Harry Taylor HT2000 User guide

1
INSTALLATION & SERVICING MANUAL FOR
HARRY TAYLOR OIL FIRED CABINET HEATER
WARNINGS
Harry Taylor equipment must be installed and maintained in accordance with the current
OFTEC Regulations for oil fired products. Due account should also be taken of any
obligations arising from the Health and Safety at Works Act 1974 or relevant codes of
practice. In addition the installation must be carried out in accordance with the current IEE
wiring regulations (BS 7671), BS 6896: Industrial & Commercial) and any other relevant
British Standards and Codes of Practice by a qualified installer. All external wiring MUST
comply with the current IEE wiring regulations.
Part No. 701143

2
1 Compliance Notices …………………………………....………..…..…………. 4
1.1 Certificates of Conformity ………………………………..…………..…. 5
1.2 General Product Information …………………………………….…………. 5
1.3 General Requirements ……...……………………………………...………. 5
1.4 Delivery & Pre inspection …………………………………………….…. 6
1.5 Warranty ……………………..…….………………………………………. 6
2 Location & Positioning …………………….………………..…………..…………. 7
2.1 Fuel Supply - General …………..…..……………...………………………. 7
2.2 Fuel ……………...……………………………..……………...……………. 8
2.3 Storage Tank ……………………..…………………….……………….. 8
2.4 Single Pipe System (Gravity Fed) ….…………..………………...………. 8
2.5 Two Pipe System …………………….…………...…………………… 11
2.6 Pressurised Ring Main System ….…………..………………...………. 11
2.7 Pipework and Fittings …………………….…………...…………………… 11
2.8 Electrical Supply ……………...……………………………..………………. 11
2.9 Air Supply ……………………..……………………….……………………. 12
2.10 Air Distribution System…………………………………...……...…………. 15
2.11 Flue System …….…………………………...………………..….……. 16
3 Installation …………………………………………………...…….…….…………. 19
3.1 Packaging & Siting ………………...……………………...……………. 19
3.2 Flooring …………………………………………………..…….....………. 19
3.3 Minimum Clearances ……………………………………...………………. 19
3.4 Assembly ……………………………………………………………..….…. 19
3.5 Flue Installation ……………………………..……..………….……...……. 19
3.6 Oil Installation & Connection ….……………..……………..……...………. 20
3.7 Electrical Installation & Connection….……………………..……...………. 20
3.8 Air Distribution Installation ……………………………….………………. 20
3.9 Warm Air Registers ………………………………………..……………. 21
3.10 Heater Control Installation ……………………………….………………. 21
4 Commissioning ……………..…………………………...…………….…….……. 22
4.1 Pre test …………………………………………………...…..…..………. 22
4.2 Ignition ……………………………………………………….…..………. 23
4.3 Air Delivery System …………………………………....…...…..….……. 24
4.4 Hand Over …………………………………………………...….…...………. 25
5 Servicing …………………………………………………...…………..…………. 25
5.1 Planned Servicing …………………………………....………..………. 25
5.2 Servicing procedure Major Components ….……………………...………. 26
5.3 Service Re commissioning ….…………………………………...………. 28
6 Fault Diagnosis By Flow Chart ………….………………...…….……...……. 30
7 Wiring Diagrams ……………………………………………………...……………. 33
8 Technical Data …………………………………………………...………………. 46
8.1 Reference Documents Standards & Codes of Practice ...……...…… 50
9 Parts Listing …………………………………...………………..……………………. 52
Contents

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10 User Instructions …………………………………………………………...………. 56
10.1 Commissioning/hand over ……………………………….……….……... 56
10.2 Servicing ……………………………….…………………………..…….… 56
10.3 Start up procedure ……………………………….…………….….……. 56
10.4 Stop procedure ……………………………….……………………………. 56
10.5 Shutdown procedure ……………………………….……………...……... 56
10.6 Ventilation only ……………………………….…………………..….…..... 56
10.7 Lockout situations ……………………………….…...………..………. 56
Illustrations
1 Oil Systems ………………………………………………………...……………. 9
2 Flue Systems ………………………………………………………...……………. 17
3 Turbulator positions …………….…………………………………………………. 29
4 Exploded view ……...………………………………………………………………. 51
Any reference made to Laws, Standards, Directives, Codes of Practice or other
recommendations governing the application and installation of heating appliances and
which may be referred to in Brochures, Specifications, Quotations, and Installation,
Operation and Maintenance manuals is done so for information and guidance purposes only
and should only be considered valid at the time of the publication. Harry Taylor of Ashton
Ltd. cannot be held responsible from any matters arising from the revision to or introduction
of new Laws, Standards, Directives, Codes of Practice or other recommendations.
Bio fuel statement.
All our oil fired heater products are configured for
use on both Class D light distillate fuel oil.
As a result of recent changes made to European
legislation regarding the specification of class D
heating oil to allow for the inclusion of 7% FAME
(Fatty Acid Methyl Ester) i.e. bio fuel and
effective from early 2011, all oil fired air heater
products and installations maybe affected.
From April 2011 all our oil fired cabinet
heaters will be fitted with Riello burners which
are bio fuel compatible for blends up to 10%.
Please note that the use of bio fuels may give rise
to a number of installation issues, to both new
and existing plant which could affect the warranty
of the burner. We recommend that you familiarise
yourself with current information from both the
burner manufacturer Riello and OFTEC.

