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4.4.3 Air release valve
If not available, install an air release valve in the
priming port of non-submersible pumps. The valve is
factory-fitted to Grundfos JP pumps.
Vent the system by turning the plug on the air outlet
counter-clockwise by one complete turn from the
fully closed position. Air is automatically vented if the
cap is kept in this position.
4.5 Electrical installation
Carry out the electrical connection according to local
regulations.
Warning
During electrical installation, make sure
that the power supply cannot be
accidentally switched on.
The unit must be connected to an
external mains switch with a minimum
contact gap of 3 mm in all poles.
As a precaution, the unit must be
connected to a socket with earth
connection.
We recommend you to fit the
permanent installation with an earth
leakage circuit breaker (ELCB) with a
tripping current < 30 mA.
The PM Rain unit has a male plug for power supply
and a female socket for pump supply.
4.6 Connecting units with cable and plug
fitted
1. Connect the pump to the female socket of the
PM Rain.
2. Connect the male plug of the PM Rain to the
power supply.
4.7 Alternative power supply
The PM Rain can be powered by a generator or
other alternative power supplies, provided that the
requirements for the power supply are fulfilled.
See section 11. Technical data.
5. Control panel
1
2
3
Fig. 5
Control panel
Pos. Description
Function
The green indicator light is
permanently on when
mains water back-up is
active.
1
"Mains water"
Note: If the pump pressure
is below 2.25 bar (225 kPa),
the green indicator light will
be on even when rainwater
is used.
The green indicator light is
2
"Pump on"
permanently on when the
pump is running.
The red indicator light is
permanently on or flashes
in case of a fault.
See section 12. Fault
3
"Warning"
finding.
The indicator light also
illuminates briefly when the
power supply is switched
on.
The green indicator light is
permanently on when
rainwater is available.
Note: If the pump pressure
4
"Rain water"
is below 2.25 bar (225 kPa),
the green indicator light will
be off even when rainwater
is used.
Button for resetting of fault
5
[Reset]
indications.
4
5
7
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