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1.0 Introduction

© Baxi Heating UK Ltd 2012

1.1

Description

1. The Baxi Neta-tec Combi GA Range are fully automatic gas
fired wall mounted condensing combination boilers. They are
room sealed and fan assisted, and will serve central heating and
mains fed domestic hot water.

2. The boiler is set to give a maximum output of :-

24 models - 24 kW DHW

21.2 kW CH (Condensing)

28 models - 28 kW DHW

25.3 kW CH (Condensing)

33 models - 33 kW DHW

29.6 kW CH (Condensing)

3. The boiler is factory set for use on Natural Gas (G20). It can
be adapted to operate on Propane (G31) - see Section 10.1
‘Gas Type Check’.

4. The boiler is suitable for use only on fully pumped sealed
heating systems. Priority is given to domestic hot water.

5. The boiler data badge gives details of the model, serial
number and Gas Council number and is situated on the
control box. It is visible when the case front panel is removed
(Fig. 2).

6. The boiler model, serial number and Gas Council number
are also shown on the information label behind the boiler
control flap (Fig. 1). This is for user reference.

7. The boiler is intended to be installed in residential /
commercial / light industrial E.M.C. environments on a
governed meter supply only.

8. The boiler must be installed with one of the purpose
designed flues such as one of the standard horizontal
telescopic flue kits detailed in the Flue Installation Guide .

9.

All systems must be thoroughly cleansed, flushed and

treated with inhibitor (see section 6.2).

1.2

Optional Extras

Various timers, external controls, etc. are available as optional
extras. Full details are contained in the relevant sales literature.

1.3

Contents of Pack

The pack contains:-

• Boiler
• Wall Plate (including taps)
• Template
• Fittings & Literature Pack

NOTE

: These Installation & Servicing Instructions MUST be

read in conjunction with the Flue Installation Guide
supplied in the Literature Pack.

Fig. 1

Control Flap

Fig. 2

Information Label

Data Badge

Gas Type Label

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Содержание Neta-tec Combi 24 GA

Страница 1: ... Wall Mounted Condensing Combination Boiler Installation Servicing Instructions These instructions include the Benchmark Commissioning Checklist and should be left with the user for safe keeping They must be read in conjunction with the Flue Installation Guide ...

Страница 2: ...ode of Practice which is available from the Heating and Hotwater Industry Council who manage and promote the Scheme Visit www centralheating co uk for more information 0086 ISO 9001 FM 00866 Building Regulations and the Benchmark Commissioning Checklist Building Regulations England Wales require notification of the installation of a heating appliance to the relevant Local Authority Building Contro...

Страница 3: ...elevant LABC You must ensure that the certificate number issued by the Gas Safe Register is written onto the Benchmark Checklist Scheme Members only Call Gas Safe Register on 0800 408 5577 or log onto www gassaferegister co uk within 10 days If you notify via the Gas Safe Register the register will issue the Building Regulations certificate on members behalf Complete the Benchmark Checklist Instal...

Страница 4: ...E the installation must be carried out by a competent Person and installed in accordance with the current edition of I S 813 Domestic Gas Installations the current Building Regulations and reference should be made to the current ETCI rules for electrical installation All systems must be thoroughly flushed and treated with inhibitor see section 6 2 The boiler meets the requirements of Statutory Ins...

Страница 5: ...s clear and unobstructed If possible avoid steps wet or slippery surfaces unlit areas etc and take special care on ladders into lofts Technique When handling or lifting always use safe techniques keep your back straight bend your knees Don t twist move your feet avoid bending forwards and sideways and keep the load as close to your body as possible Where possible transport the boiler using a sack ...

Страница 6: ...stem Details 12 7 0 Site Requirements 15 8 0 Flue Options 21 9 0 Installation 23 10 0 Commissioning 28 11 0 Completion System Draining 30 12 0 Servicing 31 13 0 Changing Components 33 14 0 Combustion Calibration 42 15 0 Electrical 43 16 0 Short Parts List 44 17 0 Fault Finding Service Due 45 18 0 Optional Outdoor Sensors 51 Benchmark Checklist 54 Section Page ...

Страница 7: ...nt panel is removed Fig 2 6 The boiler model serial number and Gas Council number are also shown on the information label behind the boiler control flap Fig 1 This is for user reference 7 The boiler is intended to be installed in residential commercial light industrial E M C environments on a governed meter supply only 8 The boiler must be installed with one of the purpose designed flues such as o...

Страница 8: ... 7 Fan Assembly 8 Exp Vessel Locating Stud 9 Flame Sensing Electrode 10 Air Gas Collector 11 Spark Ignition Electrode 12 Combustion Box Cover Burner 13 Control Box Display 14 Condensate Trap 15 Safety Pressure Relief Valve 16 Gas Valve 17 Diverter Valve Motor 18 Boiler Control 19 Optional Timer 20 Boiler Drain Tap 21 Heating Flow Sensor 22 Safety Thermostat 1 2 3 4 5 6 7 9 8 10 11 12 13 14 15 19 1...

