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Gas fired room sealed unit heaters TECHNICAL INFORMATION, ASSEMBLY INSTRUCTIONS, USE AND MAINTENANCE RS/UHC BENSON HEATING LUDLOW ROAD KNIGHTON POWYS, LD71LP U.K. October 2002 Benson Heating is a Division of Benson Climate Systems Ltd...
It is the responsibility of the installer, owner, user, or hirer, of such products supplied by Benson Heating, to ensure 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.
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 dispatch from the manufacturer, and is subject to the terms detailed within the manufacturer 'conditions of business'.
INDEX GENERAL Compliance notices page. Range “ Guarantee " Description Equipment “ Identification “ Description “ Technical data “ Wiring diagram “ Remote control connections “ FOR THE USER Setting up “ Servicing “ Heater indicator lights “ FOR THE INSTALLER Reciept of product and transport “...
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DESCRIPTION OF EQUIPMENT Heat exchanger Control and safety thermostat • The heater is controlled by three thermostats pre set to the Stainless steel construction easily accessible for following: inspection and cleaning and maintenance operations. • Patented exchange elements made in stainless steel LM Limit thermostat (100°C) modular sections with large surface area, trapezoidal Capillary type.
IDENTIFICATION If the technical data is lost or damaged ask Benson Technical Dept. for a duplicate. Manufacturer AIR HEATER Model Serial Number Country Category Code Type Year Nominal heat INPUT Nominal heat OUTPUT Air Flow (+15°C) Electrical Supply Electrical power...
DESCRIPTION Type 1÷4 NOTE: • Heaters type 1, 2, 3 have a single burner manifold. • heaters type 4 have two burner manifolds Regulation thermostat SND 19. Red light/button lockout reset FAN thermostat TR 20. Lockout reset LIMIT thermostat LM 21.
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Type 5÷6 NOTE: • Heaters type 5 are supplied with 2 opposing burner manifolds • heaters type 6 are supplied with 4 opposing burner manifolds Regulation thermostat 21. Yellow limit indication light LIMIT thermostat 22. Red light/button lockout reset FAN thermostat 23.
WIRING DIAGRAM Type 1-2-3-4 ELECTRICAL SUPPLY SINGLE PHASE 230V 50Hz RSTR IGN1 Temperature control probe TA (*) Room thermostat Regulatory control thermostat (auto reset) VM (*) Fan switch LIMIT thermostsat (Manual reset) EVG1-I° Gas solenoid valve Flue Venter Capicator Differential pressure switch Centrifugal Fan IGN1 Ignition transformer...
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Type 5-6 RSTR IGN1 IGN2 ELECTRICAL SUPPLY THREE-PHASE 400V 50Hz 3N KEY: Temperature control probe IGN1 Ignition transformer 1 Regulatory control termostat IGN2 Ignition transformer 2 LIMIT Termostat (Manaual reset) Spark electrode 1 EVG1-I° Gas valve 1 Spark electrode 2 EVG2-I°...
REMOTE CONTROL CONNECTIONS Connection to CP2A Key: Blue M Magenta BK Black O Orange BN Brown P Purple GR Grey R Red Green W White Pink Y Yellow This wiring to be completed by the installer Connection to CP4A READ THE INSTRUCTION MANUAL BEFORE INCORRECT WIRING WILL DAMAGE THE PROCEEDING WITH THE INSTALLATION ELECTRICAL CONTROL PANEL...
SETTING UP To switch ON the heater To switch OFF fan • • Switch the fused isolator switch ON (supply Set ON/STANDBY switch to STANDBY customer) • Stop Switch the heater ON/OFF selector to “ON” • • Turn the selector switch to STOP Turn the thermostat to the desired temperature •...
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 Benson Heating In the case of claims for damage this must be reported in writing within 24Hrs of delivery, in...
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DIMENSION AND WEIGHT Type 1 – 2 – 3 – 4 Type A [mm] 1170 B [mm] 1327 1327 1327 1377 C [mm] D [mm] E [mm] F [mm] G [mm] H [mm] J [mm] ∅1 [mm] ∅2 [mm] ∅ [bsp] ½...
