Nova Florida VELA COMPACT - 1.2 Operating the Boiler

7
The followin
g
procedures are to be implemented only after the boiler is installed, tested and its installation is certified
by
a
q
ualified fitter.
•
Open the
g
as stop cock.
•
connect
p
ower mains to the boiler
(
no.
2
LED turns on displayin
g
the
g
reen color);
•
choose boiler mode by means o
f
no.
4
selector
(
pic. 1
)
;
•
set the desired central heatin
g
water temperature by means of no.
4
adjustin
g
knob (pic. 1);
•
set the desired domestic hot water temperature by means of no. 5 adjustin
g
knob (pic. 1);
•
set room temperature by means of room thermostat
(
when available
)
.
W
hen CH is required, no. 1 LED turns on (
g
reen ).
W
hen

ame is present no.
2
LED turns on
(
yellow
)
.
S
hould the boiler be left inactive for a lon
g
time, particularly if boiler is lp
g
powered, i
g
nition mi
g
ht be difficult.
B
efore starting the boiler switch on another gas powered device
(
e.g. kitchen range
)
.
B
eware that even by followin
g
that procedure, the boiler mi
g
ht still shut down once or twice.
R
eset the boiler by turnin
g
no. 5 knob to reset
p
osition for a few seconds.
1
.2.2. O
p
eration
T
o prevent
f
requent ignition and switching o
ff
in the heating mode, the boiler has a waiting time o
f
4
m
i
nutes
b
etween su
b
sequent
ig
nitions.
S
hould water temperature in the s
y
stem fall below
4
0
°C, the waitin
g
time is disallowed and the boiler re-i
g
nites.
B
oiler electronics always
g
ives priority to DHW over CH supply.
T
em
p
erature can be ad
j
usted within a
3
5
°C to 58°C ran
g
e.
T
he boiler is tted with a ow-limitin
g
device that allows a maximum DHW ow of 10 liter per minute.
A
vailable DHW liters per minute depend on boiler thermal output and water mains supply temperature, accordin
g
to the followin
g
f
ormula:
l
= DHW lit
e
r =
3
4
0
(
CTFS model
)
o
r
3
1
8/∆t
(
for CTN model
)
∆
t
w
here ∆t = DHW temperature – water mains suppl
y
temperature
E
.g. when water mains supply temperature is 8°
C
and DHW is required at
3
8
°
C
, the value of ∆t is:
∆t
=
3
8
°
C
– 8 °
C
=
3
0
°
C
a
nd DHW liters
p
er minute
)
obtainable at the re
q
uired tem
p
erature of
3
8
°
C
are:
l
=
34
0/
3
0
=
11
.
3
[
liters per minute
]
(
mixed water to the tap - for model
C
TF
S)
.
T
he boiler is equipped with an anti-frost protection s
y
stem which is not active when the boiler is in stand-b
y
mode.
W
hen central heating water temperature sensor detects a water temperature of 5°
C
, the boiler switches on and stays on at its mini
-
m
um heatin
g
output until the temperature of central heatin
g
water reaches
3
0
°C or 15 minutes have ela
p
sed.
S
hould the boiler shut down, pump operation is in any case
g
ranted.
T
he anti-freeze function only protects the boiler and not the central heatin
g
system.
T
he central heatin
g
system must be protected by usin
g
an ambient thermostat, althou
g
h it is disabled when
th
e se
l
ector
i
s set to stan
d
-
b
y.
T
he heatin
g
system can be effectively protected a
g
ainst icin
g
by usin
g
specic anti-freeze products that are suitable for multi-metal
s
ystems. Do not use anti-
f
reeze products
f
or car engines, and check the e
ff
ectiveness o
f
the product used over time.
W
here the boiler is left inactive and still connected to
p
ower the
p
um
p
is activated for
3
0
seconds ever
y
24
hours to
p
revent seizure.
1.2 Operating the Boiler
1.2.1 Switching On