Grant Vortex Eco Series User guide

UK | DOC 0127 | Rev 2.1 | January 2020
Grant Vortex Eco
Wall Hung External
and Wall Hung External System
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This manual is accurate at the date of printing but will be superseded and should be disregarded if specications and/or appearances are changed in the interests of continued product improve-
ment. 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 o󰀩cial 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 AND SERIAL NUMBERS
COVERED
The serial numbers used on Grant oil boilers consist of a fteen
digit numerical code with the nal three digits being the product
identier.
For example:
100000200218763
These instructions cover the following product codes and serial
numbers:
Product code Serial number identier
VTXOMWH12/16 763
VTXOMWH16/21 764
VTXSOMWH12/16 765
VTXSOMWH16/21 776
Page 2
SERVICING
The boiler should be serviced at least every twelve months and
the details entered in the Service Log in the user handbook.
FUEL TYPE
All Grant Vortex boilers are suitable for use with Class C2
Kerosene.
The use of Class D Gas Oil on all Grant Vortex Low NOx and Blue
Flame boilers DOES NOT comply with ErP requirements or EU
regulations, and as a result Grant UK does not condone its use.
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 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-kerosene (B30K) that conforms to OPS24.
IMPORTANT:
Under no circumstances, should the boiler be used with
bio-kerosene without the above actions being taken rst.
! NOTE !
This appliance can be used by children
aged from 8 years and above and persons
with reduced physical, sensory or mental
capabilities or lack of experience and
knowledge if they have been given
supervision or instruction concerning
use of the appliance in a safe way and
understand the hazards involved.
Children shall not play with the appliance.
Cleaning and user maintenance shall not
be made by children without supervision.

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 Sealed system data 6
2.3 Burner settings 7
2.4 Flue gas analysis 7
2.5 Water connections 7
2.6 Boiler dimensions 8
3 OIL STORAGE AND SUPPLY SYSTEM 9
3.1 Fuel supply 9
3.2 Burner oil connection 11
4 INSTALLATION 12
4.1 Introduction 12
4.2 Boiler location 12
4.3 Regulations compliance 12
4.4 Heating system design
considerations 12
4.5 Pipework materials 13
4.6 Connections 13
4.7 Preparation for installation 13
4.8 Dismantling the boiler 13
4.9 Installing the boiler 15
4.10 Filling the heating system 16
4.11 Before you commission 16
4.12 Completion 16
5 PIPE CONNECTIONS 17
5.1 Water connections 17
5.2 Water connections - system models 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 20
6.8 Inspection and cleaning of trap 20
7 SEALED SYSTEMS 21
7.1 Sealed system requirements 21
7.2 Filling the sealed system 22
7.3 Venting the pump 22
7.4 Pressure relief (safety) valve
operation 22
7.5 System models 23
8 ELECTRICAL 24
8.1 General 24
8.2 Connecting the power supply 24
8.3 Frost protection 25
8.4 Control system wiring diagrams 26
8.5 Boiler control panel wiring diagrams 28
Contents Page 3
9 FLUE SYSTEM AND AIR SUPPLY 29
9.1 Air supply 29
9.2 Conventional ue systems 29
9.3 External conventional ue
(green system) 29
9.4 Flue clearances 31
10 COMMISSIONING 33
10.1 Before switching on 34
10.2 Burner settings 34
10.3 Switching on 35
10.4 Running the boiler 36
10.5 Balancing the system 36
10.6 Completion 36
10.7 Information for the user 36
11 SERVICING 37
11.1 Checks before servicing 37
11.2 Dismantling prior to servicing 37
11.3 Cleaning the boiler 38
11.4 Cleaning the burner 38
11.5 Cleaning the burner:
Other components 39
11.6 Recommissioning 39
11.7 Burner components 40
12 FAULT FINDING 41
12.1 Boiler fault nding 41
12.2 Burner fault nding charts 42
13 SPARE PARTS 45
13.1 Boiler parts list 45
13.2 Sealed system parts list 45
13.3 Ecoam Max 1 LN Burner 46
14 DECLARATION OF CONFORMITY 48
15 HEALTH AND SAFETY INFORMATION 49
15.1 Insulation materials 49
15.2 Sealant and adhesive 49
15.3 Kerosene and Gas Oil fuels 49
16 END OF LIFE INFORMATION 50
17 PRODUCT FICHE 51
18 GUARANTEE 52
A1 WILO YONOS PARA RS RKC
CIRCULATING PUMP 54
A2 WILO-PARA 25-130/7-50/SC-6#GRA
CIRCULATING PUMP 56
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 e󰀩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 e󰀩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 di󰀨erential of 20°C between the ow and return is
maintained.
The Grant Vortex boiler will however still operate at extremely
high e󰀩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 Eco external modules have an insulated
waterproof enclosure made of galvanised steel with a powder
coated nish and are designed for external installation, mounted
on a suitable external wall.
The Grant Vortex Eco Wall Hung 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. System models are supplied with the necessary
components factory tted. Refer to Section 7.
All boilers are supplied with the control panel and burner factory
tted.
The boilers are supplied with a ue terminal but can be connected
to a conventional ue system.
All the models in the current Grant Vortex Eco range of boilers are
designed to comply with the maximum NOx emissions* under the
Energy-related Products Directive (ErP).
* From the 26th September 2018, the maximum NOx emissions
for all new oil red boilers (up to and including 400kW for both
new build and replacement boiler installations) is 120mg/kWh.
1.3 FLUE OPTIONS
Grant Vortex Eco External Wall Hung boilers are supplied with a
45° conventional ue terminal (see Figure 1-1). There is one ue
outlet position on these boilers, directly on top of the module (see
Figure 2-1). The terminal can be rotated to direct the plume in the
desired direction.
It is possible to discharge the products of combustion at a higher
level by using the following components from the Grant ‘Green’
ue system:
• External module starter (available as a straight section only
on the External Wall Hung boilers)
• Fixed extensions 150mm, 250mm, 450mm and 950mm
• Adjustable extension 195 to 270mm
• 45° elbow
• High level 90° or vertical terminal
It is possible to extend the ue system by 19m vertically (from the
boiler outlet) using this system.
Please note, the ue may only be brought up vertically from Grant
Vortex Eco External Wall Hung boilers.
Please refer to Sections 4.9 and 9 for more detailed instructions
on how to install the ue system.
Conventional ues only may be tted to Grant Vortex Eco External
boilers.
! 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 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 two pipe fuel supply system with a two
exible fuel lines and 3/8ʺ to 1/4ʺ BSP male adaptor supplied with
the boiler. Please refer to Section 3 for further details.
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 o󰀨 the boiler if the heat exchanger exceeds a
pre-set temperature of 110°C ± 3°C.
The control panel is tted with an ON/OFF switch, boiler
thermostat control knob and the manual reset button for the
overheat thermostat.
To access the controls, remove the front door from the boiler.
Turn the knob at the bottom of the front door anticlockwise and
pull the door outwards at the bottom. Carefully release the top of
the front door panel from under the top casing panel ange and
remove it from the boiler to reveal the boiler as shown in Figure
1-1.
Figure 1-2 shows the details of the control panel.
1.4.1 BOILER CONTROLS
To access the control panel, remove the front door panel from the
boiler. The controls on the panel are as follows:
Boiler On/O󰀨 switch
This switches the boiler on and o󰀨. The boiler ON/OFF switch
incorporates a ‘mains on’ neon which lights when the boiler is
switched on. Please note that the ‘mains on’ neon does not
necessarily indicate that the burner is ring.
Figure 1-1: Boiler with front panel removed Figure 1-2: Boiler controls
! NOTE !
If the ON/OFF switch is set to o󰀨 the boiler will NOT supply
central heating or heat domestic hot water (if a hot water
cylinder is connected to the boiler). The built-in frost
thermostat will also not operate.
Service/Test Switch (External Modules only)
A Service switch is tted to the control panel to allow the Service
Engineer to test-re the boiler.
Heating Thermostat
This control allows the temperature of the water leaving the boiler
to heat the radiators (and domestic hot water) to be adjusted. This
will be set by the installer to the optimum temperature for e󰀩cient
operation of the boiler. It should be left set in this position.
Overheat Thermostat (Overheat Reset)
The boiler is tted with a safety overheat thermostat which
will automatically switch o󰀨 the boiler in the case of a control
malfunction causing overheating.
System Pressure Gauge (System models only)
This is to indicate the water pressure in the sealed heating
system.

