Beretta CIAO GREEN 25 R.S.I. [18/156] Bleeding the air from the heating circuit and boiler
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Beretta CIAO GREEN 25 R.S.I. [18/156] Bleeding the air from the heating circuit and boiler

Beretta CIAO GREEN 25 R.S.I. [18/156] Bleeding the air from the heating circuit and boiler
18
CIAO GREEN R.S.I.
catingthegastype.Itisveryimportanttohighlightthatinsomecasesthe
smoke pipes are under pressure and therefore, the connections of several
elementsmustbeairtight.
3.2 Cleaning the system and characteristics of the
heating circuit water
In the case of a new installation or replacement of the boiler, it is necessary
to cleantheheatingsystem.
To ensure the device works well, top up the additives and/or chemical
treatments(e.g.antifreezeliquids,lmingagents,etc.)andcheckthepa-
rametersinthetablearewithinthevaluesindicated.
3.3 Securing the boiler to the wall and hydraulic
connections
To secure the boilertothewall,usethecrossbar(g.10)providedinthebox.
The position and size of the hydraulic connections are indicated below:
M Heating outlet 3/4”
MB Water tank delivery 3/4”
G Gas connection 3/4”
RB Water tank return 3/4”
R Heating return line 3/4”
3.4 Installation of the external sensor (g. 11)
The correct operation of the external sensor is fundamental for the good
operationoftheclimatecontrol.
INSTALLING AND CONNECTING THE EXTERNAL SENSOR
The sensor must be installed on an external wall of the building to be
heated, observing the following indications:
it must be mounted on the side of the building most often exposed to winds
(theNORTHorNORTHWESTfacingwall),avoidingdirectsunlight;itmust
bemountedabouttwothirdsofthewayupthewall;
it must not be mounted near doors, windows or air outlet points, and must
bekeptawayfromsmokepipesorotherheatsources.
The electrical wiring to the external sensor is made with a bipolar cable
withasectionfrom0.5to1mm
2
(not supplied), with a maximum length
of30metres.Itisnotnecessarytorespectthepolarityofthecablewhen
connectingittotheexternalsensor.Avoidmakinganyjointsonthiscable
however;ifjointsareabsolutelynecessary,theymustbewatertightand
wellprotected.Anyductingoftheconnectioncablemustbeseparated
fromlivecables(230VAC).
FIXING THE EXTERNAL SENSOR TO THE WALL
Thesensormustbexedonasmoothpartofthewall;inthecaseofex-
posedbrickworkoranunevenwall,lookforthesmoothestpossiblearea.
Loosentheplasticupperprotectivecoverbyturningitanticlockwise.
Afterdecidingonthebestxingareaofthewall,drilltheholesforthe5x25
wallplug.
Insertthepluginthehole.Removetheboardfromitsseat.
Fixtheboxtothewall,usingthescrewsupplied.
Attachthebracket,thentightenthescrew.
Loosen the nut of the cable grommet, then insert the sensor connection
cableandconnectittotheelectricclamp.
To make the electrical connection between the external sensor and the
boiler,refertothe“Electricalwiring”chapter.
Remember to close the cable grommet properly, to prevent any
humidityintheairgettinginthroughtheopening.
Puttheboardbackinitsseat.
Closetheplasticupperprotectivecoverbyturningitclockwise.Tightenthe
cablegrommetsecurely.
3.5 Condensate collection
The system must be set up so as to avoid any freezing of the condensate
producedbytheboiler(e.g.byinsulatingit).You are advised to install a
special drainage collection basin in polypropylene (widely available on
themarket)onthelowerpartoftheboiler(holeØ42),asshowninFig.12.
Positionthe exiblecondensate drainagehosesuppliedwiththeboiler,
connecting it to the manifold (or another connection device which allows
inspection) avoiding creating any bends where the condensate could col-
lectandpossiblyfreeze.
The manufacturer will not be liable for any damage resulting from the fail-
uretochannelthecondensate,orfromitsfreezing.
