Grant VortexBlue VTXBF21 User guide

UK | DOC 0108 | Rev 2.5 | June 2018
Grant UK VortexBlue
Internal, Internal System, External, Combi and
External Combi Blue Flame Oil Boiler Range
Supplementary User, Installation and Servicing Instr uctions

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This manual is accurate at the date of printing but will be superseded and should be disregarded if specifications and/or appearances are changed in the interests of continued product improvement.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.
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:
VTXBF21, VTXBF26, VTXBF36, VTXSBF21, VTXSBF26,
VTXSBF36, VTXBFCOMBI21, VTXBFCOMBI26,
VTXBFCOMBI36, VTXBFOMCOMB21, VTXBFOMCOMB26 and
VTXBFOMCOMB36
These supplementary Instructions must be read in
conjunction with the Vortex boiler Installation Instructions
supplied with the boiler.
SERVICING
The boiler should be serviced at least every twelve months.
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.

Contents Page 03
Contents
1 User Instructions 4
1.1 VortexBlue Internal, Internal 4
System Boilers and External Modules
1.2 VortexBlue Combi Boilers (Internal and 4
External models)
1.3 Control Panels 5
2 Introduction 6
2.1 Update to Main Installation Instructions 6
2.2 General 6
2.3 Low NOx Technology 6
2.4 Boiler Controls 6
2.5 Fuel Type 6
2.6 Sealed Systems 6
3 Technical Data 7
3.1 Boiler Technical Data 7
3.2 Boiler Clearances 8
3.3 Burner Settings 9
3.4 Boiler Dimensions 10
4 Installation 13
4.1 General 13
5 Electrical 13
5.1 General 13
5.2 Frost Protection 13
5.3 VortexBlue Internal and 13
Internal System models
5.4 VortexBlue External Modules 14
5.5 VortexBlue Combi Boilers and 14
External Combi Boilers
5.6 Wiring Diagrams 15
6 Commissioning 22
6.1 General 22
6.2 Ignition Electrode Setting 22
6.3 Air Damper Adjustment 22
6.4 Air Adjuster Disc - 15-21 model only 22
7 Servicing 23
7.1 General 23
8 Burner 24
8.1 General 24
8.2 Burner Features 24
8.3 Digital Control Box 25
8.4 Burner Operation 26
9 Fault Finding 28
9.1 Burner Fault Indication 28
9.2 Burner Fault Diagnostics 28
9.3 Riello RDB BLU Fault Finding Chart 29
10 Spare Parts 30
10.1 Riello RDB BLU Burner Parts List 30
10.2 Exploded View of Riello RDB BLU Burner 31
Page 03

User InstructionsPage 04
These User Instructions are intended to assist the user in the
operation of the Grant VortexBlue range of high efficiency oil fired
boilers. Please refer to the section that applies to your particular
boiler model.
1.1 VortexBlue Internal, Internal System Boilers and
External Modules
The boiler is fully automatic once switched on, providing central
heating (and also heating your domestic hot water if you have a hot
water cylinder fitted).
For guidance on how to use your Grant VortexBlue Internal boiler (or
Internal System boiler) please refer to the User Instructions for the
Grant Vortex Internal boiler.
These are to be found at the back of the Installation Instructions
supplied with the boiler.
The Grant VortexBlue Internal (and Internal System) boilers
differ from the standard version of the Grant Vortex, as
follows:
a) The use of the Riello RDB BLU blue flame burner – refer
to Section 7 (installer section) of these Supplementary
Instructions for details.
b) A new boiler control system with electronic temperature
control and LED boiler function indication.
NOTE
!
1.1.1 Boiler Controls
Please refer to the following for details of the boiler control panels.
For all other details refer to the User Instructions supplied with the
boiler.
To access the control panel, pull off the front door panel from the
boiler. The controls on the panel are as follows (refer to Figures 1-1
to 1-3 as appropriate).
• Boiler On/Off switch
This switches the boiler on and off. 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 if firing. See Boiler Indicator
Lights information in the next column.
When the ON/OFF switch is set to on, the POWER indicator LED
on the control panel will also light. This also does not necessarily
indicate that the boiler is firing.
If the ON/OFF switch is set to off 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.
NOTE
!
• Service Switch (Ex ternal Modules only)
A Service switch is fitted to the control panel to allow the Service
Engineer to test-fire the boiler.
1 User Instructions
• 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 efficient
operation of the boiler. It should be left set in this position.
• Boiler Indicator Lights
These five red LEDs, located on the boiler control panel, indicate the
operating situation of the boiler as below:
PUMP Power to the system circulating pump
POWER Mains power to the boiler is switched on
DEMAND Demand for heating (and/or hot water) from the
heating system controls.
OVERHEAT Boiler overheat thermostat has operated and
switched the boiler off.
BURNER Power to the burner for it to operate.
• Overheat Thermostat (Overheat Reset)
The boiler is fitted with a safety overheat thermostat which
will automatically switch off the boiler in the case of a control
malfunction causing overheating.
• System Pressure Gauge
(Internal System models only)
This is to indicate the water pressure in the sealed heating system.
1.1.2 Lighting the Boiler
Please follow the guidance for lighting the boiler given in the User
Instructions supplied with the boiler.
If the reset push-button LED on the burner indicates a lockout (refer
to Section 8.3.3), press the reset button to attempt to re-start the
burner. If the burner then operates correctly the lockout may have
been caused by a temporary fault that has now cleared. If the
lockout persists the cause of the fault should be diagnosed and
rectified.
To operate the reset push-button it must be pressed in and
briefly held (for at least one second) before releasing.
NOTE
!
1.2 VortexBlue Combi Boilers (Internal and Ex ternal
models)
For guidance on how to use your Grant VortexBlue Combi boiler,
please refer to the User Instructions for the Grant Vortex Combi
boiler (or External Combi boiler).
These are to be found at the back of the Installation Instructions
supplied with the boiler.

