Thermic Loading Valve

LK 820 ThermoVar®

• Position-independent

TECHNICAL DATA

Max. working pressure

1.0 MPa (10 bar)

Max. differential pressure

50 kPa (0,5 bar)

Working temperature

(45 - 55 °C) Min. 5 °C/Max. 95 °C

(61 - 80 °C) Min. 5 °C/Max. 110 °C

Opening temperature

45 °C, 55 °C, 61 °C, 66 °C, 72 °C

or 80 °C

Ambient temperature

Min. 5 °C/Max. 60 °C

Thread standard

Rp - female thread,

G - male thread

Media

Water - Glycol mixture max. 50%

Material valve body

Brass EN 12165 CW617N

Material external cover

Brass EN 12165 CW617N

M 2” - Coated Aluminium

Material sealing

EPDM

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 pre-

vented 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.

The valve can be mounted at any angle. LK 820 ThermoVar®

can easily be adapted for right- or left-hand mounting. The

valve can be installed in three different positions. In the stand-

ard 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 break-

down 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 circu-

lates 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 circu-

lates 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 break-

down 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.

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