Good Practices for Equipment GHS Vol 11 (size 67.1 KB)

Good Practices for Equipment GHS Vol 11 (size 67.1 KB)
Issue 11, April 2009
Good Practices for Equipment & Installers
The Installers’ Newsletter
Greener Homes Scheme
Bulk Fuel Storage
Phase III of the Greener Homes Scheme has been in
operation since the 22nd of July 2008. Eligibility for the
Phase III is restricted to existing dwellings only, i.e. must
be occupied for at least 1 year and it must have an
existing heating system. Please ensure you clarify what
age the dwelling is when completing page 2 of the
commissioning report.
Bulk Fuel Storage for pellets is mandatory for the
installation of a biomass boiler. Bulk fuel storage ensures
that the quality of the wood pellets is maintained and the
homeowner can take advantage of the significant
savings of purchasing wood pellets in bulk. Bulk fuel
systems can be purchased off the shelf or self-installed. If
self-installing the homeowner should reference the
Austrian standard ONORM M7137 ‘Requirements for
storage of pellets at the ultimate consumer’. Bulk fuel
storage must be installed at time of system
commissioning. It is not sufficient to write on the
commissioning report that the unit will be built by the
homeowner at a later stage.
Biomass Appliances
Ventilation
Ventilation is necessary to provide a healthy and
comfortable internal environment for the buildings
occupants and is necessary for the air supply of open
flued combustion devices.
As per Technical Guidance Documents J ‘any room or
space containing an appliance should have a ventilation
opening (or openings) of at least that size shown in table
1’.
Wood Pellet Quality
Good quality pellets are essential to ensure clean
combustion and trouble-free operation of the biomass
appliance. Please direct the homeowners to purchase
pellets that are supplied with a quality mark and
complete fuel analysis. Common standards for wood
pellets include ONORM M7135 (Austria), SS 198710 & SS
18721 (Sweden), DIN 51731 (Germany) and Premium
Grade (USA & Canada).
A list of known wood fuel suppliers in Ireland is available
on our website at
http://www.sei.ie/Grants/GreenerHomes/Wood_Pellet_F
uel_Information/MASTER_COPY_OF_wood_fuel_supplie
rs.pdf
Heatpumps
During recent inspections of biomass appliances it has
been noted that in some cases sufficient ventilation has
not be supplied for the appliance. It is important to
ensure that adequate ventilation is in place for the size of
appliance being installed before commissioning the
system. Commissioning the system based on the
homeowner installing ventilation at a later date is not
acceptable.
Correct sizing of a heatpump is imperative to ensure the
heating system runs efficiently for the homeowner. The
most important first step is the accurate calculation of
the house heat loss, its related energy consumption
profile and the domestic hot water requirements. Oversizing of the heatpump will increase the period of
operation under part load as well as the capital cost.
Under-sizing the heatpump will require top up heating,
usually from a direct electric source. Both of these
situations will increase the cost for the end user.
When installing a heat pump into an existing dwelling it
is critical to ensure that the building is sufficiently
insulated and the existing heating system is surveyed
for compatibility. In many cases the dwelling’s fabric will
need to be upgraded to ensure efficient operation and
thus minimise energy spend. It is recommended to try
and achieve insulation levels as close to “new build”
Sustainable Energy Ireland, Greener Homes Scheme, Glasnevin, Dublin 9.
T: 1850 734 734, F: (01) 808 2013
Web: www.sei.ie/grants/greenerhomes
Email: [email protected]
requirements,
where
possible
and
practical.
Recommended values for average elemental U-value for
insulation would be:
• Roofs
0.16 W/m2K
• Walls
0.27 W/m2K
• Ground Floors
0.25 W/m2K
• Exposed Floors
0.25 W/m2K
• External doors windows/roof-lights:
2.0 W/m2K
SEI launched a new scheme in March called the Home
Energy Saving (HES) scheme that gives grant aid
towards energy saving measures in the home including
roof and wall insulation, among other measures. More
details are available at www.sei.ie/hes
For more information see Technical Guidance Document
L – Conservation of Fuel and Energy – Dwellings
http://www.environ.ie
Air Source Heatpumps
Air source heatpumps achieve on average 10-30% lower
seasonal performance than water source heatpumps. This
is due to a rapid fall in capacity and performance with
decreasing outdoor temperature, the high temperature
difference in the evaporator, the energy needed to defrost
the evaporator and the energy needed to operate the fans.
Because of Ireland’s humid climate, frost can accumulate
on the evaporator surface when the temperature drops
below 7°C, resulting in reduced capacity and performance
of the heatpump. Energy consumption increases and the
overall Coefficient of Performance or CoP of the heatpump
drops with increasing defrost frequency. This has been
noted during the latest cold spell, and so due consideration
should be given to sizing the heatpump for these
conditions.
Solar
Commonly found faults and solutions
Overflow / vent pipe from safety value is not routed
to drainage, ground or vessel.
• A steel container (not galvanised) is the safest
option, but plastic vessels can be used provided the
pressure relief valve is located in the return pipe, not
the flow and not immediately beside the solar panel.
Installers should make sure the vessel is fixed in
a way it cannot be knocked over accidentally.
.
Maximum Cylinder Temperature at 60°C
• Prior to setting the maximum cylinder temperature
you should determine whether the local water is
hard or soft In the case of soft domestic water, it
should be raised to 750C approximately if sensed at
bottom of cylinder, or 900C approximately, if sensed
at top of cylinder (mixer valve recommended). In the
case of hard water, the setting may be left as it is.
Electrical Installation – PVC wiring is in contact with
hot pipework or system does not have a permanent
power supply,
• Wiring is secured in trunking or with clips; solar
system has a permanent power supply.
Solar loop pipework insulated with low temperature
insulation that melts over time.
• High temperature insulation must be used
General Notes
Electrical Bonding of Pipework
As per the ETCI Wiring Regulations 544.1.1 ‘Main bonding
conductors shall connect extraneous conductive parts of
the main engineering services in a building, such as pipework for gas, water, and central heating and ducting for
air conditioning, to the main earthing terminal’.
Therefore it is necessary that pipework for the central
heating system is bonded. This should be in-situ at time
of system commissioning and should be completed by a
RECI electrician.
GHS Standard Commissioning Reports
We will only accept Version 5.0 of the commissioning
reports for biomass, solar and heatpump installations.
Sending in the incorrect version of the commissioning
report will only delay the payment process for the
homeowner.
Tax Clearance Certificate / C2 Card
To maintain your inclusion on the Registered Installer List
you must provide SEI with an up-to-date TCC or C2 card.
You will be reminded by post one month in advance and
by phone one week in advance of expiry of your tax
details. You will be given a few days grace to furnish valid
tax details to SEI. You will be removed from the list until
such a time as new details are provided and we will be
unable to process new applications or request for
payments.
Your TCC or C2 card must be provided in the name,
under which you wish to register. Personal TCC’s cannot
be used to register multiple people.
Homeowners; Training & Documentation
Homeowners should be thoroughly trained in the use of
their renewable energy system to ensure it runs at
optimum performance. Any changes in set-up of the
existing heating system (during integration) shall be
notified to the homeowner. System documentation and
user manuals shall be provided to the homeowner. The
homeowner
shall
be
provided
with
a
maintenance/service schedule for the system and shall
be provided with a written warranty for the product. If
you change your contact details please let the
homeowner know so you can be contacted should there
be any issues with the system.
Sustainable Energy Ireland, Greener Homes Scheme, Glasnevin, Dublin 9.
T: 1850 734 734, F: (01) 808 2013
Web: www.sei.ie/grants/greenerhomes
Email: [email protected]
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