Family Aqua Condens 3.5 BIS
4
gionella bacteria (bacteria occurs naturally in lakes and rivers all
over the world). The decimation of the bacterium is obtained by
taking the stored water to a temperature over 50/55° C. It is there-
fore recommended to position the DHW temperature selection
knob to maximum at least every 2/3 days, taking the temperature
of the stored water to 60° C, and maintaining this temperature for
a minimum time of 5 minutes.
The electronics of the machine offers the opportunity to exploit a
range of functions that allow to optimize the heating and DHW per-
formance, described in detail in the specific chapters:
- programming the parameters
- setting the thermoregulation.
Designed to be connected to the FAMILY REmote Control (acces-
sory).
2.1
Safety devices
The Family Aqua Condens 3.5 BIS boiler is equipped with the fol-
lowing safety devices:
Safety valve that intervenes in the event of excessive hydraulic pres-
sure (max 3 bar).
Water circuit diagnosis which safeguards the boiler in the event of
insufficient circulation or lack of water. The electronics of the boiler,
by comparing the temperature read by the outlet and return sensors
(circulation analysis) and the rise rate of the output temperature (no
water analysis) ensures the safety lockout of the appliance.
Flue gas probe: this intervenes (putting the boiler in safety stop
mode) if the temperature of the combustion products exceeds the
maximum operating temperature of the discharge pipes.
Flue gas safety evacuation system incorporated in the pneumatic
operation of the gas valve subject to the premix burner The gas valve
is opened based on the quantity of air pushed by the fan.
This implies that, if the flue gases exhaust circuit is blocked, the air
flow is cancelled and the valve does not have the ability to open.
Furthermore, the float present in the siphon prevents any passage of
the flue gases from the condensation discharge.
Condensate discharge obstruction safety device that via a con-
densate level sensor blocks the boiler if the level of condensate in the
heat exchanger exceeds the limit allowed
Over-temperature safety device on both the delivery and return
lines, with dual probe (limit temperature 95°C).
Fan safety that, through a Hall effect revolution counter, constantly
monitors the rotation speed of the fan.
The intervention of the safety devices indicates a potentially
hazardous boiler malfunction, therefore immediately con-
tact the Riello Technical Assistance Service immediately.
It is therefore possible to try and put the boiler back in service
after a short wait (see chapter on "First commissioning").
The boiler must not be put in service, even temporarily, with
non-operating or tampered safety devices.
Replacement of safety devices must be performed by the Ri-
ello Technical Assistance Service, by exclusively using original
manufacturer components and referring to the spare parts list
accompanying the boiler.
After carrying out the repair, perform an ignition test.
2.2
Circulator
The boiler is equipped with a variable speed circulator that is already
hydraulically and electrically connected, the performances of which
are indicated in the graph (fig.1-2).
The boiler is equipped with an anti-blocking system which starts up
an operation cycle after every 24 hours of stop, with the mode selec-
tor in any position.
The "anti-locking" function is only activated when the boiler is
electrically powered.
It is strictly forbidden to operate the circulator without water.
2.3
Variable speed circulator
The modulating circulator function is only active in heating mode. The
circulator is set to maximum speed when switch the three-way valve
to DHW. The modulating circulator function only applies to the boiler
circulator and not to circulators of other external devices connected
(e.g.. relaunch circulator).
You can choose from four operating modes depending on the situa-
tion and the type of system.
You can choose between these possibilities by entering the techni-
cian menu, parameter 90:
1
-
VARIABLE SPEED CIRCULATOR WITH PROPORTIONAL
MODE (41 <= P90 <= 90)
2 - VARIABLE SPEED CIRCULATOR WITH CONSTANT ∆T MODE
(2 <= P90 <= 40)
3 -
VARIABLE SPEED CIRCULATOR WITH MAXIMUM FIXED
SPEED MODE (P90 = 1)
4 - EXCEPTIONAL USE OF A STANDARD CIRCULATOR WITH-
OUT REGULATED SPEED (P90 = 0)
1
-
VARIABLE SPEED CIRCULATOR WITH PROPORTIONAL
MODE (41 <= P90 <= 90)
In this mode the boiler card determines which output curve to adopt
depending on the instantaneous power supplied by the boiler.
The boiler controller divides the power range in which the boiler op-
erates in heating into different levels. One of the available speeds
with linear logic is automatically selects depending on the power level
used during heating: maximum power = high speed, minimum power
= low speed.
Used on all system types where the power of the machine has been
correctly balanced with the actual requirements of the system.
In operational terms:
- Enter parameter 90
- Set the parameter = 41
Note: the parameter setting 90 = 41 is recommended by the manu-
facturer.
Values higher than 41 are used in special cases.
2 - VARIABLE SPEED CIRCULATOR WITH CONSTANT ∆T MODE
(2 <= P90 <= 40)
In this mode, the installer sets the value ∆T to be maintained be
-
tween the outlet and return (e.g. .: entering a value = 10 the speed
of the circulator will change to obtain a system output able to main-
tain the ∆T of 10° C upstream and downstream of the heat ex
-
changer).
Through periodic sampling of the boiler outlet and return sensor val-
ues, the card processes whether to increase or decrease the speed
of the circulator and thus the output of the system. If the sampling
reads a ∆T value below the set value, the speed is decreased until
the ∆T has increased to the set value. Vice versa, if the sampling is
higher than the set value the speed is increased.
Used for high temperature direct mode systems (typical of the re-
placement) in which the boiler is not using the temperature control
and where a calculated ∆T can be set.
Working at a constant outlet temperature and with the environment
regulation achieved, the average temperature of the radiators tends
to increase. Maintaining ∆T constant, thanks to the reduction of the
output, which is obtained from the change of the operating curve, a
reduced return temperature is achieved favouring greater boiler effi-
ciency and the reduction of electric consumption.
- In operational terms:
- Enter parameter 90
Set the parameter with a value between 2 and 40 (normally between
10 and 20).