Recommended Data Points

If you are deciding which data points to make available in your visualization and which to collect for historical analysis, use the following list as the minimum required set.

The recommended logging interval is: 1–5 minutes.

A 15-minute interval represents the absolute bare minimum for any meaningful analysis. The only exceptions are technical limitations, such as those found in battery-powered M-Bus meters.

Do not be afraid of large volumes of stored data—if your I&C (BMS) supplier uses this as an argument against it, get a better system!

• Setpoint temperature / correction
• Room temperature
• Occupancy (card, sensor, etc.)
• Window status (Open/Closed)
• FCU mode (Cooling / Idle / Heating)

• Central air supply pressure difference
• Central air supply temperatures
• Fan speed or EC motor % modulation

• Cooling output temperature
• Common output temperature (Supply manifold)
• Cooling return temperature
• Common return temperature (Return collector)
• Branch setpoint temperatures
• Control valve positions (3-way valve %)
• Branch output temperatures
• Coolant pressure in the collector or water level in the tank (refilling)
• Outdoor temperature (for floating cooling water calculation, e.g., “minus 6°C”)
• Cooling machine fault
• Run command
• Mode: Compressor run / Freecooling

• Circulation pump status
• Current compressor power / Number of compressors running
• Cooling fan power / Number of fans running
• Cooling water quality (pH, conductivity)
• Flow switch status (upstream of pumps)
• Current mode: Mechanical / Freecooling / Averaging

• Cooling output temperature
• Common output temperature (Supply manifold)
• Cooling return temperature
• Common return temperature (Return collector)
• Branch setpoint temperatures
• Control valve positions (3-way valve %)
• Branch output temperatures
• Water level in the storage tank (refilling)
• Outdoor temperature
• Cooling tower fan fault
• Fan run command

• Circulation pump status
• Cooling water quality (pH, conductivity)
• Flow switch status (upstream of pumps)

• Burner/Boiler status
• Current burner power
• Boiler run command
• Boiler output temperature
• Boiler setpoint temperature
• Boiler return temperature
• Boiler pump command
• Boiler pump status
• Common output temperature (Supply manifold)
• Common return temperature (Return collector)
• Branch setpoint temperatures
• Control valve positions (3-way valve %)
• Branch output temperatures
• Outdoor temperature
• Measured heating system pressure
• Water refilling status
• Equithermal (weather-compensated) regulation parameters (design temperatures)
• Calculated equithermal temperature
• Equithermal regulation correction
• Time schedules (store currently valid status in history, e.g., DAY/NIGHT)
• Night setback settings

• Burner fault
• CH4 Detection (Stage II alarm)
• CO Detection (Stage II alarm)
• Max room temperature (Boiler room emergency limit)
• Min system pressure (Below emergency limit)
• Room flooding detection
• Air supply (Forced/Emergency ventilation dP detection)
• Emergency Stop button status
• CH4 Detection (Stage I warning)
• CO Detection (Stage I warning)
• Water refilling fault

• Circulation pump status
• Boiler flooding sensor
• Pressure difference (Collector – Manifold)
• Distribution system pressure difference

• Current boiler sequence / Number of boilers enabled
• Current power of each boiler
• Output temperature of each boiler
• Common output temperature (Supply manifold)
• Common return temperature (Return collector)

• Burner fault
• Burner status
• Boiler steam output pressure
• Boiler output temperature
• Common steam output pressure (Manifold)
• Boiler condensate temperature
• Condensate collection tank level
• Condensate storage tank level
• Feedwater tank level
• Setpoint pressure
• Steam pressure reduction output
• Feedwater pump status
• Condensate pump status
• Feedwater pump fault
• Condensate pump fault
• Water treatment / Reverse osmosis status
• Water treatment / Reverse osmosis fault
• Current burner power
• Feedwater quality (pH, conductivity)
• [All commands/manual overrides]

