Grundfos CRE Notice D'installation Et De Fonctionnement page 37

7.4.5 "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 fig. 48.
H
Fig. 48 Constant flow rate
This control mode requires a flow sensor as shown below:
Example
Q
Fig. 49 "Constant flow rate"
"Controller settings"
For recommended controller settings, see section
Controller settings"
7.11 "Controller" ("
Factory setting
See section 10. Technical data.
"Constant flow
rate"
●
●
Q
Q
set
).
7.4.6 "Constant level"
Pump variant
CME
CRE, CRIE, CRNE, CRKE, SPKE, MTRE
The pump maintains a constant level, independently of the flow
rate. See fig. 50.
H
Fig. 50 "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 fig. 51.
The type of level control function depends on the setting of the
built-in controller. See section 7.11 "Controller" ("
settings"
).
Examples
• One level sensor.
– emptying function (feed tank).
L
• One level sensor.
– filling function (storage tank).
L
Fig. 51 "Constant level"
"Controller settings"
For recommended controller settings, see section
Controller settings"
7.11 "Controller" ("
Factory setting
See section 10. Technical data.
"Constant level"
●
●
Q
Controller
).
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