Full Product Manual

Functions
7
Grundfos COMFORT
3
3. Functions
COMFORT with AUTO
ADAPT
COMFORT BA PM and BXA PM models have the
following operation modes:
•AUTO
ADAPT
mode
• temperature control mode
• continuous 100 % mode.
AUTO
ADAPT
mode
The AUTO
ADAPT
function adapts the operating hours
by switching on and off according to the tapping
pattern of the users. This means that the pump
provides maximum comfort and saves energy at the
same time.
Energy-saving
The AUTO
ADAPT
function saves energy in two ways:
• Electrical energy consumption of the pump
• Heat energy consumption of the domestic hot-water
system.
The AUTO
ADAPT
function automatically adjusts the
number of operating hours, based on the hot-water
consumption in the given system.
The AUTO
ADAPT
function requires a temperature
sensor to be installed on the flow pipe 20 to 50 cm
from the boiler outlet. This sensor and the temperature
sensor incorporated in the pump detect when hot water
is tapped. The detected tapping events are logged and
used to predict the consumption pattern. The
AUTO
ADAPT
function automatically controls the on/off
behaviour of the pump according to this pattern. This
ensures that the pump only runs when necessary,
which saves both heat energy and electrical energy.
The pump needs two weeks to adapt when hot water is
tapped. This means that the pump starts up in
temperature mode the first two weeks even if you have
selected AUTO
ADAPT
.
Fig. 8 COMFORT BA PM or BXA PM pump with built-in
temperature sensor
AUTO
ADAPT
in heating systems regulated with a
thermostatic regulating valve
In systems including a thermostatic regulating valve,
choose a COMFORT pump without the AUTO
ADAPT
function.
Choosing a pump with AUTO
ADAPT
function will result
in two active regulating systems working separately,
which is not recommendable.
NOTE: If a pump with AUTO
ADAPT
function is installed
in a circulation system where the temperature of the
recirculated water is regulated by a thermostatic
regulating valve, we recommend that you open the
thermostatic regulating valve completely. This is done
by setting the valve to max., which deactivates its
regulating function.
Fig. 9 Example of an application with thermostatic
regulating valve
Control function
The control function is a combination of three
parameters:
• detection of hot-water consumption
• event log function (when the demand occurs)
• pump control.
Detection of hot-water consumption
The detection of hot-water consumption is done via the
temperature sensor installed in the flow pipe. The
system logs the tapping events. Temperature rise
caused by the pump operation is not registered in the
event log.
TM04 9359 4010
Max. 2.5 m
20-50 cm
TM05 7942 1613
Thermostatic valve