Ambirad Vision VSX User manual

Nortek Global HVAC (UK) Limited equipment must be installed and maintained in accordance with
the requirements of the Codes of Practice or rules in force. All external wiring MUST comply with
the codes of practice or rules in force in the country of installation.
Part No. D301024
AmbiRAd Vision®VsX
Radiant tube HeateRs
instAllAtion And opeRAting mAnuAl
For use with all Vision VSX models
with Generation code BB
INDEX Section
Introduction and Document Index
Installation Requirements  
Assembly Instructions  
Commissioning Instructions  
Servicing Instructions  
Spare Parts  
Fault Finding Guide  
Replacing Parts  
Ancillaries  
User and Operating Instructions  
WARNINGS

Doc No. D301024 Page 2 of 44
Any reference made to Laws, Standards, Directives, Codes of Practice or other recommendations
governing the application and installation of heating appliances and which may be referred to in
Brochures, Specications, Quotations, and Installation, Operation and Maintenance manuals is done
so for information and guidance purposes only and should only be considered valid at the time of the
publication. The Manufacturer cannot be held responsible from any matters arising from the
revisiontoorintroductionofnewLaws,Standards,Directives,CodesofPracticeorotherrecommendations.
IMPORTANT NOTICE TO INSTALLERS
Installers should satisfy themselves that the gas pipework installation is carried out in accordance
with all current legislation, Codes of Practice and recommendations .
Additionally it may be necessary to protect the gas valves which form part of the heater or burner
assembly from potential pipe contamination particularly, but not exclusively, where copper gas
pipework is used.
In instances where copper pipework is to be used for all or part of a gas pipework installation,
including short length nal connections then we advise that installers consult with gas supplier
or provider and satisfy themselves what additional precautions may be necessary.

Doc No. D301024 Page 3 of 44
Introduction.
Welcome to the range of high eciency infra-red heaters. Local regulations may vary in the country of
use and it is the installers responsibility to ensure that such
regulations are satised
All installation and assembly procedures must be carried
out by suitable competent persons. Commissioning and
service procedures must be carried out by suitable qualied
persons to the statutory regulations in the country of use.
When assembling, installing, commissioning and servicing
is undertaken on radiant tube heaters specied in these
instructions, due care and attention is required to ensure
that working at height regulations are adhered to at the
mounting heights specied.
PLEASE READ this document prior to installation and
use. The safety of this heater is guaranteed only by the
correct usage in accordance with these instructions,
therefore it is recommended that they are retained for
future reference.
All Dimensions shown are in mm unless otherwise stated.
The manufacturer reserves the right to alter specications
without prior notice.
Document Index.
1 Installation Requirements
1.1 Compliance Notices
1.2 Certicate of Conformity
1.3 General Product Information
1.4 Model Denitions
1.5 General Requirements
1.6 Delivery and Pre-installation Checks
1.7 Health & Safety
1.8 Heater Suspension
1.9 Clearance to Combustibles
1.10 Gas Connection & Supply Details
1.11 Electrical Connections
1.12 Ventilation Requirements
1.12.1 Unued Radiant Heater
Mechanical Ventilation
Natural Ventilation
1.12.2 Flued Radiant Heater
Mechanical Ventilation
Natural Ventilation
1.13 Flue & Combustion Air Inlet
1.13.1 Important Information
1.13.2 Flue Installation
1.13.3 Condensation Considerations
1.13.4 Flue Connections
1.14 Technical Details
2 Assembly Instructions
2.1 Tools Required
2.2 Assembly Notes
2.2.1 Turbulators
2.2.2 Brackets
2.2.3 Reectors
2.2.4 Couplers
2.2.5 Burner/Heat Exchanger Assembly
2.3 Identication Check List
2.4 Prior to Assembly
2.5 Step by Step Installation
2.5.1 Tubes and Turbulators
2.5.2 Brackets, U Bolts and U Bend
2.5.3 Reectors
2.5.4 End Caps
2.5.5 Canopies
2.5.6 Canopy End Caps
2.5.7 General
2.6 Detailed Assembly Drawings
3 Commissioning Instructions
3.1 Gas Valve Adjustment
3.2 Commissioning Chart for VSX Unitary Heaters
4 Servicing Instructions
4.1 Tools required
4.2 Burner Description
4.3 Burner Removal
4.4 Burner Gas Injector Servicing
4.5 Burner Head and Electrode Servicing
4.6 Combustion Fan Assembly
4.7 Radiant Tube Servicing
4.8 Heat Exchanger Servicing
4.9 Reector Servicing
4.10 Inspection of Flue
4.11 Re-commissioning after Service
Spare Parts
Fault Finding Guide
7 Replacing Parts
7.1 Burner Controller Replacement
7.2 Air Pressure Switch Replacement
7.3 Gas Valve Replacement
7.4 Generation Codes
8 Ancillaries
9 User and Operating Instructions
9.1 To Start Heater
9.2 To Switch O Heater
9.3 Routine Maintenance Between Service Intervals
9.4 Frequency of Servicing

