Reznor UDSBD-4E Guide

1801UDSBD-4E,GBEN, Pag. 1/35
1801UDSBD-4E,--EN
UDSBD-4E
INSTALLATION - COMMISSIONING - SERVICING
These appliances meet the following EC Direcves
DIR 2009/142/EC:GAD
DIR 2014/30/EU:EMC
DIR 2014/35/EU: LVD
DIR 2006/42/EC:MD
Please read this document carefully before commencing installaon, commissioning and/or servicing.
Leave it with the user or aached to the appliance or gas service meter aer installaon.
WARNING
Improper installaon, adjustment, alteraon, service or maintenance can cause property damage, injury or death. All work
must be carried out by appropriately qualied persons.
The manufacturer does not take any responsibility in the event of non-observance of the regulaons concerning the
connecon of the apparatus causing a dangerous operaon possibly resulng in damage to the apparatus and/or environment
in which the unit is installed.
Subject to modicaons
GAS FIRED BALANCED FLUE / FAN ASSISTED FLUE
UNIT HEATER WITH CENTRIFUGAL FAN
Applies to
Belarus, Bulgaria, China, Czech Republic, Croatia, Cyprus, Denmark, Estonia, Finland, Greece, Hungary,
Iceland, Latvia, Lithuania, Montenegro, New Zealand, Norway, Poland, Portugal, Romania, Russian
Federation, Sebria, Slovakia, Slovenia, Spain, Sweden, Turkey, Ukraine

1801UDSBD-4E,--EN, Pag. 2/35
INDEX
Warnings 2
1. General 2
2. Installation codes 2
3. Warranty 2
4. Uncrating and preparation 2
5. Dimensions 3
6. Technical data 6
7. Flueing requirements 10
8. Unit heater location 13
9. Hanging the unit 14
10. Gas piping and pressures 14
11. Electrical supply and connections 15
12. Check installation and start up 17
13. Maintenance schedule 20
14. Heat exchanger maintenance 21
15. Burner maintenance 22
16. Burner orice 23
17. Ignition system 23
18. Blower motor 24
19. Centrifugal fan 24
20. Gas valve 25
21. Combustion air pressure switch 26
22. Flue and combustion air system 26
23.Limit controls 26
24. Troubleshooting 27
25. Parts list 33
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.
• Do not store or use petrol or other ammable
vapours and liquids in the vicinity of this or any
other appliance.
WARNINGS
Improper installation, adjustment, alteration, service, or
maintenance can cause property damage, injury, or death.
Read the installation, operation, and maintenance instruc-
tions thoroughly before installing or servicing this equip-
ment.
Do not use this appliance if any part has been immersed
in water. Immediately call a qualied service technician to
inspect the appliance and replace any gas control that hes
been immersed in water.
Gas-red appliances are not designed for use in hazourdous
atmospheres containing ammable vapors or combustible
dust, in atmospheres containing chlorinated or halogenated
hydrocarbons or in applications with airborne silicone substances.
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.
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.
These units must be installed in accordance with BS6230 or
BS5440 as appropriate plus all local building codes.
Models UDSBD-4E are design certied to the CE EN1020
standard for use in industrial 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 rat-
ing 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 correct 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 qualied installer in
accordance with these instructions. The installer is respon-
sible for the safe installation of the heater.
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 specications
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 op-
tions before the heater is suspended. Follow the instruc-
tions included in the option package.
1
GENERAL
2
INSTALLATION CODES
3
4
UNCRATING/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 be-
ing combustible.
c. A fan model is connected to a duct system or if the air
delivery system is modied.
WARRANTY

1801UDSBD-4E,--EN, Pag. 3/35
Top view
Front view
1. Combustion air inlet
2. Flue connection
3. External gas connection
4. Electrical connections
5. Service panel
Rear view
Side view
Figure 1a : UDSBD015-4E →UDSBD020-4E
Table 1a : Dimensions (mm)
J
G
K
H
R
12
43
P
MN
D
A C
U V
SCALE 1/4
E
A1
Y
Z
X
5
SCALE 1/4
UDSBD-4E A A1 B C D E F G H J K L M N P Q R
015 383 460 700 343 404 935 546 199,5 191 139 122 86 413 15,5 98 350 120
020 383 460 700 343 404 935 546 199,5 191 139 122 86 413 15,5 98 350 120
5
DIMENSIONS/CLEARANCES (horizontal orientation=standard)

