Grundfos CRE Instrucciones De Instalación Y Operación página 35

7.4.1 "Constant pressure"
Pump variant
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
fig. 40.
H
Fig. 40 "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 section
7.41 "Assisted pump setup".
Examples
• One external pressure sensor.
p
Fig. 41 "Constant pressure"
"Controller settings"
For recommended controller settings, see section
Controller settings"
7.11 "Controller" ("
Factory setting
See section 10. Technical data.
"Constant
pressure"
●
●
Q
p
).
7.4.2 "Constant temperature"
Pump variant
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 fig. 42.
H
Fig. 42 "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
Fig. 43 "Constant temperature"
"Controller settings"
For recommended controller settings, see section
Controller settings"
7.11 "Controller" ("
Factory setting
See section 10. Technical data.
"Constant
temperature"
●
●
t
Q
t
).
35