andrews MAXXflo EVO Series Manual

Andrews. Built to perform.
Please read and understand these instructions before commencing installation and leave this manual with the customer for future reference.
M8670
MAXXfl o EVO
High effi ciency condensing stainless steel storage water heater
CWH 30/201, CWH30/301, CWH60/201, CWH60/301
INSTALLATION AND MAINTENANCE MANUAL

General 2 MAXXfl o EVO
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General 3 MAXXfl o EVO
Table of Contents
Ref Subject Page
1.0 General & Safety Information
1.1 Description of heater ..............................................................................
1.2 For whom is this manual intended? ........................................................
1.3 Symbols used in this guide .....................................................................
2.0 Safety
2.1 Usage and competency ...........................................................................
2.2 General safety .........................................................................................
2.3 Regulations and standards ......................................................................
2.4 CE Marking ..............................................................................................
3.0 Technical Data
3.1 Technical data ..........................................................................................
3.2 Product Fiche ...........................................................................................
3.3 Performance data ....................................................................................
3.4 General dimensions and connections ......................................................
3.5 System Schematic examples ...................................................................
3.6 Wiring diagrams .......................................................................................
4.0 Installation
4.1 Locating the heater ..................................................................................
4.2 Removing the door and inner cover ........................................................
4.3 Cold water supply ...................................................................................
4.4 Unvented design .....................................................................................
4.5 Secondary return design (DHW circulation pump) .................................
4.6 Condensate disposal ...............................................................................
4.7 Flue systems and ventilation ...................................................................
4.8 Maximum fl ue lengths ..............................................................................
4.9 Gas connections ......................................................................................
4.10 Electrical & communication connections .................................................
5.0 Commissioning
5.1 Filling and removal of air ..........................................................................
5.2 Commissioning the heat engine ................................................................
5.3 Conversion to LPG .................................................................................
5.4 Frost protection and Legionella ................................................................
5.5 Final checks and user handover ..............................................................
5.6 Fault fi nding ..............................................................................................
6.0 Maintenance
6.1 Routine Inspection intervals & requirements ...........................................
6.2 Removing and changing components ....................................................
6.3 Component parts illustrations .................................................................
6.4 Recommended spares requirements .....................................................
6.5 Error codes .............................................................................................
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General 4 MAXXfl o EVO
1.1 DESCRIPTION OF HEATER
This Andrews Water Heaters MAXXfl o EVO is a gas fi red, low NOx, direct fi red water heater, with an
integrated stainless steel tank.
Fully automatic electronic controls are integrated into the heater, with a wide range of control and sensor
options available. The controls also provides voltage free outputs for Enable, Burner On and fault indica-
tion. Full BMS integration is available through the use of Modbus and optional protocol devices.
Access to the controls of the heater via the Internet and/or mobile phone app, is possible through an
optional web server device available from Andrews Water Heaters.
The water heater consists of a stainless steel combustion chamber, premix burner, modulating fan, gas
valve, ignition and fl ame detection electrodes, water pressure sensor and a NTC fl ue sensor for safety
supervision.
The water heater is equipped with NTC sensors for precise temperature control on fl ow and return mani-
folds. Fully premixed, radiating, modulating burner, integrated with gas valve to deliver precise gas/air
mixture throughout the full modulation range.
Common combustion air intake manifold, takes air from boiler room (type B23 fl ue) or directly from out-
side via a combined fl ue system (C13, C33, C53 & C63).
The safety and operation functions of the water heater is managed by micro processor controlled circuit
board, modulating the water heater according to the demand. Control is performed using comparison
parameters between the requested temperature and fl ow temperatures from temperature sensors.
C L:
When a demand is started (DHW tank sensor is < DHW tank setpoint - Hysteresis), the water heater is
quickly ignited. The controls calculate the charging setpoint (factory standard is DHW tank setpoint +
2OC) and the heat engine then modulate the pump and burner so that the charging temperature into the
tank does not exceed the charging setpoint by more than 1OC.
When the DHW tank setpoint has been reached, the controls will switch off the water heater and the
controls will remain in standby until demand for heat is re-established.
When DHW tank temperature (B3 sensor) < DHW setpoint - DHW Hysteresis, demand will be restarted
and operation as described above, will begin again.
1.2 FOR WHOM IS THIS MANUAL INTENDED?
This manual is intended for the heating specialist who installs commercial/industrial heating plant and
equipment.
1.0 GENERAL & SAFETY INFORMATION

