Grundfos PM 1 User Manual

English (GB)
13
11.4 Dry-running protection
The pressure manager incorporates dry-running
protection that will automatically stop the pump in
case of dry running.
The dry-running protection functions differently
during priming and operation.
11.4.1 Dry running during priming
If the pressure manager detects no pressure and no
flow for five minutes after it has been connected to a
power supply and the pump has started, the dry-
running alarm will be activated.
11.4.2 Dry running during operation
If the pressure manager detects no pressure and no
flow for 40 seconds during normal operation, the dry-
running alarm will be activated.
11.4.3 Resetting of dry-running alarm
Manual resetting
If the dry-running alarm has been activated, the
pump can be restarted manually by pressing [Reset].
If the pressure manager detects no pressure and no
flow for 40 seconds after restarting, the dry-running
alarm will be re-activated.
Auto reset
When the auto-reset function is enabled, the pump
will be restarted automatically after 30 minutes in
alarm condition. If, after restarting, the pump has not
been primed within five minutes of operation, the
dry-running alarm will reappear. The auto-reset
function will attempt to restart the pump every 30
minutes during the first 24 hours. Then there will be
24 hours between the restarting attempts.
12. Frost protection
If the pressure manager is exposed to frost in
periods of inactivity, the pressure manager and the
piping system must be drained before the pressure
manager is taken out of operation.
Fig. 10 Mounting positions making draining
easier
If the dry-running alarm has been
activated, the cause must be found before
the pump is restarted in order to prevent
damage to the pump.
The pressure manager has no draining
holes, but mounting the pressure manager
in one of the positions shown in fig. 10 will
make draining easier.
TM04 5458 3209 - TM04 5459 3209

Grundfos PM 1 Specifications

General

Brand	Grundfos
Model	PM 1
Category	Controller
Language	English