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Alpha CD50S Installation And Servicing Instructions

Wall mounted, fan assisted, gas fired, high efficiency condensing system boilers
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Installation and Servicing

Instructions
Alpha CD50S and 70S
Wall Mounted, Fan Assisted, Gas Fired, High Efficiency
Condensing System Boilers
For Technical help or for Service call ...
ALPHA HELPLINE
Tel: 0870 3001964
Nepicar House, London Road,
Wrotham Heath, Sevenoaks,
Kent TN15 7RS
0051
For use with Natural Gas or Propane Gas (LPG)
Leave these instructions with the User

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  • Page 1: Installation And Servicing

    Installation and Servicing Instructions Alpha CD50S and 70S Wall Mounted, Fan Assisted, Gas Fired, High Efficiency Condensing System Boilers For Technical help or for Service call ... ALPHA HELPLINE Tel: 0870 3001964 Nepicar House, London Road, Wrotham Heath, Sevenoaks, Kent TN15 7RS...

  • Page 2: Table Of Contents

    Routine servicing ....... 24 INTRODUCTION The Alpha CD50S and 70S are wall mounted high efficiency condensing, fan assisted system boilers. The burner is lit electronically and the heat output is controlled by a modulating fan and gas valve. These are system boilers providing heating only for sealed central heating systems. However, they may be used with an open central heating system if required - refer to Section 3.8.

  • Page 3: Technical Data

    82°C Pressure Relief Valve Setting 4 bar (58.8 PSI) Flow Connection 1½" BSP Return Connection 1½" BSP Relief Valve Connection ¾" BSP Recommended System Pressure (cold) 1.0 bar CH Water Temp. (Approx. max.) 82°C (180°F) Alpha CD50S/70S - Technical Data...
  • Page 4 63 kg CD70S 68 kg PERFORMANCE DATA content (± 0.2%) Sedbuk rating Boiler model Natural Gas (LPG) Propane Gas Efficiency NOx class CH Max CH Max band CD50S 9.25 9.30 10.1 10.6 CD70S 9.00 9.25 10.5 Alpha CD50S/70S - Technical Data...
  • Page 5 M O R H F E T S K V U Y Z 230/240 V ~ 50 Hz only Maximum 24 V connection only Note: Do not connect 230/240 V ~ 50 Hz Fig. 2 Alpha CD50S/70S - Technical Data...
  • Page 6 Gas valve Overheat thermostat Air inlet pipe Ignition electrodes Burner Injector Venturi positive point (P1) Flame sensing electrode Venturi Combustion chamber cover Automatic air vent Heat exchanger Pump Flue overheat thermostat Fig. 3 - CD50S Alpha CD50S/70S - Technical Data...
  • Page 7 Primary return temperature sensor Overheat thermostat Injector Burner Air inlet pipe Flame sensing electrode Ignition electrodes Venturi Combustion chamber cover Venturi positive point (P1) Hear exchanger Pump Flue overheat thermostat Condensate trap Fig. 4 - CD70S Alpha CD50S/70S - Technical Data...

  • Page 8: General Boiler Information

    Propane Gas (LPG): The Alpha CD50S boiler requires a gas rate of 3.94 kg/h (8.4 lb/h) or 7.6 litres/h of liquid gas. The Alpha CD70S boiler requires a gas rate of 5.42 kg/h (11.6 lb/h) or 10.4 litres/h of liquid gas.
  • Page 9 Alpha CD50S and CD70S boilers leave the factory with 'B23' type flue configuration (open chamber and forced draught - single flue pipe). To change the configuration to 'C' type (sealed chamber and forced draught - concentric flue pipe), remove the 80 mm dia.
  • Page 10 Open flue: 80 mm dia. single pipe Hmax = 27.4 m Concentric flue: 80/125 mm dia. Hmax = 18 m Concentric flue: 80/125 mm dia. Hmax = 15.2 m Fig. 7 - Vertical flues Alpha CD50S/70S - General Boiler Information...
  • Page 11 A terminal must not be sited below 2.1 m where people have access to, such as public footpaths, access routes, patios etc. However, If the terminal is fitted less than 2.1 m above a surface where there is no public access, the terminal must be protected by a terminal guard. A suitable guard is available from Alpha Therm Ltd. Boundary Fig.
  • Page 12 In this mode it is advisable to include a safety limit thermostat set at 55°C in series with the boiler circulating pump. The thermostat must be positioned in the system flow pipe at more than 2 metres from the boiler. Alpha CD50S/70S - General Boiler Information...
  • Page 13 3.10 FLUSHING THE HEATING SYSTEM It is essential that the central heating system is thoroughly cleaned and flushed when fitting an Alpha CD50S or CD70S boiler. Failure to do so will invalidate the warranty. If this is difficult because the system is old/dirty refer to Section 3.8, Fig.
  • Page 14 3.11 DISPOSAL OF CONDENSATE Provision must be made for the safe disposal of condensate produced by the flue gases of the Alpha CD50S or CD70S boilers and reference should be made to BS 6798: 2000 for the requirements on the disposal of condensate.

