Ambirad UDSA 008 Guide

0502UDSAAMEN
UDSA 008 - 100
Gas fired Balanced flue / Fan assisted
flue unit heater
INSTALLATION
COMMISSIONING
SERVICING
TheseappliancesmeetthefollowingECDirectives:
DIR CE 90/396/EEG:GAD
DIR CE 89/336/EEG:EMC
DIR73/23/EEG:LVD
DIR89/392/EEG:MD
Please read this document carefully before commencing installation, commissioning and/or servicing.
Leave it with the user or attached to the appliance or gas service meter after installation.
WARNING:
Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or
death. All work must be carried out by appropriately qualified persons.
Ambi-Rad Limited, Fens Pool Avenue, Brierley Hill, West Midlands DY5 1QA (United Kingdom)
Tel : [phone] Fax : [phone]

0502UDSAAMEN, Pag. 2/35
INDEX
Warnings ......................................................................................................................... 3
1. General...................................................................................................................... 4
2. Installation codes ...................................................................................................... 4
3. Warranty.................................................................................................................... 4
4. Uncrating and preparation......................................................................................... 4
5. Dimensions ............................................................................................................... 5
6. Technical data ........................................................................................................... 7
7. Flueing requirements ................................................................................................. 8
8. Unit heater location ................................................................................................... 12
9. Hanging the unit ........................................................................................................ 13
10. Gas piping and pressures.......................................................................................... 15
11. Electrical supply and connections............................................................................. 16
12. Check installation and start up .................................................................................. 18
13. Maintenance schedule ............................................................................................... 23
14. Heat exchanger maintenance ..................................................................................... 24
15. Burner maintenance ................................................................................................... 25
16. Burner orifice ............................................................................................................ 27
17. Ignition system .......................................................................................................... 27
18. Fan motor ................................................................................................................. 28
19. Fan motor, fan blades and guard .............................................................................. 28
20. Venter motor and wheel ............................................................................................ 29
21. Gas valve...................................................................................................................31
22. Combustion air pressure switch................................................................................ 32
23. Limit controls ............................................................................................................ 32
24. Flue and combustion air system ............................................................................... 34
25. Troubleshooting ........................................................................................................ 34
26. Parts list .................................................................................................................... 35

0502UDSAAMEN, Pag. 3/35
FOR YOUR SAFETY
What to do if you smell gas:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your
building.
• Immediately call your gas supplier.
• Evacuate all personnel.
Warnings
FOR YOUR SAFETY
Do not store or use petrol or other flammable vapours and liquids in the
vicinity of this or any other appliance.
WARNING: Improper installation, adjustment, alteration, service, or
maintenance can cause property damage, injury, or death. Read the
installation, operation, and maintenance instructions thoroughly before
installingorservicingthisequipment.
WARNING: Do not use this appliance if any part has been immersed in water.
Immediatelycalla qualifiedservicetechnician toinspectthe applianceand replace
any gas control that hes been immersed in water.
WARNING : Gas-fired appliances are not designed for use in hazourdous
atmospheres containing flammable vapors or combustible dust, in atmospheres
containing chlorinated or halogenated hydrocarbons or in applications with
airborne silicone substances.
WARNING : Should overheating occur, or the gas supply fail to shut off, shut
off the manual gas valve to the appliance before shutting off the electrical
supply.