4
1.0 Compliance notices
The following information is relevant to the
Oil fired Cabinet Heater range manufactured
by Harry Taylor of Ashton Ltd.. These
heaters are manufactured within a strictly
controlled quality environment within the
parameters of ISO 9001.
The Harry Taylor Cabinet range has been
tested and assessed for compliance with the
following European Directives.
Machinery Directive: (2006/42/EC)
Low Voltage Directive: (2006/95/EC)
Electromagnetic Compatibility Directive:
(2004/108/EC)
Product Liability Directive: (85/374/EEC)
The manufacturer has taken reasonable and
practical steps to ensure that Harry Taylor
Cabinet Heaters are safe and without risk
when properly used. These heaters should
therefore only be used in the manner and
purpose for which they were intended, and
in accordance with the recommendations
detailed herewith.
The heaters have been designed,
manufactured, assembled, inspected, and
tested, with safety and quality in mind, there
are certain basic precautions which the
installer and user should be aware of, and
they are strongly advised to read the
appropriate sections of the information pack
accompanying the heater, prior to
installation or use.
Harry Taylor of Ashton Ltd. supports all new
products being supplied to their customers
with a comprehensive information pack; this
clearly defines mandatory instructions for
the safe installation, use, and maintenance,
of the appliance (s).
Where proprietary items are incorporated
into Harry Taylor of Ashton Ltd. products,
detailed information and instructions are
also provided as part of the information
pack.
It is the responsibility of the installer, owner,
user, or hirer, of such products supplied by
Harry Taylor of Ashton Ltd., to ensure that
they are familiar with the appropriate
information/manuals, supplied by the
manufacturer, and that they are suitably
aware of the purpose of the manuals and
the safety instructions. In addition, operators
must be suitably trained in the use of the
appliance so as to ensure its continued safe
and efficient use.
Harry Taylor of Ashton Ltd. has a
commitment to continuous improvement,
and therefore reserves the right to amend or
change the specification of the Cabinet
Heater range subject to compliance with the
appropriate European, National, and Local
regulations.
Contained within the text of the manual, the
words 'Caution' and 'Warning' are used to
highlight certain points.
Caution is used when failure to follow or
implement the instruction (s) can lead to
premature failure or damage to the heater or
its component parts.
Warning is used when failure to heed or
implement the instruction (s) can lead to not
only component damage, but also to a
hazardous situation being created where
there is a risk of personal injury.
The Harry Taylor Range of Oil fired Cabinet
Heaters conform to the following
harmonized standards:
BS EN 292-1
Safety of Machinery - Basic Concepts,
General Principles for Design Basic
terminology, methodology
BS EN 292-2
Safety of Machinery - Basic Concepts,
General Principles for Design Technical
Principles and Specifications
BS EN 60204-1
Safety of Machinery - Electrical Equipment
for Machines Specification for General
Requirements
BS EN 60335-1
Safety of Household and Similar Electrical
Appliances General Requirements
BS EN 55014
Limits and methods of measurement of radio
disturbance characteristics of electrical
motor-operated and thermal appliances for
household and similar purposes, electrical
tools and similar electric apparatus

5
BS EN 50165
Electrical Equipment of non-electric heating
appliances for household and similar
purposes, safety requirements
1.1 Certificates of conformity
Certificates are available from the Quality
Control Department at Harry Taylor of
Ashton Ltd.
1.2 General product information
The Harry Taylor models have an output
range from approximately 32.0 kW to
381kW, and are available in a configuration
that will allow for down flow, horizontal, or
floor mounting.
The units can suit either ducted applications,
or be used as free blowing units, but each
heater must be connected to its own
individual open flue
Each heater is fitted with a forced draught
burner which has been test fired and pre-set
prior to despatch. The safety functions of the
burner are by way of a fully sequential
control box fitted to the burner.
Note
Neither asbestos nor soft soldered joints are
used in the construction or manufacture of
the Harry Taylor range of Cabinet Heaters.
The materials selected for use can withstand
the mechanical, chemical, and thermal
stresses which they will be subject to during
foreseen normal use when installed in
accordance with the manufacturers
recommendations.
1.3 General requirements
Caution
Ensure that the fuel supply is in accordance
with the manufacturer's recommendations
and is as stated on the appliance data plate.
Installation, commissioning, and
servicing must only be carried out by
appropriately qualified and competent
persons.
Warning
Unauthorised modifications to the appliance,
or departure from the manufacturers
guidance on intended use, or, installation
contrary to the manufacturers
recommendations may constitute a hazard.
Note
To ignore the warning and caution notices,
and to ignore the advice from the
manufacturer on installation, commissioning,
servicing, or use, will jeopardise any
applicable warranty, moreover, such a
situation could also compromise the safe
and efficient running of the appliance itself,
and thereby constitute a hazard.
The installation of the appliance must meet
all the relevant European, national, and local
criteria. (See sections 3 and 9).
Prior to installation the following points
should be considered;
a) The position of the heater for the optimum
efficient distribution and circulation of warm
air.
b) The position of the heater relative to the
route of the flue.
c) The position of the heater relative to the
supply of fuel.
d) The position of the heater relative to the
electrical services, and if appropriate, any
additional controls.
e) The position of the heater relative to the
supply of fresh air.
f) The position of the heater relative to
service and maintenance requirements.
Caution
The heater must not be installed within an
area where the conditions are unsuitable,
e.g. where the atmosphere is highly
corrosive, has a high degree of salinity, or
where high wind velocities may affect burner
operation. Suitable protection should be
provided for the appliance when it is located
in a position where it may be susceptible to
external mechanical damage from; for
example, fork lift trucks, overhead cranes
etc.

