Side Control Unit Holder - Bosch UT-L 1 Technical Manual

be fitted with an actuator and controlled by the
CFB control unit.
– Control of a separate actuator:
If the operating flow temperature of the boiler is
not reached, the actuator (3-way mixer) is closed.
This setting is advisable when supplying heat to
externally controlled heating circuits or for heating
circuits without actuator.
– Relevant function of a third party control unit:
Condition: during burner mode, an operating flow
temperature of 50 °C must be reached within 10
minutes and maintained as the minimum
temperature, e.g. by limiting the flow rate.
Boiler with minimum return temperature
• For this boiler type, a factory-set minimum return
temperature for the boiler is ensured. If this minimum
return temperature (captured at the return
temperature sensor FR or in multi boiler systems at
the strategy return temperature sensor FRS), the flow
rate is automatically reduced via actuators. To
support this control function, the boiler circuit pump,
heating circuit pumps and cylinder primary pumps are
shut down if high load conditions suddenly occur.
The following options are possible for controlling the
minimum return temperature:
– Overriding control of the heating circuit actuators:
The heating circuit actuators are closed if the
minimum return temperature is not reached,
independent of the heat demand of the heating
circuits. For this setting, all heating circuits must
be fitted with an actuator and controlled by the
CFB control unit.
– Control of a separate actuator:
If the minimum return temperature of the boiler
(sensor FR) is not reached, the actuator (3-way
mixer) is closed. This setting is advisable when
supplying heat to externally controlled heating
circuits or for heating circuits without actuator.
7.3

Side control unit holder

For UNIMAT UT-L boilers, in conjunction with CFB
control units, the side control unit holder is required as
an accessory. It enables convenient operation of the CFB
810, CFB 910 and CFB 930 control units at eye level. The
side holder can be fitted on the right hand or left hand
side of the boiler block. Mount the control unit on an
adaptor plate on the side control unit holder ( Fig. 27).
To install the CFB 810, CFB 910 and CFB 30 control
units, the following additional equipment will be
required:
• Burner cable
• Sensor well
UNIMAT
Boiler control and control system | 45
Fig. 27 Side control unit holder for UNIMAT UT-L
(example illustration)
[1] Side control unit holder
1
6 720 803 977-27.1itl
6 720 807 794 (2013/04)