2.1 BOILER TECHNICAL DATA
Table 2-1: Boiler technical data
Units Wall Hung External Wall Hung External System
12/16 16/21 12/16 16/21
Water content litre 13.4 13.4 13.4 13.4
gal 3.5 3.5 3.5 3.5
Weight - complete boiler (dry) kg 92.4 92.4 99.3 99.3
lb 203.7 203.7 218.9 218.9
Weight - boiler shell only (dry)* kg 56.5 56.5 56.5 56.5
lb 124.6 124.6 124.6 124.6
Maximum heat output (Kerosene) kW 16.5 21.0 16.5 21.0
Btu/h 56,300 71,700 56,300 71,700
Minimum ow rate (∆T=10°C) l/h 1,410 1,800 1,410 1,800
Minimum ow rate (∆T=20°C) l/h 730 900 730 900
Condensate connection Accepts 21.5 mm Ø polypropylene overow pipe
Flue diameter (conventional) mm 100
Waterside resistance ∆T=10°C mbar 28.5
Waterside resistance ∆T=20°C mbar 10.0
Maximum static head m 28
Minimum circulating head m 1
Boiler thermostat range °C 50 to 75
Limit (safety) thermostat shut o󰀨
temperature °C 110 ± 3
Maximum casing temperature °C Less than 50
Electricity supply ~230 1ph 50Hz 5A fused
Burner motor power Watts 75
Absorbed motor power kW 0.155 0.143
Starting current Amps 2.7
Running current Amps 0.67
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 2.0
Maximum operating pressure -
pressure relief valve bar 2.5
Boiler type ON/OFF
* Weight of shell - without ba󰀪es and clean out door: 45.5kg
2.2 SEALED SYSTEM DATA
Table 2-2: Sealed System Data
External System 12/16 and 16/21
Heating system pressure (cold) Minimum 0.5 bar | Maximum 1.0 bar
Operating pressure of pressure relief valve 2.5 bar
Expansion vessel size (pre-charged at 1 bar) 8 litres
Maximum heating system volume (including boiler)* 85 litres
Cold water mains connection 15 mm compression (supplied)
Pressure relief valve discharge connection 15 mm compression (supplied)
* Based on vessel charge and system cold ll pressure of 0.5 bar
Section 2: Technical DataPage 6
2 TECHNICAL DATA

2.3 BURNER SETTINGS
Table 2-3: Burner settings
Boiler
models
(burner
type)
Heat output
Nozzle
Oil
pressure
(bar)
Smoke
No.
Burner
head type
Distance
between
nozzle and
burner head
Fuel
ow rate
(kg/h)
Flue gas
temp.
(°C)
CO2
(%)
Flue gas
VFR ‡
(m³/hr)
(kW) (Btu/h)
External and
External
System 12/16
(Ecoam
Max 1 LN
Vortex WM
12-16 ERP)
12.7 40,900 0.40/80°S 7 0 - 1 EK 12-16 30.5 1.06 60 - 65 12.5 13.0
14.0 * 47, 8 0 0 0.40/80°EH 9 0 - 1 EK 12-16 31.5 1.17 65 - 69 12.5 15.0
16.5 56,300 0.50/80°EH 8 0 - 1 EK 12-16 32.5 1.38 65 - 69 12.5 17.0
External and
External
System 16/21
(Ecoam
Max 1 LN
Vortex WM
16-21 ERP)
16.5 56,300 0.50/80°EH 7 0 - 1 EK 16-21 29.5 1.38 65 - 69 12.5 17.0
18.7 * 63,800 0.50/80°EH 10 0 - 1 EK 16-21 31.0 1.56 70 - 75 12.5 20.0
21.0 71,700 0.60/80°EH 8 0 - 1 EK 16 - 21 31.0 1.76 75 - 79 12.5 23.0
Notes:
‡ Flue gas VFR: Flue gas volumetric ow rate
1. The data given above is approximate only and is based on the boiler being used with a low level balanced ue.
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: 12/16 - 14kW, 16/21 - 18.7kW.
7. The combustion door test point may be used for CO2 and smoke readings only. Do not use this test point for temperature or e󰀩ciency readings.
8. The installer must amend the boiler data label if the output is changed.
2.4 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 e󰀩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 e󰀩ciency readings must be taken from the ue terminal.
2.5 WATER CONNECTIONS
Table 2-4: Water connections
Boiler model Flow connection Return connection
Size Fitting Supplied Size Fitting Supplied
All models 22 mm Push-t Tectite Fitted 22 mm Push-t Tectite Fitted
Section 2: Technical Data Page 7

