Gas fired room sealed unit heaters
TECHNICAL INFORMATION, ASSEMBLY
INSTRUCTIONS, USE AND MAINTENANCE
RS/UHA RS/UHA-2 RS/UHA-4
BENSON HEATING
LUDLOW ROAD
KNIGHTON
POWYS,
LD71LP U.K.
August 2003 Benson Heating is a Division of
Benson Climate Systems Ltd
2
COMPLIANCE NOTICES
The Benson RS/UHA range has been independently tested and assessed, and has been found to meet the
Essential Requirement of the following European Directives:
Gas appliance Directive (90/396/EEC)
Machinery Directive (89/392/EEC)
Low Voltage Directive (73/23/EEC and 93/68/EEC)
Electromagnetic Compatibility Directive (98/336/EEC and 91/31/EEC)
Product Liability Directive (65/374/EEC)
The manufacturer has taken reasonable and practical steps to ensure that Benson RS/UHA Range of Heaters are safe
and without risk when properly used. These heaters should therefore only be used i n the manner and pu rpose for which
they were intended, and in accordance with the recommendations detailed herewith.
The heaters have been designed, manufactured, assembled, inspected, and tested, with safety and quality in mind, there
are certain basic precautions which the installer and user should be a ware of, and they are strongly advised to read the
appropriate sections of the information pack accompanying the heater, prior to installation or use.
Benson Heating supports all new products being supplied to their customers with a comprehensive information pack; this
clearly defines mandatory instructions for the safe installation, use, and maintenance, of the appliance(s).
Where proprietary items are incorporated into Benson Heating pr oducts, detailed information and instructions are also
provided as part of the information pack.
It is the responsibility of the installer, owner, user, or hirer, of such products supplied by Benson Heating, to ensur e that
they are familiar with the appropriate information/manuals, supplied by the manufacturer, and that they are suitably
aware of the purpose of the manuals and the safety instructions. In addition, operators must be suitably trained in the use
of the appliance so as to ensure its continued safe and efficient use.
Benson Heating has a commitment to continuous improvement, and therefore reserves the right to amend or
change the specification of the RS/UHA Heater range subject to agreement from The Notified Body.
Contained within the text of the manual, the words 'Caution' and 'Warning' are used to highlight certain points.
Caution is used when failure to follow or implement the instruction(s) can lead to premature failure or dam age to the
heater or its component parts.
Warning is used when failure to heed or implement the instruction(s) can lead to not onl y component damage, but also
to a hazardous situation being created where there is a risk of personal injury.
PIN NUMBER
Notified Body PIN Reference is 0694BN3750
Type RS/UHA RS/UHA-2 RS/UHA-4
Single Stage Burner
Single Speed Fan
Two Stage Burner
Single Speed Fan
Two Stage Burner
Two Speed Fan
Single Stage Code Two Stage Code Dual Power Code
1
RS/UHA 50 3NAGBER016 RS/UHA 50-2 3NAGB2C016 RS/UHA 50-4 3NAGB21016
2
RS/UHA 80 3NAGBER026 RS/UHA 80-2 3NAGB2C026 RS/UHA 80-4 3NAGB21026
3
RS/UHA 105 3NAGBER036 RS/UHA 105-2 3NAGB2C036 RS/UHA 105-4 3NAGB21036
4
RS/UHA 140 3NAGBER046 RS/UHA 140-2 3NAGB2C046 RS/UHA 140-4 3NAGB21046
5
RS/UHA 200 3NAGBER066 RS/UHA 200-2 3NAGB2C066 RS/UHA 200-4 3NAGB21066
6
RS/UHA 260 3NAGBER086 RS/UHA 260-2 3NAGB2C086 RS/UHA 260-4 3NAGB21086
7
RS/UHA 325 3NAGBER106 RS/UHA 325-2 3NAGB2C106 RS/UHA 325-4 3NAGB21106
VERSION SINGLE STAGE
This heater has a single stage gas valve and a single speed axial fan .
VERSION TWO STAGE
This heater has a two stage Hi / Lo gas valve and a single speed axial fan.
VERSION DUAL POWER
This heater has a two stage Hi / Lo gas valve and a two speed axial fan .
GUARANTEE
The heater is supplied with a 2 year warranty on all parts.
In addition to this there is also a 10 year time related warranty on the combustion chamber.
The warranty commences from the date of despatch from the manufacturer, and is subject to the terms detailed within
the manufacturer 'conditions of business'.
The warranty may be invalidated if:
a) The w
arranty registration/commissioning card has not been completed and returned to the manufacturer
b) The installation is not in accordance with the general requirements of this manual
c) The flue arrangement and air supply for the heater are not in accordance with the manufacturers
recommendations, codes of practice, or similar standards
d) Air flow through the heater is not in accordance with the manufacturers technical specifications
e) Internal wiring on the heater has been tampered with or unauthorised service/repairs undertaken
f) The main electrical supply input to the heater has been interrupted during the heating mode
g) The heater has been subject to and affected by the ingress of water in any form
h) The heater is not operated at the rating(s) laid down in the manufacturers technical specifications
i) The heater has not been operated or used within the normal scope of its intended application
j) The manufacturer's recommended minimum service requirements have not been complied with
All warranty claims must contain the following information to enable processing to take place;
(1) Heater mode
l
(2) Heater serial number
(3) Order reference/date of order, together with full installation details (name and address)
(4) Details or symptoms of fault
(5) Installers name and address.
Faulty parts must be returned to the manufacturer Spares Department, the address of which is provided on the rear
cover of this manual. Any such parts will undergo inspection to verify the claim. Replacement parts su pplied prior to this
may be charged, and a credit supplied upon subsequent validation of the warranty claim. Consumable items are
specifically not included within the scope of the warranty.
Notification is required immediately a fault is suspected. T he manufacturer will not accept responsibilit y for any
additional damage that has been caused, expens e incurred, or consequential loss res ulting from any failure of
the heater(s).
Ensure that the heater is able to operate within the parameters shown on the data plate and the technical data
within the manual.
Incorrect gas settings may lead to condensation within the combustion if to low, and overheating if to high both
will cause damage to the heat exchanger.
Any reference made to Laws, Standards, Directives, Codes of Practice or other recommendations governing the
application and installation of heating appliances and which ma y be referred to in Br ochures, Specifications, Quotations,
and Installation, Operation and Maintenance manuals is do ne so for infor mation and guidance purposes onl y and shou ld
only be considered valid at the time of the publication. Manufacturer cannot be held responsi ble from any matters arising
from the revision to or introduction of new Laws, Standards, Directives, Codes of Practice or other recommendations.
3
4
INDEX
GENERAL
Description of equipment pag. 5
Identification “ 6
Description “ 7
Technical data “ 9
Wiring diagram “ 10
Remote control connections “ 14
Regulating the air flows “ 15
FOR THE USER
Operation “ 15
Servicing “ 15
Heater indicator lights “ 16
Receipt of product “ 16
Transport “ 16
Dimension “ 17
FOR THE INSTALLER
Installation “ 19
Wall bracket dimensions “ 19
Gas connection “ 22
Flue and combustion options “ 23
Electrical panel with circuit board “ 27
Electrical connection “ 27
TECHNICAL ASSISTANCE SERVICE
Pre commissioning checks “ 28
Initial start up RS/UHA “ 29
Initial start up RS/UHA-2 – RS/UHA-4 “ 30
Gas solenoid valves “ 31
Gas conversion “ 31
Thermostat “ 34
Checks “ 35
Maintenance “ 35
Fault finding “ 37
5
DESCRIPTION OF EQUIPMENT
Heat exchanger
Stainless steel construction easily accessible for
inspection and cleaning and maintenance operations.
Patented exchange elements made in stainless steel
modular sections with large surface area, trapezoidal in
section with swirl impressions for which give thermal
yields of over 90%. The exchange elements have no
welded joints or seams near to the burner flame so as to
avoid exposure of any weak points.
Flue outlet with integral flue venter to assist dispersal of
combustion gasses
External casing
Encloses all controls giving a good aesthetic appearance
and streamlined look whilst allowing for easy inspection.
The casing consists of removable panels also includes:
A burner compartment, which is totally sealed off, with an
inspection door;
Radiant heat insulation on the surfaces closest to the heat
exchanger;
Outlet grille for directing the warm air complete with
individually movable horizontal fins. vertical louvers are
available on request
Fan assembly
One, two or three axial high air flow single speed single
phase fan/motors complete with guards give effective
cooling of the combustion / heat exchanger.(single stage
and two stage ) and two speed fans (Dual Power).
