Welcome!
© HETAS 2015 H008
HTU13
Pellet stove Sizing, Selection, Installation,
Commissioning & Decommissioning
© HETAS 2015 H008
Introduction
•
The learning outcomes for HETAS Unit HTU13C - Dry Pellet
Stove Appliance Sizing, Selection, Installation, Commissioning
& Decommissioning are:
• Know dry pellet stove types and operating
principles.
• Be able to select a dry pellet stove appliance.
• Know dry solid fuel appliances installation
requirements.
• Know the commissioning and handover
requirements of dry pellet stove appliances.
© HETAS 2015 H008
Introduction
•
The learning outcomes for HETAS Unit HTU13C - Dry Pellet
Stove Appliance Sizing, Selection, Installation, Commissioning
& Decommissioning are:
• Be able to inspect an installed dry pellet stove
appliance to determine if commissioning can go
ahead.
• Know the service and maintenance
requirements for dry pellet stove appliances.
• Know the fault diagnosis and rectification
procedures for dry pellet stove appliances.
© HETAS 2015 H008
Pellet Stoves
• The appliances discussed
in this manual are
compliant with EN 14785
and a minimum efficiency
of 65% part load - 70%
nominal load.
Reference - 'Domestic Building
Services Compliance Guide
2010', Table 18.
© HETAS 2015 H008
Renewable Heat Incentive & Microgeneration
Certification Scheme Requirements
• Pellet stoves with boilers are eligible for
RHI payments where the appliance and
the installer is MCS approved in
accordance with ‘Microgeneration
Installation Standard’ MIS 3004.
• ‘Requirements for MCS Contractors
undertaking the supply, design
installation, set to work,
commissioning and handover of solid
fuel heating systems'
© HETAS 2015 H008
Microgeneration Certification Scheme
Registration
• Successful completion of this course together
with a wet competency such as is awarded on
completion of the HETAS H004 Wet Appliance
Installer course may provide a pathway for
limited scope MCS certification. Installers
wishing to pursue MCS registration in mind of
the Renewable Heat Incentive may seek further
information, guidance and MCS registration
through HETAS.
© HETAS 2015 H008
Why Choose a Pellet Stove?
• High efficiency.
• Highly controllabe.
• Automated - little consumer interaction
required.
• Convenience of fuel availability.
• Low ash content.
• No need to open combustion chamber
during normal operation therefore spillage
flue gases is not an issue.
© HETAS 2015 H008
Why Choose a Pellet Stove?
• Many are exempt appliances and as such
are suitable for installation in Smoke
Control Areas when using specified fuel.
• Many are freestanding and as such do not
require a recess or builder's opening for
their installation.
• Pellet appliances include several modern
and stylish designs.
© HETAS 2015 H008
Certified Pellet Fuel
• Pellet stove manufacturers will specify the
appropriate fuel to be burned in their
appliance. It is likely they will refer to fuel
standards such as EN 14961-2, or ISO
17225-2, or ENplus. These standards
specify the physical and property
characteristics of pellet fuel to ensure the
pellet appliance operates efficiently and
effectively.
© HETAS 2015 H008
Wood Pellet Schemes - ENplus
• Fuel quality is decisive for the optimal
operation of a pellet stove. For use in
private households many appliance
instructions will recommend using ENplus
A1 certified pellets.
© HETAS 2015 H008
Wood Pellet Schemes – Woodsure Plus
• In conjunction with Woodsure HETAS certify
producers that meet high standards in the
production of firewood, briquettes, wood chip and
pellets. Refer to Part 3 of The Official Guide to
HETAS Approved Products & Services for a list of
approved biomass producers, including pellet
suppliers.
© HETAS 2015 H008
Wood Pellet Schemes
• ENplus and Woodsure Plus certified by
HETAS pellets will carry one or both of the
previous logos on their packaging. You
should advise your customers to look out
for them.
• HETAS produce consumer advice leaflets
on fuel quality, operating a stove and CO
awareness amongst others. These are
free to download from the HETAS website
or available in printed form for registrants
in the HETAS online shop.
© HETAS 2015 H008
Pellet Storage
When discussing the installation of a pellet-fuelled
appliance with the customer consideration should be
given to the following:
• the economical delivery of pellets (blown/bagged)
• for blown delivery a dedicated area for a fuel store
will be required.
