Next week in Nashville – Free Seminar – Reserve Your Seat!
Get ready Nashville for the much anticipated and most requested HVACR training experience.
Continue to monitor this website for information regarding registration for this seminar.
Members and guests got to check a fractional hp compressor for good/bad windings at the June 2017 Regular Monthly Meeting at the Middle TN Chapter. Jayson Goff, CMS was the seminar leader and had just returned from a winning battle over Stage 4 cancer. By the way, the compressor was deemed terminally ill by Larry Lynn, CMS and Doug Drake, CM, due to bad terminals. 😀
Routine maintenance of blower sheaves should include a close examination of the alignment of the motor and blower sheaves. Proper belt tension is also important to maintain the life of the sheaves. Groove gauges are often provided by belt and sheave suppliers to test the sheave walls for wear to determine the need for replacement.
Another important item to check is the RPM’s of the blower to determine if it is within the range that was established during commissioning by test and balance personnel or startup technicians. Once the sheaves get a measurable amount of wear, it becomes increasingly difficult to provide the proper air delivery of the blower due to lost RPM’s.
Dehumidification features are common on residential systems ever since the introduction of variable speed blower motors. The system is set up so that the blower can produce less CFM per ton when latent (humidity) load in the space is higher than the setpoint relative humidity. Slowing the blower increases moisture removal by reducing the sensible load on the evaporator coil and therefore dropping the coil temperature and surface dewpoint.
Special considerations must be taken when installing condensers in cooler climates. During the colder weather, a winterizing valve should be utilized to maintain head pressure. This valve is actuated by a pressure difference between its inlet and outlet. The figure shows a “Winterstat” brand. Other valves may be used such as a “Headmaster” valve. If system pump-down is a desired feature, the receiver must hold the normal refrigerant charge plus the condenser charge with the bypass valve operating ̶ that is, partially open or intermittently opening and closing.EXCERPT FROM “TOOLS, CONTROLS AND TROUBLESHOOTING“, available from the ONLINE STORE at RSES.ORG.
One of the U.S. Environmental Protection Agency’s many duties is to oversee programs that protect the stratospheric ozone layer. Section 608 and 609 of the Clean Air Act enforces activities that protect the ozone layer as they apply to refrigeration and air conditioning systems. READ MORE
Save time and take the test online! The 609 examination is an open book test that can be taken online for $20 with immediate results. Persons who pass the open book exam are awarded: a wallet ID card and a wall certificate.
Click here to download a copy of the free study guide.
Click here to take the exam now!
Troubleshooting and servicing refrigeration and air conditioning systems can be a challenging process for both the entry level and experienced HVACR technician.
Regardless of your experience, size of the equipment, or location, to troubleshoot the system it is essential that you have a solid understanding of the fundamentals of refrigeration – including the principles of superheat and subcooling. READ MORE HERE