30 Series Screw and Scroll Chiller Fundamentals
SER 270

Efficient operation of air- and water-cooled chiller systems requires a thorough understanding of their operation and service procedures. Many of these chillers use scroll or screw compression technology. In this class the service technician will learn how to best operate, maintain, troubleshoot, and service Carrier’s complete line of scroll and screw 30 Series air-cooled and water-cooled chillers from the past 20 years. Models covered include the 30GX/HX, RA/RB/RAP, and XA/XW. Studies include chiller refrigeration cycle, compressor theory, cooler heat transfer, and water- and air-cooled condensers. You’ll learn how to analyze performance by recording and analyzing refrigerant and water pressures and temperatures and calculating GPM flows. We also cover refrigerant controls, adjustments, charging, capacity control and capacity testing, and operation and troubleshooting of the electrical system, including timers, temperature controllers, and operating and safety controls. This class is mostly done in the classroom; however, several lab exercises are done using the control simulators, allowing students to have hands-on knowledge of chiller control operation. The skills learned in this class will allow operators to run machines more efficiently and service technicians to reduce service time and callbacks.

Who should attend this training

This course is for HVAC technicians with a minimum of one year of field experience or a graduate of an HVAC training program. Students are expected to have basic math skills and a basic understanding of HVAC tools (gages and digital thermometers) and troubleshooting equipment.

Learning Objectives

At the conclusion of this class each student should be able to:

• Identify the components of chiller systems by sight
• Use product literature to answer questions pertaining to design, installation, start-up, operation, maintenance, and parts
• Use the ComfortLink, PIC and Touch Pilot to enter system parameters
• Use the control system to check alarm status and alarm history and use the information to determine the appropriate troubleshooting
• Determine normal operation by comparing current operation to design conditions
• Determine proper water flow through the cooler and condenser heat exchangers based on chiller type and design
• Determine chiller capacity, troubleshoot and identify system problems using data from operating log sheets

Training Methods Used

This class uses a combination of classroom lecture, videos, animations, tours in the training facility lab, demonstrations, practical labs on operating equipment and workshops to present the material. Student’s achievement of the learning objectives is determined by successful completion of the workshops, labs, homework, and final written and practical exam. Workshops are instructor guided exercises using the procedures taught in the lectures.

Topics Covered

All times are approximate and shown as (classroom hours/lab or workshop hours).

• Basic troubleshooting and safety (2.0/0)
• 30GX, HX unit familiarization (2.0/0)
• 30GX, HX compressor familiarization (2.0/1.0)
• 30GX, HX cycle familiarization (2.0/0)
• 30GX, HX EXV familiarization (1.0/0)
• 30GX, HX economizer familiarization (2.0/0)
• 30GX, HX condenser and oil separator (1.0/0)
• 30GX, HX controls familiarization (2.0/0)
• 30GX, HX alarms and alerts familiarization (2.0/0)
• 30GX, HX new controls familiarization (2.0/0)
• 30GX, HX mechanical troubleshooting (2.0/2.0)
• 30GX, HX service tips (2.0/0)
• 30RA, RB and XA air-cooled chillers familiarization (2.0/0)
• Scroll compressor units (1.0/0)
• Screw compressor units (1.0/0)
• Starters (1.0/0)
• Condensers (1.0/0)
• Economizers (1.0/0)
• Metering devices (1.0/0)
• Coolers (1.0/1.0)
• Refrigerants (1.0/0)
• Hydronics (1.0/1.0)
• 30XA piping (1.0/0)
• 30XA controls (2.0/0)
• 30RB controls (2.0/0)
• 30XA control boards (1.0/0)
• Control interfaces (1.0/0)
• Waterside analysis and troubleshooting (0/2.0)
• Recommended maintenance (1.0/0)

Completion requirements

To receive a certificate for this class, student must be present for the entire class, complete all workshops and labs and receive a grade of 70% (C+) on graded labs, homework and final.

Prerequisite requirements

None.

Suggested background

For technicians just entering the HVAC field or persons with no field experience, this class is most effective when preceded by the BASIC Program (SER400), which introduces participants to fundamental concepts of both air conditioning and heating systems, including lab time with service test equipment and tools.

Materials to bring

No special equipment is required we provide the appropriate safety equipment required by Carrier. Arc flash equipment is not required for the voltages used in the lab, if you are required by your company to use other PPE you may bring that to class.

What you will receive

Students in this class receive a course workbook, Carrier Service Procedures handbook, safety gloves and goggles, charging calculators, and PT cards.

Appropriate dress for this class

This class has a number of exercises that take place in the lab on operating units; participants should wear long pants, closed toed shoes and appropriate shirt, long or short sleeve. If your employer requires special dress which is more stringent than these requirements, this dress should be worn.

Class hours

Days 1-3: 8:00am - 5:00pm. Day 4: 8:00am - 12:00pm. Travel arrangements should be made accordingly.

Location & lodging

Carrier University is located at 5900 Northwoods Business Parkway, Charlotte, NC 28269. Lodging options can be found here.