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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.
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THE MOTOR SAVER-PHASE MONITOR
Model 250A is an auto ranging voltage monitor designed to protect 3-phase
motors regardless of size. It is used on 190-480VAC, 50 to 60 Hz motors to
protect the motors from damage caused by single phasing, low voltage,
phase reversal, voltage unbalance, and also high voltage. Added features
include the DPDT contacts that are used to perform two functions when
parameters are exceeded in addition to the standard adjustable restart delay.
One of the ways to assure that a customer’s case is performing as it should is to test the airflow. One of the best ways to do this is with a test instrument that measures feet per minute as illustrated.
Be sure to measure the airflow at the case discharge air outlet as illustrated below:
The manufacturer recommends that the best time to measure the case airflow is during the warmest time during defrost as the case cycle is terminating.
Below is a manufacturers chart detailing an example of a case specifications including the case design average air flow. Without the proper air flow, the case temperature will not reach the desired set point and the product integrity will suffer.
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Sheave Maintenance
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.
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VIBRATION ELIMINATORS
Rigid connections at the compressor are prone to crack or break from vibration and stress. The cause may be discharge gas pulsation or compressor movement because of high torque.
There is a simple way to prevent line breakage from these causes. Install vibration eliminators in both the suction and discharge lines. They should be the same size as the lines. Install the vibration eliminators parallel with the drive shaft on the compressor. It should only be clamped on one end.
A typical vibration eliminator has rigid copper ends to connect to the compressor and the system. Between the ends is a length of flexible tubing. It is covered with woven brass or stainless steel mesh for strength.
EXCERPT FROM THE TECHNICAL INSTITUTE MANUALS AT THE ONLINE STORE OF RSES, THE HVACR TRAINING AUTHORITY.
FOR ALL YOU REFRIGERATION GUYS OUT THERE…..FIND OUT MORE HERE: https://goo.gl/EK8fSA
There is a lot going on in the world of Refrigeration. Electronics, alternative refrigerants and new ways to service equipment. One way to keep ahead of these changes and grow your business is to sign up for Refrigeration Contractor Weekly.
Awesome times at MeasureQUICK! What a difference a year makes. The integration of iManifold into MeausreQUICK breaths new life into a product that so many of you invested in. Thanks for your contin…
Source: iManifold integration into MessureQUICK – MeasureQUICK
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Training & Exams – Middle TN RSES
Press release via PRNewswire
Source: Hillphoenix Adds NXTCOLD® Low-Charge Ammonia System to Natural Refrigerants Portfolio