Gas room sealed unit heaters 2 stage TECHNICAL INFORMATION ASSEMBLY INSTRUCTIONS, USE AND MAINTENANCE RS/UHA-2 BENSON HEATING LUDLOW ROAD KNIGHTON POWYS LD7 1LP MAY 2003 Benson Heating is a divison of Benson Climate Systems Ltd
COMPLIANCE NOTICES The Benson RS/UHA2 range of warm air heaters detailed herewith are manufactured for Benson Heating within the parameters of ISO 9002.
INDEX GENERAL Description of equipment Identification Description Identification Description Technical data Wiring diagram Remote control connections Regulating air flow page.
Heaters type 1-2-3-4-5 C EVG1-II° EVG1-I° TR C SND FAN 1 FAN 2 LM N I° 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 valve1 Second stage gas valve 2 Fan capacitor Axial fan 1 Axial fan 2 (type 5) Line fuse (6,3 A) Green
Heater 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 KEY: SND TR LM EVG1-I° EVG2-I° EVG1-II° EVG2-II° C FAN 1 FAN 2 FAN 3 F1-F2 LF LL LB EF Temperature probe Regulatory control thermostat (auto reset) LIMIT thermostat (manual reset) Gas solenoid valve 1 Gas solenoid valve 2 Second stage gas valve 1
GAS CONVERSION The heaters are supplied ready for use with (G20) Natural Gas as per the table below Conversion kits are available from the manufacturer: Natural Gas (G20) TYPE Number of injectors Diameter of injectors Gas supply pressure Head pressure high fire Head pressure low fire 1 1 3,10 2 1 410 3 1 480 11,0 6,0 13,0 7,0 13,0 6,5 4 1 555 20 13,0 6,5 5 2 500 6 2 540 7 4 450 10,0 7,0 13,0 6,5 10,5 5,0 N° mm/100 mBar mBar mBar BEFORE CHANGING INJECTORS ENSURE GAS SUPPLY IS ISOLATED INSTRUCT
If the gas line has not been correctly purged ignition may not take place at the first attempt resulting in the heater going to lockout Reset the lockout before re starting ignition sequence The heater must only be operated with the burner compartment door(s) closed Before each attempt at ignition it is necessary to wait at least 10 seconds STOPPING • • • • • Connect the manometer on to the pressure test point PM and check inlet gas pressure if correct connect manometer to test point PV and start heate
Assembly of primary air diaphragm: Diagram showing the fitting of a primary air diaphragm to single burner manifold (1-2-3-4-6) Diagram showing the fitting of a primary air diaphragm for a two burner manifold type (7) Warning the diaphragm plates should only be used when using propane gas 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 be excluded.
FAULT FINDING If the heater is not working firstly check the following : • • • • Check electrical supply Check voltage is as stated +15%, -15% Check gas supply is on Check that the pressure is as stated in the TECHNICAL DATA FAULT CAUSE SOLUTION Check main isolator. No operation No electrical supply Check supply cables Check line fuses. Check electrical connections No spark ignition.
Burner lights but locks out after 5 seconds Live and neutral inverted Poor earth Check electrical connections Check electrical connection on probe. Faulty ionisation probe Check probe damage. for cracks or Replace ionisation probe . Check the gas type is suitable for the heater. Check the inlet gas pressure. Faulty ignition Check the head pressure. Check the gas supply pipes have been properly purged of air . Explosive start up.
Check inlet gas pressure Burner goes out due to the intervention of the SND thermostat and is restarted automatically when the heater has cooled down . Check burner head pressure Excessive heat temperature exchanger Check that gas type is suitable for heater Check injector size is correct for the heater. Yellow indication light on. Check the fan blades are clean Excessive air temperature due to insufficient air flow over heat exchanger.
Check inlet gas pressure Burner goes out due to the intervention of the LIMIT thermostat (LM). Check burner head pressure Excessive heat temperature. exchanger Check that gas type is suitable for heater Yellow light flashing Check injector size is correct for the heater. Check the fan blades are clean Excessive air temperature due to poor air flow over heat exchanger Check that the horizontal and (vertical if fitted) louvers are sufficiently open.
The control panel will not reset . Faulty flame control module Replace the flame control module after first checking the electrical connections Defective fan control Change fan control or SND thermostat Red light on Fan works intermittently Check that the gas type is suitable for the heater . Insufficient gas pressure Check the gas pressure Check burner head pressure. The fan does not work.
B22: Single flue option with condensate tee and roof terminal combustion air from inside the room Type 1 – 2 – 3 – 4
T MAX 10000 A V Ø100 * MIN 300 140 U 132 410 970 ✴ 157 mm type 1 – 2 – 3 165 mm type 4 ITEM A T U V DESCRIPTION Pipe M/F ∅100 L=1000 with seal Terminal with guard ∅100 Condensate Tee with drain point Pipe M/M ∅100 L=200 without seal NOTE IMPORTANT: MODEL ∅ FLUE SPIGOT ∅ COMBUSTION AIR SPIGOT INSTALLATION 1-2-3-4 ∅100 female ∅100 female Flue should be adequately supported each bend corresponds to approx 0,8-1 meter of horizontal pipe work
B22: Single flue option with condensate tee and roof terminal combustion air from inside the room Type 5 – 6 – 7 T MAX 10000 A Ø100 Z 132 165 MIN 340 U 410 970 ITEM A T U Z DESCRIPTION Pipe M/F ∅100 L=1000 with seal Terminal with guard ∅100 Condensate tee with drain point Pipe M/F ∅100 L=250 with seal NOTE IMPORTANT: MODEL ∅ FLUE SPIGOT SIZE ∅ COMBUSTION AIR SPIGOT SIZE INSTALLATION 5-6-7 ∅100 male ∅150 male Flue should be adequately supported Each bend corresponds to approx 0,8-1 meters of hori
C32 Installation showing Vertical co axial flue terminal with condensate drain Type 1 – 2 – 3 – 4 Ø150 L A Ø100 MAX 10000 A V Ø100 * MIN 300 140 U H H 132 175 235 970 ✴ 157 mm type 1 – 2 – 3 165 mm type 4 ITEM A H L U V DESCRIPTION Flue pipe M/F ∅100 L=1000 with seal Bend 90° M/F ∅100 with seal Vertical co axial roof terminal kit ∅100-100 Condensate tee with drain point pipe M/M ∅100 L=200 without seal NOTE IMPORTANT: MODEL ∅ FLUE SPIGOT SIZE ∅ COMBUSTION AIR SPIGOT SIZE INSTALLATION
C32 Installation showing Vertical co axial roof terminal with condensate drain Type 5 – 6 – 7 Ø160 N MIN 10000 A Ø150 165 Ø100 Z MIN 340 185 U 115 410 970 ITEM A F I N P Q R S U Z DESCRIPTION Pipe M/F ∅100 L=1000 with seal Pipe M/F ∅150 L=1000 with seal Bend 90° M/F ∅150 with seal Vertical co axial roof terminal kit ∅100-150 Adaptor F/F ∅150 L=200 with seal Bend 45° M/F ∅150 with seal Pipe M/F ∅150 L=140 with seal Bend 90° F/F ∅100 with seal Condensate tee with drain point Pipe M/F ∅100 L=250 w
