System Overview
This document provides a functional diagram and detailed component list for the Komfovent Kombi system, designed for heating and domestic hot water (DHW) supply. The system integrates a heat pump, air handling, and hydronic circuits, controlled by dedicated electronic boards.
System Components
The following table lists the identified components and their functions:
| ID | Component Name | Description |
|---|---|---|
| 1 | Water Supplied to Heating System | Indicates water flow into the heating circuit. |
| 2 | Water Returning from Heating System | Indicates water flow returning from the heating circuit. |
| 3 | Heating System Inlet | Connection point for filling or servicing the heating system. |
| 4 | Domestic Cold Water Inlet | Inlet for cold water supply to the DHW system. |
| 5 | Domestic Hot Water Supplied to System | Outlet for hot water supplied to the building. |
| 6 | Hot Water Recirculation Inlet | Optional inlet for hot water recirculation to maintain temperature. |
| ODA | Outdoor Air | Air drawn from the outside environment. |
| SUP | Supply Air | Air supplied to the conditioned space. |
| ETA | Extract Air | Air removed from the conditioned space. |
| EHA | Exhaust Air | Air expelled from the system. |
| 1 | Heat Pump Heat Exchanger | Primary heat exchanger for the heat pump. |
| 2 | Heat Exchanger (Refrigerant - Water) | Heat exchanger transferring heat between refrigerant and water. |
| 3 | One Way Valve | Valve allowing flow in only one direction. |
| 4 | Liquid Receiver | Stores liquid refrigerant. |
| 5 | Filter - Dryer | Removes moisture and contaminants from the refrigerant. |
| 6 | Sight Glass for Moisture Indication | Visual indicator for refrigerant state and moisture content. |
| 7 | Manometer Connection Points | Points for connecting pressure gauges. |
| 8 | Suction Accumulator | Prevents liquid refrigerant from entering the compressor. |
| 9 | Rotary Heat Exchanger | Heat exchanger, likely for energy recovery from exhaust air. |
| 10 | Water Air Heater | Heats air using water. |
| 11 | Manometer | Measures pressure. |
| 12 | Air Bleeding Valves | Valves for removing air from the system. |
| 13 | Water Shut-off Valves | Valves to isolate water sections. |
| 14 | Expansion Vessel for Heating System (12 l) | Absorbs pressure fluctuations in the heating circuit. |
| 15 | Expansion Vessel for Domestic Hot Water (8 l) | Absorbs pressure fluctuations in the DHW circuit. |
| 16 | Domestic Hot Water Tank (186 l) | Stores hot water for domestic use. |
| 17 | Coarse Water Filter | Initial filter for water impurities. |
| 18 | Safety Valve (6 bar) | Protects system from overpressure. |
| 19 | Safety Valve (3 bar) | Protects system from overpressure. |
| B1 | Supply Temperature Sensor | Measures supply air temperature. |
| B2 | Extract Temperature Sensor | Measures extract air temperature. |
| B3 | Outdoor Temperature Sensor | Measures ambient outdoor air temperature. |
| B4 | Exhaust Temperature Sensor | Measures exhaust air temperature. |
| B5 | Return Water Temperature Sensor | Measures return water temperature. |
| B14 | Temperature Sensor After Exchanger | Measures temperature downstream of a heat exchanger. |
| DT1 | Discharge Temperature Sensor | Measures discharge temperature, likely refrigerant. |
| DR 200 | Rotary Heat Exchanger Controller Board | Control unit for the rotary heat exchanger. |
| EH | Electric Heater | Auxiliary electric heating element. |
| EXV1 | Electronic Expansion Valve 1 | Regulates refrigerant flow. |
| EXV2 | Electronic Expansion Valve 2 | Regulates refrigerant flow. |
| F1 | Outdoor Air Filter | Filters incoming outdoor air. |
| F2 | Extract Air Filter | Filters air being extracted from the space. |
| F3 | Heat Pump Air Filter | Filters air for the heat pump's operation. |
| HC1 | Heater of Condensate Drip Pan | Heats the condensate collection tray to prevent freezing. |
| HPT1 | High Pressure Sensor | Monitors high pressure in the refrigerant circuit. |
| HP1 | High Pressure Protection | Safety device for high pressure conditions. |
| KM1 | Compressor | The main component of the heat pump, compressing refrigerant. |
| LP1 | Low Pressure Protection | Safety device for low pressure conditions. |
| LPT1 | Low Pressure Sensor | Monitors low pressure in the refrigerant circuit. |
| M1 | Rotor Motor | Motor driving a component, likely a fan or pump. |