INSTALLATION It is a requirement that only qualified and competent Where the passage of cold air causes problems (eg by personnel may undertake installation commissioning entrances, loading bays etc) it is considered favourable and servicing of Heaters. if the heater is positioned so as the discharge towards or across the cold air source from a distance from 1.5m - 6m dependent upon the size of the entrance WARNING...
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Minimum area around appliance SOME EXAMPLES FOR INSTALLATION Installation outside the room to be heated (but in any event protected from atmospheric agents) with warm air intake duct and air recycling. Installation inside the room to be heated with duct for warm air intake. Key: 1.
WALL BRACKET DIMENSIONS WARNING The support brackets are designed to support ONE HEATER ONLY. It is the responsibility of the installer to ensure that all fixing brackets are properly secure...
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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: •...
FLUE AND COMBUSTION OPTIONS Room sealed unit heaters are suitable for installation with the following flue configurations : B Option B • In this configuration the heater is connected to a single All joints should be sealed • flue pipe to discharge the products of combustion It must be properly secured so as to remain stable outside the building either through the roof or through a at all times...
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: Flue pipe to outside wall combustion air from inside building Type 1 – 2 – 3 MAX 500 ✴ 157 mm type 1 – 2 165 mm type 3 1400 Type 4 – 5 – 6 MAX 500 1400 ITEM DESCRIPTION Flue pipe M/F ∅100 L=1000 with seal...
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: Flue pipe to outside wall maximum distance, combustion air from inside building Type 1 – 2 – 3 MAX 5000 1400 ✴ 157 mm type 1 – 2 165 mm type 3 Type 4 – 5 – 6 MAX 5000 1400 ITEM DESCRIPTION...
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: Single flue option with roof terminal combustion airfrom inside building Type 1 – 2 – 3 Ø100 1400 ✴ 157 mm type 1 – 2 165 mm type 3 ITEM DESCRIPTION Flue pipe M/F ∅100 L=1000 with seal Bend 90° M/F ∅100 with seal Terminal with guard ∅...
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Type 4 – 5 – 6 Ø100 1400 ITEM DESCRIPTION Flue pipe M/F ∅100 L=1000 with seal Bend 90° M/F ∅100 with seal Terminal ∅100 IMPORTANT: MODEL 4-5-6 ∅ FLUE SPIGOT SIZE ∅100 male ∅ COMBUSTION AIR SPIGOT ∅150 male INSTALLATION Flue should be adequately supported Each bend corresponds to about 0,8-1 meter of horizontal pipe work...
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: Flue discharge and combustion air inlet through wall two independant pipe kit. Type 1 – 2 – 3 MAX 500 ✴ 157 mm type 1 – 2 165 mm type 3 1400 Type 4 – 5 – 6 MAX 500 1400 ITEM DESCRIPTION...
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: Flue discharge and combustion inlet two independant pipe kit maximum distance. Type 1 – 2 – 3 MAX 2500 1400 Type 4 – 5 – 6 MAX 2500 1400 ITEM DESCRIPTION Flue pipe ∅100 L=1000 with seal Flue terminal with guard ∅100 Combustion air terminal with guard ∅100 Combustion air pipe M/F ∅150 L=1000 with seal Combustion air terminal with guard ∅150...
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: Horizontal co axial wall kit Type 1 – 2 – 3 MAX 200 1400 ✴ 157 mm type 1 – 2 165 mm type 3 Type 4 – 5 – 6 MAX 350 1400 ITEM DESCRIPTION Flue pipe M/F ∅100 L=500 with seal Horizontal wall kit ∅100-100 Horizontal wall kit ∅100-150 Combustion Air pipe M/F ∅150 L=500 with seal...
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: Co axial wall kit maximum installation distance Type 1 – 2 – 3 MAX 320 MAX 2500 1400 ✴ 157 mm type 1 – 2 165 mm type 3 Type 4 – 5 – 6 MAX 300 MAX 2500 1400 ITEM DESCRIPTION...
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Vertical coaxial flue kit Type 1 – 2 – 3 Ø100 Ø100 1400 ✴ 157 mm type 1 – 2 165 mm type 3 ITEM DESCRIPTION Flue pipe M/F ∅100 L=1000 with seal Bend 90° M/F ∅100 with seal Vertical coaxial roof kit ∅100-100 IMPORTANT: MODEL 1-2-3...