0502UDSAAMEN, Pag. 4/35
3. Warranty
4. Uncrating
and
preparation
Warranty is void if :
a. Wiring is not in accordance with the diagram furnished with the heater.
b. The unit is installed without proper clearances as soon as clearances are
required regardless of the material being combustible.
c. A fan model is connected to a duct system or if the air delivery system is
modified.
These units must be installed in accordance with BS6230 or BS5440 as appropri-
ate plus all local building codes.
1. General Models UDSA 008 through 100 are design certified to the CE EN1020 standard for
usein industrial and commercial installations only.Allmodelsand sizes are available
for use with either natural, propane or butane gas. The type of gas, the input rate
and the electrical supply requirement is shown on the heater rating plate. Check the
rating plate to determine if the heater is appropriate for the intended installation.
This installation manual is shipped with the heater. Verify that the literature is cor-
rect for the heater being installed. If the manual is incorrect for the heater, contact
thesupplier before beginning installation.
The instructions in this manual apply only tothe models listed.
Installation should be done by a suitably qualified installer in accordance with these
instructions. The installer is responsible for the safe installation of the heater.
2. Installation
codes
This unit was test operated and inspected at the factory prior to crating and was in
proper operating condition. If the heater has incurred damage in shipment, document
the damage with the transport company and contact your supplier.
Check the rating plate for the gas and electrical specifications of the heater to be
sure that they are compatible with the gas and electric supplies at the installation site.
Read this booklet and become familiar with the installation requirements of your
heater. If you do not have knowledge of local requirements, check with the gas
supplier and any other local agencies who might have requirements concerning this
installation.
Before beginning, make preparations for necessary supplies, tools, and manpower.
If the installation includes optional vertical louvers or downturn nozzle etc.,
install these options before the heater is suspended. Follow the instruc-
tions included in the option package.

0502UDSAAMEN, Pag. 5/35
5. Dimensions & Clearances (horizontal orientation=standard)
Topview
Frontview
Legend:
1. Combustion air inlet
2. Flue connection
3. External gas connection
4. Electrical connections
5. Service panel
Rear view
(all mod. except 035,043,050)
Side view
Rear view
( only mod. 035,043,050)
Figure 1
TypeABCDEFGHJ KLMNPQR
008 - 011 307 700 267 404 696 546 131 191 129 67 85 413 16 98 350 120
015 - 020 383 700 343 404 723 546 200 191 139 122 86 413 16 98 350 120
025 - 030 586 700 546 404 771 546 368 191 222 122 121 413 16 98 350 140
035 - 050 510 971 456 601 1129 897 371 195 126 166 121 623 33 149 600 140
055 - 064 663 971 609 601 1138 897 354 207 150 166 204 623 33 149 600 225
073 - 100 865 1040 812 651 1138 897 562 213 299 186 204 673 33 149 600 225
Table 1 : Dimensions (mm)

0502UDSAAMEN, Pag. 6/35
Clearances (mm) Units must be installed so that the minimum clearances in the following table are
provided for combustion air space, inspection and service and for proper spacing from
combustiblematerials.
Attention :
The clearance distance from the flue system must be minimum 150mm at all points !
Combustion air
supply and flue
system
diameters
Diameter gas
connection
Model 008 011 015 020 025 030 035 043 050 055 064 073 085 100
Ø flue/ air inlet
(mm) 80 80 80 80 100 100 100 100 100 130 130 130 130 130
Ø gas con-
nection 1/2" 1/2" 1/2" 1/2" 1/2" 1/2" 3/4" 3/4" 3/4" 3/4" 3/4" 3/4" 3/4" 3/4"
Table 2 : Clearances (mm)
Model X Y Z (*) U V
8 -30 450 50 50 50 850
35 -100 450 100 100 100 850
Table 3 :
(*) : Heaters can be base mounted on suitable non combustible supports.