Страница 9: ...as there is power to the boiler as indicated by the standby signal 2 With CH DHW or CH only selected when the boiler temperature falls below 5 C the boiler will fire until a temperature of 30 C is reached 3 If DHW only is selected when the boiler CH temperature falls below 5 C the boiler will fire until a temperature of 30 C is reached When the boiler DHW temperature falls below 5 C the boiler wil...

Страница 10: ...nce Electrical Protection IPX5D Internal Fuse Rating F2L Inlet Pressure Natural Gas G20 mbar 20 Injector 24 model mm 4 4 28 model mm 4 6 33 model mm 4 9 Condensate Drain To accept 21 5mm 3 4 in plastic waste pipe External Fuse Rating 3A Heat Input CH Net Max Min 24 model kW 20 3 5 28 model kW 24 3 9 33 model kW 28 4 8 Heat Output CH Non Condensing Max Min 24 model kW 20 3 4 28 model kW 24 3 8 33 m...

Страница 11: ...22mm Cold Water Inlet 15mm Heating Return 22mm Pressure Relief Valve 15mm Condensate Drain 40 mm 25 mm 65 mm 65 mm 65 mm 65 mm 65 mm 162 5 mm Boiler Side Boiler Side Tap Rail Dimensions A 700mm B 300mm This can be reduced to 290mm by removing the boiler control access flap C 390mm D 116mm Ø Min E 160mm 207mm for 80 125mm flue systems F 130mm G 106mm H 228mm J 162mm ...

Страница 12: ... of a proprietary cleanser such as Sentinel X300 or X400 or Fernox F3 and an inhibitor such as Sentinel X100 or Fernox MB 1 3 Full instructions are supplied with the products for further information contact Sentinel 0800 389 4670 or Fernox 0870 870 0362 Failure to flush and add inhibitor to the system will invalidate the appliance warranty 4 It is important to check the inhibitor concentration aft...

Страница 13: ...sure is 0 5 bar The vessel is suitable for correct operation for system capacities up to 125 litres 24 28 or 155 litres 33 40 For greater system capacities an additional expansion vessel must be fitted For GB refer to BS 7074 Pt 1 For IE the current edition of I S 813 Domestic Gas Installations 6 7 Safety Pressure Relief Valve Fig 6 1 The pressure relief valve is set at 3 bar therefore all pipewor...

Страница 14: ...en a suitable expansion device may be required 5 The boiler s maximum working mains pressure is 8 bar therefore all pipework connections fittings etc should be suitable for pressures in excess of 8 bar A pressure reducing valve must be fitted for pressures in excess of 8 bar The manufacturer of any outlet fittings such as a shower valve may require a lower maximum pressure The pressure reduction m...

Страница 15: ...Gas Installations and the current ETCI rules 4 If the boiler is to be fitted into a building of timber frame construction then reference must be made to the current edition of Institute of Gas Engineers Publication IGE UP 7 Gas Installations in Timber Framed Housing 7 2 Clearances Figs 8 9 1 A flat vertical area is required for the installation of the boiler 2 These dimensions include the necessar...

Страница 16: ...current edition of ETCI rules 2 The mains supply is 230V 50Hz fused at 3A NOTE The method of connection to the electricity supply must facilitate complete electrical isolation of the appliance Connection may be via a fused double pole isolator with a contact separation of at least 3mm in all poles and servicing the boiler and system controls only 7 6 Bath Shower Rooms 1 If the boiler is fitted in ...

Страница 17: ...diameter and must be supported using suitably spaced clips of the correct design to prevent sagging 6 It is advisable that the full length of condensate pipe is run internally and preferably be less than 3 metres 7 Internal runs greater than 3 metres or runs in cold areas should use 32mm waste pipe 8 External runs MUST be a MINIMUM of 32mm and fully insulated with material suitable for external us...

Страница 18: ... emptied then back pressure may force water out of the boiler trap and cause appliance lockout Boiler 2 5 Minimum fall iii Termination to a drain or gully Boiler 500mm min 2 5 Minimum fall iv Termination to a purpose made soakaway Holes in the soak away must face away from the building 50mm per metre of pipe run 50mm per metre of pipe run Further specific requirements for soakaway design are refer...

Страница 19: ...ce Heating Element is NOT a substitute for correct installation of the condensate drain ALL requirements in this section must still be adhered to Boiler vi pumped into an external soil vent pipe 2 5 Minimum fall 50mm per metre of pipe run Condensate Pump Unheated Location e g Garage Basement or similar heated Boiler 2 5 Minimum fall 50mm per metre of pipe run Pipe must terminate above water level ...