User Instructions Page 05
Figure 1-1: VortexBlue Internal Control Panel
Figure 1-2: VortexBlue Internal System Control Panel
Figure 1-3: VortexBlue External Module Control Panel
1.3 Control Panels

These supplementary Instructions must be read in
conjunction with the Vortex boiler Installation Instructions
supplied with the boiler.
Both the Vortex boiler Installation Instructions and these
Supplementary Instructions must be lef t with the User on
completion of Installation and Commissioning.
NOTE
!
2.1 Update to Main Installation Instructions
These Supplementary Instructions are designed to cover the
differences between the Grant Vortex and the new Grant VortexBlue
low NOx boilers, as much of the installation, commissioning,
servicing and operation is identical to the standard Vortex boilers.
The following sections of the Vortex Installation Instructions
(supplied with the boiler) have not been changed and should be
referred to during the installation and commissioning of this boiler:
• Section 3 Oil Supply and Storage
• Section 5 Pipe Connections
• Section 6 Condensate Disposal
• Section 7 Sealed Systems
Refer to Section 2.6 of these instructions
• Section 9 Flues and Air Supply
• Section 14 Health and Safety Information
• Section 16 Guarantee
2.2 General
The new Grant VortexBlue range of high efficiency low NOx oil fired
boilers consists of 15 models including Internal, Internal System
and External Modules as well as both Internal and External Combi
boilers.
All models are available in three outputs – 21kW, 26kW and 36kW.
The Internal, Internal System and External Modules are supplied
factory set at the ma ximum outputs of 21kW, 26kW and 36kW but
can be de-rated to a lower output on commissioning if required.
Refer to Section 3.3 of these Supplementary Instructions for a full list
of all models and outputs.
2.3 Low NOx Technology
Grant VortexBlue boilers are designed to meet both the forthcoming
European Ecodesign (ErP) emissions limits due to be introduced in
September 2018, and to maintain the high efficiencies expected of
Grant Vortex oil fired boilers.
They combine the proven Grant condensing boiler technology with
the Riello RDB BLU compact low NOx blue flame burners.
Grant VortexBlue boilers can be used with all the Grant flue system
options available for the standard Vortex boilers. Refer to the
Installation Instructions supplied with the boiler for details.
2 Introduction
2.4 Boiler Controls
2.4.1 Combi Boilers
The Grant VortexBlue Combi boilers (internal and external) have
the same electronic control system as fitted to the standard Vortex
Combi models.
All wiring details for external controls (programmers, room
thermostats, etc.) are given in Section 8 of the Vortex Combi
Installation Instructions provided with the boiler.
2.4.2 Internal boilers and External Modules
The Grant VortexBlue Internal boilers and External Modules
incorporate a new electronic control system based on the one used
in the Grant Vortex Pro Combi boilers.
This uses an electronic boiler thermostat and has LED lights to
indicate the operating status of the boiler. For details on how to
operate the boiler please refer to Section 1.
Refer to Section 5 of these Supplementary Instructions for further
details and electrical connection diagrams.
A service switch is fit ted to the control panel of the external
modules to allow the service engineer to test-fire the boiler.
When set to 'ON' the switch temporarily by-passes the
external control system to operate the boiler.
This is a 'momentary' or non-latching switch that cannot be
left set to 'ON'. The boiler will automatically revert to normal
operation when 15 minutes have elapsed since it was last
operated.
If required, this 15 minute override period can be stopped by
switching the boiler ON/OFF switch 'OFF' and then back to
'ON'.
The boiler will then operate as normal under control of the
external heating/hot water controls (timer, room thermostat
or programmer).
NOTE
!
2.5 Fuel Type
All VortexBlue boilers are designed for use with Kerosene (Class C2)
only.
The use of any other fuel, e.g. Gas Oil (Class D), is not permitted
with any of the VortexBlue boilers and may invalidate the product
guarantee.
2.6 Sealed Systems
The following sealed system kits are available for the external
modules:
VortexBlue External Grant UK product code
VTXBFOM21
VTXOMSSKIT26
VTXBFOM26
VTXBFOM36 VTXOMSSKIT46
Section 2: IntroductionPage 06