0502UDSAAMEN, Pag. 7/35
6. Technical data
Table 4 : Technical data
1) Gas Appliance Classifications for Approved Venting Methods based on CEN-report CR1749:1995.
2) There is a difference between the gas connection diameter and the diameter of the supply line. Always use the most adequate dia of the supply line
to minimize the pressue drop through the gas pipes - if necessary, reduce the diameter of the supply line at the inlet of the unit.
3) Height from floor to bottom surface of heater. These are recommendations only. Positioning of unit heaters for proper performance is application
dependent. Operation is affected by other air moving equipment in the space, obstructions to the airflow, draughts and/or close proximity to doors
or windows, etc ... Care should be taken to avoid mounting the heaters above these recommendations, unless downturn nozzle options are used, as
significant stratification may occur resulting in poor floor coverage and higher energy losses through the roof structure.
4) Isothermal conditions +/-20°C ambient air temperature, discharge louvres zero deflection, v = 0,5m/s. The air throw will be influenced by the height
of the building, mounting height of the unit, ambient temperature & adjustment of the louvres.
5) Sound pressure measured in dB(A) : at 5m distance of the heater with A=160m² & Q=2
TYPES 035-100
Type 035 043 050 055 064 073 085 100
Gas categories
Comb. Air and Flue, t
y
pe B instal.1
Comb. Air and Flue,type C instal. 1
Flue & combustionair connectioncollars mm 100 100 100 130 130 130 130 130
Heatinput(Hs) kW 42,2 50,8 58,6 66,0 77,7 88,0 102,7 117,3
Heatinput(Hi) kW 38,0 45,8 52,8 59,5 70,0 79,3 92,5 105,7
Heatoutput kW 34,9 42,1 48,6 54,7 64,4 73,0 85,1 97,0
Thermalefficiency % 92 92 92 92 92 92 92 92
Gas consumption
nat. gas G25 m3/h 4,02 4,85 5,59 6,30 7,41 8,39 9,79 11,18
prop. G31 kg/h 2,96 3,57 4,12 4,64 5,46 6,18 7,21 8,24
Gas connection size (not suppy line) 2
Temperaturerise K 29 28 282828282828
Airflow m3/h 3510 4535 5180 5830 6810 7770 9065 10360
Motor speed rpm 950 950 950 950 900 900 900 900
Recommended mounting height 3m
Horizontal air throw 4m 25 28 303033353639
Sound pressure 5dB(A) 55 54 555656585959
Electricalservice (protection class IP20)
Totalelectricalrating W 333 490 490 490 678 848 848 848
Weight(net) kg 88 99 99 112 118 143 158 168
230/240V 1N ~ 50Hz
3/4"
B22
C12, C32, C42, C52, C62,C82
3,5 4,0
II2H3+
TYPES 008 - 030
Type 008 011 015 020 025 030
Gas category
Comb. Air & Flue, t
y
pe B instal.1
Comb. Air & Flue, t
y
pe C instal.. 1
Flue & combustion air connection collars mm 80 80 80 80 100 100
Heat input (Hs) kW 8,8 13,2 17,6 22,0 30,8 35,2
Heat input (Hi) kW 7,9 11,9 15,9 19,8 27,8 31,7
Heatoutput kW 7,3 11,0 14,6 18,2 25,5 29,2
Thermal efficiency % 92 92 92 92 92 92
Gas consumption rate
nat. gas G20 m3/h 0,84 1,26 1,68 2,10 2,94 3,36
prop. G31 kg/h 0,62 0,93 1,24 1,55 2,16 2,47
Gas connection size (not supply line size) 2
Temperature rise K 32 32 32 32 32 32
Airflow m3/h 680 1020 1360 1700 2385 2725
Motor speed rpm 1390 1390 1450 1450 930 930
Recommanded mounting height 3m
Horizontal air throw 4 m 8 10 13 16 20 22
Sound pressure 5dB(A) 474647485051
Electricalservice (protection class IP20)
Total electrical rating W
Weight(net) kg 303338405660
II2H3+
C12,C32,C42,C52,C62,C82
B22
121 126 273
1/2"
230/240V 1N ~ 50Hz
2,5 3,0 3,5

