n
T1O
<
T1Oset, then NALAD active.
n
T1O
>
NAC03 SWITCH ON RECHARGING
, then NALAD blocked.
n
T1Oset (normal operation) =
BAS01 DHW TEMP.SETPOINT
+ DIFF.
n
T1Oset (legionella protection) =
LEG01 TEMP TERM. DISINFECTION
+
DIFF.
Dynamic temperature difference
DIFF is a dynamically calculated temperature differ-
ence that is required between the primary and sec-
ondary side of the plate heat exchanger in order to
reach the desired domestic hot water temperature at
the current flow rate.
If there is active communication in the eBUS network, the recharging
setpoint relayed is
PRI02 TANK TOP SETPOINT TEMP
plus 5 K.
6.9
Warm holding function
If the warm holding function is active, the temperature in the heat
exchanger is maintained at
BAS01 DHW TEMP.SETPOINT
plus minimum
temperature loss
STE14 MIN. TDIFF CHILLER
at the heat exchanger.
This prevents the heat exchanger from cooling down even after a pro-
longed tapping break and enables rapid domestic hot water control
when tapping recommences. If warm holding is not achieved after
WHF02 MIN SWITCH ON TIME
, the function is suspended for
WHF01 MIN
SWITCH OFF TIME
.
6.10
Cascade
In this mode, multiple stations can be interconnected for domestic
hot water preparation. In standby mode, all stations are hydraulically
separated by a zone valve ZV (L4/N/PE). The zone valve of the fore-
most station is always open.
Tapping active,
SEK04 FLOW RATE DHW > STE15 MIN FLOW RATE
. The
first station enters operation. If this switch-on threshold is reached
for a station, the second station is switched on. The switch-on
threshold corresponds to the speed of the primary pump and can be
adjusted
KAS05 SWITCH-ON POINT CAS.
. A defined time
KAS03 TIME
LAG STATION
must be exceeded in relation to this threshold. Both sta-
tions control the domestic hot water setpoint temperature at the
outlet sensor TWW, see
Ä
Chapter 6.1 “Fresh water preparation”
on page 36.
Function
Setpoint
Communication
Warm holding function
Cascade
Function
ES 5941
Functions
08/2020 Item no. 215790 EA no. 1321
Operating instructions
42