grandimpianti S250-320/40 EA Mode D'emploi page 25

IRONING ROOM TECHNICIAN ABOUT
THE IMPORTANCE OF HAVING THE
CORRECT ROTATING DIRECTION.
5.5 LINKING UP THE IRONING
STEAM EXHAUST PIPE
In order for the steam produced while
ironing to be disposed of, link the steam
discharge pipe at the back of the right flank
to the ad-hoc steam exhaust system. Fasten
the pipe using one of the pipe clamps
supplied (cfr. installation diagram, page
90).
Ensure that the flue does not exceed the
length of 15 m. Do not install more than 4-
5 90° elbows: the machine's capacity to
exhaust fumes will otherwise be
dramatically reduced.
5.6 CONNECTIONS SPECIFIC TO
STEAM-HEATED MACHINES
Steam-heated machines must be installed
in perfect compliance with national and
local regulations.
Ensure that the boiler can provide dry
saturated steam suiting the required pressure
and amount. Then connect the steam inlet
pipe and the condensate trap onto the two
pipes at the back of the machine.
The size of steam-feeding /condensate-
return pipes and shut-off taps must be chosen
according to steam pressure and temperature
and to machine requirements (steam
consumption). Their diameter must not be
smaller than the inlets and outlets on the
ironer. The machine's supply pressure is 12
bar.
It is necessary to fit the fine-mesh
mechanical filter supplied on the ironer's
steam inlet, in order to prevent the impurity
existing on the steam line from damaging
the ironer, as well as a shutoff valve that is
indispensable for servicing and emergency
purposes.
Figure 7 on page 88 shows the position of
both the steam inlet and the condensation
water outlet.
The appliance's condensate outlet must be
coupled to a steam trap of appropriate size
(not included) according to the trap/outlet
distance and to the features of the
installation.
Other components like bleeders, heat
exchangers, condensate
superheaters or plenum chambers
(expansion boxes) need to be fitted according
to the characteristics of the installation and
to ironer performance.
Steam is intended as saturated (containing
no air).
Here is a list of the pros and cons of the most
widely-used steam traps:
5.6.1 Thermostatic liquid-expansion steam
trap
Does not retain condensate and consequently
does not freeze.
High draining capacity even when cold.
The minimum distance between the ironer's
outlet and the steam trap is 2 m.
Poor resistance to steam-pressure rush.
The flexible part does not resist corrosive
condensate.
5.6.2 Bimetallic thermostatic steam trap
In addition to the pros of the former type,
this steam trap provides higher resistance
to water hammer and to corrosive
condensate.
5.6.3 Float steam trap
Resists to load and pressure rush.
Easy to bleed.
Simple construction facilitates maintenance
and repairs.
Instant condensate draining.
Float does not resist to corrosive condensate,
water hammer events or steam overheating.
To be chosen according to operating
pressure.
5.6.4 Reverse bucket steam trap
Resists water hammer and steam
overheating.
Corrosion-resistant as an optional extra.
Simple construction.
Correct operation requires perfect choice of
size.
Responds to pressure and load rush more
slowly.
Continuous steam flow may occur in case of
pressure drop.
5.6.5 Thermodynamic steam trap
Size smaller than the previous models.
High condensate draining capacity.
Wide temperature and pressure operating
range.
Appropriate even with overheated steam
and corrosive condensate.
Water-hammer resistant.
No freezing risk if the drain is installed
downwards.
Inoperative when pressure is below 0.3 bar
or drain pressure is 80% higher than inlet
pressure.
CAUTION!
Use components that are appropriate for
steam/ condensate
temperature.
5.7 GAS CONNECTION:
pumps,
INSTALLATION OF GAS-HEATED
MACHINES
Entrust the installation and maintenance of
gas-operated machines to licensed
technicians only. DIY is absolutely
forbidden here.
Gas appliances must be installed in full
compliance with national and local
regulations.
There is a ½" gas inlet at the back of the
appliance (as shown on the installation
diagram). The machine is delivered ready
for operation on the gas type, class and
pressure indicated on the rating plate.
pressure and
23
When installing the machine, ensure that it
is suitable for the gas type it is going to be
supplied; the use of types of gas other than
the machine is prepared for entails bad
combustion and the highly harmful release
of carbon monoxide. The steam and flue
gas outlets are at the back of the appliance.
Diameters are those indicated in the
Technical details table. In particular, all
models are equipped with two exhaust
outlets: the first outlet is for ironing steam,
whereas the second is for the flue gas.
IMPORTANT!
ALWAYS KEEP THESE TWO EXHAUST
DUCTS SEPARATE.
5.7.1 Flue gas exhaust
The minimum length of the flue is 1 straight
meter plus a 90° bend. The maximum total
length of the flue is 20 mts + one 90° bend.
The flue pipe must be airtight and made of
heat-resistant material (max. temperature
350°C) and it must have a smooth inside
surface. Figure 7 on page 88 shows the
position of the flue gas outlet (F).
The standards provide detailed instructions
concerning the type and quality of the
materials for pipes, accessories, exhaust
ducts, flues and the like. Cfr.
UNI CIG 7129
UNI CIG 7131.
Use only approved flues.
For lengths over 20 mts plus one 90° bend
it is necessary to use insulated flue pipes.
The flue pipe must be airtight; it must not
release any flue gas into the premises where
the machine is installed.
CAUTION!
- One 90° bend equals a one mt straight
flue pipe.
- The control of the air/flue gas circuit
that ensures the correct burnt gas draught
and air-tightness, is capital for safety
purposes.
This control must be done by the installer
after all servicing jobs, however partial,
involving the system or the machine.
- All appliances including a burner take
in the air required for combustion and
discharge flue gas: if combustion takes
place indoors, fresh air must be drawn
from outdoors by an appropriate
ventilation opening.
However insulated, the flue pipe can heat
up and cause a risk of burns; it is therefore
advisable to absolutely avoid contact with
body parts.
A blocked flue pipe prevents the machine
from being fed with gas at the time of
ignition because a built-in protection device
takes over.
Before restarting the machine, have skilled
personnel remove the cause of the block in
the flue pipe and reset the flame controller
(reset push-button at the back of the machine
(pos. L on fig. 7).
Before any jobs on the machine, disconnect
it from the power mains.