0502UDSAAMEN, Pag. 8/35
7. Flue
requirements Model UDSA heaters may be installed as Type-B and Type-C installations.
Flue must be in accordance with BS6230 or BS5440. Local requirements may
apply in addition to national requirements. These unit heaters are designed to oper-
ate safely and efficiently with either a horizontal or vertical flue system when in-
stalled with the specific requirements and instructions.
If this heater is replacing an existing heater, be sure that the flue is sized properly
for the heater being installed and that the existing flue is in good condition.Aprop-
erly sized flue system is required for safe operation of the heater. An improperly
sized flue system can cause unsafe conditions and/or create condensation.
The air heaters may be installed as a balanced flue (type C) heater requiring both a
combustion air inlet duct and a flue pipe or as a power vented heater (type B) (the
combustion air is taken from the space where heater is installed), which requires
only a flue pipe exhausting to outdoors.
All products of combustion must be flued to outdoor atmosphere.
Each heater installed as a type B appliance must be fitted with an individual flue
pipe and the combustion air inlet opening is provided with a protection grill. Each
heater installed as a type C appliance must be fitted with an individual combustion
air/flue pipe system. Type C2 appliance, with single duct system for supply of
combustion air and evacuation of flue gasses, are not allowed.
Flue pipe diameters and maximum pipe lengths in table 5 apply to both horizontal
and vertical systems. Add all straight sections and equivalent lengths for elbow.
The total combined length must not exceed the maximum flue length.
Diameter & maximum
flue pipe lengths
IMPORTANT :
The flue must be installed in accordance with national and local regula-
tions. Failure to provide proper flueing could result in death, serious in-
jury and/or property damage. The air heater must be installed with a flue
to the outside of the building. Safe operation of any power vented gas
apparatus requires a properly operating flue system, correct provision for
combustion air and regular maintenance and inspection.

0502UDSAAMEN, Pag. 9/35
Flues for power
vented installations
(type B appliances)
Figure 2 : Approved appliances type B
B22 - roof
Flue outlet Venteroutletattachment requirements:
Depending on the size of flue pipe as determined in table 5, attach either the flue
pipe directly to the collar or a taper-type connector.
flue pipe 80 100 130
inlet pipe 80 100 130
flue pipe 9 9 9
inlet pipe 9 9 9
flue pipe 0.75 0.75 0.75
inlet pipe 0.75 0.75 0.75
flue pipe 1.5 1.5 1.5
inlet pipe 1.5 1.5 1.5
mmHeater socket & pipe dia
m
025,030,035,043
050, 055,064,073,085,100
Equivalent length of 90° elbow
Model UDSA 008,011,
015,020
m
m
Max. straight length (with wall/roof
terminal)
Equivalent length of 45° elbow
Table 5 : maximum flue system pipe lengths
• Use only one diameter of flue pipe on an installation.
• Minimum flue is 1m.
B22 - wall
If the air heater is to be installed as a type B appliance, air for combustion will be
taken from within the space where the heater is installed. Ensure that an adequate
air supply for combustion and ventilation is provided within the building in accor-
dance with BS6230/BS5440 plus other relevant regulations & rules in force.
Single wall flue seamless aluminium or stainless steel pipes are required.All joints
mustbe sealed to prevent products of combustion from leaking into thebuilding. If
the flue passes through a combustible element of the building it must be enclosed
byasleeve ofnon-combustible materialandseparated fromthe sleevebya minimum
of 25 mm air break. The temperature of any combustible material near to the flue
must not exceed 65°C when the heater is in operation. The flue must be at least
150 mm away from any combustible material.
Single wall flue pipe exposed to cold air or run through unheated areas should be
insulated. Where condensation is unavoidable, provision must be made for the
condensation to flow freely to a point to which it can be released, i.e. a drain or
gully.The condensation drain from the fluemust beconstructed fromnon-corrodible
material not less than 20 mm diameter. Copper or copper based alloys must not be
used for condensation drains.

0502UDSAAMEN, Pag. 10/35
Figure 3 :
Type B appliances : Combustion air and flue pipe sockets
1) Flue pipe outlet collar
2)Combustion air inlet opening
all mod., except. 035,043, 050 only mod. 035, 043 & 050
Air supply It is important to ensure that there is an adequate air supply at all times for both
combustion and heating requirements. Modern buildings involve greater use of in-
sulation, improved vapour barriers, and weather proofing. These practices mean
that buildings are sealed much tighter than in the past.
Proper combustion air supply for a power vented Type B installation requires ven-
tilation of the heated space. Natural infiltration of air may not be adequate. Use of
exhaust fans aggravates this situation. It is important to ensure that there is ad-
equate combustion air supply at all times. Reliance on doors and windows is not
allowed.
Always ensure that adequate combustion air is provided to suit the total
installation of all combustion equipment in accordance with BS6230 or
BS5440 as appropriate.
Ensure that the air combustion inlet opening at the rear side of the unit cannot be
obstructed (cfr. fig. 3).
WARNING:
When these air heaters are
installed in type B applica-
tions,designedtotakeairfor
combustionfromthespacein
which it is installed. Do not
restrict the combustion air
intake.

