Grant Vortex VTXBH1521 User guide

UK | DOC 0116 | Rev 1.1 | November 2017
Grant Vortex
Boiler House Floor Standing Condensing Oil
Boiler Range
Installation and Servicing Instructions

GRANT ENGINEERING (UK) LIMITED
Hopton House, Hopton Industrial Estate, Devizes, Wiltshire, SN10 2EU
Tel: [phone] Fax: [phone]
Email: [email protected] www.grantuk.com
This manual is accurate at the date of printing but will be superseded and should be disregarded if specifications and/or appearances are changed in the interests of continued product improvement.
However, no responsibility of any kind for any injury, death, loss, damage or delay however caused resulting from the use of this manual can be accepted by Grant Engineering (UK) Limited, the
author or others involved in its publication.
All good sold are subject to our official Conditions of Sale, a copy of which may be obtained on application.
© Grant Engineering (UK) Limited. No part of this manual may be reproduced by any means without prior written consent.
IMPORTANT NOTE FOR INSTALLERS
These instructions are intended to guide Installers on the
installation, commissioning and servicing of the Grant Vortex oil
boiler. After installing the boiler, leave these instructions with the
user.
A user handbook is available to guide users in the operation of the
oil boiler.
SPECIAL TEXT FORMATS
The following special text formats are used in these instructions
for the purposes listed below:
! WARNING !
Warning of possible human injury as a consequence of not
following the instructions in the warning.
! CAUTION !
Caution concerning likely damage to equipment or tools
as a consequence of not following the instructions in the
caution.
! NOTE !
Used for emphasis or information not directly concerned
with the surrounding text but of importance to the reader.
PRODUCT CODES COVERED
These instructions cover the following product codes:
VTXBH1521, VTXBH2126, VTXBH2635, VTXBH3646,
VTXBH4658 and VTXBH5870.
SERVICING
The boiler should be serviced at least every twelve months and
the details entered in the Service Log in the user handbook.
Page 2
FUEL TYPE
All Grant Vortex boilers are suitable for use with Class C2
Kerosene. To use Bio-Kerosene (B30K), refer to the information
below:
OPERATION ON BIO-FUEL
All Grant Vortex condensing boilers manufactured since May
2011 are suitable for for operation on both standard Kerosene
(Class C2 to BS 2869) and also bio-kerosene - up to a 30% blend
(B30K).
All burner settings and nozzle sizes (as detailed in Section 2.2 of
these instructions) are correct for both standard kerosene and bio-
kerosene (B30K).
In order to operate this boiler on bio-kerosene, it will be necessary
to take the following actions:
• Useabio-kerosene(B30K)compatibleexibleoillinein
place of the oil line supplied with the boiler.
• Have the oil storage tank and oil supply line (including all
pipework,sightgauges,lters,isolatingvalves,revalves,
de-aeration devices, etc.) checked for their compatibility with
bio-kerosene (B30K).
Where necessary, some or all of these items may have to be
replaced with a bio-kerosene compatible alternative.
• CheckthesuitabilityoftheuesystemwithGrantUK.
• Use only bio-kerosne (B30K) that conforms to OPS24.
IMPORTANT:
Under no circumstances, should the boiler be used with
bio-kerosene without the above actions being taken rst.

