Nortek Reznor UDSA-4 User manual

1607UDSA-4GBEN, Pag. 1/40
1607UDSA-4GBEN
UDSA-4
Gas fired Balanced flue / Fan assisted flue unit heater
INSTALLATION
COMMISSIONING
SERVICING
These appliances meet the following EC Directives:
DIR 2009/142/EC:GAD
DIR 2004/108/EC:EMC
DIR 2006/95/EC: LVD
DIR 2006/42/EC:MD
WARNING
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.
Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death. All
work must be carried out by appropriately qualified persons.
The manufacturer does not take any responsibility in the event of non-observance of the regulations concerning
the connection of the apparatus causing an evil operation possibly resulting in damage to the apparatus and/or
environment in which the unit is installed.

1607UDSA-4GBEN, Pag. 2/40
INDEX
Warnings ..........................................................................................................................3
1. General.......................................................................................................................4
2. Installation codes .......................................................................................................4
3. Warranty.....................................................................................................................4
4. Uncrating and preparation..........................................................................................4
5. Dimensions ................................................................................................................5
6. Technical data ............................................................................................................6
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 assembly..............................................................................................................28
19. Venter motor and wheel .............................................................................................29
20. Gas valve....................................................................................................................31
21. Combustion air pressure switch.................................................................................32
22. Limit controls.............................................................................................................32
23. Flue and combustion air system.................................................................................33
24. Troubleshooting .........................................................................................................33
25. Parts list......................................................................................................................38

1607UDSA-4GBEN, Pag. 3/40
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 instal-
lation, operation, and maintenance instructions thoroughly before install-
ing or servicing this equipment.
WARNING : Do not use this appliance if any part has been immersed in water.
Immediately call a qualified service technician to inspect the appliance and
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.
WARNING :This appliance is not intended for use by persons (including
children) with reduced sensory or mental capabilities or lack of experience and
knowledge, unless they have been given supervision or instruction concerning
use of the appliance by a person responsible for their safety. Children should
be supervised to ensure that they do not play with the appliance.

1607UDSA-4GBEN, Pag. 4/40
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 appropriate
plus all local building codes.
1. General Models UDSA-4 are design certified to the CE EN1020 standard for use in indus-
trial and commercial installations only. All models and sizes are available for use
with either natural or propane 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
the supplier before beginning installation.
The instructions in this manual apply only to the 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, docu-
ment the damage with the transport company and contact your supplier.
Checktheratingplateforthegasandelectricalspecifications ofthe 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 instructions
included in the option package.

1607UDSA-4GBEN, Pag. 5/40
5. Dimensions & Clearances (horizontal orientation = standard)
Top view
Front view
Legend:
1. Combustion air inlet
2. Flue connection
3. External gas connection
4. Electrical connections
5. Service panel
Rear view (all mod. except 035-4,043-4,050-4)
Side view
Rear view (only mod. 035-4,043-4,050-4)
Figure 1
Table 1 : Dimensions (mm)
UDSA-4 A B C D E F G H J K L M N P Q R
008-011 307 700 267 404 696 546 131 191 129 67 85 413 15,5 98 350 120
015-020 383 700 343 404 723 546 199,5 191 139 122 86 413 15,5 98 350 120
025-030 586 700 546 404 771 546 367,5 191 222 122 121 413 15,5 98 350 140
035-050 510 970 456 601 1033 897 371 194 126 158 121 622 33 149 600 140
055-064 663 970 609 601 1052 897 354 206 150 165 204 622 33 149 600 225
073 866 1040 812 651 1036 897 562 212 299 185 204 672 33 149 600 225
085 866 1040 812 651 1139 897 562 212 299 185 204 672 33 149 600 225
100 866 1040 812 651 1097 897 562 212 299 185 204 672 33 149 600 225

1607UDSA-4GBEN, Pag. 6/40
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 combustible
materials.
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
Table 2 : Clearances (mm)
Table 3 :
(*) : Heaters can be base mounted on suitable non combustible supports.
Model X Y Z (*) U V
008-4 →030-4 450 50 50 50 850
035-4 →100-4 450 100 100 100 850
UDSA-4 008 011 015 020 025 030 035 043 050 055 064 073 085 100
Dia flue/air
inlet (mm) 80 80 80 80 100 100 100 100 100 130 130 130 130 130
Dia gas
connection 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”

