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Andrews MAXXflo CWH30/200 Installation Manual, Operation And Maintenance Manual

High efficiency condensing stainless steel storage water heaters for natural gas and propane.
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This manual must be kept with the appliance
Part No. E281
MAXXflo
Installation guide, operation
and maintenance manual
High Efficiency Condensing
Stainless Steel Storage
Water Heaters for
Natural Gas and Propane
Natural Gas Models
CWH30/200, CWH30/300
CWH60/200, CWH60/300
CWH90/200, CWH90/300
CWH120/200, CWH120/300
Propane Models
LCWH30/200, LCWH30/300
LCWH60/200, LCWH60/300
LCWH90/200, LCWH90/300
LCWH120/200, LCWH120/300
Working towards
a cleaner future
August 2012

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Table of Contents

   Related Manuals for Andrews MAXXflo CWH30/200

   Summary of Contents for Andrews MAXXflo CWH30/200

  • Page 1 MAXXflo Installation guide, operation and maintenance manual High Efficiency Condensing Stainless Steel Storage Water Heaters for Natural Gas and Propane Natural Gas Models CWH30/200, CWH30/300 CWH60/200, CWH60/300 CWH90/200, CWH90/300 CWH120/200, CWH120/300 Propane Models LCWH30/200, LCWH30/300 LCWH60/200, LCWH60/300 LCWH90/200, LCWH90/300 LCWH120/200, LCWH120/300...
  • Page 2 The attention of UK users is drawn to their responsibilities under the Health and Safety Regulations 1993. All installation and service on Andrews Water Heaters must be carried out by properly qualified personnel and, therefore, no liability can be accepted for any damage or malfunction caused as a result of intervention by unauthorised personnel.
  • Page 3: Table Of Contents

    XXXXXXXXX • SECTION XX CONTENTS PAGE SECTION 1 GENERAL AND SAFETY INFORMATION General Information British Standards and Codes of Practice Health and Safety Regulations 1993 Legionellae in Water Heaters SECTION 2 TECHNICAL DETAILS Technical Details – CWH30/60/90/120 Heater Dimensions – 200 litre model Heater Dimensions –...
  • Page 4: General And Safety Information

    SECTION XX • XXXXXXXXX SECTION 1 • GENERAL AND SAFETY INFORMATION GENERAL AND SAFETY INFORMATION The Andrews Water Heater has been designed for use I/M2 Purging procedures for non-domestic gas with NATURAL GAS OR LPG and is manufactured to give installations.
  • Page 5: Legionellae In Water Heaters

    GENERAL AND SAFETY INFORMATION • SECTION 1 XXXXXXXXX • SECTION XX EFFECTIVENESS IN COMBATING LEGIONELLA Water systems in buildings have been associated with outbreaks of Legionnaires’ Disease, particularly in health care facilities where occupants are significantly more susceptible to infection. In recognition of the risks in hospitals, a Code of Practice for the Control of Legionella in Health Care premises has been issued by the Department of Health (1991).
  • Page 6 SECTION XX • XXXXXXXXX SECTION 2 • TECHNICAL DETAILS Model Reference CWH 30/200 60/200 90/200 120/200 30/300 60/300 90/300 120/300 Input gross Hs min/max 6.7–31.1 kW 13.4–62.2 kW 20.1–93.3 kW 26.8-124.4 kW Input nett Hi min/max 6.0–28.0 kW 12.0–56.0 kW 18.0-84.0 kW 24.0-112.0 kW Output (tank set point = 60°C) min/max...
  • Page 7: Heater Dimensions - 200 Litre Model

    TECHNICAL DETAILS XXXXXXXXX • SECTION XX • SECTION 2 INSPECTION HATCH INSPECTION HATCH...
  • Page 8: Heater Dimensions - 300 Litre Model

    SECTION XX • XXXXXXXXX SECTION 2 • TECHNICAL DETAILS INSPECTION HATCH INSPECTION HATCH...
  • Page 9: Technical Details

    TECHNICAL DETAILS XXXXXXXXX • SECTION XX • SECTION 2 INSTALLATION DESCRIPTION The location selected for installation of the heater must allow the provision of a satisfactory flue, adequate air The MAXXflo series is a direct fired condensing storage supply, drain facilities and must be well illuminated. water heater which has a stainless steel tank that is A purpose built water heater room or compartment is heated by up to four burner modules placed outside the...
  • Page 10: Water Quality And Treatment