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Type 5 – 6 – 7 Ø160 Ø150 Ø100 1400 ITEM DESCRIPTION Flue pipe M/F ∅100 L=1000 with seal Combustion air pipe M/F ∅150 L=1000 with seal Bend 90° M/F ∅150 with seal Vertical co axial roof terminal ∅100-150 Adaptor F/F ∅150 L=200 with seal Bend 45°...
ELECTRICAL PANEL The exploded view shows control panel for type 5 and 6. Lockout reset Control box cover Lockout indication Red Differential pressure switch Over temperature indication Yellow 10. Fuse holder (type 5 and 6) only Operating light green 11. Neutral connection with fuse (type 5 and 6) only Flame control circuit 12.
ELECTRICAL CONNECTIONS The heaters are supplied with the electric panel fitted and pre wired Connection is required to Ensure that the mains isolator is turned OFF before undertaking any electrical on • The mains electrical supply the heater. Access to the electrical panel is •...
DUCT CONNECTIONS • • Air intake Air delivery Connect any air intake ducts to the special opening in Connect the warm air distribution ducts to the front the intake plenum, interposing an anti-vibration joint to delivery flange of the appliance, interposing an anti- avoid transmission of vibration in the ducts.
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When the burner has ignited check the manometer and, adjust gas pressure setting to pressure indicated WARNING! on data plate, adjust by turning the solenoid valve The heater must only be operated with the burner screw on gas valve. compartment door(s) closed •...
GAS CONVERSION The heaters are supplied ready for use with (G20) Natural Gas set as per the table below Conversion kits are available from the manufacturer Natural Gas H (G20) TYPE Number of injectors N° Diameter of injector mm/100 Gas supply pressure mBar Head pressure 13,0...
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GAS PRESSURE SETTINGS To regulate the gas inlet pressure : • Connect a manometer to the main inlet pressure test point (PM) • Ensure that the gas supply pressure is correct as per the table provided: To regulate the head pressure: •...
Diaphram assembly: Diagram showing the fitting of a diaphram plate for Diagram showing the fitting of a diaphram plate for the primary air single burner manifold the primary air for two burner manifolds Heater types 1-2-3-5 Heater types 4-6 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 Ensure that all of the additional gas components are...
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The driven viariable pitch pulley drive and fixed fan If may be necessary to adjust the motor pulley to pulley are factory pre set and are suitable for most achieve correct motor running current as motor plate. applications. For short duct lenghts and free blowing applications the To check electrical absorption of the motor proceed motor pulley may be changed to a large size to further as follows:...
CONTROLS • To ensure that the heater is working correctly certain Check the operation of the control and limit criteria need to be checked . Start up heater and check thermostats TR, SND, LM. • the following Check that the room thermostat operates the burner not the fan.
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• • CLEANING OF EXHAUST EXTRACTOR CLEANING OF BURNER Cleaning of the exhaust extractor consists of the Cleaning of the burner takes place by removing it from mechanical removal of dust and any foreign substances its housing and removing any scale which may have which may have been deposited on the fan.
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 Check main isolator. Check supply cables. No operation No electrical supply Check line fuses.
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Burner lights but cuts out Check polarity electrical Phase and Neutral inverted after 5 seconds supply Check electrical connection to the probe. Faulty ionization probe Check probe Change ionization probe. Check that the gas type is suitable for heater Check gas pressure Faulty ignition Check head pressure.
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Check that the gas type is The burner goes out due to suitable for heater intervention thermostat SND; Check gas pressure Excessive heat exchanger restarted automatically when temperature heater has cooled down Check head pressure. Yellow light on. Check injector size is correct for the heater Check that the fan blades are clean.
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Control box will not reset. Change control module check Faulty flame control module electrical connections Red light illuminated Change fan control or SND Fan works intermittently Faulty FAN operation thermostat Check that the gas type is suitable for heater Check gas pressure Insufficient gas pressure Check head pressure.
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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 02/01/03 Rev. 0 Cod. 016-MN...
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