11
Product efficiency characteristics:
Description
VERVE i
50
Maximum rated heat input
50
kW
Minimum rated heat input
15
kW
Domestic hot water maximum rated thermal input (80-
60)
kW
Domestic hot water minimum rated thermal input (80-
60)
kW
Parameter
Seasonal heating energy efficiency class
A
-
Rated input
44,2
kW
Seasonal energy efficiency in central heating mode
92,5
%
useful heat output
at rated thermal input and at high temperature rating
44,2
kW
at 30% of rated thermal input and at low temperature
rating
16,3
kW
Efficiency
at rated thermal input and at high temperature rating
88
%
at 30% of rated thermal input and at low temperature
rating
98
%
Auxiliary electric consumption
at full load
80
W
at partial load
24
W
in stand-by
2
W
Other parameters
Heat losses in standby
442
W
Annual energy consumption
94,2
GJ
Level of inner sound power
58,2
dB
Emissions of nitrogen oxides
38,5
mg/kWh
For combined heating appliances
Declared load profile
2 7 Pump
The boilers
VERVE i
come equipped with high-efficiency
modulating circulators, with the electrical and water con-
nections already complete.
Thanks to the new electronic circuit board installed on the
boiler, this circulator is capable of operating in both modu-
lating and fixed mode, with the latter offering three speeds:
- fixed mode at low speed
- fixed mode at normal speed
- fixed mode at maximum speed.
By default, the unit is set to operate in modulating mode. In
this case, when activated by the system, the pump starts
at maximum speed, and modulates after 1 minute until the
required
ΔT
target has been reached.
The boiler is equipped with an anti-blocking system, which
activates an operating cycle after every 24 hours of disuse,
regardless of the mode selector's position.
b
The "anti-blocking" function is only enabled if the boil-
ers are receiving electrical power.
b
It is strictly forbidden to operate the circulator without
water.
b
A minimum flow rate of 800l/h must be guaranteed
within the boiler in order to prevent the differential
pressure switch from being triggered.
The curve of the head available for the system, depending
on the water flow rate, is shown below (the boiler's load
losses have already been calculated).
The indicated flow rates refer to the range of possible spe-
cies.
In fact, the modulating circulator can adjust the speed in
order to obtain a constant temperature difference between
the delivery and return lines, as well as to always obtain the
maximum efficiency.
0
1
2
3
4
5
0,0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,8 2,0 2,2
6
7
Residual discharge head (m W
.C.)
System flow rate m
3
/h
Fig. 6
