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The following procedures are to be implemented only after the boiler is installed, tested and its installation is certified
by a qualified fitter.
• Open the gas stop cock.
• connect power mains to the boiler (no. 2 LED turns on displaying the green color);
• choose boiler mode by means of no. 4 selector (pic. 1);
• set the desired central heating water temperature by means of no. 4 adjusting knob (pic. 1);
• set the desired domestic hot water temperature by means of no. 5 adjusting knob (pic. 1);
• set room temperature by means of room thermostat (when available).
When CH is required, no. 1 LED turns on ( green ).
When flame is present no. 2 LED turns on ( yellow ).
Should the boiler be left inactive for a long time, particularly if boiler is lpg powered, ignition might be difficult.
Before starting the boiler switch on another gas powered device (e.g. kitchen range).
Beware that even by following that procedure, the boiler might still shut down once or twice.
Reset the boiler by turning no. 5 knob to
reset position for a few seconds.
1.2.2. Operation
To prevent frequent ignition and switching off in the heating mode, the boiler has a waiting time of 4 minutes between subsequent
ignitions.
Should water temperature in the system fall below 40°C, the waiting time is disallowed and the boiler re-ignites.
Boiler electronics always gives priority to DHW over CH supply.
Temperature can be adjusted within a 35°C to 58°C range.
The boiler is fitted with a flow-limiting device that allows a maximum DHW flow of 10 liter per minute.
Available DHW liters per minute depend on boiler thermal output and water mains supply temperature, according to the following
formula:
l = DHW liter = 340 (CTFS model)
or
318/∆t (for CTN model)
∆t
where ∆t = DHW temperature – water mains supply temperature
E.g. when water mains supply temperature is 8°C and DHW is required at 38°C, the value of ∆t is:
∆t = 38 °C – 8 °C = 30 °C
and DHW liters per minute) obtainable at the required temperature of 38°C are:
l = 340/30 = 11.3 [liters per minute] (mixed water to the tap - for model CTFS).
The boiler is equipped with an anti-frost protection system which is not active when the boiler is in stand-by mode.
When central heating water temperature sensor detects a water temperature of 5°C, the boiler switches on and stays on at its mini-
mum heating output until the temperature of central heating water reaches 30°C or 15 minutes have elapsed.
Should the boiler shut down, pump operation is in any case granted.
The anti-freeze function only protects the boiler and not the central heating system.
The central heating system must be protected by using an ambient thermostat, although it is disabled when
the selector is set to stand-by.
The heating system can be effectively protected against icing by using specific anti-freeze products that are suitable for multi-metal
systems. Do not use anti-freeze products for car engines, and check the effectiveness of the product used over time.
Where the boiler is left inactive and still connected to power the pump is activated for 30 seconds every 24 hours to prevent seizure.
1.2 Operating the Boiler
1.2.1 Switching On
