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Benchmark Alpha CD18S Installation And Servicing Instructions

Wall mounted, fan assisted, room sealed, gas fired, high efficiency condensing system boiler range
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Installation and Servicing

Alpha CD18S/24S/30S
Wall Mounted, Fan Assisted, Room Sealed, Gas Fired,
High Efficiency Condensing System Boiler Range
Instructions
For Technical help or for Service call ...
ALPHA HELPLINE
Tel: 0870 3001964
Nepicar House, London Road,
Wrotham Heath, Sevenoaks,
Kent TN15 7RS
*HEJEID/=I
Alpha CD18S
Alpha CD24S
Alpha CD30S
For use with Natural Gas only
Leave these instructions with the User
Service Listed
G.C. No. 41 532 06
G.C. No. 41 532 02
G.C. No. 41 532 08

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  • Page 1: Installation And Servicing

    Installation and Servicing Instructions Alpha CD18S/24S/30S Wall Mounted, Fan Assisted, Room Sealed, Gas Fired, High Efficiency Condensing System Boiler Range For Technical help or for Service call ... ALPHA HELPLINE Tel: 0870 3001964 Nepicar House, London Road, Wrotham Heath, Sevenoaks,...
  • Page 2 the nation’s favourite PLUMBING & HEATING SUPPLIES FREE SHIPPING SECURE PAYMENTS on all orders over £100 to mainland UK shop online with confidence FINANCE AVAILABLE PRICE MATCH spread the cost with low interest rates always get the best deals available we have H U G E R E D U C T I O N S...

  • Page 3: Table Of Contents

    13 Service record ........36 INTRODUCTION The Alpha CD18S, 24S and 30S are high efficiency condensing, wall mounted, fan assisted, room-sealed system boilers. The burner is lit electronically and the heat output is controlled by a modulating fan and gas valve.

  • Page 4: Technical Data

    15 mm External Fuse Recommended System Pressure (cold) 1.0 bar Power Consumption CD18/24 130 W CH Water Temp. (Approx. max.) 82°C (180°F) CD30 140 W Internal Fuse F2 A Electrode Spark Gap 3 - 4 mm Alpha CD18S/24S/30S - Technical Data...
  • Page 5 Ch1 OFF switched live to terminal 1 2. Only fit the Alpha recommended two channel clock is Ch2 ON 2 channel clock. Other clocks fitted could cause damage. Boiler terminal block Clock connections Fig. 1 Alpha CD18S/24S/30S - Technical Data...

  • Page 6: Boiler Schematic

    Cyclone separator Venturi Drain point Condensate trap Main burner Pressure relief valve Primary/condensing heat exchanger Primary pressure switch Room sealed chamber Ignition electrodes Flame sensing electrode Pressure differential test points Venturi negative point Fig. 2 Alpha CD18S/24S/30S - Technical Data...

  • Page 7: General Boiler Information

    GENERAL BOILER INFORMATION GAS SUPPLY The Alpha CD18S boiler requires a gas rate of 1.93 m³/h (68.2 ft³/h). The Alpha CD24S boiler requires a gas rate of 2.54 m³/h (89.7 ft³/h). The Alpha CD30S boiler requires a gas rate of 3.45 m³/h (121.8 ft³/h).
  • Page 8 L = B + E + F + 230 mm + (90° bend = 1.3 metre) L = B + C + 230 mm + (2 x 45° bends = 1.8 metre) VERTICAL FLUE OPTIONS Fig. 3 Alpha CD18S/24S/30S - General Boiler Information...
  • Page 9 The boiler may be installed in a cupboard or compartment, provided it is correctly designed for that purpose, i.e. complies with the Building Regulations and the requirements of BS 6798. Alpha CD18S/24S/30S - General Boiler Information...
  • Page 10 Heating circuit water Feed cistern to be Stop return Stop supply located above highest valve valve Stop point in the system Test cock valve Test cock Filling loop temporarily connected Fig. 6 Fig. 7 Alpha CD18S/24S/30S - General Boiler Information...
  • Page 11 Note: All pipework must have a continuous fall (see Figs. 8 and 9) from the boiler and must be of an acid resistant material such as plastic waste pipe. (copper or steel is not suitable). It should be noted that the connection of a condensate pipe to a drain may be subject to local building control requirements. Alpha CD18S/24S/30S - General Boiler Information...
  • Page 12 Fig. 8 - External gully Fig. 9 - External soakaway Alpha CD18S/24S/30S - General Boiler Information...

  • Page 13: Installation

    Using the screws supplied, fit the mounting Fig. 11 bracket. Top pipe connections - Preform the pipework at the back of the boiler before hanging the boiler, see Fig. 12, and secure in the clips provided. Alpha CD18S/24S/30S - Installation...
  • Page 14 Heating return C - Heating return (22 mm) valve D - Pressure relief valve (15 mm) Condensate E - Heating drain point trap F - Condensate discharge pipe G - Cyclone drain point 47.5 212.5 Fig. 13 Alpha CD18S/24S/30S - Installation...
  • Page 15 Note: Check the flue terminal protrudes 100 mm out of the wall and the inner duct of the terminal is positioned correctly (see Fig. 18). Make good the inside wall by pushing the inside flue sealing collar upto the wall. Alpha CD18S/24S/30S - Installation...
  • Page 16 Mark the end of the flue assembly 'TOP' where it is connected to the boiler,so that the 'TOP' of the flue terminal is aligned with the 'TOP' at the boiler end of the flue assembly. Pass the complete flue assembly through the wall. Alpha CD18S/24S/30S - Installation...
  • Page 17 The main terminal block can be removed by pulling it off the pins to give easy access to the terminals. Fig. 20 Do not switch on the electrical supply at this stage. Alpha CD18S/24S/30S - Installation...
  • Page 18 5, (or, as per the instructions supplied with the clock). Ensure wiring is correct. ii). Replace the clock cover. Do not overtighten the fixing screws. iii). Leave the control panel open until commissioning procedures have been completed. Fig. 21 Alpha CD18S/24S/30S - Installation...

