pag. 20
9
EXTERNAL PROBE
9.1 INSTALLING AND CONNECTING
EXTERNAL PROBE
9.2 SETTING HEATING CURVE
9.3 ADJUSTING HEATING CURVE SET
When the external probe is used, the electronic board
calculates the boiler delivery temperature according to
the outside temperature.
The ratio of these temperatures is summarised in the
diagram in figure 9.2-1.
T
HIS MUST BE FITTED OTHERWISE BOILER WILL NOT PERFORM
AT THE MAXIMUM EFFICENCY
.
The most suitable curve should be chosen according
to the design temperature and the type of building.
To set a new curve (see “parameters that can be set”
in paragraph above):
- access parameter P5
- set the preselected value
- store to set value in memory
To mount the external probe:
-
remove protective cover as
shown here
-
insert probe cable through
hole intended to be used. We
recommend mounting a rubber
cable duct if the rear route is
used (see ref. 1), a suitable
cable holder if the lower one is
used (see ref. 2); cable duct
and cable holder are not sup-
plied.
.
If solution 2 is used, remove
the lower section the protecti-
ve cover.
-
connect the wires to the probe
and the boiler following the
wiring diagram on page 14.
20
-20
-15
-10
-5
0
5
10
15
20
30
40
50
60
70
80
90
2
n
4
6
8
10
12
14
16
18
20
Temperatura esterna mediata (
°
C)
Valore della pendenza della curva di riscaldamento
Curve di riscaldamento
Valore della pendenza della curva di riscaldamento
impostato in fabbrica= 15
24
22
28
32
36
40
25
1
2
3
H
1/2 H
min. 2,5 m
In order to adjust the heating curve, parameter P6 is
used. In this mode, the heating curve is shifted in
parallel so as to change the delivery temperature cal-
culated (see example in fig. 9.2-2).
To set the shift, proceed as follows (see “parameters
that can be set” in paragraph above):
- access parameter P6
- set preselected value
- store set value in memory
fig. 9.1-1
fig. 9.1-2
fig. 9.1-3
fig. 9.2-1
DO NOT INSTALL EXTER-
NAL PROBE IN POSI-
TIONS INDICATED
BELOW:
CORRECT INSTALLATION POSITION:
PROBE SHOULD BE INSTALLED ON
A NORTH ORNORTH EAST FACING
WALL AND SHELTERED FROM THE
EFFECT OF THE SUN’S RAYS AND
FROM OTHER HEAT SOURCES
value of slope of heating curve
heating curve
Factory-set value of slope of heating curve = 15
Mean outside temperature (°C)
Calculated flow temperature (
°C)
Summary of Contents for OPTIMA 28 CB
Page 1: ...OPTIMA 28 CB AND 28 SB WALL MOUNTED GAS BOILERS INSTALLATION INSTRUCTIONS...
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