The position of the fan(s) produce greater effective cooling
of the combustion chamber, optimising the heat exchange
and avoiding overheating.
Control and protection equipment
This is an electronic circuit board with ionisation flame
detection and ignition controls. The equipment controls and
monitors the operation of the burner in the following
sequence.
Checks the differential pressure switch operated by the flue
venter is in the closed position and the flue venter is
working;
Checks the air temperature of the combustion chamber
(below 100ºC)
Opens the gas solenoid valve;
Starts burner ignition;
Detects flame signal from flame probe and allows normal
heater operation
Failure in any of the above sequence will result in the
control box shutting the gas valve and stopping the heater
The Heater will go to lockout and can be only be reset
manually by pressing the red light on the front of the
equipment.
Gas solenoid valve
The mu
ltifunctional 1
stage gas valve (Single Stage) and 2
Stage gas valve (Two Stage and Dual Power)
Safety solenoid valve
A regulatory solenoid valve
A pressure regulator
A gas filter
Atmospheric multigas burner assembly
Consisting of:
Galvanized steel manifold
Visual monitoring aperture for the
electrodes and flame observation
1. 2 or 4 stainless steel burner bars
Ignition and Detection electrodes.
Note: the type 6 - 7 models are equipped with two gas
manifolds, each manifold has an ignition electrode.
Control and safety thermostats
The heater is controlled by three thermostats pre set to the
following:
LM Limit thermostat (100°C)
Capillary type. Manual Reset
Act as a safety device and shuts down the burner if the
heater goes to overheat. The yellow light will flash when in
overheat. The LIMIT thermostat is reset by the removal of
the plastic cap situated on the control panel inside the
heater, and manually pressing the reset button, after first
ensuring that the fault has been rectified. (calibrated at
100°C). Replaced cap after resetting thermostat.
TR Regulatory thermostat (0 – 90°C)
Capillary type. Automatic reset.
The thermostat monitors the temperature of the airflow and
will shut down the burner if the set level is exceeded
(calibrated at 70°C). Once the fan has sufficiently cooled the
heat exchanger, the burner will automatically relight. The
yellow indication light will flash until the burner relights. If
this fault persists the cause should be investigated.
SND Control probe (0 – 40°C)
Connected in series with the thermostat TR. The probe will
start the fan when the temperature reaches 30°C
(approximately 30 seconds from burner ignition). When the
desired room temperature is reached and the burner shuts
down, the probe will allow the fan to run for approximately
3-4 minutes until the heat exchanger has cooled sufficiently.
The probe also monitors the operation of the TR thermostat
and if a fault is detected will change the yellow flashing light
to a continuous on light. In addition to this the SND probe
monitors the temperature of the return air and will switch off
the fan prior to the 3-4 minute run on time if the heat
exchanger has cooled sufficiently (this avoiding cold air flow
from the heater).
Differential air pressure switch
This switch will shut the gas valve if the flue venter fails or
there is an obstruction in the flue.
Flue venter
This consists of a centrifugal fan which
Is run by an electric motor with self-cooling rotor the cooling
air is supplied through a duct pipe situated in the axial fan
air flow
Indication lights
These consist of three different coloured lights on the front
of the heater:
Green light – indicates normal working. Illuminates
when the gas solenoid valve opens
Yellow light – indicates the operation of the LM, TR
and SND thermostat.
Red light - to indicate lockout of the heater by the
control circuit failure.
Reset button to reset the lockout
Flue spigot
A flue spigot (100mm) is situated at the rear of the heater
for connection of flue pipes.
Combustion air spigot
A combustion air spigot (100/150mm) with a safety mesh of
less than 16 mm Ø on the rear of the heater allow for
connection of combustion air pipes.
IDENTIFICATION
If the technical data is lost or damaged ask
Benson Technical Dept. for a duplicate.
6
Check code and model is as data plate.
Position of data plate
Manufacturer
AIR HEATER
M odel
Serial Number
C PIN ountry
C C ategory ode
T Year ype
N kWominal heat INPUT
N kWominal heat OUTPUT
A mir Flow max
3
/h
E lectrical Supply
E Wlectrical power
P rotection rating
G AS TYPE
S upply pressure mbar
N ozzle pressure mbar
N ozzle diameter mm
G as consumption m3/h
APPLIANCE PRESET FOR G20 NATURALGAS
Packing label position
Code
Model
Serial No
DESCRIPTION
Types 1 - 5
1
2
4
14
11
12
13
10
3
9
8
7
6
5
15
16
31
32
15
30
27
28
29
26
25
22
21
23
24
17
18
19
20
NOTE:
Heaters t ype 1, 2, 3, 4, are equipped with one burner manifold
Heaters type 5 are equipped with two burner manifolds
Heaters type 1, 2, 3, 4, h a ve one axial fan only
Heaters type 5 have two axial fans
1. Thermostat TR
2. Limit Thermostat LM
3. Control probe SND
4. Flue venter inspection door
5. Flue gas section
6. Flue manifold
7. Air discharge plenum with horizontal louvres
8. Burner compartment
9. Burner clams
10. Burner plate insulation
11. Gas injector
12. Combustion chamber
13. Gas manifold
14. Burner bars
15. Flue venter cooling pipe
16. Deflector
17. Green Power on LED
18. Yellow high temperature indication LED
19. Red Lockout indication LED
20. Lockout reset
21. Electrical c onnection sockets
22. Gas connection
23. Combustion air spigot
24. Flue spigot
25. Axial fan
26. Gas valve
27. Spark Electrode
28. Flame probe
29. Inspection flap
30. Overheat reset LIMIT
31. Differential pre ssure switch connection tube
32. Flue venter
7
Type 6
- 7
30
32
31
17
29
33
34
13
15
10
11
14
16
1
8
1114
13
12
3
10
9
4
2
5
7
6
24
27
28
23
25
35
26
18
17
19
21
22
20
NOTE:
Heaters type 6 are supplied with two opposing burners
Heaters type 7 are supplied with four opposing burners
Heaters type 7 have three fans.