General 5 MAXXfl o EVO
1.3 SYMBOLS USED IN THIS GUIDE
DANGER!
Indicates serious danger to personal safety and life
DANGER of electric shock!
Indicates serious danger from electricity to personal safety and life
WARNING!
Very hot water can cause severe burns and in extreme cases death
CAUTION!
Indicates a potentially dangerous situation for the heater and the
environment
INFORMATION
Suggestions to assist the user in implementing instructions in this
guide
ADDITIONAL READING
Reference to additional information in other documents

Safety 6 MAXXfl o EVO
2.1 USAGE AND COMPETENCY
2.1.1 IMPROPER USE
This Andrews Water Heaters product has been designed and manufactured to comply with
current European standards of safety. However, following an improper use, dangers could arise
concerning the safety and life of the user or of other people, or damage could be caused to the
heater or other objects. This heater is designed to be used in a domestic hot water supply and
storage system. Any other use of this heater will be considered improper. Andrews Water Heat-
ers declines any responsibility for any damage or injuries caused by an improper use. In order
to use the heater according to its designed scope, it is essential to carefully follow the instruc-
tions given in this guide.
2.1.2 USER COMPETENCY
This heater is not intended for use by persons with reduced physical, sensory or mental capa-
bilities, or lack of experience and knowledge, unless they are given supervision or Instruction
concerning the use of it by a person responsible for their safety. Children under the age of 12
years should not be permitted to use the heater.
2.1.3 ENGINEER COMPETENCY
The installation, adjustment & servicing of this heater must be carried out by a competent
person and installed in accordance with current standards and regulations. Failure to correctly
install or maintain this heater could cause injury to persons or damage to property. The manu-
facturer shall not be held liable for any such injury and/or damage.
2.2 GENERAL SAFETY
2.2.1 SMELL OF GAS
If you smell gas - follow these safety instructions:
- Do NOT turn off or on any electrical switches (including light switches)
- Do NOT smoke
- Do NOT use the telephone
- DO evacuate persons away from the source of the gas smell
- DO close the main gas shutoff valve
- DO open all the windows and doors where the gas leakage has occurred
- DO inform the gas authority or a competent specialist as soon as possible
2.2.2 FLAMMABLE SUBSTANCES
Do not store or use explosive or easily inflammable material (such as petrol, paint or
paper) in the same room where this heater has been installed.
2.2.3 VERY HOT WATER
Water temperature over 50OC can cause burns and in severe cases injury or death. Children,
the elderly and the physically or mentally disabled are most at risk from scald injury. Feel water
before bathing and showering. Temperature limiting devices such as mixing valves should be
installed whenever possible to ensure safe temperatures at outlets
2.0 SAFETY

Safety 7 MAXXfl o EVO
2.2.4 HEATER INSTALLATION AND MAINTENANCE
This heater has been designed for use with G20 (natural gas) and G31 (liquefi ed propane gas) and
is manufactured to give an effi cient, safe and long service life. To ensure continued trouble-free op-
eration of this heater at maximum effi ciency, it is essential that correct installation, commissioning,
operation and service procedures are carried out strictly in accordance with the instructions given
in this manual.
Only original parts and accessories from the manufacturer may be used on this heater. Using non-
approved parts may compromise the safety of the heater and invalidate any warranty.
In the event of failure and/or suspected faulty functioning of the heater. Switch off the heater and
contact a suitable qualifi ed technician. Do not attempt to make any repairs yourself, unless you are
suitably qualifi ed and competent to do so.
2.3 REGULATIONS AND STANDARDS
This heater must be installed in accordance with relevant Standard Specifi cations, Codes of Practice and cur-
rent Building Regulations, together with any special regional requirements of the Local Authorities, Gas under-
taking and Insurance Regulations for the Electrical Equipment of Buildings. The installation of this heater must
be in accordance with the relevant requirements of:
• Health and safety at work act 1974
• Building regulations 2010
• Electricity at work regulations 1989
• Management of health and safety at work regulations 1998
• Manual handling regulations 1992
• Model water byelaws 1986
• BS 7671 - Requirements for electrical installations, IEE wiring, regulations
• BS 6644 - Specifi cation for the installation of Gas fi red hot water boilers for rated inputs between 70kW
(net) and 1.8 MW
• BS 7074-2 - Applications selection and Installation of expansion vessels and ancillary equipment for sealed
water systems.
• BS 6880:1 Code of practice for low temperature hot water heating systems of output greater than 45kW.
• BS 6880:2 Code of practice for low temperature hot water heating systems of output greater than 45kW.
• BS 6880:3 Code of practice for low temperature hot water heating systems of output greater than 45kW.
• CP 342:2 Code of practice for centralised hot water supply. Buildings other than individual dwellings.
• IM/11 - Flues for commercial and Industrial Gas Fired Boilers and Air Heaters
• IGE/UP/1 - Soundness Testing and Purging Procedure for Non Domestic Installations
• IGE/UP/2 - Gas Installation Pipe work, Boosters and Compressors for Industrial and Commercial Premises
• IGE/UP/10 - Installation of fl ued gas appliances in industrial and commercial premises.
• IGE/UP/16 - Design for Natural Gas installations on industrial and commercial premises with respect to
hazardous area classifi cation and preparation of risk assessments
These manufacturer’s notes must not be taken in any way as over-riding statutory
obligations.

