Temporary Chiller Installation JHA (Job Hazard Analysis / Activity Hazard Analysis)
Updated 2026-06-23
A Temporary Chiller Installation JHA (Job Hazard Analysis / Activity Hazard Analysis) is the plan that keeps the crew installing a temporary chiller safe from the heavy-equipment rigging, from the temporary piping and electrical connections, and from refrigerant hazards. Temporary chiller installation sets and connects a rental/temporary chiller to provide interim cooling — combining the heavy-equipment-rigging hazard, the temporary-connection (piping and electrical) hazard, and the refrigerant hazard. This guide walks through building a Temporary Chiller Installation JHA that names the heavy-equipment-rigging, temporary-connection, and refrigerant hazards and assigns the rigging, connection, and refrigerant controls that hold up in the field.
Why temporary chiller installation needs its own JHA
Temporary chiller installation sets and connects a temporary or rental chiller (often a trailer-mounted or skid air-cooled chiller) to provide interim cooling during construction, commissioning, or a permanent-system outage — positioning the chiller, making temporary chilled-water piping connections (hoses/spool pieces), and making temporary electrical connections (significant power for the chiller). The defining features are the heavy chiller unit and the temporary piping and electrical connections. The hazards combine the heavy-equipment rigging (the temporary chiller is a heavy unit — offloading, positioning, and setting it brings rigging/crane, heavy-load, and struck-by hazards), the temporary connection (making temporary chilled-water piping connections (hoses, quick-connects, spool pieces — with the pressure and any charged-system tie-in) and temporary electrical connections (significant power — shock, arc flash, and the temporary electrical hazards)), the refrigerant (the chiller contains refrigerant — a refrigerant leak/exposure hazard, and the refrigerant system), and the positioning and the outdoor/trailer aspects. The heavy-equipment rigging and the temporary connection justify a dedicated JHA.
Breaking temporary chiller installation into steps
The steps for a Temporary Chiller Installation JHA follow the chiller:
- Plan the placement, rigging, and connections
- Offload and rig the chiller into position
- Make the temporary chilled-water piping connections
- Make the temporary electrical connections (de-energized)
- Verify the refrigerant system and connections
- Manage the rigging, connection, and refrigerant hazards
- Start up and verify the temporary cooling
- Complete
Each step carries a hazard, and the heavy-equipment rigging, the temporary connection, and the refrigerant are where the most significant risks concentrate.
The hazards step by step
Heavy-equipment rigging
The temporary chiller is a heavy unit — offloading, positioning, and setting it brings rigging/crane, heavy-load, and struck-by hazards. The controls are a lift/rigging plan (rated crane/rigging or offloading equipment for the chiller weight, qualified operator/rigger), verified weights, exclusion zones under the lift, tag lines, controlled positioning, and the rigging controls. The heavy-equipment rigging is a defining hazard. (These follow the lifting/rigging fundamentals.)
Temporary connection
Making temporary chilled-water piping connections (hoses, quick-connects, spool pieces — with the pressure and any charged-system tie-in) and temporary electrical connections (significant power) brings connection failures under pressure, and the temporary electrical (shock, arc flash). The controls are secure rated piping connections (hoses/connections rated for the pressure, restrained), tie-in controls where connecting to a charged system, de-energized qualified electrical connection (LOTO of the power source, verifying de-energized, proper temporary power/cabling rated for the load, GFCI), arc-flash PPE for any energized electrical work, and the connection controls. The temporary connection (piping and electrical) is a defining hazard. (These follow the mechanical-connection and electrical-work fundamentals.)
Refrigerant
The chiller contains refrigerant — a refrigerant leak/exposure hazard (asphyxiation in enclosed spaces, frostbite from liquid refrigerant, and the refrigerant handling if any refrigerant work), and the refrigerant system. The controls are awareness of the refrigerant (leak detection, ventilation), no refrigerant release, qualified refrigerant handling if any refrigerant work is needed, and the refrigerant controls. (These follow the refrigerant fundamentals.)
Positioning and outdoor/trailer
The positioning and the outdoor/trailer aspects (the chiller is often outdoor/trailer-mounted) carry their hazards (positioning, the outdoor setup, trailer). The controls are safe positioning and outdoor/trailer setup, and the positioning controls. (These follow the material-handling fundamentals.)
A simple Temporary Chiller Installation JHA structure
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Plan | Rigging / connections | Plan placement, rigging, connections | manufacturer |
| Offload/rig | Heavy load / struck-by | Lift plan, rated rigging, exclusion zones, tag lines | OSHA 1926.1425 |
| Piping connections | Connection failure | Secure rated connections, restrained, tie-in controls | ASME B31.9 |
| Electrical connections | Shock / arc flash | De-energized qualified connection, LOTO, arc-flash PPE | NFPA 70 |
| Verify refrigerant | Refrigerant leak | Refrigerant awareness, leak detection, ventilation | EPA 608 |
| Start up | Cooling / system | Start up and verify temporary cooling | manufacturer |
Rigging safety and safe temporary connections
A Temporary Chiller Installation JHA centers on rigging safety and safe temporary connections. The rigging safety addresses the heavy chiller unit — controlled by a lift/rigging plan (rated crane/rigging, qualified operator/rigger), verified weights, exclusion zones, and controlled positioning. The safe temporary connections address the piping and electrical — controlled by secure rated piping connections (restrained, tie-in controls), de-energized qualified electrical connection (LOTO, verified de-energized, proper temporary power, GFCI), and arc-flash PPE for any energized work. And the refrigerant gets awareness and leak-detection controls. A JHA built on rigging safety and safe temporary connections, with refrigerant controls, addresses the hazards that define temporary chiller installation.