1 INTRODUCTION 4
1.1 How a condensing boiler operates 4
1.2 Boiler description 4
1.3 Flue options 4
1.4 Boiler components 5
2 TECHNICAL DATA 6
2.1 Boiler technical data 6
2.2 Burner settings 7
2.3 Flue gas analysis 7
2.4 Water connections 7
2.5 Boiler dimensions 8
3 OIL STORAGE AND SUPPLY SYSTEM 10
3.1 Fuel supply 10
3.2 Burner oil connection 12
3.3 Fitting the burner 13
4 BOILER INSTALLATION INFORMATION 14
4.1 Introduction 14
4.2 Boiler location 14
4.3 Regulations compliance 14
4.4 Heating system design 14
considerations
4.5 Pipework materials 15
4.6 Connections 15
4.7 Preparation for installation 15
4.8 Installing the boiler 15
4.9 Before you commission 15
5 PIPE CONNECTIONS 16
5.1 General 16
5.2 15/21, 21/26 and 26/35 models 16
5.3 36/46 model only 16
5.4 46/58 and 58/70 models 17
5.5 Fitting the dual thermostat 17
6 CONDENSATE DISPOSAL 18
6.1 General requirements 18
6.2 Connections 18
6.3 Pipework 18
6.4 External pipework 18
6.5 Condensate soakaway 19
6.6 Condensate trap 19
6.7 Condensate disposal pipework 19
6.8 Inspection and cleaning of trap 19
7 SEALED SYSTEMS 20
7.1 Sealed system requirements 20
7.2 Filling the sealed system 21
7.3 Venting the pump 21
7.3 Pressure relief (safety) valve 21
operation
Contents Page 3
8 ELECTRICAL 22
8.1 General 22
8.2 Connecting the power supply 22
8.3 Frost protection 22
8.4 Wiring diagrams 22
9 FLUE SYSTEM AND AIR SUPPLY 25
9.1 Air supply 25
 9.2 Conventionaluesystems  25
 9.3 Connectingaconventionalue 28
 9.4 Balanceduesystems  28
9.5 Flue clearances 32
9.6 Prepare the wall 33
10 COMMISSIONING 34
10.1 Before switching on 34
10.2 Air adjuster disc - 15/21 only 35
10.3 Combustion head adjustment - 35
58/70 only
10.4 Switching on 35
10.5 Running the boiler 36
10.6 Balancing the system 36
10.7 Completion 36
11 BOILER SERVICING 37
11.1 General 37
11.2 Checks before servicing 37
11.3 Dismantling prior to servicing 37
11.4 Cleaning the boiler 37
11.5 Cleaning the burner 39
12 FAULT FINDING 40
 12.1 Boilerfaultnding   40
 12.2 Burnerfaultnding-RielloRDB 41
13 SPARE PARTS 42
13.1 Riello RDB 2.2 burners 42
(15/21, 21/26, 26/35 and 36/46)
13.2 Riello RDB 3.2 burners 44
(46/58 and 58/70)
13.3 Boiler Parts List 46
14 DECLARATION OF CONFORMITY 47
15 HEALTH AND SAFETY INFORMATION 48
15.1 Insulation materials 48
15.2 Sealant and adhesive 48
15.3 Kerosene and Gas Oil fuels 48
16 END OF LIFE INFORMATION 49
17 PRODUCT FICHE 50
CONTENTS

Section 1: IntroductionPage 4
1.1 HOW A CONDENSING BOILER
OPERATES
During the combustion process, hydrogen and oxygen combine
to produce heat and water vapour. The water vapour produced
is in the form of superheated steam in the heat exchanger. This
superheated steam contains sensible heat (available heat) and
latentheat(heatlockedupintheuegas).Aconventionalboiler
cannot recover any of the latent heat and this energy is lost to the
atmospherethroughtheue.
The Grant Vortex condensing boiler contains an extra heat
exchanger which is designed to recover the latent heat normally
lostbyaconventionalboiler.Itdoesthisbycoolingtheuegases
to below 90°C, thus extracting more sensible heat and some of
thelatentheat.Thisisachievedbycoolingtheuegasestotheir
dew point (approximately 55°C).
Toensuremaximumefciency,theboilerreturntemperature
should be 55°C or less, this will enable the latent heat to be
condensedoutoftheuegases.
• Theboilerwillachievenetthermalefcienciesof100%.
To achieve maximum performance from the Grant Vortex boiler,
it is recommended that the heating system is designed so that a
temperaturedifferentialof20°Cbetweentheowandreturnis
maintained. The use of modulating circulating pumps (now widely
available) and effective control systems should be considered.
The Grant Vortex boiler will however still operate at extremely
highefcienciesevenwhenitisnotincondensingmodeand
thereforeissuitableforttingtoanexistingheatingsystem
without alteration to the radiator sizes. The boiler is capable of a
maximumowtemperatureof75°C.