Safety 8 MAXXfl o EVO
2.4 CE MARKING
There is one data plate located on the heater. This is mounted on the outside of the heater (left hand side)
The CE marking documents of this heater confi rms compliance with the essential requirements of the follow-
ing directives or Regulations:
• Gas Appliance (GAR) Regulation 2016/426
• Ecodesign Requirements for Energy Related Products (ERP) 2009/125/EC
• Electromagnetic Compatibility (EMC) Directive 2014/30/EU
• Low Voltage (LVD) Directive 2014/35/EU
• Boiler Effi ciency (BED) Directive 92/42/EEC
KEY
1 Type approval designation
2 Gas type and pressure
3 Model Name
4 Heat, gas fl ow & CO² data
5 Technical data
6 Serial number and year
This manual is an integral and indispensable part of the heater and it is suggested that
this manual is kept in a safe place for future reference.
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Technical Data 9 MAXXfl o EVO
Product name CWH
30/201
CWH
30/301
CWH
60/201
CWH
60/301
Daily electricity consumption
Qelec kWh 0.141 0.144 0.143 0.171
Declared load profile XL XXL XL XXL Sound power level, indoors
LWA dB 53 53 63 63
Daily fuel consumption
Qfuel kWh 20.016 24.758 21.174 24.869
Emissions of nitrogen oxides
NO Xmg/kWh 36 39 39 39
Weekly fuel consumption with smart controls
Qfuel, week, smart kWh ----
Weekly electricity consumption with smart controls
Qelec, week, smart kWh ----
Weekly fuel consumption without smart controls
Qfuel, week kWh ----
Weekly electricity consumption without smart controls
Qelec, week kWh ----
Storage volume Vl200 300 200 300 Mixed water at 40 °C V40 l∞∞880 ∞ Harmonised standards applied
Specific precautions that shall be taken when the water heater is assembled, installed or maintained:
EN: 13203-2
Before any assembly, installation or maintenance the installation and
operation manual has to be read attentively and to be followed
MAXXflo EVO
3.0 TECHNICAL DATA
3.1 TECHNICAL DATA SHEET

Technical Data 10 MAXXfl o EVO
Product name
CWH
30/201
CWH
30/301
CWH
60/201
CWH
60/301
Declared load profile XL XXL XL XXL Water heating energy efficiency class Water heating energy efficiency %95 98 91 97
kWh(1)
12 32 10 38
GJ (2) 16 20 16 20
Thermostat temperature setting ᵒC 60 60 60 60
Sound power level LWA indoors dB 53 53 63 63
Ability to off-peak hours functioning(3) Yes Yes Yes Yes
Enabled smart control settings(4) ----
(1) Electricity (2) Fuel (3) If applicable
(4) If smart control setting value is "1", the water heating energy efficiency and annual electricity / fuel consumption only relate to enabled smart control settings
Annual energy consumption
Other load profiles for which the water heater is suitable to use and corresponding water heating efficiency and annual electricity consumption(3)
MAXXflo EVO
3.2 PRODUCT FICHE