System examples | 59
6 720 807 794 (2013/04)UNIMAT
9.6 1-boiler system with UNIMAT UT-L boiler: boiler circuit control unit
Fig. 40 System example with boiler circuit control unit (list of abbreviations
page 47)
[
1)
] Enabling (potential-free)
Burner stage I
Burner stage II or modulation
AREA OF APPLICATION
•UNIMATUT-L boiler
• boiler circuit control unit
– Maintaining the operating conditions
– Enabling of burner stages
Brief description of the system
• Minimum return temperature controlled via a
separate actuator in the boiler circuit and a boiler
circuit pump as shunt pump
• 2-stage or modulating burner mode
• Control of heating circuit using CFB control unit or on-
site control unit
Function description
To control the return temperature, the 3-way valve is
actuated, as is the boiler circuit pump which is installed
in the bypass line to the boiler. The return temperature
sensor measures the boiler return temperature. If this
falls below the set value, the flow rate to the return is
constantly restricted and the bypass from the heating
return to the heating flow is opened. The heating circuit
flow rate remains almost constant even during this
operating phase. The boiler circuit pump safeguards the
optimum flow rate in the boiler circuit.
Special design information
• If a check valve is installed, the boiler circuit pump
run-on time should be five minutes. If no check valve
is installed, set a run-on time of 60 minutes.
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