Logamatic EMS RC35 user interface - Subject to technical modifications. 35
Entering system settings (Service menu – Settings)
6
• shut-down mode: The boiler and the heating zone pump are switched off, and frost protection
is activated. The heating zone pump runs only for purposes of frost protection. Not recommended
if there is a risk that the building could cool down too much.
• Room setback mode: If the room temperature falls below the set night temperature (the target
value), the heating system will operate in the same way as for reduced heating operation (as
described under reduction mode “setback mode”). If the room temperature exceeds the target
night temperature by more than 2 °F (1 °C), the boiler and the heating zone pump are switched
off (as described under reduction mode “shut-down mode”). This reduction mode is only possible
if a remote control unit has been installed in a representative room (the reference room) or if the
room temperature is recorded using an external room sensor.
• Outdoor setback mode: If the “delayed” response to outdoor temperature falls below a user-
defined threshold, the heating system will operate in the same way as for reduced heating
operation (as described under “setback mode”). Above this threshold, the heating system will be
switched off (as described under reduction mode “shut-down mode”). This reduction mode is
suitable for heating zones that do not have their own remote control unit, and protects the rooms
from cooling down too much once a certain outdoor temperature is reached.
6.3.5 Frost protection
The frost protection function comprises the following options:
• no frost protection (frost protection is switched off)
• outdoor temperature (outdoor temperature sensor required) If the outdoor temperature falls
below the adjustable frost protection temperature threshold, the heating zone pump is switched
on automatically.
• room temperature (room temperature sensor in the RC35 or RC20) If the room temperature
falls below the fixed value of 41 °F (5 °C), the heating zone pump is switched on automatically. If
the room temperature rises above 44 °F (7 °C), the heating zone pump is switched off
automatically.
CAUTION: Risk of system damage due to freezing. The settings no frost protection
and room temperature provide either no frost protection or inadequate frost
protection. When these settings are selected, the display shows a message indicating
the risk of freezing.
B For reliable frost protection, use the outdoor temperature setting.
The room temperature setting does not provide absolute frost protection because
pipes laid in external walls (for example) could freeze even though the temperature in
the reference room might be clearly above 41 °F (5 °C) due to external heat sources
(fireplace etc.).
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