Installation & Servicing Instructions Neta-tec Combi GA Range Gas Fired Wall Mounted Condensing Combination Boiler 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.
Model Range Baxi Neta-tec Combi 24 GA G.C.No 47-075-51 Baxi Neta-tec Combi 28 GA G.C.No 47-075-52 Baxi Neta-tec Combi 33 GA G.C.No 47-075-53 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 Control Department. This can be achieved via a Competent Persons Self Certification Scheme as an option to notifying the Local Authority directly.
Installer Notification Guidelines Choose Building Regulations Notification Route Competent Person's Self Certification Scheme Building Control Install and Commission this appliance to manufacturer's instructions Contact your relevant Local Authority Building Control (LABC) who will arrange an inspection or contact a government approved inspector Complete the Benchmark Checklist If you notify via the ‘Gas Safe Register’, the register will issue the Building Regulations certificate on members’ behalf
Legislation IMPORTANT - Installation, Commissioning, Service & Repair This appliance must be installed in accordance with the manufacturer’s instructions and the regulations in force. Read the instructions fully before installing or using the appliance. In GB, this must be carried out by a competent person as stated in the Gas Safety (Installation & Use) Regulations.
Safe Manual Handling General The following advice should be adhered to, from when first handling the boiler to the final stages of installation, and also during maintenance. Most injuries as a result of inappropriate handling and lifting are to the back, but all other parts of the body are vulnerable, particularly shoulders, arms and hands. Health & Safety is the responsibility of EVERYONE. There is no ‘safe’ limit for one man - each person has different capabilities.
CONTENTS Section 6 © Baxi Heating UK Ltd 2014 Page 1.0 Introduction 7 2.0 General Layout 8 3.0 Appliance Operation 9 4.0 Technical Data 10 5.0 Dimensions and Fixings 11 6.0 System Details 12 7.0 Site Requirements 15 8.0 Flue Options 20 9.0 Installation 22 10.0 Commissioning 27 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.
1.0 Introduction 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) Information Label 3.
2.0 General Layout 2.1 2 3 Layout 8 1 12 11 10 9 7 13 15 17 1. Expansion Vessel 2. Boiler Adaptor 3. Primary Heat Exchanger 4. DHW Plate Heat Exchanger 5. Pump with Automatic Air Vent 6. Central Heating System Pressure Gauge 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.
Boiler Schematic Layout 19 3.0 Appliance Operation 3.1 20 18 1. With a demand for heating, the pump circulates water through the primary circuit. 21 2. Once the burner ignites the fan speed controls the gas rate to maintain the heating temperature measured by the temperature sensor. 22 3. When the flow temperature exceeds the setting temperature, a 3 minute delay occurs before the burner relights automatically (anti-cycling). The pump continues to run during this period. 23 24 4.
4.0 Technical Data 4.1 Appliance Type C13 C33 C43 C53 Appliance Category CAT II 2H 3P Heat Input CH (Net) 24 model kW 28 model kW 33 model kW Max 20 24 28 Heat Output CH (Non-Condensing) Max 24 model kW 20 28 model kW 24 33 model kW 28 Heat Output CH (Condensing) Max 24 model kW 21.2 28 model kW 25.3 33 model kW 29.6 Heat Input DHW (Net) 24 model kW 28 model kW 33 model kW Max 24.7 28.9 34 Heat Output DHW 24 model kW 28 model kW 33 model kW Max 24 28 33 Injector 24 model 28 model 33 model 4.4 4.
5.0 Dimensions and Fixings Dimensions At least 1.5° E G A 700mm B 300mm* *This can be reduced to 290mm by removing the boiler control access flap C 390mm A D 116mm Ø Min.
6.0 System Details 6.1 Information 1. The Baxi Neta-tec Combi GA Condensing Combination Boiler is a ‘Water Byelaws Scheme - Approved Product’. To comply with the Water Byelaws your attention is drawn to the following installation requirements and notes (IRN). a) IRN 001 See text of entry for installation requirements and notes. b) IRN 302 Byelaw 14. 2. Reference to the WRc publications, ‘Water fittings and materials directory’ and ‘Water supply byelaws guide’ give full details of byelaws and the IRNs. 6.
