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EN ENGLISH
Circulating pump
Four pump positions are available depending on boiler capacity.
It is to be noted that the maximum capacity of a boiler may be
higher than its nominal capacity.
Function of the backflow preventer
LK 810 ThermoMat 2.0 G Eco loading unit has, depending on
model, a backow preventer which automatically opens for self-
circulation when the pump stops. The backow preventer has the
following functions:
1. After the re has gone out and the circulating pump has stop-
ped the remaining hot water will selfcirculate to the storage tank.
2. In case of power failure the hot water will self-circulate to
the tank.
3. It prevents backow from storage tank to heating boiler.
The function of the backow preventer can, if needed, be blocked.
The backow preventer is then replaced by a plug LKA art.no:
187 022. See page 5, part 6.
Mounting
For a trouble free system the piping work must be done without air
pockets. If this is not possible the system must be tted with air vents.
Several boilers have integrated thermostats for pump control. If
not, a ue gas thermostat must be installed. The circulation pump
should start at the same time as the ring. The pump should stop
soon after the re has gone out to let the remaining hot water in
the boiler self-circulate to the storage tank.
Dimensioning
Pipe dimensioning between heating boiler and storage tank:
• LK 810 ThermoMat 2.0 G Eco loading unit with Rp 1¼“ ball
valves. For heating boilers up to 65 kW …. DN 32
Technical Data
Voltage 230 VAC 50 Hz
Power consumption Max. 52 W
Return temperature 55°C, 60°C, 65°C or 70°C
Working temperature Min. +5°C/Max. +110°C
Ambient temp. Min. +5°C/Max. +70°C
Max. working pressure 1,0 MPa (10 bar)
Media Water - Glycol mixture max. 50%
Thread standard Rp - female thread
Circulating pump Grundfos UPM3 AUTO L xx-70
Material, valve body Brass EN 1982 CB753S
Material, insulation Expanded Polypropylene EPP
1. Firing
During cold firing, when the return water tem-
perature is below the LK 810 nominal temperature,
the return line is closed by the thermostatic valve.
Heating water circulates to the thermostatic valve
via bypass and back to the boiler.
2. Loading phase
As soon as the nominal temperature is reached, the
thermostatic valve starts opening the return line so
that a constant nominal temperature is reached for
return water by mixing it with water circulating via
bypass.
3. Operation
As soon as the return water reaches its nominal value,
the thermostatic valve opens the return line com-
pletely and closes bypass.
4. Gravity circulation
In case of a power supply or circulation pump failure
the check valve opens and makes possible gravity cir-
culation of heating water.
Function
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