Laddomat 21-60 Operating instructions

1
Laddomat®21-60 Charging unit
User and installation instructions
LM21-60_Manual_E.indd
81260002-E
090810
The Laddomat 21-60 is designed to...
...allow the boiler to reach a high working temperature soon
after firing.
...to heat the cold tank water in the bottom of the boiler so
that the boiler does not rust away through condensation.
…charge the tank with water at a high and even
temperature and low flow, to ensure optimal layering in the
tank.
…transfer the residual heat in the boiler to the tank after
the fire has gone out.
…in the event of electrical power failure stopping the
pump, transfer the heat in the boiler to the tank through
self-circulation.
Operation
Laddomat 21-60 functions fully automatically provided
that pump start and stop is automated. See page 3.
The settings described in this User manual are normally
made only once.
The Laddomat requires no special supervision or service.
Technical data
Pump: Laddomat LM6 (standard)
Connection: 3 x Cu28 with lever (standard)
Opening temperature: 72° (standard).
63°, 78° or 83°C on special order
Boiler output: max 60 kW
NOTE! Diagrams in this brochure only describe connection
principles. Each installation must be measured and carried
out according to the applicable regulations.
[phone] www.termoventiler.se

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Description of functions
Operating phase
Start up
Final phase Self-circulation
Connection to
bottom of boiler
Connection to
bottom of tank
Connection to
top of boiler

3
Starting and stopping the charging
pump
The speed control on the
circulation pump must be in
position 3.
NOTE! Check that the
control is not at the lowest
speed or a neutral position
because this can prevent the
pump from starting.
The pump can be started by
a flue thermostat. If extra
safety is required, a water
thermostat can be connected
in parallel. See image to the
right.
Expansion vessel
The expansion vessel must be sufficiently large, at least
5–10% of the total volume when the tank is open. Opera-
ting pressure must always be at least 2 metre water pillar =
0.2 bar more than the height difference from the pressure
gauge to the upper edge of the highest radiator.
If a pressure vessel is installed, this must be at least 10–20%
of the total volume. Each installation must be specially
dimensioned in accordance with the manufacturer’s
instructions.
Check that the operating pressure, where the installation
is cold, is never lower than the height difference between
the pressure gauge and the highest radiator + 2 metre water
pillar (mwp).
Radiator system
To make the maximum use of the storage tank, it is very
important that the radiator system is fitted with:
1. Automatic by-pass control with flow sensor and room
sensor is ideal for this purpose, thanks to its ability to sense
the heating needs of the house rapidly. The autmatic by-
pass control always matches heat output exactly to
requirements.
2. Thermostatic valves with integrated pressure reduction
devices, which are set to suit the radiator size.
Both measures are intended to reduce the flow and so
reduce the return temperature, without raising the delivery
temperature. The lower the return temperature, the longer
the heat in the tank lasts.
Dimensioning
Generous pipe dimensions and short lengths guarantee
operating reliability, even when the demand for heat is
high. This also allows effective self-circulation in the event
of power failure.
Recommended pipe dimensions at a maximum boiler to
tank distance of 2 m. Total length would then be 2 + 2 m
+ 6 bends. 1 bend is equivalent to 1 m pipe length.
Table 1:
Boiler with max output* up to:
80 kW min. 35 Cu pipe or R32
100 kW min. 42 Cu pipe or R40
120 kW min. 54 Cu pipe or R50
Flow:
At the above pipe dimensions, Laddomat 21-60 gives
2 – 3 m³/h. See flow diagram below.
The dimensions must be increased for longer distances.
The maximum distance between boiler and tank is 6 m.
Total length would then be 6 + 6 m + 6 bends.
If there are special requirements for self-circulation, the
pipes must be dimensioned accordingly.
*Boiler output:
There is a difference between the nominal output and the
maximum output of a boiler. The maximum output can
be as much as 30-50% higher than the boiler’s nominal
output.
Example: If the boiler’s nominal output is 40 kW, the max
output can reach up to 60 kW.
This is very important to include in the calculation when
dimensioning the system.
Connection
Laddomat 21-60 must always be connected in the upright
position as shown in the diagrams.
Place Laddomat 21-60 near the boiler and at the level of
the boiler’s bottom output.
Pipe-runs must be as short as possible and have the
minimum number of bends. Make sure that all air pockets
are eliminated.
The diameter of the pipe from the top of the boiler to
the T-pipe and down to the Laddomat 21-60 must be as
large as possible. This gives low water-velocity, and allows
air released in the boiler to separate out in the expansion
chamber or the vent.

4
The pipe to the
bottom of the tank
must not be routed
through the roof.
This connection
removes the self-
circulation function.
NOTE If the radiator
is connected in
this way there
is a large risk of
heat retention in
the boiler and/or
reduced heat to the
radiator circuit.
Connecting to a tank
1. The pipe-runs shown on the diagram are optimised to
minimise air-related operating interruptions.
2. The hot water pipe to the by-pass valve can be
connected in two ways.
A. Approx 30 cm from the top of the tank to prioritise
domestic hot water.
B. On the charge line connection to the tank to
prioritise heating. The connection is directed down-
wards to prevent air rising to the radiators.
Connecting 2 tanks
The tanks must be located up against each other, and as
close as possible to the boiler. The pipe-runs from the bot-
tom of the tanks are always laid close to the floor.
It is important that the flow to the tanks during charging
and discharging is distributed equally. If the system is
connected incorrectly, then charging will be cut off when
tank 1 is full of hot water which will reach the boiler before
the other tanks are completely filled. Tank 2 will be
virtually unused.
If the system is connected incorrectly, the warm water and
the heat will run out earlier than estimated after the burner
has stopped, since tank 1 will cool down more quickly than
the other.
If these requirements cannot be met, there are other
connection options.
Equal pipe lengths
To achieve equal resistance, it is essential to use
approximately the same pipe-lengths to the tanks, this is
achieved by:
1. Connecting the charging circuit diagonally, A–A.
2. Connecting the radiator circuit diagonally, B–B.
In addition, the dimension of the pipes between the tanks
must be large enough to facilitate self-circulation between
the tanks. It is an advantage if the tanks are connected
together in the centre, to further distribute the heat.
Connecting the by-pass valve
The hot water port is connected at B, which prioritises hot
water, or at B1, which prioritises heating.
Electrical immersion heater operation
When operating solely on the electrical immersion heater,
it is an advantage only to heat the first tank to prevent heat
loss. Shut off the other tank using the valve at the bottom
of the tank.
Laddomat 21-60 can
easily be reversed for
right-hand mounting.
Just move the
thermometers to the other
side.

5
NOTE See information on page 3 about the expansion vessel
Connection suggestions
Bottom connection of the expansion vessel
gives reduced heat losses.
Alternative installation with open
expansion vessel

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