The Bloomeco OPV is a domestic hot water heat pump with integrated ventilation. It heats water using an air-source heat pump compressor with an electric backup heater, and provides controlled air extraction/supply. TapHome connects directly via Modbus TCP — no additional gateway is required.

The template provides 193 devices covering operating mode control, target temperature setpoints, ventilation speed and mode, defrost management, solar collector integration, floor heating/cooling, PV self-consumption modes, SG Ready interface, legionella protection scheduling, low electricity tariff scheduling, power metering, diagnostics, and error counters.

Configuration#

When importing the template in TapHome, provide:

• IP Address — the unit’s IP address on the local network
• Slave ID — Modbus slave address (configurable via register H:39, default varies by unit)

Assign a static IP address or DHCP reservation to the Bloomeco OPV in the router settings to prevent the address from changing after a power cycle.

The Modbus communication parameters (baud rate, parity) can be configured via the template itself using the Modbus Address, Modbus Baud Rate, and Modbus Parity devices. After changing these, write to the Modbus Modify device to apply the new settings.

Device capabilities#

Operating mode control

• Heater Mode — select from AUTO, ECO, BOOST, BACKUP, SILENT, and HOLIDAY modes. Each mode uses a different target temperature and operating strategy.
• AUTO / ECO / BOOST / Backup Target Temperature — individual temperature setpoints for each mode. Current water temperature is read from sensor T3 (water tank top).
• Forced Operation — overrides normal scheduling to run the heat pump immediately.

Temperature monitoring

The template exposes three primary temperature sensors:

Additional readings include Average Air Temperature, Average Evaporator Temperature, and temperature differentials (T1-T2 delta) used by the defrost algorithm.

Ventilation control

• Ventilation Mode — Off, Single speed, 2x speed, or Max
• Ventilation Speed — Low, Medium, or High preset level
• Ventilation Min/Medium/Max/AUTO Speed — configurable speed setpoints as percentage (0–100%) for each level
• Fan RPM — read-only actual fan speed
• Fan Speed Setpoint — current target fan speed

Defrost management

The heat pump performs automatic defrost cycles to prevent ice buildup on the evaporator. The template provides both monitoring and configuration:

• Defrost Active / Defrost Fan Active — real-time defrost status flags
• Defrost Stop Temperature — temperature at which the defrost cycle ends
• Defrost Delta T Min — minimum temperature differential to trigger defrost
• Defrost Admitted Variation — allowed temperature variation during defrost
• Fan Defrost Temperature — fan activation temperature during defrost
• Min/Max Defrost Time — configurable duration limits
• Max Defrost Interval — maximum time between defrost cycles
• Defrost Activation Counter / Defrost Runout Counter — cycle statistics

Solar and PV integration

• Solar — enable/disable solar collector input
• Solar Temperature Max — maximum solar collector temperature
• Solar Delta T Min — minimum temperature differential for solar collector activation
• Extra Function — output selector: Off, Solar, Floor heating, or Cooling
• PV Mode — photovoltaic integration: OFF, ECO (self-consumption priority), or STORAGE (heat storage from excess PV)

Floor heating and cooling

• Floor Heating — enable/disable floor heating output
• Floor Heating Temperature — target temperature setpoint
• Cooling — enable/disable cooling output
• Cooling Temperature — target temperature setpoint

The Cooling switch (H:21) writes to register H:1 instead of H:21 — this is a known template anomaly. Verify the behavior on the actual unit before relying on this control.

SG Ready and smart grid

• SG Ready — enable/disable the SG Ready smart grid interface
• SG1 Input / SG2 Input — read-only digital inputs for SG Ready signals
• SG Ready State — current SG Ready operating state

Low tariff scheduling

The template provides three time slots each for weekdays and weekends to schedule heat pump operation during low electricity tariff periods:

• Low Tariff Mode — OFF, STANDARD, or Optimal scheduling strategy
• Low Tariff Weekday/Weekend Start/End #1–#3 — start and end hours for each slot
• Low Tariff State — current low tariff active/inactive status

Legionella protection

• Legionella Protection — enable/disable periodic high-temperature heating cycle
• Legionella Target Temperature — temperature for the legionella cycle
• Legionella Day — day of week for the scheduled cycle (Monday–Sunday)
• Legionella State / Last Legionella Date — monitoring of protection status and last execution

External control and inputs

• External Control — input mode: Off, Hygrostat, Max, or ON/OFF
• External Control State — current external control status
• Analog Voltage Input — 0–10V analog input reading

Power and energy metering

• Electrical Power — instantaneous electrical power consumption
• Total Power — total power reading
• Fan Power / Compressor Power / HP Total Electrical Power — component-level power breakdown
• Water Power — thermal power delivered to water
• Heating Coefficient — COP (coefficient of performance)
• HP Electrical Energy / HP Thermal Energy / E-Heater Electrical Energy — cumulative energy counters (MWh)

Running hours and counters

• HP / E-Heater / Fan Running Hours — cumulative operating hours (in 2-hour increments)
• HP / E-Heater / Fan Running Seconds — fine-grained running time
• E-Heater Start/Stop Counter — cycle count
• Power On Count — device boot counter
• Filter Running Hours — filter usage tracking with configurable timer and reset

Component status monitoring

The template provides real-time status flags for all major components:

• Heat Pump State / Compressor State — running state
• Hot Mode Active / Cold Mode Active — current heating or cooling operation
• Evaporator / Cold Evaporator / Hot Evaporator State — evaporator circuit status
• Relay states — R1 Extra, R2 Defrost, R3 Fan, R4 Heat Pump, R5 Electric Heater, R6 Pressostat
• Sensor flags — T1–T5 status flags

Error counters

Dedicated error counters for each sensor and subsystem: T1–T5 sensors, pressostat, evaporator, cold evaporator, hot evaporator, and Modbus communication. An Error List register provides a consolidated error code.

System configuration

• Clock/Calendar — hour, minutes, day, month, year, day of week
• Display Language — English or German
• Display Contrast — 0–8 levels
• Daylight Saving — DST enable/disable
• Service Password — access to service menu
• Save/Restore Setpoints — backup or restore all configuration
• Reset / Reset All / Reset Event Log — various reset commands
• Model ID / Software Version / Hardware Version — device identification

Diagnostic and debug values

ADC channel readings (CH2–CH15), stability counters (T1, T3, Fan), state timers (heat pump, defrost valve, compressor), and internal debug accumulators are available for advanced troubleshooting.

Troubleshooting#

No Modbus communication

1. Verify the Ethernet cable connection to the Bloomeco OPV unit
2. Confirm the unit’s IP address — check the router’s DHCP lease table
3. Ensure TapHome Core and the OPV unit are on the same network/subnet
4. Check that no firewall is blocking port 502
5. Verify the Modbus slave ID matches the template import parameter

Register conflicts

Two register addresses are shared between multiple functions:

Use caution when writing to these registers — verify the intended function is being triggered.

Unexpected temperature readings

Temperature values are stored as raw integers divided by 10 (e.g., raw value 450 = 45.0 C). If readings appear 10x too high or too low, check whether the conversion is being applied correctly.