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

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1.2. Operating the boiler
1.2.1. Switching on
The following procedure is to be implemented only after the boiler is installed and tested by a qualified fitter.
• Open the gas stop cock;
• turn ON the power switch external to the boiler (no. 1 LED turns on);
• select boiler operation mode via no. 9 selector (pic. 1);
• set desired CH temperature via no. 11 knob (pic. 1);
• In KC model, set desired domestic hot water temperature via no. 10 knob (pic. 1); In KR model equipped with external cylinder, set
desired domestic hot water temperature directly on the external cylinder (see its instruction manual);
• Set desired room temperature by means of the room thermostat in the premises (when available).
When the flame on the burner turns on, no. 8 yellow LED turns on.
WARNING
Should the boiler be left inactive for a long time, particularly when boiler is LPG fired, ignition might be difficult.
Before starting the boiler switch on another gas powered device (e.g. kitchen range).
Beware that even by following this procedure, the boiler might still experience some starting difficulties and shut down once or
twice. Resume boiler operation by turning no. 9 knob to the reset position for two seconds and back to the desired position.
1.2.2. Operation
CENTRAL HEATING
Set desired CH water temperature via no. 11 knob (pic. 1);
CH water temperature adjusting range depends on selected operation range:
-
standard range
: from 20°C to 78°C (from full counter-clockwise position to full clockwise position);
-
reduced range
: from 20°C to 45°C (from full counter-clockwise position to full clockwise position).
Operation range choice is to be selected by the fitter or an authorized Service Centre (see 3.2.11. paragraph).
Instantaneous central heating water temperature is displayed on the control board via no. 2 through no. 7 LED’s (pic. 1).
To prevent frequent ignition and switching off in central heating mode, boiler is programmed to have a waiting time between subsequent
ignitions which depends on the selected operating range.
-
standard range
: 4 minutes;
-
reduced range
: 2 minutes.
Should water temperature in the system fall below the default value (see 3.2.11. paragraph), waiting time procedure is aborted and boiler
re-ignited.
DOMESTIC HOT WATER
Domestic hot water supply is activated in KC model and KR model equipped with an external cylinder (optional equipment). Such func-
tion always has priority over CH water supply.
In KC model, set desired domestic hot water temperature via no. 10 knob (pic.1). It can be adjusted within a 35°C to 57°C range (from
full counter-clockwise position to full clockwise position);
In KR model equipped with external cylinder (optional equipment), set desired domestic hot water temperature directly on the external
cylinder (see its instruction manual); no. 10 knob is not functional in this model operation.
WARNING
In KC model, a special adjusting device is installed, which limits domestic hot water flow rate to 13 liter per minute (KC 24), and
to 16 liter per minute (KC 32). Domestic hot water temperature supplied depends on no. 10 adjusting device, on the quantity
requested by the user and on water mains supply temperature.
In KC model, DHW liter per minute flow depends on the boiler’s thermal capacity and water mains supply temperature, according to the
following formula:
K
l = DHW liter per min. = --------
∆T
K represents:
- 401 in KC 24 model
- 507 in KC 32 model
∆t = DHW temperature – water mains supply temperature
E.g. in KC 24 model, when water mains supply temperature is 8°C and DHW is required to be 38°C, in order to have a shower, the value
of ∆t is:
∆t = 38 °C – 8 °C = 30 °C
and DHW liters (l per minute) available at the required temperature of 38°C are:
I = 401/30 = 13,4 [liter per minute] (mixed water at the tap)
In contrast, in KR model equipped with an external cylinder (optional equipment), available DHW flow depends on the cylinder capacity.
In KR model with external cylinder (optional equipment), every 15 days, the anti-Legionella function is activated; it consists in heating up
the cylinder to 65°C for 30 minutes, regardless of boiler mode setting.