Section 3: Technical Data Page 7
3.1 Boiler Technical Data
3.1.1 Internal, Internal System and External
Table 3-1: Internal, Internal System and External Technical Data
Units Internal and Internal System External
21 26 36 21 26 36
Output (Kerosene)
kW 15-21 21-26 26-36 15-21 21-26 26-36
Btu/h 51,200 -
71,00
71,700 -
88,700
88,700 -
123,000
51,200 -
71,00
71,700 -
88,700
88,700 -
123,000
Water content
litres 19 19 21 19 19 21
gall 4.2 4.2 4.7 4.2 4.2 4.7
Weight (dry)*
kg 130 130 144 143 143 162
lbs 287 287 318 315 315 357
Heating system flow connection mm 22 22 28 22 22 28
Heating system return connection mm 22 22 28 22 22 28
Minimum flow rate (∆T=10°C) l/h 1,800 2,200 3,000 1,800 2,200 3,000
Minimum flow rate (∆T=20°C) l/h 900 1,100 1,500 900 1,100 1,500
Condensate connection 22 mm (only connect plastic pipe)
Flue diameter (conventional) 100 mm (4 inches)
Waterside resistance (∆T=10°C) mbar 26
Waterside resistance (∆T=20°C) mbar 9.5
Maximum static head m 28
Minimum circulating head m 1
Boiler thermostat range °C 65 to 78
Limit (safety) shut off temperature °C 111±3
Maximum hearth temperature °C Less than 50
Electricity supply ~230V 1ph 50Hz 5A fused
Burner motor power W 90
Absorbed motor power W 0.15
Starting current A 2.0
Running current A 0.85
Oil connection ¼" BSP male (on end of flexible fuel hose)
Conventional flue draught
N/m² Minimum: 8.7 - maximum: 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
* Weight includes burner but excludes flue.
3 Technical Data

Section 3: Technical DataPage 8
3.1.2 Internal Combi and External Combi
Table 3-2: Internal Combi and External Combi Technical Data
Units Internal Combi Ex ternal Combi
21 26 36 21 26 36
Output (Kerosene)
kW 21 26 36 21 26 36
Btu/h 71,700 88,700 123,000 71,700 88,700 123,000
Water content (including 32 litre primary store)
litres 48.5 48.5 53.5 48.5 48.5 53.5
gall 10.7 10.7 11.8 10.7 10.7 11.8
Weight (dry)*
kg 160 177 200 181 206 225
lbs 353 390 441 399 454 496
Maximum heat output (Kerosene)
kW 21 26 36 21 26 36
Btu/h 71,700 88,700 123,000 71,700 88,700 123,000
Heating system flow and return connections mm 22 22 28 22 22 28
Cold water mains inlet mm 15 15 22 15 15 22
Domestic hot water outlet mm 15 15 22 15 15 22
Minimum flow rate ∆T=10°C l/h 1 800 2 200 3 000 1 800 2 200 3 000
Minimum flow rate ∆T=20°C l/h 900 1 100 1 500 900 1 100 1 500
Condensate connection 22 mm plastic pipe
Flue diameter (conventional) 100 mm (4 inches)
Waterside resistance ∆T=10°C mbar 28.5 28.5 26 28.5 28.5 26
Waterside resistance ∆T=20°C mbar 10.0 10.0 9.5 10.0 10.0 9.5
Boiler stat range °C 65 to 78
Limit stat shut off temperature °C 111±3
Maximum hearth temperature °C Less than 50
Electricity supply 230/240V 1ph 50Hz fused at 5A
Burner motor power W 90
Absorbed motor power W 0.15
Starting current A 2.0
Running current A 0.85
Oil connection ¼" BSP male (on end of flexible fuel hose)
Conventional flue draught
N/m² Minimum: 8.7 - maximum: 37
in wg Minimum: 0.035 - maximum: 0.15
Maximum operating pressure - pressure relief valve bar 2.5
* Weight includes burner but excludes flue
3.2 Boiler Clearances
Adequate clearance must be left for servicing the boiler.
For guidance on the clearances required, please refer to the 'Boiler Location' information given in the 'Installation Information' section of the
Installation Instructions supplied with the boiler.

