Gas fired room sealed unit heaters centrifugal TECHNICAL INFORMATION, ASSEMBLY INSTRUCTIONS, USE AND MAINTENANCE RS/UHC / UF RS/UHC-2 / 2UF BENSON HEATING LUDLOW ROAD KNIGHTON POWYS, LD71LP U.K.
COMPLIANCE NOTICES The Benson RS/UHC range of warm air heaters detailed herewith are manufactured for Benson Heating within the parameters of ISO 9002.
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'.
INDEX GENERAL Description of equipment Identification Description Technical data Wiring diagram Remote control connections page.
DESCRIPTION OF EQUIPMENT Control and safety thermostat The heater is controlled by three thermostats pre set to the following. 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%.
IDENTIFICATION If the TECHNICAL DATA is lost or damaged ask Benson Technical Department for duplicate . Check code and model is as data plate.
DESCRIPTION Type 1÷4 NOTE: Heaters type 1, 2, 3 have a single burner manifold. Heaters type 4 have two burner manifolds 19. Red light lockout indication 20. Lockout reset 21. Gas inlet connection 22. Electrical connections 23. Combustion intake air spigot 24. Flue spigot 25. Inlet casing 26. Fan Motor 27. Centrifugal Fan 28. Gas Solenoid valve 29. Ignition electrode 30. Gas pressure manifold test nipple 31. Flame detection electrode 32. Flame check aperture 33. Flue venter 34. Air inlet grille 35.
Type 5 and 6: NOTE: Heaters type 5 are supplied with 2 opposing burner manifolds Heaters type 6 are supplied with 4 opposing burner manifolds 1. Regulation thermostat 2. LIMIT thermostat 3. FAN thermostat 4. Flue venter inspection door 5. Flue pipe 6. Flue manifold 7. Outlet Grille 8. Controls Compartment 9. Heat exchanger 10. Gas manifold 11. Gas injector 12. Combustion chamber 13. Burner plate insulation 14. Burner tubes 15. Ignition transformer 16. Left burner casing 17. Flue ducting 18. Deflector 19.
TECHNICAL DATA DESCRIPTION HEAT OUTPUT HEAT INPUT (Nett) EFFICIENCY AIR FLOW +15°C MAX AIR OFF (ΔT) HEAT INPUT MIN (two stage) MIN AIR OFF (ΔT) (two stage) STATIC PRESSURE (standard) STATIC PRESSURE (uprated) THERMOSTAT CALIBRATION - TR (auto reset) - LM (manual reset) - SND (auto reset) FAN OPERATION - Fan on - Fan off Air pressure switch setting Maximum flue resistanceI CENTRIFUGAL FAN - Type - Number ELECTRICAL SUPPLY RATED INPUT standard motor) RATED INPUT (up rated motor) RUNNING CURRENT MAX( standard
WIRING DIAGRAM Schematic layout: Heaters type 1-2-3 C EVG1-II° EVG1-I° TR SND LM FAN N J5 J12 II° SF F2 N J6 L LF J1 IMT J10 LL J18 J15 LB Electrical supply single phase 230V 50Hz I° F1 J9 J13 RST J16 MS TA J14 J2 J11 J17 J8 J4 J7 RSTR VM SE IGN1 NA NC EA1 COM EF ION PA KEY: SND TR LM EVG1-I° EVG1-II° C FAN F1-F2 LF LL LB RST EF PA IGN1 Temperature control probe Regulatory control thermostat(auto reset) LIMIT thermostat (manual reset) Gas solenoid valve Gas so
EVG1-I° EVG1-II° Heater type 2-3 up rated fan TR SND LM FAN I° J12 II° SF F2 J6 J9 J5 F1 LF RT J1 LL CNT J15 J10 LB J13 J18 RST MS J16 F TA J14 J2 J11 J17 J8 J4 J7 RSTR VM SE IGN1 NA NC EA1 COM EF ION N L PA Electrical supply single phase 230V 50Hz KEY: SND TR LM EVG1-I° EVG1-II° C FAN F1-F2 LF LL LB RST EF PA IGN1 EA1 Temperature control probe Regulatory control thermostat(auto reset) LIMIT thermostat (manual reset) Gas solenoid valve Gas solenoid min (two sta
EVG1-I° EVG1-II° Heater type 4 TR SND LM FAN I° J12 II° SF F2 J6 J9 J5 F1 LF RT J1 LL CNT J15 J10 LB J13 J18 RST MS J16 F TA J14 J2 J11 J17 J8 J4 J7 RSTR VM IMT SE IGN1 NA NC EA1 COM EF ION N L1 L2 L3 PA Electrical supply threephase 400V 50Hz 3N KEY: SND TR LM EVG1-I° EVG1-II° C FAN F1-F2 LF LL LB RST EF PA IGN1 EA1 Temperature control probe Regulatory control thermostat(auto reset) LIMIT thermostat (manual reset) Gas solenoid valve Gas solenoid min (two sta
