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- Page 1 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...
- Page 2 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.
- Page 3 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'.
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Page 4: Table Of Contents
INDEX GENERAL Description of equipment pag. Identification “ Description “ Technical data “ Wiring diagram “ Remote control connections “ Regulating the air flows “ FOR THE USER Operation “ Servicing “ Heater indicator lights “ Receipt of product “ Transport “... - Page 5 DESCRIPTION OF EQUIPMENT Heat exchanger Control and safety thermostats 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 in Capillary type.
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Page 6: Identification
IDENTIFICATION If the technical data is lost or damaged ask Benson Technical Dept. for a duplicate. Check code and model is as data plate. Position of data plate Manufacturer AIR HEATER M odel Serial Number ountry ategory Year ominal heat INPUT... -
Page 7: Description
DESCRIPTION Types 1 - 5 NOTE: Heaters type 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, have one axial fan only ... - Page 8 Type 6 - 7 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. Control thermostat TR 19. Green power on LED Limit thermostat LM 20.
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Page 9: Technical Data
TECHNICAL DATA DESCRIPTION TYPE UNIT HEAT OUTPUT 13,8 23,0 30,5 41,7 58,6 76,6 94,3 47.000 78.500 104.000 142.000 200.000 261.500 322.000 HEAT INPUT 15.0 25.4 33.8 46.3 65.0 85.0 104.7 (Nett) 52.000 86.000 115.000 158.000 224.000 290.000 357.000 EFFICIENCY 92,0 90,1 90,2 90,1... -
Page 10: Wiring Diagram
WIRING DIAGRAM SINGLE AND TWO STAGE Type 1-2-3-4-5 FAN 1 FAN 2 I° II° RSTR IGN1 Temperature probe Differential pressure switch Regulatory control thermostat (auto reset) IGN1 Ignition transformer LIMIT thermostat (Manual reset) Spark electrode EVG1-I° Gas solenoid valve 1 Ionisation probe EVG1-II°... - Page 11 Type 6-7 FAN 3 FAN 1 FAN 2 I° II° RSTR IGN1 IGN2 KEY: Temperature probe Lockout reset button Regulatory control thermostat (auto reset) Flue venter LIMIT thermostat (manual reset) Differential pressure switch EVG1-I° Gas solenoid valve 1 IGN1 Ignition transformer 1 EVG1-II°...
- Page 12 WIRING DIAGRAM DUAL POWER Type 1-2-3-4-5 FAN 1 FAN 2 I° II° COMM HIGH RSTR IGN1 Temperature probe Differential pressure switch Regulatory control thermostat (auto reset) IGN1 Ignition transformer LIMIT thermostat (Manual reset) Spark electrode EVG1-I° Gas solenoid valve 1 Ionisation probe EVG1-II°...
- Page 13 Type 6-7 FAN 1 FAN 2 FAN 3 I° II° RSTR IGN1 IGN2 KEY: Temperature probe Flue venter Regulatory control thermostat (auto Differential pressure switch reset) IGN1 Ignition transformer 1 LIMIT thermostat (Manual reset) IGN2 Ignition transformer 2 EVG1-I° Gas solenoid valve 1 Spark electrode 1 EVG1-II°...
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Page 14: Remote Control Connections
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 READ THE INSTRUCTION MANUAL BEFORE INCORRECT WIRING WILL DAMAGE THE PROCEEDING WITH THE INSTALLATION. -
Page 15: Servicing
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. HORIZONTAL Ensure that the horizontal louvres are set so as to evenly distribute the air in the area to be heated they should be opened at a minimum of 45 degrees This will ensure that there is sufficient air flow over the chamber and will avoid nuisance overheat lockout... -
Page 16: Heater Indicator Lights
HEATER INDICATOR LIGHTS 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... -
Page 17: Dimension
DIMENSION Heater types 1, 2, 3, 4, 5 Type A [mm] 1170 B [mm] C [mm] D [mm] E [mm] F [mm] G [mm] 1 [mm] 2 [mm] [bsp] ½ ½ ½ ½ ¾ Nett weight [kg] (1) female (2) male Ø1 Ø2... - Page 18 Heater types 6, 7 Type A [mm] 1720 1960 C [mm] 1270 1510 [bsp] ¾ ¾ Nett weight [kg] Ø100 male Ø150 male Ø NOTE heaters type 7 have three fans...
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Page 19: Wall Bracket Dimensions
INSTALLATION Note The location chosen for the heater must allow for It is a requirement that only qualified and competent the fitting of an effective flue system. personnel may undertake installation commissioning and servicing of Heaters manufacturer. 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 WARNING... - Page 20 Diagram showing the installation limits for independent pipe horizontal flue options when using wall support brackets: Type Type 1-2-3-4 5-6-7 Diagram showing the installation limits for horizontal concentric flue options when using wall support brackets: Type Type 1-2-3-4 5-6-7 Type 1337 1577...
