Ambirad Vision VS User guide

ASSEMBLY, INSTALLATION & SERVICING
MANUAL FOR AMBIRAD VISION®VS
RANGE OF RADIANT TUBE HEATERS
INDEX Section
Introduction and Document Index
Installation Requirements-------------------------------------------------1
Assembly Instructions------------------------------------------------------2
Commissioning Instructions----------------------------------------------3
Servicing Instructions------------------------------------------------------4
Spare Parts-------------------------------------------------------------------5
Fault Finding Guide --------------------------------------------------------6
Replacing Parts -------------------------------------------------------------7
User and Operating Instructions ----------------------------------------8
WARNINGS
AmbiRad equipment must be installed and maintained in accordance with the relevant
provisions of the Gas Safety (Installations and Use) Regulations 1998 for gas fired products.
Due account should also be taken of any obligations arising from the Health and Safety at
Works Act 1974 or relevant codes of practice. In addition the installation must be carried out
in accordance with the current IEE wiring regulations (BS 7671), BS 6896:2005 (Industrial &
Commercial) and any other relevant British Standards and Codes of Practice by a qualified
installer. All external wiring MUST comply with the current IEE wiring regulations.

2
Introduction.
Document Index.
1 Installation Requirements
1.1 Health & Safety
1.2 Model Definitions
1.3 Heater Suspension
1.4 Wall Mounting
1.5 Herringbone Systems
1.6 Clearance to Combustibles
1.7 Gas Connection & Supply Details
1.8 Electrical Connections
1.9 Ventilation Requirements
1.9.1 Unflued Radiant Heater
Mechanical Ventilation
Natural Ventilation
1.9.2 Flued Radiant Heater
Mechanical Ventilation
Natural Ventilation
1.10 Flue & Combustion Air Inlet Options
1.11 Technical Details
2 Assembly Instructions
2.1 Tools Required
2.2 Assembly Notes
2.2.1 Tubes
2.2.2 Turbulators
2.2.3 Brackets
2.2.4 U Bends
2.2.5 Couplers
2.2.6 Reflectors
2.2.7 End Caps
2.2.8 Burner Assembly
2.2.9 Fan Assembly
2.2.10 DL Condensate Box Assembly
2.2.11 HB Damper Assembly
2.2.12 HB Manifold Assembly
2.2.13 Detailed Assembly Drawings
3 Commissioning Instructions
3.1 Tools Required
3.2 Balancing the Herringbone System
3.3 Balancing a DL System
3.4 Commissioning Chart for VS 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 Induced Burner
4.7 Combustion Fan Assembly Forced Burner
4.8 Radiant Tube Servicing
4.9 Reflector Servicing
4.10 Inspection of Flue
4.11 Re-commissioning after Service
5 Spare Parts
6 Fault Finding Guide
7 Replacing Parts
7.1 Burner Controller Replacement
7.2 Air Pressure Switch Replacement
7.3 Gas Valve Replacement
8 User and Operating Instructions
8.1 To Start Heater
8.2 To Switch Off Heater
8.3 Routine Maintenance Between Service Intervals
8.4 Frequency of Servicing
at height regulations are adhered to at the
mounting heights specified.
PLEASE READ this document prior to
installation to familiarise yourself with the
components and tools you require at the various
stages of assembly.
All Dimensions shown are in mm unless
otherwise stated.
The manufacturer reserves the right to alter
specifications without prior notice.
Welcome to the new range of high efficiency
AmbiRad Vision radiant tube heaters. Local
regulations may vary in the country of use and
it is the installers responsibility to ensure that
such regulations are satisfied
All installation, assembly, commissioning and
service procedures must be carried out by
suitable qualified competent persons to the
statutory regulations in the country of use.
When assembling, installing, commissioning
and servicing is undertaken on radiant tube
heaters specified in these instructions, due care
and attention is required to ensure that working
1. Installation Requirements.
Isolate any electrical supply to the
heater and controller before proceeding. obligations arising from the Health and Safety at
Works Act 1974 or relevant codes of practice. In
addition the installation must be carried out in
accordance with the current IEE wiring
regulations (BS 7671), BS 6896:2005 (Industrial
& Commercial) and any other relevant British
Standards and Codes of Practice by a qualified
installer. Isolate all electrical supplies to the
heater & controller before proceeding.
1.1 Health and Safety
AmbiRad heaters must be installed in
accordance with the relevant provisions of the
Gas Safety (Installations and Use) Regulations
1998. Due account should also be taken of any