1. Control thermostat TR
2. Limit thermostat LM
3. Control probe SND
4. Flue inspection door
5. Flue gas section
6. Flue manifold
7. Air discharge plenum with horizontal louvres
8. Burner compartment
9. Burner clams
10. Burner plate in sulation
11. Gas injector
12. Combustion chamber
13. Gas manifold
14. Burner bars
15. Ignition transformer
16. Left hand burner compartment
17. Flue venter cooling pipe
18. Deflector
19. Green power on LED
20. Yellow high temperature indication LED
21. Red l ockout LED
22. Lockout reset
23. Electrical c onnection sockets
24. Gas connection
25. Combustion air spigot
26. Flue spigot
27. Axial fan
28. Gas pipe
29. Gas Valve (n°2 per type 6 & 7)
30. Spark electrode
31. Flame probe
32. Inspection flap
33. Overheat reset LIMIT
34. Differential pre ssure switch connection tube
35. Flue venter
8
9
TECHNICAL DATA
DESCRIPTION TYPE UNIT
1 2 3 4 5 6 7
HEAT OUTPUT 13,8 23,0 30,5 41,7 58,6 76,6 94,3 kW
47.000 78.500 104.000 142.000 200.000 261.500 322.000 Btu
HEAT INPUT 15.0 25.4 33.8 46.3 65.0 85.0 104.7 kW
(Nett) 52.000 86.000 115.000 158.000 224.000 290.000 357.000 Btu
EFFICIENCY 92,0 90,1 90,2 90,1 90,1 90,1 90,1 %
AIR FLOW +15°C 1250 1820 2920 4130 5900 7900 8750 Nm3/h
MAX AIR OFF (T)
32 37 31 30 30 29 32 °K
FAN SPEED Max 900 900 1350 1300 1350 1300 1350 rpm
SOUND LEVEL max @ 6m 39 44 53 55 54 56 59 Db(A)
MIN AIR OFF (T) ( Two Stage)
20 25 21 20 20 20 22 °K
MIN AIR OFF (T) ( Dual Power)
26 26 24 23 24 22 25 °K
8.7 15.8 21.0 28.8 40.5 52.9 65.2 kW HEAT INPUT (Min)
(Two Stage and Dual Power)
7480 13.558 18.060 24.768 34.830 45.494 56.072 kcal/h
FAN SPEED Min (Dual Power)
820 820 1200 1200 1200 1200 1200 rpm
SOUND LEVEL min @ 6m 37 41 51 53 52 54 57 Db(A)
Thermostat calibration
Thermostat TR (auto reset) 70 °C
Thermostat LM (manual reset) 100 °C
Thermostat SND (auto reset) 70 °C
Fan operation
Fan on 30 sec
Fan off 3 min’
Air pressure switch setting 0,90 0,85 0,90 0,85 1,95 0,40 0,70 m/Bar
Maximum flue resistance 40 70 70 70 70 160 115 Pa
Axial fan
Number 1 1 1 1 2 2 3 N°
Diameter 300 350 350 420 350 420 350 mm
Fan throw 10 14 18 26 32 35 37 m
Electrical supply
230 V - 50Hz 1ph
Electrical power 0,155 0,165 0,225 0,345 0,440 0,600 0,670 kW
Electrical protection 40 IP
Gas category II
2H3P
Installation types B22 – C12 – C32
Operational limits
Operating temperatures 0/+40 °C
Relative humidity (non condensing) 60 %
Natural Gas G20
Number of injectors 1 1 1 1 2 2 4 N°
Diameter of injectors 310 410 480 555 500 540 450 mm/100
Inlet pressure 20 m/Bar
Burner pressure (max) 12,0 13,0 13,0 13,0 10,0 13,0 10,5 m/Bar
Burner pressure (min) (Two Stage
Dual Power)
6.0 7.0 6.5 6.5 7.0 6.5 5.0 m/Bar
Consumption (max)
(1)
1,51 2,55 3,39 4,65 6,52 8,53 10,51 Nm3/h
Consumption (min) (Two Stage Dual
Power)
0.96 1.79 2.38 3.25 4.57 5.97 7.36 Nm
3
/h
Propane Gas G31
Number of injectors 1 1 1 1 2 2 4 N°
Diameter of injectors 190 250 280 335 285 320 255 mm/100
Inlet pressure 37 m/Bar
Burner pressure (max) 35,5 35,0 35,5 35,5 34,5 35,5 34,5 m/Bar
Burner pressure (min) (Two Stage
Dual Power)
17.0 18.0 18.5 18.0 18.0 18.0 18.5 m/Bar
Consumption (max)
(2)
0,58 0,98 1,30 1,78 2,50 3,27 4,03 Nm3/h
1,17 1,97 2,63 3,60 5,05 6,60 8,13 Kg/h
2.29 3.88 5.16 7.07 9.92 12.97 15.98 Ltrs/h
Consumption (min)
(2)
0.40 0.68 0.91 1.25 1.75 2.29 2.82 Nm3/h
0.75 1.38 1.84 2.52 3.53 4.62 5.69 Kg/h
1.46 2.72 3.62 4.94 6.04 9.08 11.19 Ltrs/h
(1) References:
Atmospheric pressure 1013 mBar
Gas temperature 15°C
(2) Atmospheric pressure 1013mBar
WIRING DIAGRAM SINGLE AND TWO STAGE
Type 1-2-3-4-5
C
FAN 1
C
FAN 2
IMT
J6
NL
F2
F1
N
J5
II°
I°
SF
230V 50Hz
EF
SE
J4
J8
IGN1
PA
COMCOM
NA NC
ION
EA1
J11
J17
J2
J14
VM
TA
J16 J13
J7
RSTR
MS
EVG1-I°
EVG1-II°
RST
LB
LL
LF
J10
J9 J12
SND
LM
TR
J15J18
J1
KEY
SND Temperature probe
TR Regulator y control thermostat (auto reset)
LM LIMIT thermostat (Manual reset)
EVG1-I° Gas solenoid valve 1
EVG1-II° Second stage gas valve 1 (Two Stage
version only)
C Fan capacitor
FAN 1 Axial fan 1
FAN 2 Axial fan 2 (t ype 5)
F1-F2 Line fuses
LF Green working light
LL High temperature indication light
LB Lockout indication
RST Lockout reset
EF Flue venter
PA Differential pressure switch
IGN1 Ignition transformer
EA1 Spark electrode
ION Ionisation probe
SE Electrical control board
IMT (*) Fused isolator
MS (*) Fire damper connection (accessory)
RSTR (*) Remote reset connection
TA (*) Room thermostat connection
VM (*) Fan switch connection
SF (*) Second stage gas valve connection
(*) External to the heater customer supply
10
Type 6-7
IGN2
EA2
EF
SE
J4
J8
IGN1
PA
COMCOM
NA NC
ION
EA1
J11
J17
J2
J14
VM
TA
J16 J13
J7
RSTR
MS
EVG2-I°
EVG1-I°
EVG2-II°
EVG1-II°
RST
LL
LB
LF
J10
J9 J12
SND
LM
TR
J15J18
J1
IMT
J6
230V ~ 50Hz
NL
F2
F1
N
J5
II°
I°
SF
C
FAN 1
C
FAN 2
FAN 3
C
KEY:
SND Temperature probe
TR Regulator y control thermostat (auto reset)
LM LIMIT thermostat (manual reset)
EVG1-I° Gas solenoid valve 1
EVG1-II° Second stage gas valve 1 (Two Stage
version only)
EVG2-I° Gas solenoid valve 2
EVG2-II° Second stage gas valve 2 (Two Stage
version only)
C Fan capacitor
FAN 1 Axial fan 1
FAN 2 Axial fan 2
FAN 3 Axial fan 3 (t ype 7)
F1-F2 Line fuse
LF Green working light
LL High temperature indication
LB Lockout indication
RST Lockout reset button
EF Flue venter
PA Differential pressure switch
IGN1 Ignition transformer 1
IGN2 Ignition transformer 2
EA1 Spark electrode 1
EA2 Spark electrode 2
ION Ionisation probe
SE Electrical control board
IMT (*) Fused isolator
MS (*) Fire damper connection (accessory)
RSTR (*) Remote reset connection
TA (*) Room Thermostat connections
VM (*) Fan switch connections
SF (*) Second stage gas valve connection
(*) External to the heater customer installation.
11
WIRING DIAGRAM DUAL POWER
Type 1-2-3-4-5
SE
RST
LB
J10
LL
LF
SND
EF PA
COMCOM
ION
J14
J16
J8
J4
NCNA
J17
J2
J11
J18J13
J15
RSTR
IGN1
EA1
J7
TA
VM
MS
CC
COMM
J9 J12
LOW
HIGH
LM
TR
EVG1-I°
FAN 1
EVG1-II°
J1
J6
IMT
F1
J5
F2
II°
SF
I°
230V 50Hz
LN
FAN 2
KEY
SND Temperature probe
TR Regulatory cont rol thermostat (auto reset)
LM LIMIT thermostat (Manual reset)
EVG1-I° Gas solenoid valve 1
EVG1-II° Second stage gas valve 1
C Fan capacitor
FAN 1 Axial fan 1
FAN 2 Axial fan 2 (type 5)
F1-F2 Line fuses
LF Green working light
LL High temperature indication
LB Lockout indication
RST Lockout reset button
EF Flue Venter
PA Differential pressure switch
IGN1 Ignition transformer
EA1 Spark electrode
ION Ionisation probe
SE Electrical board
IMT (*) Fused isolator
MS (*) Fire switch
RSTR (*) Remote reset
TA (*) Room thermostat
VM (*) Fan switch
SF (*) Second stage gas valve connection
(*) External to the heater customer installation
12
Type 6-7
IGN2
EA2
EF
SE
J4
J8
IGN1
PA
COMCOM
NA NC
ION
EA1
J11
J17
J2
J14
VM
TA
J16 J13
J7
RSTR
MS
EVG2-I°
EVG1-I°
EVG2-II°
EVG1-II°
RST
LL
LB
LF
J10
J9 J12
SND
LM
TR
J15J18
J1
IMT
J6
230V ~ 50Hz
NL
F2
F1
N
J5
II°
I°
SF
C
FAN 1
C
FAN 2
FAN 3
C
KEY:
SND Temperature probe
TR Regulatory control thermostat (auto
reset)
LM LIMIT thermostat (Manual reset)
EVG1-I° Gas solenoid valve 1
EVG1-II° Second stage gas valve 1
EVG2-I° Gas solenoid valve 2
EVG2-II° Second stage gas valve 2
C Capacitor
FAN 1 Axial Fan
FAN 2 Axial Fan
FAN 3 Axial Fan (only type 7)
F1-F2 Fuses
LF Green working light
LL High temperature indication
LB Lockout indication
RST Lockout reset button
EF Flue venter
PA Differential pressure switch
IGN1 Ignition transformer 1
IGN2 Ignition transformer 2
EA1 Spark electrode 1
EA2 Spark electrode 2
ION Ionisation probe
SE Electrical board
IMT (*) Fused isolator
MS (*) Fire switch
RSTR (*) Remote reset
TA (*) Room Thermostat
VM (*) Fan switch
SF (*) Second stage gas valve connection
(*) External to the heater customer installation.
