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4.2

GAS VALVE ADJUSTMENT

The

“RS”

boilers have the gas valve

equipped  with  a  coil  assembly,  which
enables, via the double-contact regula-
ting  thermostat,  a  reduction  in  output
corresponding to approx. 60% of nomi-
nal output before the burner goes out
completely. Calibration of the gas pres-
sures  at  the  maximum  and  reduced
values  is  done  by  SIME  in  the  factory.
Consequently  they  should  not  be  alte-
red.  Only  when  you  switch  to  another
type  of  gas  (butane  or  propane)  is  it
permitted  to  alter  the  operating  pres-
sures according to the value shown in
Table  3.

It is essential that this ope-

ration be carried out exclusively by
authorized technical staff.

When the

gas  pressures  are  to  be  reset,  this
must  be  done  following  a  set  order:
first  the  maximum  pressure  and  then
the reduced.

4.2.1

Maximum and minimum
pressure adjustment

To set the maximum pressure, pro-
ceed as follows (fig. 19):
–connect the pressure column or a

pressure gauge to the pressure
int ake locat ed on t he bur ner
manifold;

–unscrew the screw (4) completely;
–set the knob of the thermostat to

the maximum value;

–supply electric power to the boiler;
–loosen the locknut (1) and turn the

connection (3): to reduce the pres-
sure, turn the connection counter-
clockwise; to increase the pressure,
turn the connection clockwise;

–tighten the locknut (1);
–operate the main switch a number

of times, making sure that the pres-
sure corresponds to the values
given in

Table 3.

After having adjusted the maximum
pressure, calibrated the minimum
pressure as follows (fig. 19):
– always use the pressure column or

a pressure gauge to check the
pressure;

– deactivate the coil (2) electric supply;
–switch on the boiler and af ter a

short period of operation at nominal
output,  turn  the  thermostat  knob
slowly  towards  the  minimum  posi-
tion  until  you  hear  the  click  of  the
first contact of the thermostat;

–leave the knob in that position and,

turning the screw (4), seek the
reduced pressure value according
to

Table 3 for the gas in question: to

r educe  t he  pr essur e,  tur n  t he
scr ew  (4)  count er clockwise;  t o
increase  the  pressure,  turn  the
screw clockwise;

–restore electric power to the coil;
–operate the main switch a number

of times, making sure that the pres-
sure corresponds to the value given
in

Table 3.

4.3

COIL

The components of the coil are shown
in fig. 20.

4.4

CONVERSION TO
DIFFERENT GAS

A  kit  is  supplied  complete  with  neces-
sary  change-over  materials  for  opera-
tion with butane gas (G30) or propane
gas (G31). For changing over from one
gas  to  another  the  main  nozzles  and
the tapered spring (1 fig. 20) must be
replaced  with  another  supplied  in  the
boiler gas conversion kit. To adjust the
operating  pressures,  refer  to  section
4.2.1.  After  having  ultimated  the  con-
version  of  the  boiler,  please  stick  onto
the  casing  panel  to  the  plate  showing
the relevant freeding gas which is inclu-
ded into the kit.

NOTE:  After  assembling  all  the  gas
connections, a test for gas tightness
must  be  carried  out  using  soapy
water  or  special  products.  DO  NOT
USE NAKED FLAMES.

4.5

CLEANING AND
MAINTENANCE

At the end of each heating season, it is
essential to have the boiler thoroughly
checked and cleaned out in compliance
with the national legislation. Proceed
as follows (fig. 21):
–cut off electric power to the control

panel;

–remove the door of the outer casing

(2), the front panel (3), and the bot-
tom base strip (1);

KEY
1 Locknut M13
2 Coil
3 Max. pressure

adjust. connection

4 Reduced pressure

adjust. screw

Fig. 19

TABLE 3

Type of gas

Minimum pressure

Maximum pressure