INSTALLATION & SERVICING INSTRUCTIONS INSTALLATION & SERVICING INSTRUCTIONS WM15/30 BFa, WM30/40 BF, WM40/50 BF From Serial No. Wall Mounted Domestic Gas Fired Boiler, Natural Draught Balanced Flue LEAVE THESE INSTRUCTIONS ADJACENT TO THE GAS METER. Page 0 Page 0a MYSON ECONOMIST WM15/30 BFa, WM30/40 BF, WM40/50 BF INSTALLATION AND SERVICING INDEX SECTION 1.0 2.0 3.0 4.0 SUBJECT TECHNICAL DATA SAFETY RANGE RATING BOILER LOCATION http://www.partsarena.
INSTALLATION & SERVICING INSTRUCTIONS 5.0 6.0 7.0 8.0 9.0 10.0 11.0 WATER SYSTEM INSTALLATION PROCEDURE INITIAL LIGHTING COMMISSIONING SERVICING FAULT FINDING SHORT LIST OF SPARE PARTS 10 16 18 19 21 27 31 Page 1 IT IS THE LAW THAT THIS APPLIANCE BE INSTALLED BY BRITISH GAS OR ANOTHER CORGI REGISTERED INSTALLER. INTRODUCTION This Installation Manual is applicable to the following models from the Potterton Myson Economist range of gas boilers: WM15/30 BFa G.C. No. 41.838.90 WM30/40 BF G.C. No. 41.
INSTALLATION & SERVICING INSTRUCTIONS 1.0 TECHNICAL DATA RATINGS WM15/30 BFa MAXIMUM MID RANGE MINIMUM 8.8 6.6 4.4 30,000 22,500 15,000 11.0 8.4 5.6 37,500 28,500 19,200 BURNER PRESSURE mbar 11.8 6.8 3.3 in wg 4.7 2.7 1.3 GAS RATE m3/h 1.0 0.8 0.5 ft3/h 36.0 28.0 19.0 MAXIMUM MID RANGE MINIMUM 11.7 10.3 8.8 40,000 35,000 30,000 14.7 13.0 11.3 50,000 44,300 38,500 BURNER PRESSURE mbar 14.6 11.7 8.8 in wg 5.9 4.7 3.5 GAS RATE m3/h 1.4 1.2 1.
INSTALLATION & SERVICING INSTRUCTIONS WM40/50 BF 3.30 0.130 330 OVERALL DIMENSIONS HEIGHT WIDTH DEPTH MODEL mm In mm In mm In WM 15/30 BFa 600 23 5/8 327 12 7/8 300 11 3/4 WM30/40 BF 650 25 5/8 361 14 1/4 300 11 3/4 WM40/50 BF 650 25 5/8 407 16 300 11 3/4 Page 3 WEIGHTS MODEL TOTAL WEIGHT LIFT WEIGHT kg Ib kg Ib WM15/30 BFa 25 56 16 35 WM30/40 BF 31 68 21 46 WM40/50 BF 35 78 23 50 WATER CAPACITIES MODEL litre pint WM15/30 BFa 0.7 1.
INSTALLATION & SERVICING INSTRUCTIONS BYPASS DIAMETER 15mm diameter. GAS CONNECTION Rc 1/2 (1/2 in BSP int) WATER CONNECTION Flow 22mm compression fitting LH side. Return 22mm compression fitting RH side. ELECTRICITY SUPPLY 240V-50Hz, fused at 3A. MINIMUM STATIC HEAD 0.2m (8in) MAXIMUM STATIC HEAD 30.
INSTALLATION & SERVICING INSTRUCTIONS DIMENSION FOR INSTALLATION, mm (See Fig. 1) MODEL A B C D E F G H J K L M N P WM15/30 BFa 327 600 300 252 45 255 500 100 128 287 282 568 323 225 WM30/40 BF 361 650 300 286 45 255 550 100 128 287 316 618 373 259 WM40/50 BF 407 650 300 332 45 255 550 100 128 332 362 618 328 305 TERMINAL GUARDS REFERENCE TYPE MODEL TOWER FLUE QUINNELL BARRETT WM15/30 BFa A E WM30/40 BF A E WM40/50 BF D M3 Page 5 http://www.partsarena.
INSTALLATION & SERVICING INSTRUCTIONS Fig. 1 Dimensions http://www.partsarena.com/baxi/System/DATA/Dx/DS1/installation/2102/I01-2102/I01-2102.
INSTALLATION & SERVICING INSTRUCTIONS Fig. 2 Balanced Flue Terminal Positions Fig. 3 Resistance to Water Flow through Boiler Page 6 2.0 SAFETY It is essential that the boiler is installed in accordance with this manual. It is the law that the installation be carried out by British Gas or another CORGI Registered Installer. 2.