Section 3: Technical Data Page 9
3.3 Burner Settings
Table 3-3: Burner settings
Boiler models
(burner type)
Heat output
Nozzle
Oil
pressure
(bar)
Smoke
No.
Burner
head
type
Burner
head/
air disc
setting
Fuel
ow rate
(kg/h)
Flue gas
temp.
(°C)
CO2
(%)
Flue
gas
VFR ‡
(m³/hr)
(kW) (Btu/h)
Internal 21
Internal System 21
External 21
(RDB2.2 BG1 BLU 21)
15.0 51,200 0.40/80°ES 9.0 0 - 1 BG1 B 1.25 65 - 75 12.0 16.0
18.0 61,400 0.55/80°ES 8.0 0 - 1 BG1 N/A 1.50 65 - 75 12.0 20.0
21.0 * 71,700 0.60/80°ES 8.5 0 - 1 BG1 N/A 1.75 70 - 80 12.0 23.0
Internal 26
Internal System 26
External 26
(RDB2.2 BG2 BLU 26)
21.0 71,700 0.60/80°ES 8.5 0 - 1 BG2 N/A 1.75 60 - 65 12.0 23.0
23.0 78,500 0.65/80°ES 8.5 0 - 1 BG2 N/A 1.91 65 - 70 12.0 25.5
26.0 * 88,700 0.65/80°ES 10.0 0 - 1 BG2 N/A 2.16 75 - 80 12.0 28.5
Internal 36
Internal System 36
External 36
(RDB2.2 BG3 BLU 36)
26.0 88,700 0.65/80°ES 10.0 0 - 1 BG3+ N/A 2.16 67 - 70 12.0 28.5
31.5 * 107,5 0 0 0.85/80°ES 9.0 0 - 1 BG3+ N/A 2.62 70 - 75 12.0 34.5
36.0 123,000 0.85/80°ES 11.0 0 - 1 BG3+ N/A 2.99 75 - 80 12.0 39.5
Internal Combi 21
External Combi 21
(RDB2.2 BG1 BLU 21)
21.0 71,700 0.60/80°ES 8.5 0 - 1 BG1 N/A 1.75 70 - 80 12.0 23.0
Internal Combi 26
External Combi 26
(RDB2.2 BG2 BLU 26)
26.0 88,700 0.65/80°ES 10.0 0 - 1 BG2 N/A 2.16 75 - 80 12.0 28.5
Internal Combi 36
External Combi 36
(RDB2.2 BG3 BLU 36)
31.5* 107,5 0 0 0.85/80°ES 9.0 0 - 1 BG3+ N/A 2.62 70 - 75 12.0 34.5
36.0 123,000 0.85/80°ES 11.0 0 - 1 BG3+ N/A 2.99 75 - 80 12.0 39.5
Notes:
† Refer to Section 10.2 (Burner Settings: RDB2.2 BX burners)
‡ FluegasVFR:Fluegasvolumetricowrate
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 and Bio Kerosene are NOT suitable for use with Grant VortexBlue boiler range
4. The flue 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 - 21kW, 21-26 - 26kW, 26-36 - 31.5kW, Combi 36 - 31.5kW
7. When setting the 15-21 to 15kW, the burner air adjuster disc (Grant UK product code: RBS215) must be fitted and positioned to disc setting B. Refer to
Section 6.4. This disc is NOT supplied with the boiler but can be obtained free-of-charge by contacting Grant UK.
8. The installer must amend the boiler data label if the output is changed.

Section 3: Technical DataPage 10
3.4 Boiler Dimensions
All dimensions in the following diagrams are in millimetres.
Alternative
condensate
drain outlets
FRONT VIEW
470
860
LEFT SIDE
VIEW
813
759
709
587
352
18
17
110
30 Flue centre line
RIGHT SIDE VIEW
PLAN VIEW
470
603 11 0
Safety valve
Cold fill
Flow - 22mm push-fit
170
Flue
spigot
Figure 3-4: VortexBlue Internal 21, Internal 26, Internal System 21 and Internal System 26 dimensions
Safety valve
Flow - 28mm push-fit
Cold fill
61
170 61
LEFT SIDE VIEW
455
555
311
24
115
63 63
Flue centre line
RIGHT SIDE VIEW
PLAN VIEW
470
603 150
FRONT VIEW
470
900
205
Flue
spigot
Alternative
condensate
drain outlets
Figure 3-5: VortexBlue Internal 36 and Internal System 36 dimensions

Section 3: Technical Data Page 11
Pre-cut hole
for side flue exit
if required
4 pre-cut
holes 50 mm dia.
in sidesboth
1005
509
797
269
908
117
50
757
A
660
418
179
21 and 26kW: A = 804
36kW: A = 824
Plan View
132
180
180
=
=
3 pre-cut holes
76 mm dia. in base
of boiler enclosure
Figure 3-6: VortexBlue External 21, External 26 and External 36 dimensions
RIGHT SIDE VIEW
LEFT SIDE VIEW
PLAN VIEW
REAR VIEW
90
75
75
90
202210
760
690 140
614
307
105
ø
110
ø
155
17
35
227
588
100
699125
444
99
609
ø
31
ø
31
ø
31
INTERNAL DRAIN
TRAP EXIT
(LEFTSIDE
PANEL ONLY)
ø
25
858
Figure 3-7: VortexBlue Internal Combi 21 and 26 dimensions

