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CONTROL OF CH TEMPERATURE
The output temperature of CH water is adjustable from a minimum of about 38°C to a maximum of about 85°C by turning the knob C.
Approx CH flow temperatures for the boiler thermostat settings:
Minimum (38 ° C)
C
Maximum (85 ° C)
In these cases, however, it is advisable to install a small water treatment device or softener. With such a device you should avoid periodic descaling.
Consequently, the DHW heat exchanger will keep its performance consistent for a longer period of time with resulting gas savings.
TO SHUT DOWN THE BOILER
For short periods
To turn the boiler off set the function selector C to the O position.
The appliance On lamp A will flash every 4 seconds.
For long periods
When you do not expect to use the boiler for a long period:
1Switch the the electricity supply off.
2Shut off the gas supply cock and the valves for the water circuits fitted under the boiler.
3If necessary, empty the water circuits.
CONTROL OF DHW TEMPERATURE (Mini C24, Mini C28 and Mini C32)
The temperature of the DHW leaving the boiler can be varied from a minimum of about 35°C to a maximum of about 55°C (within the power limits of the appliance) by turning the temperature control knob B.
Minimum (35 ° C)
B
Maximum (55 ° C)
Adjustment of the DHW temperature is completely separate from that of the CH circuit.
The adjustment system integrated within the boiler automatically controls the flow of gas to the burner in order to keep the temperature of DHW delivered constant, between the limits of maximum and minimum output.
Where the demand is at a low level or with the temperature set to the minimum, it is normal to see a cycle of lighting and extinguishing of the burner when running.
Adjustment
It is advisable to adjust the DHW temperature to a level commensurate with the demand, minimising the need to mix with cold water. In this way, the automatic control facilities will be fully exploited.
Moreover, where the amount of limescale present in the water may be particularly great, not exceeding the position as shown in the following illustration (about 50 ° C) minimises annoying incidences of scale deposits and clogging.
B
FROST PROTECTION
Mini C24, Mini C28 and Mini C32 appliances are provided with a built in
Therefore, when the boiler is not lit and used in cold weather, with consequent risk of freezing do not isolate the boiler from the electricity supply or close the gas inlet cock.
ESCAPE OF GAS
Should a gas leak or fault be suspected contact your local gas supplier without delay.
Do not search for gas leaks with a naked flame.
CLEANING
For normal cleaning simply dust with a dry cloth.
To remove stubborn marks and stains use a damp cloth and mild detergent.
Do not use abrasive cleaning materials.
MAINTENANCE
The appliance should be serviced at least once a year by a CORGI registered installer.
FAULTS
No heating or hot water
Check that gas and electricity are available at the boiler and that all switches are on.
Check that the system water water pressure gauge G reads at least 0,5 bar.
Check the
Hot water but no heating
Check that the programmer and room thermostat (if fitted) are both calling for heat.
Heating but no hot water
Check that cold water flows out of the taps at a minimum rate of 3.5 litres per minute (or 1 pint in 10 seconds or less). If not, look for stop valves not fully open.
If these simple checks fail to solve the problem, or the problem recurs, consult your service engineer.
