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.
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
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 Regulating the air flows pag.
DESCRIPTION OF EQUIPMENT Control and safety thermostats 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 Dept. for a duplicate. Check code and model is as data plate.
DESCRIPTION Types 1 - 5 1 2 4 5 6 15 7 17 8 9 3 10 13 18 19 20 12 16 11 14 15 32 31 24 30 23 27 21 28 22 29 25 26 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 Heaters type 5 have two axial fans 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16.
Type 6 - 7 1 2 5 6 4 16 17 7 19 8 9 3 10 13 15 10 13 20 21 22 12 11 14 14 11 18 34 17 35 26 33 25 23 29 32 24 31 30 28 27 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. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18.
TECHNICAL DATA DESCRIPTION HEAT OUTPUT HEAT INPUT (Nett) EFFICIENCY AIR FLOW +15°C MAX AIR OFF (T) FAN SPEED Max SOUND LEVEL max @ 6m MIN AIR OFF (T) ( Two Stage) MIN AIR OFF (T) ( Dual Power) HEAT INPUT (Min) (Two Stage and Dual Power) FAN SPEED Min (Dual Power) SOUND LEVEL min @ 6m Thermostat calibration Thermostat TR (auto reset) Thermostat LM (manual reset) Thermostat SND (auto reset) Fan operation Fan on Fan off Air pressure switch setting Maximum flue resistance Axial fan Number Diameter Fan throw
WIRING DIAGRAM SINGLE AND TWO STAGE Type 1-2-3-4-5 C EVG1-II° EVG1-I° TR C SND FAN 1 FAN 2 LM N I° LF J12 II° SF F2 J15 J10 LB N IMT J1 LL J13 J18 RST J16 MS TA J14 J2 J11 J17 J8 J4 J7 RSTR VM SE IGN1 NA NC COM EF EA1 ION PA KEY SND TR LM EVG1-I° EVG1-II° C FAN 1 FAN 2 F1-F2 LF LL LB RST EF Temperature probe Regulatory control thermostat (auto reset) LIMIT thermostat (Manual reset) Gas solenoid valve 1 Second stage gas valve 1 (Two Stage version only) Fan capacitor
Type 6-7 C C EVG1-II° EVG2-II° TR EVG1-I° EVG2-I° C SND FAN 1 FAN 3 FAN 2 LM N I° J12 II° SF IMT J15 LB J10 J1 LL N J6 L F2 J13 J18 RST J16 MS TA J14 J2 J11 J17 J8 J4 J7 RSTR VM SE IGN1 EA2 NA NC EA1 COM IGN2 EF ION PA KEY: SND TR LM EVG1-I° EVG1-II° Temperature probe Regulatory control thermostat (auto reset) LIMIT thermostat (manual reset) Gas solenoid valve 1 Second stage gas valve 1 (Two Stage version only) EVG2-I° Gas solenoid valve 2 EVG2-II° Second
WIRING DIAGRAM DUAL POWER Type 1-2-3-4-5 EVG1-I° TR C EVG1-II° C FAN 1 SND FAN 2 LM I° J12 II° SF F2 N J10 J15 LB J13 J18 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 1 FAN 2 F1-F2 LF LL LB RST EF Temperature probe Regulatory control thermostat (auto reset) LIMIT thermostat (Manual reset) Gas solenoid valve 1 Second stage gas valve 1 Fan capacitor Axial fan 1 Axial fan 2 (type 5) Line fuses Green
Type 6-7 C C EVG1-II° EVG2-II° TR EVG1-I° EVG2-I° C SND FAN 1 FAN 3 FAN 2 LM N I° J12 II° SF IMT J15 LB J10 J1 LL N J6 L F2 230V ~ 50Hz J9 J5 F1 LF J13 J18 RST J16 MS TA J14 J2 J11 J17 J8 J4 J7 RSTR VM SE IGN1 EA2 NA NC EA1 COM IGN2 EF ION PA KEY: SND TR Temperature probe Regulatory control thermostat 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 stag
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 THAT THE WIRING IS CORRECT TO THE DIAGRAMS PROVIDED.
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.
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 Heater types 1, 2, 3, 4, 5 15 Type A [mm] B [mm] C [mm] D [mm] E [mm] F [mm] G [mm] 1 [mm] 2 [mm] [bsp] Nett weight [kg] 15 530 15 C 1 610 770 370 563 140 132 132 100 (1) 100 (1) ½ 65 2 665 770 425 563 140 132 132 100 (1) 100 (1) ½ 67 3 745 770 505 563 140 132 132 100 (1) 100 (1) ½ 73 4 925 770 685 555 140 132 132 100 (1) 100 (1) ½ 92 15 (1) female (2) male Ø1 Ø2 315 D 860 E 17 G F Ø 130 B Note: Heater type 5 has two fans.
