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Block 2

Refrigeration System Mastery

PHASE

BLOCK

PART

Absorb

Articulate

Master

BLOCK 02

Components & Control Devices

This Block focuses on refrigeration system behavior, heat transfer, and system performance. Download the Block Syllabus to help guide your progress.

Absorb

RESOURCES:

AST580: Valves, Switches, Pumps & Metering Devices
- Unit 3: Air and Refrigerant Flow (Pages 37–46)
- NVC Dryer Heat Exchange Diagram (Page 139)

Dryers at a Glance PDF (TD Article 11717) (26 Pages)

Assigned Videos & TD Articles (Day 3–4 Content)
- Hot Gas Bypass Valves (6 Minutes): https://qrfy.io/r/iMVE2AFlA_
- HPCO and LPCO (4 Minutes): https://qrfy.io/r/BeMbq-MQeX

Tech Direct Articles
- Troubleshooting LPCO and HPCO on Cycling and Non-Cycling Dryers — Article 17294
- NVC Dryer Low Suction Pressure Alarm — Article 16563
- Hot Gas Bypass Valve Adjustment — Article 14693
- ENLD Description and Operation — Article 11266
- EDV Cleaning (1 Minute) — Tech Tube 7240
- Installation of Condensate Drains on 2-Stage Oil-Free Units — Article 13449
- PNLD Installation Instructions — Article 18619
- Dryer Model Nomenclature — Article 10133

Articulate

Components & Control Devices | Written Responses

Show how well you can process and apply the information you just learned. Responses should be thorough, thoughtful, and demonstrate a strong understanding of the topic at a deeper, more practical level. To submit your responses for Supervisor Review, press the Submit Response button after the final question.

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Identify the key components of a refrigeration system and explain the function of each.

1

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Explain in detail how a Thermostatic Expansion Valve (TXV) controls refrigerant flow.

2

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Explain how a capillary tube controls refrigerant flow. Why is the length of the tube important?

3

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Which types of metering devices are considered fixed metering devices? Are superheat readings relevant when evaluating these systems? Why or why not?

4

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Describe the role of High-Pressure Cutout (HPCO) and Low-Pressure Cutout (LPCO) switches. Are these present in every refrigerated dryer? Explain.

5

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If a glycol pump were to stop operating, what trip or alarm would you expect to see? Explain why.

6

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Describe the roles of the fan cycling switch and liquid line solenoid valve. Which types of refrigerated dryers utilize these components?

7

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Complete

To submit your responses for Supervisor Review,
press the Submit Response button.

Complete

Mastery

Master

Components & Control Devices

When you feel confident in this topic, click button to begin Mastery. This is where Real Work meets Real Thinking — your response should show clear understanding, technical judgment, and the ability to apply what you’ve learned in the field.

Complete Mastery

GET SUPPORT

Return to Phase 5

Block 2

Refrigeration System Mastery

BLOCK 02

Components & Control Devices

This Block focuses on refrigeration system behavior, heat transfer, and system performance. Download the Block Syllabus to help guide your progress.

Absorb

RESOURCES:

AST580: Valves, Switches, Pumps & Metering Devices

Unit 3: Air and Refrigerant Flow (Pages 37–46)

NVC Dryer Heat Exchange Diagram (Page 139)

​​

Articulate

Components & Control Devices | Written Responses

1

2

3

4

5

6

7

To submit your responses for Supervisor Review, press the Submit Response button.

Master

Components & Control Devices

When you feel confident in this topic, click button to begin Mastery. This is where Real Work meets Real Thinking — your response should show clear understanding, technical judgment, and the ability to apply what you’ve learned in the field.

To submit your responses for Supervisor Review,
press the Submit Response button.