Remeha Selecta
34
7.2.5 Frost
protection
The boiler needs to be positioned in a frost-free room to prevent the condensate drain
pipe freezing.
This boilers frost protection automatically turns the boiler on if the temperature drops
below a certain level. (explained in more detail below).
If the temperature of the water in the
boiler
drops too low, the built-in boiler protection
becomes active. It works as follows; if the water temperature:
- is lower than 7°C, the circulation pump is activated
- is below 3°C, the boiler is activated
- higher than 10°C, the boiler is switched off and the circulation pump post-circulates
for 15 min.
Attention:
This is a protection facility for the boiler and pipework only and not for the
installation.
In rooms subject to frost hazard (eg conservatories) it is advisable to install a frost
thermostat and connect it in parallel with the room thermostat to terminals 2 and 3 of
the terminal connector X 4,
see Fig. 16
. When the frost thermostat becomes active,
the boiler goes into operation with the programmed maximum flow temperature as its
limit.
7.2.6 Boiler temperature control
The Remeha Selecta is equipped with an electronic temperature control which oper-
ates on the basis of flow and return temperature sensors. The flow temperature is
factory set to 80°C and should not be changed without reference to the system design
Engineer,
see Par. 9.3
(works setting 80°C).
7.2.7 Low water level protection
The Remeha Selecta is equipped with low water level and flow protection based on
temperature difference between flow and return.
By modulating back the moment the water flow threatens to become too low, the
appliance remains in operation for as long as possible. In case of too low a flow the
appliance goes into temporary shutdown mode rather than failure or “lock-out”.
7.2.8 Maximum protection (over heat thermostat)
The over heat thermostat locks out the appliance in case of a excessive water tem-
perature (110°C). After rectifying the cause of the failure, the appliance can be reset by
using the
‘reset’ -
key.
