Jun 30, 2022
HVAC 233W - Commercial Refrigeration IIICredits: 5
Examines and identify refrigeration units associated with supermarket applications and the food industry. Diagnoses multiplex systems and self-contained equipment for medium/low temperature applications such as piping and trouble shooting mechanical and electrical components.
Prerequisite(s): HVAC 122 and HVAC 225
Lecture Hours: 45 Lab Hours: 30
Meets MTA Requirement: None
Outcomes and Objectives
- Demonstrate knowledge of multiplex commercial refrigeration systems.
- Define different types of multiplex systems.
- Explain the applications for multiplex systems.
- Describe how compressors are connected on a rack system.
- Describe physical construction of a rack and associated piping.
- Explain the advantages of a multiplex system.
- Identify an even or uneven parallel compressor rack.
- Define a cascade and centrifugal system.
- Demonstrate knowledge of commercial refrigeration/multiplex controls.
- Explain and set oil controls on rack systems.
- Explain and adjust oil controls on a multiplex compressor system.
- Explain and adjust valves in the piping on a multiplex system.
- Explain and adjust compressor cycling controls.
- Explain and adjust condenser controls.
- Identify defrost types and their operations.
- Explain hot gas defrost cycle.
- Explain cycle off defrost cycle.
- Explain electric defrost cycle.
- Setup and troubleshoot defrost systems.
- Identify multiplex evaporator systems.
- Explain and setup evaporators on multi-coil cases.
- Set super heat adjustments on multi-coil cases.
- Explain and adjust EPR valves for multi-case system.
- Explain and adjust temperatures on multi-case systems.
- Diagnose and repair multiplex systems.
- Diagnose high side and low side problems on a multiplex system.
- Diagnose temperature problems on evaporators and condensers.
- Diagnose evaporator problems and defrost cycle problems.
- Diagnose mechanical problems with the compressor systems.
- Diagnose electrical controls and three-phase power problems.
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