Stuart Turner Mikrofill ETHOS 350 Guida
ETHOS 350 & 550 FLOOR STANDING CONDENSING BOILERS
TECHNICAL DOCUMENTATION
2023/02REV. 00
CONDENSING BOILERS
TABLE OF CONTENTS
01. Technical Data 04 07. Operating Instructions 22
Operation
02. Dimensions 05 Controls
Boiler Module 23
03. Safety Guidelines 06 PCB Symbol Key
Conditions Switching On the Appliance 24
General Guidelines Switching Off the Appliance
Service 07 Information Display 25
General Restrictions DHW Operation
Heating Operation
04. Description 08 Displaying Information
General Table Parameter List
Working Principle and Design History Mode 26
Application Features Possible Error Codes
Main Components 09 Possible Error Codes continued. 27
Rear Connections
Boiler Control 10 08. Commissioning 28
Safety Aspects General
Reference Value for Maximum Load
05. Delivery & Transport 11 Reference Value for Minimum Load
Delivery Maximum Load Adjustment 29
Transport Minimum Load Adjustment
Moving Setting the CO2Value for the ETHOS Range 30
Access Requirements Conversion from Natural Gas to Propane 31
06. Installation 12 09. Cascade Set-Up 31
Regulations Auto Detection Mode
Installation Guidelines Cascade Test Mode 32
Ventilation 13
Gas Connection 10. Maintenance 33
Water Connections Safety
Electrical Connections Servicing Schedule
0 - 10 V Control Removal of Gas Valve and Venturi 34
Internal Controls Breakdown (Main PCB) 14 Removal of Fan and Burner Assembly 35
Internal Controls Breakdown (Control Fascia) 15 Setting / Checking of Electrode and Probe Gaps 36
External Controls Breakdown (Din Rail)
Controls and Options 16 11. Component List 37
Flue Connection 17 Casing and Electrical Components
Condense Removal Core Components 38
Flue Length 18
Calculation of Diameter and Length 12. Conversion Formulae & Factors 39
Condense Connections 19
Safety Valve Connection 13. Notes 41
Hydraulic System
Shut-Off Valves 20
Valves (Boilers in Cascade Arrangement)
Draining and Cleaning
Water Circulation System
Water Pressure 21
System Expansion Vessel
Water Pressure Protection Device
Water Temperature
Water Quality
Water Hardness 22
TECHNICAL DOCUMENTATION 03
TECHNICAL DATA
GENERAL
Dimensions (Height x Width x Depth)[1] mm 1300 x 750 x 1100 1300 x 750 x 1500
Model ETHOS 350 ETHOS 550
Water Content of Appliance litre 25 30
Weight (Empty) kg 234 370
Flow / Return Connections BSP DN50 PN16 Flange DN65 PN16 Flange
Gas Connection BSP 1½” 1½”
Flue Connection mm 150 180
Power Consumption W 558 898
Electrical Supply V 230 230
Frequency Hz 50 50
Fuse Protection A 10 10
Maximum Fan Speed RPM 6100 9200
Minimum Fan Speed RPM 1300 1950
HEATING PERFORMANCE
Nominal Heat Input (Nett) kW 17.5 - 350.0 27.5 - 550.0
Nominal Heat Output at 80/60°C kW 17.2 - 343.0 27.0 - 539.0
Nominal Heat Output at 50/30°C kW 18.9 - 378.0 29.7 - 594.0
Maximum Gas Consumption
G20 m3/hr 35.5 56.1
G25 m3/hr 40.4 62.1
G31 m3/hr 13.6 20.9
TECHNICAL DATA
Flue Gas Dew Point °C 52 52
Flue Temperature at 80/60°C (at ambient temperature of 20°C) °C 75 75
Flue Material Temperature Class T 120 T 120
Permitted Maximum Resistance of Flue System[2] Pa 200 250
Condensation pH Value 3.0 - 5.5 3.0 - 5.5
Maximum CH Flow Temperature °C 90 90
CH Water Pressure (Minimum / Maximum) bar 0.5 - 6.0 0.5 - 6.0
Minimum / Maximum Gas Pressure
G20 mbar 17 - 20 17 - 20
G25 mbar 17 - 20 17 - 20
G31 mbar 30 - 50 30 - 50
ENVIRONMENTAL DATA
NOXLevels mg/kW 31.0 31.0
Maximum Efciency (Nett Non-Condensing) % 98.1 98.3
Maximum Efciency (Nett Condensing) % 108.9 108.6
Seasonal Efciency % 95.6 95.6
[1]
[2]
Depth dimensions are taken from the front to the rear of the casing and do not include the external pipework. Height dimensions are
taken from the bottom of the boiler and do not include the height of the supplied adjustable feet.