• access for potentially large delivery vehicles to the
property
• dry secure storage of fuel
• the consumer’s ability to convey bagged pellets
from storage to the appliance.
http://www.pelletcouncil.org.uk/news/new-video-doing-woodpellets-right
© HETAS 2015 H008
Pellet Storage
• Large separate hoppers
and silos are discussed in
the manual for Unit
HTU01K.
• Most dry pellet stoves as
covered in this unit will
feature an inbuilt storage
hopper typically with
capacity to hold 15-50kg
of pellet fuel.
© HETAS 2015 H008
Pellet Storage
• For freestanding
stoves loading of the
pellet hopper is
relatively
straightforward and
involves lifting the
hopper cover and
pouring in the pellets
either, directly from
the bag (Figure 9) or
using a fuel shovel.
© HETAS 2015 H008
Dry Pellet Fuel Appliance Selection
HETAS approved dry pellet stove appliances
are listed in The Official Guide to HETAS
Approved Products & Services under the
following category:
• Type E4 – Wood Pellet Stoves.
© HETAS 2015 H008
Dry Pellet Fuel Appliance Selection
The selection of any dry solid fuel appliance
including pellet-fired appliances should be
made after taking into account:
• The customer’s stated
preferences/requirements
• Regulatory requirements
• Room heat requirements
• Appliance manufacturer’s requirements
including flue specification
• Access for both maintenance and fuel
delivery
© HETAS 2015 H008
Dry Pellet Stove Types & Operating Principles
• Dry pellet stove are available in a range of
styles and types that includes inset and
freestanding options (see Figures 6 & 7.)
© HETAS 2015 H008
Figure 8 (p9)
1.Pellet burner bowl/crucible
2.Ash pan
3.Combustion chamber
4.Flame temperature sensor
5.Safety temperature limiter
6.Pellet hopper
7.Control panel
8.Pellet feed system
9.Remote sensor (if fitted)
10.Modem (if fitted)
11.Automatic ignition system
12.Exhaust gases
13.Air Intake
14.Combustion air fan
© HETAS 2015 H008
Figure 10 (p10) Inset with frontal feed tray
1.Pellet burner
bowl / crucible
2.Outlet from
pellet feed
system
3.Frontal pellet
feeding tray
4.Pellet hopper
© HETAS 2015 H008
Pellet Feed System
Source : Palazzetti via Poujoulat
© HETAS 2015 H008
Pellet Feed System
Source : Palazzetti via Poujoulat
© HETAS 2015 H008
Pellet Stove Components
•
•
•
•
Combustion Chamber
Pellet Feed System
Pellet Feed System - Top feed
Pellet Feed System – Bottom Feed
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Pellet Feed System – Bottom Feed
Bottom feed
auger system
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Pellet Stove Components
• Combustion Air Fan
• Automatic Ignition System
• Control Panel
© HETAS 2015 H008
Figure 12
1. Pellet hopper
2. Screw feed
3. Air lock (back
burn protection)
4. Discharge chute
5. Igniter
6. Forced air
induction
7. Ash collection
8. Fire grate
9. Secondary
combustion
chamber
10. Air wash
© HETAS 2015 H008
(courtesy Euroheat)
Other Features
???
•
•
•
•
•
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Air wash glass cleaning system
Ducted air distribution
Direct Air Supply
Fan assisted convective heat
Flue gas outlet safety device
Other Features
???
• Overheat protection
• Low temperature protection
• Automatic tipping grate.
• Ash compactor
• Safety features on doors
.i.e. microswitch
© HETAS 2015 H008
Power Failure
• In the event of power failure the appliance
will shut down as no fuel can be delivered
and fan will not be operational for
combustion to take place
• Appliance restart after a power failure is
normally automatic.
© HETAS 2015 H008
Pellet Stove Installation
Pre-installation Checks
• Electrical Work - Much electrical work is
notifiable and as such anyone carrying out
electrical work in relation to the installation
should be deemed competent under Part
P of the Building Regulations.
© HETAS 2015 H008
Pellet Stove Installation
Pre-installation Checks
• Once the appliance is selected, HETAS
recommends that pre-installation checks
should be carried out in order to determine
if the proposed installation will be
compliant with relevant regulatory
requirements and the appliance
manufacturer’s installation requirements.
As a minimum the pre-installation checks
listed in Table 2 are recommended.
