Frost Protection; List Of Alarms - Grundfos PM 2 Installation And Operating Instructions

9. Frost protection

If the unit is subjected to frost in periods of inactivity,
the unit and the piping system should be drained
before the unit is taken out of operation.
The unit has no draining options, but
mounting the unit in one of the
Note
positions shown in fig. 7 makes
draining easier.
Fig. 7 Mounting positions making draining
easier
10.

List of alarms

Indication
"Alarm" is permanently on.
"Alarm" flashes once per
period.
"Alarm" flashes twice per
period.
"Alarm" flashes three times
per period.
"Alarm" flashes more than
three times per period.
Alarm
Dry running.
Cycling.
Maximum operating
time.
Protection mode.
Internal fault.
Cause
The pump has been running without water.
The pump is cycling.
Note: Occurs only if the anti-cycling function has
been enabled. See section 8.2 Anti-cycling.
The pump has been running continuously for
30 minutes.
Note: Occurs only if the function "maximum
continuous operating time (30 minutes)" has been
.
enabled See section 8.3 Maximum continuous
operating time (30 minutes).
The pump has had too many start/stop sequences
within a short period.
Each pump start is delayed a few seconds to
protect the installation. The start delay is active
until normal operation has been re-established.
Note: The protection mode will protect the
installation when the PM 2 is set to start/stop with
1 bar differential pressure, i.e. when DIP switch 5
is set to "ON". The protection mode functions
independently of the anti-cycling function.
Internal fault in the unit.
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