FCU Selection Calculator
Static · formula-only · worked example computed when this page was built · no live data
The FCU Selection Calculator picks fan-coil units and chilled-water pipe size for a set of rooms from their cooling loads. Example: for four office rooms at 5 kW cooling each on 7/12 °C chilled water, Selected FCU = FCU-800, Unit capacity = 5.6 kW, Total connected capacity = 6.37 TR (per ARI 440 | ASHRAE 62.1 | ASHRAE 90.1 | PSME).
How it works
Computed from your inputs per ARI 440 | ASHRAE 62.1 | ASHRAE 90.1 | PSME. Anything the worked example does not state uses this calculator's standard default; the interactive version shows every input and lets you change it.
Worked example (HVAC & Cooling)
Inputs: four office rooms at 5 kW cooling each on 7/12 °C chilled water.
| Result | Value |
|---|---|
| Selected FCU | FCU-800 |
| Unit capacity | 5.6 kW |
| Total connected capacity | 6.37 TR |
Computed by WorkHive's calculation engine when this page was built; standard: ARI 440 | ASHRAE 62.1 | ASHRAE 90.1 | PSME.
How to use this calculator
- Read the worked example. It uses four office rooms at 5 kW cooling each on 7/12 °C chilled water and shows every number in the method.
- Follow the formula with your own figures: it returns Selected FCU, Unit capacity, Total load, computed per ASHRAE 62.1 | 90.1.
- To compute interactively, open the FCU Selection Calculator inside WorkHive's free Engineering Design suite (link below). It runs the same method with your inputs.
FAQ
What is a fan coil unit selection calculator?
The FCU Selection Calculator is a free online tool that picks fan-coil units and chilled-water pipe size for a set of rooms from their cooling loads. It shows the formula and a fully worked example so you can check the method, not just the number.
How is it calculated?
The result is computed from your inputs following ASHRAE 62.1 | 90.1. The worked example on this page shows a real computation with real numbers.
Is the calculator free?
Yes. WorkHive is free: this worked example is open to everyone, and the interactive calculator runs inside the free Engineering Design suite after a free sign-up (your work is saved to your account). WorkHive is a free, offline-first maintenance platform built for Philippine industrial plants.
Run it on your own numbers
Open the interactive FCU Selection Calculator in WorkHive. Free, and a free sign-up saves your calculations, BOMs and scope-of-works to your account.