🏭 Central Plant Design · UA / SMACNA
Central Plant Design Code Practice
Practice central-plant design — chiller and boiler plants, cooling towers, and VFDs — in real puzzles. An advanced CraftIQ specialty.
What you'll practice
- ✓Plant tonnage (GPM × ΔT / 24)
- ✓Chiller/boiler staging and efficiency
- ✓Cooling-tower and condenser-water sizing
- ✓Pump selection and VFD control
Code standards covered
The plant room, from tonnage to staging
A central plant is where a building's entire heating and cooling load concentrates into one room — and where a wrong decision costs the most. CraftIQ's central-plant track drills the reasoning that room demands: reading plant capacity from flow and temperature difference, understanding why staging order changes a plant's efficiency, and seeing how the condenser-water side — cooling towers included — limits everything downstream of it. Race-style puzzles make plant dynamics visible: which tower is most stressed, which section runs out of capacity first, what a VFD actually does to how a pump loads. It is the difference between an operator who follows the sequence and one who understands why the sequence exists. Boiler-side puzzles run the same discipline on the heating plant: staging, efficiency reasoning, and the hydronic questions that decide whether a plant delivers its nameplate.
Standards that govern the plant
Plant work sits at the intersection of several standards, and CraftIQ keeps them straight. ASHRAE 90.1 drives the efficiency requirements behind modern plant design — why variable flow, staging logic, and VFDs are the default rather than the upgrade. Hydronic piping falls under ASME B31.9, from supports to expansion. Motors, VFDs, and plant electrical gear fall under the NEC (NFPA 70). Equipment performance claims trace to AHRI rating standards, which is what makes a manufacturer's capacity number mean something. Every puzzle cites the standard its answer draws from, and the code library expands each citation into a plain-language explanation a plant crew can actually use. That grounding matters, because the plant room is where paper ratings meet installed reality.
For the people who will run the plant
This specialty is built for UA fitters and SMACNA sheet-metal workers heading into plant construction and service, and for operators who want the design reasoning behind the equipment they babysit at 3 a.m. It assumes journeyman-level fundamentals and builds the plant layer on top. Like all of CraftIQ it is free for individuals, plays in English or Spanish, and every puzzle has been code-audited. Training programs can license it for a cohort — plant knowledge is exactly the kind of institutional skill that retires with the old hands unless someone drills the next crew.
Start practicing freeCodes & standards for this trade
- ASHRAE StandardsEvery section CraftIQ tests, explained in plain language →
- ASME Codes & StandardsEvery section CraftIQ tests, explained in plain language →
- National Electrical Code (NFPA 70)Every section CraftIQ tests, explained in plain language →
Prepping for a license? Try the timed exam-prep mode.
Frequently asked questions
Does CraftIQ cover chiller plant math like GPM and delta-T?
Yes — reading plant capacity from flow and temperature difference is a core drill, worked as sizing puzzles in both directions. The goal is an operator or fitter who can sanity-check a plant number in their head before trusting a screen.
Is the central-plant track relevant to building operators and stationary engineers?
Very. It was built for the construction trades, but the content — staging, tower behavior, pump and VFD reasoning, efficiency standards — is exactly what separates an operator who understands the plant from one who watches alarms. Several puzzles are essentially operator judgment calls.
Does CraftIQ cover cooling towers?
Yes. Tower puzzles cover the condenser-water side of plant reasoning — why tower performance limits chiller performance, what stresses a tower, and how condenser-water decisions ripple through the plant. Race puzzles let you compare stressed towers side by side.
What trades does central-plant work draw on?
Primarily UA pipefitters for hydronic and steam piping and SMACNA sheet-metal workers for the air side, with plant electrical falling to electricians. The CraftIQ track reflects that mix — piping, airflow, and motor/VFD questions all appear, cited to their governing standards.