M thermal Mono
202005 49
Part 3 - Installation and Field Settings
6 Internal Circulation Pump Speed Settings
The internal circulation pump speed can be selected by adjusting the red knob on the pump. The default factory setting
is the highest speed (III). If the system water flow is too high, the pump speed can be set to medium (II) or low (I). The
relationship between external static pressure and water flow rate is described in Part 2, 7 “Hydronic Performance”.
Figure 3-6.1: Internal circulation pump
Figure 3-6.2: Faults with external interference sources
Pump is not running although the
power supply is switched on.
Electrical fuse defective.
Restore power after interruption.
Cavitation due to insufficient
suction pressure.
Increase the system suction pressure
within the permissible range.
Check the delivery head setting and set to
lower head if necessary.
Fault signals
- The fault signal is indicated by the LED display .
- The fault signal LED is continuously illuminated in red .
- The pump switches off (depending on the error code), and attempts a cyclical restart.( Specially, for Error code
E10 (blocking): After approx. 10 minutes, the pump switches off permanently and displays the error code.)
Figure 3-6.3: Fault signals
Power supply too low on mains side
Power supply too high on mains
side
The pump is driven in reverse (the
fluid flows through the pump from
the pressure to the suction side)
Check flow, install non-return valves if
necessary
Improve room ventilation, check
operating conditions, request
customer service, if necessary
Ambient temperature too high
Improve room ventilation, check
operating conditions, request
customer service, if necessary
* In addition to the LED display, the fault signal LED is continuously illuminated in red.
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