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A.O. Smith BFM 30 manual

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Table of contents for the manual

  • Page 1

    BFM 30 BFM 50 BFM 80 MODELS INST ALLA TION INSTRUCTIONS AND USERS MANUAL UNITED KINGDOM CLOSED COMBUSTION W A TER HEA TER[...]

  • Page 2

    2 INTRODUCTION Read the installation instructions before installing the water heater. Read the user-instructions before lighting the water heater. If these instructions are not followed carefully, this may lead to explosion and/or fire and can cause material damages and/or physical harm. Installation and commissioning should be carried out by a reg[...]

  • Page 3

    3 CONTENTS PAGE 1 . GENERAL 1.1 Water heater description .................................................................................................... ................. 5 1.2 Technical safety equipment .................................................................................................. .............. 6 1.2.1 Gas control .......[...]

  • Page 4

    4 Figure 1 1 ) TOP-BOX 9 ) VENTILATION FAN 2 ) AIR PROVING SWITCH 10 ) ANODE 3 ) TEMPERATURE REGULATOR 1 1) FLUE TUBES ON/OFF SWITCH 12 ) FLUE BAFFLE RESET-KNOB 13 ) DIAPHRAGM 4 ) BURNER CONTROLLER 14 ) INSULATION 5 ) GAS VALVE 1 5 ) BURNER 6 ) MANIFOLD / INJECTORS 16 ) AIR DIFFUSION PLATE 7 ) PILOT BURNER 17 ) CONDENSATE DRAIN 8 ) HORIZONTAL AIR I[...]

  • Page 5

    5 1. GENERAL 1.1 Description of the appliance Construction and fitting out of the storage appliance comply with the European Standard for gas fired hot water storage appliances for sanitary use (EN89). The appliance thereby satisfies the requirements of the European Directive for Gas Appliances, and is therefore entitled to bear the CE mark. The BF[...]

  • Page 6

    6 1.2 Technical safety equipment 1.2.1 Gas control The water heaters are equipped with a gas control valve which regulates the flow of gas to the burner. The combination gas control is equipped with a safety valve, gas control valve, pilot safety valve and burner control (on a standard natural gas setting) 1.2.2 Control box For safety purposes, wat[...]

  • Page 7

    7 Figure 3 - Differential pressure switch Figure 2 - Positioning ventilation[...]

  • Page 8

    8 1. 3 Technical description 1.3.1 Measurements See figure 4 All dimensions in mm, rounded up to the nearest 5 mm. Size BFM 30 BFM 50 BFM 80 A 1995 1995 2020 B 1795 1795 1820 C 600 600 600 D 520 520 525 E 600 600 590 F 1640 1640 1655 G 1360 1360 1360 H 630 630 625 K 710 710 710 L 1000 1000 1000 M 755 755 755 N 80/125 100/150 130/200 1 Cold water in[...]

  • Page 9

    9 Figure 4 I MD- 0057 -R0[...]

  • Page 10

    10 Description Unit BFM 30 BFM 50 BFM 80 DATA NATURAL GAS G 20 Nominal gas inlet pressure mbar 20 20 20 Burner pressure mbar 12.5 12.5 12.5 Input k W 2 9 4 7 7 5 Output to water kW 2 7 4 2 6 8 Gas consumption* m3/h 3. 0 4 .7 7. 9 Diameter main injector m m 2.60 2.50 2.70 Diameter injector ignition burner m m 0.56 / 0.41 0.56 / 0.41 0.56 / 0.41 Heat[...]

  • Page 11

    11 I MD- 0065 2 . FOR THE INSTALLER If possible, use a trolley or fork-lift truck to move the water heater. Always move the water heater in an upright position. 2. 1 Installation instructions The following distances should be observed: - Sides of the water heater: 100 cm (free space for the accessibility of the hand holes) - Rear of the water heate[...]

  • Page 12

    12 I MD- 0066 -R0 Depending on the length and insulation of the water piping and the water demand frequency, it may be necessary to install a circulation system on the drain cock. The return pipe of the circulation piping can be fitted on the top of the drain cock after the sealing plug has been removed (see figure 6). Unvented To install an A.O. S[...]

  • Page 13

    13 I MD- 0059 Depending on the water demand pattern (e.g., small amounts frequently), it may be necessary to circulate the water in the water heater to prevent temperature stratification. Therefore, we recommend that a circulation system is installed in the event of such demand patterns (see figure 8). Kits are available from A.O. Smith or our dist[...]

  • Page 14

    14 Flue configuration / horizonal discharge BFM-unit Measurement BFM 30 BFM 50 BFM 80 min. max. min. max. min. max. A 0 7000 0 7000 0 7000 B 0 7000 0 7000 0 7000 A +B < 7000 < 7000 < 7000 All measurements are in mm. The following applies for the horizontal pipe: slope of at least 5 mm per metre of pipe to the water heater. NB. Measurements[...]

  • Page 15

    15 I MD- 0061 I MD-00 62 Figure 10 and 11 - Roof discharge. All measurements are in mm. The following applies for the horizontal pipe: slope of at least 5 mm per metre of pipe to the water heater. A maximum of 2 bends (45° or 90°) may be used with Flue configurations roof discharge BFM-unit Measurement BFM 30 BFM 50 BFM 80 min. max. min. max. min[...]

