Use And Maintenance; Gas Valve Adjustment - Sime RS MK II Serie Manual Del Usuario

4 USE AND MAINTENANCE
4.1 GAS VALVE
Boilers. are. normally. produced. with. a. HO-
NEYWELL.VQ440MA.gas.valve.(fig..19).
4.2 GAS VALVE ADJUSTMENT
The. gas. valve. reduces. power. corresponding.
to.approximately.40%.the.rated.power.before.
the.burner.shuts.down.completely.by.means.
of.the.double.contact.adjustment.thermostat..
The.maximum.pressure.and.reduced.pressu-
re.are.calibrated.in.the.factory..It.is.therefore.
recommended.not.to.change.them..
Only. when. passing. to. another. type. of. gas.
(propane),.in.which.case.they.may.be.changed.
complying.with.the.values.shown.in.Ta b le 3..
This operation must be performed exclusi-
vely by authorised service technicians, or
the guarantee will be nullified.
Operations.involved.in.adjustment.of.pressu-
re. settings. must. be. carried. out. in. a. certain.
order,.adjusting.the.maximum.pressure.first.
and.then.the.reduced.pressure.
4.2.1 Adjusting maximum
and minimum pressure
Proceed.as.follows.to.set.the.maximum.pres-
sure.(fig..19):
–. Connect.the.column.or.pressure.gauge.to.
the. pressure. intake. on. the. burner. mani-
fold..
–. Unscrew. the. plastic. cap. of. the. pressure.
regulator.(6).
–. Set. the. thermostat. knob. to. the. maximum.
value..
–. Turn.on.the.power.supply.to.the.boiler.
–. Turn.the.screw.(6).anticlockwise.to.reduce.
pressure.and.clockwise.to.increase.it.
–. Turn. on. the. main. switch. repeatedly,. che-
cking. that. pressure. corresponds. to. the.
values.specified.in.Table 3..
–. Seal.the.pressure.regulator.screw.(6).and.
put.the.plastic.cap.back.on.
After. setting. maximum. pressure,. set. mini-
mum.pressure.as.follows.(fig..19):
–. Once.again,.use.the.column.or.a.pressure.
gauge.to.read.pressure..
–. Turn.on.the.boiler.and.allow.it.to.operate.
at.rated.power.for.a.short.time,.then.slowly.
turn. the. thermostat. knob. down. until. you.
hear.the.first.thermostat.contact.trip.
–. Leave.the.thermostat.knob.in.this.position.
and,.after.having.unscrewed.the.cap,.turn.
the.screw.(3).to.find.the.reduced.pressure.
value. specified. in. Table 3. for. the. type. of.
gas.in.use;.turn.screw.(3).anti-clockwise.to.
decrease.pressure.or.clockwise.to.increa-
se.pressure..
–. In. RS Mk II boilers from 129 to 172. turn.
the. minimum. pressure. adjustment. screw.
(3).anticlockwise.until.you.reach.the.pres-
sure.value.indicated.in.Table 3.
–. In. RS Mk II boilers from 194 to 279. turn.
the. minimum. pressure. adjustment. screw.
(3).anticlockwise.to.the.end.of.travel.even.if.
the.pressure.value.indicated.in.Table 3.has.
56
ATTENTION: Before performing any work on the boiler, make
sure that the same and its components have cooled in order to
prevent the risk of burns due to high temperatures.
2
1
9
KEY
1. Pressure.inlet
2.. EVG1.solenoid.valve
3.. Minimum.pressure.adjustment.screw
4.. EVG2.solenoid.valve
TABLE 3
Type.of.gas. Reduced.burner.pressure.
.
Methane.-.G20.
Propane.-.G31.
not.been.reached.
–. Turn. on. the. main. switch. repeatedly,. che-
cking. that. pressure. corresponds. to. the.
specified.value.
4.3 SECOND GAS
SOLENOID VALVE
The. gas. valve. is. manufactured. as. per. stan-
dard.complete.with.a.second.normally.closed.
solenoid.valve.
4.5 TRANSFORMATION TO
ANOTHER TYPE OF GAS
A.kit.is.supplied.containing.everything.requi-
red.for.transformation.to.propane.gas.(G31)...
To.switch.from.one.type.of.gas.to.another,.the.
main.nozzles.must.be.replaced.and,.after.ha-
ving.removed.the.plastic.cover,.the.minimum.
gas. pressure. switch. (9). must. be. set. at. 15.
(G20).or.25.(G31).
Proceed. as. specified. in. point. 4.2.1. to. adjust.
operating.pressures.
When.finished,.apply.the.plate.provided.in.the.
kit.for.identification.of.the.gas.for.which.the.
boiler.is.set.up.to.the.skirt...
NOTE: All gas connections must be tested for
3
4
5
8
5.. Pressure.outlet
6.. Maximum.pressure.adjustment.screw
7.. Relief.valve
8.. Minimum.pressure.valve.EVM
9.. Minimum.gas.pressure.switch
Max..burner.pressure
mbar.
6.
15.
seal using soapy water or products intended
for the pur pose after assembly. DO NOT USE
OPEN FLAME.
4.6 CLEANING AND
MAINTENANCE
At. the. end. of. the. heating. season,. perform.
boiler. cleaning. and. maintenance. as. follows. .
(fig..23):
–. Turn.off.the.power.supply.to.the.electrical.
panel.
–. Remove. the. skirt. door. (2). and. baseboard.
(1).
–. Unhook.the.upper.front.panel.(3)..and.hook.
it.to.the.pins.below.it.
–. Remove.the.cover.(6).
–. Remove.the.screw.holding.each.burner.(7).
in. place. and. remove. the. burner. from. the.
combustion.chamber.
–. Remove.the.screws.holding.the.upper.insi-
de.panel.(4).in.place.
–. Remove. the. screws. holding. the. cleaning.
panel.in.place.(5).
–. Clean. the. flue. gas. passageways. with. a.
brush..
–. Next.clean.the.burners,.blowing.air.throu-
gh.them.under.pressure..
–.. Check.the.positioning.and.wear.of.electro-
des.
6
7
mbar
9,7
35
Fig..19