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SER 120 at-a-glance

Technicians will learn how to best operate, maintain, troubleshoot, and service Carrier’s low and high-pressure 19D, DV, E, F, XL, XR and 19XRV centrifugal chillers.

  • Operate, maintain, troubleshoot, and service both the low- and high-pressure machines (including PIC controls)
  • Topics include centrifugal refrigeration cycles, compressor theory, lubrication cycles, purge operation, refrigerants, heat exchangers, and heat transfer
  • Students learn troubleshooting techniques needed to:
    • record and analyze machine temperatures and pressures
    • determine performance using heat exchanger approaches
    • waterside flow rate analysis
    • maintenance requirements using and logging machine data

duration cost format register
4 days $1,600 classroom


Class Overview

Centrifugal chillers represent a significant HVAC investment for the building owner, and each type of machine requires specific operating, servicing and maintenance practices to protect the investment. This course is intended for service technicians and operators of Carrier 19 series centrifugal chillers. The course covers fundamental principles of centrifugal chillers with in-depth coverage of the operation and service techniques associated with most Carrier centrifugal chillers produced over the last 30 years. Carrier chiller models covered include 19D low pressure chillers and 19E, F, 19XL, XR and 19XRV high-pressure chillers. Participants learn how to operate, maintain, troubleshoot, and service both the low- and high-pressure machines (including PIC controls). Studies include: centrifugal refrigeration cycles, compressor theory, lubrication cycles, purge operation, refrigerants, heat exchangers, and heat transfer. The course also covers troubleshooting techniques and equipment needed to record and analyze machine temperatures and pressures; performance using heat exchanger approaches; waterside flow rate analysis; maintenance requirements; and logging machine data. This course is mostly classroom instruction and includes numerous exercises using the classroom information to analyze performance. Successful completion of this course is required in order to attend the SER 130 Centrifugal Disassembly and Reassembly course.

Upon request, the EPA 508 certification can be held after class at a slight additional cost. This certification is required to handle refrigerants.

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.

HVAC Training Objectives

Learning Objectives

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

  • Identify and explain the operation of the refrigeration and lubrication cycle on 17/19 series Carrier chillers
  • Read a ladder diagram of basic centrifugal control circuit
  • Explain the operation of the guide vane control using the 32SM module
  • Determine proper chiller operation using tread charts and GPM flow
  • Identify and distinguish various centrifugal chiller starters
  • Identify PIC I and PIC II controls by sight

Learning Methods Used

This course 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.

Class Details

Topics Covered

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

  • Finding chiller information (1.0/0)
  • Product familiarization (1.0/0)
  • Reciprocating vs. centrifugal chillers (0.5/0)
  • Refrigerants usage and properties (1.5/0)
  • Electrical theory and review (2.0/0)
  • 19DH low pressure chillers (2.0/0)
  • P-h diagrams and chillers (1.0/1.0)
  • Nozzle arrangements (0.5/0)
  • 19D series low pressure construction (1.5/0)
  • 32SM control module (2.0/0)
  • 19EB high pressure chillers (1.0/0)
  • 19EB controls (1.0/0)
  • Chiller cycles: refrigerant, lube, motor cooling, purge (1.0/1.0)
  • 19 series high pressure chiller construction (2.0/0)
  • Motor starters (2.0/0)
  • 32MP controls (2.0/0)
  • Homework (1.0/0)
  • 19 series cycles : refrigerant, lube, motor cooling, purge (2.0/0)
  • Cycle analysis (2.0/1.0)
  • 19XL/XR PIC controls (1.0/0)

Class Requirements

Completion requirements

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

Prerequisite requirements


Suggested Background

For technicians just entering the HVAC field or persons with no field experience, this course 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 course 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

Class starts at 8 AM Monday and runs from 8 AM till 5 PM each day including Friday. Travel arrangements should be made accordingly.

Location & Lodging

Carrier University is located at 6540 Old Collamer Road South, East Syracuse, NY 13057. Lodging options can be found here.