3
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.
1.2 Model Definitions
VSUT= AmbiRad Vision U Tube heater with
painted induced burner, stainless steel reflector
& end caps.
VSUH= AmbiRad Vision U Tube heater in
Herringbone manifold configurations with
painted induced burner, stainless steel reflector
& end caps.
VSLI = AmbiRad Vision Single Linear heater
with painted induced burner, stainless steel
reflector & end caps.
VSLF = AmbiRad Vision Single Linear heater
with painted Forced burner, stainless steel
reflector & end caps. (Nat Gas ONLY)
VSLH= AmbiRad Vision Linear heater in
Herringbone manifold configurations with
painted induced burner, stainless steel reflector
& end caps.
VSDL= AmbiRad Vision Double Linear heater
with painted induced burner, stainless steel
reflector & end caps.
VSAUT, VSAUH, VSALI, VSALF, VSALH &
VSADL = As above except: aluminised reflector
with no end caps.
1.3 Heater Suspension
See fig 3b. 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 fixing. They must be
adequately fixed and designed to carry the
whole weight of the heater. In the event of
suitable roof steelwork being unavailable,
additional steelwork should be fitted to enable
vertical hangers to be used for suspending the
heaters.
These methods are illustrated in Figure 3.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 AmbiRad
heaters are given in the table above.
1.4 Wall Mounting
These radiant tube heaters can be wall mounted
using the appropriate bracket (AmbiRad part no
WMB-13-22-38).
When using the wall mounting brackets the
heater must be inclined at an angle between 30°
and 45°.
Table 1 Angle Mounting
Figure 3.a. Angle Mounting using the Wall
mounting bracket
U Tube Linear
Heater
Size Required angle Chain length Eyebolt position Chain length Eyebolt position
15 - 30 30-35° 10 links 2 7 links 1
45° 13 links 2 9 links 1
35 - 50 30-35° 12 links 3 8 links 1
45° 16 links 3 10 links 1
Model
Horizontal Inclined / wall
mounted
15 4.0 - 5.0m 3.5 - 4.5m
20 4.5 - 7.0m 3.5 - 5.0m
25 5.0 - 8.0m 4.0 - 5.0m
30 5.5 - 9.0m 4.0 - 6.0m
35 6.0 - 10.0m 4.5 - 6.5m
40 6.5 - 11.0m 5.0 - 7.0m
45 7.0 - 12.0m 5.5 - 8.0m
50 7.5 - 13.0m 6.0 - 9.0m
Recommended Mounting Height (m)
1 .
2 . 3 .
E

4
Figure 3.b. Recommended Methods of Heater Suspension.
Where chain supports have an
angle of inclination greater
than 15° an equal and opposite
support is recommended. Vertical suspension chain ideal.
Where supports are inclined,
maximum recommended angle
of inclination is 15°.
Shackle method of attachment. Pin must be tightened by pliers.
Drop rod with formed hook. note. hook or eyebolt must be closed tight.
15° max.
ON U TUBE VARIANTS THE HEATER SHOULD SLOPE DOWNWARDS TOWARDS THE RETURN BEND AND ON
LINEAR VARIANTS SHOULD SLOPE DOWNWARDS TOWARDS BURNER BY APPROX. 10mm FOR BOTH
HORIZONTAL AND WALL MOUNTED INSTALLATIONS.
Typical Speedlink attachment.
*These angles to
be equal and not
more than 45°.
Vertical or inclined suspension on this plane is acceptable.
*
*
U TUBE SUSPENSION
*
*
** Alternative suspension
for Linear via single chain.
SINGLE LINEAR SUSPENSION
**

