Full Product Manual

Functions
8
Grundfos COMFORT
3
Event log function
The AUTO
ADAPT
function incorporates an event log
that learns the scheme of demand for hot water in the
domestic hot-water system. Via the event log, the
pump predicts when to start circulating hot water.
The event log function stores the weekly tapping
events in the system. The hot-water consumption
pattern for two weeks is stored in the event log. See
example.
Example
• From 07:20 to 07:40, six tapping events (T) are
registered (morning bath).
• From 07:40 to 08:00, two tapping events (T) are
registered.
• From 23:30 to 23:45, one tapping event (T) is
registered.
This pattern implies that hot water should be available
for tapping from 07:20 to 08:00.
At 08:00 the pump can stop circulating hot water.
Likewise, the pump should circulate hot water for use
from 23:30 to 23:50.
The data shown is for one week of operation only. The
pump stores data for two weeks. When data for two
weeks has been logged, the pump is able to
distinguish between the tapping pattern during
workdays and weekends.
Pump control
Pump operation is based on the data stored in the
event log and on the temperature of the pipes.
The pump control incorporates a temperature
hysteresis, meaning that the pump ensures that the
hot-water temperature is within the range of what is
accepted as hot water. This temperature hysteresis
control is enabled when the data content of the event
log makes it probable that hot water will be tapped
within the next 20 minutes.
In the example, the hysteresis control will start at 07:00
and run continuously until 08:00.
Disinfection and flushing
Once a week a disinfection function is run for 15
minutes. If, at another time of the week, a higher
temperature is measured, the disinfection run will be
shifted to this time.
If the pump is switched off for eight hours, it will be on
to do a flushing of the circulation pipe with a duration
of 15 minutes.
Fault indication
Defective external temperature sensor
If in AUTO
ADAPT
, the red error indicator LED is on and
goes off when the pump is switched manually to
temperature control mode, the external temperature
sensor is defective. In this case, the pump turns
internally to temperature control mode, because the
external temperature sensor is needed for the
AUTO
ADAPT
control mode. The display does not
automatically change to temperature control mode.
Defective internal temperature sensor
If in AUTO
ADAPT
, the red error indicator is on and
doesn't go off when the pump is switched manually to
temperature control mode, the internal temperature
sensor is defective. In this case, the pump uses the
external temperature sensor for the temperature
control mode.
Date
Time of day
00:00 00:20 00:20 00:40 ------> 07:00 07:20 07:20 07:40 07:40 08:00 08:00 08:20 ------> 23:30 23:50
01 0 0 0 T 0 0 0
02 0 0 0 T T 0 0
03 0 0 0 T 0 0 0
04 0 0 0 T 0 0 0
05 0 0 0 0 T 0 T
06 0 0 0 T 0 0 0
07 0 0 0 T 0 0 0
08
09
10
11
12
13
14
0: No consumption.
T: Tapping event is registered.