Stuart Turner Stuart SPU 130 Mini, Installation, Operation & Maintenance Instructions Manual, Page: 23 / 32

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8 MAINTENANCE
8.11 Routine maintenance & service checks:
Every 6 & 12 months (see service log sheets below) the SPU should be
inspected for:-
z
Damage to the electrical supply cable.
z
Damage to the outlet flexible hoses.
z
Leakage from the SPU 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 SPU Mini is designed and built to be a reliable and high quality product, in
the event of spares being required please see the Stuart Turner website for full
details www.stuart-turner.co.uk or contact TechAssist on +44 (0) 800 31 969 80.
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 SPU Mini.
2. Isolate the SPU Mini from the system and vent excess pressure to drain.
3. Run the SPU to pump excess water from the tank to drain.
4. Isolate the electrical supply from the SPU Mini.
5. Ensure the SPU cannot freeze . Damage will occure 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 SPU.
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