4
x
Operation
21
BA ROTEX A1 BO - 10/2007
• Find the hydraulic resistance of the heating network in the piping network calculation for your heating system.
• Using fig. 4-6, determine the required heating level of your heating pump.
• Set the pump to the required output level (fig. 4-7).
Example for determination of the pump output level
– Heat requirement: 13 kW, design temperatures: 75/60 °C, Spread: 15 K, required flow rate: 700 l/m, hydraulic resistance in
heating network: 240 mbar.
Î
In the design case, pump level 2 will be adequate.
4.2.2 Information on operating noises
In some cases, the resonance in the flue system can amplify the noise at the mouth of the flue gas pipe. The noise level can be
effectively reduced by using a noise damper (
15 45 78
).
Air suction noises are generated during ambient air-dependent operation. The noise level can be effectively reduced by using
a noise damper (
15 45 77
).
4.3
Temporary shutdown
If no heating and no hot water supply is needed over a long period, the oil condensing boiler can be temporarily shut down. ROTEX,
however, recommends putting the system on Standby mode (see Documentation "ROTEX Control"). The heating system is then
protected from frost. The pumps and valve protection functions are active.
If it is not possible to guarantee the oil and power supply when there is danger of frost,
– the oil condensing boiler must be drained,
– the condensate treatment unit must be drained (see chapter 5.2).
– suitable antifreeze measures must be taken for the connected heating system and hot water storage tank (e.g. draining).
In practice, the hydraulic resistance in the heating network is often not known. By observing the flow and return
flow temperatures on the heat generator, you can determine whether the pump would still provide adequate
output at a lower speed level.
The difference between the flow and return flow temperature must not be greater than the design spread and
each room must still get warm enough.
1
Heating pump
2
Setting lever of the pump output level
Fig. 4-7
Setting the pump output level
2
1
CAUTION!
A heating system which is shut down can freeze in the event of frost and may suffer damage.
• Drain the heating system that is shut down if there is danger of frost.
• If the heating system is not drained and there is the risk of frost, the oil and power supplies must be secured
and the main switch must remain switched on.
