Troubleshooting Applied Rooftop Units
SER 147

The Packaged Variable Volume Commercial Rooftop service course is for technicians servicing Carrier Variable Volume-Zoned rooftop units. This is the second of a two-sequenced training course on commercial rooftop units and deals with the industry’s most common packaged product in the over 20 ton market. The class provides detailed training intended to improve the troubleshooting skills and product knowledge of HVAC technicians. This course covers the Carrier A, Z, P and N Series Rooftops with ComfortLink Controls. This 3-day training session is conducted utilizing classroom presentations and supplemented with simulator exercises on actual unit control panels. Students will learn how to use the system controls and the latest Controls & Troubleshooting documents to quickly determine and repair system faults. The simulator exercises cover the three modes of operation: Cooling, Heating and Ventilation. There are over 16 electrical faults built in each simulator, allowing the technician to experience the most common problems encountered in the field. Technicians work their way through the panel’s bug list to ensure a hands-on comfort level with each unit type. Classroom activities include a detailed coverage of installation, startup, maintenance, and troubleshooting of the refrigeration, heating, economizer, and system option. Over 30% of the class involves lab exercises on actual unit control panels.

Who should attend this class

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 course each student should be able to:

• Identify the fan, compressor, heating section, economizer and using lab books the control components and describe the purpose and function of each
• Describe the differences in VAV, Staged Air Volume and C V and explain the differences and the purpose of each in these different system applications
• Demonstrate using lab simulators the sequence of operation for the A, Z, P and N Series units and indicate the control components are responsible for each step of safe operation
• Confirm using the start-up checklist the proper installation of the unit including location, mounting, power, piping and duct connections and also identify any components that require repositioning or additional assembly
• Successfully configure in a lab exercise the ComfortLink controls including unit type, size, components, time, date, occupancy and holiday schedules, and enable FIOPs and accessories, input set points and limits as required per job
• By using the ComfortLink Controls Test function successfully start-up, check and test the units operation and performance on a lab simulator
• Using a lab simulator, troubleshoot the unit refrigeration, heating, economizer, airside, and control system to identify failed components and inefficient operation
• Use the unit Service and Maintenance book to accurately explain how to perform the daily, monthly, seasonal and annual maintenance procedures requires in providing efficient operation and long life
• Use the unit Service and Maintenance book to accurately describe service procedures required on R-410A systems; to include replacement of compressors, coils, fans and motors including refrigerant recovery and charging

Training 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.

Topics Covered

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

• 48/50A series rooftop familiarization (2.0/0)
• 48/50A series controls and troubleshooting (2.0/1.0)
• 48/50A quick start (1.0/0)
• 48/50A controls lab (0/3.0)
• Homework (0/0.5)
• 48/50Z series familiarization and controls (2.0/0)
• 48/50P series familiarization and controls (2.0/0)
• 48/50N series familiarization and controls (2.0/0)
• Homework (0/0.5)
• Large rooftop unit controls and electrical faults lab (0/4.0)
• Sum Z (1.0/0.5)
• N Series control lab (0/3.0)
• A series control lab (0/3.0)

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

None.

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 5900 Northwoods Business Parkway, Charlotte, NC 28269. Lodging options can be found here.