andrews MAXXflo EVO CWH 30/201 Operating Instructions Manual page 38

4.5 COMPLETE PARAMETER LIST TABLE (CONTINuEd)
PARAMETER DESCRIPTION
dHW (continued)
1620 DHW release
24h / day
When this setting is used, DHW heating is continu-
ously released as long as it is switched on.
Time program 4/dHW
When using this setting, a specific time program is
available for DHW heating. For every weekday, a
time program with a maximum of three on phases
can be set. During the release time, the nominal
DHW setpoint applies, outside the release time, the
reduced DHW setpoint. If the legionella function is
pending, it will be performed when DHW heating
is released for the first time in the morning. Set-
ting "Once / several times per day" has no impact.
If DHW heating is switched off, the frost protection
setpoint will apply.
1630 DHW charging priority
1640 Legionella function
1641 Legionella function periodic
1642 Legionella function day
Periodically
The legionella function is repeated according to the
interval set (operating line 1641).
1644 Time for legionella function
1645 Legionella function setpoint
1646 Dwelling time at legionella
function setpoint
1647 Legionella function circula-
tion pump
Engineer
FACTORY NOTES
DEFAULT
Time Programme Defines when the heater is released for DHW heating
4
Absolute Only used when the controls are operating other space heat-
ing circuits
Off Used to activate function (operation modes are "Periodically"
or "Fixed weekday"
7 No of days before the legionella function will activate
Sunday Fixed week day the legionella function will start
Fixed weekday
The legionella function can be activated on a fixed
weekday (operating line 1642). When using this setting,
heating up to the legionella setpoint takes place on the
selected weekday, independent of previous storage tank
temperatures.
01:00 Time the legionella function will start
70 C The setpoint to be achieved for the legionella function. If B39
o
is installed and the function setpoint cannot be achieved (be-
cause of pipe work heat losses) try lowering the setpoint and
increasing the dwell time. Note: The higher the setpoint the
shorter the required dwelling time.
10 mins The length of time the DHW tank sensors and B39 circula-
tion return sensor (if fitted) are required to remain at setpoint.
If the legionella function cannot be performed successfully
within a 48 hour period, an error message will be displayed.
If no dwelling time is set, the legionella function is completed
the moment the setpoint is met.
Off If the function is turned OFF, the secondary return circulation
pump will be switched OFF while the "Legionella" function is
performed (anti-legionella action performed on tank only).
If the function is turned ON, the secondary return circulating
pump is switched ON while the "Legionella" function is per-
formed (anti-legionella action performed on DHW system).
38 MAXXflo EVO