    WATER QUALITY AND TREATMENT and a comparative pipe work system. The temperature and pressure relief valve(s) are factory fitted. FOR When installing Andrews Water Heaters in hard water SYSTEMS WITH LARGER PIPE VOLUMES OR areas we would recommend that a water treatment ADDITIONAL STORAGE, EXPANSION VESSELS WITH MORE CAPACITY ARE AVAILABLE.
  • Page 11: Condense Drain

    INSTALLATION • SECTION 3 XXXXXXXXX • SECTION XX CONDENSE DRAIN SECONDARY RETURN CIRCULATION PUMP Condensation is formed in the heater and this must be continuously discharged into a drain. A trap is supplied An additional connection for a secondary circulation is which should be connected into a drain via a tundish or available in the top of the heater that is located between air break.
  • Page 12: Typical Installations - Cwh30/60 & Cwh90/120

    SECTION XX • XXXXXXXXX SECTION 3 • INSTALLATION Fig 3A – Typical installation Fig 3B – Typical installation...
  • Page 13: Gas Supply - Natural Gas

    The meter and service pipe should be checked by British Gas or its authorised contractor to ensure that they are Andrews Water Heaters are unregulated and a second adequate to deal with the gas supply to the water stage regulator must be installed to give an inlet pressure...
  • Page 14: Typical Bulk Storage Vessel Installation

    SECTION XX • XXXXXXXXX SECTION 3 • INSTALLATION Fig 4: Typical Bulk Storage Vessel Installation Fig 5: Typical Cylinder Installation Important These drawings show a schematic representation only and should not be used for installation purposes. Contact your gas supplier for authorised installation drawings.
  • Page 15: Electrical Supply

    INSTALLATION • SECTION 3 XXXXXXXXX • SECTION XX ELECTRICAL SUPPLY ELECTRICAL CONNECTION External wiring to the water heater(s) must be installed in A terminal block can be found above the control panel accordance with current I.E.E. Regulations for the wiring (Fig 4, below).
  • Page 16: Wiring Diagram

    SECTION XX • XXXXXXXXX SECTION 3 • INSTALLATION Fig. 7 – Wiring Diagram Make sure that the phase (L) and the neutral (N) are connected to the correct terminals on the connector. The appliance is phase sensitive therefore swapping the phase and neutral will lead to a fault in the appliance.
  • Page 17: Temporary Water Heater Temperature Change

    INSTALLATION • SECTION 3 XXXXXXXXX • SECTION XX TEMPORARY WATER HEATER for 20 minutes. If, for example, the secondary pre-set TEMPERATURE CHANGE water heater temperature is set at 70°C, the water heater temperature returns back to normal operation as soon as It is possible to change the water heater temperature the temperature at the secondary measuring point has been above 65°C for more than 20 minutes.
  • Page 18: Hwst Tank Dimensions And Wiring Diagram

    SECTION XX • XXXXXXXXX SECTION 3 • INSTALLATION Fig 9 – HWST Tank Dimensions HWST 200 HWST 300 STORAGE TANKS T&P outlets Thermostat Drain access 28 mm valve PLAN VIEW " Hot water Tank inspection hatch supply 1" Return 28 mm T&P outlets "...
  • Page 19: Flue Systems