  • Page 16

    16 2.1.6 Electrical connection All electrical connections must be carried out by a registered electrical contractor to the relevant regulations. The BFM must be connected to a supply voltage by means of a permanent electric connection and have a feeder cable not less than 3 x 1,0 mm². Supply voltage Supply network Mínimum fuse frequency required [...]

  • Page 17

    17 Figure 12 - Electrical connection diagram BFM I MD 0055 R1[...]

  • Page 18

    18 Figure 13 - Connection diagram control-column. D) Transformer 230 E) Air proving switch F) EMC single phase filter G ) RESET knob H) Thermostat frost K) Thermostat regulation L ) Switch ON/OFF M ) Thermostat overheat N) Thermostat high limit P) Automatic burner controller R) Relay X ) Plastic connector strip Y ) Earth terminal block I MD- 0063[...]

  • Page 19

    19 2. 2 Turning the water heater on 2.2.1 Filling the water heater 1. Assemble the drain-off tap and check that it is closed. 2. Open the cold water tap to the water heater and open a l l taps on hot water outlet points to vent them. The heater is filled as soon as cold water pours out of all outlet points. 3. Close all taps at hot water draining p[...]

  • Page 20

    20 Figure 14 - Checking the gas pressures 2. 5 Checking the gas pressures The nominal load has been set at the correct value in the factory. A further check of the pressure should be carried out during the commissioning of the unit. A dangerous situation can occur if the following instructions are not followed carefully. Setting the nominal load is[...]

  • Page 21

    21 2. 6 Conversion to another gas Important: Install a gas valve suitable for the type of gas to be used. If the water heater has to function on a gas category (LP or natural gas) other than the gas set as standard (ex works), the water heater must be converted to the applicable gas category with the associated conversion kit(s). Only an accredited[...]

  • Page 22

    22 2 . 7 Maintenance The water heater must be checked and cleaned regularly (at least once a year) by an accredited installer, so that proper operation is guaranteed. The bar burners, control and safety valves must also be checked. (see figure 17). 2.8 Anode The life of the anode is determined by the quality and the quantity of water flowing throug[...]

  • Page 23

    23 2.10 Condensation If the water heater has been filled with cold water or if the hot water usage has been very high, normally condensation of the flue gasses will occur on the cold sides of the combustion chamber and the flue tubes. The water drops will fall on to the burner bed which can cause a hissing sound. This is normal and will disappear a[...]

  • Page 24

    24 3 . FOR THE USER 3.1. Instructions for use Installation and commissioning of the water heater should only be undertaken by a registered installer. 3.1.2 Filling the water heater 1. Assemble the drain-off tap and ensure it is closed; 2. Open the cold water tap to the water heater and open a l l taps on hot water drain-off points to vent them. The[...]

  • Page 25

    25 No or insufficient hot water. Check whether the electricity is turned on. Check whether the gas supply is turned on. Does the ON/OFF switch light up? Does the RESET switch light up? Push RESET switch up to three times Is the water heater in operation? Consult your installer. 4 . FAULT FINDING 4. 1 Fault finding USER Problem solved no yes yes yes[...]

  • Page 26

    26 4. 2 Fault finding INSTALLER Check if ON/OFF switch is in position 1 ? Put ON/OFF switch in position 1 . Problem solved yes Is the water heater in operation? Problem solved yes Is the water heater in operation? Problem solved yes Is the water heater in operation? yes no no no no no yes See detailed fault finding no Does the ON/OFF switch light u[...]

  • Page 27

    27 4. 3 Detailed fault finding INSTALLER no Check voltage present at connection 1 . Reinstate voltage supply no Ensure connections correct, if yes replace FILTER Ensure connections correct, if yes replace ON/OFF switch Check voltage present after FILTER Check voltage present at gate 3 ON/OFF switch Check voltage present at gate 11 and 12 CONTROL TH[...]

  • Page 28

    28 Ensure connections correct, if yes replace MAXIMUM THERMOSTAT Check voltage present at GATE 12 MAXIMUM THERMOSTAT? Check voltage present at GATE 1 BURNER AUTOMATION S4560D 1150? Check voltage present at GATE 8 BURNER AUTOMATION Is VENTILATING FAN in operation? Check voltage present at GATE 7, BURNER AUTOMATION Check voltage present at GATE 3 AIR[...]

  • Page 29

    29 yes yes yes yes yes yes yes yes no no no no no no no Check voltage present at GATE 12 ECO Check voltage present at GATE 11 BURNER AUTOMATION Pressure H higher then 300 PA? Pressure L less then 0 PA ? Check voltage present at GATE 2 BURNER AUTOMATION Does the RESET switch light up? Check voltage present at GATE 10 BURNER AUTOMATION Ensure connect[...]

  • Page 30

    30 Re-instate gas supply and reset water heater Water heater in in operation? Gas supply present? Problem solved IONISATION PROBLEMS. Carry out 3 RESET cycles to make sure the pilot is provided with gas. Check gasconnections towards the pilot burner. Carry out one more RESET cycle. If no operation is valid replace the entire PILOT BURNER assy. RESE[...]

  • Page 31

    31 5 . WARRANTY The following conditions form the guarantee agreement between A.O. Smith Water Products Company (the warrantor) and the owner of the water heater. 5. 1 Guarantee in general If within one year of the original installation date of the water heater any part or component other than the tank shall prove upon examination by the warrantor [...]

  • Page 32

    32 0305 664 R0[...]