6.0 System Details 6.5 Stop Valve Double Check Valve System Filling and Pressurising 1. A filling point connection on the central heating return pipework must be provided to facilitate initial filling and pressurising and also any subsequent water loss replacement/refilling. Stop Valve 2. A filling loop is supplied with the boiler. Follow the instructions provided with it. DHW Mains Inlet Temporary Loop CH Return 3.
6.0 System Details 6.8 Domestic Hot Water Circuit (Fig. 7) 1. All DHW circuits, connections, fittings, etc. should be fully in accordance with relevant standards and water supply regulations. Other Tap Outlets Expansion Vessel* Boiler Check Valve* Pressure Reducer Valve* To Hot Taps Stop Tap *See 6.8 for instances when these items may be required Fig.
390mm 5mm Min 7.0 Site Requirements 5mm Min 7.1 175mm Min (300mm Min if using 80/125mm flueing system) Location 1. The boiler may be fitted to any suitable wall with the flue passing through an outside wall or roof and discharging to atmosphere in a position permitting satisfactory removal of combustion products and providing an adequate air supply. The boiler should be fitted within the building unless otherwise protected by a suitable enclosure i.e. garage or outhouse.
7.0 Site Requirement 7.4 Gas Supply 1. The gas installation should be in accordance with the relevant standards. In GB this is BS 6891 (NG) or BS 5482 Pt. 1 (LPG). In IE this is the current edition of I.S. 813 “Domestic Gas Installations”. 2. The connection to the appliance is a 22mm copper tail located at the rear of the gas service cock (Fig. 10). 3.
Examples are shown of the following methods of termination:i) to an internal soil & vent pipe ii) via an internal discharge branch (e.g. sink waste) downstream of the trap iii) to a drain or gully iv) to a purpose made soakaway v) pumped into an internal discharge branch (e.g. sink waste) downstream of the trap vi) pumped into an external soil & vent pipe vii) to a drain or gully with extended external run & trace heating It is strongly recommended to discharge internally into the household drainage system.
v) pumped into an internal discharge branch (e.g. sink waste) downstream of the trap Sink 50mm 7.0 Site Requirements per me tre of p ipe run 2.5° M inimum fall Pipe must terminate above water level but below surrounding surface. Cut end at 45° 7.7 Condensate Drain (cont.) 12. A boiler discharge pump is available, ‘MULTIFIT’ part no. 720648301. This pump will dispose of both condensate & high temperature water from the relief valve. It has a maximum head of 5 metres.
Terminal Position with Minimum Distance (Fig. 12) (mm) A1 Directly below an opening, air brick, opening windows, etc. B1 Above an opening, air brick, opening window etc. C1 Horizontally to an opening, air brick, opening window etc. D2 Below gutters, soil pipes or drain pipes. E2 Below eaves. F2 Below balconies or car port roof. G2 From a vertical drain pipe or soil pipe. H2 From an internal or external corner. I Above ground, roof or balcony level. J From a surface or boundary line facing a terminal.
8.0 Flue Options 8.1 Horizontal Flue Systems 1. The standard flue is suitable only for horizontal termination applications. (ii) (i) 2. All fittings should be fully engaged. The approximate engagement is 40mm. Apply the lubricant supplied to the seal on each fitting to aid assembly. 3. Maximum 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.
8.0 Flue Options 8.2 m 0m 50 The standard horizontal telescopic flue kit allows for lengths between 315mm and 500mm from elbow to terminal without the need for cutting (Fig. 14). Extensions of 250mm, 500mm & 1m are available. m 5m 31 Flue Lengths Flue Deflector Fig.
9.0 Installation 9.1 Unpacking & Initial Preparation IMPORTANT RISK ASSESSMENT - Before commencing the installation it is recommended that the ‘Five Steps to Risk Assessment’ document published by the HSE is consulted, and an assessment performed as described. GAS SUPPLY - The gas supply, gas type and pressure must be checked for suitability before connection (see Section 7.4). NOTE: a small amount of water may drain from the boiler in the upright position.