    The following pages show standard kits and additional position where it may cause injury to persons resulting items for concentric flue supplied by Andrews. Horizontal from touching a hot surface. Guards can be ordered with and vertical flue kits must be ordered separately. Flue kits flue components.
  • Page 20 SECTION XX • XXXXXXXXX SECTION 3 • INSTALLATION CWH30 & CWH60 Flue Systems The CWH30 & CWH60 uses a concentric flue system, 125mm outside diameter with an inner flue of 80mm diameter. Flue components fit together with silicon sealing rings and the flues are retained with sealing clamps. Each heater can be ordered with either a horizontal or vertical flue kit.
  • Page 21 INSTALLATION • SECTION 3 XXXXXXXXX • SECTION XX CWH30 & CWH60 Alternative Flue Systems CWH30 max 50M Conventional CWH60 max 20M Conventional CWH30 max 14M Concentric CWH60 max 12M Concentric Over 1.5M use flue Condense trap. Minimum between Condense Tap Vertical terminals 300mm drain...
  • Page 22 SECTION XX • XXXXXXXXX SECTION 3 • INSTALLATION CWH30 & CWH60 Standard Flue System Dimensions ALL 80/125mm Ø CONCENTRIC FLUE Ø125 Ø80 Ø 123/124 CONDENSATE TRAP PART No E310 Ø80 45º ELBOW C/W CLAMP PART No E308 Ø80 VERTICAL FLUE TERMI NAL C/W CLAMP (CONDENSING) PART No E067 90º...
  • Page 23: Flue Systems - Cwh 90 & 120

    INSTALLATION • SECTION 3 XXXXXXXXX • SECTION XX CWH90 & CWH120 Flue Systems The CWH90 & CWH120 uses a concentric flue system, 200mm outside diameter with an inner flue of 130mm diameter. Flue components fit together with silicon sealing rings and the flues are retained with sealing clamps. Each heater can be ordered with either a horizontal or vertical flue kit.
  • Page 24: Alternative Flue Systems - Cwh 90 & 120

    SECTION XX • XXXXXXXXX SECTION 3 • INSTALLATION CWH30 & CWH60 Alternative Flue Systems CWH90 max 50M Conventional CWH120 max 40M Conventional CWH90 and CWH120 max 14M Concentric Minimum clearence Over 1.5M use flue between vertical condensetrap. balanced flue terminals Condense Tap drain 600mm...
  • Page 25: Standard Flue System Dimensions - Cwh 90 & 120

    INSTALLATION • SECTION 3 XXXXXXXXX • SECTION XX CWH90 & CWH120 Standard Flue System Dimensions ALL 130/200MM fl CONCENTRIC FLUE fl200 fl130 fl130 fl 198/199 fl 198/199 CONDENSATE TRAP 45… ELBOW C/W CLAMP PART No E220 PART No E216 fl32 VERTICAL FLUE TERMINAL C/W CLAMP PART No E670...
  • Page 26: Flue Systems - Cwh 30

    SECTION XX • XXXXXXXXX SECTION 3 • INSTALLATION FLUE SYSTEMS Fig 11 Terminal Positions with Minimum Distance Directly below an opening, air brick, opening window etc. Above an opening, air brick, opening window etc Horizontal to an opening, air brick, opening window etc. Below a gutter or sanitary pipework Below the eaves Below a balcony or carport roof...
  • Page 27: Flue System - Horizontal And Vertical Terminations

    INSTALLATION • SECTION 3 XXXXXXXXX • SECTION XX Flue Systems Fig 12...
  • Page 28: Air Supply And Ventilation Concentric Flue Systems

    SECTION XX • XXXXXXXXX SECTION 3 • INSTALLATION AIR SUPPLY AND VENTILATION CONCENTRIC FLUE SYSTEMS The following notes are intended to give guidance: Air vents should have negligible resistance and must not be sited in any apposition where they are likely to be Where the heater is to be installed in a room, NO VENTS ARE REQUIRED.
  • Page 29: Air Supply And Ventilation - Concentric And Conventional Flue Systems

    INSTALLATION • SECTION 3 XXXXXXXXX • SECTION XX AIR SUPPLY AND VENTILATION AIR SUPPLY AND VENTILATION CONCENTRIC FLUE SYSTEMS CONVENTIONAL FLUE SYSTEMS IMPORTANT For all installations, please refer to the table below for calculating requirements. Detailed recommendations for 1. The effective area requirements specified in the table the air supply are given in BS5440, Part 2, and BS6644, are related to the maximum heat input of the heater(s) Clause 19.3 and in IGE/UP/10, Pt 1.
  • Page 30: Alternative Flue Systems - Cwh 30