Parameters Unit of
measurement
Hot water
circuit
Filling
water
pH value 7–8
-
Hardness °F
-
15–20
Appearance
- clear
The drainage connection line must be perfectly sealed, and well protected
fromtheriskoffreezing.
Before the initial start-up of the appliance, check the condensate will be
properlydrainedoff.
3.6 Gas connection
Before connecting the appliance to the gas supply, check that:
- national and local installation regulations are complied with
- the gas type is the one suitable for the appliance
- thepipingisclean.
Thegaspipemustbeinstalledoutdoors.Ifthepipegoesthroughthewall,
itmustgothroughthecentralopening,inthelowerpartofthetemplate.
Itisadvisabletoinstallalterofsuitabledimensionsonthegaslineifthe
distributionnetworkcontainssolidparticles.
Once the appliance has been installed, check the connections are sealed
accordingtocurrentinstallationregulations.
3.7 Electrical wiring
To access the electrical wiring, proceed as follows:
To access the terminal board:
- turn off the main switch on the system
- undothexingscrews(D)onthehousing(g.13)
- move the base of the housing forwards and then upwards to unhook it
from the chassis
- undothexingscrews(E)fromtheinstrumentpanel(g.14)
- liftthenturntheinstrumentpaneltowardsyou(g.15)
- detachthecoverontheboardcasing(g.16)
- insertthecableofanyroomthermostattobetted.
The room thermostat must be connected as indicated in the wiring dia-
gram.
Low voltage room thermostat input (24V DC).
It must be connected to the mains power supply via a double-pole isolating
switchwithminimumcontactgapof3.5mm(EN60335/1-category3).
The appliance operates with an alternating current of 230 Volt/50 Hz and
an electrical output of 110 W (andcomplieswiththestandardEN60335-1).
It is obligatory to ensure the earth connection is safe, in compliance with
thecurrentdirectives.
The installer is responsible for ensuring the appliance is correctly
earthed;themanufacturerwillnotbeliableforanydamageresulting
from an incorrect or missing earth connection
It isalsoadvisabletorespectthelive-neutralconnection(L-N).
Theearthconductormustbeacoupleofcmlongerthantheothers.
Theboilercanoperatewithaphase-neutralorphase-phasesupply.
For power supplies that are not earthed, it is necessary to use an isolating
transformerwithearthedsecondary.
Donotusegasand/orwaterpipestoearthelectricalappliances.
Use the power cable supplied to connect the boiler to the mains power
supply.Ifthepowercableneedstobereplaced,useacableoftheHAR
H05V2V2-Ftype,3x0.75mm
2
,withamaximumexternaldiameterof7mm.
3.8 Filling the heating system
Oncethehydraulicconnectionshavebeencarriedout,lltheheatingsystem.
This operation must be carried out with cold system, according to the fol-
lowinginstructions(g.17):
- open the automatic air vent by turning the plug on the lower valve (A)
and upper valve (E) two or three turns, to bleed the air continuously,
leave valve plugs A-E open
- ensure that the cold water inlet tap is open
- openthellingtap(externaltothesystem)untilthepressureindicated
bythewatergaugeisbetween1and1.5bar
- closethellingtap.
Note: the boiler is bled automatically via the two automatic bleed valves
A and E, positioned on the circulator and inside the air distribution box
respectively.Ifyou encounter problems bleedingtheboiler,proceedas
describedinparagraph3.11.
3.9 Draining the heating system
Before starting to drain the system, switch off the electrical supply by turn-
ingoffthemainswitchofthesystem.
Close the shut-off devices on the heating system
Manually loosen the system drain valve (D)
3.10 Bleeding the air from the heating circuit and boiler
During the initial installation phase, or in the event of extraordinary main-
tenance, you are advised to perform the following sequence of operations:
1. Use a CH11 spanner to open the manual air vent valve located above
theairdistributionbox(g.18).Connect the tube (supplied with the
boiler) to the valve, so the water can be drained into an external con-
tainer.

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