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1. Installation Requirements.

Isolate any electrical supply to the heater and
controller before proceeding.

1.1 Compliance notices
The Vision VSX Radiant Tube Heater detailed herewith is manufactured within a strictly controlled quality
environment within the parameters of ISO 9001.
These instructions are only valid for appliances designed to
operate in the European Union. If the country code and gas
category on the appliance data label does not match the
country of installation or the country codes and gas catego-
ry’s as shown in this instruction manual, it will be necessary
to contact the distributor or manufacturer to provide the
necessary information for the modication of the appliance
to the conditions of use for the country of installation.
The Vision VSX Radiant Tube Heater has been tested and
assessed for compliance with the following European
Directives.
Gas Appliance Directive: (90/396/ EEC)
Machinery Directive: (2006/42/EC)
Low Voltage Directive: (2006/95/EC)
Electromagnetic Compatibility Directive: (2004/108/EC)
Product Liability Directive: (85/374/EEC)
The manufacturer has taken reasonable and practical
steps to ensure that the Vision Radiant Tube Heater is
safe and without risk when properly used. These heaters
should therefore only be used in the manner and purpose
for which they were intended, and in accordance with
the recommendations detailed herewith.
The heaters have been designed, manufactured,
assembled, inspected, and tested, with safety and quality in
mind, there are certain basic precautions which the installer
and user should be aware of, and they are strongly advised
to read the appropriate sections of the information pack
accompanying the heater, prior to installation or use.
The Manufacturer supports all new products being
supplied to their customers with a comprehensive
information pack; this clearly denes mandatory
instructions for the safe installation, use, and maintenance,
of the appliance(s).
Where proprietary items are incorporated into Vision
Radiant Tube Heaters, detailed information and instructions
are also provided as part of the information pack.
It is the responsibility of the installer, owner, user, or hirer,
of the Vision Radiant Tube Heater, to ensure that they are
familiar with the appropriate information/manuals, supplied
by the manufacturer, and that they are suitably aware of the
purpose of the manuals and the safety instructions. In
addition, operators must be suitably trained in the use of
the appliance so as to ensure its continued safe and
ecient use.
The Manufacturer has a commitment to continuous
improvement and therefore reserves the right to amend or
change the specication of the Vision Radiant Tube range
subject to compliance with the appropriate European,
national, and local regulations.
Contained within the text of the manual, the words
‘Caution’ and ‘Warning’ are used to highlight certain points.
Caution is used when failure to follow or
implement the instruction(s) can lead to
premature failure or damage to the heater or
its component parts.
Warning is used when failure to heed or
implement the instruction(s) can lead to not
only component damage, but also to a
hazardous situation being created where there is a risk
of personal injury.
The Vision VSX Radiant Tube Heater conforms to the
following harmonised standards:
EN 292 -1
Safety of Machinery - Basic Concepts, General Principles for
Design Basic terminology, methodology EN 292-2
Safety of Machinery - Basic Concepts, General Principles for
Design Technical Principles and Specications.
EN 60204-1
Safety of Machinery - Electrical Equipment for Machines
Specication for General Requirements.
EN 60335-1
Safety of Household and Similar Electrical Appliances
General Requirements.
EN 55014
Limits and methods of measurement of radio disturbance
characteristics of electrical motor-operated and thermal
appliances for household and similar purposes, electrical
tools and similar electric apparatus.
EN 50165
Electrical Equipment of non-electric heating appliances for
household and similar purposes, safety requirements.