    SECTION XX • XXXXXXXXX SECTION 3 • INSTALLATION AIR SUPPLY AND VENTILATION CONVENTIONAL FLUE SYSTEMS The minimum effective areas of the permanent air vents require in the compartment are as follows: Air Vents Areas Position of Air Vents Air from Room or Internal Space Air Direct from Outside High Level 10cm...
  • Page 31: Heat Exchanger Configuration

    INSTALLATION • SECTION 3 XXXXXXXXX • SECTION XX CWH HEAT EXCHANGER CONFIGURATION The water heater is equipped with 1, 2, 3 or 4 burner modules depending on the model. Each burner module has its own automatic burner. CONTROL PANEL The operational status of the water heater can be seen and the desired temperature can be set on the control panel (Fig 13, right) A green and a red LED can be found on the control panel for...
  • Page 32: Water Temperature Settings

    SECTION XX • XXXXXXXXX SECTION 4 • WATER TEMPERATURE SETTING Water Temperature Setting TEMPERATURE SETTING The water heater temperature can be set between 40°C and 70°C using the + and – buttons on the control panel. The maximum temperature for the Legionella flushing programme is 75°C.
  • Page 33: Instructions For Commissioning

    INSTRUCTIONS FOR COMMISSIONING • SECTION 5 XXXXXXXXX • SECTION XX FILLING THE WATER HEATER ADJUSTMENT 1. Check that the tank drain tap is closed The correct proportion of gas and air can be controlled 2. Check that the return valve in the 28mm pipe (close to based on the CO percentage in the flue gasses.
  • Page 34: Control And Adjustment At Full Load

    SECTION XX • XXXXXXXXX SECTION 5 • INSTRUCTIONS FOR COMMISSIONING CONTROL AND ADJUSTMENT CONTROL AND ADJUSTMENT AT FULL LOAD AT LOW LOAD 1. Switch the water heater off and flush system until the 1. Select low load with the – button. When the actual tank is completely cooled down burner capacity is above 25%, the CO percentage...
  • Page 35: Fault Codes

    FAULT CODES • SECTION 6 XXXXXXXXX • SECTION XX FAULT CODES A fault code will appear in the control panel display if there Lockout faults can be reset using the reset button. Only is a lockout failure. A letter and the number of the burner the burner module for which the fault code appears in the module appear alternately in the display.
  • Page 36: Maintenance

    SECTION XX • XXXXXXXXX SECTION 7 • MAINTENANCE MAINTENANCE At least once a year, the following works must be 6. If the water heater is to be drained for any reason, first carried out: take the water heater out of operation and then proceed as follows: 1.
  • Page 37: Spares List For Cwh Range

    XXXXXXXXX • SECTION XX PARTS LIST • SECTION 8 SPARE LIST FOR CWH RANGE Parts Description Part Number Quantity Main Dungs Gas Valve Assembly E659 M1835 1 per module Main Gas Valve O Ring E845 M1842 1 per module Fan Assembly & Gasket E658 M1834 1 per module...
  • Page 38: Parts List

    SECTION 8 • PARTS LIST Parts Description Part Number Quantity Temperature/Pressure Relief Valve C380 1 – 30 & 60 kW C380 2 – 90 & 120 kW Andrews Dome Label E856 M1845 MAXXflo Dome Label E927 M2290 Front Cover E919 M2264...
  • Page 39: Unvented System Kits

    UNVENTED SYSTEMS KIT INSTALLATION DETAILS MAXXFLO WATER HEATER CWH30/60/90/120 B173 B173 Condensate trap Condensate drain COMPLETE UNVENTED SYSTEMS KIT PART NO. B328 – MAXXflo Description Andrews Part No Combined Reducing Valve/Strainer C784 Check Valve C785 Expansion Valve C786 Expansion Vessel (25 Litre)
  • Page 40 Authorised User No. 00284 0087 Baxi Commercial Division Sales: Technical: Wood Lane, Erdington, 0845 070 1056 0845 070 1057 Birmingham B24 9QP Email: andrews@baxicommercialdivision.com www.andrewswaterheaters.co.uk...

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