INSTALLATION & SERVICING INSTRUCTIONS BS5440 Part 1, 1990 ; BS5440 Part 2, 1989; BS5449 1990; BS5546 1990; BS6798 1987; BS6891 1988; 2.2 Gas Supply Installation pipes should be fitted, tested for soundness and purged in accordance with BS6891, 1988. Pipework from the meter to the boiler should be of a size to ensure an adequate supply of gas, as set down in BS6891, 1988.
INSTALLATION & SERVICING INSTRUCTIONS NOTE: The boilers are factory set to give the maximum heat output. 4.0 BOILER LOCATION The appliances are not suitable for external installation. The boiler may be installed in any room, although particular attention is drawn to the requirements of current IEE regulations and, in Scotland, the electrical provisions of the Building Standards applicable in Scotland, with respect to the installation of a boiler in a room containing a bath or shower.
INSTALLATION & SERVICING INSTRUCTIONS Page 8 4.3 Positioning of Balanced Flue Terminal The boiler is supplied with a standard flue suitable for wall thicknesses from 230mm (9in) to 355mm (14in). The boiler terminal must be installed such that it is exposed to external air which has a free passage across it at all times, so that combustion products can disperse freely. In certain weather conditions the terminal may steam, and positions where this could cause a nuisance should be avoided.
INSTALLATION & SERVICING INSTRUCTIONS J K L From opening in a car port eg door, window into dwelling Vertically from a terminal on the same wall Horizontally from a terminal on the same wall 1200mm 1500mm 300mm Additional notes for car ports and other single storey "add-on" extensions: Any car port or other add-on extension should consist of a roof, or a roof and one other wall. If it consists of a roof and two other walls the installation shall be treated as suspect and further advice sought.
INSTALLATION & SERVICING INSTRUCTIONS Bypass The flow through the boiler must not be allowed to fall below the figure shown in the Technical Data Section. Therefore a bypass of at least the diameter shown in the Technical Data Section, should be fitted across the boiler. The total length of the bypass loop should be at least 3m. It is acceptable to use a radiator that cannot be shut off or adjusted by the customer as the bypass.
INSTALLATION & SERVICING INSTRUCTIONS Some Water Authorities require a stop cock in the cold feed pipe, in which case, a combined feed and vent cannot be used. A close coupled feed and vent should then be used, taking note of the vent lengths required to prevent pump surges causing either pumping over or air to be drawn in. The vent must be at least 22mm diameter and the feed at least 15mm diameter. There must be no valves or restrictions between the boiler and the outlet of the vent with any system.
INSTALLATION & SERVICING INSTRUCTIONS Fig. 4 Fully Pumped Open System - Combined Feed and Vent. (Some water authorities require a stop cock in the cold-feed pipe, in which case this system cannot be used). http://www.partsarena.com/baxi/System/DATA/Dx/DS1/installation/2102/I01-2102/I01-2102.
INSTALLATION & SERVICING INSTRUCTIONS Fig. 5 Fully Pumped Open System - Myson Aerjec. (Improves air removal from system). Page 12 http://www.partsarena.com/baxi/System/DATA/Dx/DS1/installation/2102/I01-2102/I01-2102.
INSTALLATION & SERVICING INSTRUCTIONS Fig. 6 Fully Pumped Open System - Close Coupled Feed and Vent MODEL WM 15/30 BFa WM 30/40 BF WM 40/50 BF VENT A 230 330 420 LENGTH B 260 290 330 A - Length Of Dry Vent B - Length of Water Filled Vent Vent lengths do not need to be vertical http://www.partsarena.com/baxi/System/DATA/Dx/DS1/installation/2102/I01-2102/I01-2102.
INSTALLATION & SERVICING INSTRUCTIONS Fig. 7 Fully Pumped Sealed System Piping Diagram. Page 13 CHARGE PRESSURE (BAR) 0.5 1.0 Pre-pressurisation pressure (bar) 0.5 1.0 1.5 1.0 Expansion vessel volume (litre) Ax 0.066 Ax 0.112 Ax 0.207 Ax 0.087 1.5 1.5 1.5 A x 0.152 A x 0.
INSTALLATION & SERVICING INSTRUCTIONS The cylinder should be either an indirect type or a direct type fitted with an immersion calorifier that is suitable for the system pressure. The cylinder should be to the requirements of BS1566, Part 1, 1984. Single feed (self priming) indirect cylinders must not be used on a sealed system.