2.6 BOILER DIMENSIONS
Section 2: Technical DataPage 8
Figure 2-1: Vortex Eco Wall Hung External and External System 12/16 and 16/21
FRONT VIEW
TOP VIEW
BOTTOM VIEW
RIGHT SIDE VIEW
LEFT SIDE VIEW
351
832
684
214
246
674
23
185
245
98
351
Flow
Return
Cold Mains
Condensate
Electricity
Flow
Return
Cold Mains
Electricity
BACK PANEL*
89 102
133
168
202
237
272
308
670
73 120 120 270
394
684
123 425
122
832
*Back panel viewed from front.

Section 3: Oil Storage and Supply System Page 9
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
liquid fuel ring. Installations for space heating and hot water
supply purposes for domestic buildings). 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 70kW 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 with a ltration size of no more than 50 μm
(micron) must be tted in the oil supply pipe close to the tank. This
should be tted with su󰀩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 o󰀨 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 BS5410-1.
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 externally to the appliance casing,
with the re valve sensor located above the burner.
A spring clip for mounting the sensor is supplied tted to the
boiler, on the rear of the control panel.
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
appliance casing. Refer to Figures 3-1 to 3-3.
The re valve must have an operating temperature of between
90 and 95°C to avoid unnecessary nuisance shut-o󰀨s to the oil
supply.
Two exible fuel hoses, adaptors and ¼ʺ isolating valves are
supplied loose with the boiler, to make the final connection to the
burner with a two pipe or ‘Tiger Loop’ type de-aerator.
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
(metres)
Maximum pipe run (m)
Ø 6 mm Ø 8 mm Ø 10 mm
0.5 19 60 100
1 21 66 100
1.5 23 72 100
2 25 79 100
2.5 27 85 100
3 29 91 100
3.5 31 98 100
If the storage tank outlet is at least 300 mm above 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 outlet
above the burner oil pump).
3.1.4 TWO PIPE SYSTEM -
(REFER TO FIGURE 3-2)
Head
(metres)
Maximum pipe run (m)
Ø 6 mm Ø 8 mm Ø 10 mm
0.5 15 47 100
1 13 41 99
1.5 11 34 84
2 9 28 68
2.5 7 22 53
3 5 15 37
3.5 - 9 22
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 su󰀩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.
For guidance on the installation of top outlet fuel tanks and suction
oil supply pipe sizing, refer to OFTEC Technical Book 3: Storage
and Supply, available for purchase from OFTEC.
3 OIL STORAGE AND SUPPLY SYSTEM

Section 3: Oil Storage and Supply SystemPage 10
Figure 3-1: Single pipe (gravity) system
123
2
6
12
9
7
4
8 5
4m Max
300mm
Min
123
2
6
12
9
7
4
11
3.5m Max
10
8 5
123
2
6
12
9
7
4
10
3.5m Max
150mm
10
5
8 5
DATE: 23rd November 2017
SCALE: A4: 1:40
DRAWN BY: T. K. Lavery
CHECKED BY: P. Stanley □
DRAWING NAME:
Oil Tank Installation for Oil Boiler Manuals - External Wall
DRAWING NUMBER: 00
REVISION: 00
GRANT ENGINEERING UK LTD
Hopton Industrial Estate Devizes SN10 2EU
123
2
6
12
9
7
4
8 5
4m Max
300mm
Min
123
2
6
12
9
7
4
11
3.5m Max
10
8 5
123
2
6
12
9
7
4
10
3.5m Max
150mm
10
5
8 5
DATE: 23rd November 2017
SCALE: A4: 1:40
DRAWN BY: T. K. Lavery
CHECKED BY: P. Stanley □
DRAWING NAME:
Oil Tank Installation for Oil Boiler Manuals - External Wall
DRAWING NUMBER: 00
REVISION: 00
GRANT ENGINEERING UK LTD
Hopton Industrial Estate Devizes SN10 2EU
Key to oil supply diagrams
1 Oil tank 5 Heating ow and return 9Burner
2 Isolating valve 6 Oil lter (15μm max. ltration size) 10 Non-return valve
3 Oil strainer 7 Fire valve sensor 11 De-aerator*
4Fire valve to BS 5410-1 8 Oil pump 12 Appliance isolation valves
* Position of de-aeration device must be level with or above the oil pump
123
2
6
12
9
7
4
8 5
4m Max
300mm
Min
123
2
6
12
9
7
4
11
3.5m Max
10
8 5
123
2
6
12
9
7
4
10
3.5m Max
150mm
10
5
8 5
DATE: 23rd November 2017
SCALE: A4: 1:40
DRAWN BY: T. K. Lavery
CHECKED BY: P. Stanley □
DRAWING NAME:
Oil Tank Installation for Oil Boiler Manuals - External Wall
DRAWING NUMBER: 00
REVISION: 00
GRANT ENGINEERING UK LTD
Hopton Industrial Estate Devizes SN10 2EU
Figure 3-3: De-aeration device system
Figure 3-2: Two pipe system

