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8 MAINTENANCE
8 .11
Routine maintenance & service checks:
Every 6 & 12 months (see service log sheets below) the APU should be
inspected for:-
z
Damage to the electrical supply cable .
z
Damage to the outlet flexible hoses .
z
Leakage from the APU or the connecting pipework .
z
Test unit operation
z
Float valve check
z
Water condition check
z
Expansion vessel pre-charge check
8 .12
Wiring diagram
There are no user servicable wiring or components inside the controller
assembly .
DO NOT remove the retaining screws or the membrane cover over
the display .
8 .13
Spares
The APU Mini is designed and built to be a reliable and high quality product, in
the event of spares being required please contact the ADEY Customer Services Team
on +44 (0)1242 546717 .
8 .14
Long term isolation and restart procedure
If the system is to be shut down for an extended period of time due to
maintainance or system modifications being carried out to the system the
following steps must be taken .
1 . Isolate mains inlet water from the APU Mini .
2 . Isolate the APU Mini from the system and vent excess pressure to drain .
3 . Run the APU to pump excess water from the tank to drain .
4 . Isolate the electrical supply from the APU Mini .
5 .
Ensure the APU cannot freeze . Damage will occur to the pumps if this
is allowed to happen .
6 . Cover with plastic sheet or cardboard if work is to be conducted close to
the APU .
8 .15
Restart
To ensure the APU Mini is in good working order after a prolonged period of
maintainance the following steps should be taken .
1 . Inspect the APU Mini for signs of damage .
2 . Check APU Mini tank for debris, remove debris and clean tank if needed .
Debris may cause damage to the pumps if it is allowed to be drawn in .
3 . Check pressure vessel pre charge pressures before the system pressure is
increased .
4 . Open the mains water isolating valve allowing the APU Mini tank to fill, and
ensure the fill valve is operating correctly and maintaining the correct
water level .
5 . Check for signs of leakage .
6 . Open the drain valve on the outlet of the APU Mini .
7 . Turn on the mains electrical power and ensure both (if fitted) pumps can
run (use test pump option P6 if needed) and are pumping water to drain .
8 . Close the drain valve and allow the APU Mini to build pressure; the APU
should turn off as the isolation valve to the system is closed .
9 . Open the APU outlet isolation valve and monitor the APU Mini to ensure
there are no leaks as the system pressure increases .
10 . Check all the pre set values on the APU, to ensure they are still suitable for
the system (after maintainance/modification)
9 ENVIRONMENT PROTECTION
Your appliance contains valuable materials which can be recovered or recycled .
At the end of the product’s useful life, please leave it at an appropriate local civic waste
collection point .
BLACK
WHITE
RED
230 VAC/1PH/50Hz
SUPPLY
N
E
L
GREEN/YELLOW
BLUE
BROWN
BLUE
BROWN
BLUE
BROWN
PUMP 1
BOILER INTERLOCK N/C
L E N
L E N
2
1
PUMP 2
PRESSURE
TRANSDUCER
0 - 6 bar, 0,5 to 4,4 VDC
VOLT FREE ALARM CONTACTS - 5 AMP MAX.
LEVEL SWITCH
OPEN CIRCUIT AT LOW LEVEL
CLOSED CIRCUIT AT HIGH LEVEL
BLACK
RED
COMMON
SIGNAL
+5 VDC
Fig . 22
