Operation; Maintenance - BWT D1 Instrucciones De Instalación Y De Servicio

EN
The required back pressure is set by turning the adjustment knob at quiescent
pressure (zero consumption) (Fig. a).
There are 2 ways to do this:
1) Setting using an adjusting scale
The setting can be made without operating pressure! The adjusting scale, visible
on both side, indicates the required setting pressure.
Loosen the fixing screw on the adjustment knob for a 1/4 turn (do not remove!)
by turning to the left. Turning the adjustment knob clockwise increases the back
pressure and turning anticlockwise reduces the back pressure. If necessary, check
the pressure using a pressure gauge. Now re-tighten the fixing screw.
2) Setting using a pressure gauge
The setting can be made only with operating pressure!
Shut off the water supply and relieve the valve on the outlet side, e.g. by drawing
off water, and make sure no further draw off is made. Loosen the fixing screw on
the adjustment knob for a 1/4 turn (do not remove!) by turning to the left.
If a setting below 3 bar (and/or the pre-setting) is required, turn the adjustment
knob to the left until the spring is completely relieved. Restore the water supply
and turn the adjustment knob to the right until the desired setpoint is reached.
If a setting above 3 bar (and/or the pre-setting) is required, restore the water
supply immediately and turn the adjustment knob to the right until the desired
setpoint is reached.
When making the setting, bear in mind that the back pressure set for zero con-
sump-tion will drop further as water is drawn off due to pressure and friction los-
ses. The degree of drop will depend on the amount drawn off.
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5. Operation

The D1 pressure reducer is intended to be operated in perfect condition and safety
and hazard-conscious. For the operation, the EN 806 and DIN 1988-200 must be
followed, as well as local standards and regulations.
The desired back-pressure is adjusted by turning the adjustment handle and rea-
ding it on the adjustment scale at resting pressure (zero consumption).
The optional manometer on the back-pressure side allows the control of the set
rear-pressure. Regular maintenance is also part of a proper operation of a technical
device, which shall be done by a specialist.

6. Maintenance

According to DIN EN 806-5, inspection and maintenance must be carried out at least
once per year to rectify any malfunctions that can be caused by contamination, cor-
rosion, calcification and natural wear. This interval may be shorter, depending on the
conditions of use. During this maintenance/inspection procedure, the screen must
be cleaned, the valve insert checked for fault-free condition and must be replaced if
required. Then check the back pressure is correct at zero flow and peak flow.
The function of the valve must be checked following prolonged shutdowns.
Attention!!!
During assembly work on the pressure reducer, the corresponding system part
must be depressurised and drained, depending on the medium.
Remove the valve insert
1. Shut off the water supply and relieve the valve of pressure.
2. Loosen the fixing screw on the adjustment knob (do not remove!) by turning
anticlockwise.
EN
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