1801UDSBD-4E,--EN, Pag. 4/35
Figure 1b : UDSBD025-4E, 030-4E, 035-4E, 043-4E, 050-4E, 055-4E & 064-4E
Top view
Front view
1. Combustion air inlet
2. Flue connection
3. External gas connection
4. Electrical connections
5. Service panel
Rear view mod. 025-4E & 030-4E
Side view
J
G
K
H
R
12
4 3
Rear view mod. 035-4E, 043-4E & 050-4E
J
K
H
G
R
1 2
34
THIS DRAWING AND THE CONTAINED INFORMATION ARE THE PROPERTY OF REZNOR EUROPE.
NO PARTS THEREOF MAY BE REPRODUCED OR USED WITHOUT THE WRITTEN CONSENT OF THE OWNER.
cut & punch tolerances : 0.3 mm
bend tolerances : 0.5 mm
doc. nr. : 03 00205/9805
M
Q
N
P
B
A C
CF
E
A1
L
J
K
H
G
R
OVERALL DIMENSIONS 62204 00
DESCRIPTION : PART NUMBER :
UDSBD 055 064 1 OF 2
A3
GROUP NAME:
SHEET : SIZE:
MASS (kg) :
1071253.009
DRAWN BY:
JPB
04.05.04
REV: XSCALE: 7/100 Checked :
TOLERANCE:
MATERIAL:
COMBUSTION AIR INLET
FLUE CONNECTION
EXTERNAL GAS CONNECTIONS
ELECTRIC CONNECTIONS
SERVICE PANEL
2
1
3
4
5
5
1 2
34
Rear view mod. 055-4E & 064-4E
Table 1b : Dimensions (mm)
P
MN
B
A C
U V
SCALE 7/50
E
A1
X
Y
z
SCALE 7/50
5
UDSBD-4E A A1 B C D E F G H J K L M N P Q R
025→030 586 590 700 546 404 1185 546 367,5 191 222 122 121 413 15,5 98 350 140
035→050 510 670 970 456 601 1610 897 371 194 126 165 121 623 33 148,5 600 140
055 663 685 970 609 601 1610 897 354 206 150 165 204 623 33 148,5 600 225
064 663 720 970 609 601 1610 897 354 206 150 165 204 623 33 148,5 600 225

1801UDSBD-4E,--EN, Pag. 5/35
UDSBD-4E X Y Z (*) U V
015 →030 100 130 50 270 850
035 →064 100 180 100 350 850
UDSBD-4E 015 020 025 030 035 043 050 055 064
Dia ue/air inlet (mm) 80 80 100 100 100 100 100 130 130
Dia gas connection 1/2” 1/2” 1/2” 1/2” 3/4” 3/4” 3/4” 3/4” 3/4”
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 ue system must be
minimum 150mm at all points !
Combustion air supply and ue system diameters
Diameter gas connection
Table 2 : Clearances (mm)
Table 3 :
(*) : Heaters can be base mounted on
suitable non combustible supports.
6
TECHNICAL DATA
Each blower motor is a three speed motor. The blower can be used on 3 different speeds. The units leaving the factory are
set to the standard speed as mentioned in table 4b. The curves as shown in the gures below, illlustrate for each unit which
speeds can be chosen in order to get another air duty. Speeds not illustrated in the curves mean that these are not applicable
(means : unit should not be set to that speed).
To use the blower on a different speed, the electrical connection of the blower motor needs to be changed. This has to be done
in the electrical connection box mounted on the blower itself. Inside the box, the 230V power supply wire is connected to the
terminal of the standard speed. For changing speeds, you have to reconnect this wire to the terminal that corresponds to the
desired speed (see wiring diagram inside service panel unit).
Country Gas category Country Gas Category
Belarus II2H3+ Montenegro II2H3+
Bulgaria I2H or I3B/P New Zealand II2H3+
China II2H3+ Norway II2H3 B/P
Czech Republic II2H3+ Poland II2H3P
Croatia II2H3P Portugal II2H3+
Cyprus II2H3+ Romania II2H3P
Denmark II2H3 B/P Russian Federation I2H or I3P
Estonia II2H3+ Serbia II2H3+
Finland II2H3 B/P Slovakia II2H3+
Greece II2H3+ Slovenia II2H3+
Hungary II2HS3P Spain II2H3+
Iceland II2H3+ Sweden II2H3 B/P
Latvia II2H3+ Turkey II2H3+
Lithuania II2H3+ Ukraine I2H or I3P
Table 4a : Gas category