1.2 BOILER DESCRIPTION
The Grant Vortex Boiler House range of automatic pressure jet oil
boilers have been designed for use with a fully pumped central
heating system with indirect domestic hot water cylinder.
They are not suitable for use with either a direct cylinder or a
‘primatic’ cylinder or gravity hot water.
The boilers are suitable for use on open vented or sealed central
heating systems.
The boilers are supplied with a separate burner and dual
thermostat (15/21, 21/26, 26/35 and 36/46 models only).
Thedualthermostatissuppliedfactoryttedonthe46/58,58/70
models.
1.3 FLUE OPTIONS
Theboilerscanbeconnectedtoeitheraconventionaluesystem
orabalanceduesystem,asrequired.
1.3.1 FOR CONVENTIONAL FLUE APPLICATIONS
Where a chimney is to be lined - Grant recommends the use
oftheGrant‘Orange’uesystem,specicallydesignedforthe
Vortex range of condensing boilers. Refer to Section 9.2 for
further details.
Wherearigidconventionalue-eitherinternalorexternal-is
required, Grant recommends the use of the Grant ‘Green’ and
‘Orange’uesystemcomponents.Asnoueadaptorissupplied
with the boiler it will be necessary to purchase the Grant CF
adaptor kit in order to correctly connect this system to the boiler.
Flue adaptor kit (Grant product code: CFA15/70) is used for all
models as they all use the 100 mm ‘Green’ and ‘Orange’ system
componentstoconstructaueofmaximumverticalheight19
metres.
! NOTE !
The ue system materials and construction MUST be
suitable for use with oil-red condensing boilers. Failure
to t a suitable conventional ue may invalidate the
guarantee on the boiler.
1.3.2 FOR BALANCED FLUE APPLICATIONS
ThefollowinguekitsareavailablefromGrantUK.Referto
Section 9.4.
Yellow system
Standardlowlevelconcentricbalancedue-components
available:
• Lowlevelconcentricbalancedueshort
• Extensions 225 mm, 450 mm and 675 mm
• 90° extension elbow
• 45° extension elbow
• 45° elbow
• Plume diverter kits
Green system
Standardexternalhighlevel/verticaluestarterkit(roomsealed)-
components available:
• Externalhighlevel/verticaluestarterkitshort(roomsealed)
• Extensions 150 mm, 250 mm, 450 mm, 950 mm
• Adjustable extension 195 to 270 mm
• 45° elbow
• High level terminal
• Vertical terminal
White system
Highlevelandverticalconcentricbalanceduekit-components
available:
• Extensions 225 mm, 450 mm, 950 mm
• Adjustable 275 to 450 mm
• Verticalconcentricbalanceduekit
• Extensions 225 mm, 450 mm, 950 mm
• Adjustable extension 275 to 450 mm
• 45° elbow
Red system (15/21 and 21/26 only)
Aexibleverticalbalanceduesystemdesignedtobettedinside
an existing masonry chimney.
Consisting of three sections:
•Concentricwhitepainteduepipeconnectedtotheboiler
•Verticalconcentricexibleue(exiblestainlesssteelueliner
insideaexibleplasticairinletliner)
•Terminalassemblyforchimneytopmounting
Flue extensions and 45° elbows from the White system may be
used.
Fitting instructions for the Low level, High level and Vertical
balanceduesystemsaresuppliedwiththekits.
1 INTRODUCTION

Section 1: Introduction Page 5
1.4 BOILER COMPONENTS
All burners are pre-set for use with kerosene and are supplied
ready to connect to a single pipe fuel supply system with a loose
exiblefuellineand3/8ʺto1/4ʺBSPmaleadaptorsuppliedwith
the boiler.
Ifrequired,anadditionalexiblefuelline(600mm)and3/8”to
1/4”BSPmaleadaptorareavailabletopurchasefromGrantUK,
for two-pipe oil supply systems (Grant product code: RBS104).