© HETAS 2015 H008
Pellet Stove Installation
© HETAS 2015 H008
Pellet Stove Installation
© HETAS 2015 H008
Pellet Stove Installation
© HETAS 2015 H008
Pellet Stove Installation
© HETAS 2015 H008
Pellet Stove Installation
• The appliance must be installed in
accordance with the Building Regulation
requirements and with due regard to the
manufacturer’s instructions (Refer to the
HETAS manual for Unit HTU03K). In this
section we examine a cross-section of
installation requirements that may be
applicable.
© HETAS 2015 H008
Connection of the Appliance to the Chimney
• Many pellet stoves have a low level rear
flue outlet with a diameter in the range 80100mm. The appliance manufacturer
may specify that the appliance is fitted with
a standpipe and connecting flue pipe (see
Figure 13).
© HETAS 2015 H008
Connection of the Appliance to the Chimney
Alternatives?
© HETAS 2015 H008
Connection of
the Appliance
to the
Chimney
© HETAS 2015 H008
Connection of
the Appliance to
the Chimney
© HETAS 2015 H008
Commissioning & Handover
• Commissioning is carried out when the
installation is practically and technically
complete and will include the whole
installation. It is the final and important
stage prior to handover of the installation
to the homeowner or end user.
© HETAS 2015 H008
Commissioning & Handover
Within this section we consider:
• The documentation required for
commissioning to proceed.
• Pre-commissioning check requirements.
• Typical commissioning requirements
• Typical handover requirements.
• Equipment required for commissioning
Refer to p2 of the MCS Handover document
for eligible installations.
© HETAS 2015 H008
Documentation Required for
Commissioning to Proceed
The typical documentation that needs to be
available to enable commissioning work to
proceed is:
• The appliance manufacturer’s
commissioning instructions.
• A blank commissioning record and
checklist (unless included in the appliance
manufacturer’s commissioning
instructions). An example basic
commissioning checklist is provided in the
HETAS training manual for Unit HTU03K.
© HETAS 2015 H008
Pre-Commissioning Check Requirements
• HETAS recommends that a number of
checks are carried out prior to
commissioning
• This is particularly important if the
installation has been undertaken by other
personnel.
• Table 3 identifies a number of typical precommissioning check requirements.
© HETAS 2015 H008
Pre-Commissioning Check Requirements
© HETAS 2015 H008
Pre-Commissioning Check Requirements
© HETAS 2015 H008
Pre-Commissioning Check Requirements
© HETAS 2015 H008
Commissioning Requirements
• The commissioning of a dry pellet stove
must be undertaken in accordance with
manufacturer’s instructions and relevant
regulatory requirements.
• Including completion of Manufacturers
commissioning document.
• Table 4 details the typical commissioning
requirements.
© HETAS 2015 H008
Commissioning Requirements
Information required for commissioning to
proceed:
• Manufacturer’s data and instructions
• Access to controls to check preset values
• Error codes and their meanings
© HETAS 2015 H008
Commissioning Requirements
© HETAS 2015 H008
Commissioning Requirements
• In the event that commissioning cannot be
correctly completed, reference should be
made to the HETAS unsafe situations
procedure and where relevant the
procedure should be followed.
• Refer to the HETAS manual for Unit
HTU03K for guidance.
© HETAS 2015 H008
Commissioning Requirements
• Where required by the Building
Regulations, the relevant building control
authority must be notified of the
commissioning of a solid fuel appliance.
This can be completed by a Competent
Person registered with HETAS.
• The HETAS manual for Unit HTU03K
provides guidance on Building Regulations
notification requirements and available
options and procedures for providing
notification.
© HETAS 2015 H008
Installation Handover
The handover of a dry solid fuel appliance
installation will typically involve discussion
and provision of written information and a
demonstration to the customer or the
customer’s representative to include, as a
minimum, the following:
• Explanation of each item of documentation
provided (user instructions, commissioning
certificate, warranty document etc.)
• Details of suitable pellet fuel including
Enplus bagged delivery
© HETAS 2015 H008
Installation Handover
• Demonstration of how to load the
appliance with pellet fuel
• Demonstration of appliance light-up and
shut-down procedures
• Demonstration of how to set/adjust
appliance controls
• Details of cleaning/maintenance that
needs to be undertaken by the appliance
user
© HETAS 2015 H008
Installation Handover
• Details of the required frequency for
sweeping of the chimney (Refer to the
HETAS manual for Unit HTU05C for
guidance).
• Details of potential error codes, their
meaning and actions to be taken
• Advice on the importance of appliance
lockout and recognising the reasons
before attempts to reignite or overriding
error messages
© HETAS 2015 H008
Installation Handover
• Details of the appliance maintenance that
needs to be undertaken by a competent
person.