| P1 | Air Pressure Drop Sensor | Measures pressure difference across an air component (e.g., filter). |
| RG1 | C9 Controller Board | Control board for the C9 system. |
| RG2 | Kombi Controller Board | Control board for the Kombi unit. |
| RG3 | Kombi Touch Controller Board | Control board for the Kombi Touch unit. |
| S1 | Main Circulation Pump | Circulates water in the primary heating loop. |
| S2 | Circulation Pump for Heating System | Circulates water in the heating system. |
| S4 | DHW Circulation Pump (Optional) | Circulates domestic hot water for recirculation. |
| ST1 | Suction Gas Temperature Sensor | Measures the temperature of refrigerant gas entering the compressor. |
| SVR | 4-Way Valve | Reverses refrigerant flow, typically for defrost or cooling. |
| SVB1 | Solenoid Valve (Subcooling) | Controls refrigerant flow related to subcooling. |
| SVD1 | Solenoid Valve (Defrost) | Controls refrigerant flow during defrost cycles. |
| T1 | Outdoor Temperature Sensor for Heat Pump | Measures outdoor air temperature for heat pump operation. |
| T2 | Air Temperature Sensor After Evaporator | Measures air temperature after the evaporator. |
| T3 | Condenser Refrigerant Temperature Sensor | Measures refrigerant temperature at the condenser. |
| T4 | Temperature Sensor of Supply Water from Condenser | Measures water temperature leaving the condenser. |
| T5 | Temperature Sensor of Return Water to Condenser | Measures water temperature returning to the condenser. |
| T6 | Temperature Sensor of Supply Water to Heating System | Measures water temperature supplied to the heating system. |
| T7 | Temperature Sensor of Return Water from Heating System | Measures water temperature returning from the heating system. |
| T8 | Domestic Hot Water Temperature Sensor | Measures the temperature of the domestic hot water. |
| TG1 | Water Heater Mixing Valve Actuator for Ventilation Unit | Controls a mixing valve for water heating in a ventilation unit. |
| TK | Electric Heater Thermal Protection | Safety device for the electric heater. |
| U1 | Supply Air Fan Pressure Drop Sensor | Measures pressure difference across the supply air fan. |
| U2 | Extract Air Fan Pressure Drop Sensor | Measures pressure difference across the extract air fan. |
| V1 | Supply Air Fan | Moves supply air into the conditioned space. |
| V2 | Extract Air Fan | Moves extract air out of the conditioned space. |
| V3 | Heat Pump Fan | Moves air across the heat pump's outdoor coil. |
| VDM1 | Water Flowmeter | Measures the flow rate of water. |
| VS1 | Heating System Valve Actuator | Controls a valve in the heating system. |
| VS2 | Domestic Water Heating Valve Actuator | Controls a valve for domestic hot water heating. |
Diagrammatic Description
The functional diagram illustrates the interconnectedness of the system's components:
- Airflow Path: Outdoor air (ODA) is drawn in, filtered (F1, F3), and conditioned. It passes through a heat pump fan (V3) and potentially a water air heater (10). Supply air (SUP) is delivered, while extract air (ETA) is removed and potentially processed by a rotary heat exchanger (DR 200). Exhaust air (EHA) is expelled. Pressure drop sensors (P1, U1, U2) monitor airflow.
- Heat Pump Circuit: The core heat pump circuit includes the compressor (KM1), heat exchangers (1, 2), liquid receiver (4), filter-dryer (5), and expansion valves (EXV1, EXV2). Sensors (T1, T2, T3, DT1, HPT1, LPT1) and a 4-way valve (SVR) manage refrigerant flow and system state, including defrost cycles (SVD1).
- Hydronic Heating Circuit: Water is circulated by a pump (S2) through the heating system. An expansion vessel (14) manages pressure. Temperature sensors (T6, T7) monitor supply and return water temperatures. Shut-off valves (13) and safety valves (18, 19) are present. A valve actuator (VS1) controls flow.
- Domestic Hot Water (DHW) Circuit: Cold water (4) enters the system and is heated, stored in the DHW tank (16). An expansion vessel (15) is included. A DHW circulation pump (S4) may operate for recirculation. Temperature sensor (T8) monitors DHW temperature. A valve actuator (VS2) controls heating for DHW.
- Auxiliary Heating: An electric heater (EH) is integrated, with thermal protection (TK), likely for backup heating.
- Control Systems: Various controller boards (RG1, RG2, RG3) manage the overall operation of the system, integrating inputs from numerous sensors and controlling actuators and components.