0502UDSAAMEN, Pag. 11/35
Figure 5 : Type C appliances : Combustion air and flue pipe sockets
C52
1) Flue pipe outlet collar
2) Combustion air pipe inlet collar
all mod. except. 035, 043 & 050 only mod. 035, 043, 050
C32 / C62
Combustion air inlet
pipe & flue pipe for
balanced flue
installation (type C
appliances)
Balanced flue air heaters are designed to be fitted with a combustion air inlet duct
that obtains outdoor air and a flue pipe that exhausts flue products to outdoors.
Both the flue and combustion air pipes must be sealed. Use gasket sealed seam-
lessaluminium or stainless steelpipe or equivalent. For testing, the flue pipe should
include a sealable test port.
The port must be at least 450 mm away from the air heater flue connection socket.
Follow the flue pipe manufacturers installation instructions for making joints, in-
cludingconnections to the air heater, for passing through a building element and for
support requirements.
Type C2 appliances must not be applied !
Figure 4 : Approved appliances type C
C12 C12b/C62

0502UDSAAMEN, Pag. 12/35
The presence of chlorine vapours in the combustion air of gas-fired heating equip-
ment presents a potential corrosion hazard. Chlorine, found usually in the form of
freon or degreaser compounds when exposed to a flame will precipitate from the
compound, and go into solution with any condensation that is present in the heat
exchanger or associated parts. The result is hydrochloric acid which readily at-
tacks all metals. Care should be taken to separate these vapours from the combus-
tion process. This may be done by wise location of the unit flue and combustion air
terminalswith regardto exhaustersor prevailingwind directions.Chlorine is heavier
than air. Keep this fact in mind when determining installation location of the heater
in relation to building exhaust systems.
Where chlorine vapours are prevalent heaters with special grade 316 A1SI stain-
less steel heat exchangers are recommended.
Hazards of Chlorine -
apply to the location
of the combustion air
inlet
8. Location heater
Remark:
Flue requirements may
affect location. Consult
section 7 before making
a final determination. WARNING:Iftouched,the ventpipeand internalheatersurfacesthat
are accessible from outside the heater will cause burns. Suspend the
heatersuch thatthese componentscannotbe touched.
Use the minimum clearances in section 5 and the throw data in the technical data
table of section 6 when determining where to suspend the heater.
Recommended minimum height is 2.5mm.
CAUTION : Do not locate the heater where it may be exposed to water.
For best results, the heater should be placed with certain rules in mind. Always
ensure that minimum clearances are maintained. Locating a unit heater above the
maximum recommended height can result in significant air stratification. When
possible, heaters should be arranged to blow toward or along exposed wall sur-
faces.
Suspended heaters are most effective when located as close to the working zone
as possible, but care should be exercised to avoid directing the discharged air di-
rectly on to room occupants.
Partitions, columns, counters, or other obstructions should be taken into consider-
ation when locating the unit heater so that a minimum quantity of airflow will be
deflected by such obstacles.
When units are located in the centre of the space to be heated, the air should be
discharged toward the exposed walls. In large areas, units should be located to
discharge air along exposed walls with extra units provided to discharge air in to-
ward the centre of the area. For optimum results heaters are best used in conjunc-
tion with recirculating air fans suspended at high level.
At those points where infiltration of cold air is excessive, such as at entrance doors
and shipping doors, it is desirable to locate the unit so that it will discharge directly
toward the source of cold air, typically from a distance of 4.5 to 6.0 meters or install
a downflow unit over the door opening.

