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IM-P403-47 AB Issue 7
8. Fault finding
Problems experienced during commissioning are often found to be due to incorrect wiring,
so we recommend that a complete check is carried out. Check the mains supply voltage is
within the specified limits and that the controller has been set for the correct functions. The
controller may be checked for correct operation by substituting a resistor for the conductivity
sensor, or by using the Spirax Sarco Probe Simulator. This will allow the various controller
functions to be tested.
- Disconnect the conductivity sensor.
- Set switch 3 to 'µS/cm'.
- Set the left hand CAL potentiometer to '3' (± 0.5), and turn the right hand one fully clockwise.
- Select a resistor from the Table below and connect it between controller terminals 11 and 12.
- Adjustment of the set point potentiometer should then cause the green and amber LED's to
change state at approximately mid-scale.
Range setting (µS/cm) Resistor value
40 - 400 680 W
120 - 1 200 220 W
400 - 4 000 68 W
1 200 - 12 000 22 W
No special maintenance of the controller is necessary. The following maintenance, however, is
recommended for the system:-
Weekly
- Take a sample of the boiler water through a sample cooler, measure its TDS, or conductivity,
and check the controller calibration with the boiler at normal operating pressure.
- Check that the blowdown valve shuts off when the green LED is lit or when the power is removed.
- Operate any stop valves to ensure they shut off and remain free.
Every six months
- Isolate the system (or with the boiler empty) and remove the conductivity sensor.
- Clean the tip with fine abrasive paper and the insulation with a bristle brush or a cloth.
- Examine the blowdown control valve/solenoid valve, stop valve and other fittings.
- Clean and replace any parts necessary.
Available spares
Spare fuses Stock no. 4033380 Set of 3
7. Maintenance
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