Block E – Maintenance and Repair

Trends

There is an increase in the use of electronic equipment controls and sensors. This has increased the need for more training in electronic diagnosis.

Related Components (including, but not limited to)

Ductwork, furnaces, air conditioners, rooftop units, makeup air units, fans, dampers, belts, pulleys, bearings, blower wheels, electronic and mechanical controls, filters, vents, humidifiers, scrubbers, lubricants, roofs, walls.

Tools and Equipment

See Appendix A.

Task 17 Performs scheduled maintenance.

Context

Sheet metal workers perform scheduled maintenance to minimize repair costs, increase longevity and enhance system performance.

Required Knowledge

• K 1 components such as belts, pulleys, bearings, fan blades, filters and motors
• K 2 normal operation and appearance of components
• K 3 frequency of scheduled maintenance
• K 4 sequence of equipment operation
• K 5 codes and regulations

Sub-task - E-17.01 Performs maintenance inspections.

Key Competencies

• E-17.01.01 obtain service schedule with a list of equipment and components to be inspected
• E-17.01.02 refer to inspection checklist for itemisation of equipment components to be inspected
• E-17.01.03 select and use tools and equipment such as multimeters, air testing equipment and nut drivers
• E-17.01.04 perform required tests, surveys or readings such as amp draws, air readings and filter conditions
• E-17.01.05 conduct sensory inspection to identify possible faults
• E-17.01.06 record and report all findings on inspection checklist
• E-17.01.07 keep record of inspection report on file

Sub-task - E-17.02 Services components.

Key Competencies

• E-17.02.01 refer to inspection checklist for parts
• E-17.02.02 refer to manufacturers’ specifications for normal operating conditions and specific accessories
• E-17.02.03 select and use tools and equipment such as grease guns, Allen keys and adjustable wrenches
• E-17.02.04 clean or replace filters
• E-17.02.05 clean components using methods such as de-greasing, using compressed air and vacuuming
• E-17.02.06 adjust pulleys and belts for required alignment and tension according to manufacturers’ specifications
• E-17.02.07 lubricate bearings according to manufacturers’ specifications
• E-17.02.08 re-check air and static pressures according to manufacturers’ specifications
• E-17.02.09 check amperage draw on direct drive components and compare to manufacturers’ specifications

Task 18 Repairs faulty systems and components.

Context

Sheet metal workers repair building systems and equipment such as heating, ventilation and air conditioning and conveyance systems to return them to normal operating conditions and specifications.

Required Knowledge

• K 1 normal operation and appearance of components
• K 2 diagnostic methods such as sensory inspections and use of testing devices
• K 3 sequence for removing and replacing components such as ductwork, material handling components, filters, belts, pulleys and motors
• K 4 patching methods such as welding, riveting and bonding
• K 5 basic electrical

Sub-task - E-18.01 Diagnoses system faults.

Key Competencies

• E-18.01.01 obtain information such as history of work done, deficiency report, maintenance records and, client feedback and observations to identify source of performance issues
• E-18.01.02 select and use tools and equipment such as pitot tubes, multimeters and air testing equipment
• E-18.01.03 perform required tests, surveys or readings such as amp draws, air readings and filter conditions
• E-18.01.04 check performance accuracy of system against design requirements
• E-18.01.05 conduct sensory inspections
• E-18.01.06 locate and identify worn, faulty or missing components
• E-18.01.07 troubleshoot system to identify potential source of problem
• E-18.01.08 recommend course of action such as repair or replacement of components

Sub-task - E-18.02 Repairs worn or faulty components.

Key Competencies

• E-18.02.01 select and use tools and equipment such as wrenches, hammers, drills and grinders
• E-18.02.02 measure and fabricate sheet metal transition and components enabling connection to existing system
• E-18.02.03 order components such as fan belts, motors and isolators
• E-18.02.04 shut off utility services such as gas and electrical to the appliance
• E-18.02.05 disassemble equipment and components in required sequence
• E-18.02.06 replace or modify faulty or obsolete components
• E-18.02.07 reassemble and tighten components
• E-18.02.08 perform tests, surveys or readings such as amp draws, air readings and filter conditions to verify that system is operating according to specifications