chiller will switch off one compressor, as both the chillers have received same supply and return header temperature input.
Please Note: Whether BMS is there or not, the chiller manufacturer will use temperature sensors in supply and return line of the chiller as inputs to the microprocessor. Also, one chilled water pump can also be shut down. The same example can be extended to more number of chillers.
Please note: The decision to run the compressors of the chiller is taken by the micrprocessor panel of Chiller and not by BMS. BMS will only decide whether one or more chillers need to run. The operating of the compressors of the chiller, is referred to in HVAC industry, as loading and unloading of the chiller.
While switching off the chiller, The chiller is first switched off, then primary pumps and then the butterfly valve is closed.
When again switching on the chiller the reverse sequence is followed. This air then passes across a cooling coil inside which cold water is running from the chiller, through the pumps. Heat exchange occurs between the air and the chilled water in the cooling coil. The cooled air is then circulated into the supply air duct by means of a fan. Using ducts this cooled air is distributed to the various areas where this AHU is catering to.
A differential pressure switch connected across the filter is used to give a digital output when the filter is clogged. A differential pressure switch is used to monitor the functioning of the fan The AHU can also be operated on time schedule basis. For e. The AHU can be switched on from 9.
The return air temperature of each AHU is used to monitor the opening and closing of the valve connected at the outlet of the chilled water line cooling coils. If the return air temperature is high then the valve is opened wide.
If the return air temperature is low, then the valve is closed allowing only little water flow.