EVG1-II° EVG2-II° TR EVG1-I° EVG2-I° Heaters type 5-6 SND LM FAN I° J12 SF F2 RT J1 LL CNT J15 J10 LB II° J6 J9 J5 F1 LF J13 J18 RST MS J16 F TA J14 J2 J11 J17 J8 J4 J7 RSTR VM IMT SE IGN1 EA2 NA NC EA1 COM IGN2 EF ION N L1 L2 L3 PA ALIMENTAZIONE ELETTRICA TRIFASE 400V 50Hz 3N KEY: SND TR LM EVG1-I° EVG2-I° EVG1-II° EVG2-II° FAN F1-F2 LF LL LB RST EF PA IGN1 IGN2 Temperature control probe Regulatory control thermostat(auto reset) LIMIT thermostat(manual r
REMOTE CONTROL CONNECTIONS Connection to CP2A Key: B BK BN GR G K Blue Black Brown Grey Green Pink M O P R W Y Magenta Orange Purple Red White Yellow This wiring to be completed by the installer READ THE INSTRUCTION MANUAL BEFORE PROCEEDING WITH THE INSTALLATION INCORRECT WIRING WILL DAMAGE THE ELECTRICAL CONTROL PANEL THIS HEATER IS NEUTRALLY SWITCHED ENSURE THE WIRING IS CORRECT TO THE DIAGRAMS PROVIDED 14
OPERATION To switch OFF fan • Set ON/STANDBY switch to STANDBY 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 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 To switch OFF the heater • Turn the thermostat t
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 pressed (if fitted with remote controls the remote reset button will reset this switch).
DIMENSION AND WEIGHT Type 1 – 2 – 3 – 4 Type A [mm] B [mm] C [mm] D [mm] E [mm] F [mm] G [mm] H [mm] J [mm] K [mm] L [mm] ∅1 [mm] ∅2 [mm] ∅ [bsp] Nett weight [kg] 17 (1) female (2) male Note: Heater type 5 has two centrifugal fans.
Type – 5 – 6 Type A [mm] C [mm] H [mm] J [mm] ∅ [bsp] Nett weight [kg] 18 male male 20 5 1720 1300 1640 1200 ¾ 267 6 1960 1540 1885 1440 ¾ 311
INSTALLATION It is a requirement that only qualified and competent personnel may undertake installation commissioning and servicing of Heaters. Where the passage of cold air causes problems (eg by entrances, loading bays etc) it is considered favourable 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 and the air throw characteristics of the heater.
INSTALLATION CLEARANCES min. 700 For the correct operation of heater and for maintenance purposes the following minimum clearances around the heater should be observed * min. 700 ✴ Minimum200 mm type1 – 2 – 3 – 4 Minimum 700 mm type 5 – 6 Heater with warm air duct air inlet from below heater only min 400 min. 200 Heater with warm air duct air inlet from rear and below heater. min 400 min.
EXAMPLES OF INSTALLATION Further examples L INSTALLATION: • Internal installation • Mounted on wall brackets (1) • Ducted warm air outlet (2) • Open return air or ducted (3) from inside the building • Filter (4) Air Inlet casing (5) Type 1÷3 4÷6 5 4 2 1 L 360 410 3 1635 5 4 2 INSTALLATION: • Internal installation • Mounted on flat surface or beam (6) • Ducted warm air outlet (2) • Open return air or ducted from rear (3) • Filter (4) Air inlet casing (5) 3 6 L L1 INSTALLATION: • Internal ins
ACCESSORIES Available accessories: NO.
GAS CONNECTION • Conection of the heater to the gas supply, whetherNatural Gas or L P G , must be carried out in compliance with the installation laws and by qualified personnel. The warm air heater is factory set to work with (G20) Natural Gas. A (G31) Propane kit is also available • Before connecting the heater it is necessary to make sure that.: • The correct type of gas for which the equipment has been set up for is available. • The gas pipes are clean and free from debris .
FLUE AND COMBUSTION OPTIONS Room sealed unit heaters are suitable for installation with the following flue configurations : B22 - C12 - C32 .
B22: Single pipe flue to outside wall or roof terminal. Combustion air from inside building L1 Ø100 MIN. 400 L2 MAX 500 Ø100 MIN 400 INSTALLATION DISTANCES FOR FLUE PIPE: HORIZONTAL FLUE TYPE UNIT L1 MIN. L1 MAX. 1 m 1,00 5,00 2 m 1,00 5,00 3 m 1,00 5,00 4 m 1,00 5,00 5 m 1,00 5,00 6 m 1,00 5,00 • • • • VERTICAL FLUE L2 MIN. L2 MAX.