Section 3: Oil Storage and Supply System Page 11
3.1.5 SINGLE PIPE (SUCTION) SYSTEM WITH
DEAERATOR - (REFER TO FIGURE 3-3)
If the storage tank outlet is below the level of the burner oil pump,
an alternative to the two pipe (sub gravity) system is the single
pipe (suction) system using a deaerator, e.g. a ‘Tiger Loop’
device.
The deaerator creates a loop with the burner oil pump, with the oil
being circulated through the pump out to the deaerator and back
to the pump. Any air in the single pipe lift from the tank is removed
from the oil, collected in the deaerator and then discharged to
outside.
! WARNING !
To prevent any fuel vapour being discharged within
the building, the deaerator must be tted outside, in
accordance with BS 5410-1, unless it is specically
designed to be installed inside.
The de-aerator must be mounted vertically at the same level as
(or above) the burner oil pump. Refer to Figure 3-3.
1/4" BSP female
connections
Tiger Loop
SUPPLY
TO PUMP
RETURN
FROM PUMP
SUPPLY
FROM TANK
Figure 3-4: Tiger loop de-aeration device
An external deaerator must not be tted within 500 mm of a ue
terminal.
Always follow the manufacturers installation instructions supplied
with the deaerator.
3.2 BURNER OIL CONNECTION
The burner fuel pump is supplied factory set for use with a two
pipe oil supply system.
For ease of access to the burner oil pump connections, the burner
should be removed from the boiler as follows:
1. Unscrew and remove the single burner fixing nut from the
stud on the burner flange (at the top of the burner) using a 13
mm spanner. Retain the fixing nut for re-fitting the burner.
2. Rotate the burner clockwise and carefully withdraw the
burner from the boiler. Refer to Figure 3-5.
Figure 3-5: Burner removal
SINGLE PIPE (GRAVITY) SYSTEM
For use on a single pipe system, it is necessary to t the
‘horseshoe’ washer into the tapping in the pump. Refer to Figure
3-6.
Figure 3-6: Fitting/location of ‘hoseshoe’ washer

Section 4: InstallationPage 12
4.1 INTRODUCTION
The boiler is supplied already fully assembled in a carton which
is carefully packed with packing materials. As the boiler is wall
mounted all of the content of the boiler casing must be removed
with the packaging before installation can begin, to give access to
the rear xing panel.
The installation procedure therefore begins with unpacking and
dismantling of the packed boiler.
4.2 BOILER LOCATION
The module should installed externally, xed to a wall that is rm,
at, vertical and capable of supporting the boiler when full of
water. Refer to Section 2.1 for weights.
It does not require any special mounting provisions as the
temperature of the boiler casing is less than 50°C.
The module must be positioned such that the required clearances
from the low level ue outlet as shown in Figure 9-2 are achieved.
The module must be installed with the ue terminal terminating
at least two metres above ground level (refer to BS 5410-1). No
terminal guard can be tted if termination is less than two metres
above ground level. In this situation, use the Green ue system to
achieve the minimum height. Refer to Section 9.
The ue terminal must be a minimum distance of 1.8 metres from
an oil storage tank.
The ue terminal should be positioned so as to avoid products of
combustion accumulating in stagnant pockets around the building
or entering into buildings.
Su󰀩cient clearance must be allowed at the front of and below the
boiler to remove the burner and ba󰀪es for servicing.
4.3 REGULATIONS COMPLIANCE
! NOTE !
Failure to install and commission appliances correctly may
invalidate the boiler guarantee.
Installation of a Grant Vortex boiler must be in accordance with
the following recommendations:
• Building Regulations for England and Wales, or the Building
Standards for Scotland, as appropriate.
• Any relevant local Byelaws which you must check with the
local authority for the area concerned.
• The Water Supply (Water Fittings) Regulations 1999 or
the Water Supply (Fittings) (Scotland) Byelaws 2014, as
appropriate.
• Applicable Control of Pollution Regulations.
• The following OFTEC requirements:
• OFS T100 Polythene oil storage tanks for distillate fuels.
• OFS T200 Fuel oil storage tanks and tank bunds for use
with distillate fuels, lubrication oils and waste oils.
Further information may be obtained from the OFTEC Technical
Book 3 (Installation requirements for oil storage tanks) and
OFTEC Technical Book 4 (Installation requirements for oil red
boilers).
The installation should also be in accordance with the latest
edition of the following British Standard Codes of Practice (and
any relevant amendments):
• BS 5410-1: 2019 (Code of practice for liquid fuel ring.
Installations for space heating and hot water supply purposes
for domestic buildings)
• This standard covers domestic installations up to 70kW.
• BS 5410-2: 2018 (Code of practice for liquid fuel ring. Non-
domestic installations)
• This standard should be followed with regard to
installations with an output capacity in excess of 70kW.
• Where the combined outputs of multiple appliances
located together at a domestic dwelling exceed 70kW
then then a dedicated plant room as specied in BS
5410-2 is recommended.
• BS EN 12828 (Heating systems in buildings. Design for
water-based heating systems)
• BS EN 12831-1 (Energy performance of buildings. Method
for calculation of the design heat load)
• BS EN 14336 (Heating systems in buildings. Installation and
commissioning of water-based heating systems)
• BS 7593 (Code of Practice for treatment of water in domestic
hot water central heating systems)
• BS 7671 (Requirements for Electrical installations, IET Wiring
Regulations)
• BS 7291 (Thermoplastics pipe and tting systems for hot and
cold water for domestic purposes and heating installations in
buildings. General requirements)
• BS 7074-1 (Application, selection and installation of
expansion vessels and ancillary equipment for sealed water
systems. Code of practice for domestic heating and hot water
supply)
• BS 2869 (Fuel oils for agricultural, domestic and industrial
engines and boilers. Specication)
! WARNING !
BS5410-1: 2019 requires that appliances located in a
building or structure or within a restricted area externally
should have a CO detector conforming to BS EN 50291-1
installed in the same room/space.
4.4 HEATING SYSTEM DESIGN
CONSIDERATIONS
! WARNING !
Before starting any work on the boiler or fuel supply,
please read the Health and Safety information given in
Section 15.
To achieve the maximum e󰀩ciency possible from the Grant Vortex
boiler, the heating system should be designed to the following
parameters:
RADIATORS:
• Flow temperature 70°C
• Return temperature 50°C
• Di󰀨erential 20°C
Size radiators with a mean water temperature of 60°C.
Design system controls with programmable room thermostats
or use weather compensating controls to maintain return
temperatures below 55°C.
! NOTE !
The boiler should not be allowed to operate with return
temperatures of less than 40°C when the system is up to
temperature.
The use of a pipe thermostat is recommended to control the return
temperature when using weather compensating controls.
UNDERFLOOR:
• Flow temperature 50°C
• Return temperature 40°C
• Di󰀨erential 10°C
In underoor systems, it is essential that the return temperature
must be maintained at or above 40°C to prevent internal corrosion
of the boiler water jacket.
Refer to Section 2.5 for the size and type of the connections and
Section 5 for the position of the connections.
4 INSTALLATION