The temperature of the water leaving the boiler to heat the
radiators and hot water cylinder is user adjustable.
Theboileristtedwithanoverheatthermostat(whichallows
it to be used on a sealed central heating system) which will
automatically switch off the boiler if the heat exchanger exceeds a
pre-set temperature of 110°C ± 3°C.
TheBoilerHousedualthermostat,ontopoftheboiler,istted
with a boiler thermostat control knob and the manual reset button
for the overheat thermostat.
The controls are shown in Figure 1.2.
Figure 1-1: Boiler components (model shown: 26/35kW)
Figure 1-2: Dual thermostat

2.1 BOILER TECHNICAL DATA
Table 2-1: Boiler technical data
Units 15/21 21/26 26/35 36/46 46/58 58/70
Water content litre 13 13 19 21 50 50
gal 2.9 2.9 4.2 4.7 11 11
Weight (dry)* kg 125 125 143 145 257 301
lb 276 276 315 320 567 664
Maximum heat output (Kerosene) kW 21.5 26.3 35.4 46.0 58.0 70.0
Btu/h 73,400 89,800 120,000 157,000 197,900 238,840
Minimumowrate(∆T=10°C) l/h 1,780 2,200 2,980 4,000 5,200 6,000
Minimumowrate(∆T=20°C) l/h 890 1,100 1,490 2,000 2,600 3,000
Condensate connection 22 mm (only connection plastic pipe)
Flue diameter (conventional) 100 mm 100 mm 100 mm 100 mm 125 mm** 125 mm**
Watersideresistance∆T=10°C mbar 28.5 26.0
Watersideresistance∆T=20°C mbar 10 9.5
Maximum static head m 28
Minimum circulating head m 1
Boiler thermostat range °C 50±5 to 75±4
Limit (safety) thermostat shut off temperature °C 110 ± 3
Maximum hearth temperature °C Less than 50
Electricity supply ~230 1ph 50Hz 5A fused
Burner motor power Watts 90 150
Absorbed motor power kW 0.16
Starting current Amps 4.2 6.4
Running current Amps 0.85 1.2
Oil connection ¼ʺBSPmale(onendofexiblefuelhose)
Conventionaluedraught mbar Minimum: 0.087 - Maximum: 0.37
in wg Minimum: 0.035 - Maximum: 0.15
Maximum operating pressure - sealed/open system bar 2.5
Maximum operating pressure - pressure relief valve bar 2.5
Boiler type ON/OFF
*Weightincludesburnerbutexcludesue
**125mmdiameterrequiredforexibleueliner(orangesystem).Forrigiduesystems,e.g.greensystem,100mmdiameteruerequired.RefertoSection9
for further details.
Section 2: Technical DataPage 6
2 TECHNICAL DATA

2.2 BURNER SETTINGS
Table 2-2: Burner settings
Boiler models
(burner type)
Heat output
Nozzle
Oil
pressure
(bar)
Smoke
No.
Burner
head
type
Burner head/
disc setting
Fuel
ow rate
(kg/h)
Flue gas
temp.