13
REMOTE CONTROL CONNECTIONS
Connection to CP2A
Key:
B Blue M Mage
nta
BK Black O Orange
BN Brown P Purple
GR Grey R Red
G Green W White
K Pink Y Yellow
This wiring to be completed by the
installer
READ
THE INSTRUCTION MANUAL BEFORE
PROCEEDING WITH THE INSTALLATION.
14
THIS HEAT
ER IS NEUTRALLY SWITCHED
ENSURE THAT THE WIRING IS CORRECT TO
THE DIAGRAMS PROVIDED.
INCORRECT WIRING WILL DAMAGE THE
ELECTRICAL CONTROL PANEL
REGULATING THE AIR FLOW
The heater is supplied with horizontal louvres only
vertical louvres are available as an option and locate
inside the horizontal louvre plenum.
15
HORIZONT
AL
Ensure that the horizontal louvres are set so as to
evenly distribute the air in the area to be heated the y
should be opened at a minimum of 45 degrees
This will ensure that there is sufficient air flo w over the
chamber and will avoid nuisance overheat lockout
For this reason it is also important to ensure that the
vertical louvres if fitted are also open
OPERATION
45°
To switch ON the heater
Switch the fused isolator switch ON (supply
customer)
Switch the heater ON/OFF selector to “ON”
Turn the thermostat to the desired temperature
The heater will start automatically
To switch OFF the heater
Turn the thermostat to its lowest temperature
setting or alternatively switch the heater ON/OFF
selector switch to OFF
The burner will switch off but the fan will continue
to operate for 3 to 4 minutes to cool the
combustion chamber before stopping
Finally switch the fused isolator to OFF
To switch ON fan only
Switch the fused isolator to ON
Set ON/STANDBY switch to ON
Set VENT/HEAT switch to VENT position
The fan only will run
To switch OFF fan
Set ON/STANDBY switch to STANDBY
Stop
Turn the selector switch to STOP
IF HEATER IS TO BE SWITCHED OFF FOR A LONG
PERIOD
Set ON/STANDBY switch to STANDBY
Isolate at mains electrical supply
Isolate the gas supply
WARNING! UNLESS IN AN EMERGENCY
Never stop the heater by switching off at the
mains isolator. The residual heat accumulated
in the heat exchanger may trigger the LIMIT
safety device resulting in the need to reset
manually.
If this is repeated it will damage the heat
exchanger and will invalidate the warranty on
the heater
SERVICING
It is a requirement that only qualified personnel are
allowed to carry out installation commissioning or
servicing. In addition only spare parts recommended
by the manufacturer may be fitted, and the installer
should provide a list of recommended spare parts
that are available through the manufacturer or his
agent
Before commencing any maintenance or servicing
work the heater must be shut down and allowed to
cool, and have the gas and electric supplies to it
turned off at the supply cock and isolator
respectively.
Always test for gas soundness after completing any
service work particularly if this has necessitated the
removal and / or replacement of gas carrying
components
It is advisable that routine inspections are carried
out on a frequent basis, servicing must also be
carried out regularly, and in accordance with the
manufacturers recommendations i.e. at a maximum
interval of one year. In certain applications the
frequency of servicing will have to be increased,
this to a large extent is governed by the working
environment, and both the manufacturer and the
installer will be able to offer further advice.
It is advisable that routine inspections are carried
out on a frequent basis, servicing must also be
carried out regularly, and in accordance with the
manufacturers recommendations i.e. at a maximum
interval of one year. In certain applications the
frequency of servicing will have to be increased,
this to a large extent is governed by the working
environment, and both the manufacturer and the
installer will be able to offer further advice.
CLEAN EXTERNAL PANELS
This cleaning should only be carried out with damp
cloths with soap and water. If there are stubborn stains
dampen. The cloth with a 50% mixture of water and
white spirit
After cleaning dry the surfaces carefully
HEATER INDICATOR LIGHTS
16
If a fault should occur with the heater the lights situated
at the right hand side of the heater will be illuminated
indicating the fault
Red Lockout indication (1).
This will be illuminated if the heater has gone to
lockout due to the loss of flame sensing by the
flame probe situated in the burner assembly in order
to reset the heater the RESET Button (2) should be
pressed (if fitted with remote controls the remote
reset button will reset this switch).
Yellow overheat indication (3).
This will be illuminated if the heater has exceeded
the temperature set on the thermostat. The
thermostat will shut down the burner until the fan(s)
have cooled the chamber sufficiently and the burner
will re light.
If the yellow light is flashing this means that the
heater has gone to overheat and the LIMIT
thermostat has operated and shut down the burner
The heater will not re light until the LIMIT (4) has
been reset this can be done by removing the plastic
cap covering the reset button and pushing the reset
replace cap
The cause of the overheat should be investigated
RECEIPT OF PRODUCT
Delivery & pre installation checks
The heater is supplied wrapped in heavy dut y protective
polythene, mounted on a pallet.
On receipt of the heater, the following checks should
be carried out;
a) The model is as per order
b) That it is undamaged
c) That it is suitable for the gas supply and pressure
d) That it is suitable for the electrical supply
If any of these points are not satisfied then contact
should be made with the Sales Office at
manufacturer. In the case of claims for damage, this
must be reported in writing within 24 hours of
delivery, in order to comply with insurance
The instruction manual is an integral part of
the equipment and so, after the packaging
has been removed, make sure that it has
been collected and stored safety.
TRANSPORT
When moving
the heater ensure that the
equipment used is capable of lifting and
supporting the weight of the heater
When lifting by fork truck ensure that the forks
support the weight
DIMENSION
Heater types 1, 2, 3, 4, 5
Ø2
F
315
Ø
E
D
B
G
15
Ø1
15 530
15
C15
130
A
860
Type 1 2 3 4 5
A [mm]
610 665 745 925 1170
B [mm]
770 770 770 770 820
C [mm]
370 425 505 685 930
D [mm]
563 563 563 555 510
E [mm]
140 140 140 140 185
F [mm]
132 132 132 132 115
G [mm]
132 132 132 132 132
1 [mm]
100
(1)
100
(1)
100
(1)
100
(1)
100
(2)
2 [mm]
100
(1)
100
(1)
100
(1)
100
(1)
150
(2)
[bsp]
½ ½ ½ ½ ¾
Nett weight [kg]
65 67 73 92 138
(1) female
(2) male
17
Note: Heater type 5 has t
wo fans.
17
18
Ø100 male
132
185510
Ø
315
Ø150 male
115
820
130
A
860
225
C
15 530
225
15
Type 6 7
A [mm]
1720 1960
C [mm]
1270 1510
[bsp]
¾ ¾
Nett weight [kg]
171 205
Heater types 6, 7
NOT
E heaters t
ype 7 have three fans
18
INSTALLATION
Note
It is a requirement that only qualified and competent
personnel may undertake installation commissioning
and servicing of Heaters manufacturer.
19
WARNING
All of the basic criteria must be satisfied prior to
commencing installation and commissioning,
additionally, the Unit Heater must be positioned and
installed so as to comply with all the relevant stand ards
and guide lines as well as meeting national and local
fire regulations and insurance criteria, especially if it is
proposed that the heater is to be installed within a
special risk area (e.g. proximity to where petrol engined
vehicles are stored or parked, where cellulose spr aying
takes place, where woodworking machinery is
operated, etc,).
Indirect fired heaters must not be located in hazardous
areas. However, it is permissible for the heater to
supply air to such areas. The heater must not be
installed within an environment where there is a high
concentration of chlorides, fluorides, salts, or other
aggressive or volatile chemicals/compounds.
Nor should the heater be positioned where the burner
could be adversely affected by high winds or draughts.
The heater must be installed so that it is level. Supports
for the heater must be sufficiently robust to withstand
the weight of the heater and any ancillary equipment.