Section 3: Technical DataPage 12
RIGHT SIDE VIEW
LEFT SIDE VIEW
PLAN VIEW
REAR VIEW
90
62
62
90
182250
779
694 170
614
307
106
ø
110
ø
185
18
60
190
556
100
695170
445
106
609
ø
31
ø
31
ø
31
INTERNAL DRAIN
TRAP EXIT
(LEFTSIDE
PANEL ONLY)
ø
25
900
Figure 3-8: VortexBlue Internal Combi 36 dimensions
966
239
Combi 21e, 26e
Combi 36e
Side flue exit
if required
Pre-cut hole 75 x 150mm in
each side of boiler enclosure
2 pre-cut holes in base
of boiler enclosure
115mm dia.
754
836
150
73
7533
945
33
75
150
49
49
150
658
Plan View
Figure 3-9: VortexBlue External Combi 21, 26 and 36 dimensions

Section 4: Installation and Section 5: Electrical Page 13
4.1 General
For full details on the installation of this boiler, please refer to the
following sections of the Installation Instructions supplied with the
boiler:
• Installation Information
• Pipe Connections
• Condensate Disposal
• Sealed Systems
• Flue System & Air Supply
4 Installation
5.1 General
For details on the electrical installation requirements for this boiler
please refer to the Installation Instructions supplied with this boiler in
conjunction with the information given below.
5.2 Frost Protection
The Internal, Internal System and External Modules are all fitted with
pre-set internal frost protection.
This will automatically start the circulating pump if either:
a) The air temperature (sensed on the boiler control PCB) falls
below 5°C, or
b) The water temperature (sensed by the boiler control thermistor)
falls below 8°C
If after fifteen minutes the air temperature exceeds 10°C or the water
temperature exceeds 15°C the circulating pump will stop.
However, if after fifteen minutes either the air or water temperature
is less than 10°C, the burner is automatically fired until the water
temperature reaches 30°C, when the burner stops and there is a
pump overrun of two minutes.
Also, to protect any exposed heating system pipework, it is
recommended that an 'external' frost thermostat is also installed.
This frost thermostat will operate in parallel with the internal frost
protection of the boiler.
It should be sited within the house in such a place that it can detect
any rise and fall in the ambient air temperature, i.e. in a room with a
radiator.
Where the frost thermostat is installed outside the house (to protect
a boiler installed in an external boiler room or garage) or in an
attic, it is recommended that it be used in conjunction with a pipe
thermostat to avoid unnecessary and wasteful overheating of the
property. The pipe thermostat should be located on the boiler return
pipe, and set to operate at 30°C.
For connection details please refer to Figures 5-4 and 5-5
For total system protection against freezing, particularly
during extended periods without electrical power, Grant
recommend the use of a combined heating system antifreeze
and corrosion inhibitor, used in accordance with the
manufacturer's instructions.
NOTE
!
5 Electrical
5.3 VortexBlue Internal and Internal System models
5.3.1 Connecting Power Supply, Pump and Control System
The boiler requires both a switched live, from an external
programmer or control system AND a permanent live power supply.
This permanent live supply is essential for the fan post purge
operation.
Failure to fit BOTH a switched live and permanent live may cause
damage to the burner.
Do not interrupt the permanent mains supply to the boiler
with any external control, e.g. a timer, programmer, or room
thermostat.
NOTE
!
The boiler must be wired as shown in Figures 5-4 and 5-5, i.e.
with both a permanent live supply AND a separate switched
live (from the heating system controls).
No permanent live supply to the boiler can result in damage
to the burner.
This will not be covered by the boiler product guarantee.
!WARNING
There is no facility in the Grant VortexBlue Internal and Internal
System boilers for the fitting of a plug-in timer or programmer.
A 4-core cable (3-core and earth) is required to connect the power
supply and heating controls to the boiler.
On Internal models a 3-core cable (2-core and earth) is required to
connect the circulating pump to the boiler.
For control system wiring please refer to Figures 5-4 and 5-5
Ensure that the route and length of the supply and pump
cables are such that the boiler control panel can be fully
hinged down without needing to disconnect them from the
terminal block.
NOTE
!
The procedure is as follows:
1. Lift off the boiler top front casing panel, if it has not already
been removed.
2. Loosen (do not remove) the four screws securing the control

