Commissioning; Filling The Dhw Cylinder And Checking For Leaks; District Heating - Buderus Logalux LTN Series Installation Instructions For Contractors

6

Commissioning

6 Commissioning
Initial commissioning must be carried out by a contractor.
DANGER: Danger to life through electrical shock!
▶ Protect all electrical connections and cables against
contact!
NOTICE: Operate a DHW cylinder with immersion heater
and external current anode only with a 30 mA fault current
switch!
When commissioning, observe the operating instructions
for the floor-standing boiler and DHW cylinder.
In addition to operation with district heating, the LTN/LTH/
LTD cylinders can be heated with immersion heaters and
floor-standing boilers, while the LF cylinders can be heated
via external heat exchangers. Observe the documents for
the relevant heat source.
6.1

Filling the DHW cylinder and checking for leaks

▶ Before commissioning, check all pipework connections and screw
fittings for leaks.
▶ After the cylinder has heated up and due to the associated pressure
rise, tighten the screws in the manhole cover by hand.
6.2

District heating

▶ Adjust the pump in a cylinder combination to the pump rate
corresponding to the continuous DHW output.
▶ Make this adjustment via an adjusting valve downstream of the
pump.
▶ If the adjustment is made at minimum flow temperature (summer
mode), open the temperature control valve fully (highest set value
setting on the thermostat).
▶ While making the adjustment, open the draw-off positions; the total
discharge volume must not however exceed the maximum DHW
output.
▶ Open the draw-off positions.
▶ Open the DHW shut-off valve [3].
▶ Adjust the discharge volume according to the continuous DHW
output.
▶ Mark the valve spindle position on the adjusting valve [5].
▶ Close the DHW shut-off valve [3].
▶ Heat the domestic hot water temperature in the stratification
cylinder up to 50 °C.
▶ Close the adjusting valve [5] to 50...70 %.
▶ Switch on the pump [6].
▶ Open the DHW shut-off valve [3] to the factory default.
▶ Measure the discharge volume.
▶ Adjust the temperature control valve [4] to its highest set value.
▶ Measure the domestic hot water temperature at the DHW outlet or
draw-off positions.
20
▶ If the domestic hot water temperature drops (< 50 °C), close the
adjusting valve [5].
▶ If the domestic hot water temperature rises (> 50 °C), open the
adjusting valve [5].
▶ When the outlet temperature is constant, mark the valve spindle of
the adjusting valve [5].
▶ Adjust the set value for the domestic hot water temperature, e.g.
50 °C, at the temperature control valve [4].
▶ Close the draw-off positions.
Fig. 37 DHW cylinder connection diagram
[1] Sensor pocket for return temperature limiter
[2] Sensor pocket for thermometer - domestic hot water
temperature
[3] DHW shut-off valve
[4] Temperature control valve without auxiliary energy
[5] Adjusting valve
[6] Pump
Logalux LTN/LTD/LTH/LF 400...3000 – 6 720 818 806 (2015/12)
6 720 817 906-15.1T