1801UDSBD-4E,--EN, Pag. 6/35
Table 4b : Technical data
UDSBD-4E 015 020 025 030 035 043 050 055 064
Gas category see table 4a
Comb. Air & Flue, type B instal.1B22
Comb. Air & Flue, type C instal.1C12, C32, C42, C52, C62, C82
Flue & combustion air connection collars mm 80 80 100 100 100 100 100 130 130
Heat input (Hs) kW 17,6 22 30,8 35,2 42,2 50,8 58,6 66 77,7
Heat input (Hi) kW 15,9 19,8 27,8 31,7 38 45,8 52,8 59,5 70
Heat output kW 14,6 18,2 25,5 29,2 34,9 42,1 48,6 54,7 64,4
Thermal efciency % 92 92 92 92 92 92 92 92 92
Gas consumption rate
Nat. gas G20 m3/h 1,68 2,1 2,94 3,36 4,02 4,85 5,59 6,3 7,41
Prop. G31 kg/h 1,24 1,55 2,16 2,47 2,96 3,57 4,12 4,64 5,46
Gas connection size (not supply line size) 21/2” 3/4”
Temperature rise 3K 20 23 27 25 25 31 29 30 32
Airow 3m3/h 2150 2350 2750 3360 4080 3900 4900 5300 5930
Nominal motor speed rpm 950 950 1430 1430 950 950 950 950 950
Standard low, mid or high speed mid high low mid low low mid mid high
Recommanded mounting height 4m 3,5 4 4,5 4,5 5,5 5,5 6 6 6
Horizontal air throw 5m 18 23 26 26 32 34 38 38 38
Sound pressure 6dB(A) 50 52 47 51 46 47 52 50 53
Sound pressure 7dB(A) 57 58 54 58 53 54 59 57 60
Electrical service (protection class IP20) 230/240V 1N ~ 50 Hz
Total electrical rating W 496 496 1662 1662 1700 1700 1700 1700 1700
1) Gas Appliance Classications 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 diameter 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) Figure for discharge louvre zero deection.
4) Height from oor 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 airow, 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 signicant stratication may occur resulting in poor oor coverage and higher energy losses through the roof structure.
5) Isothermal conditions +/-20°C ambient air temperature, discharge louvres zero deection, v = 0,5m/s. The air throw will be inuenced by the height
of the building, mounting height of the unit, ambient temperature & adjustment of the louvres.
6) Sound pressure level in dB(A) in free eld conditions, measured at 5 meters from the unit, free outlet
7) Sound pressure level in dB(A), measured at 5 meters from the unit with A=160m² & Q=2, free outlet

1801UDSBD-4E,--EN, Pag. 7/35
Figure 2a : Blower curve for UDSBD015-4E→UDSBD/020-4E
Figure 2b : Blower curve for UDSBD025-4E→030-4E

1801UDSBD-4E,--EN, Pag. 8/35
Figure 2c : Blower curves for UDSBD035-4E
Figure 2d : Blower curves for UDSBD043-4E

1801UDSBD-4E,--EN, Pag. 9/35
Figure 2e : Blower curves for UDSBD050-4E
Figure 2f : Blower curves for UDSBD055-4E

