FA-92739 / HVAC thermostat control / Member archive

Time-proportioning emits one-minute burner cycles · case 04

Small errors produce one-minute burns that never let the heat exchanger reach temperature.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Time-proportioning heating thermostat with a cycles-per-hour setting, sampled per minute. The cycle length is 60 // cph minutes. At each cycle start the error (setpoint - temp) is clamped to 0..band and the on time is error/band of the cycle rounded half up; an on time of 1 minute is extended to the 2-minute minimum, and an off time of 1 minute is eliminated (full on). The output is on for the first on-time minutes of the cycle. Return the heat output per minute.

Why this case matters

Residential and light-commercial thermostats make these decisions sample by sample; each defect changes equipment calls in a way that shows up as short cycling, comfort complaints or equipment stress.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: scenario 12	`[true, false, false, false, false, false, false, false, false, false, false, false, true, false, false, false, false, false, false, false, false, false, false, false, true, true, true]`	`[true, true, false, false, false, false, false, false, false, false, false, false, true, true, false, false, false, false, false, false, false, false, false, false, true, true, true]`	Failed

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