Warm Meeting Room After Fit-Out: Sensor Left in Cold Zone

A meeting room stays warm after a fit-out and rework is assumed. Whether the equipment is wrong or is being told the wrong thing.

By Team Snowflake | Updated 24 Aug 2026

Teaching case based on recurring Snowflake service patterns; identifying details are combined.

What gets specified

A fit-out with several ceiling units serving an open office and a separate meeting room. Equipment is installed, commissioned and handed over. The meeting room stays warmer than it should while the open office holds temperature correctly.

Setup: Daikin CassetteNew installOfficeKallang
Misread as: Equipment that has been installed badly, requiring rework on a newly finished space.
Check first: Which sensor each zone actually follows, checked room by room

What the drawing does not show

Correct equipment behaving incorrectly points at the instructions rather than the hardware. A control zone follows one sensor, and the room that sensor sits in decides what every unit on that zone does. Where a meeting room is wired to a zone whose sensor sits out in the open office, it keeps cooling until the open office is satisfied and takes no account of itself. Tracing which sensor each zone follows takes minutes and explains the whole complaint.

Correctly installed equipment operating without fault moves the question from the hardware to the controls.
The meeting room served by a zone whose sensor sits in the open office explains the shortfall exactly.
An open office holding its setting confirms the zone is doing its job for the space it measures.
A separate room without its own sensor cannot report its own condition to anything.

Why it goes wrong

Control zones are laid out on a services drawing and rooms are laid out on an architectural one. The two are produced at different times by different people. A room that gains walls late in a fit-out often keeps the zone it had when it was open floor. The installation is not defective, and nothing will be found by testing the equipment, because that equipment is faithfully serving a measurement taken somewhere else entirely.

What the fix involves

The enclosed room is given its own sensor and its own zone, which is a small piece of work on a finished ceiling and a large one if left until later. The general check belongs at handover: walk each enclosed space and confirm it is controlled by a measurement taken inside it. That is a five-minute exercise and it is not on most commissioning sheets.

How to tell it worked

Each enclosed room tested against its own setting rather than the building's. A room that reaches its own target independently of what the open floor is doing is correctly zoned.

Before you sign off

A room without a sensor is not really a zone

Zones follow sensors. A room with no sensor of its own takes its instructions from somewhere else.
Late partitions inherit the zoning of the open floor they were built on. Check every enclosed space.
At handover, confirm each room is controlled by a measurement taken inside that room.

Questions this case answers

Why is our meeting room warm when the rest of the office is cold?

Because the units serving it are told what to do by a sensor somewhere else. They stop cooling as soon as that other space is satisfied, and the enclosed room has no way to ask for more.

Do we need another cassette to fix an office hot spot?

No, not for this. The room is served by a zone whose sensor sits in the open office, so the equipment is working correctly; giving the enclosed room its own sensor and zone is the fix. That is small work while the ceiling is accessible and much larger once finishes are complete.

Our aircon shows no error code, so does that mean nothing is wrong?

An error-free display does not mean nothing is wrong. The equipment is operating without fault, but it is being told what to do by a sensor in another room. A room with no sensor of its own cannot report its own condition, so an error-free system can still leave an enclosed space warm.

What should an office fit-out handover record include for aircon?

Which sensor controls each enclosed room. Walk each space and confirm it is controlled by a measurement taken inside it, because late partitions inherit the zoning of the open floor and that check is not on most commissioning sheets.

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