Connection Of Mains-Water Pipe; Connection Of Suction Hose (Rainwater Collecting Tank) - Grundfos RMQ-A Montage- Und Betriebsanleitung

6.4 Connection of mains-water pipe

The built-in float valve is designed for a maximum
pressure of 6,0 bar.
The float valve has a simple filter in the inlet. If the
mains water is particularly dirty, we recommend that
you fit a strainer in front of the inlet to the float valve.
Fig. 6 Filter in the inlet
We recommend that you fit an isolating valve in the
fixed installation.
Procedure
1. Connect the mains-water pipe to the mains-water
hose of the unit. See fig. 1, pos. 4.
2. Fasten the mains-water pipe with pipe clamps.
The first pipe clamp must be fitted at a maximum
distance of 10-15 cm from the unit.
Do not push or pull the mains-water hose;
Caution otherwise it may cause failure of the float
valve.
3. Check that the float valve is positioned straight in
the mains-water tank. See fig. 7.
– The float must be able to move freely up and
down without touching the sides of the tank.
Fig. 7 The float valve seen from above
6.5 Connection of suction hose (rainwater
collecting tank)
The suction hose must be minimum 1" (25 mm
internal diameter).
Flush the suction hose before connecting it to the
RMQ unit. The suction hose must be fitted with a
suction filter (a floating suction filter is
recommended).
1
0.5m
Fig. 8 Suction hose in collecting tank
Pos. Description
1 Suction hose
2 Max. water level
3 Float
4 Suction filter
5 Level sensor
Avoid bends in the suction hose.
The maximum suction height of the pump can be
determined on the basis of the diagram on page 114.
Example
If the suction height is 2,5 m, the length of the
suction hose must not exceed 24 m.
The suction hose must slope gradually upwards to
avoid air pockets.
Procedure
1. Connect the suction hose to the suction hose
union. See fig. 1, pos. 6.
– Tighten the union without damaging the O-ring.
2. Fasten the suction hose with hose clamps.
2
3
4
5
7