INSTALLATION & SERVICING INSTRUCTIONS Fig. 8 Control Box Wiring Schematic. b - blue br - brown gy - grey g/y- green/yellow o - orange r - red w - white http://www.partsarena.com/baxi/System/DATA/Dx/DS1/installation/2102/I01-2102/I01-2102.
INSTALLATION & SERVICING INSTRUCTIONS Fig. 9 Function Flow Diagram. Page 15 6.0 INSTALLATION PROCEDURE Unpack the boiler. Remove control cover from base of boiler by sliding forward. Remove the main casing locating screws (see Figure 13). Remove casing by pulling forward. Remove the boiler chassis from the wallplate by removing two wing nuts (B, Figure 10) and disengaging from the lower mounting brackets. Using the wallplate as a template, mark the position of the hole for the air duct.
INSTALLATION & SERVICING INSTRUCTIONS a layer of sealant to seal between the boiler and the wallplate. Lift the boiler and pass the ductwork through the hole in the wall. Engage the bottom of the boiler on the lower mounting brackets and secure the top of the boiler with the two wing nuts (B, Figure 10). From outside the building, insert the outer flue duct/flue terminal into the wall opening, and slide it into the inner flue duct. Mark the positions of the two flue terminal fixing holes (D, Figure 11).
INSTALLATION & SERVICING INSTRUCTIONS The connection PUMP is for the pump live, N and 3 3 are neutral and earth connections for the pump if required. The cable(s) to the external controls and pump should be clamped using the bushes provided. Allow 150mm (6in) of slack in all cables to facilitate servicing.
INSTALLATION & SERVICING INSTRUCTIONS Fig. 11 Flue Duct /Terminal Assembly. . Fig. 12 View of Gas Controls http://www.partsarena.com/baxi/System/DATA/Dx/DS1/installation/2102/I01-2102/I01-2102.
INSTALLATION & SERVICING INSTRUCTIONS Page 17 7.0 INITIAL LIGHTING See Figure 12 a Check that the electricity supply and gas service cock are OFF. b Remove the screw from the gas control valve inlet pressure test point. c Turn on the gas supply and open the gas service cock to purge air from the appliance supply pipe. d Replace the gas control valve inlet pressure test point screw and allow the purged gas to disperse.
INSTALLATION & SERVICING INSTRUCTIONS that the boiler is factory preset to give its maximum heat output. m Adjust the burner gas pressure to the figures shown in the Technical Data Section. The pressure adjustment screw location is shown on Figure 12 . After removal of the plastic plug, turn the screw anticlockwise to increase the pressure, and clockwise to decrease the pressure. Check that the flames are not yellow tipping or lifting off.
INSTALLATION & SERVICING INSTRUCTIONS opened to increase the flow rate through the boiler until the noise stops. NOTE: When the boiler is first fired, a smell may occur. This will clear within a few hours of operation. NOTE: A limit thermostat is fitted to the boiler, wired to interrupt the thermocouple circuit, and so causing safety shut down in the event of an overheat condition. This limit thermostat is of a selfresetting type.
INSTALLATION & SERVICING INSTRUCTIONS Fig. 13 Internal Layout of Boiler. http://www.partsarena.com/baxi/System/DATA/Dx/DS1/installation/2102/I01-2102/I01-2102.
INSTALLATION & SERVICING INSTRUCTIONS Fig. 14 Details of Pilot Assembly. Fig. 1 5 Location of Thermostat Phial. Page 20 9.0 SERVICING This section describes the annual servicing procedure, and gives instructions for the replacement of faulty parts. Servicing must be carried out by a competent person at least once a year. WARNING: ALWAYS TURN OFF THE GAS SUPPLY AT THE INLET SERVICE COCK, AND SWITCH OFF AND DISCONNECT THE ELECTRICITY SUPPLY TO THE APPLIANCE, BEFORE COMMENCING SERVICING. 9.
INSTALLATION & SERVICING INSTRUCTIONS 9.1.1 Removal of Outer Casing (see Figure 13) Remove the control cover by pulling forward. Remove the main casing locating screws. Gently pull casing forward to remove. On replacement, check that the clips for the thermostat capillary are not dislodged. 9.1.2 Removal of Combustion Chamber Door ( see Figure 13) a Remove the split pin from the thermostat phial pocket. Remove the fixing screws for the thermostat pocket cover, leaving the cover on the capillary.
INSTALLATION & SERVICING INSTRUCTIONS If the electrode is damaged, replace (see Section 9.2) 9.1.7 Inspect the Heat Exchanger a Inspect the heat exchanger for deposits. If these are evident, remove the attic fixing screw, and remove the attic by pulling forward. Remove the two attic insulation pieces. b Remove the two combustion chamber side insulation retaining brackets (see Figure 13) by pulling forward, remove the two side insulation pieces by easing down, then forward.