(°C)
CO2
(%)
(kW) (Btu/h)
VTXBH1521
(RDB2.2)
15.5 52,900 0.50/80°EH 7.0 0 - 1 T1 Disc setting B 1.29 55 - 75 11 - 12
18.5* 63,15 0 0.55/80°EH 7. 5 0 - 1 T1 Disc setting C 1.53 55 - 75 11 - 12
21.5 73,400 0.60/80°EH 8.5 0 - 1 T1 Disc setting C 1.78 55 - 75 11 - 12
VTXBH2126
(RDB2.2)
21.5 73,400 0.60/80°EH 8.5 0 - 1 T1 Fixed 1.78 55 - 75 11 - 12
23.5* 80,200 0.65/80°EH 8.5 0 - 1 T2 Fixed 1.95 55 - 75 11 - 12
26.3 89,800 0.75/80°EH 8.0 0 - 1 T2 Fixed 2.19 55 - 75 11 - 12
VTXBH2635
(RDB2.2)
26.3 89,800 0.75/80°EH 8.0 0 - 1 T2 Fixed 2.19 55 - 75 11 - 12
31.9* 108,800 0.85/80°EH 9.1 0 - 1 T3 Fixed 2.65 55 - 75 11 - 12
35.4 120,000 1.00/80°EH 8.0 0 - 1 T3 Fixed 2.93 55 - 75 11 - 12
VTXBH3646
(RDB2.2)
36.0 123,000 1.00/80°EH 9.0 0 - 1 T5 Fixed 3.01 55 - 75 12.0
41.5* 142,000 1.20/80°S 8.0 0 - 1 T5 Fixed 3.56 55 - 75 12.0
46.0 157,000 1.25/80°S 8.0 0 - 1 T5 Fixed 3.90 55 - 75 12.0
VTXBH4658
(RDB3.2)
46.0 157,000 1.25/80°S 8.0 0 - 1 GIB Head setting 0 4.01 55 - 75 12.0
52.0* 177,400 1.35/80°S 9.5 0 - 1 GIB Head setting 0 4.47 55 - 75 12.0
58.0 197,900 1.65/80°S 8.0 0 - 1 GIB Head setting 0 5.05 55 - 75 12.0
VTXBH5870
(RDB3.2)
58.0 198,000 1.65/80°S 8.0 0 - 1 GIB Head setting 0 5.05 55 - 75 12.0
64.0* 218,400 1.65/80°S 9.5 0 - 1 GIB Head setting 0 5.58 55 - 75 12.0
70.0 238,840 1.75/80°S 9.5 0 - 1 GIB Head setting 4 6.01 55 - 75 12.0
Notes:
1. The data given above is approximate only.
2. The above settings may have to be adjusted on site for the correct operation of the burner.
3. Gas Oil is NOT suitable for use with Grant Vortex boiler range
4. Theuegastemperaturesgivenaboveare±10%.
5. When commissioning, the air damper must be adjusted to obtain the correct CO2level.
6. * Factory settings: 15/21 - 18.5kW, 21/26 - 23.5kW, 26/35 - 31.9kW, 36/46 - 41.5kW, 58/70 - 52.0kW, 58/70 - 64.0kW
7. The combustion door test point may be used for CO2andsmokereadingsonly.Donotusethistestpointfortemperatureorefciencyreadings.
8. When setting the 15/21 to 15.5kW and the 58/70 to 70.0kW, the burner air adjuster disc requires repositioning. Refer to Section 6 (Commissioning).
When setting the 58/70 to 70.0kW, the burner air adjuster disc requires repositioning. Refer to Section 6 (Commissioning).
When setting the 21/26 to 21.5kW output, the combustion head must be changed. Refer to Section 11.4 (Cleaning the burner).
When setting the 26/35 to 26.3kW output, the combustion head must be changed. Refer to Section 11.4 (Cleaning the burner).
9. The installer must amend the boiler data label if the output is changed.
2.3 FLUE GAS ANALYSIS
To allow the boiler to be commissioned and serviced, the boiler is supplied with a combustion test point on the front cleaning door.
When this test point is used please note the following:
• The test point is for CO2and smoke readings only.
• Theboilerefciencyandtemperaturemustbetakenfromtheuetestpointonhighlevel,verticalandconventionalueadaptors.
• Concentriclowleveluesdonotcontainatestpoint.Thetemperatureandefciencyreadingsmustbetakenfromtheueterminal.
2.4 WATER CONNECTIONS
Table 2-3: Water connections
Boiler model Flow connection Return connection
Size Fitting Supplied Size Fitting Supplied
15/21 1ʺBSP BSP female Fitted 1ʺBSP BSP female Fitted
21/26 1ʺBSP BSP female Fitted 1ʺBSP BSP female Fitted
26/35 1ʺBSP BSP female Fitted 1ʺBSP BSP female Fitted
36/46 28mm pipe* Compression Inttingskit* 1ʺBSP BSP female Fitted
46/58 1¼ʺBSP BSP female Fitted 1¼ʺBSP BSP female Fitted
58/70 1¼ʺBSP BSP female Fitted 1¼ʺBSP BSP female Fitted
*Thepipeandcompressionttingareplacedundertheblankingplatethatcoverstheowconnection.
