4
x
Operation
22
BA ROTEX GSU - 09/2007
4.2
Heating mode
In the normal mode, the boiler temperature control always works in an automatic or continuous operation mode. The boiler
temperature is controlled irrespective of the weather.
4.2.1 Manual setting of the boiler temperature
You can operate the ROTEX GSU in the manual mode for manual heating of the heating system or for temporary manual setting
if the boiler temperature.
• Switching on the mains switch. Wait for the start phase.
•
Set the operating temperature for manual mode. To do this actuate the manual key for
about 5 seconds
and set the
operating temperature on the rotary knob.
•
Set the rotary switch I to position
. Press
and
simultaneously.
4.2.2 Pump setting for energy-saving operation
The 25 kW versions of the ROTEX GasSolarUnit are fitted with a three-stage pump, normally having sufficient output to supply
the complete heating system. Additional pumps are needed only if mixed heating circuits are installed.
Depending on the heat requirement and design temperatures of the heating system, the pump can also be operated at a
reduced
speed
, without having to restrict the heat supply. You can economise on the pump power in this way. The pump fitted in the
ROTEX GSU consumes only about 75-80 W in output stage 3, about 55-60 W in output stage 2 and only about 40 W in output
stage 1.
Determining the pump stage needed
• Determine the throughput quantity needed for a certain heat output depending upon the design scatter from the heat output
chart (Fig 4-5).
press for approx. 5 s
Target temperature
Current actual value
Modify
Desired
setpoint (flashing)
Return to original operating mode, basic display,
specified setpoint is saved
Figure 4-4 Manual operation for THETA 23R (adjust temperature of heater)
Q
Heating output
m
H
Flow rate
Figure 4-5 Heat output chart
The design scatter describes the temperature difference between the heat flow and heat return flow under the
design conditions (as a rule -12 °C outdoor air temperature).
q
a
Summary of Contents for GSU 320
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Page 46: ...Notes 46 BA ROTEX GSU 09 2007...