0502UDSAAMEN, Pag. 13/35
9. Hanging
the heater
Warning : Do not place or add additional weight to the suspended heater.
Before suspending the heater, check the supporting structure to verify that it has
sufficient load-carrying capacity to support the weight of the unit.
WARNING:
Checkthesupporting
structureto verifythat it
hassufficientload-carrying
capacitytosupporttheunit
weight.Suspend theheater
onlyfromthethreadednut
retainersorwith a
manufacturerprovidedkit.
DONOT suspendfrom the
heatercabinet panels..
Be sure that the threaded hanger rods are locked to the heater as illustrated in
figure 6. Recommended maximum hanger rod length is 1.8m. Where longer drops
are required, ensure that restraints are fitted to prevent excess lateral movement
and supports are adequately sized.
Size 008 011 015 020 025 030 035 043 050 055 064 073 085 100
k
g
30 33 38 40 56 60 88 99 99 112 118 143 158 168
Leave the unit on the pallet. If the bottom of the unit is not supported or protected
damage can occur.
Figure 6 : Suspending the heater with rods from the threaded nut retainers
Add a nut to lock the M10x1.5
hanger rod to the heater
Table 6 : weights (kg)
The heater is supplied with four point suspension. All points must be used. Two
threaded nut retainers are provided on each side of the top of the heater. See figure
6 for hanger rod size.
Detail

0502UDSAAMEN, Pag. 14/35
Figure 7 :
Wall bracket kits (optional)
Types 008 - 030
When desired the heaters may be supported by wall brackets. Supporting in this
mannerallows theheaters to beplaced in close proximity tothe ceiling ormounted
directly to the vertical supporting structures of the building. There are 2 different
wall bracket designs for UDSAmodels as shown in the illustrations below.
Mounting instructions are detailed in the literature supplied with these optional
kits
Types 035 - 100

0502UDSAGBEN, Pag. 15/35
10. Gas Piping and
pressures
WARNING:All
componentsof agas supply
system must be leak tested
priortoplacingequipment
inservice. NEVERTEST
FORLEAKSWITHAN
OPENFLAME.Failure to
complycouldresultin
personalinjury,property
damageor death.
Warning : This appliance is equipped for a maximum gas supply pressure
of 50 mbar.
WARNING : Pressure testing supply piping
Test pressures above 50mbar : Disconnect the heater and manual valve from
the gas supply line which is to be tested. Cap or plug the supply line.
Test pressures below 50mbar : Before testing, close the manual valve on the
heater.
Diameter gas connection
Table 7 :
Type 008 011 015 020 025 030 035 043 050 055 064 073 085 100
Nat. Gas G20
Prop. G31 1/2 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4
All piping must be in accordance with requirements outlined in the National Gas
Codes (different for each country). Gas supply piping installation should also con-
formwith good practice and any local codes. Support gas piping with pipe hangers,
metal strapping, or other suitable material. Do not rely on the heater to support
the gas pipe.
Allsealing products shall be resistant tothe action of liquefied petroleum gasor any
other chemical constituents of the gas being supplied.
Install a ground joint union and manual shutoff the gas cock upstream of the unit
control system.
The unit is equipped with a nipple that extends outside the cabinet. The gas con-
nection is 1/2” or 3/4”, dependent on the size of the unit.
Leak test all connections by brushing on a leak detecting solution.
WARNING :WARNING :
WARNING :WARNING :
WARNING :
Do not oDo not o
Do not oDo not o
Do not ovv
vv
ver tightener tighten
er tightener tighten
er tighten
and do not rotate theand do not rotate the
and do not rotate theand do not rotate the
and do not rotate the
gas valve inside thegas valve inside the
gas valve inside thegas valve inside the
gas valve inside the
heater controlheater control
heater controlheater control
heater control
comparcompar
comparcompar
compartment.tment.
tment.tment.
tment.
Figure 8 : gas connection
0502UDSAAMEN, Pag. 15/35