1801UDSBD-4E,--EN, Pag. 10/35
Figure 2g : Blower curves for UDSBD064-4E
Model UDSBD-4E heaters may be installed as Type-B and
Type-C installations.
Local requirements may apply in addition to national
requirements. These unit heaters are designed to operate
safely and efciently with either a horizontal or vertical ue
system when installed with the specic requirements and
instructions.
If this heater is replacing an existing heater, be sure that
the ue is sized properly for the heater being installed and
that the existing ue is in good condition. A properly sized
ue system is required for safe operation of the heater. An
improperly sized ue system can cause unsafe conditions
and/or create condensation.
The air heaters may be installed as a balanced ue (type
C) heater requiring both a combustion air inlet duct and
a ue 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 ue pipe exhausting to
outdoors.
7
FLUE REQUIREMENTS
Each heater installed as a type B appliance must be tted with
an individual ue pipe and the combustion air inlet opening
is provided with a protection grill. Each heater installed as a
type C appliance must be tted with an individual combus-
tion air/ue pipe system. Type C2 appliance, with single duct
system for supply of combustion air and evacuation of ue
gasses, are not allowed.
IMPORTANT :
The ue must be installed in accordance with national
and local regulations. Failure to provide proper ueing
could result in death, serious injury and/or property
damage. The air heater must be installed with a ue to
the outside of the building. Safe operation of any power
vented gas apparatus requires a properly operating ue
system, correct provision for combustion air and regular
maintenance and inspection.
Diameter & maximum ue pipe lengths
Flue pipe diameters and maximum pipe lengths in table 5 ap-
ply to both horizontal and vertical systems. Add all straight
sections and equivalent lengths for elbow.
The total combined length must not exceed the maximum
ue length.

1801UDSBD-4E,--EN, Pag. 11/35
Table 5 : maximum ue system pipe lengths
FLUE OUTLET
• Use only one ue pipe diameter on an installation.
• Recommended minimum ue is 1m.
* Mentioned lenghts only apply when :
- no elbow installed immediately after ue and inlet
- successively installation of several elbows without straight pipe
Venter outlet attachment requirements:
Depending on the size of ue pipe as determined in table 5,
attach either the ue pipe directly to the collar or a taper-type
connector.
Attention :
Single wall ue 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 ow freely to
a point to which it can be released, i.e. a drain or gully. The
condensation drain from the ue 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.
The port must be at least 450 mm away from the air heater ue
connection socket. Follow the ue pipe manufacturers instal-
lation instructions for making joints, including connections to
the air heater, for passing through a building element and for
support requirements.
Single wall ue 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 ue
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 ue must not exceed 65°C when the heater is in
operation. The ue must be at least 150 mm away from any
combustible material.
FLUES FOR POWER VENTED INSTALLATIONS
(type B appliances)
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
accordance with BS6230/BS5440 plus other relevant regula-
tions & rules in force.
Figure 3 : Approved appliances type B
B22 - roof B22 - wall
015-020 025050 055064
mm Flue pipe/Inlet pipe 80 100 130
mFlue pipe/Inlet pipe 999
mFlue pipe/Inlet pipe 0,75 0,75 0,75
mFlue pipe/Inlet pipe 1,5 1,5 1,5
mFlue pipe/Inlet pipe 2,5 2,5 n.a
Equivalent Length of
90°elbow
UDSBD-4E
Heater socket & pipe dia
Max straight length
Equivalent length of 45°
elbow
Equivalent length of 90°
elbow

