24
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
2.5 USING THE BOILER.
Attention:
the boiler only works properly if it is
connected to the CAR
V2
, to the external probe sup-
plied as standard and combined with the Immergas
heat pump supplied separately.
Consequently, all controls and adjustments are re-
quested to the CAR
V2
(refer to the relative manual),
while the Standby button “
”, Reset button “C”
and the menu access button “D” on the boiler still
remain active.
Before ignition make sure the central heating sys-
tem is filled with water and that the manometer
(23) indicates a pressure of 1 - 1.2 bar;
Open the gas valve upstream of the boiler; it is
then possible to switch the boiler on.
When the boiler is switched off, the boiler display
only indicates the Stand-by symbol (10) the
CAR
V2
will show the connection error symbol
“ERR>CM” the CAR
V2
is in any case still powered
without losing the stored programs by pressing
the button (
) one switches the boiler on.
Connection to the CAR
V2
is detected automati-
cally and the boiler display indicates the symbol
(
).
Once the boiler is switched on, the display indi-
cates all operating information
•
Summer ( ):
in this mode the boiler only
operates for domestic hot water heating.
During domestic hot water heating, “DHW
ON” appears on the display (24) on the status
indicator (6) and at the same time as the burner
ignites, the flame presence indicator switches
on (8) with the relative power scale and the in-
dicator (9 and 7) with the instantaneous outlet
temperature from the primary heat exchanger.
Summer mode operation with domestic hot
water heating
2-2
• Winter ( ):
in this mode the boiler func-
tions both for heating domestic hot water and
heating the environment. Depending on the
climatic conditions and on the set-point, the
control electronics establish whether it is more
convenient to use the boiler, the heat pump or
both to heat the environment.
- Room heating with boiler: during the request
“CH ON” appears on the display (24) on the
status indicator (6) and at the same time as
the burner ignites the flame presence indica-
tor switches on (8) with the relative power
scale and the indicator (9 and 7) with the
instantaneous outlet temperature from the
boiler. During the heating stage, if the water
temperature is sufficient to heat the system,
the boiler can operate just with the activation
of water circulation.
Winter operation mode with room central
heating with boiler
2-3
- Room heating with heat pump: during the
request “CH ON” appears on the display (24)
on the status indicator (6) and at the same
time as the heat pump starts-up the indicator
switches on (26) as well as the indicator (7)
with the instantaneous outlet temperature
from the boiler.
Winter operation mode with room central
heating with heat pump
2-4
•
External probe operation (part. 18).
The
boiler flow temperature for room central
heating is managed by the external probe de-
pending on the external temperature measured
(Parag. 1.7 and par. 3.9 under item “P66”). One
can modify the operation curve by acting on
the central heating selector of the CAR
V2
(see
relative manual).
From this moment the boiler functions automati-
cally. With no demand for heat (central heating
or domestic hot water production) the boiler
goes to “standby” function, equivalent to the
boiler being powered without presence of flame.
N.B.:
it is possible that the boiler may start-up
automatically if the antifreeze function is acti-
vated (13). Moreover, the boiler can function
for a brief period of time after a withdrawal of
domestic hot water in order to take the domestic
hot water temperature back into temperature.
•
Air conditioning (
):
in this mode the boiler
works both for domestic hot water heating as
well as cooling, the boiler manages solely the
system circulator pump and the heat pump for
room cooling starts to work depending on what
has been set on the CAR
V2
.
During cooling “COOLING” appears on the
display (24) on the status indicator (6) and at
the same time when the heat pump starts-up
the indicator switches on (26) as well as the
indicator (7) with the instantaneous outlet tem-
perature from the boiler. The flow temperature
will be fixed at the “cooling set point” (SPC)
value set on the heat pump.
Cooling mode operation with heat pump
2-5
•
Stand-by
(
)
: Attention:
with the boiler in
stand-by mode, hot water cannot be produced
and the following safety functions are not en-
sured: pump anti-block device, antifreeze and
three-way anti-block device and the cooling
function is also inhibited.
• CAR Off:
with CAR
V2
off, the boiler display
indicates the “CAR OFF” operating status;
the boiler safety functions remain in any case
active.
