Cetetherm Mini Plus CM737
Installation, service and operating instruction
34
Reason
Action
The heating control equipment may
need to be adjusted
Check and adjust the heating curve
See
9.2 Category 1 parameters: Control panel
and change
the selected heating curve with parameter 15 category 1.
If needed the set heating curve can be fine-tuned. Increase/
decrease the room temperature to parallel adjust the heating
curve.
Also see section
Heating valve and actuator does not
work
See
16.2 Check the heating actuator and valve function
15.2.2 No heating
Reason
Action
Circulation pump not running
Check that the electrical power is o
n
Check the heating circulation pump
If the pump fails to start after stopping, try to start it at the highest
setting.
If a UPM3 pump see
Check the heating parameters in operator control panel
Summer reduction, parameter 2, category 2: If measured outdoor
temperature is higher than target temperature, the pump should
not be operating.
Economy function, parameter 3, category 2:
If the calculated water supply temperature is not greater than the
outside temperature by this amount the heating will switch off.
If parameter 3 is 0, the pump operation will not be affected by this
parameter.
The pressure in the system is to low or
there is not enough water in the heating
system
Check the pressure on the manometer and top up the system
with water
The pressure should not be below 1.0 Bar in winter time or below
0.6 Bar in summer. The circuit should only be topped up with fresh
water when necessary. The water used for topping up contains
oxygen which can lead to corrosion in the system. The circuit
should therefore be topped up as seldom as possible. Fill up by
opening the top up valves until the pressure meter shows desired
value, or up to maximum 2.0 Bar.
Then close the top up valve.
The safety valve opening pressure is 2.5 Bar.