Section 4: Installation Page 13
OPEN VENTED SYSTEMS:
! NOTE !
The presence of ‘pumping over’ in an open vented heating
system connected to the Grant Vortex boiler will invalidate
the product guarantee.
Open vented systems must be correctly designed and installed.
The open safety vent pipe must be positioned to prevent ‘pumping
over’ (i.e. the discharge of water from the open safety vent pipe
into the feed and expansion cistern under the pressure created by
the circulator). For detailed information on the correct design of
open vented heating systems, and the correct location of the open
safety vent pipe, refer to the CIBSE Domestic Heating Design
Guide and OFTEC Technical Book 4 (Installation).
4.5 PIPEWORK MATERIALS
Grant Vortex boilers are compatible with both copper and plastic
pipe. Where plastic pipe is used it must be of the oxygen barrier
type and be the correct class (to BS 7291-1) for the application
concerned.
On either sealed or open-vented systems; where plastic pipe is
used a minimum of ONE metre of copper pipe (or as per pipe
manufacturers instructions) MUST be connected between both
the boiler ow and return connections and the plastic pipe.
! NOTE !
Do not connect plastic pipe directly to the boiler.
Grant UK does not accept any responsibility for any damage,
however caused, to plastic piping or ttings.
SEALED SYSTEMS
If plastic pipe is to be used, the installer must check with the
plastic pipe manufacturer that the pipe to be used is suitable for
the temperature and pressures concerned.
Plastic pipe must be Class S to BS 7291-1.
! WARNING !
When plastic pipe is used, the system MUST incorporate
a low pressure switch to shut o󰀨 power to the boiler if
the system pressure drops below 0.2 bar. A suitable low
pressure switch kit is available to purchase from Grant UK
(product code: MPCBS62).
UNDERFLOOR PIPEWORK
Plastic pipe may be used on underoor oor systems where the
plastic pipe is tted after the thermostatic mixing valve. Copper
tube must be used for at least the rst metre of ow and return
primary pipework between the boiler and the underoor mixing/
blending valves.
4.6 CONNECTIONS
4.6.1 FLOW AND RETURN CONNECTIONS
Refer to Sections 4.9 & 5.
4.6.2 CONDENSATE CONNECTION
Grant Vortex Eco boilers are supplied with a factory-tted
condensate trap to provide the required 75 mm water seal in the
condensate discharge pipe from the boiler.
Refer to Section 6 for details of the condensate disposal pipework.
4.6.3 DRAIN COCK
A drain cock is tted at the bottom on the front of the boiler to
allow the heating system to be drained.
4.7 PREPARATION FOR INSTALLATION
The following procedure must be performed before you can begin
dismantling the boiler for installation:
1. With the boiler on the pallet, open the carton and remove all
packing materials and the carton from the boiler.
2. To access the controls, remove the front door from the boiler.
Turn the knob at the bottom of the front door anticlockwise
and pull the door outwards at the bottom. Carefully release
the top of the front door panel from under the top casing
panel ange and remove it from the boiler to reveal the boiler
as shown in Figure 1-1.
3. Remove internal packaging from within boiler casing.
4. Remove ue terminal, lling loop and exible oil hose packs
from within boiler.
4.8 DISMANTLING THE BOILER
Dismantle the boiler as follows, keeping all components, screws
and washers for re-assembly:
1. Slacken o󰀨 hose clip on burner air inlet and remove snorkel
tube from boiler.
2. Unscrew earth wire from underside of top casing panel.
3. Remove screws securing top casing panel and remove
casing panel from boiler.
4. Remove silver cover from burner control box and disconnect
plug from burner control box.
5. System model only – Disconnect plug from pump.
6. Unscrew inlet connection to condensate trap and remove
trap from boiler.
7. Remove retaining clip and thermostat phials from their
pocket in the right side of heat exchanger – below the return
connection. (See Figure 4-1)
Pocket for Thermostat
Phials
Figure 4-1: Removing thermostat phials
8. System model only - Unscrew and disconnect pressure
gauge pipe from PRV body.
9. System model only - unscrew expansion vessel hose from
connection on boiler shell and remove expansion vessel from
boiler. (See Figure 4-2)
10. Remove screws securing right hand side panel and remove
side panel, complete with control panel, pulling it forward and
away from boiler.
11. Repeat procedure to remove left hand side panel from boiler.
12. Remove screws securing bottom casing panel and remove
bottom panel from boiler.
13. System model only - Unscrew upper pump union and remove
pump, complete with ow pipe, from boiler. (See Figure 4-3)