Doc No. D301024 Page 5 of 44
1.2 Certicates of conformity
Certicates are available from the manufacturer, address
details are shown on the back page.
Notied body Pin reference is : 86CL180
1.3 General product information
The Vision VSX Radiant Tube Heaters have an input range
from 20 kW to 50 kW and are suitable for ceiling hung or
wall mounted via purpose built steel supports.
The Vision VSX Radiant Tube Heaters are available only
available in U tube format, in either ued or un-ued
congurations.
Ducted air inlet kits are also available for contaminated or
dusty environments.
Each heater is tted with a burner which has been test red
and pre-set prior to despatch. The safety functions of the
burner are by way of a fully sequential control box tted to
the burner.
Note
Neither asbestos nor soft soldered joints are used in the
construction or manufacture of the Vision Radiant Tube
Heaters. The materials selected for use can withstand the
mechanical, chemical, and thermal stresses which they will
be subject to during foreseen normal use when installed in
accordance with the manufacturers recommendations.

1.4 Model Denitions

VSXUT = Vision High eciency U Tube heater with painted
powered burner, deep prole stainless steel reector and
end caps, reector canopy and end caps in Aluzink
1.5 General requirements
Caution
Before installation, check that the local distribution
conditions, nature of gas and pressure, and the current state
adjustment of the appliance are compatible.
Installation and assembly procedures must be carried
out by suitable competent persons. Commissioning and
service procedures must be carried out by suitable
qualied persons.
Warning
Unauthorised modications to the appliance, or departure
from the manufacturers guidance on intended use, or,
installation contrary to the manufacturers
recommendations may constitute a hazard.
Note
To ignore the warning a caution notices, and to ignore the
advice from manufacturer on installation, commissioning,
servicing or use will jeopardise any applicable warranty,
moreover, such a situation could also compromise the safe
and ecient running of the appliance itself, and thereby
constitute a hazard.
The installation of the appliance must meet all the relevant
European, national, and local criteria.
Prior to installation the following points should be
considered;
• The position of the heater for the optimum ecient
distribution.
• The position of the heater relative to the route of
the ue
• The position of the heater relative to the supply of
gas
• The position of the heater relative to the electrical
services, and if appropriate, any additional controls.
• The position of the heater relative to the supply of
fresh air if applicable
• The position of the heater relative to service and
maintenance requirements
Caution
The heater must not be installed within an area where the
conditions are unsuitable, e.g. where the atmosphere is
highly corrosive, has a high degree of salinity, or where
high wind velocities may aect burner operation. Suitable
protection should be provided for the appliance when it is
located in a position where it may be susceptible to
external mechanical damage from; for example, fork lift
trucks, overhead cranes etc.
1.6 Delivery and pre-installation checks.
On receipt of the heater, the following checks should be
carried out;
• The model is as per order.
• That it is undamaged.
• That it is suitable for the fuel supply.
• That it is suitable for the electrical supply

Doc No. D301024 Page 6 of 44
If any of these points are not satised then contact should
be made with the Sales Oce at Nortek Global HVAC (UK)
Limited as soon as possible by telephoning 01384 489250.
In the case of claims for damage, this must be signed for as
damaged and reported in writing within 24 hours of
delivery, in order to comply with insurance criteria.
1.7 Health and Safety

Warning
Vision radiant tube heaters must be installed in accordance
with the latest versions of all applicable standards and local
or national codes in force. The appliance must be used
only in a suciently ventilated space, as specied in these
instructions, and is not suitable for residential use.

Caution
For your own safety we recommend the use of safety boots
and leather faced gloves when handling sharp or heavy
items. The use of protective eye wear is also recommended.

1.8 Heater Suspension

See g 1b. Attachment to the heater support lugs should be
made by a ‘speed link’, D shackle or in the case of drop rods,
a closed formed hook. The hanging attachments to
overhead steelwork etc. must be purpose made to good
sound engineering practice or of a proprietary type xing.
They must be adequately xed and designed to carry the
whole weight of the heater. In the event of suitable roof
steelwork being unavailable, additional steelwork should be
tted to enable vertical hangers to be used for suspending
the heaters.
These methods are illustrated in Figure 1.b. If there are any
doubts as to the strength or suitability of roof steelwork to
which heaters are to be suspended, please refer to a
Consultant, Architect or owner of the building.
The recommended mounting heights for VSX heaters are
given in the table below.
The burner MUST be positioned on the right hand side
of the heat exchanger and mounted on a level horizontal
plane. See g 1a.
Recommended Mountain Height (m)
Model Horizontal
20 5.5 - 8.0
25 6.0 - 9.0
30 6.5 - 10.0
35 7.0 - 11.0
40 7.5 - 12.0
45 8.0 - 13.0
50 8.5 - 14.0
Caution
The burner MUST be positioned on the right hand side
of the heat exchanger and mounted on a level horizontal
plane. See g 1a
Fig. 1a. Burner positioned on right hand tube and on a
horizontal plane.