Boiler Mounting Bracket 9.0 Installation 9.3 Fitting The Boiler 1. Remove the sealing caps from the boiler connections. NOTE: A small amount of water may drain from the boiler once the caps are removed. Sealing Washers 2. Lift the boiler as indicated by the shaded areas. The boiler should be lifted by TWO PEOPLE. Engage the mounting bracket at the top rear of the boiler on the wall plate (Fig.21) (see Safe Manual Handling page 5). 3.
9.0 Installation m 0m 50 m 5m 31 9.6 Fitting The Flue HORIZONTAL TELESCOPIC FLUE Terminal Assembly 1. There are two telescopic sections, the Terminal Assembly and the Connection Assembly, a roll of sealing tape and two self tapping screws. A 93° elbow is also supplied. Fig. 24 2. The two sections can be adjusted to provide a length between 315mm and 500mm (Fig. 24) when measured from the flue elbow (there is 40mm engagement into the elbow). Connection Assembly Wall Thickness 3.
9.0 Installation Boiler Elbow Apply the lubricant supplied for ease of assembly (do not use any other type). 9.6 10. Remove the flue elbow and insert the flue through the hole in the wall. Fit the flue trims if required, and refit the elbow to the boiler adaptor, ensuring that it is pushed fully in (Fig. 29). Adaptor Ensure Elbow is fully engaged into Boiler Adaptor Fitting the Flue (Cont) 11. Draw the flue back through the wall and engage it in the elbow.
9.0 Installation 9.7 Making The Electrical Connections 1. See Section 7.5 for details of the electrical supply. Undo the securing screws and lift the case front panel off. 2. Disengage the securing tab and hinge the control box downwards. Undo the terminal block cover securing screw and remove the cover (Fig. 34). 3. Slacken the gland nut in the left of the boiler lower panel and pass the mains cable through it.
11.0 Commissioning 10.0 10.1 Cap Commissioning the Boiler 1. Reference should be made to BS:EN 12828, 12831 & 14336 when commissioning the boiler. Ensure that the trap has been primed - see Section 9.5 paragraph 3. Automatic Air Vent 2. At the time of commissioning, complete all relevant sections of the Benchmark Checklist at the rear of this publication. 3. Open the mains water supply to the boiler and all hot water taps to purge the DHW system. Fig. 37 4.
Set Boiler to Maximum Rate (see 10.3.1) Allow the combustion to stabilise. Do not insert probe to avoid ‘flooding’ the analyser. Verify Flue Integrity Indication that products of combustion & inlet air are mixing - further investigation is required. Check all flue components are correctly assembled, fixed & supported. Check the flue & terminal are unobstructed. Is O2 20.6% and CO2 < 0.2% ? No TURN APPLIANCE OFF ! Call 0844 871 1555 for advice.
10.0 Commissioning 10.3 Check the Operational (Working) Gas Inlet Pressure & Gas Rate Note: The system MUST be cold to ensure the boiler is operating under full demand. To obtain an accurate measurement on smaller capacity systems it may be necessary to open one or more hot taps in order to maintain the boiler at full rate 1. Press & together and hold for at least 6 seconds.
11.0 Completion & System Draining 11.1 Completion 1. Replace the case front panel, and secure with the screws previously removed. 2. This publication must be handed to the user for safe keeping and each subsequent regular service visit recorded. Case Front Panel 3. Set the central heating and hot water temperatures to the requirements of the user. Instruct the user in the operation of the boiler and system. 4. Instruct the user in the operation of the boiler controls.
Flue Sampling Point 12.0 Servicing 12.1 Performance Safety Check & Annual Servicing 1. For reasons of safety and economy, it is recommended that the boiler is serviced annually. Servicing must be performed by a competent person in accordance with B.S. 7967-4. Air Sampling Point 2. After servicing, complete the relevant Service Interval Record section of the Benchmark Commissioning Checklist at the rear of this publication.
