Applications; Liquids; Temperatures; Operating Pressure - Grundfos PM Rain Installation And Operating Instructions Manual

3. Applications

The Grundfos PM Rain is designed to automatically
switch between rainwater and mains water supply.
This is done when the rainwater collecting tank is
empty, for example during long periods without rain.
When the rainwater tank is filled with rainwater
again, the PM Rain will automatically switch back so
that it supplies rainwater instead of mains water.
The PM Rain automatically starts and stops the
pump according to the water demand.
Typical applications are rainwater supply systems in
• single-family houses
• summer houses and holiday cottages
• horticulture and gardening.

3.1 Liquids

Clean mains water or rainwater without solid
particles or fibres that may attack the unit
mechanically or chemically.

3.2 Temperatures

3.2.1 Liquid temperature
0 to +60 °C.
3.2.2 Ambient temperature
0 to +55 °C.

3.3 Operating pressure

Max. 10 bar (1000 kPa).
4

4. Installation

4.1 Connections

1
2
Fig. 1 Connections of the PM Rain
Pos. Description
Mains water inlet.
1 For example mains water or other constant
water source.
Rainwater inlet.
2
Rainwater without solid particles.
3 Power supply from PM Rain to pump.
4 Power supply to PM Rain and pump.
Garden outlet fitted with a blanking cover.
5
Only rainwater. Optional use.
Home outlet.
6 Mains water or rainwater whichever is
available.
Material, type and size
Inlet/outlet Material
Mains water inlet Brass
Rainwater inlet Brass
Home outlet Brass
Garden outlet Plastic
6
5
4
3
Type and size
Female G 3/4
Male G 1
Female G 3/4
Male G 1