3
GB
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 backflow preventer which automatically opens for self-
circulation when the pump stops. The backflow preventer has the
following functions:
1. After the fire 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 backflow from storage tank to heating boiler.
The function of the backflow preventer can, if needed, be blocked.
The backflow preventer is then replaced by a plug LKA art.no:
187 022. See page 9, part 8.
MOUNTING
For a trouble free system the piping work must be done without
air pockets. If this is not possible the system must be fitted with air
vents.
Several boilers have integrated thermostats for pump control.
If not, a flue gas thermostat must be installed. The circulation
pump should start at the same time as the firing. The pump
should stop soon after the fire 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 STORA-
GE TANK:
• LK 810 ThermoMat 2.0 G Eco loading unit with Rp 1” ball
valves. For heating boilers up to 40 kW ….. DN 25
• LK 810 ThermoMat 2.0 G Eco loading unit with 28 mm ball
valves. For heating boilers up to 40 kW …. CU 28
• 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
Max. boiler efficiency 65 kW at 20°C ΔT
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. Heat up phase
The water circulates between boiler and lo-
ading unit while the temperature of the boiler
is rising.
2. Loading phase
The thermostatic element starts to open and
allows return water from the storage tank to be
mixed with supply water before it returns to the
boiler. The return temperature to the boiler is kept
constant.
3. End phase
The thermostatic element is fully open and the by-
pass is closed. This results in an optimal transfer
of heat from the boiler and the storage tank is
filled with supply water.
4. Self-circulation with check valve
Self-circulation will be obtained as soon as the
fire has gone out and the circulating pump has
stopped. The remaining hot water is loaded to the
storage tank. In case of power failure or pump
breakdown the check valve automatically opens
to allow self-circulation. The check valve also
stops recirculation from storage tank to boiler.
FUNCTION
youtube.com/lkarmatur
10
11
Min./Max.
2 °C / +110 °C
Max. 1.0 MPa
(10 bar)
75 °C
95 °C
110 °C
0.005 MPa 0.05 MPa
0.108 MPa
0.05 bar
0.5 bar
1.08 bar
Max. 95% RH
IP44
Min./Max.
0 °C / +70 °C
< 43 dB(A)
10
11
Min./Max.
2 °C / +110 °C
Max. 1.0 MPa
(10 bar)
75 °C
95 °C
110 °C
0.005 MPa 0.05 MPa
0.108 MPa
0.05 bar
0.5 bar
1.08 bar
Max. 95% RH
IP44
Min./Max.
0 °C / +70 °C
< 43 dB(A)