6
1.4 Delivery and pre-installation
checks
The heater is supplied wrapped in heavy
duty protective polythene. On receipt of the
heater, the following checks should be
carried out;
a) The model is as per order
b) That it is undamaged
c) That it is suitable for the fuel supply
d) That it is suitable for the electrical supply
If any of these points are not satisfied then
contact should be made with the Sales
Office at Harry Taylor of Ashton Ltd. as soon
as possible by Telephoning 0161 3084550.
In the case of claims for damage, this must
be signed for as damaged and be reported
in writing within 24 hours of delivery, in order
to comply with insurance criteria.
1.5 Warranty
The heater is supplied with a 1 year parts
and labour warranty and a further year on all
parts excluding consumable’ s.
In addition to this there is also a 10 year
time related warranty on the combustion
chamber.
The warranty commences from the date of
dispatch from the manufacturer, and is
subject to the terms detailed within the Harry
Taylor 'conditions of business'.
Note (i)
The warranty may be invalidated if -
a) The installation is not in accordance with
the general requirements of this manual.
b) The flue arrangement and air supply for
the heater are not in accordance with the
manufacturers recommendations, codes of
practice, or similar standards.
c) Air flow through the heater is not in
accordance with the manufacturers technical
specifications.
d) Internal wiring on the heater has been
tampered with or unauthorised service/
repairs undertaken.
e) The main electrical supply input to the
heater has been interrupted during the
heating mode.
f) The heater has been subject to and
affected by the ingress of water in any form.
g) The heater is not operated at the rating(s)
laid down in the manufacturers technical
specifications.
h) The heater has not been operated or
used within the normal scope of its intended
application.
i) The manufacturer's recommended
minimum service requirements have not
been complied with.
Note (ii)
All warranty claims must contain the
following information to enable processing to
take place;
(1) Heater model.
(2) Heater serial number
(3) Order reference/date of order, together
with full installation details (name and
address)
(4) Details or symptoms of fault
(5) Installers name and address.
Faulty parts must be returned to the Harry
Taylor Spares Department, the address of
which is provided at the rear of this manual.
Any such parts will undergo inspection to
verify the claim.
Replacement parts supplied prior to this may
be charged, and a credit supplied upon
subsequent validation of the warranty claim.
Consumable items are specifically not
included within the scope of the warranty.
Note (iii)
Notification is required immediately a fault is
suspected.
The manufacturer will not accept
responsibility for any additional damage that
has been caused, expense incurred, or
consequential loss resulting from any failure
of the heater(s).

7
Warning
All of the basic criteria must be satisfied
prior to commencing installation and
commissioning, additionally, the Cabinet
Heater must be positioned and installed so
as to comply with all the relevant standards
and guide lines (see section 9.0), as well as
meeting National and Local Fire Regulations
and Insurance criteria, especially if it is
proposed that the heater is to be installed
within a special risk area (e.g. proximity to
where petrol engined vehicles are stored or
parked, where cellulose spraying takes
place, where woodworking machinery is
operated, etc,).
Indirect fired heaters must not be located in
hazardous areas, however, it is permissible
for the heater to supply air to such areas.
The heater must not be installed within an
environment where there is a high
concentration of chlorides, fluorides, salts, or
other aggressive or volatile chemicals/
compounds. Nor should the heater be
positioned where high winds or draughts
could adversely affect the burner.
The location chosen for the heater must
allow for the fitting of an effective flue
system.
The location must also allow for adequate
clearance for the air supply, return air
circulation, oil supply, electrical supply,
whilst also providing good and safe working
access.
The heater must be installed on a flat and
level surface made from non-combustible
material, which is sufficiently robust to
withstand the weight of the heater and any
ancillary equipment. Any combustible
material adjacent to the heater or flue
system must be so placed or shielded so
that its surface temperature does not
exceed 65°C.
In areas where it is proposed that more than
one heater is to be installed, a general
scheme of circulation should be drawn up
and maintained, thereby offering the best
heat distribution.
All Harry Taylor Heaters are fitted with a
pressure relief facility, this is incorporated
into the design of the flue gas exit duct.
Care should therefore be taken in siting
service connections and controls well away
from the pressure relief vent.
Warning
Under no circumstances must the pressure
relief be restricted, blocked, or have the free
exit of exhaust gas impaired or re-directed.
2.1 Fuel supply - general
The Harry Taylor range of oil fired cabinet
heaters are all manufactured and pre-set for
use with 35 second gas oil delivered to the
burner via a suitable piped system from the
oil storage tank.
Galvanised or plastic pipe work and
fittings must not be used. (see BS 5410
Part 1 1997)
The constraints of the application will, to a
large extent, determine whether it is
preferable to use a single pipe gravity feed
system, or whether the two pipe pumped
system is more appropriate.
Where more than one appliance is to share
a common supply it will be necessary to use
a pressurised ring main system.
All pipe work must be constructed and
installed so that it does not permit the
ingress of air.
The construction, size, and position of the oil
storage tank must take account of the
current regulations, as well as suiting the
requirements of the installation.
Please refer to figures 2 - 8 for additional
information.
Caution
On pumped systems always check that the
pump is correctly set up prior to running, and
always ensure that valves are open allowing
a free flow of oil through the system.
2.0 Location/positioning

