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INSTALLATION AND MAINTENANCE MANUAL
MAXXfl o EVO
High effi ciency condensing stainless steel storage water heater
CWH 90/302, CWH 120/302
Please read and understand these instructions before commencing installation and leave this manual with the customer for future reference.
Andrews. Built to perform.
M9373
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Table of Contents
Related Manuals for andrews CWH 120/302
Summarization of Contents
General & Safety Information
Description of Heater
Overview of the MAXXflo EVO water heater, its features, and integrated controls.
For Whom is this Manual Intended?
Identifies the target audience for this installation and maintenance manual.
Symbols Used in this Guide
Explains the various warning and information symbols used throughout the manual.
Safety
Usage and Competency
Specifies requirements for safe operation and qualified personnel.
General Safety
Covers essential safety precautions for gas, flammability, and hot water.
Heater Installation and Maintenance
Highlights the importance of correct installation and maintenance procedures.
Regulations and Standards
Lists relevant standards, codes of practice, and building regulations.
CE Marking
Details the CE marking and its confirmation of compliance with directives.
Technical Data
Product Fiche
Summary of key performance and efficiency data for the water heater.
Performance Data
Detailed technical specifications including heat input, output, gas consumption, and electrical data.
General Dimensions & Connections
Provides physical dimensions and connection details for the 300 litre models.
System Schematic Examples
Illustrates typical system configurations for single and parallel MAXXflo EVO units.
Wiring Diagrams
Shows detailed wiring diagrams for the MAXXflo EVO 90 & 120 KW models.
Installation
Locating the Heater
Guidance on selecting a suitable location for the heater, considering flue, air supply, and access.
Cold Water Supply
Details on cold water inlet connections, system types, and water quality considerations.
Unvented Design
Information on installing unvented systems and associated components like expansion vessels.
Condensate Disposal
Instructions for safely discharging condensate from the heater.
Flue Systems and Ventilation
Covers flue system requirements, material suitability, ventilation, and terminal positions.
Gas Connections
Procedures and requirements for connecting the gas supply to the heater.
Electrical & Communication Connections
Details on mains supply, terminal access, and communication interfaces like Modbus.
Commissioning
Filling and Removal of Air
Steps for filling the DHW tank and system and removing trapped air before operation.
Commissioning the Heat Engines
Procedures for testing and setting up the individual heat engines for optimal performance.
Conversion from Natural Gas to Propane
Instructions for converting the heater from natural gas (G20) to LPG (G31).
Frost Protection & Legionella
Details on automatic frost protection and measures to prevent Legionella bacteria growth.
Final Checks & User Handover
Final checks, setting time/date, and instructing the end-user on operation and maintenance.
Fault Finding
Guidance on identifying and resolving common faults and lockout conditions.
Maintenance
Routine Inspection Intervals and Requirements
Recommended schedule and requirements for regular servicing and inspection.
Inspect and Clean Burner Assembly
Detailed steps for inspecting and cleaning the burner, fan, and gas valve.
Removing and Changing Components
Procedures for safely removing and replacing various internal components.
Flushing/Descaling the Heat Exchangers
Instructions for flushing and descaling the heat exchangers to maintain efficiency.
Component Illustrations
Visual guides and part numbers for various components and spares.
Recommended Spares Requirements
List of recommended spare parts to keep on hand for quick repairs.
Error Codes
A comprehensive list of error codes, their descriptions, and diagnostic notes.
Need help?
Do you have a question about the CWH 120/302 and is the answer not in the manual?
Questions and answers