C12: Horizontal flue installation twin pipe and concentric flue terminals. L1 * Ø100 MIN. 400 ✴ 100 mm type 1 – 2 – 3 150 mm type 4 – 5 – 6 MAX 500 L2 Ø150 * Ø100 MIN. 400 MAX 300 INSTALLATION DISTANCES FOR FLUE PIPE: TWIN PIPE SYSTEW TYPE UNIT L1 MIN. L1 MAX. 1 m 1,00 2,50 2 m 1,00 2,50 3 m 1,00 2,50 4 m 1,00 2,50 5 m 1,00 2,50 6 m 1,00 2,50 • • • • HORIZONTAL CONCENTRIC TERMINAL L2 MIN. L2 MAX.
C32 Concentric vertical roof terminal Ø150 L1 Ø100 * ✴ 100 mmtype 1 – 2 – 3 150 mm type 4 – 5 – 6 INSTALLATION DISTANCES FOR FLUE PIPES: TYPE UNIT 1 2 3 4 5 6 m m m m m m • • • • VERTICAL ROOF TERMINAL L1 MIN. 0 0 0 0 0 0 L1 MAX.
ELECTRICAL PANEL AND CIRCUIT BOARD Panel illustrated is fitted to type 5 and 6. 1. 2. 3. 4. 5. 6. 7. Lockout reset Red lockout indication light Yellow temperature indication light Green operating light Flame control circuit Remote connection Line fuse 3.15 Amp 8. 9. 10. 11. 12. 13. 14.
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. The cover to the electrical panel can be removed by undoing the screws which secure it to the panel.
RETURN AIR CONNECTIONS The heater is supplied with 2 return air connecctions one at the rear and one underneath: a. Return air from direction “A”; b. Return air from direction “B”; c. Return air from both direction “A” and “B”. A The heater is supplied with a grille at the rear and a blank panel underneath, both the grille and panel are interchangable the fixing points and dimensions of the return air plenum are detailed below.
INITIAL START UP Before each attempt at ignition necessary to wait at least 10 seconds. VENTILATION • Switch 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 it is 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.
GAS CONVERSION The heaters are supplied ready for use with (G20),Natural Gas as per the table below LPG Conversion kits are available from the manufacturer: Natural Gas (G20) TYPE Number of injectors Diameter of injectors Gas supply pressure Head pressure max Head pressure min (two stage) 1 1 410 2 1 480 3 1 555 13,0 7,0 13,0 6,5 13,0 6,5 4 2 500 20 mBar 10,0 7,0 5 2 540 6 4 450 N° mm/100 13,0 6,5 10,5 5,0 mBar mBar Before converting the heater to LPG ensure that the gas supply is isolated con
GAS PRESSURE SETTINGS To regulate the gas inlet pressure : • Connect a manometer to pressure test point (PM) • Ensure that gas supply pressure is sufficient as detailed the table in the manual provided : To regulate the head pressure at the injectors: • Connect a manometer to pressure test point (PV) • Adjust the pressure untill it is correct to the data supplied in the following table: VERSION SINGLE STAGE Propane Gas (G31) TYPE Gas inlet pressure Head pressure max Head pressure min (two stage) 1 VERSIO
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 pressare. Anti clockwise to decrease the pressare. On completion replace the plastic cover and seal with paint. Remove manometer ensuring that the test point screw is gas tight.
FAN To check electrical absorption of the motor proceed as follows: • Insert the ammeter on a phase of the general supply line • Set the appliance to summer ventilation, so as to exclude all other equipment (burner and auxiliary parts) Read the absorption figure on the ammeter and compare it with the plate data for the motor shown in the TECHNICAL DATA chapter. The driven variable pitch pulley drive and fixed fan pulley are factory pre set and are suitable for most applications.
MAINTENANCE 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 1 200 1 200 2 2 1.
CLEANING OF HEAT EXCHANGER Cleaning of the heat exchanger must be carried out by authorized personnel and is governed by specific regulations. As a guideline cleaning should take place at least once a year, at the beginning of the winter.
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.
Explosive start up Faulty ignition electrode Change ignition electrode Reposition electrode correctly over the burner bar Change burner tube Change transformer Check that the gas type is suitable for heater Check gas pressure Check head pressure. Check gas supply pipes have been purged of air. Check heat exchanger Check air intake pipes are not blocked .
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 Excessive air temperature due to poor air flow. Control box will not reset.
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 15/09/03 Rev. 1 Cod.
