Potterton EC three 125 Installation, Operation And Maintenance Manual page 91

Charging priority
(1630)
Legionella function
(1640)
Legionella funct periodically
(1641)
Legionella funct weekday
(1642)
Legionella funct time
(1644)
Legionella funct setpoint
(1645)
Legionella funct duration
(1646)
7308536-02 06.13
Fig. 22: Release according to time switching programme 4 (example)
This function ensures that the boiler capacity is primarily made available for DHW
in case of simultaneous capacity demand by room heatings and DHW.
- Absolute priority: Mixer and pumped heating circuits are blocked until the DHW
has been heated up.
- Shifting priority: Should the boiler capacity not be sufficient to heat up DHW,
mixer and pumped heating circuits will be restricted.
- None priority: Charging DHW is carried out in parallel with heating operation.
- MC shifting, PC absolute: Pumped heating circuits are blocked until the DHW
has been heated up. Should the boiler capacity not be sufficient, also the mixer
circuit will be restricted.
Function to kill legionella germs by heating up to the set legionella function set-
point (see programme number 1645).
- Off: Legionella function is switched off.
- Periodically: Legionella function is repeated periodically, depending on the set
value (prog. no. 1641).
- Fixed weekday: Legionella function will be activated on a certain weekday
(prog. no. 1642).
Setting the interval for the legionella function periodically (recommended setting
in case of additional drinking water heating by solar plant in connection with a st
tankmixing pump).
Selection of the weekday for the legionella function fixed weekday (factory set-
ting).
Setting the start time for the legionella function. The legionella function will be
carried out at the first release of the DHW preparation with the setting "---".
Setting the temperature setpoint for killing the germs.
With this function, the time will be set, during which the legionella function set-
point is activated to kill germs.
If the colder storage temperature rises above the legionella function setpoint by -1
K, the legionella function setpoint is assumed as met and the timer starts running.
If the storage temperature drops by more than the switching difference +2 K be-
low the required legionella function setpoint, the duration has to be met again. If
no duration has been set, the legionella function has been met immediately on
reaching the legionella function setpoint.
Condensing gas boiler Eurocondense three125-300 kW
Programming
91