From the field: what actually goes wrong
In fourteen years across federal, heavy civil, and industrial projects, temporary chiller installation is a fast rig-and-connect job — get interim cooling online — and the defining hazards are the heavy rigging and the temporary connections. The heavy-equipment rigging is the first — a temporary chiller is a heavy unit (often trailer-mounted or skid-mounted), so offloading, positioning, and setting it brings rigging and crane hazards, heavy-load hazards, and struck-by hazards. So a lift and rigging plan (rated crane or offloading equipment for the chiller weight, a qualified operator and rigger), verified load weights, exclusion zones under the lift, tag lines, and controlled positioning are the controls. The chiller weight and the offload are where the rigging discipline matters.
The temporary connection is the second defining hazard, and it has two sides — piping and electrical. On the projects I have run, the temporary chilled-water piping connections (hoses, quick-connects, spool pieces) must be secure and rated for the pressure and restrained (a connection that fails under pressure whips or sprays), with tie-in controls where connecting to a charged system. And the temporary electrical connection is significant — a temporary chiller draws real power, so the electrical connection is made de-energized and qualified (LOTO of the power source, verifying de-energized), with proper temporary power and cabling rated for the load, GFCI, and arc-flash PPE for any energized work. The temporary electrical is where the serious electrical hazard is, because it is significant power made up as a temporary connection under time pressure. The refrigerant (the chiller contains refrigerant — a leak/exposure hazard, managed by awareness, leak detection, and ventilation) and the positioning/outdoor aspects round it out. The JHA built on rigging safety and safe temporary connections is the one that protects the temporary-chiller crew.
The bottom line
A Temporary Chiller Installation JHA names the heavy-equipment-rigging, the temporary-connection (piping and electrical), and the refrigerant hazards with specific controls — a lift/rigging plan with rated rigging and exclusion zones for the heavy chiller, secure rated piping connections and de-energized qualified electrical connection with arc-flash PPE for the temporary connections, and refrigerant awareness with leak detection. The heavy rigging and the temporary connections are the defining concerns. The JHA that manages both is the one that protects the crew.
Frequently asked questions
What rigging hazards does a temporary chiller pose?
A temporary chiller is a heavy unit (often trailer- or skid-mounted), so offloading, positioning, and setting it brings rigging/crane, heavy-load, and struck-by hazards. Controls are a lift/rigging plan (rated crane/rigging or offloading equipment for the chiller weight, qualified operator/rigger), verified load weights, exclusion zones under the lift, tag lines, controlled positioning, and the rigging controls.
What are the two sides of the temporary connection hazard?
The temporary connections are piping and electrical: the chilled-water piping connections (hoses, quick-connects, spool pieces) can fail under pressure (whip/spray), and the electrical connection is significant power (shock, arc flash). Controls are secure rated piping connections (restrained, tie-in controls where charged), de-energized qualified electrical connection (LOTO, verified de-energized, proper temporary power/cabling, GFCI), and arc-flash PPE for any energized work.
Why is the temporary electrical the serious electrical hazard?
A temporary chiller draws significant power, and the electrical connection is made up as a temporary connection, often under time pressure to get cooling online — so the shock and arc-flash hazards of significant power apply to a temporary, field-made connection. Controls are de-energized qualified electrical connection (LOTO of the power source, verifying de-energized), proper temporary power and cabling rated for the load, GFCI, arc-flash PPE for any energized work, and treating the temporary electrical as the serious connection it is.
What refrigerant hazards apply?
The chiller contains refrigerant, so there is a refrigerant leak/exposure hazard — asphyxiation in enclosed spaces (refrigerant displaces oxygen), frostbite from liquid refrigerant, and the refrigerant handling if any refrigerant work is needed. Controls are awareness of the refrigerant (leak detection, ventilation), no refrigerant release, qualified refrigerant handling if any refrigerant work is done, and the refrigerant controls.
Related JHAs
- Chiller Installation JHA — the permanent-chiller fundamentals
- Chiller Plant Piping Tie-In JHA — the piping tie-in
- Temporary Generator Fueling JHA — related temporary-equipment work
- Lifting and Rigging JHA — the rigging fundamentals
Written by Mustafa Tok, CSP, ASP, CHST — OSHA Authorized Outreach Trainer with 14+ years of international construction safety experience across federal, heavy civil, and industrial projects.