Any combustible material adjacent to the heater or flue
system must be so placed or shielded so that its
surface temperature does not exceed 65ºC
The location chosen for the heater must allow for
the fitting of an effective flue system.
The heater must be installed so that it is level, supports
for the heater must be sufficiently robust to withstand
the weight of the heater and any ancillary equipment
Any combustib
le material adjacent to the heater or flue
system must be so placed or shielded so that its
surface temperature does not exceed 65
o
C. Generally a
free blowing heater should be located at a height
(measured from floor level to the base of unit)
The location chosen for the air heater must allow for the
fitting of an effective flue system. It must also allow
adequate clearance for the air supply, return air
circulation, gas supply, electrical supply and also
provide good service access.
WARNING
SUSPENSION OF RSUHA HEATERS ARE
SUPPLIED WITH SUPPORT CHANNELS
(LOCATED INSIDE THE CONTROL PANEL
DOOR) IF THEY ARE TO BE SUSPENDED
HEATERS MUST NOT BE SUSPENDED BY
THE TOP PANEL OF THE HEATER
REMOVE THE KNOCKOUTS LOCATED IN THE
BASE PANEL (NEXT TO WALL BRACKET
FIXING SCREWS) INSERT 10MM DROP RODS
THROUGH THE TOP OF THE HEATER AND
SECURE TO THE CAPTIVE NUTS IN THE
SUPPORT CHANNELS PROVIDED.
WALL BRACKET DIMENSIONS (ACCESSORIES)
Type 1-2-3-4
Type 5-6-7
WARNING
The w
all brackets are designed to support one heater only it is the responsibility of the installer to ensure that all fixing
brackets are properly secure.
Diagram showing the installation limits for independent pipe horizontal flue options when using wall
support brackets:
Type 1-2-3-4 Type 5-6-7
Diagram showing the installation limits for horizontal concentric flue options when using wall support
brackets:
Ty
pe
1-2-3-4 Type 5-6-7
Type 1 2 3 4 5 6 7
C
370 425 505 685 530 1337 1577
20
Examples o
f positioning in small and medium spaces
Examples of positioning in large areas
Installation heights and minimum distances from walls and ceilings
21
2500-3000
500
700
2500-3000
700
500
700
GAS CONNECTION
Connection of the heater to the gas supply, whether Natural gas LPG, must be carried in compliance with the installation
laws and by qualified personnel. The warm air heater is set to work with (G20) Natural Gas.
A (G31) propane conversion kit is also available.
Before connecting up it is necessary to make sure that:
The correct type of gas is that for which the equipment has been set up is available.
The gas pipes are clean and free of debris.
The gas supply and meter are capable of delivering the required volume of gas to ensure the correct burner
pressure can be achieved. See TECHNICAL DATA.
The diameter of the pipework from the isolating cock to the burner must not be less than the diameter of the
connection into the multiblock.
An a
pproved gas jointing compound must be used on all joints and unions and the system purged and
tested for soundness prior to final connection
1. Threaded Gas pipe connector Male1/2” bsp
thread on the type 1 ÷ 4 heaters and 3/4” BSP on
the type 5 ÷ 7 heater
2. Pressure stabiliser
* (required to ensure the
correct pressure of combustible gas).
3. Filter
* (requir ed to prevent impurities which may
be present in the gas line from entering the
equipment and also to permit simple inspection
and maintenance).
4. Isolating Cock
* each heater supply must be
fitted with a separate isolating cock positioned
adjacent to and upstream of the union which
must be sited outside the heater.
5. Gas Pipe
(
*) Customer supply
WARNING!
When a LPG supply is used it is advisable to install a
first pressure reducer close to the liquid gas tank to
reduce the pressure to 1.5 bars and a second pressure
reducer near to the heater installation to bring the
pressure down from 1.5 bars to 40 mbar.
A third reducer (see position 2) mounted in proximity to
the equipment ensures the correct pressure is provided.
Note
Reference to The Institute of Gas Engineers
publications Utilisation Procedures IGE/UP1 and
IGE/UP2 together with reference to BS6891 is strongly
advised.
To prevent any problems which could arise due to a
loss of pressure it is advisable to install a minimum
pressure switch to shut down the heater in the event of
gas pressure failure.
22
WARNING
IMPORTANT NOTICE TO INSTALLERS
Installers should satisfy themselves that the gas pipew ork installation is carried out in accordance with all
current legislation, Codes of Practice and recommendations .
Additionally it may be necessary to protect the gas valves which form part of the heater or burner assembly
from potential pipe contamination particularly, but not exclusively , where copper gas pipework is used.
In instances where copper pipework is to be used for all or part of a gas pipework installation, including
short length final connections then we advise that installers consult with gas supplier or provider and
satisfy themselves what additional precautions may be necessary
23
FLUE AND COMBUSTION OPTIONS
Room sealed unit heaters are suitable for installation with the following flue configurations : B22 - C12 - C
32
.
Option B22
In this configuration the heater is connected to a single
flue pipe to discharge the products of combustion
outside the building either through the roof or throu gh a
wall
The combustion air is taken from inside the room
The flue pipe should be metal smooth bored pipe
with a diameter of not less than the flue spigot
connection on the heater
All joints should be sea le d
It must be properly secured so as to remain stable
at all times
It must have a wind shielded and rain proof terminal
The flue should not exceed the length limits
indicated in the following pages
There must be adequate ventilation in the room as
per current legislation.
Option C12
In this configuration the heater is connected by two
pipes, One discharging the products of combustion and
the other bringing the combustion air from outside the
building in which the heater is located
The outlet must be through the wall and may be m ade
with two separate pipes or with concentric pipes
The flue pipe and combustion air inlet should be
metal smooth bored pipe with a diameter of not less
that both the flue and combustion spigot
connections on the heater
All joints should be sea le d
It must be properly secured so as to remain stable
at all times
It must have a wind shielded and rain proof terminal
The flue should not exceed the length limits
indicated in the following pages
There must be adequate ventilation in the room as
per current legislation
Option C
32
In this configuration the heater is connected by two
pipes, One discharging the products of combustion and
the other bringing the combustion air from outside the
building in which the heater is located
The outlet must be through the roof and must be made
with concentric pipes
The flue pipe and combustion air inlet should be
metal smooth bored pipe with a diameter of not less
that both the flue and combustion spigot
connections on the heater
All joints should be sea le d
It must be properly secured so as to remain stable
at all times
It must have a wind shielded and rain proof terminal
The flue should not exceed the length limits
indicated in the following pages
The following pages show installation diagrams of the above configurations.
B22: Installation showing dimensions with flue terminal external to building and
internal combustion air
MAXIMUM FLUE LENGTHS:
FLUE EXIT HORIZONTAL FLUE EXIT VERTICAL
TYPE UNIT
L1 MIN. L1 MAX. L2 MIN. L2 MAX.
1
m 1,00 5,00 1,00 10,00
2
m 1,00 5,00 1,00 10,00
3
m 1,00 5,00 1,00 10,00
4
m 1,00 5,00 1,00 10,00
5
m 1,00 5,00 1,00 10,00
6
m 1,00 5,00 1,00 10,00
7
m 1,00 5,00 1,00 10,00
L2
Ø100
MIN. 400
L1
MAX 500
Ø100
MIN 400
Only flue components and accessories supplied by the manufacturer should be used on installation.
In installations where condensation in the flue pipes is likely to be a problem consideration should be made for the
fitting of drain to the flue installation .
Each bend corresponds to about 0,8-1 meters of straight pipework.
Provision should be made for adequate ventilation for combustion and ventilation purposes .
24
L1
Ø100
MAX 500
*
MIN. 400
C12:Installation showing both horizontal concentric flue discharge, and horizontal
independent pipe kit.
✴
100 mm type 1 – 2 – 3 – 4
150 mm type 5 – 6 – 7
MAX 320
L2
Ø100
*
MAXIMUM FLUE LENGTHS:
INDEPENDENT PIPE KIT HORIZONTAL CONCENTRIC FLUE
TYPE UNIT
L1 MIN. L1 MAX. L2 MIN. L2 MAX.
1
m 1,00 2,50 1,50 2,50
2
m 1,00 2,50 1,50 2,50
3
m 1,00 2,50 1,50 2,50
4
m 1,00 2,50 1,50 2,50
5
m 1,00 2,50 1,50 2,50
6
m 1,00 2,50 1,50 2,50
7
m 1,00 2,50 1,50 2,50
Only flue components and accessories supplied by the manufacturer should be used on installation.
