This video stems from an HVAC School podcast episode where Trevor Matthews and Bryan discuss Copeland reciprocating CS compressors. Throughout this video, Trevor and Bryan refer to Bulletin AE4-1433 (which you can find at as they look at the operating envelopes for the CS compressor.

The CS compressors are hermetic reciprocating compressors that can work with some of the newer refrigerants. You will likely see these compressors in applications with smaller tonnages.

You’ll usually want to charge these compressors with liquid refrigerant. If you have more than 6 pounds of charge in the system, using an accumulator is recommended. Under those charge conditions, the system also needs a check valve between the receiver and the condenser.

Suction line pressure drop is one of the most important things to pay attention to in the system. Make sure the suction line is of an appropriate size, that filter-driers don’t have restrictions, and that accumulators aren’t clogged. Overall, many manufacturers recommend removing the duction driers to keep the pressure drop minimal.

The recommended runtime for these compressors is also very short, only 5 minutes. CS compressors should cycle no more than 12 times per hour, and the off-time between cycles should be a minimum of 10 seconds.

Before returning or replacing a compressor, make sure you check all of the electrical components, including the capacitor. If the compressor hums but has power, you could simply have a capacitor or potential relay issue.

Trevor and Bryan also discuss:
Return gas temperatures
Discharge line temperature
Compressor superheat and flooded conditions with refrigerant blends
Crankcase heaters
Pump-down recommendations to stop short cycling
Initial charge vs. recharge
Metering devices
Line sizing
Electrical shorts
Sticking relays
Single-phase vs. three-phase power
Megohm testing
Purging with and flowing nitrogen
Burnout cleanup procedures
Locking/tagging out equipment
Hard start kits, potential relays, and start capacitors

Check out our handy calculators HERE.

Check out information on the 2022 HVACR Training Symposium at

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14 thoughts on “Copeland Reciprocating CS Compressors w/ Trevor

  1. t lech says:

    A great day this video reminded me that I forgot something that I knew that I didn’t know that I forgot.
    When you get old and start suffering from Alzheimer’s you could learn something new every day even if you knew it yesterday lol 😂

  2. Flyby Airplane says:

    Hi ALL my old blue books from basics onward were stolen in a break in so NOTHING COPELAND EXISTS now, also it seems that I was involved in helping design the EMERSON compressor protector system eons ago through ‘CLEAR SEAS RESEARCH’ from THE NEWS’ HVAC/R PAPER. I asked for a checkout paper @THE LAST AHR IN NYC, but EMERSON HAS YET TO SEND IT So much for EMERSON,!🇺🇸🇺🇸🇺🇸🇺🇸

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