INSTALLATION & SERVICING INSTRUCTIONS Page 22 9.2 Replacement of Parts (see Figure 13) Please quote Boiler Serial No. when ordering spare parts. WARNING: ALWAYS TURN OFF THE GAS SUPPLY AT THE INLET SERVICE COCK, AND SWITCH OFF AND DISCONNECT THE ELECTRICITY SUPPLY, BEFORE WORKING ON THE APPLIANCE. It will be necessary to remove the outer casing (see Section 9.1.1) before replacing any of the following parts. After servicing, always check for gas soundness and for functional operation. 9.2.
INSTALLATION & SERVICING INSTRUCTIONS a Remove combustion chamber door ( see Section 9.1.2). b Unscrew the thermocouple and electrode nuts at the base of the pilot assembly. c Disconnect the electrode lead and remove the electrode. d Reassemble in reverse order (see Section 9.1.8). Check that the electrode gap is 3-4mm (see Figure 14). 9.2.4 Replacement of Pilot Assembly and Pilot Injector) a Remove combustion chamber door ( see Section 9.1.2). b Remove pilot assembly and pilot injector (see Section 9.1.
INSTALLATION & SERVICING INSTRUCTIONS g Unscrew the union nut of the inlet service cock. h Remove lead from piezo generator. Remove three screws from the piezo generator bracket. i Remove two screws securing the injector manifold to the base of the boiler, remove injector manifold and gas control valve. j Turn gas control valve anti-clockwise to unscrew it from the injector manifold, remove gas inlet pipe from gas control valve. k Reassemble in reverse order (see Section 9.1.8).
INSTALLATION & SERVICING INSTRUCTIONS c Remove the two thermostat sensor mounting screws from the boiler flow pipe. d Disconnect the limit thermostat leads from the adaptors on the gas control valve. e Remove the grommet from the top of the boiler, remove limit thermostat and leads. f Reassemble in reverse order. 9.2.8 Replacement of Piezo Generator a Detach electrode lead from rear of piezo generator. b Remove piezo generator mounting nut, remove generator from bracket. c Reassemble in reverse order. 9.2.
INSTALLATION & SERVICING INSTRUCTIONS a Remove combustion chamber door ( see Section 9.1.2). b Lift the front insulation pieces to clear the bottom retaining brackets. Remove by pulling slightly forward at the top to clear the door edge and lifting the insulation. c Remove the two side insulation retaining brackets by pulling forward, remove the side insulation pieces by easing down then forward. d Remove the attic fixing screw and remove the attic by pulling forward.
INSTALLATION & SERVICING INSTRUCTIONS Page 27 10.2 Pilot does not stay alight when gas control knob is released http://www.partsarena.com/baxi/System/DATA/Dx/DS1/installation/2102/I01-2102/I01-2102.
INSTALLATION & SERVICING INSTRUCTIONS Page 28 http://www.partsarena.com/baxi/System/DATA/Dx/DS1/installation/2102/I01-2102/I01-2102.
INSTALLATION & SERVICING INSTRUCTIONS 10.3 Pilot lit, main burner will not light Page 29 10.4 Boiler shut down by limit thermostat http://www.partsarena.com/baxi/System/DATA/Dx/DS1/installation/2102/I01-2102/I01-2102.
INSTALLATION & SERVICING INSTRUCTIONS http://www.partsarena.com/baxi/System/DATA/Dx/DS1/installation/2102/I01-2102/I01-2102.
INSTALLATION & SERVICING INSTRUCTIONS Page 30 11.0 SHORT LIST OF SPARE PARTS WM1 5/30 BFa, WM30/40 BF, WM40/50 BF KEY NO. BGC PART NO. ITEM 1 1 1 MAKERS PART NO. 68/2515/01 68/2515/06 68/2021/02 1 68/0033/01 1 68/0033/02 323-892 3.0mm diameter Injector WM40/50 BF 1 68/0033/03 382-495 3.
INSTALLATION & SERVICING INSTRUCTIONS 118 397-833 Pump Overrun Boiler Thermostat Type 2, Ranco C77 1 Page 31 Page 32 Page 32a http://www.partsarena.com/baxi/System/DATA/Dx/DS1/installation/2102/I01-2102/I01-2102.
INSTALLATION & SERVICING INSTRUCTIONS http://www.partsarena.com/baxi/System/DATA/Dx/DS1/installation/2102/I01-2102/I01-2102.
INSTALLATION & SERVICING INSTRUCTIONS Page 33 http://www.partsarena.com/baxi/System/DATA/Dx/DS1/installation/2102/I01-2102/I01-2102.
