Protective Cover; Fitting Of The Non-Return Inlet Valve - Watts MQ 3-45 Instrucciones De Instalación Y Funcionamiento

8.4.2 Suction hose instead of pipe
If a suction hose is used instead of a pipe, the hose
should not exceed the lengths stated in the graph
located on page 57. The suction hose must be
a minimum of 1" in diameter and be of the non-
collapsible type.
8.4.3 Long suction pipes
A separate non-return inlet valve is supplied with the
pump. In case of long suction pipes, we recommend
that you fit the non-return inlet valve in the pump
suction port. See section 8.4.4 Fitting of the non-return
inlet valve
The pipes must be adequately supported on either
side of the pump to avoid straining the pump
connections.

8.4.4 Fitting of the non-return inlet valve

The non-return inlet valve reduces the risk of losing
pump priming in negative suction applications and
improves the auto-aspiration capability, for example in water supply from a cistern.
Install the non-return inlet valve as follows, see
fig. 10:
1. Remove the suction connection of the pump.
2. Fit the non-return inlet valve into the suction port
in the direction shown in fig. 10.
3. Refit the pump connection.
NOTICE
Applications with positive inlet pressure do not
require installation of the non-return inlet valve
due to the fact that the MQ pump incorporates an
internal non-return valve at the discharge side.
Fig. 10 Fitting of non-return inlet valve
10

8.5 Protective cover

CAUTION
!
To prevent sun or water damage to the touchpad
and control, the protective cover MQ 3-45 COV
(#96693071) is required for outdoor use.
NOTICE
Failure to use the protective cover in outdoor
installations will invalidate the warranty.
The protective cover is available as an accessory.
See section 13. Accessories.
To fit the protective cover, click the cover onto the
top of the control panel so that it engages with the
top cooling ribs.
To remove the cover, pull the two clips outwards, free
of the cooling ribs, and pull the cover upwards.
Fig. 11 Protective cover