Buderus RC35 Operations Instructions download pdf (Page 34)

System settings (Service menu – Settings)

Logamatic EMS RC35 programming unit - Subject to technical modifications

• Room setback mode: The heating system operates as if in setback mode (as described under

“reduced operation”), if the room temperature falls below the selected night temperature (set

value). Boiler and heating circuit pump stop (as described under setback mode “shut-down

mode”) if the room temperature exceeds the set night temperature by more than 1 K.

This setback mode is only possible if a programming unit/remote control is installed in a

representative room (reference room) or if the room temperature is captured by an external room

temperature sensor.

• Outdoor setback mode: The heating system operates as in reduced heating mode (as

described under setback mode “reduced operation”) if the adjusted outside temperature does

not reach the value of an adjustable outside temperature threshold. The heating system remains

off above this threshold (as described under setback mode “shut-down mode”). This setback

mode is suitable for heating circuits which do not have their own programming unit / remote

control unit. The operating mode protects the rooms from cooling down too much once a certain

outside temperature is reached.

6.3.5 Frost protection

The frost protection function offers the following options:

• no frost protection (frost protection is switched off).

• outside temp. (outside temperature sensor required) The heating circuit pump starts

automatically if the outside temperature falls below the adjustable frost protection temperature

threshold.

• room temperature (room temperature sensor of the RC35 or RC2x) The heating circuit pump

starts automatically if the room temperature falls below the permanently set value of 5 °C. The

heating circuit pump stops automatically if the room temperature rises above 7 °C.

At what outside temp. should reduction be interrupted?

EN 12831 requires that, for the maintenance of a level of comfortable heat, heating areas and heat

sources be designed to deliver a specific output if the heating system cools down to a specific value

through night setback.

CAUTION: System damage due to frost!

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 outside temp. setting.

The setting room temperature offers no absolute frost protection, as lines routed

through external walls may freeze up, for example, although the temperature in the

reference room may be significantly above 5 °C.

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Buderus RC35 Operations Instructions Page 34