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Function of the backflow preventer
LK 810 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 stopped 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 14-15, part 13.
Function
1. Heat up phase
The boiler water is circulating to
the loading unit and back 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 back
to the boiler. The return tempera-
ture to the boiler is constant.
Replacing Thermostatic Elements
- Turn off the pump
- Close the three ball valves
- Screw off the upper ball valve from the loading unit
- Loosen the two remaining ball valves
- Tilt the loading unit forwards
- Unscrew the element housing
- Replace the thermostatic element
After replacing the element, open the three ball valves and start the
pump. Check that there is no air in the system.
Boiler
Position Consumption Flow
Capacity
40 kW
Pos. |
10 W
65 kW
Pos. ||
35 W
75 kW
Pos. |||
45 W
30 kW
Pos. |
10 W
55kW
Pos. ||
35 W
65 kW
Pos. |||
45 W
25 kW
Pos. |
10 W
40 kW
Pos. ||
35 W
50 kW
Pos. |||
45 W
15 kW
Pos. |
10 W
30 kW
Pos. ||
35 W
35 kW
Pos. |||
45 W
LK 810 ECO Loading Unit | Mounting and Operating Instructions
Return
Boiler
temperature
Temperature
1200 l/h
55° C
85° C
2000 l/h
55° C
85° C
2300 l/h
55° C
85° C
1200 l/h
60° C
85° C
2000 l/h
60° C
85° C
2300 l/h
60° C
85° C
1200 l/h
65° C
85° C
2000 l/h
65° C
85° C
2300 l/h
65° C
85° C
1200 l/h
70° C
85° C
2000 l/h
70° C
85° C
2300 l/h
70°C
85° C
3. End phase
The thermostat element is fully open.
The balancing valve is closed.
This results a maximum cooling of the
heating boiler and the storage tank is
fully filled with supply water..
4. Self-circulation with a backflow
preventer
Self-circulation is obtained as soon as
the fire and the circulating pump have
stopped. The remaining hot water
self-circulates to the storage tank.
In case of power or pump failure the
backflow preventer automatically
opens for self-circulation.
The backflow preventer stops the self-
circulation from tank to boiler.
Circulating pump
Three pump positions are availa-
ble depending on boiler capacity.
It is to be noted that the maximum
capacity of a boiler may be higher
than its nominal capacity.
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