Doc No. D301024 Page 7 of 44
g. 1.b Recommended methods of heater suspension

Doc No. D301024 Page 8 of 44
Table 1 Clearance to Combustibles
VSUT 20/25/30 35/40 45/50
Above Reector A100 100 100
Above Burner / Heater Outlet B500 500 500
To the Sides C1300 1300 1300
Below Tubes D2300 2500 2500
Horizontally from Heater Outlet (un-ued) E1200 1200 1200
End Wall F700 700 700
1.9 Clearance to Combustibles
The minimum clearances to combustible materials are given in the tables below.
These minimum distances MUST be adhered to at all times
g. 2 Diagram illustrating the clearance to combustibles
A
C
E
F
D
B

Doc No. D301024 Page 9 of 44
1.10 Gas Connection and Supply

Before installation, check that the local distribution
conditions, nature of gas and pressure, and adjustment of
the appliance are compatible.

A competent or qualied engineer is required to either
install a new gas meter to the service pipe or to check that
the existing meter is adequate to deal with the rate of gas
supply required. Installation pipes should be tted
inaccordance with National Standards,h so that the supply
pressure, as stated in Table 4 will be achieved.

It is the responsibility of the competent engineer to ensure
that other relevant Standards and Codes of Practice are
complied with in the country of installation. Pipes of smaller
size than the heater inlet gas connection must not be used.
The complete installation must be tested for soundness as
described in the country of installation.

The gas union service cock MUST be tted in the gas
supply close to the heater, but not onto the burner itself
Take care when making a gas connection to the heater
not to apply excessive turning force to the internal controls.

A exible hose is installed to allow safe linear expansion
of the heater without creating undue stress on the gas
supply pipe work. It is therefore important that a tested and
certied hose assembly made to ISO 10380, supplied with
½” BSP female cone seat adapters, is installed as per these
instructions.

It is also important to ensure that expansion is taken up in
the body of the exible hose, and not on its attachment to
the pipe work. The cone seat adapter supplied on one end
of the exible gas hose provides a `swivel` action, and must
be tted on the burner using a ½” BSP barrel nipple to
provide ease of disconnection for future servicing. This
assumes that the heater and xed gas supply to the
isolating valve have been installed.

The installation layout described below must only be
carried out by a qualied/competent gas
engineer.
Depending on the specic installation, the exible gas
hose may be routed to the gas cock at any of the following
angles in relation to the burner:
Vertical (g.a); 45° angle (g.b);
90° angle (g.c)
Any other position in between these angles is acceptable.

A clearance distance ‘x’ of min 200mm must be observed to
allow side door access .
Care must be taken to observe the minimum pipe bend
diameter (minimum 250mm, maximum 350mm) & pipe
expansion distance (minimum 30mm, maximum 70mm) as
shown in g.e.

Maximum bend diameter for the 1000mm hose is 450mm.

The correct installation as shown will allow for approx
100mm of movement due to expansion.
g. 3 Correct Installation of Flexible Gas Connection

Doc No. D301024 Page 10 of 44
The methods shown in g.f and g.g are unacceptable, due to undue stress on the hose & ttings.
Table 2 Gas Supply Pressures
Gas Category Gas Type Nominal Pressure
(mbar)
Max Supply Pressure
(mbar)
Min Supply Pressure
(mbar)
I2H/I2E Nat Gas (G20) 20 25 17.5
I2E(R)B/I2Er Nat Gas (G20/25) 20/25 25/30 17.5/20
I2L Nat Gas (G25) 25 30 20
Fan plugs into burner
Fused Spur
g.4 Typical wiring connections
1.11 Electrical Connections

This appliance must be earthed.
Supply 230V 50Hz single phase.
Standard heater 116W. Herringbone 16W.
Current rating 0.55 amp max (inductive).
Fuse: external 3 amp.

All electrical work should be carried out to
National Standards and local regulations by
a competent electrician.

