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Morco GB30 SII Manual

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13
SECTION 4 - gENEral INSTallaTION rEquIrEmENTS
4.4 AIR SUPPLY
It is NOT necessary to have a purpose provided air vent in the
room or internal space in which the boiler is installed. Neither is
it necessary to ventilate a cupboard or compartment in which the
boiler is installed, due to the low surface temperature of the boiler
casing during operation.
4.5 ELECTRICAL SUPPLY
WARNING
This appliance MUST be earthed.
Wiring external to the boiler MUST be in accordance with the
correct IEE Regulations and any local regulations.
Theboilerhasbeenpre-ttedwitha3ampfusedapproved
moulded3pinplugandyinglead,forusewith230V50Hz.
The plug should be used with an unswitched/shuttered socket
outlet complying with BS1363.
4.6 GAS SUPPLY
A propane gas supply at 37mbar is required.
Ensurethatregulatorisofsufcientcapacitytocarrythe
maximum boiler input plus the full demand for any other installed
appliances.
Ensure the connection between supply/cylinder to caravan holiday
home or park home is designed so that no pressure drop occurs.
Ensurethepipeworkisofsufcientsizetopreventapressure
dropgreaterthan2.5mbarbetweenthenalpressureregulatorto
the caravan holiday home or park home and all appliances when
the installation is subjected to the anticipated maximum load.
IMPORTANT
The complete installation MUST be tested for gas soundness.
4.7 CONDENSATE DRAIN
A condensate drain is provided on this boiler.
The drain MUST be connected to an approved drainage point.
AllpipeworkandttingsMUSTbemadeofplastic.Noother
materials may be used.
Suitable protection against freezing should be undertaken.
4.8 WATER SYSTEMS - GENERAL
This boiler is designed for connections to fully pumped sealed
system only.
IMPORTANT - A minimum length of 1 metre of copper pipe
MUSTbettedtobothcentralheatingandDHWowandreturn
connections from the boiler before connection to any plastic piping.
Central Heating System
IMPORTANT-Thesealedcentralheatingsystemmustbelled
at all times with an antifreeze / inhibitor and water mix that is
compatible with aluminium heat exchangers. The concentration
levelsoftheantifreeze/inhibitorshouldbeatleast25%inorder
to provide adequate corrosion protection. This level also provides
protection against frost from -7.5ºC to -11ºC (depending on the
product used). The maximum allowable level of antifreeze /
inhibitorisaround40%.
The only products approved are as follows:
- Fernox Alphi 11
- Sentinel X500
Failure to use these products may result in damage to the boiler
and / or the radiators in the heating system.
4.9 REQUIREMENTS FOR SEALED WATER
SYSTEMS
AtmaximumCHoutput24.24kWata20ºCdifferentialandow
rate 17.3 l/min a 3.4m wg head is available for the system
Set all radiators to give around 20ºC temperature differential.
The boiler does not normally need a bypass but at least some
radiatorsofloadatleast10%oftheminimumboileroutput.
Theseradiatorsshouldbettedwithlockshieldvalvesonly.
AsealedsystemMUSTonlybelledbyacompetentpersonusing
anapprovedllingloop(orotherapprovedmethod)betweenthe
mains water supply pipe and the central heating return pipe.
Onceused,thellingloopshouldbedisconnectedandcappedoff.
4.10 EXPANSION VESSEL
Theboileristtedwithan8litreexpansionvesselwhichis
sufcientforacoldllcapacityofupto143litres.
For other system volumes refer to table below.
Safety valve setting bar 3.0
Vessel charge pressure bar 0.5 to 0.75
System pre-charge pressure bar None 1.0
System volume Expansion vessel
 
25 1.6 1.8
50 3.1 3.7
75 4.7 5.5
100 6.3 7.4
125 7.8 9.2
150 9.4 11.0
175 10.9 12.9
190 11.9 14.0
200 12.5 14.7
250 15.6 18.4
300 18.8 22.1
For other system volumes
multiply by the factor across 0.063 0.074
4.11 PRESSURE RELIEF VALVE
Apressurereliefvalvesetat3baristtedtotheboiler.The
connection is shown in the dimensions and connection details.
The discharge pipework must be suitable for use with 3bar water
at 110ºC without damage to property and persons.
The run and exit point of the pipework should not leave a hazard
or be prone to freezing up.
4.12 DHW SYSTEMS
Check that the mains supply pressure is within the units stated in
the technical data section in this manual
Apressurereducingvalveshouldbettedifabove10bar.
In areas of low mains water pressures the domestic hot water
regulatormayberemoved(byasuitablyqualiedperson).The
boilerwillrequiretheowratetobesettogiveatemperatureof
35ºC at the tap furthest from the boiler.
In hard water areas where mains water exceeds 200ppm total
hardness,thettingofascalereducingdeviceisrecommended
(with the requirements of the local water company).
Theuseofarticiallysoftenedwater,however,isnotpermitted.
The boilers are suitable for connection to most types of washing
machine and dishwasher appliances.
… 13 …


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