Grundfos CRE Installation And Operating Instructions Manual page 37

8.4.5 "Constant flow rate"
Pump variant
CME
CRE, CRIE, CRNE, CRKE, SPKE, MTRE
The pump maintains a constant flow in the system, independently of
the head. See the figure below.
H
Constant flow rate
This control mode requires a flow sensor as shown below:
Example
Q
"Constant flow rate"
"Controller settings"
For recommended controller settings, see the section on controller
settings.
Factory setting
See the section on factory settings.
Related information
8.11 "Controller" ("Controller settings")
9.2 Factory settings
"Constant flow
rate"
●
●
Q
Q
set
8.4.6 "Constant level"
Pump variant
CME
CRE, CRIE, CRNE, CRKE, SPKE, MTRE
The pump maintains a constant level, independently of the flow
rate. See the figure below.
H
"Constant level"
This control mode requires a level sensor.
The pump can control the level in a tank in two ways:
• As an emptying function where the pump draws the liquid from a
feed tank.
• As a filling function where the pump pumps the liquid into a
storage tank.
See the figure below.
The type of level control function depends on the setting of the built-
in controller. See the section on controller settings.
Examples
• One level sensor.
- emptying function (feed tank).
L
• One level sensor.
- filling function (storage tank).
L
"Constant level"
"Controller settings"
For recommended controller settings, see the section on controller
settings.
Factory setting
See the section on factory settings.
Related information
8.11 "Controller" ("Controller settings")
9.2 Factory settings
"Constant level"
●
●
Q
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