1801UDSBD-4E,--EN, Pag. 12/35
Figure 4 : Type B appliances :
Combustion air and ue pipe sockets
1) Flue pipe outlet collar
2) Combustion air inlet opening
THIS DRAWING AND THE CONTAINED INFORMATION ARE THE PROPERTY OF REZNOR EUROPE.
NO PARTS THEREOF MAY BE REPRODUCED OR USED WITHOUT THE WRITTEN CONSENT OF THE OWNER.
cut & punch tolerances : 0.3 mm
bend tolerances : 0.5 mm
doc. nr. : 03 00205/9805
62215 00
DESCRIPTION : PART NUMBER :
UDSBD 015 020 1 OF 3
A3
GROUP NAME:
SHEET : SIZE:
MASS (kg) :
0.000
DRAWN BY:
JPB
08.06.04
REV: XSCALE: 3/50 Checked :
TOLERANCE:
MATERIAL:
UDSBD 015 & 020
2
1
SCALE 1/5
THIS DRAWING AND THE CONTAINED INFORMATION ARE THE PROPERTY OF REZNOR EUROPE.
NO PARTS THEREOF MAY BE REPRODUCED OR USED WITHOUT THE WRITTEN CONSENT OF THE OWNER.
cut & punch tolerances : 0.3 mm
bend tolerances : 0.5 mm
doc. nr. : 03 00205/9805
62215 00
DESCRIPTION : PART NU MBER :
UDSBD 025 030 055 064 2 OF 3A3
GROUP NAM E:
SHEET : SIZE:
MASS (kg) :
0.000
DRAWN BY:
JPB
08.06.04
REV: XSCALE: 3/50 Check ed :
TOLERANCE:
MATERIAL:
1
2
UDSBD 025 030 055 064
SCALE 1/5
Models 025-4E, 030-4E, 055-4E & 064-4E
THIS DRAWING AND THE CONTAINED INFORMATION ARE THE PROPERTY OF REZNOR EUROPE.
NO PARTS THEREOF MAY BE REPRODUCED OR USED WITHOUT THE WRITTEN CONSENT OF THE OWNER.
cut & punch tolerances: 0.3 mm
bend tolerances : 0.5 mm
doc. nr. : 03 00205/9805
62215 00
DESCRIPTION : PART NUMBER :
UDSBD 035 043 050 3 OF 3
A3
GROUP NAME :
SHEET : SIZE:
MASS (kg) :
0.000
DRAWN BY:
JPB
08.06.04
REV: XSCALE: 3/50 Check ed :
TOLERANCE:
MATERIAL:
UDSBD 035 043 050
1
2
SCALE 1/5
Models 035-2, 043-2 & 050-2
Models 015-4E & 020-4E
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. g. 3).
Combustion air inlet pipe & ue pipe for balanced ue
installation (type C appliances)
Balanced ue air heaters are designed to be tted with a
combustion air inlet duct that obtains outdoor air and a ue
pipe that exhausts ue products to outdoors. Both the ue
and combustion air pipes must be sealed. Use gasket sealed
seamless aluminium or stainless steel pipe or equivalent.
For testing, the ue pipe should include a sealable test port.
Type C2 appliances must not be applied !
Figure 5 : Approved appliances type C
AIR SUPPLY
When these air heaters are installed in type B applica-
tions, designed to take air for combustion from the space
in which it is installed. Do not restrict the combustion
air intake.
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 proong. 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 ventilation of the heated space. Natural
inltration 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.
C12
C12b/C62
C32 / C62
C52

1801UDSBD-4E,--EN, Pag. 13/35
Figure 6 : Type C appliances : Combustion air and ue pipe sockets
1) Flue pipe outlet collar
2) Combustion air pipe inlet collar
THIS DRAWING AND THE CONTAINED INFORMATION ARE THE PROPERTY OF REZNOR EUROPE.
NO PARTS THEREOF MAY BE REPRODUCED OR USED WITHOUT THE WRITTEN CONSENT OF THE OWNER.
cut & punch tolerances : 0.3 mm
bend tolerances : 0.5 mm
doc. nr. : 03 00205/9805
62216 00
DESCRIPTION : PART NU MBER :
UDSBD 015 020 1 OF 3
A3
GROUP NAM E:
SHEET : SIZE:
MASS (kg) :
0.000
DRAWN BY:
JPB
08.06.04
REV: XSCALE: 7/100 Check ed :
TOLERANCE:
MATERIAL:
UDSBD 015 & 020
1
2
SCALE 1/5
015-4E & 020-4E
THIS DRAWING AND THE CONTAINED INFORMATION ARE THE PROPERTY OF REZNOR EUROPE.
NO PARTS THEREOF MAY BE REPRODUCED OR USED WITHOUT THE WRITTEN CONSENT OF THE OWNER.
cut & punch tolerances : 0.3 mm
bend tolerances : 0.5 mm
doc. nr. : 03 00205/9805
62216 00
DESCRIPTION : PART NUMBER :
UDSBD 025 030 055 064 2 OF 3A3
GROUP NAME :
SHEET : SIZE:
MASS (kg) :
0.000
DRAWN BY:
JPB
08.06.04
REV: XSCALE: 7/100 Check ed :
TOLERANCE:
MATERIAL:
UDSBD 025 030 055 064
2
1
SCALE 1/5
025-4E, 030-4E, 055-4E & 064-4E
THIS DRAWING AND THE CONTAINED INFORMATION ARE THE PROPERTY OF REZNOR EUROPE.
NO PARTS THEREOF MAY BE REPRODUCED OR USED WITHOUT THE WRITTEN CONSENT OF THE OWNER.
cut & punch tolerances: 0.3 mm
bend tolerances: 0.5 mm
62216 00
DESCRIPTION : PART NUMBER :
UDSBD 035 043 050 3 OF 3A3
GROUP NAME :
SHEET : SIZE:
MASS (kg) :
0.000
DRAWN BY:
JPB
08.06.04
REV: XSCALE: 3/50 Check ed :
TOLERANCE:
MATERIAL:
UDSBD 035 043 050
1
2
SCALE 17/100
035-4E, 043-4E & 050-4E
Remark:
Flue requirements may affect location. Consult section
7 before making a nal 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.
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 signicant air stratication. When possible,
heaters should be arranged to blow toward or along exposed
wall surfaces.
8
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 consideration when locating the unit heater so that a
minimum quantity of airow will be deected 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 toward the
centre of the area. For optimum results heaters are best used in
conjunction with recirculating air fans suspended at high level.
LOCATION HEATER
Caution : Do not locate the heater where it may be ex-
posed to water.
At those points where inltration 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 downow unit over the door opening.
The presence of chlorine vapours in the combustion air
of gas-red heating equipment presents a potential corro-
sion hazard. Chlorine, found usually in the form of freon or
degreaser compounds when exposed to a ame will precipi-
tate from the compound, and go into solution with any con-
densation 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 ue and combustion air terminals 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 316 A1SI stainless steel heat exchangers are recom-
mended.
Hazards of Chlorine - apply to the location of the
combustion air inlet

