6
Thermostat cartridge
The thermostat cartridge is available as a spare part, and
may need to be replaced more often if it is regularly exposed
to temperatures close to, or above, boiling point.
The number is engraved on the cartridge.
No. Opening
temperature
5839 63°C
8719
72°C
1456
78°C
1467 83°C
Service
Before carrying out any servicing work, close the three shut-
offs by turning the lever on the valves at right angles to the
direction of the pipe. This makes it easy to access the pump,
thermal valve and check valve for service.
If operating interruptions still occur, even though the
system has been bled, there may be dirt such as lint, tape or
thread swarf stuck in the coupling. Disassemble and clean.
Clean all sealing surfaces when reassembling:
1. The thermal valve
2. The self-circulation valve
3. The pump impeller
In some installations, there are problems with extremely
high levels of contaminants. These can form deposits inside
the pump, which may result in stoppages.
Instructions for replacing the
thermostat in Laddomat 21-60
Check that the pump is switched off.
Close the three shut-offs.
Unscrew the cover opposite the pump.
Remove the cover with the spring, plunger and thermostat
from Laddomat 21-60.
The thermostat is held in place on the plunger by an O-
ring. Detach the thermostat from the plunger carefully
using a screwdriver (see image on right).
Push the new thermostat into the plunger.
Reinstall the cover with the spring, plunger and thermostat.
Open the shut-off valves.
Wait a few minutes before starting the pump to allow any
air to rise and escape from the system.
The installation is now ready for use.
Blocking the check valve
If you, for some reason, want to completely shut off the self
circulation function, the check valve must be blocked.
Use the blocking clip, placed at the bottom of the EPP-
insulation (Picture 3), to block the check valve.
The clip is then fastened around the check valve axis ac-
cording to picture 5.
To reach the axis, the spring needs to be removed.
Picture 2
Picture 1
Picture 4
Picture 5
Picture 3
The blocking clip is
mounted here.
Blocking
clip