Section 4: InstallationPage 14
14. Non-system model – Unscrew compression connection on
boiler shell and remove ow pipe from boiler.
15. Unscrew top right compression connection and remove
return pipe from boiler.
16. Using a 13mm socket, slacken burner retaining nut (on top
of burner). Rotate burner clockwise (towards rear of boiler),
pull burner to the right until burner head is clear of mounting
ange and remove burner from boiler.
17. Using 13mm spanner, unscrew the two clean-out door
retaining nuts and remove door from front of boiler shell.
(See Figure 4-4).
Figure 4-4: Removing clean-out door
18. Remove ba󰀪es from boiler shell. (See Figure 4-5).
Figure 4-5: Removing ba󰀪es from boiler shell
19. Undo retaining screw and nut and remove transit bracket
from top of boiler shell.
20. Push boiler shell upwards to disengage it from mounting
bracket on back panel of boiler taking care not to damage the
insulation on the side of shell.
21. Lift boiler shell away from back panel and stand it upright on
the four feet.
! WARNING !
The boiler shell is HEAVY and requires more than one
person to lift. Refer to Section 2.1 for boiler weights.
22. Carefully remove the foil-faced insulation from the back
panel.
23. Unscrew and remove the two transit screws securing
mounting bracket and back panel to pallet.
Return
Pipe
Flow
Pipe
Upper pump
union (slightly
obscured by
pump cover)
Figure 4-3: Removing ow and return pipe - System model only
Figure 4-2: Expansion vessel, Expansion vessel bracket and
hose connection - System model only

4.9 INSTALLING THE BOILER
You are now ready to install the boiler.
! NOTE !
The boiler must be mounted such that the boiler ue
terminal (supplied with the boiler) terminates at or above 2
metres above ground level.
If the distance is to be less than this, Grant UK suggest
using the Green system to achieve a termination point of at
least 2 metres above ground level.
The procedure is as follows:
Figure 4-6 shows the mounting bracket in position on the back
casing panel, with the holes in the bracket in-line with the
corresponding holes in the back casing panel.
Mounting bracket
fixing holes
Keyhole slots
Figure 4-6: Mounting bracket and xing holes in position on back
panel
1. Remove any required knockouts from the back and bottom
panels of the boiler casing for the heating system pipework,
cold mains supply, oil supply, condensate discharge,
electricity supply and PRV discharge (it is recommended that
one of the knockouts in the bottom panel is used for the PRV
discharge).
2. Locate and hold the back panel in the required position on
the wall. Check it is level using a spirit level on the top ange.
Mark position of the holes for the two keyhole slots (See
Figure 4-6). Remove the back panel from the wall.
3. Drill and t wall xing plugs (not supplied) in the two holes.
Fit the two screws (supplied) and mount the back panel on
the wall using the two keyhole slots.
Check again that the back panel is level before proceeding.
4. Mark the position of the four mounting bracket xings on to
the wall from the back panel. Also mark the positions of the
ow and return pipes, the cold mains (for lling loop), the
electrical power supply, and the condensate discharge pipe.
5. Remove the back panel from the wall. Drill the holes for the
mounting bracket xing holes. Drill all other necessary holes.
Re-mount the back panel on the two keyholes slots.
6. Locate the mounting bracket on to the back panel, aligning
the four holes in the bracket with those in the back panel.
Ensure that the mounting ‘hooks’ are pointing upwards and
secure using the xings supplied with the boiler.
7. Check the mounting bracket is level.
8. Carefully ret insulation into back panel, passing mounting
'hooks' through the two slits in the insulation.
9. Lift the boiler shell and hang it on the mounting bracket –
ensuring that the mounting plates on either side of the shell
are fully located in the vertical slot of both mounting hooks.
! WARNING !
The boiler shell is HEAVY and requires more than one
person to lift. Refer to Section 2.1 for boiler weights.
10. Re-t the return pipe to top right hand connection on boiler
shell. Pass return pipe from system through hole in wall and
connect to boiler return pipe.
11. System model only - Re-t pump complete with ow pipe to
upper pump union on boiler shell. Ensure that rubber pump
union washer is tted. Pass ow pipe from system through
hole in wall and connect to boiler ow pipe.
12. Non-system model – Re-t ow pipe to compression
connection on boiler shell. Pass ow pipe from system
through hole in wall and connect to boiler ow pipe.
! NOTE !
It is recommended that the system ow and return pipes
are connected to the boiler at this point in the installation.
Two 22mm isolating valves are supplied for use with sealed
system models only. These must not be used on an open
vented system. These boiler isolating valves should be
located adjacent to the boiler in a convenient position.
13. System model only - connect a 15 mm discharge pipe, of
metal construction, to the outlet of the PRV and run vertically
down through the relevant knockout in the bottom panel
of the boiler casing. Refer to Sections 5.2 and 7 for further
guidance
14. Re-t burner. First remove burner securing nut, locate
burner head into hole in burner ange/boiler shell and locate
mounting screw through hole on top of burner. Re-t nut and
tighten to secure burner in place. Connect exible oil lines
from oil supply pipework to burner. It is recommended that
the copper oil lines are installed at this stage while the side
panels are not in place.
15. Ret ba󰀪es into boiler shell – ensuring they are in the correct
order (check marking on each ba󰀪e) as shown in Figure 4-7.
Section 4: Installation Page 15

