LK Armatur ThermoMat G Manuel D'instruction page 3

GB ENGLISH
Mounting
The valve unit is mounted upright either on the right- or left-hand
side of the heating boiler. The thermometers are pressed onto the
front side of the unit.
For a trouble free system the piping work must be done without air
pockets. If this is not possible the system must be fi tted with air vents.
Several boilers have integrated thermostats for pump control. If
not, a fl ue gas thermostat must be installed. The circulation pump
should start at the same time as the fi ring. The pump should stop
soon after the fi 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 G loading unit with Rp 1" ball valves.
For heating boilers up to 45 kW ..... DN 25
• LK 810 ThermoMat G loading unit with 28 mm ball valves.
For heating boilers up to 45 kW .... DN 28
• LK 810 ThermoMat G loading unit with Rp 1¼" ball valves.
For heating boilers up to 90 kW .... DN 32
Circulating pump
Three 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.
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.
Function of the backflow preventer
LK 810 ThermoMat G loading unit has, depending on model, a
backfl ow preventer which automatically opens for selfcirculation
when the pump stops. The backfl ow preventer has the following
functions:
1. After the fi 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 backfl ow from storage tank to heating boiler.
The function of the backfl ow preventer can, if needed, be blocked.
The backfl ow preventer is then replaced by a plug LKA art.no:
187 022. See page 14-15, part 13.
Function
1. Heat up phase
The water circulates between boiler and
loading 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 bypass is closed. This results in an opti-
mal transfer of heat from the boiler and the
storage tank is fi lled with supply water.
4. Self-circulation with check valve
Self-circulation will be obtained as soon
as the fi re has gone out and the circulating
pump has stopped. The remaining hot wa-
ter 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.