The electrical connection to the heater is
made by means of a three pin plug-in power connector.
Live, neutral and earth connections should be made via a
exible supply cable to the power connector and routed
clear of the heater or tubes.

The exible supply cables should be of 0.5mm² and comply
with National Standards. The wires in the mains
lead are coloured in accordance with the
following code: Green & Yellow Earth;
Blue Neutral; Brown Live

It is recommended the heater or group of
heaters are controlled by thermostats, a time
switch and if required manual control switches
and a frost thermostat.

We recommend use of Nortek Global HVAC
approved controls. Please refer to separate control
manual for positioning and installation details.

Where alternative manufactures controls are used, please
refer to their instructions for the siting and installation
details.
Gas Supply Connection R½ ½in BSP Internal Thread

Doc No. D301024 Page 11 of 44
g.5a VSX Internal Burner Wiring Diagram (Optional Webber solenoid shown in dotted)
g.5b VSX Internal Burner Wiring Diagram c/w Lockout Circuit (Optional Webber solenoid shown in dotted)
KEY
BL = BLUE
BR = BROWN
G/Y = GREEN/YELLOW
GR = GREY
R = RED
O= ORANGE
W= WHITE
Y= YELLOW
1
10
234 5 67 8 9
11 12 13 14 15 16 17 18
1
10
234 5
67 8 9
R
GR
BR
HT
230V/50Hz~
MAINS INPUT
3 WAY
AIR SOLENOID
BODY
FAN
LAMP
RED
AMBER
LAMP
BL
Y
BR S
E
AIR
PRESSURE
SWITCH
COMBINATION
GAS
VALVE
2
IGNITION/
RECTIFICATION
O
BR
R
BR
BL BL
CONTROL
BOX
BL
1
1
2
3
4
5
G/Y
W
Y
R
GR
BK
BL
BR
G/Y
N
L1
N
L1
KEY
BL = BLUE
BR = BROWN
G/Y = GREEN/YELLOW
GR = GREY
R = RED
O = ORANGE
W = WHITE
Y = YELLOW
1
10
234 5 67 8 9
11 12 13 14 15 16 17 18
1
10
234 5
67 8 9
R
GR
BR
230V/50Hz~
MAINS INPUT
BODY
FAN
LAMP
RED
AMBER
LAMP
BL
Y
BR
E
AIR
PRESSURE
SWITCH
O
BR
BR
BL BL
BL
BL
BR
N
G/Y
N
L1
BL
R
R
A2 A1
HT
COMBINATION
GAS
VALVE
IGNITION/
RECTIFICATION
CONTROL
BOX
1
2
3
4
5
G/Y
W
Y
R
GR
BK
3 WAY
AIR SOLENOID
S
2
1
W R
Y
NC
C
NO
N
L1
LOCKOUT
W
Y
R
L1

Doc No. D301024 Page 12 of 44
1.12 Ventilation Requirements

Vision VSX tube heaters can be operated as ued or unued
appliances in accordance with the relevant national
requirements in the country of installation.
1.12.1 Un-ued Radiant Heater

Radiant tube heaters can be operated as un-ued
appliances so that the concentration of Carbon Dioxide
(CO2) at positions where the air will be inhaled does not
exceed 0.28%. EN 13410 is a guide to achieving this require-
ment.
If the building air change rate exceeds 1.5 per hour or if the
heat input is less than 5W/m³, no additional ventilation is
required.

In addition to the ventilation requirements, consideration
needs to be given to the possibility of condensation
forming on cold surfaces.

It should be noted that the clearance distance around the
burner increases when the unit is operated un-ued (see
section 1.6). It should be ensured that the combustion gases
do not impinge on any combustible materials.

Mechanical Ventilation
Mechanical ventilation must be rated a minimum 10m³/h
per kW input using approx. sized fans and interlocked with
heaters.

Natural Ventilation
EN 13410: should be used to size air vents to provide ade-
quate ventilation, an example of this calculation is given
below:
Site Details:
20°C Internal Operating Temperature
0°C Outside Air Temperature
5m between high and low level vents

Following the sizing procedure in EN 13410 gives an air exit
velocity of 1.6m/s. This equates to a free area vent at both
high level and low level of 17.36cm²/kW free area.

1.12.2 Flued Radiant Heater

In buildings having an air change rate of less than 0.5 per
hour, additional mechanical or natural ventilation is
required. For detailed information, refer to local or National
Standards.