Section 5: ElectricalPage 14
panel to the side panels, hinge the panel forward and allow it to
drop down to gain access to the top of the panel.
3. Remove the two screws securing the terminal block cover and
lift off the cover.
4. Remove the screws securing the cable clamp and open clamp.
5. Route the supply cable through the hole in the rear panel (using
the grommet supplied) and up to the control panel
6. Pass the 4-core cable through the cable clamp and connect to
the boiler control panel terminals as follows:
• Green/Yellow to mains earth (terminal 1)
• Blue to mains neutral (terminal 2)
• Brown to mains live (terminal 3)
• Black to switched live (terminal 19)
On Internal models - pass the 3-core cable from the pump
through the cable clamp and connect to the boiler control
panel terminals as follows:
• Green/Yellow to pump earth (terminal 4)
• Blue to pump neutral (terminal 5)
• Brown to pump live (terminal 6)
7. Tighten the cable clamp and refit the terminal block cover
8. Re-connect the electrical supply and check operation of
heating system controls (programmer, room thermostats, etc.).
9. Refer to Instructions provided with the programmer for
operation and setting.
10. Leave the Programmer and Thermostat Instructions with the
user after installation for their future reference.
5.3.2 Circulating Pump
On the Internal System models, the circulating pump is factory
fitted within the boiler enclosure and the pump is wired to the pump
terminals on the control panel terminal block.
On Internal models the pump should also be connected directly to
the control panel terminal block. Refer to Section 5.3.1.
Connected this way allows the pump to be isolated using the
Boiler ON/OFF switch, on the boiler control panel, for servicing or
maintenance work.
Also, the boiler control automatically provides a short pump 'overrun'
(two minutes) after the burner is shut down (when the heat demand
is interrupted), e.g. when the room thermostat is satisfied. This
pump overrun will not occur if the boiler power supply is interrupted,
e.g. if the boiler ON/OFF switch is set to off.
5.4 VortexBlue Ex ternal Modules
5.4.1 Connecting Power Supply, Pump and Control System
The boiler requires both a switched live, from an external
programmer or control system, in addition to a permanent live
power supply.
Do not interrupt the permanent mains supply to the boiler
with any external control, e.g. a timer, programmer, or room
thermostat.
NOTE
!
The boiler must be wired as shown in Figures 5-4 and 5-5, i.e.
with both a permanent live supply AND a separate switched
live (from the heating system controls).
No permanent live supply to the boiler can result in damage
to the burner. This will not be covered by the boiler product
guarantee.
!WARNING
There is no facility in the Grant VortexBlue External Module for the
fitting of a plug-in timer or programmer.
A 4-core cable (3-core and earth) is required to connect the power
supply and heating controls to the boiler.
A 3-core cable (2-core and earth) is required to connect the
circulating pump to the boiler.
For control system wiring, refer to Figures 5-4 and 5-5.
Ensure that the route and length of the supply cable is such
that the boiler control panel can be fully hinged down without
disconnecting the supply cable from the terminal block.
NOTE
!
The procedure is as follows:
1. Remove the module front door panel, if it has not already been
removed.
2. Remove the four screws securing the front of the control panel
and allow it to drop down to gain access to the top of the
panel.
3. Remove the screws securing the cable clamp and open clamp.
4. Route the supply and pump cables up to the control panel.
5. Pass the 4-core cable through the cable clamp and connect to
the boiler control panel terminals as follows:
• Green/Yellow to mains earth (terminal 1)
• Blue to mains neutral (terminal 2)
• Brown to mains live (terminal 3)
• Black to switched live (terminal 19)
6. Pass the 3-core cable from the pump through the cable clamp
and connect to the boiler control panel terminals as follows:
• Green/Yellow to pump earth (terminal 4)
• Blue to pump neutral (terminal 5)
• Brown to pump live (terminal 6)
7. Tighten the cable clamp and refit the front of the control panel.
8. Re-connect the electrical supply and check operation of
heating system controls (programmer, room thermostats, etc.).
9. Refer to Instructions provided with the programmer for
operation and setting.
10. Leave the Programmer and Thermostat Instructions with the
user after installation for their future reference.
5.4.2 Connection of the Circulating Pump
The circulating pump should be connected directly to the control
panel terminal block. Refer to Section 4.4.1.
Connecting the pump in this way allows it to be isolated using the
Boiler On/Off switch, on the boiler control panel, for servicing or
maintenance work.
Also, when the pump is connected this way, the boiler control
automatically provides a short pump 'overrun' (2 minutes) after the
burner has shut down (when the heat demand is interrupted), e.g.
when the room thermostat is satisfied. This pump overrun will not
occur if the boiler power supply is interrupted, e.g. if the boiler ON/
OFF switch is set to off.
5.5 VortexBlue Internal Combi and Ex ternal Combi
Boilers
5.5.1 Connecting the Power Supply and Control System
For details on the electrical installation requirements for the Combi
or External Combi, please refer to Section 8 of the Installation
Instructions supplied with this boiler.