5
1.5 Herringbone systems (UH & LH).
The manifold system should be arranged to fall
slightly in the direction of the vacuum fan. This
ensures that any condensation formed in the
manifold on cold start and cool down is not
trapped or allowed to drain back into the heater
unit. This allows condensate to flow towards
the condensate trap located at the vacuum fan
end of the manifold system. (See figure 4a
below for condensate trap arrangement).
The manifold should be supported by chain,
stainless steel flexible wire, or other flexible
means from the roof structure to allow
movement caused by thermal expansion. For
100mm diameter manifold the maximum
distance between supports is 2.4m and 3.0m
for 150mm diameter.
Flexible couplers (supplied by AmbiRad) must
be inserted within the manifold system to allow
linear expansion to take place and prevent
stress and strain on the system.
The exhaust flue should be adequately
supported from the building structure and
installed in accordance with the British
Standard Code of Practice BS 5440: Part
1:2000 – Installation and maintenance of flues
and ventilation for gas appliances of rated input
not exceeding 70kW net (1st, 2nd and 3rd
family gases)
A condensate trap assembly must be provided
at the end of the manifold system before the
hot gas vacuum fan.
The minimum depth of the condensate
collecting chamber shall be 305mm and the
minimum depth of the condensate drain pipe
‘U’ trap shall be 457mm deep. The end cap of
the collecting chamber to be fitted with a flush
flanged tank connector. Any protrusion to be
removed leaving the inside flush with end cap.
The end cap should be sealed with silicon
jointing compound and pop riveted in position.
All condensate drains from the flue collecting
chamber to the disposal point shall be
corrosion-resistant material of not less than
22mm internal diameter. Copper or copper
based alloy shall not be used for condensation
drains. See reference BS 6896:2005.
Condensate drain pipes must be protected
against the effects of freezing.
The Type ‘0’ and Type ‘2’ vacuum fans have
bottom horizontal discharge with rectangular
connections (flanged on the type 0) and must be
mounted in that position by means of the fan
support stool onto a suitable platform or
brackets fixed to the building structure.
For details of the fan outlet fixing holes see
below.
305.0457.0
Figure 4a.
Condensate
Trap Arrangement
Figure 4c. Type ‘O’ Fan Outlet Dimensions
Figure 4d.
Type 2 Fan
Outlet Dimensions
190
213
Figure 4b. Collecting Chamber Arrangement
The manifold must be supported either
side of the flexible coupler.

6
For details of fan mounting bracket and fixing
down holes see figure 5.
Figure 4e. Conventional Flue Arrangement
Roof Exit.
Figure 4f. Conventional Flue Arrangement
Wall Exit.
Figure 4g. Stainless Steel Telescopic
Through The Wall Arrangement (available for
Type ‘O’ and Type ‘2’ fans)
Where a conventional flue is to be installed,
AmbiRad supply an aluminium transformation
piece to which a 150mm (6ins) diameter flue
must be attached.
The length of flue which may be connected to
the fan outlet must be adequately supported
from the building structure.
Figure 4h. Typical Low Fan Arrangement
305.0

7
Fig 4c/d
Fan Type O Type 2
A 124 80
B 38 35
C 175 174
D 7.1 7
E 209 125
F 153 100
G 42 25
H 239 120
J 340 210
K 332 205
L 363 215
Power (watts) 550 120
Running Current (amps) 2.6 0.8
Voltage 230V 1ph 230V 1ph
Figure 5. Vacuum fan mounting details (Type ‘O’ fan illustrated)
Hole CentersHole Centers

8
Figure 6. Typical Herringbone system
Dos and don'ts of herringbone system
Dos Don’ts
Check for corrosive industrial process in
proposed building - e.g. cleaning, electroplating,
printers using sugar powder etc.
Install system with extra 90° bends without asking
AmbiRad if the system will operate correctly.
Drain all flue ducts and seal all joints. Install flue with vertical rise without firstly fitting a
drain point at it’s lowest level.
Secure joints with pop rivets as well as sealing
compound (refer to assembly instructions). Fit fan with outlet vertical or with top horizontal discharge.
Fit drain traps before and after fans (see figs 4). Fit damper upside down or on it’s side.
Fit expansion joints before fan and at
intermediate points on the herringbone system. Fit damper wrong way round. (see fig14 page 31.)
Run drains in galvanised steel or plastic pipes.
Follow guide to combined flue heating system.
Check design pressure drop. Run drains in copper or mild steel pipework.