Section 2: Technical Data Page 7

2.5 BOILER DIMENSIONS
Section 2: Technical DataPage 8
DWG NO: REV:
BOILERHOUSE 15-35kW 04/07/17 22620
DATE:
JOB TITLE:
BOILERHOUSE SERIES 2
DRAWING TITLE: REV DISCRIPTION: REV DATE:
714
892
431
194
329
215
597
87
32
33
28
467
PLAN VIEW
REAR VIEW LEFT SIDE VIEW RIGHT SIDE VIEW
106
629
591
CONDENSATE
DRAIN
FLOW
RETURN
114
Figure 2-4: 15/21, 21/26 and 26/35 dimensions
Figure 2-5: 36-46 dimensions
DWG NO: REV:
BOILERHOUSE 26-46kW 04/07/17 22621
DATE:
JOB TITLE:
BOILERHO USE SERIES 2
DRAWING TITLE: REV DISCRIPTION: REV DATE:
PLAN VIEW
REAR VIEW LEFT SIDE VIEW RIGHT SIDE VIEW
456
703
880
592
458
27
228
193
28
88
323
108
556
RETURN
FLOW
CONDENSATE
DRAIN
114
* Condensate drain:
Upper opening: 15/21 and 21/26 models
Lower opening: 26/35 model only
*

Section 2: Technical Data Page 9
Figure 2-6: 46/58 and 58/70 dimensions
DWG NO: REV:
BOILERHOUSE 46-70kW 04/07/17 22622
DATE:
JOB TITLE:
BOILERHOUSE SERIES 2
DRAWING TITLE: REV DISCRIPTION: REV DATE:
PLAN VIEW
REAR VIEW
LEFT SIDE VIEW RIGHT SIDE VIEW
271
411
111
443
430
28
1078
1024
586
768542
287
CONDENSATE
DRAIN
836
FLOW
AIR VENT
924
RETURN
114

3.1 FUEL SUPPLY
3.1.1 FUEL STORAGE
The tank should be positioned in accordance with the
recommendations given in BS 5410-1 (Code of Practice for
Oil Firing - Installations up to 45kW output capacity for space
heating and hot water supply purposes). This gives details of the
requirements for suitable oil tank construction, tank installation,
tankbases,reprotectionandsecondarycontainment.
For installations of greater than 45kW output capacity, the tank
should be installed accordance with BS 5410-2.
Oil storage tanks should comply with the following standards:
• Plastic tanks OFT T100
• Steel tanks OFT T200
! CAUTION !
A galvanised tank must not be used.
! NOTE !
Plastic tanks should be stood on a rm non-combustible
base that adequately and uniformly supports the weight of
the tank over its entire base area.
The tank capacity should be selected to suit the appliance rated
output. Refer to BS5410-1 for guidance.
3.1.2 FUEL PIPES
Fuel supply pipes should be either copper or steel. Galvanised
pipesorttingsshouldnotbeused.
Plastic oil supply pipe conforming to BS EN 14125 can be used
for underground pipe runs, but must not be used above ground.
All soft copper pipe connections should preferably be made using
aredttings.Ifcompressionttingsaretobeused,asuitable
pipeinsertmustbettedintothepipeend.
Soft soldered connections must NOT be used on oil supply
pipework.
Fuel supply pipework should be of a suitable diameter, depending
on the type of oil supply system being used. Refer to information
given in sections 3.1.3, 3.1.4 or 3.1.5.
Run pipes as level as possible to prevent air being trapped. Take
the most direct route possible from tank to burner whilst locating
the pipe where it will be protected from damage.
Pipes should be supported to prevent sagging and sleeved where
they pass through a wall.
Ametalbodyfuellterofnobetterthan70μm(micron)mustbe
ttedintheoilsupplypipeclosetothetank.Thisshouldbetted
withsufcientclearancearoundandbelowittoalloweasyaccess
for maintenance.