Heater types 6, 7 225 225 Type A [mm] C [mm] [bsp] Nett weight [kg] 6 1720 1270 ¾ 171 7 1960 1510 ¾ 205 15 530 15 C Ø100 male 132 Ø150 male 860 315 510 185 18 115 Ø 820 NOTE heaters type 7 have three fans 18 130 A
INSTALLATION The location chosen for the heater must allow for the fitting of an effective flue system. Note It is a requirement that only qualified and competent personnel may undertake installation commissioning and servicing of Heaters manufacturer.
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: Type 5-6-7 Type 1-2-3-4 Type C 1 370 2 425 3 505 4 685 20 5 530 6 1337 7 1577
Examples of positioning in small and medium spaces Examples of positioning in large areas 500 500 Installation heights and minimum distances from walls and ceilings 700 2500-3000 700 2500-3000 700 21
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.
FLUE AND COMBUSTION OPTIONS Room sealed unit heaters are suitable for installation with the following flue configurations : B 22 - C 12 - C 32 .
B 22 : Installation showing dimensions with flue terminal external to building and internal combustion air L1 Ø100 MIN 400 L2 MAX 500 Ø100 MIN. 400 MAXIMUM FLUE LENGTHS: TYPE UNIT 1 2 3 4 5 6 7 m m m m m m m FLUE EXIT HORIZONTAL L1 MIN. L1 MAX. 1,00 5,00 1,00 5,00 1,00 5,00 1,00 5,00 1,00 5,00 1,00 5,00 1,00 5,00 FLUE EXIT VERTICAL L2 MIN. L2 MAX.
C 12 :Installation showing both horizontal concentric flue discharge, and horizontal independent pipe kit. L1 * Ø100 MIN. 400 MAX 500 ✴ MAX 320 100 mm type 1 – 2 – 3 – 4 150 mm type 5 – 6 – 7 * Ø100 L2 MAXIMUM FLUE LENGTHS: TYPE UNIT 1 2 3 4 5 6 7 m m m m m m m INDEPENDENT PIPE KIT L1 MIN. L1 MAX. 1,00 2,50 1,00 2,50 1,00 2,50 1,00 2,50 1,00 2,50 1,00 2,50 1,00 2,50 HORIZONTAL CONCENTRIC FLUE L2 MIN. L2 MAX.
C 32 Installation showing vertical combustion air external to building concentric flue terminal roof installation 150 Ø100 L1 * ✴ 100 mm type 1 – 2 – 3 – 4 150 mm type 5 – 6 – 7 MAXIMUM FLUE LENGTH: TYPE UNIT 1 2 3 4 5 6 7 m m m m m m m VERTICAL ROOF TERMINAL L1 MIN. 0 0 0 0 0 0 0 L1 MAX. 10,00 10,00 10,00 10,00 10,00 10,00 10,00 Only flue components and accessories supplied by the manufacturer should be used on installation.
ELECTRICAL PANEL WITH CIRCUIT BOARD 7 6 6 6 5 4 3 2 8 1 9 1. 2. 3. 4. 5. 6. 7. 8. 9.
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. One electrical panel 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.
INITIAL START UP SINGLE STAGE 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 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’.
INITIAL START UP TWO STAGE AND DUAL POWER 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’.
GAS SOLENOID VALVES Model SIT 843 (two stage) Model SIT 840 (single stage) PM PV RP RP1 RP2 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.
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 Diameter of injectors 1 1 190 2 1 250 3 1 280 Replacing injector in the manifold heater (Type 1, 2, 3, 4, 6) 4 1 335 5 2 285 6 2 320 7 4 255 Replacing injectors 2per manifold for heater (Type 5, 7) Check that the size of the injector corresponds to that on the data plate.
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: Connect the manometer to the head pressure test point (PV) Ensure the head pressure is correct to the tables provided RS/UHA-2 RS/UHA-4 RS/UHA Propane gas (G31) TYPE Gas supply pressure Head pressure max Head pressure min (two stage power) -dual 1 2 3 5
Diaphragm 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) Heater types (5, 7) WARNING the diaphram plates should only be used when using propane gas G31 .
CHECKS To ensure that the heater is working correctly certain criteria need to be checked. Start up heater and check the following 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 flow is sufficient to cool the heat exchanger.
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.
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. Check line fuses. Check electrical connections No operation No electrical supply No spark 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. Check heat exchanger Check air intake pipes are not blocked . Check flue pipes are not blocked check operation of flue venter Replace differential pressure switch Check position of thermostat Check that the gas type is suitable for heater Check gas pressure Check head pressure.
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 Change thermostat Check fan capacitor Check fan motor. Check electrical absorption Replace fan motor. Change fan control or SND thermostat Check that the gas type is suitable for heater Check gas pressure Check head pressure.
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.
