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52 RLC-SVD05A-EN

Compressor Capacity - RTAC

 WARNING

Live Electrical

Components!

During installation, testing, servicing and troubleshooting of this product, it may

be necessary to work with live electrical components. Have a qualified licensed

electrician or other individual who has been properly trained in handling live

electrical components perform these tasks. Failure to follow all electrical safety

precautions when exposed to live electrical components could result in death or

serious injury.

5 Allow the compressor to start and monitor the compressor currents with a

clamp-on type ammeter.

Load 1 Once the compressor has started, allow the Unload solenoid to remain

energized for approximately 45 seconds, then open the Unload toggle switch

to de-energize the valve. Verify that at least one condenser fan is on before

continuing with the checkout, as low differential refrigerant pressure will

preclude proper Slide Valve operation. Record the male piston pressure and

compressor currents.

2 Manually close and open the Load toggle switch to energize the Load

Solenoid in 4 to 5 short “pulses”. Each load pulse should be approximately

one second in duration, with approximately 10 seconds between pulses.

3 Monitor the male pressure behind the piston and the amp draw of the unit.

Both should gradually increase with each pulse of the load solenoid.

Note: All limits are still active. If the chiller enters into a condenser, current, or

evaporator limit. Continuously monitor the operating mode.

Unload 1 Manually close the Unload toggle switch to continuously energize the Unload

Solenoid valve.

2 The pressure behind the male piston and the RLA of the unit should gradually

decrease with each pulse sent to the unload solenoid.

Note: The pressure behind the piston should be approximately suction pressure

when the compressor is fully unloaded. The RLA will be dependent on the

application.

With the results from the above checkout procedure use Tab le 9 to determine the

possible causes of the loading problem.

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