Heating Circuit Module Hkm; Room Control Rrg - Potterton Eurocondense Plus Installation Manual

CONTROL STRATEGIES
Building frost protection
Hot-water frost protection
Restart inhibit
(burner starts)
Anti-legionaires' disease function
(only with room control module
RRG
Chimney sweep function
Deactivation of chimney sweep
function
Emergency operation functions
The building is protected against frost in all operating modes:
- Room control module RRG
(with effective room sensor):

- Heating circuit module HKM

with timer EMS/DSU or
room control module RRG
(without effective room sensor): requirement in the Standard and reduced mode.
- Room thermostat:
The tank is protected against freezing because the tank is automatically
charged when the temperature drops below the setting.
To reduce the number of burner startups, the boiler is equipped with a startup
inhibit of 3 min.
Heatup is started once a week on Monday with the first hot-water charge and
lasts for a maximum of 2.5 hours. In the "Stand-by" mode, the function is
inhibited. If it is inhibited for longer than 1 day, the anti-legionaires' disease
function is repeated as soon as the hot water is enabled.
The so-called "Chimney sweep" function can be activated by pressing the
Chimney sweep button (12) (> 3 sec.) (fault indicator (8) flashes once). The
burner is switched on and heats up the EUROCONDENSE EC at the
maximum boiler output until the temperature monitor trips at 82 °C.
Note: "SF" appears on display (13) and the fault indicator (8) flashes!
Press the chimney sweep button (12) (min 1 sec.) to deactivate the chimney
sweep function.
In the event of component failure, an error message is output (see Table 13),
leading to startup prevention and emergency operation function, however not
to fault switch-off.
Moreover, emergency operation is accomplished in the event of the
following faults:
G
Hot water mode:
Defective tank sensor: The Hot water mode is inhibited, heating operation
for the heating circuit is still ensured.
Defective room control module RRG or heating circuit module HKM: The
hot water temperature is regulated to the value set on the boiler module under
parameter "P 2".
G
Heating mode:
Defective outdoor temperature sensor: In the event of a defective outdoor
temperature sensor, the system is regulated to a boiler temperature
corresponding to an outdoor temperature of 0 °C.
The frost protection room
temperature setpoint is effective in all modes.
The building frost protection
is ensured by the heat
Building frost protection is
ensured by the heat requirement from
the room thermostat
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