- Page 21 Examples of positioning in small and medium spaces Examples of positioning in large areas Installation heights and minimum distances from walls and ceilings...
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Page 22: Gas Connection
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: ... -
Page 23: Flue And Combustion Options
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... - Page 24 : Installation showing dimensions with flue terminal external to building and internal combustion air MIN 400 MAX 500 Ø100 MIN. 400 MAXIMUM FLUE LENGTHS: FLUE EXIT HORIZONTAL FLUE EXIT VERTICAL TYPE UNIT L1 MIN. L1 MAX. L2 MIN. L2 MAX. 1,00 5,00 1,00...
- Page 25 :Installation showing both horizontal concentric flue discharge, and horizontal independent pipe kit. MIN. 400 MAX 500 ✴ 100 mm type 1 – 2 – 3 – 4 150 mm type 5 – 6 – 7 MAX 320 MAXIMUM FLUE LENGTHS: INDEPENDENT PIPE KIT HORIZONTAL CONCENTRIC FLUE TYPE...
- Page 26 Installation showing vertical concentric flue terminal roof installation combustion air external to building Ø100 ✴ 100 mm type 1 – 2 – 3 – 4 150 mm type 5 – 6 – 7 MAXIMUM FLUE LENGTH: VERTICAL ROOF TERMINAL TYPE UNIT L1 MIN.
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Page 27: Electrical Panel With Circuit Board
ELECTRICAL PANEL WITH CIRCUIT BOARD Lockout reset Red lockout indication light Yellow temperature indication light Green operating light Flame control circuit Controls connection Safety fuses Control box cover Pressure differential switch ELECTRICAL CONNECTION The heaters are supplied with the electric panel fitted Claims for damage will not be considered if they have and pre wired Connection is required to resulted from incorrect wiring or the incorrect use of the... - Page 28 One electrical panel per heater is required, unless When external controls operate to switch the heaters are specified for multiple heater control heater OFF, power to the heater should applications. On no account should more than one remain to allow the fan to continue to operate heater be connected to a single time switch or sufficiently cool...
- Page 29 INITIAL START UP SINGLE STAGE VENTILATION When the burner has ignited check the manometer and, Switch on mains supply to the equipment adjust gas pressure setting to pressure indicated on data Set On/ Standby switch to ON plate, adjust by turning the solenoid valve screw on gas Set the remote control panel switch to VENT check that valve.
- Page 30 INITIAL START UP TWO STAGE AND DUAL POWER VENTILATION Before each attempt at ignition it is necessary to wait at least 10 seconds Switch on mains supply to the equipment When the burner has ignited check the manometer and, Set On/ Standby switch to ON adjust gas pressure high low settings to the pressure’s Set the remote control panel switch to VENT check that...
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Page 31: Gas Solenoid Valves
GAS SOLENOID VALVES Model SIT 840 (single stage) Model SIT 843 (two stage) Main inlet pressure test point Head pressure test point Pressure adjusting screws Cross cut screw low fire adjuster Hexagonal screw high fire adjuster 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... - Page 32 CHANGE INJECTORS: To change injectors Unscrew the natural gas injectors and replace with the correct size injectors for propane as shown in the table below: Propane Gas (G31) TYPE Number of injectors N° Diameter of injectors mm/100 Replacing injector in the manifold heater Replacing injectors 2per manifold for heater (Type 1, 2, 3, 4, 6) (Type 5, 7)
- Page 33 GAS PRESSURE 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: ...
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Page 34: Thermostat
Diaphragm assembly: Diagram showing the fitting of a diaphragm plate Diagram showing the fitting of a diaphragm plate for the primary air single burner manifold for the primary air for two burner manifolds Heater types (1, 2, 3, 4, 6) Heater types (5, 7) WARNING the diaphram plates should only be used when using propane gas G31 . -
Page 35: Checks
CHECKS To ensure that the heater is working correctly certain Check injector pressure is correct. criteria need to be checked. Start up heater and check Check temperature rise is correct to data plate. the following Check the operation of the control and limit thermostats TR, SND, LM. - Page 36 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. ...
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Page 37: Fault Finding
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. - Page 38 Check that the gas type is suitable for heater Check gas pressure Faulty ignition Check head pressure. Check gas supply pipes have been purged of air. Heat exchanger dirty Check heat exchanger Check air intake pipes are not Burner shuts down blocked .
- Page 39 Check that the horizontal and Excessive air temperature due (vertical if fitted) louvres are to poor air flow sufficiently open (see installation). Check fan is operating correctly with sufficient air flow Faulty Thermostat Change thermostat Check fan capacitor ...
- Page 40 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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