9
1.6 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.
Figure 7.a Diagram illustrating the clearance to combustibles (U tube shown)
VSUT / VSAUT 15/20 25/30 35/40 45/50
Above Reflector (VSUT NG ONLY) A 180 180 180 180
Above Reflector
(VSAUT and ALL LPG ONLY) A1 280 280 280 280
Above Burner / Heater Outlet B 500 500 500 500
To the Sides C 900 1000 1100 1100
Below Tubes D 1500 1700 2100 2100
Horizontally from Heater Outlet
(UNFLUED) E 1200 1200 1200 1200
End Wall (VSUT ONLY) F 500 500 500 500
A/A1
C
E
F
D
B

10
VS(A)LI; VS(A)LF; VS(A)LH; VS(A)DL 15/20 25/30 35/40 45/50
Above Reflector (VSLI/LF/LH/DL NG
ONLY) A 150 150 150 150
Above Reflector (VSALI/LF/LH/DL NG
and ALL LPG ONLY) A1 280 280 280 280
Above Burner B 500 500 500 500
To the Sides C 750 750 750 750
Below Tubes D 1500 1700 2100 2100
Horizontally from Heater Outlet
(UNFLUED) E 1200 1200 1200 1200
End Wall F 500 500 500 500
Above Heater Outlet (FLUED) G 150 150 150 150
Above Heater Outlet (UNFLUED) G1 500 500 550 550
Figure 7.b Diagram illustrating the clearance to combustibles (VSLF shown)
A/A1
B
E
F
G/G1
C
C
D

11
to the heater not to apply excessive turning
force to the internal controls.
A flexible 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 certified
hose assembly made to ISO 10380 2003,
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 flexible hose, and
not on its attachment to the pipe work. The cone
seat adapter supplied on one end of the flexible
gas hose provides a `swivel` action, and must
be fitted on the burner using a ½” BSP barrel
nipple to provide ease of disconnection for
future servicing. This assumes that the heater
and fixed gas supply to the isolating valve have
been installed.
The installation layout described below is
the only method recommended by the
institute of gas engineers, the hose
manufacturer, and AmbiRad and must only be
carried out by a qualified/competent gas
engineer.
fig.a fig.c
Arrow denotes
direction of
expansion.
Depending on the specific installation, the
flexible gas hose may be routed to the gas
cock at any of the following angles in relation to
the burner:
Vertical (fig.a)
45° angle (fig.b)
90° angle (fig.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
fig.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.
x x
fig.b
fig.d
1.7 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 qualified 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 fitted in
accordance with BS 6896:2005, 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
fitted in the gas supply close to the
heater, but not onto the burner itself.
Take care when making a gas connection
fig.e
300 +/- 50mm
Burne
50 +/- 20mm
Figure 8. Correct Installation of Flexible Gas Connection

12
1.8 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
IEE standards 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 flexible supply cable to
the power connector and routed clear of the
heater or tubes.
The flexible supply cables should be of 0.5mm²
and comply with BS 6500:2000. 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 AmbiRad approved
controls. Please refer to control manual for
siting and installation details.
Where alternative manufactures controls are
used, please refer to their instructions for their
siting and installation details.
Table 4 Gas Supply Pressures
Gas Category I2H I3P
Gas Type Natural Gas (G20) Propane (G31)
Max Supply Pressure (mbar) 25 45
Min Supply Pressure (mbar) 17 25
Nominal Pressure (mbar) 20 37
Gas Supply Connection R½ ½in BSP Internal Thread
Figure 9.a Typical VSUT/VSAUT Wiring Connections
Fan plugs into burner
Fused Spur
fig.f fig.g
The methods shown in fig.f and fig.g are unacceptable, due to undue stress on the hose & fittings.
Fused Spur
Figure 9.b Typical VSLF/VSALF Wiring Connections
Fan plugs into burner

13
Figure 10. Internal Burner Wiring Diagram.
Fused Spur
Figure 9.d Typical VSDL Wiring Connections
Fused Spur Fused Spur
Figure 9.c Typical VSLI/VSALI Wiring Connections
Fan plugs into burner via
plug/socket supplied.
Extension wiring by others
Fused Spur
MAIN
GREY
YELLOW
WHITE
FLAME SENSOR
IGNITOR
8
7
9
11
10
12
1
3
2
4
BLACK
PURPLE
WHITE
LAMPS
ON
MAINS
YELLOW
GREY
BLACK
GRN/YEL
BROWN
SOLENOID
GREEN/YELLOW
SWITCH
N.C.
N.O.
C.
GREY
EMC FILTER
MAINS
L
N
FAN
N
L
ON
BURNER
BLUE
BLUE
BLUE
VACUUM
BROWN
VALVE J.S.T.
INPUT
BLACK
1
3
2
VALVE
J.S.T.
BLUE
GREEN/YELLOW