Mechanical Ventilation
Mechanical ventilation must be installed to meet a
minimum of 0.5 air changes per hour using appropriately
sized fans and interlocked with the heaters.
Natural Ventilation
Low level ventilation openings with a free area of at least
2cm²/kW shall be provided.

1.13 Flue and Combustion Air Inlet
1.15.1.1 Details
A suitable ue system complying with EN1856-1 (type T250
N1 D Vm L11040 O50) should be used.
Flue size 125mm diameter twin wall.

Flue systems can run either vertically or horizontally up to
a maximum length of 9.5m (including up to 2 x 90° bends
plus the terminal). The minimum ue length shall be 1m.

The ue system must be terminated vertically and in
accordance with local regulations, National Standards, and
the ue system manufacturers instructions as supplied with
the ue.
1.13.2 Installation

Connection to the appliance which is not connected to
the fuel supply may be carried out be a competent person.
However, connection to an appliance that is connected to
the fuel supply must be carried out by a registered installer.
If the ue passes through a wall, ceiling, or roof made from
combustible material then it has to be sleeved so as to
provide a minimum of a 50mm void between the exterior
of the ue and the internal wall of the sleeve. A minimum
of 50mm must be maintained as a clearance distance to all
other combustible materials.

The manifold should be supported by chain, stainless steel
exible wire, or other exible means from the roof structure
to allow movement caused by thermal expansion.

The maximum distance between supports is 1.5m for
horizontal runs.
Wall bands are not load bearing and give lateral support
only. If used, wall bands should be tted every 3m on
vertical runs to ensure the system is rigidly held. The system
should be braced immediately below passing through
the roof line to ensure the ashing does not suer lateral
pressures.


Doc No. D301024 Page 13 of 44
The maximum height unsupported above the roof line is
1.5m. Where a joint is above the roof line it should be
determined that in extreme wind conditions this joint
would not be over exerted. If there is any doubt then a
guy wire should be used. Beyond this guy wires should be
installed every meter.

The POCED (Products Of Combustion Evacuation Ducts)
is capable of withstanding its own weight when installed
in accordance with these instructions and the Regulations
shown below.

The exhaust ue should be adequately supported from the
building structure and installed in accordance with National
Codes, and the ue system manufacturers instructions as
supplied with the ue.

Condensate drain pipes must be protected against the
eects of freezing.
1.13.3 Condensation

When designing the ue system the prevention of the
formation and entrapment of condensation must be a key
consideration.

Horizontal ue, where tted, should be tted ensuring a
slight gradient approx 5° towards the terminal. Due
consideration should be given to the possibility of
condensation from the ue freezing on any footpaths that
pass below the terminal.

Where condensation is unavoidable traps should be
included to encourage the condensates to ow freely to
a point from which they may be released, preferably into
a gully. The condensate pipe from the ue to the disposal
point must be made from corrosion resistant pipe of not
less than 25mm internal diameter.
1.13.4 Flue Connection
All pipe lengths and ue gas carrying components are
joined together by a twist lock, bayonet system. The system
should be installed with the visible male collar pointing
upwards, this is rearmed by the directional arrow
pointing upwards, indicating the directional ow of ue
gases. Taping of the joints is unnecessary.

Doc No. D301024 Page 14 of 44
Figure 6.a. Forced Burner with Heat Exchanger (Standard Flue)
For ued products of combustion and no ducted air
Maximum ue run = 9.5m @ Ø125mm
Maximum no of bends = 2
All ues must terminate vertically.
For further information on ue runs, please refer to section
1.9.1 and National Standards.
Ducted air must be used in locations where there is
airborne dust or where there is a polluted atmosphere. e.g.
Chlorinated Vapours.
Maximum length = 9m
Minimum diameter = 100mm
Maximum no of bends = 2 Ventilation requirements are as detailed in section 1.7
Items
W1 127mm (5ins) to 100mm (4ins) Flue Adaptor
W2 127mm (5ins) Twin Wall Flue Pipe
W6 100mm (4ins) Flexible Hose
X2 Forced Burner
X3 Heat Exchanger
Z100mm (4ins) Clips x2