0502UDSAAMEN, Pag. 16/35
11. Electrical
supply and
connections
The electrical installation may only be carried out by an appropriately qualified
person current to IEE Regulations. The supply line to the heater should include a
main switch. The minimum clearance distance between the contacts must be
more than 3 mm.
All electrical connections should be made in the heater control compartment
(refer to figure 9). Screw type terminals are provided. Connections should be in
accordance with the terminal markings and the wiring diagram affixed to the air
heater.
Attention :
Serious damage can occur to burner relay when faulty connection of
thermostat, reset switch or burner failure lamp.
Switching of wires for reset switch and flame failure (e.g. in a remote control
box) will destroy the burner relay.
The minimum external control required for the air heater is a room thermostat.
It is essential that the main input line and neutral to terminals L and N
remain live at all times even when the heater is switched off to ensure
correct operation of the unit.
A burner reset switch with red indicator light is fitted on the heater. To add a
remote reset button, make connections to the terminals in the electric box as
indicated on the wiring diagram.
IMPORTANT: If the reset button requires activating for any reason, the
cause must be determined. After determining and correcting the
problem, restart the heater and monitor long enough to ensure proper
operation (approx. 5 minutes).
An orange indicator light is fitted on the heater to signify when the burner is on.
DANGER :
THIS APPLIANCE
MUST BE
EARTHED.
Thermostat location Do not attempt to control more than 1 air heater from a single
thermostat or control panel unless a properly wired relay is fitted.
Follow the instructions supplied with such panels.
The location of the room thermostat or sensor is very important. It should not be
positioned on a cold wall or cold surface. Avoid location in draughty areas or
where it may be influenced by heat sources e.g. the sun, process plant, etc. The
thermostat should be mounted on a vibration free surface and mounted about 1,5
metres above floor level. Follow the thermostat manufacturers instructions. The
thermostat must be suitable for potential free contacts.
Ensure that all cables and installers wiring are fixed to the gas pipe and that they
do not touch the combustion collector box.

0502UDSAAMEN, Pag. 17/35
Figure 9 : Wiring connections on the terminal board
Legend:
Controls terminals
Heater terminals
5. Controls cables0,75mmfor
up to 200 metrerun.
Fuse rating must be sufficiently
sized to handle heater& motor
loadings.
Master/slave cable0,1mm,
bell wire type (no screen
necessary)
ATEM 1 Sensor cable
0,25mm (screened)
8.
6.
7.
Terminals shown may not be in
numerical order. Unusedterminals
may not be shown atall.
Retain/insert link wiresshownsolid
Remove link wiresshowndotted
1 Ph ase sup ply cable 2,5 mm
minimum.
Notes:
4.
3.
2.
1.
Thermistor Room
or Duct Sensor
Low
Voltage
240V
J' J1
1 phase
240V 50Hz
AS1
Mains Isolator-
Must be installedwithin
1 metre of the appliance
Room/Duct
thermostat
Time control
Slave / Master
Connections
(If Required)
240V
J' J1
240V
J1
Lock-out reset Lock-out lamp
(240V)
Fan only facilit
y
Power Supply
Other Controls (*)
External Controls
ATEM 1
(*) When an
AMBIRAD control
panel is not used.
Permanent
Mains Supply

0502UDSAAMEN, Pag. 18/35
12. Check
installation
&
start-up
Check the instal-
lation prior to
start-up
Heater start-up


Check suspension. Unit must be secure.Verify that no other parts are
fitted which are not individually supported and secured.


Check clearances from combustibles. Requirements are in section 5.


Checkventsystem tobe surethat it isinstalled accordingto theinstructions
in section 7, venting requirements.
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Check piping for leaks and proper gas line pressure. Bleed gas lines of
trapped air.
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Check electrical wiring and ensure that wiring conforms with the wiring
diagram. Be sure all wire sizes meet requirements.
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Check polarity. Verify that line voltage exists between the black “L1”
and earth ground.
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Verify that the appliance is earthed by conducting an earth continuity
test.
WARNING:
For your safety, follow the instructions exactly otherwise damage
or injury could occur.
•This heater does not have a pilot flame. It is equipped with an ignition
device which automatically lights the burner. Do not try to light the
burner by hand.
•Before operating, smell all around the heater area for gas. Be sure to
smell next to the floor because propane gas is heavier than air and will
settle near the floor.
•Do not use this appliance if any part has subjected to water ingress.
Immediately call a qualified service technician to inspect the appliance
and to replace any part of the control system and any gas control.
•When overheating occurs or when gas supply is not turned off, shut
the manual gas tap before turning off the electric power.