1801UDSBD-4E,--EN, Pag. 14/35
9
HANGING THE HEATER
Warning:
Check the supporting structure to verify that it has sufcient
load-carrying capacity to support the unit weight. Suspend
the heater only from the threaded nut retainers or with a
manufacturer provided kit. DO NOT suspend from the heat-
er cabinet panels.
Do not place or add additional weight to the suspended
heater.
Before suspending the heater, check the supporting structure to
verify that it has sufcient load-carrying capacity to support the
weight of the unit.
Leave the unit on the pallet. If the bottom of the unit is not
supported or protected damage can occur.
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 gure 6 for hanger rod size.
UDSBD-4E 015 020 025 030 035
kg 50 53 71 74 125
UDSBD-4E 043 050 055 064
kg 131 131 148 153
Figure 7 : Suspending the heater with rods from the
threaded nut retainers
Add a nut to lock the
M10x1.5 hanger rod to the
heater
Detail
Be sure that the threaded hanger rods are locked to the heater
as illustrated in gure 6. Recommended maximum hanger
rod length is 1.8m. Where longer drops are required, ensure
that restraints are tted to prevent excess lateral movement
and supports are adequately sized.
Table 6 : Weights
10
GAS PIPING & PRESSURES
All piping must be in accordance with requirements outlined in
the National Gas Codes (different for each country). Gas sup-
ply 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 liqueed
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 connection is 1/2” or 3/4”, dependent on the
size of the unit.
Leak test all connections by brushing on a leak detecting
solution.
Warnings:
All components of a gas supply system must be leak tested
prior to placing equipment in service. NEVER TEST FOR
LEAKS WITH AN OPEN FLAME. Failure to comply could
result in personal injury, property damage or death.
This appliance is equipped for a maximum gas supply
pressure of 50 mbar.
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.
Table 7 : Diameter gas connection
UDSBD-4E
Nat gas/
Propane
Model 015 through 030
Model 035 through 064
1/2”
3/4”
Figure 8 : gas connection

1801UDSBD-4E,--EN, Pag. 15/35
A polarisation switch with green indicator light is tted inside
the heater to check if Line, Neutral and Earth are connected
correctly. If this is the case, the green light will glow when
pushing on the switch. If the light does not glow, check
earth, line and neutral connections.
The electrical installation may only be carried out by an
appropriately qualied 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 afxed 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 ame 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.
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 tted. 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 inuenced 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 oor level. Follow the thermostat manufacturers
instructions. The thermostat must be suitable for potential
free contacts.
Ensure that all cables and installers wiring are xed to
the gas pipe and that they do not touch the combustion
collector box.
11
ELECTRICAL CONNECTION
MPORTANT:
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 tted on the heater to signify
when the burner is on.
A burner reset switch with red indicator light is tted on the
heater. To add a remote reset button, make connections to the
terminals in the electric box as indicated on the wiring diagram.
Check the installation prior to start-up
12
START-UP
 Check suspension. Unit must be secure.Verify that no other
parts are tted 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 and ensure that wiring conforms
with the 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.
Heater start-up
Warning:
For your safety, follow the instructions exactly other-
wise damage or injury could occur.
•This heater does not have a pilot ame. 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 oor because propane gas
is heavier than air and will settle near the oor.
• Do not use this appliance if any part has subjected
to water ingress. Immediately call a qualied 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.