Doc No. D301024 Page 15 of 44
Maximum ue run = 9.5m @ Ø125mm
Maximum no of bends = 2
All ues must terminate vertically.
For further information on ue runs, please refer to section
1.10.1 and National Standards.
Ducted air must be used in locations where there is
airborne dust or where there is a polluted atmosphere. e.g.
Chlorinated Vapours.
Maximum length = 9m
Minimum diameter = 100mm
Maximum no of bends = 2 Ventilation requirements are as detailed in section 1.7
Items
W5 Shroud for unued heater installation
W6 100mm (4ins) Flexible Hose
X2 Forced Burner
X3 Heat Exchanger
Z100mm (4ins) Clips x2
Figure 6.b. Forced Burner with Heat Exchanger (No External Flue)
For ducted air and products of combustion to ventilated area

Doc No. D301024 Page 16 of 44
Maximum ue length = 9.0m @ Ø125mm
Maximum no of bends = 2
All ues must terminate vertically.
For further information on ue runs, please refer to section
1.10.1 and National Standards.
Ducted air must be used in locations where there is
airborne dust or where there is a polluted atmosphere. e.g.
Chlorinated Vapours.
Maximum length = 9m
Minimum diameter = 100mm
Maximum no of bends = 2 Ventilation requirements are as detailed in section 1.7
Figure 6.c. Forced Burner with Heat Exchanger (with Concentric Flue)
For ued products of combustion and
ducted air via concentric pipe.
IMPORTANT NOTE
This option is a type B23 ue system
with ducted air and is not a room sealed
balanced ue product.
Items
W2 Flue Extension optional (0.25m/0.5m/1.0m)
W4 Concentric Flue Terminal
W6 100mm (4ins) Flexible Hose
X2 Forced Burner
X3 Heat Exchanger
Z100mm (4ins) Clips x2

Doc No. D301024 Page 17 of 44
1.14 Technical Details
Tables 3 - a / b Natural Gas (G20 & G25)
Country Approved Gas Category
FR I2Er
BE I2E(R)B
AT, BG, CH, CY, CZ, DK, EE, ES, FI, GB, GR, HR, IE, IT, LT, LV, NO,
PT, RO, SE, SI, SK, TR I2H
LU, PL, RO I2E
NL I2L
Number of Injectors 1
Gas Connection ½ in BSP Internal Thread
Flue Nominal Bore mm (in) 125 (5)
Fan Motor Voltage 230V 1ph 50Hz
Heater Model Mass Flow Rate of Flue
Gases (kg/s)
Flue Pressure (Pa)
Max Flue Resistance Flue Gas Temp (°C)
VSX20UT 0.0116
35 - 42 190 - 250
VSX25UT 0.0132
VSX30UT 0.0133
VSX35UT 0.0166
VSX40UT 0.0173
VSX45UT 0.0196
VSX50UT 0.0220
Table 4. Flue Details
Heater Model
Heat Input
kW
Gross
G20/G25
Gas
Flowrate
m3/hr)
G20/G25
Injector
Pressure
(mbar)
Injector
Size
(mm)
Size
(h x l x w)
Weight
(Kg)
Fan Rating
(A) Fan Type
VSX20UT2M 20.0 1.9 / 2.2 10.0 / 14.8 1.7 450X4047X746 114 0.5 2501-DE
VSX25UT2M 25.0 2.4 / 2.8 9.4 / 14.1 1.9 450X4047X746 114 1.0 2507-DE
VSX30UT2M 30.0 2.9 / 3.3 10.5 / 15.2 2.0 450X4047X746 114 1.0 2507-DE
VSX30UT3M 3.0 2.9 / 3.3 10.5 / 15.2 2.0 450X5927X746 158 1.0 2507-DE
VSX35UT3M 36.0 3.4 / 4.0 12.3 / 17.4 2.3 450X5927X746 158 1.0 2507-DE
VSX40UT3M 40.0 3.8 / 4.4 12.8 / 18.0 2.4 450X5927X746 158 0.5 2560
VSX45UT3M 44.0 4.2 / 4.9 11.6 / 16.1 2.9 450X5927X746 158 0.5 2560
VSX45UT4M 44.0 4.2 / 4.9 11.6 / 16.1 2.9 450X7692X746 205 0.5 2560
VSX50UT4M 49.5 4.7 / 5.5 12.8 / 18.0 2.5L 450X7692X746 205 0.5 2560

Doc No. D301024 Page 18 of 44
2. Assembly Instructions.

PLEASE READ this section prior to assembly to
familiarise yourself with the components and tools
you require at the various stages of assembly. Carefully
open the packaging and check the contents against the
parts and check list.

