Pressure Relief (4.4 - Grundfos CONTROL MPC Installation And Operating Instructions Manual

11.7.51 Pressure relief (4.4.8)

Fig. 96 Pressure relief
Description
This function is primarily used in heating and cooling applications.
The purpose of the function is to reduce the pressure in the
pipework by opening a solenoid valve if it exceeds a set limit.
If the pressure is not reduced within a given time, the solenoid
valve will be closed, and a warning can be given.
P [bar]
1
Valve opening
pressure
Valve opening pressure
minus band
Fig. 97 Pressure relief
Setting range
• Setting of digital output.
• Setting of pressure to be monitored.
• Setting of valve opening pressure.
• Setting of band for valve opening pressure.
• Setting of warning or alarm.
• Activation of the function.
54
1: Solenoid valve opens.
2: Solenoid valve closes.
3: Solenoid valve opens.
4: Warning is activated.
5: Solenoid valve closes, and
warning is reset.
2 3 4
5
Band
Time [sec]
Warning
delay
Setting via control panel
1. Mark the Settings menu with
2. Mark Monitoring functions with
3. Mark Pressure relief with
4. Mark Go to setting of digital output with
press .
5. Select a digital output with
6. Mark Pressure relief with
7. Return by pressing
8. Mark Pressure to be monitored with
.
9. Mark Discharge pressure, System pressure or External
pressure with or
10. Return with .
11. Mark Valve opening pressure with
pressure with or
12. Mark Band, valve opening pressure with
the pressure with or
13. Mark Warning, Deactivated or Activated with
and press .
14. Mark Delay with or
and save with . (Only to be set if warning has been
activated.)
15. Mark Activated with
function.
Factory setting
The function is deactivated.
or , and press
or , and press
or
or , and press
or , and save with
twice.
or , and press
, and save with .
or . Set the
, and save with .
or
, and save with .
or
. Set the time with or
or , and press activate the
.
.
, and
.
.
. Set
,
,