10 - START-UP AND OPERATION
XPak
The control panel contains the main boiler control and manage- ment functions.
1. SWITCHING ON THE APPLIANCE
Switch on the boiler as follows:
-Open the gas tap under the boiler by turning it counterclockwise (Fig. 46)
-Turn on the general switch of the system and then, after
lowering the flap, turn the function selector to summer 
,
winter 
or winter tank temperature 
F (Fig. 54) depending on the chosen operating mode.
Pump cycle mode: when power is restored to the boiler and/ or the boiler is powered for the first time, the boiler will enter a 2- minute purge cycle whereby only the pump will run for
Off/reset - Select this position when the boiler needs to be reset or switched off.
Summer mode 
- The domestic hot water function provided by the water tank is activated. The display indicates the storage tank temperature (only with the external water tank connected with a sensor).
Winter mode 
- The boiler produces hot water for heating and, if connected to an external water tank, it provides domestic hot water. The display indicates the boiler flow temperature.
Winter mode tank temperature 
F - The boiler produces hot water for heating and, if connected to an external water tank with a sensor, it provides domestic hot water.The display indicates the storage tank temperature.
2.HOW TO READ THE DISPLAY TEMPERATURE ● (dot in the middle)= means hundred (Fig.43)
● (dot on RIGHT side)= means DHW mode (Fig. 44) example:
Fig. 43 |
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| Heating mode | |||||
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| 60°F |
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| 160°F | |||||||||||
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Fig. 44 |
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| DHW mode | |||||||||||||||||||||
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40°F | 140°F |
NOTICE:
For temperature over 199°F (93°C) the display shows 
.
Adjusting heating water temperature
To adjust the heating water temperature turn the knob marked
(Fig. 50) clockwise to increase and counterclockwise to decrease.
When turning the knob, the required temperature automatically appears on the digital display.
NOTICE: Depending on the type of system, it is possible to
-standard systems
-floor systems
For further details, consult the “Boiler configuration” (Fig. 61)
3.ADJUSTING HEATING WATER TEMPERATURE WITH AN OUTDOOR PROBE CONNECTED
When an outdoor probe is connected, the value of the delivery temperature is automatically chosen by the system which rapidly adjusts ambient temperature to the changes in outdoor tempe-
rature. To increase or decrease the temperature with respect to the value automatically calculated by the PCB, turn the heating water selector (Fig. 50) clockwise to increase and counterclockwise to decrease.
Adjustment settings range from comfort levels - 5 to + 5 which are indicated on the digital display when the knob is turned.
4.ADJUSTING DOMESTIC HOT WATER TEMPERATURE (IF A STORAGE TANK WITH SENSOR AND
When turning the knob, the required temperature automatically appears on the digital display. The domestic hot water adjustment ranges lies between 95°F (35°C) and 140°F (60°C). When choosing the temperature, both for heating and domestic hot water, the display shows the value being selected. About 4 seconds after the selection has been made, the modification is recorded and the display returns to the delivery or domestic hot water temperature read by the probe. Priority is always given to DHW production.
The boiler setting depends from the jumper JP position (Fig. 63).
-CASE A (factory set) heating only + external water tank with thermostat adjustment inapplicable - jumper in position 3
-CASE B heating only + external water tank with sensor - to adjust the temperature of the domestic hot water in the water tank, turn the temperature selector clockwise to increase and counterclockwise to decrease - jumper in position 2.
5.WORKING THE BOILER
If a programmable timer or ambient thermostat are mounted, these must be switched on and adjusted to higher than ambient temperature in order to allow the boiler to start.
The boiler remains on standby until the burner ignites as a result of a demand for heat.The green indicator LED (B, Fig. 52), located on the
In the event of a starting or operating fault, the boiler performs a “SAFETY STOP”: the green indicator LED on the control panel goes out, a fault code flashes on the display (Fig. 53) and a red indicator LED (D) lights up in the event of a shutdown. To identify the fault codes and reset the boiler, consult the “Indicator LEDs and faults” section.
6. RESET FUNCTION
To reset the boiler, turned the function selector to 
(Fig. 54) then move it to the required position and check that the red indicator LED has gone out.
At this point, the boiler starts automatically if correct operating conditions have been restored; when the burner ignites, the green indicator led lights up and the digital display indicates the instantaneous operating temperature.
NOTICE: Simply turning the selector to 
does not reset the boiler.
If the boiler continues not to work, call your local Service Technician.
In normal operating conditions, when the function selector is turned to 
, the digital display indicates “-
7. SWITCHING OFF
For short absences (weekends, brief journeys, etc.) turn the function selector to 
OFF/RESET.
As the boiler remains powered with the gas tap open, it is protected by the following systems:
-Freeze protection: Heating
The function starts if the temperature measured by the flow sensor falls below 43°F (6°C). In this mode, a heat demand is generated and the burner ignites at minimum power. This is maintained until the temperature of the water flow reaches 95°F (35°C).
43