16. Locate clean-out door onto the two studs, re-t nuts and
tighten to secure door in place.
17. Ret left hand casing panel and secure in place with screws
(with washers).
18. Ret bottom casing panel and secure in place with screws
(with washers).
19. Ret right hand casing panel complete with control panel
tted.
20. Relocate thermostat bulbs in pocket at rear right hand side of
boiler shell.
21. System model only - Reconnect pressure gauge to PRV and
tighten.
22. Re-connect burner plug to burner control box and ret the
silver cover onto the control box.
23. System model only - Reconnect pump plug.
24. Ret condensate trap. Connect condensate discharge pipe to
outlet of trap. Refer to Section 6 for further details.
25. System model only - Ret expansion vessel onto bracket
inside right hand side panel and reconnect expansion vessel
hose to connection on front right hand side of boiler shell.
Ensure rubber sealing washer is tted.
26. Ret top casing panel and secure in place with screws (with
washers).
27. If the ue terminal supplied is to be tted, carefully push it
through the seal in the hole in top casing panel.
Ensure that the seal is tted to the terminal and that it is
pushed fully home into the ue connector on the boiler shell.
Position the outlet to point to the left and at an angle of 45°
away from the wall.
28. Re-t casing front door - locate top edge up under front
ange of top panel. Push bottom of front panel into opening
until ush with edge of side panels before rotating handle
clockwise to secure.
29. Fit the wall ashing strip. Position the strip with the bottom
edge of the wider ange 20 mm above the enclosure top
panel, with the narrow ange (with the three xing holes) at
against the wall. The strip should overhang the top panel by
an equal amount at each end.
4.10 FILLING THE HEATING SYSTEM
Refer to Section 7.2 (Filling the Sealed System)
4.11 BEFORE YOU COMMISSION
To avoid the danger of dirt and foreign matter entering the boiler
the complete heating system should be thoroughly ushed
out – both before the boiler is connected and then again after
the system has been heated and is still hot. This is especially
important where the boiler is to be installed on an older system.
For optimum performance after installation, the boiler and the
associated heating system must be ushed in accordance with
the guidelines given in BS 7593 (Treatment of water in domestic
hot water central heating systems). This must involve the use
of a proprietary cleaner, such as Sentinel X300 (new systems),
Sentinel X400 (existing systems), or Fernox Restorer.
After cleaning, it is vitally important that all traces of the cleaner
are thoroughly ushed from the system.
For long term protection against corrosion and scale, after
cleaning/ushing a suitable inhibitor should be added to the
system water, such as Sentinel X100 or Fernox MB-1, in
accordance with the manufacturers’ instructions.
Failure to follow the above will invalidate the guarantee.
If the boiler is installed in a garage, out house or outside, in order
to provide further protection should there be a power failure in
cold weather, a combined anti-freeze and corrosion inhibitor can
be used such as Sentinel X500 or Fernox Alphi-11. Follow the
manufacturers’ instructions supplied to achieve the level of anti-
freeze protection required.
For details of the Sentinel Products visit www.sentinel-solutions.
net and for Fernox products visit www.fernox.com.
Grant UK strongly recommends that a Grant Mag One in-line
magnetic lter/s (or equivalent*) is tted in the heating system
pipework. This should be installed and regularly serviced in
accordance with the lter manufacturer’s instructions.
* As measured by gauss. The MagOne magnetic lter has a gauss
value of 12000.
4.12 COMPLETION
Following installation of the boiler, instruct the user in the
operation of the boiler, the boiler controls, the heating controls and
the safety devices.
Please ensure that the OFTEC CD/10 installation completion
report (provided with the boiler) is completed in full, leaving the
top copy with the user and retain the carbon copy for your own
records.
Ensure that the User Handbook (supplied with the boiler) is
handed over to the user.
Section 4: InstallationPage 16
Figure 4-7: Re-tting ba󰀪es into boiler shell

5.1 WATER CONNECTIONS
FLOW AND RETURN CONNECTIONS -
ALL MODELS
On all models a 22mm push-t connection is provided for both the
heating ow and return connections.
Holes are provided in the back plate at high and low levels
to route the pipework back into the property as required. See
Section 2.6.
! CAUTION !
All pipes to be tted into the push-t connectors provided
should be cut using a pipe slicer or pipe cutter - to leave
the pipe ends with a slight radius and free from any burrs
or sharp edges. Pipes to be used with these ttings should
not be cut square using a hacksaw.
PIPE ENTRY/EXIT HOLES IN CASE
All models have holes to enable the pipework to exit the boiler
casing.
On all models these holes are pre-cut knock-outs located in both
the back and bottom panels.
Push out the ‘knock-out’ from the required holes, taking care not
to distort the panel.
5.2 WATER CONNECTIONS -
SYSTEM MODELS
A 15 mm discharge pipe must be connected to the safety valve
outlet connection. The pipework between the safety valve and the
boiler must be unrestricted, that is, no valves. The discharge pipe
should be run to the outside of the building and terminate so that it
cannot cause injury to persons or property.
A 15 mm double check valve ballox type valve is provided on the
exible lling loop hose for connection of the cold mains supply to
the heating system.
The cold mains supply should terminate inside the boiler casing.
A drain cock is tted at the bottom on the front of the boiler to
allow the heating system to be drained.
The expansion vessel is connected via a exible hose to allow it
to be moved to gain access to the burner and condensate trap for
servicing.
When replacing the vessel, care should be taken to ensure that
the exible connecting hose is not twisted.
! NOTE !
For guidance on the connection of the heating system
pipework, please refer to Section 4.9.
Figure 5-1: Non system boiler ow and return connections
Return
Flow
Section 5: Pipe Connections Page 17
5 PIPE CONNECTIONS
Figure 5-2: System boiler ow and return connections