0502UDSAAMEN, Pag. 19/35
Operating instructions
and operating sequence
Check installation after
start-up
1. Set thermostat to the lowest setting.
2. Turn off all electric power to the heater.
3. Shut the gas cock at the inlet of the unit.
4. Wait five (5) minutes to clear out any gas. Then smell for gas, including
near the floor. If you smell gas, STOP! and follow the steps in the WARN-
INGS printed on page 3. If you do not smell gas, proceed to the next step.
5. Turn on the electric power to the heater.
6. Open the gas cock at the inlet of the unit.
7. If fitted, ensure that a time switch is set to an ‘ON’ period.
8. Adjust the thermostat to the required setting (must be above current room
temperature).
Note :
If the appliance does not operate, follow the instructions "To turn off gas
supply at theAppliance" printed below and call your service technician.
9. Thermostat calls for heat, energyzing the venter motor.
10. When adequate air flow for combustion is proven by an air proving switch
and a prepurge period has elapsed, the integral ignitor and multifunctional
gas control operate. The ignition spark ignites the gas creating the burner
flame.
11. Burner flame is sensed by a flame rod sensor and when the heat ex-
changer is warmed up (+/- 30 seconds) and the fan control relay closes,
the fan motor is energized.
12. If the flame is extinguished during the main burner operation, the inte-
grated control system closes the main valve and attempts to relight the
burner.Theunit will attempt 5 ignitions before entering a “lock out” mode.
Lock out is indicated by the red warning light on the heater. To end this
mode push on the reset switch.
13. To turn the heater ‘OFF’ for short periods : adjust the room thermostat to
its lowest setting or ‘OFF’. The fan will continue to run to cool the heater
and then switch off automatically.
14. To turn the heater ‘OFF’ for long periods : see ‘To turn off gas supply at
the appliance’below.
TO TURN OFF GAS SUPPLY AT THE APPLIANCE
1) Set thermostat to the lowest possible setting or ‘OFF’ position.
2) Shut off the gas tap when the fan has stopped.
3) Switch off electric power to the appliance.
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Check gas pressure as described in detail below.
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Turn the unit off and on, pausing 2 minutes between each cycle. Observe for
smoothignition.
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Set the thermostat to the required room temperature.
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Place this booklet and any control or optional information in an accessible
location near the heater or give this information to the end user.

0502UDSAAMEN, Pag. 20/35
Burner gas pressure
adjustment The gas pressure is set for the required heat input before the appliance leaves the
factory. Provided that the gas supply to the air heater is in accordance with the
supply pressure described on the appliance data plate, the operating pressure will
not require adjustment. To check the pressure use the following procedure:
* Ascertain from the heater’s data plate the correct operating gas pressure;
* Turn the room thermostat control to its lowest setting;
* Remove the screw from the burner pressure test point of the multi-functional
control valve. Connect a manometer to the test point( see figure 10a & 10b);
* Adjust the room thermostat to call for heat i.e. above room ambient tempera-
ture;
* Observe the burner gas pressure on the manometer and compare to the re-
quired pressure on the data plate;
* If necessary, adjust the burner gas pressure. Remove the cover screw (mod-
els 035 - 100) or cover cap (models 008 - 030). Turn the regulator screw anti-
clockwise to decrease pressure or clockwise to increase pressure (see figure
10a & 10b);
* Set room thermostat to lowest setting to turn OFF the burners. Replace the test
point screw/cap and with the main burner OFF, test for gas soundness using a
leak detector fluid.
Reset temperature control/room thermostat to comfort operating level.
Figure 10a : SIT gas valve (types 008-030)
Legend:
1) Shut-off solenoid valve EV1
2) Pressure regulator setting device, or, alternatively, outlet flow setting screw
3) Pilot gas flow restrictor
4) Step ignition flow adjustment screw
5) Inlet pressure test point
6) Outlet pressure test point
7) Shut-off solenoid valve EV2
8) Pilot outlet
9) Main gas outlet
10)Holes (M5) for fixing flanges
11)Connection for pressure regulator/combustion chamber compensation
3
5
11 17
46
2
8
10
9