14
1.9 Ventilation Requirements
AmbiRad tube heaters can be operated as
flued or unflued appliances in accordance with
the relevant national requirements in the
country of installation.
1.9.1 Unflued Radiant Heater
Radiant tube heaters can be operated as
unflued appliances so that the concentration of
Carbon Dioxide (CO2) at positions where the air
will be inhaled does not exceed 0.28%.
BS EN 13410:2001 is a guide to achieving this
requirement.
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, con-
sideration 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 unflued (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 installed to
meet a minimum of 1.5 air changes per hour
using appropriately sized fans and interlocked
with the heaters.
Natural Ventilation
BS EN 13410:2001 should be used to size air
vents to provide adequate 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 BS EN
13410:2001 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.
1.9.2 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, please see BS6896:2005 section
5.2.2.2.1
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. See
section 5.2.2.2.2.1.
1.10 Flue and Combustion Air Inlet -
Options
Induced Burners without Heat Exchangers
Please refer to Figure 12 for options.
Burner 2
Burner 1
Burner 3
1 phase
Isolator
Tail Pipe
1 phase 230V
Exhaust Fan
230V 50Hz 13A
Mains Supply Controller
0.75mm²
Screened
Cable
Isolator
Sensor
Zone A
Isolator
Isolator
Isolator
Figure 11. Typical VSLH/VSALH
Wiring Connections

15
Figure 12. Flue Attachment Induced Burners (VSUT or VSAUT)
A 127mm (5ins) Twin Wall Flue System
B Fan Adaptor 7177-SUB (2501/2507 fan)
or 7176-SUB (2506 fan)
C Fan 2501/2507 or 2560
D Optional Ducted Air Intake. VSI-DA
E Standard Air Intake (supplied as standard)
Ventilation requirements are as detailed
in section 1.9
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
Maximum flue length = 9.5m @ Ø125mm
Maximum no of bends = 2
All flues must terminate vertically.
For further information on flue runs, please refer
to BS 5440 pt.1 2000
For non-flued installations, delete items A and
B and rotate fan outlet to the HORIZONTAL
position away from the burner.
Products of Combustion
Products of combustionFiring tube
Ducted Air Intake
D
E A
B
C

16
Figure 13. End Attachments Forced Burners (VSLF or VSALF)
A 127mm (5ins) Twin Wall Flue System
B Tube to Flue Adaptor 75mm 201881
100mm 201882
C Flue Bend 7166
D Forced Burner
E Standard end terminal (unflued)
Ventilation requirements are as detailed in
section 1.9
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
Products of
Combustion
Firing tube
D
B
C
A E
Flued Installation
For unflued installation, fit
standard terminal supplied
using grub screw provided
Maximum flue length = 9.5m @ Ø125mm
Maximum no of bends = 2
All flues must terminate vertically.
For further information on flue runs, please refer
to BS 5440 pt.1 2000

