24
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
2.4 SYSTEM USE.
Before ignition, make sure the system is full of
water, checking that the pressure gauge needle
(6) points to a value between 1 and 1.2 bar and
make sure that the chiller circuit has been filled
as described in the condensing unit instructions
booklet.
- Open the gas cock upstream from the indoor
unit.
- Press the button (1) until the display switches
on. The system now goes back to the state prior
to switch-off.
(During ignition, the display shows in se-
quence: display segments all lit, parameter A11,
parameter A13).
- If the indoor unit is in stand-by, press the
button (1) again to activate it. If this is not the
case, go to the next point.
- Then press the button (1) in sequence and set
the system to summer (
), winter (
) or
heating/air conditioning (
) position.
The system, based on the settings you made, au-
tomatically handles which energy source to use,
choosing the most efficient among those available
to meet system requirements (Fig. 36). For example
the same request (i.e. domestic hot water request)
can be satisfied by the use of condensing unit,
shown by its symbol (
), or by the heat gene-
rator ( ). As an example of operation, below is
represented for practicality the condensing unit
operation mode.
•
Summer
(
)
:
in this mode, the system only
works to produce domestic hot water, the
temperature is set using the buttons (4) and
the corresponding temperature is shown on
the display by the indicator (14).
Summer and DHW heating in
progress mode
32
• Winter
(
)
:
in this mode, the system works
both to product domestic how water and room
central heating. The temperature of the DHW
is always regulated via buttons (4), the central
heating temperature is regulated via buttons
(5) and the relative temperature is shown on
the display by the indicator (14).
Winter and room central heating in
progress mode
33
•
Heating/air conditioning (
):
in this mode,
the system works both to produce DHW and to
cool the room. The temperature of the DHW
is always regulated via buttons (4), the cooling
temperature is regulated via buttons (5) and the
relative temperature is shown on the display by
the indicator (14).
Heating/Air conditioning and room
cooling in progress mode
34
From here on, the system works automatically.
If there are no requests (room central heating,
DHW production or cooling), the system goes
into the "stand-by" function. Each time the
condensing unit ignites, the display shows the
corresponding symbol (8) with the correspond-
ing power scale (10).
System's operating mode
Heat pump
Heat generator
Summer
Production of Do-
mestic Hot Water
OFF
ON
Winter
Production of Do-
mestic Hot Water
OFF
ON
Central heating
OFF
ON
or
ON
OFF
Production of
DHW and central
heating
OFF
ON (DHW)
or
ON (Central heating)
ON (DHW)
Air conditioning
Production of Do-
mestic Hot Water
OFF
ON
Room cooling
ON
OFF
ON (Cooling)
ON (DHW)
35