8
2.2 Fuel
In order to promote trouble free operating it
is necessary that the oil within the storage
tank and oil line does not fall below the cold
filter plugging point (cfpp), in this country
and with class D fuel (also referred to as gas
oil). The critical temperature is -4°C for this
summer grade.
The cfpp critical temperature for the winter
grade is -12°C. If summer grade fuel is
stored for winter use in areas prone to
severe frosts and low temperatures it will be
necessary to insulate or even heat the
supply tank and pipe work.
Note
The fuel supplier should be contacted prior
to installation so that any requirements
concerning delivery, transport, storage and
use can be addressed before work
commences.
Warning
The inlet pump pressure must not exceed a
maximum of 0.4 bar, this is because beyond
this point gas is liberated from the oil.
2.3 Storage tank
An externally painted steel storage tank to
BS 799 part 5 1987 or a medium density
polyethylene oil tank OFTEC certified to
OFS T-100 may be used. Local, national,
European and fire regulations must also be
complied with and must include:
A fuel level gauge (not made from glass) a
vent pipe with a diameter greater than that
of the filler and featuring a weatherproof
termination.
A sludge valve.
An outlet valve situated at the opposite end
of the tank to the sludge valve.
A filler pipe connection situated at the
opposite end to the outlet valve.
The size of the storage tank must take
account of the estimated consumption and
any quantity price breaks offered by the oil
supplier.
It is preferable to install the tank outside,
however, if this is not practicable and the
tank has to be installed indoors advice must
be sought about its siting, especially so far
as fire regulations are concerned.
If a separate fire resistant chamber cannot
be provided for indoor installations, a
catchment pit with a capacity ten percent
greater than that of the storage tank must be
provided
Storage tanks can if necessary be sited on a
roof, but this is subject to special regulations
as well as local authority approval and
compliance with fire regulations, reference
to BS 5410 part 2 1978 & part 1 1997 is
strongly suggested.
It is advisable to leave the tank unpainted on
the inside, but to paint the outside with a
proprietary grade of anti-corrosive paint.
A galvanised or open topped tank is strictly
not allowed.
All oil storage tanks require a bund
The Control of Pollution Regulation (Oil
Storage) 2001 should be consulted prior to
installation.
2.4 Single pipe system (gravity feed)
For installations where the oil tank is 200mm
or more above the level of the fuel pump the
principle of gravity feed may be used.
The draw off point for the supply to the
burner must not be positioned any lower
than 100mm above the bottom of the tank.
Where a return valve is fitted this must be
tamper proof to prevent inadvertent
operation.
Caution
If the valve is closed when the pump is
running the oil pressure can be increased
sufficiently so as to cause damage to the
seals within the pump.
The return oil should preferably be
discharged through an elbow onto a tank
plate situated within the tank, this should be
positioned so as not to introduce air or air
bubbles into the draw off pipe.

9
1 GATE VALV
E
2 IN-LINE FILTER
3 PUMP
4 RELIEF VALVE
5 PRESSURE GAUGE
6 PRESSURE REDUCING VALVE
7 RETURN TO TANK
12
3
45
66
7
Typical arrangement of oil storage tank and single pipe system
Pressurised oil feed system
Burner oil pump details for heater models 30 - 180 oil lines
W
ARNING:
Before starting the burner make sure that the return pipeline is not clogged;
Any obstruction would cause the pump seals to break
H
m
0.5
1.0
1.5
2.0
NOTE:
All burners are despatched suitable for gravity feed installations
FILLER
BURNER
L metres
I.D.
8mm
10.0
20.0
40.0
60.0
I.D.
10mm
20.0
40.0
80.0
100.0
Maximum
4 metres
H
H
(m)
L (m)
I.D.
8mm I.D. 10mm
0.5 10.0 20.0
1.0 20.0 40.0
1.5 40.0 80.0
2.0 60.0 100.0