17
1.11 Technical Details.
Tables 5a/b/c/d & e - Natural Gas (G20)
Heater
Model
Heat Input kW Gas
Flowrate
(m³/hr)
Injector
Pressure
(mbar)
Injector
Size
(mm)
Size
(h x l x w) Weight (Kg)
Fan
Rating
(A)
Fan
Type
Gross Nett
VS(A)15UT4 15.8 14.2 1.5 11.1 1.3 260x2219x670 41 0.5 2501
VS(A)15UT 15.0 13.5 1.4 10.7 1.3 240x3417x500 43 0.5 2501
VS(A)20UT 19.5 17.6 1.9 10.8 1.5 240x4142x500 50 0.5 2501
VS(A)25UT 23.5 21.2 2.3 8.0 1.8 240x5066x500 60 1.0 2507
VS(A)30UT 29.5 26.5 2.8 9.5 2.0 240x6029x500 70 1.0 2507
VS(A)35UT 36.0 32.4 3.4 9.7 2.3 260x5709x670 92 1.0 2507
VS(A)40UT 40.0 36.0 3.8 12.2 2.3 260x5709x670 92 1.0 2507
VS(A)45UT 44.0 39.6 4.2 8.9 2.9 260x7471x670 121 0.5 2560
VS(A)50UT 48.0 43.2 4.6 9.1 2.5 260x7471x670 121 0.5 2560
No of Injectors 1
Gas Connection ½ in BSP Internal thread
Flue Nominal Bore mm (in) 125 (5)
Unitary Fan Motor Details 230 volt 1 phase 50Hz
Heater
Model
Gas
Flowrate
(m³/hr)
Injector
Pressure
(mbar)
Injector
Size
(mm) Size (h x l x w) Weight (Kg)
Fan
Rating
(A) Fan TypeGross Nett
VS(A)15LF6 13.8 12.4 1.3 9.8 1.3 390x5984x315 43 0.5 2501
VS(A)15LF8 13.8 12.4 1.3 9.8 1.3 390x8022x315 53 0.5 2501
VS(A)20LF7 19.5 17.6 1.9 12.0 1.5 390x6992x315 49 1.0 2507
VS(A)20LF10-5 19.5 17.6 1.9 12.0 1.5 390x10662x315 72 1.0 2507
VS(A)25LF8 23.5 21.2 2.3 9.5 1.8 390x8022x315 53 0.5 2501
VS(A)25LF10-5 23.5 21.2 2.3 9.5 1.8 390x10662x315 72 0.5 2501
VS(A)30LF10-5 29.5 26.6 2.8 11.5 2.0 390x10662x315 72 1.0 2507
VS(A)30LF12-5 29.5 26.6 2.8 11.5 2.0 390x12652x315 84 1.0 2507
VS(A)35LF10-5 36.5 32.9 3.5 11.5 2.3 390x10892x470 103 0.5 2501
VS(A)35LF13-5 36.5 32.9 3.5 11.5 2.3 390x13492x470 126 0.5 2501
VS(A)40LF13-5 40.0 36.0 3.8 12.5 2.4 390x13492x470 126 1.0 2507
VS(A)40LF16 40.0 36.0 3.8 12.5 2.4 390x16092x470 147 1.0 2507
VS(A)45LF13-5 45.0 40.5 4.3 11.0 2.9 390x13492x470 126 1.0 2507
VS(A)45LF16 45.0 40.5 4.3 11.0 2.9 390x16092x470 147 1.0 2507
VS(A)50LF13-5 50.0 45.0 4.8 13.6 3.0 390x13492x470 126 1.0 2507
VS(A)50LF16 50.0 45.0 4.8 13.6 3.0 390x16092x470 147 1.0 2507
Heat Input kW

18
Heater
Model
Heat Input kW Gas
Flowrate
(m³/hr)
Injector
Pressure
(mbar)
Injector
Size
(mm) Size (h x l x w) Weight (Kg)
Fan
Rating
(A)
Gross Nett
VS(A)15LI8 15.0 13.5 1.4 10.7 1.3 390x7917x315 53 0.5 2501
VS(A)20LI7 19.5 17.6 1.9 10.8 1.5 390x6907x315 49 0.5 2501
VS(A)20LI10-5 19.5 17.6 1.9 10.8 1.5 390x10537x315 72 0.5 2501
VS(A)25LI8 23.5 21.2 2.3 8.0 1.8 390x7917x315 53 0.5 2501
VS(A)25LI10-5 23.5 21.2 2.3 8.0 1.8 390x10537x315 72 0.5 2501
VS(A)30LI10-5 29.5 26.6 2.8 9.5 2.0 390x10537x315 72 1.0 2507
VS(A)30LI12-5 29.5 26.6 2.8 9.5 2.0 390x12567x315 84 1.0 2507
VS(A)35LI10-5 36.0 32.4 3.4 9.6 2.3 390x10787x470 103 1.0 2507
VS(A)35LI13-5 36.0 32.4 3.4 9.6 2.3 390x13387x470 126 1.0 2507
VS(A)40LI13-5 40.0 36.0 3.8 12.2 2.3 390x13387x470 126 1.0 2507
VS(A)40LI16 40.0 36.0 3.8 12.2 2.3 390x16006x470 147 1.0 2507
VS(A)45LI13-5 44.0 39.6 4.2 8.9 2.9 390x13387x470 126 1.0 2507
VS(A)45LI16 44.0 39.6 4.2 8.9 2.9 390x16006x470 147 1.0 2507
VS(A)50LI13-5 50.0 45.0 4.8 10.0 2.5 390x13387x470 126 0.5 2560
VS(A)50LI16 50.0 45.0 4.8 10.0 2.5 390x16006x470 147 1.0 2507
Fan
Type
Heater
Model
Heat Input kW Gas
Flowrate
(m³/hr)
Injector
Pressure
(mbar)
Injector
Size
(mm) Size (h x l x w)
Gross Nett
VS(A)15LH6 15.0 13.5 1.4 10.7 1.3 390x5725x315 42
VS(A)15LH8 15.0 13.5 1.4 10.7 1.3 390x7763x315 52
VS(A)20LH7 19.5 17.6 1.9 10.8 1.5 390x6733x315 48
VS(A)20LH10-5 19.5 17.6 1.9 10.8 1.5 390x10363x315 71
VS(A)25LH8 23.5 21.2 2.3 8.0 1.8 390x7763x315 52
VS(A)25LH10-5 23.5 21.2 2.3 8.0 1.8 390x10363x315 71
VS(A)30LH10-5 29.5 26.6 2.8 9.5 2.0 390x10363x315 71
VS(A)30LH12-5 29.5 26.6 2.8 9.5 2.0 390x12393x315 83
VS(A)35LH10-5 36.0 32.4 3.4 9.6 2.3 390x10633x470 101
VS(A)35LH13-5 36.0 32.4 3.4 9.6 2.3 390x13233x470 124
VS(A)40LH13-5 40.0 36.0 3.8 12.2 2.3 390x13233x470 124
VS(A)40LH16 40.0 36.0 3.8 12.2 2.3 390x15832x470 145
VS(A)45LH13-5 44.0 39.6 4.2 8.9 2.9 390x13233x470 124
VS(A)45LH16 44.0 39.6 4.2 8.9 2.9 390x15832x470 145
VS(A)50LH13-5 50.0 45.0 4.8 10.0 2.5 390x13233x470 124
VS(A)50LH16 50.0 45.0 4.8 10.0 2.5 390x15832x470 145
Weight
(Kg)

