Morco GB24 - Electrical Supply Safety; Gas Supply Requirements; Condensate Drain Installation; Water System General Guidelines

15
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 IET 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.
If using an off grid electrical supply please consult a suitably
qualied electrician.
4.6 GAS SUPPLY
A propane gas supply at 37mbar is required (30 mbar for DE).
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 2.0mbar 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
Ensure all gas valve connections are gas tight with a gas
soundness check up to the gas control valve.
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 or purpose
designed 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%, giving -22°C protection.
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 24.2 kW (GB24) & 24.2 (GB30) at a 20ºC
differential and ow rate 17.3 l/min (GB24) & 17.3 l/min (GB30) 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 lock/wheelhead shield 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.
Pressure relief 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
(litres) volume (litres)
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
restrictor 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.