10
Burner oil pump details for heater models 30 - 180 oil lines
Burner oil pump details 205-375 gravity feed from bottom of tank
BURNER
H
The pump suction must not exceed 4 metres;
beyond this value the pump becomes noisy.
The return valve must termin ate at the same level
as the foot valve, otherwise the pump may
become air locked.
Burner oil pump details 205 - 375 suction feed
BURNER
H
m
0.5
1.0
1.5
2.0
I.D.
8mm
5.0
10.0
20.0
15.0
I.D.
10mm
10.0
20.0
30.0
40.0
H P
The dimension P should not
exceed 4 metres to avoid damage
to the pump seals
H
(m)
L (m)
I.D.
8mm I.D. 10mm
0.5 5.0 10.0
1.0 10.0 20.0
1.5 15.0 30.0
2.0 20.0 40.0
BURNER
H
m
0
0.5
1.0
1.5
2.0
3.0
3.5
I.D.
8mm
35.0
30.0
25.0
20.0
15.0
8.0
6.0
I.D.
10mm
100.0
100.0
100.0
90.0
70.0
30.0
20.0
Maximum
4 metres
H
H
Priming the pump: Start the burner and await priming.
Should lock-out occur prior to arrival of the fuel, wait at least 20 seconds
before repeating the operation.
This solution, however, is less safe than the previous one, due to
possibility of leakage of the valve.
Should, however, the return line terminate over the fuel level,
a n o n re tu rn val v e is es se nti al.
The return line should terminate within the oil tank at the same level
as t he su ction line; i n thi s case a n on ret urn valv e is not requ ired.
The pump suction should not exceed a maximum of 4 metres.
Be y on d th is li mit ga s i s re lease d fro m t he oil .
H
(m)
L (m)
I.D.
8mm I.D. 10mm
0.0 35.0 100.0
0.5 30.0 100.0
1.0 25.0 100.0
1.5 20.0 90.0
2.0 15.0 70.0
3.0 8.0 30.0
3.5 6.0 20.0

11
2.5 Two pipe system
This is used where the oil storage tank is
lower than the pump.
Access for the fuel feed to the burner should
be via a suitable tapping made in the top of
the tank, and the fuel feed pipe should
extend to not less than 100mm above the
bottom of the tank.
A none return valve with a metal to metal
seat should be fitted, especially if the return
pipe work is terminated at a level above the
draw off tube. The non- return valve must be
removable for service and maintenance
purposes, and the return pipe from the
pump must therefore be extended down into
the tank to the same level as the suction
pipe.
The presence of a tamper proof isolating
valve fitted within the return pipe is only
required if there is a risk that oil will siphon
out of the tank if the return pipe is
disconnected at the pump during
maintenance or servicing and if the none
return valve has been omitted.
2.6 Pressurised ring main system
This system is used to supply a number of
units from a common storage tank.
A booster pump is used to provide the
pressure to push the oil around the ring
main and back to the tank.
Pressure reducing valves should be fitted on
the delivery pipe to each heater to ensure
that the pressure at the burner pump is less
than 6 psi.
Caution
The internal by-pass plug must be removed
from the burner pump when used in a
pressurised ring main application.
2.7 Pipe work and fittings
Caution
Galvanised or plastic pipe work and
fittings must not be used. (see BS 5410
Part 1 1997)
All joints must be sealed properly, if
necessary using PTFE tape or other
approved sealing media.
The pipe work must be effectively sealed so
as to prevent the ingress of air.
It is advisable to check all pipe work prior to
installation to ensure that there is no loose
debris or scale present.
Black iron pipes can be hammered to assist
in the removal of these contaminants.
Note
The oil feed to each heater must be fitted
with a fire check valve and isolating valve.
The fire check valve must be operated by
way of a fusible link positioned so that it is
above the burner.
2.8 Electrical supply
Wiring external to the cabinet heater must
be installed in accordance with any local,
national, and European regulations, as well
as meeting the appropriate requirements of
IEE regulations.
The means of connection to the main
electrical supply must allow for complete
electrical isolation of the heater, furthermore,
in the case of a unit wired for a three phase
supply, the supply should only be used to
serve the heater itself and no other plant or
equipment. The position of the isolation
switch must be such that it is adjacent to the
heater and easily accessible at all times. In
addition, the isolator itself must have a
contact separation of not less than 3mm.(as
per BS5991 clause 20.2).
The Control fuse ratings are detailed on the
appliance data plate.
Warning
Ensure that the electric and oil supplies are
turned off before any electrical work is
carried out on the heater.
Ensure that wiring cannot make contact with
any surfaces liable to be subject to high
temperatures or where the insulation of the

12
wiring could be impaired as a result of such
contact.
All cabinet heaters must be earthed.
Caution
The main electrical supply must not be
switched off or disconnected as a method
for stopping the heater, the exception to this
is in an emergency, or during servicing,
when the heat exchanger has been allowed
to cool sufficiently to prevent any damage
from occurring. Claims for damage will not
be considered if they have resulted from
incorrect wiring or the incorrect use of the
heater.
2.9 Air Supply
Provision must be made for the existence of
an air supply in order to satisfy both
combustion and ventilation criteria.
It is a requirement that the area where the
air heater is located must have a permanent
air vent of negligible resistance direct to the
outside air.
Such air vents must be positioned so as not
to become blocked or flooded, nor should
they be placed so as to introduce
undesirable matter (e.g. flammable, volatile,
or aggressive chemicals/compounds or
potentially hazardous or harmful
substances) either direct from the outside, or
through their proximity to an adjacent
extraction system.
Note
It is strongly recommended that BS 6230 :
1991 is referred to for further information
concerning ventilation requirements.
Where mechanical ventilation is used it is a
requirement that the inlet is of the
mechanical type, and the outlet is either
mechanical or natural.
2.9.1 Heaters installed within the
heated space.
Where heaters are installed within the space
to be heated (i.e. not a plant room or
enclosure) then:
Combustion air or heater related ventilation
air will not be required if -
• The design air change rate of the
heated space is 0.5 air changes per
hour or greater or
• The design air change rate may be
satisfied by natural infiltration or by
mechanical ventilation
Combustion and General ventilation will be
required if -
• The design air change rate of the
heated space is less than 0.5 air
changes per hour or
• Where the heated space has an air
change rate of less than 0.5 air
changes per hour then it will be
necessary to provide either natural
ventilation openings to the heated
space (section 2.9.1.1 refers) or the
mechanical ventilation of the heated
space (section 2.9.1.2. refers)
2.9.1.1 Natural Ventilation Openings
to the Heated Space.
If the heated space design air change rate is
less than 0.5 air changes per hour then
provision for low level natural ventilation
openings will only be necessary.
The minimum free area of the low level
natural ventilation opening shall be:
• 2cm2for each kW of rated heat input
The low level natural ventilation opening
should be situated on an external wall and
be within 1000 mm of floor level for natural
gas and ideally at floor level for l.p.g gas
installations but in any event no higher than
250 mm.
The table in the next column provides
specific data for each heater model as -

