Grundfos CRE - Constant Pressure Control

8.4.1 "Constant pressure"
Pump variant
"Constant
pressure"
CME ●
CRE, CRIE, CRNE, CRKE, SPKE, MTRE ●
We recommend this control mode if the pump is to deliver a
constant pressure, independently of the flow in the system. See the
figure below.
H
Q
TM057901
"Constant pressure"
This control mode uses the factory-fitted pressure sensor, if any,
which measures the outlet pressure of the pump.
For pumps without a factory-fitted sensor, you must connect a
pressure sensor to one of the analog inputs of the pump. You can
set the pressure sensor in the "Assist" menu. See the section on
assisted pump setup.
Examples
• One external pressure sensor.
p
p
"Constant pressure"
"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")
8.41 "Assisted pump setup"
9.2 Factory settings
8.4.2
"Constant temperature"
Pump variant
"Constant
temperature"
CME ●
CRE, CRIE, CRNE, CRKE, SPKE, MTRE ●
This control mode ensures a constant temperature. Constant
temperature is a comfort control mode that you can use in domestic
hot-water systems to control the flow to maintain a fixed
temperature in the system. See the figure below.
H
Q
t
TM057900
"Constant temperature"
This control mode requires a temperature sensor placed at the
location where the temperature is to be controlled. See the
examples below:
Examples
t
t
"Constant temperature"
"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
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