3
System set points
Menu button
System set points are entered via the front panel interface.
To stop unauthorised adjustment of set points a lock switch is positioned on the back of the display PCB this will
need to be switched to the unlocked position to enable set points to be changed.
Press the mode button and the duty cut in pressure will be shown, if it is flashing it can be changed,
Press up button to increase set point and down button to decrease set point.
Press menu again and Low pressure set point will be displayed, adjust as above.
Press menu again and high pressure set point will be displayed, adjust as above.
Press menu again and start delay will be shown, adjust as above.
Press menu again and Run Limit will be shown, adjust as above.
Press menu again and Exercise will be shown, set number days Max 28 between exercise runs.
Press menu again and pump 1 run hours will be shown, To reset the hours run to zero press both up and down but-
tons simultaneously for 8 seconds and the run time will be reset to zero.
Press menu again and pump 2 run hours will be shown, Reset as above.
Whilst in menu function the display will revert to operation mode if no action is taken for 5 seconds.
Mode button
This button scrolls between Auto, Hand 1, Hand 2 where fitted and off.
The normal position is Auto, select the options required and press the select button, and the option will then be locked
into the display.
In the off position no pumps are allowed to run but low and high pressures are still monitored.
In hand pump 1 or 2 press the select button and the selected pump will run for 10 seconds and then switch to off. Auto
will need to be selected after this operation.
To lock the selected data put the switch on the back of the display to the locked position.
Set point description
Delay start
This set point is adjustable between 0-10 seconds and is used to delay starting the pressurisation pump for the set
period. This can be useful especially on chilled water systems where it can be very difficult to remove all air.
Low pressure set point
This set point is typically set approximately 0.4 bar below the fill point.
High pressure set point
This set point is typically set approximately 0.2 bar above the final working pressure.
Duty pump cut in
This should be set to the static height of the building + 0.35 bar. The standby set points are automatically set from the
duty pump set points. System set point can be between 0.7 bar and 4.0 bar
Run Limit
The run limit is normally set to 20minutes but can be set up to 1 hour, after the time has elapsed all pumps will be
stopped until the problem has been rectified
Auto
This is the normal operating position for the set and will display system pressure.
Parallel operation
On two pump sets parallel operation can be selected which will enable a larger flow of water when called for which
will help unit run for shorter periods. To set to parallel operation jumper two on the back side of the display will need
setting to the parallel position.
O&M Micro Presfix_Layout 1 29/03/2017 11:15 Page 3
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