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Scale deposits should be removed from all internal surfaces, particularly
the heating element and thermistor. If the deposits are soft, use a nylon
pad and ush out. Abrasive cleaning materials containing scouring
powders and detergents must not be used, such materials can cause taste
problems. Suitable chemical de-scalants must only be used in accordance
with the manufacturers recommendations. This will prevent health and
safety issues, taste problems and potential damage to the appliance. All
trace of these chemicals must be removed from the appliance before re-
commissioning the unit . Misuse of such chemicals is not covered by the
product warranty.
IMPORTANT Before re-commissioning the boiler it is important that
all scale and moisture is removed from the level sensors, to avoid a
false signal being transmitted through the scale to the boiler body.
Failure to remove this scale and/or moisture could cause the sensor
to indicate to the PCB that water is covering the element, whether
or not water is present. In this situation the PCB could energise the
element causing failure. If in doubt, protect the element by hand
lling with water to the level of the draw-off tap before switching on
the electrical supply to the boiler.
The printed circuit board (PCB) controls the heating and lling functions
of the boiler by monitoring the thermistor and level sensors. The PCB also
controls the external light unit to indicate the current state of the boiler.
Red and yellow LED’S on the circuit board indicate whether the PCB has
energised the element or solenoid respectively.
Should an element fail and need to be replaced, it may be necessary to
replace the lid gasket to ensure a reliable steam-seal.
Note: the element
has a permanent ‘Live’ feed, and the ‘Neutral’ is switched.
Printed Circuit Board replacement (PCB)
In the event of a PCB failing and a replacement being required, full
instructions will be supplied. It is important to note however, that the Triac
PCB must be securely mounted against the copper heat-sink to ensure
reliable heat dissipation. Heat transfer compound is also supplied with all
replacement circuit boards.
Adjusting the Water Temperature Set Point
The temperature potentiometer (Pot) is pre-set at Calomax and will only
require adjustment in exceptional circumstances. Contact Calomax for
advice.
Water boils at different temperatures depending on barometric pressure.
The temperature should not be tuned higher than 98°C, or over boiling
may occur during low barometric pressure conditions, causing the unit to
trip the overheat cut-out device.
GENERAL FUNCTIONS