1607UDSA-4GBEN, Pag. 7/40
1) Gas Appliance Classifications for Approved Venting Methods based on CEN-report CR1749:2001.
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
pressure 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
Model 008-4 011-4 015-4 020-4 025-4 030-4 035-4
Combuson air and flue, type B instal. (1) B22
Combuson air and flue, type C instal. (1) C12, C32, C42,C52, C62, C82
Flue & combuson air connecon collars mm 80 80 80 80 100 100 100
Heat input (Hs) kW 8,8 13,2 17,6 22,0 30,8 35,2 41,8
Heat input (Hi) kW 7,9 11,9 15,9 19,8 27,8 31,7 37,7
Heat output kW 7,3 11,0 14,6 18,2 25,5 29,2 34,7
Thermal efficiency %92929292929292
Gas consumpon nat gas G20 m³/h 0,84 1,26 1,68 2,10 2,94 3,36 3,99
prop G31 kg/h 0,62 0,93 1,24 1,55 2,16 2,47 2,94
Gas connecon size (not supply line) (2) 1/2” 3/4”
Temperature rise K32323232323229
Air flow m³/h 680 1020 1360 1700 2385 2725 3510
Motor speed rpm 1390 1390 1450 1450 930 1250 920
Recommended mounng height(3) m3333444
Horizontal throw(4) m 8 10 13 16 20 25 25
Sound pressure (5) dB(A) 47 46 47 48 43 49 44
Electrical service (class IP20) 230/240V 1N ~ 50Hz
Total electrical rang W 121 121 126 126 273 270 290
Weight (net) kg 30 33 38 40 54 57 86
Model 043-4 050-4 055-4 064-4 073-4 085-4 100-4
Combuson air and flue, type B instal. (1) B22
Combuson air and flue, type C instal. (1) C12, C32, C42,C52, C62, C82
Flue & combuson air connecon collars mm 100 100 130 130 130 130 130
Heat input (Hs) kW 50,8 58,6 66,0 77,7 88,0 102,7 117,3
Heat input (Hi) kW 45,8 52,8 59,5 70,0 79,3 92,5 105,7
Heat output kW 42,1 48,6 54,7 64,4 73,0 85,1 97,0
Thermal efficiency %92929292929292
Gas consumpon nat gas G20 m³/h 4,85 5,59 6,30 7,41 8,39 9,79 11,18
prop G31 kg/h 3,57 4,12 4,64 5,46 6,18 7,21 8,24
Gas connecon size (not supply line) (2) 3/4”
Temperature rise K28282828282828
Air flow m³/h 4535 5180 5830 6810 7770 9065 10360
Motor speed rpm 910 1360 940 930 900 890 1050
Recommended mounng height(3) m4444444
Horizontal throw(4) m28323533414139
Sound pressure (5) dB(A) 45 56 51 52 54 55 60
Electrical service (class IP20) 230/240V 1N ~ 50Hz
Total electrical rang W 290 500 500 500 770 770 960
Weight (net) kg 99 102 114 118 143 160 179
6. Technical data
Table 4 : Technical data
Gas category : II2H3+

1607UDSA-4GBEN, Pag. 8/40
7. Flue
requirements
Model UDSA-4 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 operate safely
and efficiently with either a horizontal or vertical flue system when installed 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. A properly
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 regulations.
Failure to provide proper flueing could result in death, serious injury 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.
Table 5 : maximum flue system pipe lengths
• Use only one diameter of flue pipe on an installation.
• Recommended minimum flue is 1m.
Model UDSA 008-4 →020-4 025-4 →050-4 055-4 →100-4
Heater socket & pipe dia mm flue pipe 80 100 130
inlet pipe 80 100 130
Max. straight length (with wall/roof terminal) m flue pipe 9 9 9
inlet pipe 9 9 9
Equivalent length of 45° elbow m flue pipe 0.75 0.75 0.75
inlet pipe 0.75 0.75 0.75
Equivalent length of 90° elbow m flue pipe 1.5 1.5 1.5
inlet pipe 1.5 1.5 1.5

1607UDSA-4GBEN, Pag. 9/40
Flues for power
vented installations
(type B appliances)
Figure 2 : Approved appliances type B
B22 - roof
Flue outlet Venter outlet attachment 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.
WARNING :
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 ac-
cordance with BS6230/BS5440 plus other relevant regulations & rules in force.
Gasket sealed single wall flue seamless aluminium or stainless steel pipes are
required.All joints must be sealed to prevent products of combustion from leaking
into the building. If the flue passes through a combustible element of the building
it must be enclosed by a sleeve of non-combustible material and separated from
the sleeve by a 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 to avoid condensation. 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 flue must be constructed from non-corrodible material
not less than 20 mm diameter. Copper or copper based alloys must not be used
for condensation drains.
For testing, the flue pipe should include a sealable test port.
Ideally the test port should be at least 450mm away from the air heater flue connection
socket. However if a concentric flue fitting is attached directly to the connection sockets
then the combustion should be tested through the flue outlet collar via a drilled test port
which must be securely plugged on completion.
Follow the flue pipe manufacturers installation instructions for making joints, including
connections to the air heater, for passing through a building element and for support
requirements.

