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You can rely on
Installation & Service Instructions Promax Combi
HE Plus A
Range
Condensing
Combination Boiler
These instructions include the Benchmark Commissioning
Checklist and should be left with the user for safe keeping.
© Baxi Heating UK Ltd 2011
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Natural Gas Building Regulations and the Benchmark Commissioning Checklist Potterton Promax Combi 24 HE Plus A o G.C.N 47 393 21 Building Regulations (England & Wales) require notification of Potterton Promax Combi 28 HE Plus A o the installation of a heating appliance to the relevant Local G.C.N 47 393 22 Potterton Promax Combi 33 HE Plus A Authority Building Control Department. From 1 April 2005 this o G.C.N 47 393 23 can be achieved via a Competent Persons Self Certification Scheme as an opti
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Installer Notification Guidelines Choose Building Regulations Notification Route Competent Person's Building Control Self Certification Scheme Install and Commission this Contact your relevant Local appliance to manufacturer's Authority Building Control instructions (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 Install and Commission thi
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Legislation IMPORTANT - Installation, Commissioning, Service & Repair This company declare that no substances harmful to health are contained in the appliance or used during appliance This appliance must be installed in accordance with the manufacturer’s instructions and manufacture. the regulations in force. Read the instructions fully before installing or using the appliance. The appliance is suitable only for installation in GB and IE and should be installed in accordance with the rules in fo
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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. The boiler should be handl
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CONTENTS Section 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 19 9.0 Plume Displacement 24 10.0 Installation 28 11.0 Commissioning 33 12.0 Completion 35 13.0 Servicing 36 14.0 Changing Components 38 15.0 Setting the Gas Valve 47 16.0 Electrical 48 17.0 Short Parts List 49 18.0 Fault Finding 50 19.0 Pages for Notes 56 Benchmark Checklist 58 6 © Baxi Heating
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1.0 Introduction 1.1 Description 1. The Potterton Promax Combi HE Plus A is a fully automatic gas fired wall mounted condensing combination boiler. It is room sealed and fan assisted, and will serve central heating and Case Front Panel mains fed domestic hot water. 2. The boiler is set to give a maximum output of :- 24 models - 24 kW DHW 21 kW CH (Condensing) 28 models - 28 kW DHW 25.9 kW CH (Condensing) 33 models - 33 kW DHW 30.3 kW CH (Condensing) 3. It is designed for use on Natural Gas (G20)
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2.0 General Layout 2.1 Layout 23 1. Expansion Vessel 1 15 2. Automatic Air Vent 3. DHW Plate Heat Exchanger / Automatic Bypass 22 4. Circulation Pump 5. Drain Off Point 14 6. Pressure Relief Valve 7. Optional Integral Timer Position 13 8. Central Heating System Pressure Gauge 21 9. PCB 16 10. Control Box 11. 3-Way Valve Assembly 20 12. Condensate Trap 13. Flame Sensing Electrode 14. Spark Electrode 15. Primary Heat Exchanger 16. Fan Assembly 17. On/Off/Reset Selector Switch 18. Central Heating T
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3.0 Appliance Operation 1 Central Heating Circuit 3.1 Central Heating Mode (Fig. 2) 27 1. With a demand for heating, the pump circulates water through the primary circuit. 2 2. Once main burner ignites the fan speed controls the gas rate to maintain the heating temperature measured by the 3 4 7 temperature sensor. 26 20 5 6 3. When the flow temperature exceeds the setting temperat
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4.0 Technical Data 4.1 Promax Combi 24, 28 & 33 Appliance Type C C C 13 33 53 NO Class 5 Inlet Pressure (Natural Gas - G20) x mbar 20 Appliance Category CAT I 2H Central Heating Primary Circuit Pressures Injector (Natural Gas - G20) Heat Input CH (Net) Max Min bar 7.5mm (24&28 model) 12mm(33 model) 24 model kW 20.5 7 Safety Discharge 3 Electrical Supply 230V~ 50H z Max Operating 2.5 28 model kW 24.7 9 (Appliance must be connected to an Min Operating 0.5 33 model kW 28.9 9.7 earthed supply) R
