Unigas R91 VS Series, Manual Of Installation - Use - Maintenance, Page: 3 / 60

3
those parts likely to constitute sources of danger shall be made harm-
less.

In case the equipment is to be sold or transferred to another user, or in
case the original user should move and leave the unit behind, make
sure that these instructions accompany the equipment at all times so
that they can be consulted by the new owner and/or the installer.

This unit shall be employed exclusively for the use for which it is
meant. Any other use shall be considered as improper and, therefore,
dangerous.
The manufacturer shall not be held liable, by agreement or otherwise, for
WARNING! Failure to observe the information given in this manual, ope-
rating negligence, incorrect installation and carrying out of non authorised
modifications will result in the annulment by the manufacturer of the gua-
rantee that it supplies with the burner.
The damages resulting from improper installation, use and failure to com-
ply with the instructions supplied by the manufacturer.The occurrence of
any of the following circustances may cause explosions, polluting unburnt
gases (example: carbon monoxide CO), burns, serious harm to people,
animals and things:
- Failure to comply with one of the WARNINGS in this chapter
- Incorrect handling, installation, adjustment or maintenance of the burner
- Incorrect use of the burner or incorrect use of its parts or optional supply
SPECIAL INSTRUCTIONS FOR BURNERS
a Make the following checks:

• the burner should be installed in a suitable room, with ventilation ope-
nings complying with the requirements of the regulations in force, and
sufficient for good combustion;

• only burners designed according to the regulations in force should be
used;

• this burner should be employed exclusively for the use for which it
was designed;

• before connecting the burner, make sure that the unit rating is the
same as delivery mains (electricity, gas oil, or other fuel);

• observe caution with hot burner components. These are, usually,
near to the flame and the fuel pre-heating system, they become hot
during the unit operation and will remain hot for some time after the
burner has stopped.
When the decision is made to discontinue the use of the burner, the user
shall have qualified personnel carry out the following operations:
a
• remove the power supply by disconnecting the power cord from the
mains;
b • disconnect the fuel supply by means of the hand-operated shutoff
valve and remove the control handwheels from their spindles.
Special warnings

Make sure that the burner has, on installation, been firmly secured to
the appliance, so that the flame is generated inside the appliance fire-
box.

Before the burner is started and, thereafter, at least once a year, have
qualified personnel perform the following operations:
a set the burner fuel flow rate depending on the heat input of the
appliance;
b set the flow rate of the combustion-supporting air to obtain a combu-
stion efficiency level at least equal to the lower level required by the
regulations in force;
c check the unit operation for proper combustion, to avoid any harmful
or polluting unburnt gases in excess of the limits permitted by the
regulations in force;
d make sure that control and safety devices are operating properly;
e make sure that exhaust ducts intended to discharge the products of
combustion are operating properly;
f on completion of setting and adjustment operations, make sure that
all mechanical locking devices of controls have been duly tightened;
g make sure that a copy of the burner use and maintenance instruc-
tions is available in the boiler room.

In case of a burner shut-down, reser the control box by means of the
RESET pushbutton. If a second shut-down takes place, call the Tech-
nical Service, without trying to RESET further.

The unit shall be operated and serviced by qualified personnel only, in
compliance with the regulations in force.
GENERAL INSTRUCTIONS DEPENDING ON FUEL USED
ELECTRICAL CONNECTION

For safety reasons the unit must be efficiently earthed and installed as
required by current safety regulations.

It is vital that all saftey requirements are met. In case of any doubt, ask
for an accurate inspection of electrics by qualified personnel, since the
manufacturer cannot be held liable for damages that may be caused
by failure to correctly earth the equipment.

Qualified personnel must inspect the system to make sure that it is
adequate to take the maximum power used by the equipment shown
on the equipment rating plate. In particular, make sure that the system
cable cross section is adequate for the power absorbed by the unit.

No adaptors, multiple outlet sockets and/or extension cables are per-
mitted to connect the unit to the electric mains.

An omnipolar switch shall be provided for connection to mains, as
required by the current safety regulations.

The use of any power-operated component implies observance of a
few basic rules, for example:
- do not touch the unit with wet or damp parts of the body and/or with
bare feet;
- do not pull electric cables;
- do not leave the equipment exposed to weather (rain, sun, etc.)
unless expressly required to do so;
- do not allow children or inexperienced persons to use equipment;

The unit input cable shall not be replaced by the user. In case of
damage to the cable, switch off the unit and contact qualified person-
nel to replace.
When the unit is out of use for some time the electric switch supplying all
the power-driven components in the system (i.e. pumps, burner, etc.)
should be switched off.
FIRING WITH GAS, LIGHT OIL OR OTHER FUELS GENERAL
General Warnings

The burner shall be installed by qualified personnel and in compliance
with regulations and provisions in force; wrong installation can cause
injuries to people and animals, or damage to property, for which the
manufacturer cannot be held liable.

Before installation, it is recommended that all the fuel supply system
pipes be carefully cleaned inside, to remove foreign matter that might
impair the burner operation.

Before the burner is commissioned, qualified personnel should inspect
the following:
a the fuel supply system, for proper sealing;
b the fuel flow rate, to make sure that it has been set based on the
firing rate required of the burner;
c the burner firing system, to make sure that it is supplied for the desi-
gned fuel type;
d the fuel supply pressure, to make sure that it is included in the range
shown on the rating plate;
e the fuel supply system, to make sure that the system dimensions are
adequate to the burner firing rate, and that the system is equipped
with all the safety and control devices required by the regulations in
force.

When the burner is to remain idle for some time, the fuel supply tap or
taps should be closed.
Special instructions for using gas
Have qualified personnel inspect the installation to ensure that:
a the gas delivery line and train are in compliance with the regulations
and provisions in force;
b all gas connections are tight;
c the boiler room ventilation openings are such that they ensure the air
supply flow required by the current regulations, and in any case are
sufficient for proper combustion.

Do not use gas pipes to earth electrical equipment.

Never leave the burner connected when not in use. Always shut the
gas valve off.

In case of prolonged absence of the user, the main gas delivery valve
to the burner should be shut off.