Copeland Reciprocating CS Compressors w/ Trevor
HVAC School - For Techs, By Techs
Bryan Orr
4.9 ā¢ 1K Ratings
šļø 28 October 2021
ā±ļø 57 minutes
šļø Recording | iTunes | RSS
š§¾ļø Download transcript
Summary
Trevor Matthews from Refrigeration MentorĀ comes on the podcast to talk about Copeland reciprocating CS compressors. He and Bryan cover Bulletin AE4-1433 (foundĀ HERE) 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
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Transcript
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| 0:00.0 | This episode of the HVAC School Podcast is brought to you by our brand partners. |
| 0:09.1 | Carrier and Carrier.com, Refrigeration Technologies and Refrigge Tech.com. The Pasterrellos, Mike and John, |
| 0:17.0 | run a great organization and they make some of the best chemicals out there for our trade. A new product that you're going to want to try out if you haven't tried it yet is |
| 0:25.8 | Nylog White. We've tested out Nylog White. It's designed for air, water, |
| 0:31.4 | glycol, and gas so you can use it on all of your threaded connections. |
| 0:35.6 | It replaces many of your existing pipe dopes. |
| 0:38.3 | It's a very smooth, it's a very clean applying product. |
| 0:42.0 | Comes in a nice clean white container |
| 0:44.6 | with a thread on brush cap. |
| 0:47.1 | So you can apply your thread sealant |
| 0:50.0 | on all of your threaded connections easily and smoothly that is |
| 0:53.6 | nylon white from refrigeration technologies. |
| 0:56.5 | Find out more by going to refrigerate.com. |
| 0:59.5 | Also need to thank Mitsubishi Electric. |
| 1:02.3 | Go to Mitsubishi Comfort.com to find out the full line of products. |
| 1:06.0 | We often will call them duckless products but frankly |
| 1:09.0 | Mitsubishi's making a lot of really great ducked-in mini splits nowadays |
| 1:12.0 | some of them low static, some of the medium |
| 1:14.4 | static, their product line is just enormous. They have a really great grouping of products that you can do many |
| 1:19.1 | different things and many different applications. If you haven't taken a look at Mitsubishi in quite a while |
| 1:24.1 | go to Mitsubiciccom and find out more. Haven and Haven I IQ.com makers of the Central Air |
| 1:31.3 | controller and the Central Air Monitor, |
... |
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