What is a CSIR motor?

capacitor-start-induction-run (CSIR) motor. single-phase motor that uses only a start capacitor that is removed from the circuit after the motor has started. centrifugal switch. starting device that opens and closes its contacts based on the speed of the motor.

What is CSIR in HVAC?


CSIR-CSIO has developed UV disinfectant system for HVAC ducts which has wide applications for disinfecting mechanically ventilated indoor spaces with a view to prevent the spread of Covid-19 like viruses, fungi, mold, bacteria etc.

What is a PSC compressor?

A PSC or permanent split capacitor is a type of motor that is designed to do two things. It turns on and it turns off. … Because the motor operates at a constant speed, the use of energy is a constant and efficiency is lost.

What are hermetic motors used for?

Hermetic Split-Phase Induction motors are used in small condensing systems. They contain two different windings. One winding is for starting and the other is for running. This motor is chosen for systems that require low start-up torque due to low start-up loads.

What is CSIR circuit?

Capacitor Start Induction Run (CSIR) is a type of Single-phase induction motor in which a capacitor is connected in series to start windings to maximize starting torque, as the motor comes up to speed, the relay removes the start winding and the start capacitor from the circuit then runs on the run winding alone with …

How do you determine run and start on a compressor?

Can hermetic compressors be repaired?

In contrast, hermetic motors or compressors can’t be simply opened for required repairs. In fact, opening the unit can cause severe damage. The steel shielding, if compromised, must be replaced and the hermetic sealing process must be repeated.

What is hermetic and semi hermetic compressor?

In a hermetic compressor, both the motor and the compressor are located within a single outer welded steel shell. … Both “hermetic” and “semi-hermetic” refer to the airtight seals used to protect components. The goal is to isolate the main compressor and engine in a safe environment.

How many types of windings are there in a compressor?

These windings are categorized into three type’s namely simplex, duplex and triplex type winding.

What is the advantage of a hermetically sealed compressor in refrigerator?

Hermetic Compressor

This type of compressor eliminates the use of Crankshaft Seal, which is used to prevent leakage. This makes whole the compressor and motor as a single compact unit makes it easy to handle. Basically, hermetically sealed compressors are air tight and ensure no leakage of the working fluid to outside.

What is the effect of changing the discharge pressure of a Vcrs?

Effect of Discharge Pressure

It may be noted that the increase in discharge pressure: decreases the refrigerating effect from (h1 – h4) to (h1 – h4′) increases the work required for compression from (h2-h1) to (h2′ – h1)

How do you Megger a compressor?

Which winding is used in dc motor?

Generally, the armature winding in dc machine is wound by using two techniques and these are also known as types of an armature winding such as Lap Winding and Wave Winding.

What is lap and wave winding?

The lap winding can be defined as a coil which can be lap back toward the succeeding coil. The wave winding can be defined as the loop of the winding can form the signal shape. … The connection of the wave winding is, the armature coil end is connected to commutator sections at some distance apart.

What is mega ohm meter?

A megohmmeter is an electric meter that measures very high resistance values by sending a high voltage signal into the object being tested. Typically, however, this is the only function a megohmmeter performs.

What is the difference between Megger and multimeter?

A megohmmeter is a high resistance meter. Generally, a multimeter is a medium resistance meter. … Megger is generally used to measure two electrical equipment The insulation resistance between the ground is a basis for preliminary judgment of whether the equipment can be put into operation.

Can you Megger a scroll compressor?

Don’t run a high voltage megohmmeter or Hi-pot test on a scroll (As a general rule, don’t go over double the rated running volts). Don’t do any megohmmeter test with a scroll under vacuum.

What is Megger value?

The Megger insulation tester is a small, portable instrument that gives you a direct reading of insulation resistance in ohms or megohms. For good insulation, the resistance usually reads in the megohm range.

Is a Megger AC or DC?

Therefore, if we apply AC voltage during IR test then there will always be a flow of current through the capacitor and thus a leakage current to the ground. … This is the reason, an Insulation Tester or Megger have DC voltage generator.

How much is a Megger?

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1004-450 Megger 1004-450 Lead Set, CAT IV 600V, 15 m, for DLRO100 Series See Price In Cart $1,640.00

What is a good megger reading?

Anything reading between 2 megohms and 1000 megohms is usually considered a good reading, unless other problems have been noted. Anything less than 2 megohms indicates an insulation problem.

What is Hipot test?

The hipot test, derived from the term High Potential Test, is a direct application of a high voltage to a unit under test. The test voltage is usually much higher than the usual operating voltage in order to stress the dielectric properties of the device under test.

Why megger testing is done?

What is Megger Testing? Megger is an electrical instrument that is used for testing insulation resistance and machine windings to safeguard all electrical equipment from major damage.

What is infinity on a Megger?

If your megohmmeter is reading “OL” (over load) or “I” (infinity), these are commonly used readings on megohmmeters when the measurement exceeds the maximum indicated value of the tester.