In installations where condensation in the flue pipes is likely to be a problem consideration should be made for the
fitting of drain to the flue installation .
Each bend corresponds to about 0,8-1 meters of straight pipework.
Provision should be made for adequate ventilation .
25
26
to building
C32Installation showing vertical concentric flue terminal roof installation
combustion air external
Ø100
150
*
L1
✴
100 mm type 1 – 2 – 3 – 4
150 mm type 5 – 6 – 7
MAXIMUM FLUE LENGTH:
VERTICAL ROOF TERMINAL
TYPE UNIT
L1 MIN. L1 MAX.
1
m 0 10,00
2
m 0 10,00
3
m 0 10,00
4
m 0 10,00
5
m 0 10,00
6
m 0 10,00
7
m 0 10,00
Only flue components and accessories supplied by the manufacturer should be used on installation.
In installations where condensation in the flue pipes is likely to be a problem consi deration should be made for the
fitting of drain to the flue installation .
Each bend corresponds to about 0,8-1 meters of straight pipework.
Provision should be made for adequate ventilation.
ELECTRICAL PANEL WITH CIRCUIT BOARD
3
2
1
7
6
5
4
6
6
9
8
1. Lockout reset
2. Red lockout indication light
3. Yellow temperature indication light
4. Green operating light
5. Flame control circuit
6. Controls connection
7. Safety fuses
8. Control box cover
9. Pressure differential switch
ELECTRICAL CONNECTION
The heaters are supplied with the electric panel fitted
and pre wired Connection is required to
Claims for damage will not be considered if they have
resulted from incorrect wiring or the incorrect use of the
heater
Each heater requires a permanent 230V 50Hz 1ph
electrical supply, which must be wired through a Fuse d
Isolator fitted with a fuse of the correct rating
The mains elec trical supply
A room thermostat
Or accessories such as a remote control panel.
All electrical wiring and connections must be in
accordance with the relevant European, National,
and Local regulations as well as to IEE
Standards.
The correct supply connection points for the live, neutral ,
and earth are clearly indicated on the wiring diagram
mounted inside the wiring box cover.
Wiring diagrams are also detailed within this manual.
The electrical supply isolator should be mounted
adjacent to the air heater in an easily accessible position
to allow for servicing isolation, or emergency shut off.
Ensure that the Electric and gas supplies are
turned off before any electrical work is carried
out on the heater.
Ensure that the mains isolator is turned OFF
before undertaking any electrical on the heater.
Access to the electrical panel is gained by
opening the right hand heater side panel.
Also ens
ure that wiring cannot make contact
with any metal surfaces liable to be subject to
high temperatures, and where insulation of the
wiring could be impaired as a result of such
contact.
27
All the heaters must be earth
ed.
The main electrical supply must not be switched
off or disconnected as a method for stopping
the heater, the exception to this is in the event
of an emergency, or when the heater has been
allowed to cool sufficiently to prevent any
damage from being sustained to the heater or
its controls (ie: during servicing).
The cover to the electrical panel can be removed by
undoing the screws which secure it to the panel. A copy
of the wiring diagram is affixed to the inside of the cover.
Ensure th
at all connections are secure and that
there are no loose strands which could bridge
across the terminals.
One electrical pane
l per heater is required, unless
heaters are specified for multiple heater control
applications. On no account should more than one
heater be connected to a single time switch or
thermostat. The only exception to this is when a control
panel suitable for multiple heater applications is
supplied by the manufacturer, in which case the wiring
diagram supplied with the control panel should be rea d
in conjunction with the existing wiring diagram.
28
Any ancillary electrical items e.g. room
thermostats, time switches, remote panels etc,
must be wired into the heater electrical circuit in
accordance with the diagrams provided
When external controls operate to switch the
heater OFF, power to the heater should
remain to allow the fan to continue to operate
to sufficiently cool the heater thereby
preventing damage to the heat exchanger.
WARNING!
THESE HEATERS ARE NEUTRALLY
SWITCHED
ELECTRICAL TABLE
Type Electrical Electrical Ma
xi
mum Line Live Earth
Supply Power current Fuse (1) conductor (2) conductor (2)
(V-50Hz) (kW) (A) (A) (mm2) (mm2)
1
230V 50Hz
0,155 6 6,3 (5x20 mm) T 1,5 1,5
2
230V 50Hz
0,165 6 6,3 (5x20 mm) T 1,5 1,5
3
230V 50Hz
0,225 6 6,3 (5x20 mm) T 1,5 1,5
4
230V 50Hz
0,345 6 6,3 (5x20 mm) T 1,5 1,5
5
230V 50Hz
0,440 6 6,3 (5x20 mm) T 1,5 1,5
6
230V 50Hz
0,600 10 6,3 (5x20 mm) T 1,5 1,5
7
230V 50Hz
0,670 10 10 (5x20 mm) T 1,5 1,5
(1) Included with the heater
(2) The supply cables size should ensure a fall in voltage of less than 5% over a length of 30 meters
PRE COMMISSIONING CHECKS
The following pre-commissioning checks should be undertaken, having first ensured that the gas and electrical supplies
are turned off.
Check that all panels and fasteners are secure and in place.
Check that the heater is mo unted safely.
Check that the flue is sealed, secured, and adequately supported.
Check that the fan is free to rotate, that the fan is secured to its shaft, and that the guards and fan assembly are all in
place and properly secured
Check that the heater is installed so that it is not tilted and remains square.
Check that the outlet louvres are set to offer minimum resistance to air flow.
INITIAL START UP SINGLE STAGE
29
VENTILATION
Sw
itch on mains supply to the equipment
Set On/ Standby switch to ON
Set the remote control panel switch to VENT check that
fans rotation is correct
HEAT
Set the remote control pa
nel to HEAT
Set the room thermostat to the desired temperature
The flue venter will start, activating the differential
pressure switch
After a short period ignition takes place after one minute
the air flow fan will start
When desired room temperature is reached the burner
will stop the fan will overrun for approximately 3-4
minutes.
IGNITION
Con nect the m
anometer on the pressure test point
on the gas manifold
Set mains isolator to On
Open gas isola t or cock
Set the on/standby switch to ‘On’
Set heat/vent switch to Heat
Set the room thermostat to the desired temperature
Reset any lockout in the system as indicated by the
red or yellow lights
The flue venter will start up activating the differential
pressure switch.
The heater will pre purge the combustion chamber the
electronic control box will supply t he ignition electrode
and the gas valve simultaneously.
If the gas line has not been correctly purged ignition
may not take place at the first attempt resulting in
lockout of the burner.
Reset button and repeat.
Before each attempt at ignition it is
necessary to wait at least 10 seconds
When the burner has ignited check the manometer and,
adjust gas pressure setting to pressure indicated on data
plate, adjust by turning the solenoid valve screw on gas
valve.
Check the gas consumption reading corresponds
with that indicated in the TECHNICAL DATA section
Set on/standby switch to ‘standby’. When heater is
sufficiently cool Isolate electrical supply Isolate gas
supply
Remove the manometer and ensure the screw at the
test point is tightened to avoid any gas leaks
Open the gas isolating cock Switch on electrical
supply
Set the room thermostat to the desire temperature.
The heater is now ready for operation.
WARNING!
The heater must only be operated with the
burner compartment door(s) closed.
STOPPING
To stop the heater using only the room thermostat. Set it
to the minimum temperature. Fan will stop after about 34 minutes. If required, switch off the mains current at the
isolator.
WARNING
If Heater is to be switched off for a Long Period set
ON/STANDBY switch to STANDBY.
Isolate at mains electrical supply
Isolate the gas supply.
INITIAL START UP TWO STAGE AND DUAL POWER
30
VENTILATION
Sw
itch on mains supply to the equipment
Set On/ Standby switch to ON
Set the remote control panel switch to VENT check that
fans rotation is correct
HEAT
The heater ha
s a two stage gas valve and will operate
on high or low fire, the fan is single speed
Set the remote control panel to HEAT
Set the high and low room thermostats to the
desired temperatures
The high fire thermostat should be set at a temperature
approximately 3 degrees lower than the low fire
(control) thermostat setting,
The flue venter will start, activating the differential
pressure switch. After a short period ignition takes
place and after 30 seconds the air flow fan will start
The heater will initially start in high fire operation. When
the set temperature on the high fire thermostat is
reached the gas valve will turn down to low fire and the
heater will continue to operate in low fire until the
desired room (control) temperature is reached.
