Fondital GIAVA KRB 12, Руководство по установке, использованию и техническому обслуживанию, Страница: 21 / 68

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1.14. Boiler operation
1.14.1. Switching on
It is presumed that the boiler has been installed by a qualified installer, it has been commissioned and is ready to operate correctly.
- Open the gas stop cock;
- turn the master switch installed ahead of the boiler ON. The display turns on and indicates the function currently active (see tables 1 and 2);
- select boiler operating mode pressing “Operating mode selection” button on the touch-screen (H, fig.1): OFF, SUMMER, WINTER, CH ONLY (paragraph
1.4.);
- set desired CH temperature (see par. 1.14.2);
- set the desired DHW temperature value by pressing the “DHW + and -” buttons (D, fig. 1);
- if one or more ambient probes or a thermostat are present, set the desired ambient temperature value and the weekly programming.
WARNING
Should the boiler be left inactive for a long time, particularly when boiler is propane-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.
Reset boiler operation by pressing the "reset" button (F, fig. 1).
1.14.2. CH function
Set desired heating water temperature via “CH + and -” buttons (E, fig. 1).
Heating temperature adjustment range depends on the selected operating range:
- standard range: 20°C to 78°C (press “CH + and -” buttons E, fig. 1);
- reduced range: 20°C to 45°C (press “CH + and -” buttons).
The operating range shall be selected by the installing technician or by a qualified Service Centre (see paragraph 3.2.10). During temperature
setting, the CH symbol (4, fig.1) on the screen flashes and the CH current setting is displayed.
For models with double or triple outlet for high-temperature and low-temperature zones (V, Z versions) the boiler operating range in CH mode
must be set to standard range. The mixing valve on the low-temperature zone flow will adjust the flow to the correct temperature, based on the
signal coming from the relevant zone.
When the central heating system requests heat from the boiler, the LCD displays the CH symbol steady on (4, fig.1) and the current CH flow water temperature.
The burner on symbol (24, fig.1) only shows while the burner is operating. The waiting time between one boiler ignition and the following one, used to
prevent boiler frequent turning on and off, ranges between 0 and 10 minutes (default value: 4 min.), and can be edited with the P11 parameter.
Should water temperature in the system fall below set minimum value, between 20°C and 78°C (default value for standard range: 30°C , default
value for reduced range: 20°C) to be edited with the P27 parameter, the waiting time is reset and the boiler re-ignites (see paragraph 3.2.10).
1.14.3. DHW function
The boiler is equipped with water heater with 130 litres single coil.
DHW production function may be enabled by the user in two ways:
- setting a water heater hour programming on the boiler (paragraph 1.10);
- using COMFORT function (paragraph 1.3).
The domestic hot water temperature can be set from 35 °C to 65 °C by means of the “DHW + and -” keys (D, fig. 1).
During temperature setting, the DHW symbol on the LCD appears and the DHW setting is displayed.
Water heater heating, through the COMFORT function or programming, is carried out only if the boiler is in SUMMER or WINTER mode. If the boiler
is in CH ONLY or OFF operating mode the water heater is not heated.
Boiler electronics always gives priority to DHW over CH supply.
1.14.4. Freeze protection function
This boiler is fitted with a freeze protection system, which works when the following functions are activated: OFF/SUMMER/WINTER/CH ONLY.
The freeze protection function only protects the boiler, not the whole heating system.
Ambient probes or a room thermostat must be used to provide freeze protection for the central heating system. Bear in mind,
however, that they are disabled when the boiler is in OFF operating mode.
To protect the system, as well as the boiler, set the boiler to WINTER operating mode
.
The CH 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.
In case burner cannot be ignited due to the lack of gas, the freeze protection functions are anyway enabled through the circulation pumps.