1801UDSBD-4E,--EN, Pag. 16/35
Operating instructions and operating sequence
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 ve (5) minutes to clear out any gas. Then smell
for gas, including near the oor. 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 tted, 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).
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 ow for combustion is proven by an
air proving switch and a prepurge period has elapsed,
the integral ignitor and multifunctional gas control op-
erate. The ignition spark ignites the gas creating the
burner ame.
11. Burner ame is sensed by a ame 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 ame is extinguished during the main burner op-
eration, 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 informa-
tion in an accessible
location near the heater or give this information to the
end user.
Check installation after start-up
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 gures 9 & 10);
* 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 035-4E- >100-4E) or cover cap
(models 011-4E->030-4E). To adjust low re, use the lower
copper ring - to adjust high re, use the upper plastic ring;
* Set room thermostat to lowest setting to turn OFF the burn-
ers. Replace the test point screw/cap and with the main
burner OFF, test for gas soundness using a leak detector
uid.
Reset temperature control/room thermostat to comfort
operating level.

1801UDSBD-4E,--EN, Pag. 17/35
Figure 9 : Gas valve types 015-4E -> 043-4E Figure 10 : Gas valve types 050-4E -> 064-4E
Table 8 : Burner jets and pressures
2b
2a 1
5
3
48
7
6
1) Shut-off solenoid valve EV1
2a) Adjustment low re
2b) Adjustment high re
3) Inlet pressure test point (not visible on g. 10)
4) Outlet pressure test point (not visible on g. 10)
2a/2b
1
5
7
8
6
3
4
5) Shut-off solenoid valve EV2
6) Pilot outlet
7) Main gas outlet
8) Holes (M5) for xing anges
*Belarus, China, Croatia, Czech Republic, Cyprus, Estonia, Greece, Iceland, Latvia, Lithuania, Montenegro, New Zealand, Portugal,Serbia, Slovenia,
Slovakia,
*Romania, Poland
*Hungary, Russian Federation, Ukraine
*Bulgaria, Denmark, Finland, Norway, Sweden
015-2 020-2 025-2 030-2 035-2 043-2 050-2 055-2 064-2
Nat.Gas
(G20)
Burner jet dia 3,70 4,20 4,80 5,30 5,75 6,50 6,80 7,10 8,00
Burner
pressure mbar 7,80 7,10 8,20 7,50 7,90 7,10 7,90 8,40 7,90 inlet pressure
20 mbar
Prop.
(G31)
Burner jet dia 1,19 2,15 2,60 2,80 3,10 3,35 3,70 3,90 4,15
Burner
pressure mbar 36,90 36,90 36,80 36,80 36,00 35,90 35,80 35,70 35,60 inlet pressure
37 mbar
015-2 020-2 025-2 030-2 035-2 043-2 050-2 055-2 064-2
Nat.Gas
(G20)
Burner jet dia 3,70 4,20 4,80 5,30 5,75 6,50 6,80 7,10 8,00
Burner
pressure mbar 7,80 7,10 8,20 7,50 7,90 7,10 7,90 8,40 7,90 inlet pressure
20 mbar
Prop.
(G31)
Burner jet dia 2,10 2,25 2,80 2,95 3,30 3,50 3,80 4,10 4,40
Burner
pressure mbar 29,90 29,90 29,80 29,80 28,90 29,30 28,80 28,40 28,50 inlet pressure
30 mbar
015-2 020-2 025-2 030-2 035-2 043-2 050-2 055-2 064-2
Nat.Gas
(G20)
Burner jet dia 3,70 4,20 4,80 5,30 5,75 6,50 6,80 7,10 8,00
Burner
pressure mbar 7,80 7,10 8,20 7,50 7,90 7,10 7,90 8,40 7,90 inlet pressure
25 mbar
Prop.
(G31)
Burner jet dia 1,19 2,15 2,60 2,80 3,10 3,35 3,70 3,90 4,15
Burner
pressure mbar 36,90 36,90 36,80 36,80 36,00 35,90 35,80 35,70 35,60 inlet pressure
50 mbar
015-2 020-2 025-2 030-2 035-2 043-2 050-2 055-2 064-2
Nat.Gas
(G20)
Burner jet dia 3,70 4,20 4,80 5,30 5,75 6,50 6,80 7,10 8,00
Burner
pressure mbar 7,80 7,10 8,20 7,50 7,90 7,10 7,90 8,40 7,90 inlet pressure
20 mbar
Prop.
(G31)
Burner jet dia 1,19 2,15 2,60 2,80 3,10 3,35 3,70 3,90 4,15
Burner
pressure mbar 28,90 28,90 28,80 28,80 29,20 29,20 29,00 28,90 28,90 inlet pressure
30 mbar