13
2.9.1.2 Mechanical Ventilation to the
Heated Space.
In the event that the heated space has a
design air change of less than 0.5 air
changes per hour and that installer prefers
to mechanically ventilate the heated space
rather than provide ventilation openings then
-
• The heated space needs to be
mechanically ventilated so that the
design air change is 0.5 air changes or
greater.
• It is a requirement that the mechanical
ventilation shall be of the ‘input’ type
with either natural or mechanical
extraction.
• Systems of mechanical extraction with
a natural inlet shall not be used.
• It is necessary to provide an automatic
means to safely inhibit heater(s)
operation should mechanical air
supply fail for any reason.
2.9.2. Heaters Installed within a Plant
Room or Enclosure.
A plant room means a room housing the
heater plant and probably other items of
building service plant and would generally
have generous space for maintenance.
An enclosure is where the heater is installed
within a compartment or confined area
where space is limited.
Where heaters are installed within a plant
room or enclosure then provision for both
combustion air and air for general ventilation
will be required by means of high and low
level ventilation openings (sections 2.3.2.1
refers to plant room applications and
sections 2.3.2.2 refers to enclosure
applications).
Alternatively the plant room or enclosure
may be mechanically ventilated (section
2.3.2.3 refers).
2.9.2.1 Natural Ventilation Openings
to Plant Rooms
For plant room applications the minimum
free area of ventilation opening shall be:
• At high level 2 cm2for each kW of
rated heat input.
• At low level 4 cm2for each kW of rated
heat input.
The high level ventilation opening should be
sited on an external wall and positioned as
high as is practical and always within the top
15% of the wall height.
The low level natural ventilation opening
should be situated on an external wall and
be within 1000 mm of floor level for natural
gas and ideally at floor level for l.p.g gas
installations but in any event no higher than
250 mm.
The table in the next column provides
specific data for each heater model as -
Minimum Free Area of
ventilation opening
High Level Low Level
cm2cm2
30 None 64
35 None 79
40 None 97
60 None 127
75 None 160
85 None 193
120 None 257
135 None 291
180 None 386
205 None 460
235 None 515
275 None 623
350 None 769
375 None 847
Model

14
2.9.2.2 Natural Ventilation Openings
to Enclosures
For enclosure applications the minimum free
area of ventilation opening shall be:
• At high level 5 cm2for each kW of
rated heat input.
• At low level 10 cm2 for each kW of
rated heat input.
The high level ventilation opening should be
sited on an external wall and positioned as
high as is practical and always within the top
15% of the wall height
The low level natural ventilation opening
should be situated on an external wall and
be within 1000 mm of floor level for natural
gas and ideally at floor level for l.p.g gas
installations but in any event no higher than
250 mm.
The table in the next column provides
specific data for each heater model as -
2.9.2.3 Mechanical Ventilation to a
Plant Room or Enclosure.
In the event that the installer prefers to
mechanically ventilate the plant room or
enclosure rather than provide ventilation
openings then -
• The plant room or enclosure needs to
be mechanically ventilated at the rate
of 4.14 m3/h of fresh air per kW or
rated heat input.
• It is a requirement that the mechanical
ventilation shall be of the ’input’ type
with either natural or mechanical
extraction. Where mechanical
extraction is selected then the
extraction rate should be 5%-10% less
than the input rate.
• Systems of mechanical extraction with
a natural inlet shall not be used
• It is necessary to provide an automatic
means to safely inhibit heater(s)
operation should mechanical air
supply fail for any reason
Minimum Free Area of
ventilation opening
High Level Low Level
cm2cm2
30 64 128
35 79 158
40 97 194
60 127 254
75 160 320
85 193 386
120 257 514
135 291 582
180 386 722
205 460 920
235 515 1030
275 623 1246
350 769 1538
375 847 1694
Model
Minimum Free Area of
ventilation opening
High Level Low Level
cm2cm2
30 159 318
35 198 396
40 244 488
60 317 634
75 400 800
85 483 966
120 643 1286
135 726 1452
180 965 1930
205 1152 2304
235 1287 2574
275 1558 3116
350 1922 3844
375 2118 4236
Model

