31
detailed instructions. ANY EXTERNAL CONTROL OR WIRING
MUST BE SERVED FROM THE SAME ISOLATOR AS THAT
OF THE APPLIANCE. The supply cable from the isolator to the
appliance must be 3-core flexible sized 0.75mm to BS 6500 or
equivalent. Wiring to the appliance must be rated for operation
in contact with surfaces up to 90 ºC.
Low voltage connections
Carry out the low voltage connections as follows:
- use connectors supplied as standard:
- 4-poles ModBus connector for BUS 485 (- A B +)
- 8--poles connector for TBT - TA - OT+ - SE
- A B +
TBT
TA OT+
SE
bianco
nero
Utilizzare contatto
privo di tensione
CE4
CE8
Voltage free
contact input
Fig. 19
CE4
(- A B +)
Bus 485
CE8
TBT
Low temperature limit thermostat
TA
Room thermostat (contact without voltage)
OT+
Open therm
SE
Outdoor temperature sensor
bianco
white
nero
black
- Carry out the electrical wiring connections using the desired
connector as shown in the detailed drawing.
- Once the electrical wiring connections have been made,
correctly insert the connector into its counterpart.
b
We recommend using conductors with a section no
larger than 0,5 mm
2
.
b
In the event of TA or TBT connection, remove/discard
the link-wire at CE8.
b
If the link-wires are removed and no controls are
connected to TBT, TA, OT on CE8, the boiler will not
light and may enter a fault condition.
Opentherm Control
When an OT control is connected to the appliance, the UI
screen will display ‘Opentherm Connected’. The control
functions of the appliance UI will be transferred to the OT
control, which can then be used to set/adjust the main heating
zone settings and the hot water settings.
UI Functions When OT Control is Connected
STATE function is disabled on the UI and must be set/adjusted
via the OT control. The outlet HW temperature cannot be
adjusted via the appliance UI, and is set/adjusted via the OT
control.
INFO Menu
When an OT control is connected, the info menu will display
the HW set-point instead of the HW flow-rate.
NOTE:
all/any functions of the ‘main’ zone are disabled on
the appliance UI and can only be accessed/adjusted via the
OT control.
18/05/2013
12:17
MENU
INFO
SET
42
°C
1.5 bar
FRI
PLANT
HOT WATER TEMPERATURE
STATE
Open Therm connected
5.7.1 FRONT COVER REMOVAL
Refer to fig. 20.
- Locate and remove screws ‘
A
’ that secure the spring clips to
the underside of the appliance.
- Gently unclip the spring clips ‘
C
’ and pull the front cover
outwards and then upwards in order to disengage it from the
tabs ‘
B
’ at the top of the appliance.
- Place the front cover in a safe area to avoid any risk of da-
mage.
- Replace in the reverse order.
REMOVAL OF SIDE PANEL/S
Remove the front cover as indicated above:
- locate and remove the 2-screws that secure the side panel
to the appliance
- gently prise the side panel forward to release it from the
securing tabs on the appliance rear
- replace in the reverse order.
WARNING
b
DO NOT
remove the ‘side’ panels if/when the appliance
has been installed to within the minimum clearances,
i.e. 2mm.
When refitting the side panels, it is essential that the LH
panel is fitted to the left side and the RH panel is fitted to
the right side (refer to the attached label).
b
The front cover and side panels are an intrinsic part
of the ‘room-sealed’ element of the appliance; any
damage that results in a loss of their integrity will
require the replacement of the cover.
b
The noise absorbing panels that are located inside
the front cover and side panels also act as seals to
ensure airtightness and the room-sealed integrity of
the appliance. It is essential that these are correctly
positioned during the refitting of the front cover
and/or side panels. Any subsequent damage or
deterioration to the noise absorbing panels must be
rectified before the appliance i
s put back into service.
B
A
C
Fig. 20
