Riello 20187642, Installer And User Manual

Page: 4 / 36

FAMILY
4
ANTI-FREEZE SYSTEM
The boiler is fitted as standard with an automatic anti-freeze system that activates when the
temperature of the water in the primary circuit falls below 5°C. This system is always active
and provides protection for the boiler up to an air temperature in the installation area of >0°C.
b
To take advantage of this protection (based on burner operation), the boiler
must be able to switch itself on; any lockout condition (for ex. due to a lack
of gas or electrical supply, or the intervention of a safety device) therefore
deactivates the protection. b
When the boiler is installed in a place where there is a risk of freezing, with
outside air temperatures below >0 °C, an antifreeze heater kit must be used
to protect the DHW circuit and condensation drain (available on request - see
catalog) that protects the boiler up to -15 °C.
b
The installation of the antifreeze heater kit must be carried out only by
authorized personnel, following the instructions contained in the kit.
In normal operating conditions, the boiler can protect itself against frost. You are advised
to add a good quality anti-freeze liquid to the primary circuit (respecting the manufacturer’s
indications) if the temperature falls below >0°C, with the electricity supply disconnected and
the heating system full. For the hot domestic water part, we recommend you drain the circuit.
The boiler component materials are resistant to ethylene glycol based antifreeze liquids.
MINIMUM DISTANCES
To ensure access to the boiler for normal maintenance operations, respect the minimum
installation clearances envisaged.For correct appliance positioning, bear in mind that:
- it must be installed on a wall that can support its weight
- it must not be placed above a cooker or other cooking device
- it is forbidden to leave inflammable products in the room where the boiler is installed
- heat-sensitive walls (e.g. wooden walls) must be protected with proper insulation.
*
* see paragraph 2.7
measured in mm
2.3 Instruction for condensation exhaust connection
This product is designed to prevent the escape of gaseous products of combustion through
the condensation drain pipe with which it is equipped, this is obtained by using a special
siphon placed inside the appliance.
b
All components of the product condensation drain system must be properly
maintained in accordance with the manufacturer instructions and cannot be
modified in any way.
The condensation exhaust system downstream of the appliance must comply with the
relevant legislation and standards. The construction of the condensation exhaust system
downstream of the appliance is the responsibility of the installer. The condensation
exhaust system must be dimensioned and installed in such a way as to guarantee the
correct evacuation of the condensation produced by the appliance and/or collected by
the evacuation systems of combustion products. All the components of the condensation
exhaust system must be made in a workmanlike manner using materials that are suitable for
withstanding the mechanical, thermal and chemical stresses of the condensation produced
by the appliance over time. Note: If the condensation exhaust system is exposed to the risk
of frost, always provide an adequate level of insulation of the pipe and consider any increase
in the diameter of the pipe itself. The condensation exhaust pipe must always have an
adequate slope level to prevent the condensation from stagnating and its proper drainage.
The condensation exhaust system must have an inspectable disconnection between the
condensation exhaust pipe of the appliance and the condensation exhaust system.
2.4 Electrical wiring
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
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
- A B +
TBT
TA OT+ SE
bianco
nero
Utilizzare contatto
privo di tensione
CE4
CE8
Voltage free
contact input
- 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 mm2.
b
In the event of TA or TBT connection, remove the related jumpers on the terminal board.
OTBus remote control connection
When an OTBus remote control is connected to the system, the boiler display shows the
message “Open Therm Connected”, while some of its functions are disabled and transferred
to the OTBus remote control that takes control of the domestic hot water and heating
functions regarding the main zone.
42
°C
MENU STATE
SET INFO
OPENTHERM CONNECTED
HOT WATER TEMPERATURE
FRI
1.5
bar
09/04/2021 12:17
PLANT
In particular on the boiler display:
- it is no longer possible to set the boiler OFF/WINTER/SUMMER status (it is set by the
OTBus remote control)
- it is no longer possible to set the domestic hot water setpoint (it is set by the OTBus
remote control)
- it is not possible to activate the CHIMNEY SWEEPER function if a OTBus remote control
is connected to the boiler.
In addition
- The domestic hot water setpoint is displayed in the INFO menu in the place of the flow
meter flow rate value.
- The heating setpoint set on the boiler display is used only if there are heat requests from
the TA and the OTBus remote control does not have a request if the parameter DO_AUX1
= 1 or DO_AUX1 = 0 and the jumper on 1-2 pin of X21 is closed. We should point out that
it is not possible, with the OTBus remote control connected, to change the values of the
parameters ACTUATION TYPE and REQUEST TYPE of the main zone.
b
The OpenTherm connection is not enabled in the presence of a heat pump.
Note: an OT+ remote control cannot be connected if the system already has a
REC10CH or BE16 interface boards. in this case the system gives the following error
message:
WRONG CONFIGURATION
OPENTHERM CONNECTED
High voltage connections
The connection to the mains supply must be made via a separation device with an omnipolar
opening of at least 3.5 mm (EN 60335/1 - category 3). The appliance works with alternating
current at 230 Volt/50 Hz, and is in compliance with Standard EN 60335-1. It is obligatory to
make the connection with a safe ground/earth, in compliance with current directives.
b
The installer is responsible for ensuring the appliance is suitably earthed; the
manufacturer will not be liable for any damage resulting from an incorrect or absent
earth connection.
b
It is also advisable to respect the phase-neutral connection (L-N).