The burner will shut down and the fan will overrun for
approximately 3 minutes.
IGNITION
Connect the manometer on the pressure test point
on the gas manifold
Set mains isolator to On
Open gas isolator cock
Set the on/standby switch to ‘On’
Set heat/vent switch to Heat
Set the thermostats to the desired temperature’s
Reset any lockout in the system as indicated by the
red or yellow lights
The flue venter will start up activating the differential
pressure switch.
The heater will pre purge the combustion chamber the
electronic control box will supply t he ignition electrode
and the gas valve simultaneously.
If the gas line has not been correctly purged ignition
may not take place at the first attempt resulting in
lockout of the burner.
Reset button and repeat.
Before each attempt at ignition it is necessary to
wait at least 10 seconds
When the burner has ignited check the manometer and,
adjust gas pressure high low settings to the pressure’s
indicated on the data plate, and in the manual provided
adjust by turning the solenoid valve adjusters RP1 RP2
on gas valve.
Check the gas consumption reading corresponds
with that indicated in the TECHNICAL DATA section
Set on/standby switch to ‘standby’. When heater is
sufficiently cool Isolate electrical supply Isolate gas
supply
Remove the manometer and ensure the screw at the
test point is tightened to avoid any gas leaks
Open the gas isolating cock Switch on electrical
supply
Set the room (control) thermostat to the desire
temperature. The heater is now ready for operation.
WARNING!
The
he
a
ter must only be operated with the
burner compartment door(s) closed.
STOPPING
To stop the heater using only the room (control)
thermostat. Set it to the minimum temperature. Fan will
stop after approximately 3-4 minutes.
If required, switch off the mains current at the isolator.
WARNING
If He
ater is to be switched off for a Long Period set
ON/STANDBY switch to STANDBY.
Isolate at mains electrical supply
Isolate the gas supply.
GAS SOLENOID VALVES
Model SIT 840 (single stage)
31
Mo
del SIT 843 (two stage)
PM
Main i
n
let pressure test point
PV Head pressure test point
RP Pressure adjusting scre ws
RP1 Cross cut screw low fire adjuster
RP2 Hexagonal screw high fire adjuster
GAS CONVERSION
The heaters are supplied ready for use with (G20) Natural Gas set as per the tabl e below. Conversion kits are av ailable
from the manufacturer
Natural Gas H (G20)
TYPE 1 2 3 4 5 6 7
Number of injectors 1 1 1 1 2 2 4 N°
Diameter of injector 310 410 480 555 500 540 450 mm/100
Gas supply pressure 20 mBar
Head pressure high fire 12,0 13,0 13,0 13,0 10,0 13,0 10,5 mBar
Head pressure low fire (two stage–dual
power)
6,0 7,0 6,5 6,5 7,0 6,5 5,0 mBar
BEFORE CHANGING INJECTORS ENSURE GAS SUPPLY IS ISOLATED
To convert to Propane G31
1. Change injectors
2. Adjust the inlet gas pressure
3. Adjust the head pressure gas
4. Fit primary air diaphragm (if required)
5. Fit adhesive label indicating gas type
6. Ensure settings are correct as per manual.
CHAN
GE INJECTORS:
To change injectors
Unscrew the natural gas injectors and replace with the correct size injectors for propane as shown in the table bel ow:
Propane Gas (G31)
TYPE 1 2 3 4 5 6 7
Number of injectors 1 1 1 1 2 2 4 N°
Diameter of injectors 190 250 280 335 285 320 255 mm/100
Replacing injector in the manifold heater
(Type 1, 2, 3, 4, 6)
Replacing injectors 2per manifold for heater
(Type 5, 7)
Check that the size of the injector corresponds to
that on the data plate.
32
Check the siz
e of the nozzles and the pressure
correspond to that shown on the data plate
When the conversion is complete place the transfer
with the correct gas pressure on to the manifold as
supplied in the conversion kit.
Test for gas soundness on completion
Ensure new aluminium washers are fitted (type 5-
7).
GAS PRESS
URE SETTINGS
To regulate the gas inlet pressure:
Connect a manometer onto the gas valve test point (PM)
Adjust the inlet gas supply regulator (customer installation) to pressure indicated on data plate::
To regulate the head pressure:
Connect the manometer to the head pressure test point (PV)
Ensure the hea d pressure is correct to the tables provided
RS/UHA
33
RS/UHA-2 RS/UHA-4
Propa
ne ga
s (G31)
TYPE 1 2 3 4 5 6 7
Gas supply pressure 37 mBar
Head pressure max 35,5 35,0 35,5 35,5 34,5 35,5 34,5 mBar
Head pressure min (two stage -dual
power)
17,0 18,0 18,5 18,0 18,0 18,0 18,5 mBar
WAR
NING Inlet gas pressure must not exceed 60mbar at the gas valve inlet
SINGLE STAGE
Gas valve settings Propane G31
For operation on propane it will be necessary to exclude the pressure regulation of the gas valves by the method shown
Screw adjuster RP to the bottom:
TWO STAGE AND DUAL POWER
Gas valve regulation Propane G31:
Gas valve head pressure setting high fire Propane G31:
When setting the gas pressure for propane high fire
(second stage ) contact SF should be closed the high
fire pressure adjusting screw on the gas valve must b e
excluded.
Connect a manometer on test point PV
Remove the plastic cover from the adjuster RP1 RP2
With a screw driver hold the adjuster RP1 stationary
and using a spanner, screw adjuster RP2 clockwise to
the bottom of the thread until the correct pressure
according to the data plate is achieved.
Gas valve head pressure setting low fire Propane G31:
When setting the gas pressure for propane low fire
(first stage) contact SF should be open. The low fire
pressure should be adjusted to the settings shown on
the data plate and the data in the manual provided by
adjusting screw RP1.
Clockwise increases the pressure.
Anti clockwise to decrease the pressure.
On completion replace the plastic cover and seal with
paint.
Remove manometer ensuring that the test point screw
is gas tight.
On heaters
with 2 gas valves the above must be carried out on both valves.
Diaphrag
m assembly:
Diagram showing the fitting of a diaphragm plate
for the primary air single burner manifold
Diagram showing the fitting of a diaphragm plate
for the primary air for two burner manifolds
Heater types (1, 2, 3, 4, 6)
34
Heat
er ty
pes (5, 7)
WARNING the
diaphram plates should only be used when using propane gas G31 .
Gas conversion label:
Once a heater has been converted to Propane ensure t hat the correct label is fitted to the burner over top of the one
fitted in the factory covering it completely.
ATTENTION!
It is recommended that the diameter of the nozzles be
checked and that the pressure corresponds to that on
the data plate provided.
Ensure that all of the additional gas components are
correct for the installation (Including storage tank pipes
and pressure valves etc).
Ensure that the pressure regulators are re sealed after
carrying out the conversion
THERMOSTAT
The heater is supplied with thermostats to control the
FAN OPERATION AND LIMIT functions.
F AN OPERATION (SND)
When the air near the sensor SND reaches the set
temperature (30°C) which is approximately 30 seconds
after ignition the electrical contact closes and starts the
fan.
When the air temperature close to the sensor drops
below the set temperature (30°C) and about 3-4
minutes after the burner switches off the fan will stop.
This prevents cold air flows when the burner starts and
stops.
Fan control SND TR function is connected in
parallel through the control box to the fan operation
SND
F AN CONTROL THERMOSTAT (SND - TR)
If the air reaches the set temperature due to a fault in
the air circulation (SND – TR) thermostat (70°C), will
shut down the burner and the yellow light on the front of
the heater will illuminate. Once the heater has
sufficiently cooled down the thermostat will reset and
the light will go out
Continual operation should be investigated.
LIMIT THERMOSTAT (LM)
When due to a fault the air temperature near the sensor
exceeds the set value and reaches (100°C), the yello w
indicator light will flash and the burner will shut down
The overheat limit switch will have to be manually reset.
CHECKS
To ensure that the heater is working correctly certain
criteria need to be checked. Start up heater and check
the following
35
4
200
1
2
100
1
Check that the fan starts approximately 30 seconds
after ignition of the burner.
When the heater is at its full efficiency after about 20
minutes the following checks should be made
Check that the horizontal fins are correctly set so as to
give the optimum heating performance and the air flo w
is sufficient to cool the heat exchanger. Ensure where
vertical fins are installed they are also open and not
restricting the air flow.