  • Page 19: Commissioning

    COMMISSIONING When commissioning the boiler, ensure the Benchmark Checklist is completed. FILL THE SYSTEM The boiler is fitted with an automatic air vent positioned on the pump (see Fig. 2). The vent is always open and has no sealing cap.
  • Page 20 8.2). It is recommended that a label is attached to the boiler drawing attention to the fact that the system has been drained. Complete the details of the installation in the Benchmark Checklist on page 35. Alpha CD18S/24S/30S - Commissioning...
  • Page 21 Show the User the position of the pressure relief valve and condensate discharge pipes. 10. Hand the User's instructions to the User. 11. Ensure the Benchmark Checklist in Section 12 on page 35 has been completed after the boiler has been installed and commissioned.

  • Page 22: Boiler Operation

    A and B Flashing on and off alternately - System pressure is very low and re-pressurisation is required. A Flashing and B Illuminated continuously - Pump fault or restricted flow. Note: Do not hold the selector switch in the reset position (3) for more than 2 to 3 seconds. Alpha CD18S/24S/30S - Boiler Operation...

  • Page 23: Routine Servicing

    Six nuts and washers Gas pipe securing combustion union chamber front assembly Viewing window Room sealed panel fixing screws Pressure tube connections assembly Fan assembly fixing screws Ignition generator Condensate trap Fig. 25 Alpha CD18S/24S/30S - Routine Servicing...
  • Page 24 Place the front case panel in position as shown in Fig. 25 and secure in position. Raise the control panel and secure in position with the two screws provided. Check the operation of the boiler. (Refer to Boiler Operation, Section 6). Return all controls to their original settings. Alpha CD18S/24S/30S - Routine Servicing...

  • Page 25: Component Replacement

    Gain access behind the room sealed chamber panel as described in Section 8.1. Undo the gas inlet union to the combustion chamber front to gain access. Unscrew the damaged injector and screw in a replacement. Re-assemble in reverse order. Alpha CD18S/24S/30S - Component Replacement...
  • Page 26 Light the boiler and test for gas soundness. (Refer to Commissioning, Section 5.4) and the instructions supplied with the replacement valve for adjustment of the valve. 10. Complete re-assembly as described in Routine Servicing, Section 7.4 Fig. 28 paragraphs 5 to 9. Alpha CD18S/24S/30S - Component Replacement...
  • Page 27 Re-assemble in reverse order, ensuring that new seals are used. Lubricating the seals with the grease supplied will aid assembly. 10. Refill and pressurise the system. (Refer to Commissioning, Section 5.1). Alpha CD18S/24S/30S - Component Replacement...
  • Page 28 Unscrew the automatic air vent from the pump outlet. Fit a new one using a new 'O' ring. Refill and pressurise the system. (Refer to Commissioning, Section 5.1). Automatic air vent Pump Primary pressure switch Pressure relief valve Pressure gauge Fig. 31 Alpha CD18S/24S/30S - Component Replacement...
  • Page 29 Disconnect the top and drain connection of the condensate trap. Lift the trap out and re-assemble with a new condensate trap. Note: Before fitting the new trap, pour 100 cc of water into the trap. Alpha CD18S/24S/30S - Component Replacement...

  • Page 30: Wiring Diagrams

    WIRING DIAGRAMS ILLUSTRATED WIRING DIAGRAM Alpha CD18S/24S/30S - Wiring Diagrams...
  • Page 31 FUNCTIONAL FLOW WIRING DIAGRAM Alpha CD18S/24S/30S - Wiring Diagrams...

  • Page 32: Fault Finding

    Check that the gas and water pipework has been connected to the correct connections on the boiler and all valves are open. However, before any servicing or replacement of parts ensure the gas and electrical supplies are isolated. 10.2 CENTRAL HEATING - Follow operational sequence Alpha CD18S/24S/30S - Fault Finding...
  • Page 33 10.2 FAULT FINDING SOLUTIONS A to E Alpha CD18S/24S/30S - Fault Finding...
  • Page 34 10.3 FAULT FINDING SOLUTIONS F to K Alpha CD18S/24S/30S - Fault Finding...

  • Page 35: Short Parts List

    Fig. 28 Flame sensing electrode and lead - CD30 E96-572 1.019293 Fig. 2A,2B, item 26/27 By-pass assembly 3.012801 E65-498 Fig. 27 Combustion chamber insulation panel front E94-420 1.014732 Fig. 25 Condensate trap 1.011844 H01-874 Alpha CD18S/24S/30S - Short Parts List...

  • Page 36: Benchmark Checklist

    The operation of the appliance and system controls have been demonstrated to the customer The manufacturer's literature has been left with the customer COMMISSIONING ENG'S NAME: Print ..............CORGI ID No........... Sign ..............Date ..............Alpha CD18S/24S/30S - Service History...

  • Page 37: Service Record

    13 SERVICE RECORD It is recommended that your heating system is serviced regularly and that you complete the appropriate Service Interval Record below. Service Provider: Before cpmpleting the appropriate Service Interval Record below, please ensure you have carried out the service as described in this instruction manual.

This manual is also suitable for:

Alpha cd24sAlpha cd30s

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