Fondital TAHITI CONDENSING KC24, Инструкция по установке, эксплуатации и обслуживанию

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9
ANTI-FROST
The boiler is equipped with anti-frost function, which is active in SUMMER/WINTER/ANTI-FROST modes.
When central heating water temperature sensor detects a water temperature of 5°C, the boiler is switched on and stays on at minimum
heat output until central heating water temperature reaches 30°C or 15 minutes have elapsed.
Should boiler shut down, pump operation is still granted.
In KC model, anti-frost function protects the domestic hot water system as well.
When domestic hot water probe detects a temperature of 5°C, the boiler ignites and stays on at minimum heat output until domestic hot
water temperature reaches 10°C or 15 minutes have elapsed (the deviating valve is set to domestic hot water position).
Should boiler shut down, pump operation is still granted.
In CH only boilers equipped with a DHW supply external cylinder, anti-frost function protects the cylinder as well. The function is active
only for cylinders equipped with
β
=3435 type NTC probe (refer to cylinder technical data).
When cylinder water temperature probe detects a water temperature of 5°C, the boiler is switched on and stays on at minimum heat ou-
tput until cylinder water temperature reaches 10°C or 15 minutes have elapsed (the deviating valve is set to domestic hot water position).
Should the boiler shut down, pump operation is granted.
Anti-frost function protects the boiler only and not the whole central heating system.
Central heating system is to be protected by means of an ambient thermostat, although this is disabled when the
boiler is set to the anti-frost and OFF modes. Should anti-frost protection be necessary for the boiler and CH system,
select winter position through no. 9 knob.
CH system can be effectively protected from freezing by means of specific anti-freezing addictives suitable in multi-metal systems.
Do not use automotive anti-frost products, and periodically check anti-frost product effectiveness.
PUMP AND DEVIATING VALVE ANTI-BLOCKING FUNCTION
Where the boiler is to remain inactive and:
- no. 9 selector is not set to the OFF position;
- boiler is not disconnected from electric main power supply;
the circulation pump (KC and KR) and three-way valve (KC), are operated for 3 minutes every 24 hours in order to prevent blockage.
1.2.3. External probe operation (optional equipment)
The boiler can be equipped with an external temperature probe (optional equipment), through which the boiler adjusts CH water tem-
perature according to outdoor temperature, in other words, increasing CH water temperature when outdoor temperature decreases and
vice-versa, providing increased energy saving operation (such boiler mode is called “sliding temperature operation”) .
Boiler microprocessor program determines CH water temperature variations.
When an external temperature probe is connected to the boiler, CH water temperature adjusting knob, no.
11 (pic. 1), loses its function and becomes a fictitious room temperature adjusting device.
When no. 11 knob is turned fully counter-clockwise, selected room temperature is 15°C; when set to 9:00
hours selected room temperature is 18°C; when set to 12:00 hours selected room temperature is 25°C;
when set to 3:00 hours selected room temperature is 32°C; when is turned fully clockwise selected room
temperature is 35°C;
For best curve setting, it is advisable a position close to 20°C.
Refer to 3.2.14. paragraph for detailed sliding temperature operation.