Anisolatingvalveshouldalsobettedatthetank,beforethelter,
toallowtheoilsupplytobeshutofffortheltertobeserviced.
Asecondlter(15μmforKerosene)mustbelocatedclosertothe
burner to protect the burner pump and nozzle from contamination.
Refer to Figures 3-1 to 3-3.
Aremotesensingrevalvemustbeinstalledinthefuelsupply
line in accordance with BS540-1.
Afusiblewheelheadtypecombinedisolating/revalveMUST
NOTbeusedinplaceofaremotesensingrevalve.
Therevalvemustbelocatedoutside;justbeforetheoilline
entersthebuilding,withtherevalvesensorlocatedabovethe
burner.
A spring clip for mounting the sensor is provided with the boiler.
Thisshouldbexedwiththescrewprovided,usingthesmallhole
in the front panel of the boiler.
Therevalveshouldbelocatedafterthesecond(15micron)lter,
i.e.betweenthelterandthepointatwhichtheoillineentersthe
building. Refer to Figures 3-1 to 3-3.
Therevalvemusthaveanoperatingtemperatureofbetween
65 and 72°C to avoid unnecessary nuisance shut-offs to the oil
supply.
Aexiblefuelhoseand¼ʺisolatingvalvearesuppliedlosewith
the boiler, to make the final connection to the burner.
If a two-pipe system or deaerator is to be used, the following
additional items will be required:
• Flexiblefuelhose⅜ʺmalex¼ʺfemale,900mmlong
(product code: RBS36)
• ⅜ʺx¼ʺBSPadaptor(productcode:RBS35)
• ¼ʺisolatingvalve(productcode:ISOLATION1/4)
These are available to purchase from Grant UK.
Metal braided flexible fuel hoses should be replaced ANNUALLY
when the boiler is serviced.
Long life flexible fuel hoses should be inspected annually and
replaced, if necessary, or after a maximum five years service life.
3.1.3 SINGLE PIPE (GRAVITY) SYSTEM -
(REFER TO FIGURE 3-1)
Head A (m) Maximum pipe run (m)
10 mm OD pipe 12 mm OD pipe
0.5 10 20
1.0 20 40
1.5 40 80
2.0 60 100
If the storage tank outlet is at least 300 mm above the level of the
level of the burner oil pump, a single pipe (gravity) system should
be used.
The maximum height of the oil level above the burner oil pump
when the tank is full, must not exceed four metres. If this height
isexceeded,apressurereducingvalvemustbettedintheoil
supply pipe between the tank and the burner oil pump.
The maximum length of pipe run from the tank to the burner is
limited by the minimum head of oil (the height of the tank tank
outlet above the burner oil pump).
3.1.4 TWO PIPE SYSTEM -
(REFER TO FIGURE 3-2)
Head A (m) Maximum pipe run (m)
10 mm OD pipe 12 mm OD pipe
0 35 100
0.5 30 100
1.0 25 100
1.5 20 90
2.0 15 70
3.0 8 30
3.5 6 20
If the storage tank outlet is below the level of the burner oil pump,
a two pipe (sub gravity) system can be used.
The return pipe should be at the same level as the tank outlet,
between 75 to 100 mm above the base of the tank. The return
pipeshouldbeasufcientdistancefromthetankoutletsoasto
prevent any sediment disturbed by the return entering the supply
pipe from the tank.
Anon-returnvalveshouldbettedinthesupplypipe,alongwith
arevalveandlters(refertosection3.1.2-fuelpipes).Anon-
returnvalveshouldalsobettedinthereturnpipeifthetopofthe
tank is above the burner oil pump.
The maximum suction height (from the tank outlet to the level of
the burner oil pump), must not exceed 3.5 metres.
The pump vacuum should not exceed 0.4 bar. Beyond this limit,
gas is released from the oil.
Section 3: Oil Storage and Supply SystemPage 10
3 OIL STORAGE AND SUPPLY SYSTEM