Section 5: Electrical Page 15
1 2 3
E N L
4 5 6
E N L
7 8 9
E N L
10 11 12
E N L
18 20 21 22
15 1613 14 25 26
23 24
17 19 27 28
PUMP EARTH
PUMP NEUTRAL
PUMP LIVE
DO NOT CONNECT
DO NOT CONNECT
DO NOT CONNECT
BURNER EARTH
BURNER NEUTRAL
BURNER LIVE
DO NOT CONNECT
DO NOT CONNECT
DO NOT REMOVE LINK
DO NOT
REMOVE
LINK
DO NOT CONNECT
SWITCHED LIVE
TIMER NEUTRAL
TIMER LIVE
STORE
THERMISTOR
(TO FRONT POCKET)
FLOW
THERMISTOR
(TO TOP POCKET)
MAINS
1A 2A
4B 5B
Boiler
On/Off
Off Off
Constant Timed Timed
Constant
Central
Heating
Switch
Domestic Hot Water
Switch
2 C
Limit
Thermostat
Earth connection boiler top bracket
Printed Circuit Board
FUSE 5 X 20
N L
230V 5A Fused
Supply
N
E
Flow
Thermistor
Black shroud indicates Flow
Thermistor
Link Link
Burner
Resistor
DO NOT CONNECT
DO NOT CONNECT
DO NOT CONNECT
DO NOT REMOVE LINK
DO NOT REMOVE LINK
SL
L
Link
BURNER
PERMANENT LIVE
PERMANENT LIVE
Figure 5-1: VortexBlue Internal control panel wiring diagram
5.6 Wiring Diagrams

Section 5: ElectricalPage 16
1 2 3
E N L
4 5 6
E N L
7 8 9
E N L
10 11 12
E N L
18 20 21 22
15 1613 14 25 26
23 24
17 19 27 28
PUMP EARTH
PUMP NEUTRAL
PUMP LIVE
DO NOT CONNECT
DO NOT CONNECT
DO NOT CONNECT
BURNER EARTH
BURNER NEUTRAL
BURNER LIVE
DO NOT CONNECT
DO NOT CONNECT
DO NOT REMOVE LINK
DO NOT
REMOVE
LINK
DO NOT CONNECT
SWITCHED LIVE
TIMER NEUTRAL
TIMER LIVE
STORE
THERMISTOR
(TO FRONT POCKET)
FLOW
THERMISTOR
(TO TOP POCKET)
MAINS
1A 2A
4B 5B
Boiler
On/Off
Off Off
Constant Timed Timed
Constant
Central
Heating
Switch
Domestic Hot Water
Switch
2 C
Limit
Thermostat
Earth connection boiler top bracket
Printed Circuit Board
FUSE 5 X 20
E N L
N L
Black
Cable
230V 5A Fused
Supply
N
E
Flow
Thermistor
Black shroud indicates Flow
Thermistor
Link Link
Pump Burner
Resistor
BURNER
PERMANENT LIVE
DO NOT CONNECT
DO NOT CONNECT
DO NOT CONNECT
DO NOT REMOVE LINK
DO NOT REMOVE LINK
SL
L
Link
PERMANENT LIVE
Figure 5-2: VortexBlue Internal System control panel wiring diagram

Section 5: Electrical Page 17
1 2 3
E N L
4 5 6
E N L
7 8 9
E N L
10 11 12
E N L
18 20 21 22
15 1613 14 25 26
23 24
17 19 27 28
PUMP EARTH
PUMP NEUTRAL
PUMP LIVE
DO NOT CONNECT
DO NOT CONNECT
DO NOT CONNECT
BURNER EARTH
BURNER NEUTRAL
BURNER LIVE
DO NOT CONNECT
DO NOT CONNECT
DO NOT REMOVE LINK
DO NOT
REMOVE
LINK
DO NOT CONNECT
SWITCHED LIVE
TIMER NEUTRAL
TIMER LIVE
STORE
THERMISTOR
(TO FRONT POCKET)
FLOW
THERMISTOR
(TO TOP POCKET)
MAINS
1A 2A
4B 5B
Boiler
On/Off
2 C
Limit
Thermostat
Earth connection boiler top bracket
Service Switch
Printed Circuit Board
FUSE 5 X 20
N L
230V 5A Fused
Supply
N
E
Flow
Thermistor
Black shroud indicates Flow
Thermistor
Link Link
Burner
Resistor
DO NOT CONNECT
DO NOT CONNECT
DO NOT CONNECT
DO NOT REMOVE LINK
DO NOT REMOVE LINK
SL
L
Link
Link
Link
BURNER
PERMANENT LIVE
PERMANENT LIVE
Figure 5-3: VortexBlue External Module control panel wiring diagram