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5.0 Dimensions and Fixings Dimensions A 780mm E At Least 1.5° G B 345mm C 450mm D 116mm Ø Min. A E 185mm (207mm for 80/125mm flue systems) F 145mm G 131mm B H 180mm 360° Orientation H D C Tube Ø 100mm F Tap Rail 32.5 mm Condensate Drain 65 mm 65 mm 65 mm 65 mm 65 mm Heating Heating Domestic Hot Gas Cold Water Pressure Relief Return Flow Water Outlet Inlet Inlet Valve (22mm) (22mm) (15mm) (22mm) (15mm) (15mm) 11 © Baxi Heating UK Ltd 2011
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6.0 System Details 6.1 Information 1. The Promax Combi 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
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6.0 System Details 6.5 System Filling and Pressurising (Fig. 4) 1. A filling point connection on the central heating return Double Stop Stop Check pipework must be provided to facilitate initial filling and Valve Valve Valve pressurising and also any subsequent water loss replacement/refilling. 2. There are connection points on the mains cold water inlet and central heating return isolating taps (Fig. 5) to which the Temporary DHW CH optional filling loop kit (Part No. 248221) can be assembled
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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 2. Your attention is drawn to: for GB: Guidance G17 to G24 and recommendation R17 to Boiler Expansion R24 of the Water Regulations Guide. Vessel* for IE: the current edition of I.S. 813 “Domestic Gas Installations”. 3. The Water Regulations recommendations for England and Check Wales proh
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7.0 Site Requirements 5mm Min 450mm 5mm Min 7.1 Location 1. The boiler may be fitted to any suitable wall with the flue 200mm Min passing through an outside wall or roof and discharging to (300mm Min if using 80/125mm atmosphere in a position permitting satisfactory removal of flueing system) 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. (The boiler may be fit
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7.0 Site Requirement Gas Service Cock 7.3 Ventilation of Compartments 1. Where the appliance is installed in a cupboard or compartment, no air vents are required. 2. BS 5440: Part 2 refers to room sealed appliances installed in compartments. The appliance will run sufficiently cool without ventilation. 7.4 Gas Supply 1. The gas installation should be in accordance with the relevant standards. In GB this is BS 6891. In IE this is the current edition of I.S. 813 “Domestic Gas Installations”. Fig.
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50mm per metre of pipe run 2.5° Minimum fall 50mm per metre of pipe run 2.5° Minimum fall 50mm per metre of pipe run 2.5° Minimum fall 50mm per metre of pipe run 2.5° Minimum fall 7.0 Site Requirements 7.7 Condensate Drain Termination to an internal soil and Boiler vent pipe FAILURE TO INSTALL THE CONDENSATE DISCHARGE PIPEWORK CORRECTLY WILL AFFECT THE RELIABLE OPERATION OF THE BOILER The condensate discharge pipe MUST NOT RISE at any point along its length. There MUST be a fall of AT LEAST 2.5°
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Terminal Position with Minimum Distance (Fig. 18) (mm) 1 A Directly below an opening, air brick, opening 7.0 Site Requirements windows, etc. 300 1 B Above an opening, air brick, opening window etc. 300 1 C Horizontally to an opening, air brick, opening window etc. 300 7.8 Flue 2 D Below gutters, soil pipes or drain pipes. 25 2 E Below eaves. 25 NOTE: Due to the nature of the boiler a plume of water 2 F Below balconies or car port roof. 25 vapour will be discharged from the flue. This should be 2
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8.0 Flue Options 8.1 Horizontal Flue Systems 1. The standard flue is suitable only for horizontal termination applications. 2. All fittings should be fully engaged. The approximate engagement is 40mm. Apply soap solution to the seal on (ii) each fitting to aid assembly. (i) 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. Their equivalent lengths
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Vertical 8.0 Flue Options Flues 8.2 Twin & Vertical Flue Systems (ii) 1. Maximum permissible equivalent flue lengths are:- (60/100) (80/125) Vertical Concentric 10 metres 20 metres Vertical Twin Pipe 15 metres (i) 2. 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 IMPORTANT: All flue systems must be securely Twin Flue Pipe supported at least once every metre. Suitable pi
