Adjusting The Precharge Pressure; Setting The Start And Stop Pressure; Operating And Maintaining The Product - Grundfos CM Booster PS PT Instrucciones De Instalación Y Funcionamiento

8.2 Adjusting the precharge pressure

When the pump start pressure has been determined,
you can calculate the required precharge pressure of
the diaphragm tank. Adjust the precharge pressure
to 90 % of the start pressure.
When adjusting or reading the precharge
pressure, make sure that there is no water
pressure on the diaphragm tank from the
pipes.
See the installation and operating
instructions for the diaphragm tank. If the
pressure switch setting is changed, adjust
the precharge pressure.

8.3 Setting the start and stop pressure

DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply before
adjusting the pressure switch.
- Fit the cover on the pressure switch
before switching on the power supply to
check the start and stop pressure.
During this task, open the water intake and use the
pump gauge to check the start and stop pressure.
1. Loosen the nut (1) completely.
2. Adjust the nut (2) until you reach the desired start
pressure.
– Clockwise: increase the start pressure.
– Counterclockwise: decrease the start pressure.
3. Adjust the nut (1) until you reach the desired stop
pressure.
– Clockwise: increase the stop pressure.
– Counterclockwise: decrease the stop pressure.
Nut 1
Fig. 1 Pressure switch
9. Operating and maintaining the
product
Nut 2
DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply before you
start any work on the product.
- Make sure that the power supply cannot
be switched on accidentally.
WARNING
Pressurised system
Death or serious personal injury
- Before dismantling the pump, drain the
system or close the isolating valves on
both sides of the pump.
- Slowly loosen the drain plug and
depressurise the system.
CAUTION
Impurities in the water
Minor or moderate personal injury
- Before the pump is used for supplying
drinking water, flush the pump
thoroughly with clean water.
DANGER
Contaminated drinking water
Death or serious personal injury
- Flush the system before starting it or
after a standstill period.
Flush the system with clean water to
remove all impurities before you start the
pump.
Do not cover the motor. Make sure that an
adequate supply of cool air reaches the
motor cooling fan.
9