i-HEATPUMP FTC Operational Data Explorer V12

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Operating mode

The Explorer analyses and displays a maximum 92-day window at once, but the pre-generated CSV and PDF are based on the full dataset. User-defined analysis can be used to produce custom reports based on the observation period and settings selected.

Steady-state heating transfer

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Calculated after the selected continuous-run stabilisation period.

Calculating

What does this mean?

This is a signed water-side heat-transfer estimate during continuous compressor-active heating, after a stabilisation period and excluding the final two minutes before a stop. It is more suitable for databook comparison than a whole-mode average, but remains an engineering estimate rather than a certified capacity measurement.

Estimated DHW thermal output

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Calculated after the first five minutes of qualifying DHW episodes.

Calculating

What does this mean?

This is the signed water-side heat-transfer estimate during established DHW operation. A five-minute warm-up filter removes most start-up sensor and transient effects; negative values are not silently clipped to zero. The result is an engineering estimate, not a certified heat-meter measurement.

Average DHW recovery

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What does this mean?

A recovery is a continuous DHW heating episode lasting at least five minutes. This figure is the mean duration of those episodes within the selected period.

Average DHW tank temperature rise

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Mean recorded tank-sensor rise per qualifying DHW recovery.

What does this mean?

For each DHW recovery, the cylinder temperature at the start is subtracted from the cylinder temperature at the end. The result shows the change seen by the controller's tank sensor during a typical recovery; it is not a whole-cylinder stored-energy calculation.

Average flow temperature

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Mean primary flow temperature over the selected window.

What does this mean?

This is the average measured primary leaving-water temperature across the currently selected data window and mode filter.

Flow-temperature range

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Minimum to maximum measured flow temperature.

What does this mean?

The lowest and highest primary flow temperatures recorded in the selected window.

Flow-temperature deviation (σ)

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Standard deviation of measured primary flow temperature.

What does this mean?

A smaller value means flow temperature remained more tightly clustered around its average; a larger value indicates wider variation during the selected period.

Average room temperature

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What does this mean?

The mean measured room temperature over the selected period. The range beneath it shows the lowest and highest recorded values.

Room-temperature stability

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Standard deviation (σ): smaller means more stable.

What does this mean?

Standard deviation measures how tightly the room temperature clustered around its average. A smaller number indicates steadier indoor conditions.

Within comfort tolerance

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Share of valid samples within the selected comfort tolerance.

What does this mean?

This compares each measured room temperature with the room-temperature target recorded at the same time. It is a simple comfort-control indicator, not a formal comfort standard.

Outdoor temperature before room temperature = out of comfort range

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What does this mean?

This reports the time-weighted average outdoor temperature in the preceding window set by the user-defined selected lag-before period. Out of range is set by the comfort tolerance user setting. It is descriptive and does not prove causality.

Average running frequency

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Average frequency after excluding single-sample start/stop transition values.

What does this mean?

A sample is treated as sustained running only when the compressor is non-zero on the previous, current and following records with no gap over two minutes. This removes one-sample startup/shutdown transition values.

Sustained frequency range

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What does this mean?

The minimum and maximum sustained running frequencies after excluding single-sample transitions between 0 Hz and normal operation.

Compressor starts

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What does this mean?

A start is counted when compressor frequency changes from 0 Hz to a non-zero value. Starts per hour are calculated across the selected observation period.

Average run / off period

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What does this mean?

Average continuous compressor-on duration versus average compressor-off duration. Data gaps longer than two minutes break an observation sequence.

Heating demand, compressor off, pump circulating

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Why is this interesting?

This identifies space-heating-mode samples where the compressor is at 0 Hz but primary water flow continues. It helps separate low-flow circulation behaviour from active heat-production flow modulation.

Average active vs off-circulation flow

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Primary flow while compressor is running versus compressor-off circulation.

What does this mean?

A comparison between primary flow rate during compressor-on and compressor-off circulation periods.

Qualifying flow adjustments

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What does this mean?

An engineering estimate and marker of qualifying space-heating periods where the primary flow rate is observed to change. Qualifying events are defined by the user-selected variables: flow-rate analysis window, qualifying flow-rate change, and flow analysis state. This feature is designed to assist users in identifying changes in flow rate so they can be assessed against the intended pump-speed control strategy and investigated for potential issues such as failing pumps or restrictions/blockages.

Space-heating flow range

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What does this mean?

The lowest and highest measured primary-water flow rates in the selected heating-flow analysis state. The commentary also shows how much valid operating time was spent at each extreme.

Space heating vs DHW flow rate

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Time-weighted average primary flow: space heating / DHW.

What does this mean?

A comparison of the time-weighted average primary flow rate during space-heating and DHW operation. Where the same primary pump serves both circuits, differences can assist investigation of hydraulic behaviour, including diverter-valve operation and potential restrictions such as a blocked DHW coil. Results should be assessed against the intended system configuration and pump-control strategy.

Temperature difference at low vs high flow

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What does this mean?

This compares the average flow/return temperature difference at the lowest and highest observed flow rates within the selected heating-flow analysis state.

Estimated compressor-active thermal energy

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Signed water-side transfer integrated only across continuous compressor-active intervals.

What does this mean?

This integrates signed calculated water-side transfer only where adjacent records both show compressor operation and primary flow, without bridging gaps. It avoids treating compressor-off circulation as delivered heating energy.

Average legionella cycle

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What does this mean?

The average duration of continuous recorded legionella-mode episodes lasting at least five minutes.

Average legionella recorded input

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Mean FTC-recorded electrical input per qualifying cycle.

What does this mean?

This sums the FTC's onboard electrical-energy values during each qualifying legionella cycle. It inherits the controller's coarse energy-monitoring resolution.

Series appearance

Click or drag on the chart to inspect a moment in time.

Component Status

Operating state–

Heat pump–

Pump 1–

Primary flow–

Chart points are decimated for display performance; calculations use the full selected record set. Times are shown in the installation clock time without browser timezone conversion.

FTC Operational Data Explorer

i-HEATPUMP FTC Operational Data Report

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How operation changed with the weather