With this resistance value the heat output will remain within the specications indicated on the dataplate; if the resistance is higher,
the heat output will be reduced.
04 TECHNICAL DOCUMENTATION
DIMENSIONS
▲ FIGURE 01. DIMENSIONS OF THE ETHOS FLOOR STANDING BOILERS.
ETHOS 350 ETHOS 550
A in 1” 1”
B mm Ø 32 Ø 32
C in 1½” 1½”
D in 2” 2½”
E mm Ø 150 Ø 180
F mm 1100 1500
1300
750
400
95
180
110
655
995
415
715
840
170
400
E
D
D
A
B
C
F
• All dimensions are in millimetres unless
otherwise specied.
• Depth dimensions are taken from the front
to the rear of the casing and do not include
the external pipework.
• Height dimensions are taken from the
bottom of the boiler and do not include the
height of the supplied adjustable feet.
• Data may deviate slightly due to fabrication
tolerances.
• We reserve the right to make changes
without prior notication.
TECHNICAL DOCUMENTATION 05
SAFETY GUIDELINES
CONDITIONS
Mikroll Systems Ltd. shall not be liable for any damages caused by non-compliance with this manuals
instructions. Only original parts must be used for service purposes.
GENERAL GUIDELINES
The appliance is not intended for use by persons (including children) with reduced mental, physical or sensory
capabilities, or lack of experience or knowledge, unless they have been given supervision or instruction
concerning the use of the appliance by a person responsible for their safety.
It is a statutory requirement that all gas appliances are installed in accordance with the manufacturers
instructions and all regulations in force. All instructions should be fully read before installing or using the
appliance. All installations should be carried out by competent persons as described in the Gas Safety
(Installation and Use) Regulations i.e. Gas Safe registered and holding current certication.
The manufacturers instructions MUST NOT be taken in any way as overriding statutory obligations.
This boiler has been tested and certied to comply with all necessary European directives, latest building
regulations and efciency requirements, is CE marked and complies with;
• 2009/142/EC Gas Appliance Directive.
• 2014/30/EU Electromagnetic Compatibility Directive.
• 2014/35/EU Low Voltage Directive.
This boiler should be installed in compliance with;
• Building Regulations.
• Building Regulations (Scotland-Consolidated).
• Building Regulations (Northern Ireland).
• The Health and Safety at Work Act.
• Gas Safety (Installation and Use) Regulations.
• Water Fittings Regulations or Water By-laws in Scotland.
• Local Water Company By-laws
The boiler should not be modied in any way. Any modications will invalidate the gas approval and invalidate
the warranty.
ATTENTION: HIGH VOLTAGE!
Before opening the boiler casing for maintenance or servicing, the 230 VAC main supply
to the boiler must be disconnected!
06 TECHNICAL DOCUMENTATION
SAFETY GUIDELINES
SERVICE
Should you require any assistance during installation or in the unlikely event of a product failure please do not
hesitate to contact our technical department on 03452 60 60 20.
GENERAL RESTRICTIONS
Mikroll products should always be used, installed and maintained in accordance with the statutory
requirements, specications and standards applicable to these installations. Mikroll cannot be held
responsible for any losses or damage whether direct or consequential that have arisen as a result of incorrect
or poor installation.
WARNING!
Particular attention must be given to the safety guidelines as non-compliance will render
the warranty void and may constitute an illegal installation.
Detailed recommendations are contained in the following Standards and Codes of Practice:
• BS 5854
• BS 6644
• BS 6880
• IGE/UP/1
• IGE/UP/2
• IGE/UP/10
Flue and Flue Structures in Buildings.
