4
1 - WARNINGS AND SAFETY
INSTALLATION MANUAL
EN
The boilers produced in our plants are built with great attention to
detail and every component is checked in order to protect users
and installers from injury. After working on the product, qualified
personnel must check the electrical wiring, in particular the stripped
part of conductors, which must not stick out from the terminal board,
avoiding possible contact with live parts of said conductor.
This instruction manual are integral parts of the product: make sure
it remains with the appliance, even if it is transferred to another
owner or user, or moved to another heating system. In case of loss
or damage, please contact your local Technical Assistance Service
for a new copy.
Boiler installation and any other assistance and maintenance opera-
tions must be carried out by qualified personnel according to the
provisions of the legislation in force.
The installer must instruct the user about the operation of the ap-
pliance and about essential safety regulations.
To use the boiler’s automatic anti-freeze protection function (for tem-
peratures down to -1°C), based on burner operation, the appliance
must be able to switch on. This means that any lockout condition
(e.g. lack of gas/electricity supply, or safety device intervention) will
deactivate the protection.
This boiler must only be used for the application it was designed
for. The manufacturer declines all contractual and non-contractual li-
ability for injury to persons or animals or damage to property deriving
from errors made during installation, adjustment and maintenance
and from improper use.
After removing the packaging, make sure the contents are in good
condition and complete. Otherwise, contact the dealer from whom
you purchased the appliance.
The safety valve outlet must be connected to a suitable collection
and venting system. The manufacturer declines all liability for any
damage caused due to any operation carried out on the safety valve.
Dispose of all the packaging materials in the suitable containers at
the corresponding collection centres.
Dispose of waste by being careful not to harm human health and
without employing procedures or methods which may damage the
environment.
During installation, inform the user to:
- in the event of water leaks, the water supply must be shut off and
the Technical Assistance Service must be contacted immediately.
- it is necessary to periodically check that the operating pressure of
the hydraulic system is above 1 bar. If necessary, reset the pres-
sure as indicated in the paragraph entitled “Filling the system”
- if the boiler is not used for a long time, the following operations
are recommended:
- turn the main switch of the appliance and the main switch of the
system to the “off” position
- close the fuel and water taps of the heating system
- drain the heating system to prevent freezing.
For safety, always remember that:
the boiler should not be used by children or unassisted disabled
people
it is dangerous to activate electrical devices or appliances (such as
switches, home appliances, etc.) if you smell gas or fumes. In the
event of gas leaks, ventilate the room opening doors and windows;
close the main gas tap; contact the Technical Assistance Service
or professionally qualified personnel immediately
do not touch the boiler while barefoot, or if parts of your body are
wet or damp
before any cleaning operations, disconnect the boiler from the mains
power supply by turning the two-position system switch and the main
control panel switch to the “OFF” position
do not modify safety and adjustment devices without the manufac-
turer's permission and relative instructions
In some parts of the manual, some symbols are used:
WARNING
= for actions requiring special care and adequate preparation
FORBIDDEN
= for actions that MUST NOT be performed
do not pull, disconnect or twist the electric cables coming out of the
boiler, even when it is disconnected from the mains power supply
avoid covering or reducing the size of the ventilation openings in
the installation room
do not leave inflammable containers and substances in the instal
-
lation room
keep packaging materials out of the reach of children
it is forbidden to obstruct the condensate drainage point.
2 - DESCRIPTION
MYNUTE GREEN 50 R.S.I.
is a Type C wall-mounted condensing boiler
capable of operating under different conditions through a series of jumpers
on the electronic board (as described in “Configuring the boiler”):
MODE A
heating only without any external storage tank connected.
The boiler does not supply domestic hot water.
MODE B
heating only with a thermostatically controlled external storage tank con-
nected: in this condition, with every heat request from the storage tank
thermostat, the boiler supplies hot water for the preparation of the domes-
tic hot water.
MODE C
heating only, with the connection of an external storage tank (accessory kit
available upon request) (managed by a temperature probe) for preparing
domestic hot water. When connecting the storage tank not supplied by us,
make sure that the NTC probe has the following characteristics: 10 kOhm
at 25°C, B 3435 ±1%.
According to the flue gas used, the boiler is classified in the following cat
-
egories B23P; B53P; C13, C13x; C23; C33, C33x; C43, C43x; C53, C53x;
C63, C63x; C83, C83x; C93, C93x.
In configuration B23P (when installed indoors), the appliance cannot be
installed in bedrooms, bathrooms, showers or where there are open fire
-
places without a proper air flow. The room where the boiler is installed
must have proper ventilation.
In configuration C, the appliance can be installed in any type of room and
there are no limitations due to ventilation conditions or room volume.
The main
technical characteristics of the appliance are:
- pre-mix, low emissions burner
- microprocessor card to control inputs, outputs and alarm management
- continuous electronic flame modulation in heat mode
- electronic ignition with flame ionisation control
- continuous current fan controlled by Hall-effect revolutions counter
- built-in gas pressure stabiliser
- NTC probe to control delivery temperature of the primary circuit
- NTC probe to control return temperature of the primary circuit
- device for separation and automatic purging of air
- 3-way valve with electric actuator (as accessory)
- water pressure switch
- hydrometer to visualise heating water pressure
- circulator anti-blocking device
- airtight combustion chamber
- electrically operated gas valve with dual shutter to command the burner
- external probe for thermoregulation (as accessory)
- self-diagnostics for signalling the cleaning of the primary circuit heat
exchanger
- circulator
- Range Rated - this means the boiler is equipped with a device that
adapts it to the heat requirements of the system, so the boiler output
can be adjusted according to the energy needs of the building
The
safety devices of the appliance are:
- a water limit thermostat, to check for any overheating of the appliance
and thereby ensure the 100% safety of the system. To restore operation
if the limit thermostat is triggered, press the button on the right, beneath
the boiler shelf
- a flue gas probe - this intervenes (putting the boiler in safety stop mode)
if the temperature of the combustion products exceeds the maximum
operating temperature of the discharge pipes
- a safety valve at 3.5 bar
- a microprocessor check of probe continuity, with any faults indicated on
the display
- a drain-tap with float, for discharging the condensate and preventing the
leakage of flue gases
- a condensate level sensor - this intervenes by blocking the boiler if the
level of condensate in the heat exchanger exceeds the limit allowed
