Operation - Stuart Turner Stuart SPU 130 Mini Installation, Operation & Maintenance Instructions Manual

7 OPERATION

7.11 Normal operation:
The 'Home' screen will display the status of the system pressure.
A green 'Power on' light will be displayed on the front of the SPU.
During normal operation the SPU will monitor the system pressure and re-
pressurise the system if the system pressure drops below the system pressure
- differential pressure. See Fig. 18.
Example: System pressure 2 bar, differential pressure 0.5 bar, pump will start
to re-pressurise system at 1.5 bar system pressure and stop at a system
pressure of 2 bar.
During the normal operation of a pressurised system, the system pressure
will fluctuate due to temperature changes causing expansion and contraction.
When setting the differential pressure for the Hi \ Lo alarms, please ensure
that the normal system pressure fluctuations are below the Hi pressure alarm
setting and above the differential pressure. If this is not done the SPU will try
to compensate for the pressure change causing an over pressure within the
system or alarms being triggered.
7.12 Error and alarm display:
The following errors are shown on the display:
Hi Pressure monitored by the SPU Mini is above the Hi alarm set pressure.
Display will flash between Hi and system pressure and red error light
will illuminate. Pumps will not run in this condition.
Lo Pressure monitored by the SPU Mini is above the Lo alarm set pressure.
Display will flash between Lo and system pressure and red error light will
illuminate. Pumps will run in this condition.
Er The input signal from the pressure sensor is outside its normal range.
Display will flash Er and red error light will illuminate.
Fig. 21
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