Heating and Cooling Systems — Construction Management and Jobsite Maintenance Study Notes

Jobsite safety

A set of practices to prevent injuries and property damage while meeting legal requirements.

Employers' responsibilities

Providing training, enforcing safety procedures, supplying tools and PPE, and correcting unsafe conditions.

Workers' responsibilities

Following safety procedures, using PPE, reporting hazards, and stopping work when unsafe.

Hazard recognition

The process of actively scanning the work area for potential dangers before they result in incidents.

Common energy sources in HVAC hazards

Electrical, mechanical, thermal, chemical, and gravitational.

Electrical shock/arc flash hazards

Risks from live panels, improper lockout/tagout, damaged cords, or wet conditions.

Cuts and punctures hazards

Risks from sharp sheet metal edges, ductwork, zip screws, and hand tools.

Burns and fires hazards

Risks from torches, brazing, soldering, and contact with hot piping.

Asphyxiation/poisoning hazards

Risks from combustion products and refrigerant releases in poorly ventilated areas.

Pressurized systems hazards

Risks from sudden releases of refrigerant lines, nitrogen cylinders, and hydronic piping.

Falls hazards

Risks from ladders, scaffolds, roofs, and lift equipment.

Hierarchy of controls

A ranking of methods to reduce hazards, from elimination to PPE.

Elimination (hierarchy of controls)

Removing the hazard entirely.

Substitution (hierarchy of controls)

Replacing a hazard with something safer.

Engineering controls (hierarchy of controls)

Using methods like guarding and ventilation to reduce risks.

Administrative controls (hierarchy of controls)

Implementing procedures and training to enhance safety.

PPE (hierarchy of controls)

Personal protective equipment used as a last line of defense.

Lockout/Tagout (LOTO)

The process of preventing unexpected startup or release of stored energy during servicing.

LOTO workflow steps

Identify energy sources, shut down equipment, isolate energy, apply locks and tags, release stored energy, verify isolation.

Hot work activities

Processes like brazing, soldering, and cutting that pose fire risks.

Refrigerant safety management

Preventing leaks, using proper recovery equipment, and ensuring ventilation.

Pre-task safety plan (PTP)

A document outlining hazards and controls before starting a specific task.

Scope of work

A defined statement of what a team is responsible for in a project.

Construction drawings

Plans that show equipment locations, duct routes, and system layouts.

Specifications (specs)

Written requirements detailing materials, standards, and installation instructions.

Construction schedules

Tables that outline equipment capacities, requirements, and installation timelines.

RFI (Request for Information)

A formal question to clarify conflicts or ambiguities in documents.

Submittal

Documents sent for approval before starting installation work.

Critical path in scheduling

Tasks that control the overall completion date of a project.

Material management

The processes of receiving, storing, protecting, tracking, and staging HVAC materials.

Receiving and inspection

The process of verifying deliveries for accuracy and condition upon arrival.

Storage practices in HVAC

Methods to protect materials from damage and contamination while on-site.

Staging

The process of placing materials near points of use to improve efficiency.

Quality control (QC)

Checks that ensure the installed system meets design intent and performs reliably.

Testing in HVAC

Verifying that systems operate correctly and safely after installation.

Commissioning

The structured process of verifying that systems operate according to design and owner needs.

Turnover documentation

O&M manuals, as-builts, and warranty information handed over to the owner at project completion.

Preventive maintenance (PM)

Planned service aimed at preventing equipment failures and performance loss.

Root cause analysis

A method of identifying the fundamental reason for a problem to prevent its recurrence.

Daily log entry

Documentation of daily site activities, labor, and issues encountered.

Change order

A formal change that affects the scope, cost, or schedule of a project.

Field change

Allowed adjustments made on-site that don’t alter the agreed scope.

Jobsite maintenance responsibilities

Ongoing upkeep of tools, temporary systems, and work areas for safety and compliance.

Communication in construction management

Ensuring clarity and accountability through various communication channels.

Housekeeping on jobsite

Maintaining an organized and clean site to prevent accidents and injuries.