reduction of the pump performance in periods with
small heating demands and consequently a
reduced flow-pipe temperature.
• Systems with almost constant flow rates, for
example one-pipe heating systems and underfloor
heating systems, in which variable heating
demands cannot be registered as changes in the
head as is the case with two-pipe heating
systems. In such systems, you can only adjust the
pump performance by enabling the temperature
influence function.
Selecting the maximum temperature:
In systems with a dimensioned flow-pipe temperature
of up to and including 55 °C, select T
max.
equal to 50
°C.
In systems with a dimensioned flow-pipe temperature
of above 55 °C, select T
max.
equal to 80 °C.
You cannot use the temperature influence function in
air-conditioning and cooling systems.
Factory setting
See the section on factory settings.
Related information
9.58 Factory settings for Grundfos GO
9.21 Limit-exceeded function
Use this function to monitor a measured parameter or
one of the internal values such as speed, motor load
or motor current. If a set limit is reached, a selected
action can take place. You can set two limit-exceeded
functions, meaning that you can monitor two
parameters or two limits of the same parameter
simultaneously.
The function requires setting of the following
parameters:
Measured
Set the measured parameter to be monitored.
Limit
Set the limit which activates the function.
Hysteresis band
Set the hysteresis band for when the function must be
deactivated again.
Limit exceeded when
Set the function to be activated when the selected
parameter exceeds or drops below the set limit.
• above limit
The function is activated if the measured
parameter exceeds the set limit.
• below limit
The function is activated if the measured
parameter drops below the set limit.
Action
If the value exceeds a limit, you can set an action.
The following actions are available:
• Not active
The pump remains in its current state. Use this
setting if you only want to activate a signal relay
output when the limit is reached.
• Stop
The pump stops.
• Min.
The pump reduces the speed to minimum speed.
• Max.
The pump increases the speed to maximum
speed.
• User-defined speed
The pump runs at a speed set by the user.
• Alarm and Stop
An alarm is given, and the pump stops.
• Alarm and Min
An alarm is given, and the pump decreases the
speed to a minimum.
• Alarm and Max
An alarm is given, and the pump increases the
speed to maximum.
• Alarm and User-defined speed
An alarm is given, and the pump runs at the
speed set by the user.
Detection delay
Setting the detection delay ensures that the
monitored parameter stays above or below a set limit
in a set time before the function is activated.
Resetting delay
The resetting delay is the time from when the
measured parameter differs from the set limit,
including the set hysteresis band, and until the
function is reset.
Example
The function is to monitor the outlet pressure from the
pump. If the pressure is below 5 bar for more than 5
seconds, a warning is indicated. If the pressure is
above 7 bar for more than 8 seconds, reset the limit-
exceeded warning.
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