• What to do in the event of an emergency
or perceived emergency (e.g. activation of
the CO alarm* or a chimney fire**).
*Refer to the HETAS manual for Unit HTU01K for
guidance
** Refer to the HETAS Guide (Part 4) for guidance
© HETAS 2015 H008
The Importance of Notice Plates
• It is a legal requirement for you to affix
a notice plate when you complete an
installation. (J5)
• Failure to do this makes it a
NON-COMPLIANT
INSTALLATION!
© HETAS 2015 H008
CO Detectors/ Alarms
• It is also a legal requirement for you to
install a CO Detector/Alarm.
IN THE SAME ROOM AS THE APPLIANCE
(refer to Unit 1, page 37)
Failure to do this…..
….you guessed it!
© HETAS 2015 H008
Notification via Competent Person Scheme
Certificate
of
Compliance
© HETAS 2015 H008
On Line Notifications via HETAS
• Save time, notify online.
© HETAS 2015 H008
Installation Handover
• In addition, installers may wish to offer an
annual service contract as part of the
handover process to ensure ongoing
appliance safety and efficiency. With this in
mind HETAS produce a variety of
supporting documents for its registrants
including the below, where a copy can be
left with the homeowner, servicing installer,
and tenant if applicable.
© HETAS 2015 H008
Installation Handover
.
© HETAS 2015 H008
Dry Pellet Stove Service & Maintenance
Main factors that have contributed to serious
incidents are:
• Blocked flue
• Leaking flue/chimney structure
• Lack of or insufficient permanent ventilation
• Lack of appliance cleaning and maintenance
including blocked flue ways within the appliance
• Poor quality fuel
• Poor installation practice
© HETAS 2015 H008
Dry Pellet Stove Service & Maintenance
It is therefore essential that routine servicing
of any dry solid fuel appliance includes
inspection and/or testing to check the:
• Condition of the chimney structure/flue
• Permanent ventilation to the appliance
• Overall installation of appliance in relation
to manufacturer’s instructions
• Overall installation of appliance in relation
to applicable regulatory requirements
© HETAS 2015 H008
Dry Pellet Stove Service & Maintenance
• Evaluation of use and maintenance carried
out by the customer
• Routine service and maintenance of the
appliance must always be carried out by a
competent person in accordance with the
appliance manufacturer’s requirements.
• Further guidance on page 23 HTU13
© HETAS 2015 H008
Dry Pellet Stove Service & Maintenance
• The service intervals should be as stated by
the appliance manufacturer.
• Where no service interval is given by the
appliance manufacturer HETAS recommends
that routine servicing of the appliance / Flue/
Chimney is undertaken at least once a year.
© HETAS 2015 H008
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Fault Diagnosis & Rectification
As with routine service and maintenance,
fault diagnosis and rectification of the
appliance must always be carried out by a
competent person in accordance with the
appliance manufacturer’s instructions.
© HETAS 2015 H008
The typical requirements for routine service and
maintenance of pellet stove are:
Group Activity
• Compile a list of the typical requirements for
servicing and maintenance.
• 15 minute activity without the use of
reference material.
© HETAS 2015 H008
Fault Diagnosis & Rectification
The diagnosis process may require some or all of
the following activities to be undertaken:
• inspecting and testing of the chimney/flue
system provision and operation
• checking the permanent air supply provision
• inspection/cleaning/testing of appliance
components
• Review of error codes and their meanings
© HETAS 2015 H008
© HETAS 2015 H008
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Dry Pellet Stove Decommissioning (p30)
Decommissioning of a dry pellet appliance
may be required:
• To enable servicing and maintenance work
(temporary decommissioning); or
• Because the appliance has reached the
end of its useful life, become obsolete or is
inefficient; or
• Beyond economic repair (permanent
decommissioning).
© HETAS 2015 H008
Safe Electrical Isolation
• Prior to the
commencement of routine
servicing and maintenance
or fault diagnosis and
rectification work on a solid
fuel appliance there is a
need to safely isolate the
appliance from the
electricity supply.
© HETAS 2015 H008
Examples of where full re-commissioning is
required include, but are not limited to:
• Repairs to the appliance chimney or flue
including the replacement of, or alteration
to, any connecting flue pipe;
• Alterations to the appliance permanent air
supply;
• Repairs following the activation of a CO
alarm;
• Repairs following a chimney fire.
• Persistent error codes
© HETAS 2015 H008