15
The table below provides specific data for
each heater model as -
2.10 Air distribution system
All materials used within the construction of
the delivery and return air ducts must not
represent a fire hazard and should be made
from thermally inert materials. The selection
of materials must take account of the
environment into which the heater and its air
delivery system is expected to work, it must
also take account of the stresses and
loadings placed upon it during its normal
working life. Where interjoist spaces are
used to route ducting these must be lined
with fire resistant insulation material.
In installations where forced recirculation is
a feature, a full and unobstructed return air
path to the heater(s) must be provided, with
return air grilles connected by ducting
directly to the return air inlet on the heater.
The limit for recirculation should not be
greater than 85% re-circulated air to 15%
fresh air.
Where the heater is installed within a
compartment or plant room the return air
and discharge air arrangement must be
such that the air circulation fan does not
interfere with the operation of the flue.
The return air intake and warm air outlet
should therefore be fully ducted to and from
the heater, respectively, within the
compartment or plant room.
If the inlet air is ducted to the outside, then
the lowest edge of the inlet air duct must be
at least 500mm above the outside floor or
ground level, it must also be fitted with an
access point(s) to allow for cleaning and
servicing to occur.
The openings in the structure of the plant
room, through which the ductwork passes
must be of fire resistant material and
constructed to prevent the likelihood of any
fire from spreading.
In ducted applications the ductwork must be
designed so as to give a static pressure
within the limits stated in section 8 of this
manual. It should be noted that if the static
pressure is too high, nuisance shut-down
will occur when the heater goes out on the
overheat limit thermostat, if the static
pressure is too low, then damage can be
caused to the fan motor.
Warm air outlets on ducted applications
must be such that they cannot be closed or
become blocked, which again would lead to
an increase in static pressure and nuisance
shut-down. The outlets must not be sited so
that warm air can be discharged onto
combustible materials, if necessary, guard
rails should be used to ensure that effected
areas are kept clear.
Return air intakes must not be located so
that potentially harmful or hazardous
contaminated air can be drawn into the
system.
MODEL Mechanical Ventilation Rate for
Plant Room or
Enclosure
35 164
40 202
60 262
75 331
85 400
120 533
135 601
180 799
205 954
235 1066
275 1290
350 1592
375 1753
30 132
M3/h

16
2.11 Flue system.
Warning
It is essential that the products of
combustion are flued to the outside of the
building. Each heater must have its own
separate flue, with a flue diameter of not
less than is detailed in section 8 within this
manual.
The minimum vertical length of flue must not
be less than 3m. The flue should rise
vertically, and the number of bends should
be kept to a minimum.
Flue pipes below a height of 2m should
be guarded against the possibility of
being accidentally touched when hot by
personnel
It is strongly advised that BS 5854; 1980,
and BS 5440; parts 1 and 2, are used as
consultative documents when considering
flue requirements.
Care should be taken to ensure that the flue
terminal is not situated in a high-pressure
area, the proximity of buildings and other
obstacles which will influence this must be
taken into account, preferably at the design
stage. See figures 9 - 19.
Provision must be made for the
disconnection of the flue for inspection and
service requirements, and it is strongly
advised that where bends are fitted
inspection covers are included.
The materials from which the flue is
constructed must be non-combustible,
resistant to internal and external corrosion,
and be capable of withstanding the stresses
and loadings associated with normal use.
When designing the flue system the
prevention of the formation and entrapment
of condensation must be a key
consideration.
Twin wall or insulated systems are
recommended, as they tend to inhibit the
formation of condensates.
Where condensation is unavoidable traps
should be included to encourage the
condensates to flow freely to a point from
which they may be released, preferably into
a gully.
The condensate pipe from the flue to the
disposal point must be made from corrosion
resistant pipe of not less than the internal
diameter of the drain pipe.
If the flue passes through a wall, ceiling, or
roof made from combustible material then it
has to be sleeved so as to provide a
minimum of a 25mm void between the
exterior of the flue and the internal wall of
the sleeve. The maximum permitted
temperature of any adjacent combustible
material is 65oC.
The position of the flue and its terminal
should be such that it does not impair the
combustion process.
It should terminate in an exposed position
so as to allow the escape and dissipation of
flue gases without risk of their re-entering
the property through windows, ventilation
ports, etc. The flue should extend to at least
1m above the height of any object within
3.5m of the terminal.
Flue terminals should be fitted on all flues,
the terminal must be of the approved type,
and have outlet grilles on all sides giving a
total free area of at least double that of the
flue.
Caution
It is imperative that the flue should be
properly sealed where it passes through the
roof, this can best be achieved by using the
approved method of roof flashing plate and
cravat.
Note
It should be noted that claims made under
warranty and attributed to the ingress of
water may not be considered especially if an
approved method of sealing has not been
used, or if the design of the flue has not
made provision for possible condensation
problems.

17
Not less than
600mm
Less than 10 h
Greater than 1500m
m
H1
H2
2
Less than 10 h
1
Flat roof with parapet
Flat roof envelope method
Structure
Not less than
250mm
Grea te r t han 1 0 h
2
Greater than 10 h
1
H1
H2
Struc ture
Flat roof where the flue height is more than 10 Heights (H) away from all structures
Struc ture
Not less than
600mm
Less than 1500mm
Flat roof with flue close to parapet
Not less than
600mm
Not less than
600mm
Greater than 1500mm
Parapet

18
Not less than
600mm
Less than
1500mm
Structure
Flat roof with structure close to flue outlet
Pitched roof not greater than 45°
Not less th an
600mm
Not g reater th an
45
°
Not less th an
600mm
Not less than
600mm
Not less than
250mm
Flat roof with no parapet