19
Heater
Model
Heat Input kW Flowrate
(l/hr)
Injector
Pressure
(mbar)
Injector
Size
(mm)
Size
(h x l x w) Weight (Kg)
Gross Nett
VS(A)15UH 15.2 13.7 2.16 23.7 1.2 240x3417x500 42
VS(A)20UH 19.2 17.3 2.73 26.1 1.0 240x4142x500 49
VS(A)25UH 23.5 21.3 3.34 10.8 1.3 240x5066x500 59
VS(A)30UH 28.0 25.2 3.98 16.2 1.3 240x6029x500 69
VS(A)35UH 36.0 32.4 5.12 22.4 1.4 260x5709x670 91
VS(A)40UH 40.0 36.0 5.68 18.4 1.5 260x5709x670 91
VS(A)45UH 44.0 39.6 6.25 14.9 1.7 260x7471x670 120
VS(A)50UH 48.0 43.2 6.82 14.3 1.8 260x7471x670 120
Heater
Model
Heat Input kW Gas
Flowrate
(m³/hr)
Injector
Pressure
(mbar)
Injector
Size
(mm)
Size
(h x l x w) Weight (Kg)
Gross Nett
VS(A)15UH4 15.8 14.2 1.5 11.1 1.3 260x2219x670 40
VS(A)15UH 15.0 13.5 1.4 10.7 1.3 240x3417x500 42
VS(A)20UH 19.5 17.6 1.9 10.8 1.5 240x4142x500 49
VS(A)25UH 23.5 21.2 2.3 8.0 1.8 240x5066x500 59
VS(A)30UH 29.5 26.5 2.8 9.5 2.0 240x6029x500 69
VS(A)35UH 36.0 32.4 3.4 9.7 2.3 260x5709x670 91
VS(A)40UH 40.0 36.0 3.8 12.2 2.3 260x5709x670 91
VS(A)45UH 44.0 39.6 4.2 8.9 2.9 260x7471x670 120
VS(A)50UH 48.0 43.2 4.6 9.1 2.5 260x7471x670 120
Tables 6a/b/c & d. Technical Details - Propane Gas (G31)
Heater
Model
Heat Input kW Flowrate
(l/hr)
Injector
Pressure
(mbar)
Injector
Size
(mm)
Size
(h x l x w) Weight (Kg)
Fan
Rating
(A)
Fan
Type
Gross Nett
VS(A)15UT 15.2 13.7 2.16 23.7 1.2 240x3417x500 43 0.5 2501
VS(A)20UT 19.2 17.3 2.73 26.1 1.0 240x4142x500 50 1.0 2507
VS(A)25UT 23.5 21.3 3.34 10.8 1.3 240x5066x500 60 1.0 2507
VS(A)30UT 28.0 25.2 3.98 16.2 1.3 240x6029x500 70 1.0 2507
VS(A)35UT 36.0 32.4 5.12 22.4 1.4 260x5709x670 92 0.5 2560
VS(A)40UT 40.0 36.0 5.68 18.4 1.5 260x5709x670 92 0.5 2560
VS(A)45UT 44.0 39.6 6.25 14.9 1.7 260x7471x670 121 0.5 2560
VS(A)50UT 48.0 43.2 6.82 14.3 1.8 260x7471x670 121 0.5 2560