The manufacturer reserves the right to alter
specications without prior notice.

Please ensure that all packaging is disposed of in a
safe environmentally friendly way.

For your own safety we recommend the use of safety
boots and leather faced gloves when handling sharp or
heavy items. The use of protective eye wear is also
recommended.

2.1 Tools Required.

The following tools and equipment are advisable to
complete the tasks laid out in this manual.

Suitable alternative tools may be used.

2.2 Assembly Notes.
Please read these assembly notes in conjunction with
the correct assembly drawings (gs 7 to 10).

2.2.1 Turbulators
Ensure the correct length and quantity are inserted
into their respective correctly identied tube(s) as detailed
in the assembly drawings.
2.2.2 Brackets
Tighten clamping ‘U’ bolt arrangement to tubes ONLY
WHERE STATED on the assembly drawings.
2.2.4 Reectors.
All reectors AND canopies must be positioned/
attached to the brackets exactly as detailed in the assembly
drawings.
Remove the protective plastic coating.
2.2.5 Couplers.
Locate and position tube couplers at the end of the tubes.
Ensure socket heads are facing outwards & the pre-tted
bolts in the couplers line up with the locating holes in the
tubes.
Ensure the bolts are not over tightened.
Trestles Leather Faced
Gloves
Pozidrive
Screwdrivers
10,12 & 13mm
Spanners
Tape Measure 4 & 5mm Allen
Keys

Doc No. D301024 Page 19 of 44
2.2.6 Burner and Heat Exchanger Assembly.
Slide the burner assembly onto the RIGHT HAND
TUBE when viewed from above, ensuring it is fullY engaged.
Slide heat exchanger onto the LEFT HAND TUBE when
viewed from above, ensuring it is fully engaged. The hose
connections should face vertically.
Secure both assemblies with grub screws.
2.3 Identication check list
VSX2M
20/25/30
VSX3M
30/35/40
/45
VSX4M
45/50
Burner
1x 1x 1x
Heat
Exchanger 1x 1x 1x
U Bend
1x 1x 1x
Inner Reector
2x 3x 4x
Outer Canopy
2x 3x 4x
Brackets
3x 4x 5x
No.5 Torque
Screw 13x 13x 15x
M6 Mud
Washer 12x 16x 20x
VSX2M
20/25/30
VSX3M
30/35/40
/45
VSX4M
45/50
Inner End
Caps 2x 2x 2x
Outer End
Caps 1x 1x 1x
Tubes
2x 2x 2x
Turbulators
2x 3x 3x
Couplers
4x 4x 4x
M8 U Bolt
6x 8x 10x
M8 Full Nuts
16x 22x 28x
M4 x 10
Pozi Setpins 7x 8x 9x

Doc No. D301024 Page 20 of 44
2.5 Step by step instructions
2.5.1 Tubes and Turbulators
2.5.1.1 Locate and position tubes on trestles.
After deciding which end will have the burner, mark out the position
of the rst bracket as shown in the assembly drawings section.
Slide brackets over tubes as shown.
2.5.1.2 VSX4M only: Locate & position the two shorter tubes and
ax to tubes using couplers.
Keeping the tubes in line, tighten the couplers evenly until the tubes
cannot be turned in the couplers.
VSX2M
20/25/30
VSX3M
30/35/40
/45
VSX4M
45/50
M6 Washer
4x 6x 8x
M6 Full Nut
6x 10x 14x
M6 x 35 Setpin
4x 6x 8x
VSX2M
20/25/30
VSX3M
30/35/40
/45
VSX4M
45/50
M4 Full Nut
1x 2x 3x
M4 Washer
7x 8x 9x
M6 x 15
Setpin 2x 4x 6x
2.4 Prior to assembly
• Ensure the area in which you are working is safe and clear of obstructions.
• Identify with the components in the check list and in which order they will be assembled.
• Arrange the trestles* in a straight line to allow for length of tubes.
• Remove all protective plastic from underside of Stainless Steel Reectors / inside of End Caps.
* if saw horses cannot be located, ensure any alternative is sound and can carry the heater weight.
Methodology: To cater for the expansion of the ring leg, all U bolts on the ring leg (except the one closest to U bend) are
to be loose as described below. All reectors, tubes, brackets and canopies are bolted together.
0x 0x 2x
2x 2x 2x
0x 0x 2x