19
3.1 Packaging/Siting
The heater will usually be supplied wrapped
in heavy gauge polythene, non assembled
parts will be supplied separately.
Prior to installation, the assembly of the
heater should be completed, it is advisable
that this is undertaken in the area where the
heater is scheduled to be sited.
Caution
It is strongly advised that when positioning
the heater the lifting eyes are used, thereby
reducing the risk of inadvertent damage
being occasioned to the heater.
3.2 Flooring
The heater must be installed on a level non-
combustible surface capable of supporting
the weight of the heater and any ancillary
equipment.
3.3 Minimum clearances
The following minimum clearances (in
millimeters) are recommended when
installing the heater.
3.4 Assembly
The following sub-assembly parts should be
assembled to allow installation to continue.
(a) Vertical Nozzled Models
For free blowing applications it will be
necessary to complete the final assembly
before continuing with the installation. The
bonnet top with nozzle spigots should be
attached to the heater and secured. The
nozzles should then be pushed home on the
spigots and positioned to provide the
desired airflow.
Ensure louvres are adjusted outwards
and ensure blades are not resonating.
The nozzles should be securely fixed in their
desired position on completion of
commissioning.
(b) Horizontal Nozzled Models
Remove packaging and secure the 90°Duct
Outlet to the outlet on the heater using the
bolts supplied.
Secure the nozzle spigot plate to the duct
outlet using the bolts and prevailing torque
nuts provided. Fit the securing brackets to
each of the outlet nozzles, and lift the
complete heater assembly and position on
the pre-sited purpose built supports. Finish
off the assembly by fitting and securing the
outlet nozzles to the spigots by way of
previously fitted brackets.
3.5 Flue Installation
An integral flue spigot is fitted to all Cabinet
Heaters thereby allowing the flue to connect
directly to the heater.
The design of the flue must ensure that it
can be disconnected to allow for cleaning
and servicing, furthermore, all of the flue
section joint sockets must face upwards,
and the seal between the sections achieved
through mechanical joints or through the use
of approved caulking string and grout.
It is strongly advised that BS 5854 and BS
5440 parts 1 and 2 are referred to, see also
figs 9 - 19.
Where condensation is likely to be a
problem provision should be made
preferably at the design stage (see section
2.11).
Model Size Front Rear Lhs Rhs
30 - 40 500 700 150 150
60 - 85 500 1,000 150 150
120 - 135 600 1,200 150 150
180 600 1,500 150 150
205 900 1,500 150 150
230 - 275 900 2,000 400 400
350 - 375 900 2,000 500 500
3.0 Installation

20
3.6 Oil Installation/connection
The oil tank must be positioned so that there
is a fall of 7.5mm (+/- 2.5mm) for every
30mm away from the outlet and towards the
sludge/drain valve, which must be sited at
the lowest point in the tank. If the tank is
positioned on supports then there must be
an adequate protective layer between tank
and support to prevent damage or
deterioration through corrosion. It is strongly
suggested that reference is made to BS
5410 ; part 2 ; 1978.
It is also suggested that the installer is
familiar with the detail and requirements
contained within sections 2.1 through to
section 2.6 of this manual prior to
commencing installation.
Warning
Prolonged exposure and contact with Gas
Oil can result in the natural oils being
removed from the skin, sensitisation can
result in dermatitis.
Always ensure that the appropriate personal
protective equipment is used.
3.7 Electrical Installation/connection
Harry Taylor cabinet heaters are available
either for 415V 50Hz 3PH or 230V 50Hz
1PH supplies depending upon the model
specified.
It is recommended that reference is made to
the wiring diagrams contained within section
7 of this manual prior to installation or
connection to the supply. The electrical
supply must be as specified and suitable for
the heater, and must be run within conduit to
a point adjacent to the heater, and be
terminated to provide an isolation point that
will prevent remote or inadvertent activation.
Cables, conduit, and fittings that are used to
make the connection between the isolator
and the heater must conform to the
appropriate IEE regulations.
All heaters are supplied fused and pre
-wired, all must be earthed.
Final connections for any additional external
controls must be completed on site, and
must be carried out according to IEE
regulations.
Separate user information is provided for the
time control unit and the burner, and forms
part of the product information pack which
accompanies every heater when
despatched.
Warning
Always isolate from mains electrical supply
before commencing work on the heater.
Always ensure that the appropriate personal
protective equipment is used.
3.8 Air Distribution Installation
The materials selected must be of low heat
capacity, and it is preferable that all warm air
ductwork is thermally insulated.
Where ducting may be subject to
deterioration from exposure to moisture or
high humidity material selection and
insulation are prime considerations. Joints
and seams must be airtight and fastened
securely and designed to remain so, even
when operating at high temperatures.
Adequate support must be designed into the
layout of the ductwork to ensure that the
integrity of the seams and joints is
maintained.
The support must be independent and
separate from the heater and the ducting, to
allow for free movement during expansion
and contraction.
Where ducting passes through walls or
partitions sufficient clearance must be left,
irrespective of any fire stop requirement, to
allow for expansion and contraction. Failure
to adhere to these latter two points can
result in the generation and transmission of
excess noise.
Where ducting is installed in concrete
flooring a permanent membrane must be
used to isolate the ducting from the
corrosive effect of the alkaline salts within