• Boiler flooding sensor (level gauge)
• Feedwater system pressure

• Max room temperature (Boiler room emergency limit)
• Max boiler output temperature
• Min system pressure (Below emergency limit)
• Room flooding detection
• Emergency Stop button status
• HDO (Ripple Control) signal
• Command for individual stages
• Status of individual stages
• Boiler output temperature
• Boiler setpoint temperature
• Boiler return temperature
• Boiler pump command
• Boiler pump status
• Common output temperature (Supply manifold)
• Common return temperature (Return collector)
• Branch setpoint temperatures
• Control valve positions (3-way valve %)
• Branch output temperatures
• Outdoor temperature
• Measured heating system pressure
• Water refilling status
• Equithermal regulation parameters
• Calculated equithermal temperature
• Equithermal regulation correction
• Time schedules (store currently valid status)
• Night setback settings

• Meter reading (Cumulative value)
• Meter fault
• Communication error

• Instantaneous values
  • Instantaneous consumption
  • Instantaneous power
  • Flow rate
  • Currents
  • Temperatures

• Unit operation status (Heating/Ventilating/Cooling)
• Room request (Power/Temperature/Correction)
• Setpoint temperature (Supply, Extract, Room)
• Outdoor air temperature
• Supply air temperature
• Supply air humidity
• Room humidity / Air quality / CO2
• Extract air temperature
• Temperature after heat recovery (if available)
• Heating control valve position
• Heating pump status
• Cooling control valve position
• Cooling pump status
• Plate heat exchanger (Bypass damper position % recovery)
• Rotary heat exchanger (Status / % control)
• Mixing damper position
• Frost protection status
• Fan status (%, dP, Hz)
• Humidifier status/power
• Damper positions (Supply, Extract, Outdoor)
• [All commands/manual overrides]
• Heat recovery dP
• Filter dP
• Pump/Inverter/Recovery/Humidifier faults

• Heating coil return temperature
• Room dP

• Common output temperature (Supply manifold)
• Common return temperature (Return collector)
• Branch setpoint temperatures
• Control valve positions (3-way valve %)
• Branch output temperatures
• Outdoor temperature
• Measured heating system pressure
• Water refilling status
• Equithermal regulation parameters
• Calculated equithermal temperature
• Equithermal regulation correction
• Time schedules
• Night setback settings

• Max room temperature (Emergency limit)
• System pressure (Below emergency limit)
• Room flooding detection
• Emergency Stop button status
• Max return temperature to District Heating (CZT)
• Max primary output temperature
• Max Domestic Hot Water (DHW) temperature
• Loss of voltage or communication

• Outdoor air temperature
• Output temperature
• Accumulation tank temperature
• Domestic hot water temperature
• Power modulation
• Operating mode
• Required circuit temperature
• Required hot water temperature
• External power modulation setting
• Required room temperature
• Fault states
• Fault reset

• Refrigerant circuit details (Evaporation/Condensing temps, 4-way valve status, Expansion valve % open)
• Compressor details (Starts, run hours, etc.)
• Circulation pump parameters (% modulation, faults)
• Heat production efficiency details

• Temperatures (Inlet, Outlet, Accumulation tank, Engine oil, Primary engine supply/return)
• Power modulation
• Electrical power output
• Grid status
• Operating mode
• Setpoints (Temperature, External power modulation)
• Fault reset
• Operating hours
• Fault states

• Grid status details
• Circulation pump parameters (% modulation, faults)
• Engine details
• Exhaust gas details
• Pressures (Oil, Gas, Primary and Secondary circuits)
• Hours until maintenance
• Electrical and thermal efficiency details

• Instantaneous solar power (per inverter)
• Instantaneous consumption (per phase L1, L2, L3 for asymmetrical inverters)
• Instantaneous grid feed-in (per phase L1, L2, L3)
• Battery SoC (State of Charge %)
• Total energy produced
• Faults
• Required inverter power (if available)
• Required grid feed-in power (if available)

• Input/Output phase details (Voltage, Frequency, Current, Power)
• Battery details (Voltage, Current, Temperature, Status, TimeToGo)
• Solar production details per tracker/string (Voltage, Current, Power)