21
m
CAUTION
– For systems with water content exceeding the max-
imum system content (as indicated in the table) an
additional expansion vessel must be fitted.
– The difference in height between the relief valve
and the highest point of the system cannot exceed
6 metres. If the difference is greater than 6 metres,
increase the prefilling pressure of the expansion
vessel and the system when cold by 0.1 bar for each
meter increase.
5.9
Circulation pump
The flow-head performance curve available for the heating sys-
tem is shown in the graph below.
RESIDUAL HEAD (mbar)
0
0
800
1000
1200
600
400
200
100
200
300
400
500
600
30
35
Fig. 11
FLOW (l/h)
m
CAUTION
The appliance is equipped with a by-pass which en-
sures water circulation in the boiler when thermo-
static valves are used in the system. The heating sys-
tem design should incorporate a room thermostat.
Thermostatic radiator valves fitted to all radiators
except the room where the room thermostat is fitted.
Properties with floor areas exceeding 150squre me-
tres should be zoned.
5.10 Control panel
1
1
2
2
2
2
2
3
Fig. 12
1
KNOBS
t
The heating knob allows the user to set the heating
temperature to between 20 and 80°C during normal op-
eration (Default PAR tS1.3 / 1.4).
r
The domestic hot water knob allows the user to set the
domestic hot water temperature to between 10 and
60°C during normal operation.
2
FUNCTIONAL BUTTONS
s
Press for more than one second and release to step
through the operating modes (Stand-by – Summer –
Winter).
<
This allows the engineer to scroll through the parame-
ters or decrease the values.
>
This allows the engineer to scroll through the parame-
ters or increase the values.
o
This allows the engineer to confirm the selected param-
eter or to modify the value or to reset the appliances
from a lockout failure.
c
Programming connector cover plug.
NOTE:
pressing any one of these buttons for more than 30 sec-
onds generates a fault on the display without preventing boiler
operation. The warning disappears when the button is released.
3
DISPLAY
l
“SUMMER”
. This symbol appears when the boiler is
operating in Summer mode or if only the domestic hot
water mode is enabled via the remote control. If the
symbols
l
and
n
are flashing, this indicates that the
chimney sweep function is active.
n
“WINTER”
. This symbol appears when the boiler is oper-
ating in Winter mode or if both the domestic hot water
and heating modes are enabled via the remote control.
With dedicated remote controls CR or Home, if no oper-
ating modes have been enabled both symbols
l
and
n
will be off.
R
“RESET REQUIRED”
. This message only appears if there
is a malfunction which must be or may be restored
manually.
r
“DOMESTIC HOT WATER”
. This symbol is present during
a request for DHW or when the chimney sweep function
is operating; it flashes during the domestic hot water
set point selection.
t
“HEATING”
. This symbol is present during heating oper-
ation or when the chimney sweep function is operating;
it flashes during the heating set point selection.
f
“LOCKOUT” DUE TO NO FLAME
.
F
“FLAME LIT"
.
K
“ALARM"
. This indicates that a fault has occurred. The
number specifies the cause which generated the alarm
(see section "Malfunction codes and possible solu-
tions".
H
"MAINTENANCE REQUEST"
. If active, it shows it is time to
perform maintenance on the boiler.