Check that there are no gas leaks
Check that the gas rate is correct using a meter.
Check injector pressure is cor r ect.
Check temperature rise is correct to data plate.
Check the operation of the control and limit
thermostats TR, SND, LM.
Check that the room thermostat operates the burner
not the fan.
Check that the motor absorption is not more than
stated on data plate.
Check that the flue venter and axial fan are working
correctly.
Check that the fan runs on 3–4 minutes after the
burner has shut down.
Check output corresponds to that on the data plate.
Check that there is no condensate in the flue
gasses.
MAINTENANCE
WARNING!
It is a requirement that only qualified personnel are
allowed to carry out installation commissioning or
servicing.
Before commencing any maintenance or servicing work
the heater must be shut down and allowed to cool, and
have the gas and electric supplies to it turned off at the
supply cock and isolator respectively.
In order to carry out analyses of the Flue gasses
sample points must be made at the following
dimensions See Diagram.
COMBUSTION PRODUCT SAMPLING
1. Flue gas sampling point.
2. Combustion air sampling point.
CLEANING THE FLUE DISCHARGE AND AIR
INTAKE PIPES
The cleaning of the flue and air intake pipes consists of
the removal of any dust and debris inside the pipes.
CLEANING THE F AN
The cleaning of the fan assembly consists of clearing
any dust or debris from the fan blades, motor, and
protective guard.
FLUE VENTER CLEANING
The cleaning of the flue venter consists of the cleaning
of dust from the fan blades.
LIMIT THERMOSTAT
Check the limit thermostat operation once a year by
removing the TEST link and checking that the burner
has extinguished.
BURNER BAR CLEANING
The burner bar should be removed from its housing and
the tube(s) should be cleaned with a brass wire brush
and any dust or debris blown clear with a compressed
air gun. Any tubes gaskets or seals that are damage d
should be replaced.
AIR FLOW FINS
Ensure that the horizontal fins are set so as to evenly
distribute the air in the area to be heated they should
opened to a minimum of 45 degrees this will ensure that
there is sufficient air flow over the combustion chamber
and avoid nuisance over heat lockout .For this reason it
is also important to ensure that the vertical louvres if
fitted are also open and clean.
POSITIONING
OF IGNITION ELECTRODE AND IONISATION PROBE
It is important that the spark electrode and the ionisation probe are correctly positioned over the burner bars to ensure
good ignition and flame detection. The probe and electrode should 3- 4 mm from the burner bar.
CLEANING THE HEAT EXCHANGER
The heat exchanger should only be cleaned by suitably qualified personnel It is recommended that the heat
exchanger by cleaned once a year prior to the start of the heating season The following procedure should be
carried out:
3-4-5-6-7
Remove burner (1) from its housing after first having disconnected the gas solenoid valve;
Remove top panel (2);
Remove insp ection door (3);
Remove flue manifold (4);
Brush clean the heat exchanger elements (5);
With a vacuum remove any soot deposits from the elements (5);
Clean all heat exchanger external surfaces;
Re assemble i n reverse order ensuring that there is a good seal replacing any seals and gaskets as necessary.
36
37
FAULT FINDING
If heater is not working firstly check the following:
Check electrical supply
Check gas pressure
Check gas pressure is a stated in Technical Data
FAULT CAUSE SOLUTION
No operation
No electrical supply
Check main isolator.
Check supply cables.
Check line fuses.
Check electrical connections
No spark ignition.
Flue venter working
No indication lights on
Differential pressure switch not
working
Check flue pipe and combustion
air pipe are clear
Faulty differential pressure
switch
Replace differential pressure
switch
Poor connection at pressure
switch
Check air pipes
Check electrical connection
Check that the air pipes are
condensate free
Faulty flue venter
Change flue venter
Faulty control box
Change control box
Faulty ionization electrode
Check the electrode is not
cracked or damaged
Check the probe
No ignition
Flue venter not working
No indication lights on
Room thermostat open
Check room thermostat
Faulty flue venter
Change flue venter
Faulty control box
Change control box
Burner lights but cuts out
after 5 seconds
Phase and Neutral inverted
Check polarity of electrical
supply
Faulty ionization probe
Check electrical connection to
the probe.
Check probe
Change ionization probe.
Faulty ignition
Check that the gas type is
suitable for heater
Check gas pressure
Check head pressure.
Check gas supply pipes have
been purged of air.
Explosive start up
Faulty ignition electrode
Change ignition electrode
Incorrect electrode position
Reposition electrode correctly
over the burner bar
Faulty burner tube
Change burner tube
Faulty ignition transformer
Change transformer
38
Faulty ignition
Check that the gas type is
suitable for heater
Check gas pressure
Check head pressure.
Check gas supply pipes have
been purged of air.
Heat exchanger dirty
Check heat exchanger
Burner shuts down
No indication lights on
Pressure differential switch not
operating
Check air intake pipes are not
blocked .
Check flue pipes are not
blocked check operation of flue
venter
Faulty differential pressure
switch
Replace differential pressure
switch
Room thermostat in hot air flow
Check position of thermostat
The burner goes out due to
the intervention of the
thermostat SND; and is
restarted automatically when
heater has cooled down
Yellow light on.
Excessive heat exchanger
temperature
Check that the gas type is
suitable for heater
Check gas pressure
Check head pressure.
Check injector size is correct for
the heater
Excessive air temperature due
to poor air flow.
Check that the fan blades are
clean.
Check that the horizontal and
(vertical if fitted) louvres are
sufficiently open (see
installation).
Check fan is operating correctly
with sufficient air flow.
Faulty SND thermostat or faulty
fan control l
Change SND thermostat or fan
control l
The burner goes out due to
the intervention of the
thermostat TR. and is
restarted automatically when
heater has cooled down
Yellow light on.
Excessive heat exchanger
temperature
Check that the gas type is
suitable for heater
Check gas pressure
Check head pressure.
Check injector size is correct for
the heater
Excessive air temperature due
to poor air flow.
Check that the fan blades are
clean.
Check that the horizontal and
(vertical if fitted) louvres are
sufficiently open (see
installation).
Check fan is operating correctly
with sufficient air flow
Faulty thermostat
Change thermostat
Burner goes out due to the
intervention of the LIMIT
thermostat (LM).
Yellow light flashing
Excessive heat exchanger
temperature
Check that the gas type is
suitable for heater
Check gas pressure
Check head pressure.
Check injector size is correct for
the heater
Excessive air temperature due
to poor air flow.
Check that the fan blades are
clean.
39
Excessive air temperature due
to poor air flow
Check that the horizontal and
(vertical if fitted) louvres are
sufficiently open (see
installation).
Check fan is operating correctly
with sufficient air flow
Faulty Thermostat
Change thermostat
Faulty fan
Check fan capacitor
Check fan motor.
Fan faulty intervention of
thermal overload
Check electrical absorption
Replace fan motor.
Faulty FAN operation
Change fan control or SND
thermostat
Heater at lockout.
Red lamp illuminated
Faulty ignition
Check that the gas type is
suitable for heater
Check gas pressure
Check head pressure.
Check injector size is correct for
the heater
Ionisation probe faulty
Check electrical connection to
the probe.
Check probe
Change ionization probe.
Faulty ignition probe
Change ignition electrode
Faulty solenoid
Change solenoid
Dirty gas filter
Clean filter
Control box will not reset.
Red light illuminated
Faulty flame control module
Change control module check
electrical connections
Fan works intermittently
Faulty FAN operation
Change fan control or SND
thermostat
Insufficient gas pressure
Check that the gas type is
suitable for heater
Check gas pressure
Check head pressure.
Check injector size is correct for
the heater
The fan does not work
Faulty FAN operation
Change fan control or SND
thermostat
Faulty fan
Check fan operation
Check fan motor.
Heater works continuously
without reaching the required
temperature
Heater to small for application
Insufficient gas pressure
Re check heat output required
for application
Check that the gas type is
suitable for heater
Check gas pressure
Check head pressure.
Check injector size is correct for
the heater
Dirty heat exchanger
Clean heat exchanger
BENSON HEATING LUDLOW ROAD KNIGHTON POWYS LD7 ILP
Tel 01547 528534
Fax 01547 520399
www.bensonheating.com
Benson Heating is a Division of Benson Climate Systems Ltd
04/08/03 Rev. 2 Cod. 034-MN
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