1607UDSA-4GBEN, Pag. 10/40
Figure 3 : Type B appliances : Combustion air and flue pipe sockets
1) Flue pipe outlet collar
2) Combustion air inlet opening
3) Protection grill (option) (02 25094)
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
insulation, 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 adequate
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 in-
stallation 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
applications, designed to
take air for combustion
from the space in which
it is installed. Do not re-
strict the combustion air
intake.
All mod. exc. 035-4, 043-4, 050-4 & 100-4 Only mod. 035-4, 043-4 & 050-4 Only mod. 100-4

1607UDSA-4GBEN, Pag. 11/40
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.
Type C2 appliances must not be applied !
Figure 4 : Approved appliances type C
C52
C32 / C62
C12 C12b/C62
Figure 5 : Type C appliances : Combustion air and flue pipe sockets
1) Flue pipe outlet collar
2) Combustion air pipe inlet collar
all mod. except. 035-4, 043-4 & 050-4 only mod. 035-4, 043-4, 050-4

1607UDSA-4GBEN, Pag. 12/40
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 attacks
all metals. Care should be taken to separate these vapours from the combustion
process. This may be done by wise location of the unit flue and combustion air ter-
minals with regard to exhausters or prevailing wind 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 316A1SI stainless
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: If touched, the vent pipe and internal heater surfaces
that are accessible from outside the heater will cause burns. Suspend
the heater such that these components cannot be 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 surfaces.
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 directly
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 dis-
charge air along exposed walls with extra units provided to discharge air in toward
the centre of the area. For optimum results heaters are best used in conjunction 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.

1607UDSA-4GBEN, Pag. 13/40
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:
Check the support-
ing structure to verify
that it has sufficient
load-carrying capac-
ity to support the unit
weight. Suspend the
heater only from the
threaded nut retainers
or with a manufac-
turer provided kit. DO
NOT suspend from the
heater cabinet 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.
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
Table 6 :
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.
UDSA-4 008 011 015 020 025 030 035
kg 30 33 38 40 54 57 86
UDSA-4 043 050 055 064 073 085 100
kg 99 102 114 118 143 160 179
Add a nut to lock the M10x1.5
hanger rod to the heater
Detail

1607UDSA-4GBEN, Pag. 14/40
Figure 7 :
Wall bracket kits (optional)
Types 008-4 -> 030-4
When desired the heaters may be supported by wall brackets. Supporting in this
manner allows the heaters to be placed in close proximity to the ceiling or mounted
directly to the vertical supporting structures of the building. There are 2 different
wall bracket designs for UDSA-4 models as shown in the illustrations below.
Mounting instructions are detailed in the literature supplied with these optional
kits
Types 035-4 -> 100-4

1607UDSA-4GBEN, Pag. 15/40
All piping must be in accordance with requirements outlined in the National Gas
Codes (different for each country). Gas supply piping installation should also
conform with 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.
All sealing products shall be resistant to the action of liquefied petroleum gas or
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 :
Do not over tighten
and do not rotate
the gas valve inside
the heater control
compartment.
Figure 8 : gas connection
10. Gas Piping
and
pressures
WARNING: All com-
ponents of a gas supply
system must be leak
tested prior to placing
equipment in service.
NEVER TEST FOR
LEAKS WITH AN
OPEN FLAME. Fail-
ure to comply could re-
sult in personal injury,
property damage or
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 :
Nat gas
Propane
Model 008-4 through 030-4
Model 035-4 through 100-4 1/2” 3/4”

1607UDSA-4GBEN, Pag. 16/40
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.
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.

1607UDSA-4GBEN, Pag. 17/40
WIRING DIAGRAM (for illustrative purposes)

1607UDSA-4GBEN, Pag. 18/40
12. Check
installation
&
start-up
Check the
installation prior
to start-up
Heater start-up
Checksuspension. Unit must be secure.Verifythatnootherpartsarefitted which
are not individually supported and secured.
Check clearances from combustibles. Requirements are in section 5.
Check vent system to be sure that it is installed according to the instructions in
section 7, venting requirements.
Check piping for leaks and proper gas line pressure. Bleed gas lines of trapped
air.
Check electrical wiring andensure that wiring conforms withthe wiring diagram.
Be sure all wire sizes meet requirements.
Check polarity. Verify that line voltage exists between the black “L1” and earth
ground.
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 occursor when gas supply isnot turned off, shut the manual
gas tap before turning off the electric power.

1607UDSA-4GBEN, Pag. 19/40
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 WARNINGS
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 the Appliance” 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 exchanger 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 integrated
control system closes the main valve and attempts to relight the burner. The
unit 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.
Check gas pressure as described in detail below.
Turn the unit off and on, pausing 2 minutes between each cycle. Observe for
smooth ignition.
Set the thermostat to the required room temperature.
Place this booklet and any control or optional information in an accessible
location near the heater or give this information to the end user.

1607UDSA-4GBEN, Pag. 20/40
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 temperature;
* Observe the burner gas pressure on the manometer and compare to the required
pressure on the data plate;
* If necessary, adjust the burner gas pressure. Remove the cover screw (models
035-2 - >100-2) or cover cap (models 008-2 -> 030-2). 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 9 : Honeywell gas valve (types 008-4 -> 043-4)
Legend:
1) Shut-off solenoid valve EV1
2) Pressure regulator setting device, or, alternatively, outlet flow setting screw
3) Inlet pressure test point
4) Outlet pressure test point
5) Shut-off solenoid valve EV2
6) Pilot outlet
7) Main gas outlet
8) Holes (M5) for fixing flanges
1
2
87
5
3
6
4