20
Heater
Model
Heat Input kW Gas
Flowrate
(l/hr)
Injector
Pressure
(mbar)
Injector
Size
(mm) Size (h x l x w) Weight (Kg)
Fan
Rating
(A)Gross Nett
VS(A)15LI6 15.2 13.7 2.16 23.7 1.2 390x5879x315 43 0.5 2501
VS(A)15LI8 15.2 13.7 2.16 23.7 1.2 390x7917x315 53 0.5 2501
VS(A)20LI7 19.2 17.3 2.73 26.1 1.0 390x6907x315 49 0.5 2501
VS(A)20LI10-5 19.2 17.3 2.73 26.1 1.0 390x10537x315 72 0.5 2501
VS(A)25LI8 23.5 21.2 3.34 10.8 1.3 390x7917x315 53 1.0 2507
VS(A)25LI10-5 23.5 21.2 3.34 10.8 1.3 390x10537x315 72 1.0 2507
VS(A)30LI10-5 28.0 25.2 3.98 16.2 1.3 390x10537x315 72 1.0 2507
VS(A)30LI12-5 28.0 25.2 3.98 16.2 1.3 390x12567x315 84 1.0 2507
VS(A)35LI10-5 36.0 32.4 5.12 22.4 1.4 390x10787x470 103 1.0 2507
VS(A)35LI13-5 36.0 32.4 5.12 22.4 1.4 390x13387x470 126 1.0 2507
VS(A)40LI13-5 40.0 36.0 5.68 18.4 1.5 390x13387x470 126 1.0 2507
VS(A)40LI16 40.0 36.0 5.68 18.4 1.5 390x16006x470 147 1.0 2507
VS(A)45LI13-5 44.0 39.6 6.25 14.9 1.7 390x13387x470 126 0.5 2560
VS(A)45LI16 44.0 39.6 6.25 14.9 1.7 390x16006x470 147 0.5 2560
VS(A)50LI13-5 48.0 43.2 6.82 14.3 1.8 390x13387x470 126 0.5 2560
VS(A)50LI16 48.0 43.2 6.82 14.3 1.8 390x16006x470 147 0.5 2560
Fan
Type
Heater
Model
Heat Input kW Gas
Flowrate
(l/hr)
Injector
Pressure
(mbar)
Injector
Size
(mm) Size (h x l x w)Gross Nett
VS(A)15LH6 15.2 13.7 2.16 23.7 1.2 390x5879x315 42
VS(A)15LH8 15.2 13.7 2.16 23.7 1.2 390x7917x315 52
VS(A)20LH7 19.2 17.3 2.73 26.1 1.0 390x6907x315 48
VS(A)20LH10-5 19.2 17.3 2.73 26.1 1.0 390x10537x315 71
VS(A)25LH8 23.5 21.2 3.34 10.8 1.3 390x7917x315 52
VS(A)25LH10-5 23.5 21.2 3.34 10.8 1.3 390x10537x315 71
VS(A)30LH10-5 28.0 25.2 3.98 16.2 1.3 390x10537x315 71
VS(A)30LH12-5 28.0 25.2 3.98 16.2 1.3 390x12567x315 83
VS(A)35LH10-5 36.0 32.4 5.12 22.4 1.4 390x10787x470 101
VS(A)35LH13-5 36.0 32.4 5.12 22.4 1.4 390x13387x470 124
VS(A)40LH13-5 40.0 36.0 5.68 18.4 1.5 390x13387x470 124
VS(A)40LH16 40.0 36.0 5.68 18.4 1.5 390x16006x470 145
VS(A)45LH13-5 44.0 39.6 6.25 14.9 1.7 390x13387x470 124
VS(A)45LH16 44.0 39.6 6.25 14.9 1.7 390x16006x470 145
VS(A)50LH13-5 48.0 43.2 6.82 14.3 1.8 390x13387x470 124
VS(A)50LH16 48.0 43.2 6.82 14.3 1.8 390x16006x470 145
Weight
(Kg)