Section 6: Condensate DisposalPage 18
6.1 GENERAL REQUIREMENTS
When in condensing mode the Grant Vortex boilers produce
condensate from the water vapour in the ue gases.
This condensate is moderately acidic with a pH value of around
3.27 (similar to orange juice).
Provision must be made for the safe and e󰀨ective disposal of this
condensate.
Condensate can be disposed of using one of the following
methods of connection:
Internal connection (preferred option)
• into an internal domestic waste system (from kitchen sink,
washing machine, etc.)
• directly into the soil stack
External connection
• into an external soil stack
• into an external drain or gulley
• into a rainwater hopper (that is part of a combined system
where sewer carries both rainwater and foul water)
• purpose made soakaway
All condensate disposal pipes must be tted with a trap - whether
they are connected internally or externally to a domestic waste
system/soil stack or run externally to a gully, hopper or soakaway.
6.2 CONNECTIONS
Connections into a rainwater hopper, external drain or gulley
should be terminated inside the hopper/drain/gulley below the grid
level but above the water level.
! CAUTION !
Condensate disposal pipes must not be connected
directly into rainwater downpipes or to waste/soil systems
connected to septic tanks.
Condensate should not be discharged into ‘grey water’ systems
that re-use water used in the home (not including water from
toilets).
It should be noted that connection of a condensate pipe to the
drain may be subject to local Building Control requirements.
6.3 PIPEWORK
Condensate disposal pipework must be plastic (plastic waste or
overow pipe is suitable).
! NOTE !
Copper or steel pipe is NOT suitable and MUST NOT be
used.
Condensate disposal pipes should have a minimum ‘nominal’
diameter of 22 mm (¾ʺ) - e.g. use 21.5 mm OD polypropylene
overow pipe.
Condensate disposal pipes must be tted with a fall (away from
the boiler) of at least 2.5° (~45 mm fall per metre run).
! NOTE !
Where it is not possible for the pipe to fall towards the
point of discharge - either internally into a waste system
or externally to a gulley (e.g. for boilers installed in a
basement), it will be necessary to use a condensate pump.
Condensate disposal pipes should be kept as short as possible
and the number of bends kept to a minimum.
Pipes should be adequately xed to prevent sagging, i.e. at no
more than 0.5 metre intervals.
6.4 EXTERNAL PIPEWORK
Ideally, external pipework, or pipework in unheated areas, should
be avoided. If unavoidable, external pipework should be kept as
short as possible (less than 3 metres) and 32 mm waste pipe
used to minimise the risk of ice blocking the pipe in freezing
conditions.
The number of bends, ttings and joints on external pipes should
be kept to a minimum to reduce the risk of trapping condensate.
! NOTE !
For boilers installed in an unheated area such as a loft,
basement, outhouse or garage, all condensate pipework
should be as ‘external’.
The pipework should be insulated using suitable
waterproof and weather resistant insulation.
Ground level
32 mm waste pipe external to the building
Minimum 2.5 fall
O
25 mm
300 mm
400 mm
min.
Two rows of 3 x 12 mm
holes at 25 mm centres
and 50 mm from the bottom
of the tube. Holes facing
away from the property.
Cement seal
100 mm plastic tube Sealed end Backfill with 10 mm
limestone chippings
Figure 6-1: Purpose made condensate soakaway
6 CONDENSATE DISPOSAL

6.5 CONDENSATE SOAKAWAY
To keep external pipework to a minimum, locate the soakaway
as close as possible to the boiler but ensure it is at least 500 mm
from building foundations and away from other services, e.g. gas,
electricity, etc.
The condensate pipe may be run above or below ground level
and can enter either the top or side of the soakaway tube. Refer
to Figure 6-1.
Ensure that the drainage holes in the soakaway tube face away
from the building.
Backll both the soakaway tube, and the hole around it, with 10
mm limestone chippings.
Only use a soakaway where the soil is porous and drains easily.
Do not use in clay soils or where the soil is poorly drained.
! CAUTION !
Any damage due to condensate backing up into the boiler
due to a high water table, in the case of a soakaway, or
ooded drains when the condensate disposal is via a
gulley or soil stack, is not covered by the Grant product
guarantee.
6.6 CONDENSATE TRAP
Grant Vortex boilers are supplied with a condensate trap to
provide the required 75 mm water seal in the condensate
discharge pipe from the boiler.
The condensate trap is factory tted inside the boiler casing -
mounted on the outlet of the condensing heat exchanger - in an
accessible position to allow for routine maintenance.
This trap incorporates a oat (which will create a seal when the
trap is empty) and an overow warning outlet (tted with a plastic
sealing cap), see Figures 6-2 and 6-3.
Figure 6-2: Condensate trap
A ‘push-t’ elbow connects the outlet of the condensing heat
exchanger to the trap inlet. Ensure the elbow connector is fully
pushed onto the ‘top hat’ inlet connector of the trap.
With the trap tted inside the boiler casing, the sealing cap must
be tted. If the trap is re-located outside the boiler then the
following applies:
• If connecting the condensate discharge - either internally or
externally - into a waste system or soil stack - the sealing cap
must be tted in the trap outlet.
• On external discharge systems to a hopper, gully or
soakaway, the sealing cap should be removed from the trap
outlet.
• If there is any discharge of condensate from the overow
outlet, this could indicate a blockage (possibly due to
freezing). Turn o󰀨 the boiler and investigate the cause. If
necessary, contact your service engineer for assistance.
! WARNING !
Care should be taken when siting the trap such that the
overow outlet is readily visible and that any condensate
overowing from the outlet cannot cause either a hazard to
persons or damage to surrounding property or equipment.
Section 6: Condensate Disposal Page 19
Unscrew
this cap for
maintenance
access
Overflow
warning
outlet
(with cap)
Condensate
trap
Condensate
outlet to
drain
End cap
Condensate
inlet from
boiler
Figure 6-3: Condensate trap

Section 6: Condensate DisposalPage 20
6.7 CONDENSATE DISPOSAL PIPEWORK
The condense trap outlet is at an angle of 48° below the
horizontal. This is to automatically gives a 3° fall on any
‘horizontal’ runs of condense disposal pipe. Refer to Figure 6-3
and see trap outlet/pipe.
The outlet of the trap will accept 21.5 mm to 23 mm OD
Polypropylene overow pipe for the condensate discharge pipe.
This discharge pipe can exit through the rear or bottom of the
boiler through one of two pre-cut ‘knock-outs’ in either the back or
bottom casing panels. Push out the ‘knock-out’ from the required
hole taking care not to distort the side panel.
! NOTE !
When connecting plastic discharge pipe, ensure that the
pipe is fully pushed into the outlet end on the exible hose
to prevent the possibility of leakage.
6.8 INSPECTION AND CLEANING OF TRAP
The trap must be checked at regular intervals (e.g. on every
annual service) and cleaned as necessary to ensure that it is clear
and able to operate.
The bottom bowl can be unscrewed from the trap body for
inspection and cleaning.
To inspect and clean the trap:
1. Disconnect elbow from inlet connector.
2. Unscrew the inlet connection nut.
3. Remove the inlet connector and nut from trap.
4. Disconnect the condensate disposal pipe from the trap outlet.
5. Remove trap from bracket.
6. Remove oat from trap – clean if necessary.
7. Inspect inside of trap and clean as necessary.
8. Re-assemble trap, re-t to boiler and re-connect elbow.
Ensure that elbow is fully pushed onto the trap inlet
connector.
! CAUTION !
Failure to regularly check and clean the condensate trap
may result in damage to the boiler and will not be covered
by the product guarantee.