1801UDSBD-4E,--EN, Pag. 18/35
Denitions
Start position: The system is not in lock-out position and can proceed with the start-up sequence upon a demand for heat.
Pre-purge time: This is a period of 20 seconds during which the combustion fan (venter) operates prior to activation of the ignition device.
Safety time: The safety time is the delay between the gas valve being energised and the ame sensor checking for the presence of a
ame. This is a period of 5 seconds.
Note: If no ame is sensed, the burner relay will attempt ignition 5 times before going into lock-out mode.
Post-purge time: This is the time of 10 seconds between burner shut-down and the moment the combustion fan (venter) is de-energized.
This heater is equipped with a direct spark integrated control relay. The control relay monitors the safety devices and
controls the operation of the venter motor and the gas valve between heat cycles. The time line below illustrates a nor-
mal heat cycle.
IGNITION SYSTEM
Normal heat cycle operating sequence

1801UDSBD-4E,--EN, Pag. 19/35
NOTE: If replacement parts are required, use only
factory-authorized parts.
Figure 11a : Location of controls
The material contained in the MAINTENANCE AND SERVICE
Section of this manual is designed to aid a qualied service
technician in maintaining and servicing this equipment. This
heater will operate with a minimum of maintenance.
To ensure long life and satisfactory performance, a heater that
is operated under normal conditions should be in-
Warning : If you turn off the power supply, always turn off
the gas.
Maintenance Schedule - The following procedures should be
carried out at least once each year (See gure 11a) :
• Clean all dirt, lint, and grease from the fan blade, fan guard,
and motor.
• Check the heat exchanger both internally and externally for
evidence of physical damage.
• Check the burner for scale, dust, or lint accumulation. Clean
if required.
1) Burner
2) LC3 limit control
3) Burner operating led
4) Reset switch (S5)+burner
lockout
5) Spark ignitor (ER)
6) Control panel
13
MAINTENANCE/SERVICE
spected and cleaned at the start of each heating season
(inspection and maintenance at least once a year). If the
heater is operating in an area where an unusual amount of
dust or other impurities are present in the air, more frequent
maintenance is recommended.
When any service is completed, be careful to reassemble
correctly to ensure that no unsafe conditions are created.
When starting the heater, always follow the lighting instruc-
tions on the heater.
• Check the vent or vent/combustion air system for sound-
ness. Replace any parts that do not appear sound.
• Check the wiring for any damage. Replace damaged
wiring.
3
8
1
4
2
5
6
7
9
10
11
7) Main gas valve (V1)
8) Venter motor.
9 Limit control LC1
10) Flame sensor (IS)
11) Modulating gas valve (VM)

1801UDSBD-4E,--EN, Pag. 20/35
Figure 11b - Control panel assy located
on a removable bracket
1) Control relay (ER)
2) Terminal blocks
3) Pressure switch (S3)
4) Electronic burner relay fuse 3.15AF
This heater is equipped with a patented T-CORE2® heat exchanger.
Remove any external dirt or dust accumulation. Visually check the heat exchanger for cracks and holes. If a crack or hole is
observed, replace the heat exchanger.
14
HEAT EXCHANGER MAINTENANCE
1
2
3
4