44
Fig. 45
A
Pressure gauge
B
Green led
C
2-digit LED display
D
Red led
E
Temperature selector space heating
F
Mode selector switch
G
Temperature selector Domestic Hot Water*
* The parts of the manual refering to the DHW circuit should be only considered if a indirect water tank with sensor is installed, case B (Fig. 61)
A
B
C
D
E
F
G
Domestic hot water (with connection to an external water tank
with probe)
The function starts if the temperature measured by the water tank
probe falls below 40°F (4°C). In this mode, a heat demand is
generated and the burner ignites at minimum power. This is
maintained until the temperature of the delivery water reaches
95°F (35°C).
NOTICE:
During the freeze protection mode, AF flashes on
the display (Fig. 56)
-
circulator anti-block:
if the boiler remains inactive, the
circulator performs a 30-second operating cycle every 24
hours. If the boiler is planned not to be used for a long
period, proceed as follows:
- move the function selector to OFF-RESET
- turn the main system switch to “off”
8. INDICATOR LEDS AND FAULTS
Green indicator LED (Fig. 52)
Off = boiler on stand-by, no flame
On = burner on, the boiler works regularly.
Red indicator LED (Fig. 53)
Stop:
just the fault code flashes on the digital display.
Block:
the red indicator LED lights up and the fault code flashes
on the digital display.
The fault code is not displayed in the OFF/RESET (
) mode. To
display it, move the function selector to
,
or
F
. During
combustion analysis and the freeze protection mode, instead, it is
displayed. To reset the boiler, turn the function selector to
(OFF/
RESET) and then move it to be required position (Fig. 47). If the
boiler still doesn’t work, call in the local Service Technician.
Summary of Contents for XPAK 120
Page 1: ......
Page 20: ...20 Fig 10 Fig 9...
Page 21: ...21 Fig 11 Fig 12...
Page 38: ...38 WIRING FUNCTIONAL DIAGRAM Fig 40...
Page 59: ...59 14 EXPLODED DIAGRAMS Drawing 1 5 7 9 3 12a 4 6 8 12a 1 10 2 11...
Page 60: ...60 Drawing 2 17 18 56a 56a 14 15 56b 13 16 12b 19...
