Thermic Valves and Check Valves | LK 820 ThermoVar Technical Data 32 Registered Design LK 820 ThermoVar LK 820 ThermoVar is a 3-way thermic loading valve for solid fuel/storage tank installations. The valve is intended to ensure both an optimal temperature stratification in the storage tank and a high return temperature to the boiler, thus incresasing the efficiency of the system. Tarring and condensation are prevented which prolongs boiler life. LK 820 can be equipped with an insulation - see under Accessories. For more information, please see the product sheet for insulations page 49. The valve can be mounted at any angle. LK 820 Thermo- Var can easily be adapted for right- or left-hand mounting. The valve can be installed in three different positions. In the standard version the valve is intended for installation in position II. It can easily be adapted for installation in position I. For delivery of valves intended for installation in position III, please contact our Sales Department. Position I As soon as the boiler temperature has reached the selected opening temperature, the thermic valve allows hot water to load to the storage tank. Return water from the storage tank is mixed with supply water before it circulates back into the boiler. The loading temperature is at least the selected opening temperature. A balancing valve should be installed in the circuit between boiler and loading valve. The installation should be equipped with an LK 822 ThermoBac check valve to prevent self-circulation from storage tank to boiler after the fire has gone out. In case of power failure or pump breakdown the check valve automatically opens for self-circulation. The circulating pump should be controlled by a thermostat that measures the boiler’s water or flue gas temperature. Position II As soon as the boiler temperature has reached the selected opening temperature, the thermic valve allows return water from the storage tank to mix with supply water before it circulates back into the boiler. The return temperature is at least the selected opening temperature. A balancing valve should be installed in the circuit between boiler and loading valve. The circulating pump should be controlled by a thermostat that measures the boiler’s water or flue gas temperature. Position III As soon as the boiler temperature has reached the selected opening temperature, the thermic valve allows return water from the storage tank to mix with supply water before it circulates back into the boiler. The return temperature is at least the selected opening temperature. A balancing valve should be installed in the circuit between boiler and loading valve. The installation should be equipped with an LK 822 ThermoBac check valve to prevent self-circulation from storage tank to boiler after the fire has gone out. In case of power failure or pump breakdown the check valve opens automatically for self-circulation. The circulating pump should be controlled by a thermostat that measures the boiler’s water or flue gas temperature. Opening temperature 45°C, 55°C, 61°C, 66°C, 72°C or 80°C Working temperature 45°C-55°C Min. +5°C Max. +95°C 61°C-80°C Min. +5°C/Max. +110°C Ambient temperature Min. +5°C/Max. +60°C Max. working pressure 1.0 MPa (10 bar) Max. differential pressure 50 kPa Media Water - Glycol mixture max. 50% Thread standard Rp - female thread, G - male thread Material, valve body Brass EN 12165 CW617N Material, cover Brass EN 12165 CW617N Material, sealing EPDM
LK Armatur - Produktkatalog 2014 ENG
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