Страница 20: ...ow Opening Window or Door 150mm MIN IMPORTANT If fitting a Plume Displacement Flue Kit the air inlet must be a minimum of 150mm from any opening windows or doors see Fig 13 Plume Displacement Kit Air Inlet Fig 13 Terminal Position with Minimum Distance Fig 12 mm A1 Directly below an opening air brick opening windows etc 300 B1 Above an opening air brick opening window etc 300 C1 Horizontally to an...

Страница 21: ...ximum permissible equivalent flue lengths are 60 100 80 125 Horizontal Concentric 10 metres 20 metres 4 Any additional in line bends in the flue system must be taken into consideration Their equivalent lengths are Concentric Pipes 135 bend 0 5 metres 93 bend 1 0 metres 5 The elbow supplied with the standard horizontal telescopic flue kit is not included in any equivalent length calculations NOTE F...

Страница 22: ...ation 8 4 Terminal Guard Fig 15 1 When codes of practice dictate the use of terminal guards Multifit accessory part no 720627901 can be used Note This is not compatible with Flue Deflector referred to below 2 If a proprietary guard is used it must be identified as suitable for use with condensing boilers 3 There must be a clearance of at least 50mm between any part of the terminal and the guard 4 ...

Страница 23: ...inimum diameter 116mm 7 Drill the wall as previously marked to accept the wall plugs supplied Secure the wall plate using the fixing screws 8 Using a spirit level ensure that the plate is level before finally tightening the screws 9 Connect the gas and water pipes to the valves on the wall plate using the copper tails supplied Ensure that the sealing washers are fitted between the connections 10 F...

Страница 24: ...he valve The discharge pipe must be installed before pressurising the system 3 The pipework must be at least 15mm diameter and run continuously downwards to a discharge point outside the building See section 6 7 for further details 4 Utilising one of the sealing washers connect the discharge pipe to the adaptor and tighten the nut hand tight plus 1 4 turn to seal 5 Complete the discharge pipework ...

Страница 25: ...om the flue elbow to the outside face of the wall X in Fig 25 is less than 250mm the Connection Assembly can be discarded and the Terminal Assembly fitted directly into the elbow 6 In instances where the dimension X Fig 25 is between 250mm and 315mm it will be necessary to shorten the Terminal Assembly by careful cutting to accommodate walls of these thicknesses 7 To dimension X add 40mm This dime...

Страница 26: ...elbow with the screws supplied Fig 30 IMPORTANT It is essential that the flue terminal is fitted as shown to ensure correct boiler operation and prevent water entering the flue 13 Make good between the wall and air duct outside the building appropriate to the wall construction and fire rating 14 If necessary fit a terminal guard see Section 8 4 Slots at bottom Fig 30 Fig 31 Adaptor Apply the lubri...

Страница 27: ...ck in the cables to allow the Control Box to be hinged fully open Tighten the gland nut and refit the grommet 5 Connect the Earth Permanent Live and Neutral wires to the terminal strip NOTE Both the Permanent Live and Neutral connections are fused 6 Refer to the instructions supplied with the external control s IMPORTANT Any thermostat MUST be suitable for 230V switching 7 Remove the link between ...

Страница 28: ...ler pump will run for up to 10 minutes during which time the diverter valve will switch between heating hot water This will purge air from the system The display will show Gas Type Check 11 Once de aeration is complete the boiler will go automatically to first fire up and run at the Ignition Phase fan speed for 3 or 4 minutes to check the gas type N G or Propane L P G The boiler software checks th...

Страница 29: ... model 1 92 kg h 28 model 2 25 kg h 33 model 2 64 kg h 5 Press together and hold for at least 6 seconds to exit the function 6 Carefully read and complete all sections of the Benchmark Commissioning Checklist at the rear of this publication that are relevant to the boiler and installation These details will be required in the event of any warranty work The publication must be handed to the user fo...

Страница 30: ...ation of the boiler 11 2 System Draining 1 If at any time after installation it is necessary to drain the central heating system e g after replacing a radiator the De Aeration Function should be activated 2 On refilling the system ensure that there is no heating or hot water demand but that there is power to the boiler 3 Press together and hold for at least 6 seconds The De Aeration Function will ...

Страница 31: ...e with the analyser manufacturers requirements Competence can be demonstrated by satisfactory completion of the CPA1 ACS assessment which covers the use of electronic portable combustion gas analysers in accordance with BS 7967 Parts 1 to 4 Check the Combustion Performance CO CO2 ratio 4 Set the boiler to operate at maximum rate as described in Section 14 1 1 to 14 1 6 5 Remove the plug from the f...

Страница 32: ...ny evidence of leaks or corrosion and if found determine rectify the cause 12 Reassemble in reverse order ensuring the front case panel is securely fitted DHW Filter Fig 48 13 If the flow of domestic hot water is diminished it may be necessary to clean the filter 14 Turn the DHW isolation cock Fig 47 off and draw off from a hot tap 15 Remove the retaining clip and extract the filter cartridge and ...

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