Section 5: ElectricalPage 18
Cylinder
Stat
N
Grant 2-Channel
Wall Mounted
Programmer ESKIT
L N E
240V
50HZ
5A
1 2 345 6 78 9 10
L 1 2 34
Frost
Stat
Pipe Stat
(If fitted)
Wiring Centre
OFF OFF ON ON
HW HT HW HT
2
C
1
2 1 3
Room
Stat
1 2 3 4 5 6 7 8 9 10 11 12 18 20 21 2215 1613 14 25 2623 2417 19
N
PL
- -
- - - - -
4 Core cable from
Controls Wiring Centre to Boiler
Brown Blue
Green/Yellow
Brown Blue
Green/Yellow
Red (Switch Live)
2-Port Zone Valve 2-Port Zone Valve
Motor HW
HTG
Link Link
Blue
Green/Yellow
Motor
Blue
Green/Yellow
Grey Grey Orange Orange
Brown Brown
Pump
Brown Blue
Green/Yellow E
N L
Brown Red
SL
Figure 5-4: VortexBlue Internal, Internal System and External Module with S-plan type control system wiring diagram
The boiler must be wired as shown in this wiring diagram, i.e. with both a permanent live (PL) supply AND a separate switched live (SL) from the heating system controls. No permanent live (PL) supply to the boiler can result in damage to the burner. This will not be covered by the boiler product guarantee.
!WARNING
Earth and some Neutral connections have been excluded for clarity. All switches are shown in the closed position.
NOTE
!

Section 5: Electrical Page 19
Cylinder
Stat
N
Grant 2-Channel
Wall Mounted
Programmer ESKIT
L N E
240V
50HZ
5A
1 2 345678 9 10
L 1 2 34
Frost
Stat
Pipe Stat
(If fitted)
Wiring Centre
Link
OFF OFF ON ON
HW HT HW HT
3-Port Mid Position
Zone Valve
2
C
1
2 1 3
Room
Stat
1 2 3 4 5 6 7 8 9 10 11 12 18 20 21 2215 1613 14 25 2623 2417 19
N
PL
- -
- - - - -
4 Core cable from
Controls Wiring Centre to Boiler
Motor
13k
2W
270k 0.25W
Brown Blue
Green/Yellow
Brown Blue
Green/Yellow
Orange Grey
White
Blue
Green/Yellow
Red (Switch Live)
Link Link
Brown Blue
Green/Yellow E
N L
1 2 345
RB1 Relay
SL
Figure 5-5: VortexBlue Internal, Internal System and External Module with Y-plan type control system wiring diagram
Earth and some Neutral connections have been excluded for clarity. All switches are shown in the closed position.
NOTE
!
The boiler must be wired as shown in this wiring diagram, i.e. with both a permanent live (PL) supply AND a separate switched live (SL) from the heating system controls. No permanent live (PL) supply to the boiler can result in damage to the burner. This will not be covered by the boiler product guarantee.
!WARNING
Do NOT connect the orange wire from the 3-port valve directly to terminal 19 (SL) on the boiler control panel (via terminals 9 and 10 in the wiring centre). When the heating demand is satised, a voltage of between 50-150V can remain on the orange wire from the 3-port valve. If connected to terminal 19 (SL) of the boiler control panel, the boiler will continue to operate in the heating mode, as if a heating demand is still present. For correct operation, the orange wire from the 3-port valve MUST be connected to the coil of the relay, as shown in the wiring diagram. See Figure 5-5. This requirement does NOT apply to S-plan type systems using 2-port zone valves. Refer to Figure 5-4.
NOTE
!

Section 5: ElectricalPage 20
Figure 5-6: VortexBlue Internal Combi control panel wiring diagram
1 2 3
E N L
4 5 6
E N L
7 8 9
E N L
10 11 12
E N L
18 20 21 22
15 16
13 14 25 26
23 24
17 19 27 28
CH PUMP EARTH
CH PUMP NEUTRAL
CH PUMP LIVE
DHW PUMP EARTH
DHW PUMP NEUTRAL
DHW PUMP LIVE
BURNER EARTH
BURNER NEUTRAL
BURNER LIVE
FLOW SWITCH
FLOW SWITCH
DHW TIMED ON
CH TIMED ON
TIMER NEUTRAL
TIMER LIVE
EXT. FROST STAT
EXT. FROST STAT
ROOM STAT
ROOM STAT
STORE
THERMISTOR
(TO FRONT POCKET)
FLOW
THERMISTOR
(TO TOP POCKET)
MAINS
1A 2A
4B 5B
Boiler
On/Off
Off Off
Constant Timed Timed
Constant
Central
Heating
Switch
Domestic Hot Water
Switch
2 C
Limit
Thermostat
Earth connection boiler top bracket
Printed Circuit Board
FUSE 5 X 20
E N L E N L
CH
Pump
DHW
Pump
N L
Black
Cable
230V 5A Fused
Supply
White
Cable
SL
N
E
Flow
Switch
Store
Thermistor
Flow
Thermistor
Black shroud indicates Flow
Thermistor
Link Link Link
L
BURNER
PERMANENT LIVE
Link
Figure 5-6 below replaces Figure 8-1 in the Combi boiler Installation Instructions.
NOTE
!