Adey Midi 250 Instalasi dan Servis - Halaman 13

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7 OPERATION

7 .11
Normal operation:
The 'Home' screen will display the status of the tank water level, system
pressure and if any pump is running . Pressing the return key (D) will get back
to this screen .
Tank full
Pump 1
running
1
ON
2.10 bar
FULL
Fig. 24
A green 'Power on' light will be displayed on the front of the APU .
More detailed information is available by scrolling up or down to display:-
System pressure
System errors i .e . pump fail, low or high pressure or none .
System fill status on or off
Pump activity log
Last pump run
Alarm reset
Settings menu (access to more functions)
Advanced setting menu (access to more functions)
Test menu (access to more functions)
During normal operation the APU will monitor the system pressure and re-
pressurise the system if the system pressure drops below the system pressure
– differential pressure . See Fig . 20 .
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 filling operation of the APU Midi the pressure displayed on
the screen may be shown slightly higher than the set pressure whilst the
pump is running . As soon as the pump stops this displayed reading will settle
back to the actual system pressure .
During the normal operation of the pressurised system, the system pressure
will fluctuate due to expansion and contraction of the water as the system
temperature changes .
System pressure is
2.10 bar
Pump 2 is not
running
2
OFF
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When setting the differential pressure and the Hi and Lo alarms please ensure
that the normal system pressure fluctuations are below the Hi pressure alarm
set pressure and above the differential pressure . If this is not done the APU
will try to compensate for the pressure change causing an over pressure
within the system or alarms being triggered .
7 .12 Pump exercise function: If the pumps do not need to operate for more than
a week, both pumps will start for 3-5 seconds to avoid the pump(s) from
seizing due to inactivity .
7 .13 Fault codes:
If there is a system fault, a red light will be displayed on the front of the APU .
If the fault/alarm is cleared the red light will go out .
The current fault will be displayed on the screen and logged in the alarm log
(last 10 alarms) .
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