  • Page 15: Installation

    MINIMUM BOTTOM CLEARANCE 250 mm WITHOUT HYDRAULIC OPTIONAL KIT FOR USE WITH ALPHA CD50 - 70S Always grip the boiler firmly, and before lifting feel where the weight is Fig. 15 concentrated to establish the centre of gravity, repositioning yourself as necessary.
  • Page 16 Note: To prevent condensate lying in the flue pipe, slope the pipe towards the boilers with a minimum slope of 2.5° - 3° (25 - 30 mm per metre). When installing the extensions, a wall/ceiling mounted clamp must be installed every 1.5 metres. Alpha CD50S/70S - Installation...
  • Page 17 136 mm 13820 mm 180 mm Inner seal 200 mm Outer seal Note: Ensure the flue slopes downwards towards the boiler by a minimum of 25 to 30 mm per metre (2.5° - 3°) Fig. 22 Alpha CD50S/70S - Installation...
  • Page 18 Ensure that there is sufficient free cable to allow the control panel to be raised and lowered then tighten the cable clamp screws. Leave the control panel open until commissioning procedures have been completed. Carry out electrical system checks - Short circuit, Polarity, Earth continuity and Resistance to earth with a suitable multimeter. Alpha CD50S/70S - Installation...

  • Page 19: Commissioning

    Set the On/Off switch to ON. The boiler will now run in the central heating mode. The pump will start, the fan will start and the main gas valve solenoid will open allowing the main burner to light. Alpha CD50S/70S - Commissioning...
  • Page 20 1 = enabled 2 = disabled + continuous pump 3 = enabled + continuous pump Max. heating flow temperature 20°C 85°C 85°C * Only active with hot water function enabled when external accessories are fitted. Table 4 Alpha CD50S/70S - Commissioning...
  • Page 21 3 = enabled + continuous pump Central heating functioning mode 0 = disabled 1 = enabled 2 = disabled + continuous pump 3 = enabled + continuous pump Max, central heating flow temperature 20°C 85°C 85°C Table 6 Alpha CD50S/70S - Installation...
  • Page 22 00 = instantaneous with probe 01 = instantaneous no probe 02 = Boiler with probe 03 = Boiler without probe Manual fan speed 1 = Off 100% PWM signal level for pump Not active Table 7 Alpha CD50S/70S - Installation...
  • Page 23 Note: It is a requirement that the installation is registered by the installer through the CORGI Gas Work Notification Scheme. 12. Leave these Installation and Servicing instructions with the User for use on future calls. Alpha CD50S/70S - Commissioning...

  • Page 24: Routine Servicing

    Remove the two fixing screws (item 1) (one each side at the bottom) securing the case front panel. Pull the bottom of the panel outwards while pushing up at the same time and remove the panel Alpha CD12S/20S/28S - Routine Servicing...
  • Page 25 Remove the pressure tube. Disconnect the electrode lead from the ignition generator and the in-line connector to the flame sensing electrode. Remove the six nuts and washers securing the combustion chamber front assembly and remove the assembly. Alpha CD12S/20S/28S - Routine Servicing...
  • Page 26 Automatic air vent Combustion chamber front cover Pump Venturi housing Condensate trap Condensing heat exchanger Gas valve Test points (air A) - (flue F) Safety valve 4 bar Flue hood Tundish Primary return NTC Fig. 26 CD50S Alpha CD12S/20S/28S - Routine Servicing...
  • Page 27 Test points (air A) - (flue F) Ignition electrode Automatic air vent Primary flow NTC Combustion chamber front cover Primary return NTC Overheat thermostat Venturi housing Ignition sensor Venturi Transformer Injector Pump Gas valve Condensate trap Fig. 27 CD70S Alpha CD12S/20S/28S - Routine Servicing...
  • Page 28 5.4. Place the case or front case panel in position and secure in position with the screws previously removed, see Section 6.2. Check the operation of the boiler. Return all controls to their original settings. Alpha CD50S/70S - Routine Servicing...

  • Page 29: Wiring Diagram

    NOTE: to apply an external room thermostat, connect it to the terminals F & E removing the link. Brown Black Blue Orange Green/Yellow White Grey Purple Flame sensing Ignition electrodes electrode W/Bl White/Blue W/Br White/Brown Transformer Fig. 29 Alpha CD50S/70S - Wiring Diagram...

  • Page 30: Fault Finding

    RESET button on the boiler control panel (see Fig. 24). This example of an automatic reset fault means that the temperature difference between the 6 30 system flow and return is more than 40°C. The boiler will automatically reset when the anomaly disappears. Alpha CD50S/70S - Fault Finding...

  • Page 31: Short Parts List

    Pipe, gas valve to burner manifold - CD50S 1.018784 Pipe, gas valve to burner manifold - CD70S 1.024264 LH side panel 2.012075 RH side panel 2.012074 Flow/return adapter 1 1/2" 3.019369 Tundish 1.018870 Pipe, tundish adapter 1.011654 Alpha CD50S/70S - Short Parts List...

  • Page 32: 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 CD50S/70S - Benchmark Checklist...

  • Page 33: 11 Service Record

    Engineers Name ................. Company Name ................Company Name ................Telephone No................Telephone No................CORGI ID card serial No............CORGI ID card serial No............Comments ................... Comments ..........................................................Signature ..................Signature ..................Alpha CD50S/70S - Service Record...
  • Page 36 These instructions have been carefully prepared but we reserve the right to Nepicar House, London Road, Wrotham Heath, alter the specification at any time in the interest of product improvement. Sevenoaks, Kent TN15 7RS © Alpha Therm Limited 2008. Tel: 0870 3001964 email: info@alphatherm.co.uk website:www.alpha-innovation.co.uk Part No.

This manual is also suitable for:

Cd70s

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