Installation of Gas Fired Hot Water Boilers of Rated Inputs between 70kW and 1.8MW
(net) (2nd and 3rd Family Gases).
Low Temperature Hot Water Heating Systems of Output greater than 45kW.
• Part 1: Fundamental and Design Considerations.
• Part 2: Selection of Equipment.
• Part 3: Installation, Commissioning and Maintenance.
Soundness Testing and Purging of Industrial and Commercial Gas Installations.
Gas Installation Pipework, Boosters and Compressors on Industrial and Commercial
Premises.
Installation of Gas Appliances in Industrial and Commercial Premises.
TECHNICAL DOCUMENTATION 07
DESCRIPTION
GENERAL
The Mikroll ETHOS oor standing boilers are environmentally friendly gas red heating boilers with a modulation
range between approximately 10% and 100% of their maximum output. The appliances have low NOXand
CO emission, which satises the most stringent environmental requirements.
The ETHOS range has received UKCA and CE approval for all relevant countries
and has been registered under the Product Identication Number 86CL109.
The boilers may only be used on open (type B23) systems.
The boiler is delivered fully wired, fully assembled, tested and preset complete with emissions report.
WORKING PRINCIPLE AND DESIGN
Air is drawn in as required, via a variable speed fan. The gas valve measures the negative pressure (draught)
in the venturi and modulates the gas valve in response. The gas and air is then thoroughly mixed in the correct
ratio in the fan housing and red directly into the burner.
The boiler management system compares the actual water ow temperature to the required water
temperature. The management system computes the load required and adjusts the fan speed. This is a
continual process during operation.
The heat transfer takes place in a stainless steel triple heat exchanger block. The burner res into the primary
heat exchanger whilst the second heat exchanger (condenser) is connected downstream in such a manner
that the condense water cannot enter the primary heat exchanger, all heat exchangers consist of several
smooth pipes in the form of a coil and are connected using stainless steel water distribution manifolds.
APPLICATION FEATURES
The design of the boiler incorporates the following:
• Full Operation and Fault Diagnostics via LCD.
• Control / High Limit Sensors.
• Integral DHW Control (DHW Input Signal Required).
• Integral Safety Relief.
• Integral Weather Compensation (Optional External Sensor Required).
• Frost Protection.
• Pressure Read Out.
• Compatible with most External BMS Options.
08 TECHNICAL DOCUMENTATION
DESCRIPTION
FRONT VIEW: BACK VIEW:
BOTTOM CONNECTIONS:MAIN COMPONENTS:
01 Burner #00 Control Unit
02 Burner #01 Control Unit
03 Combustion Fan
04 Control Fascia
05 Electrical Connections
06 Gas Valve
07 Heat Exchanger and Burner Package
08 Flap Valve
09 Venturi
REAR CONNECTIONS:
10 Condense Outlet
11 Flow Connection
12 Gas Connection
13 Pressure Relief Valve Outlet
14 Return Connection
09
08
03
07
08
04
06
06
03
09
13
11
14
12
10
01
05
02
TECHNICAL DOCUMENTATION 09
DESCRIPTION
BOILER CONTROL
If there is a heat demand, and if all necessary conditions have been fullled and all safety devices are
satised, the boiler will start. This heat requirement will arise if:
• the ow temperature of the boiler is less than the required ow temperature.
• the frost protection has been triggered independently of the operating conditions.
The boiler control unit adjusts the boiler output by changing the fan speed such that the desired temperature
is attained and maintained. The actual ow temperature is controlled within 4°C of the target temperature.
SAFETY ASPECTS
The following safety devices are installed on the boiler:
• Temperature Monitoring System.
• High Limit Temperature Monitoring System.
• Limit Temperature Monitoring System.
• Flame Monitoring by means of Ionisation Measurement.
• Fan Speed Monitoring.
• Flow Monitoring using a Flow Water Temperature Sensor.
If one of these safety systems is activated, the boiler will go to an interlocking or lockout condition and will
be switched off. Lockout conditions can only be reset by pressing the reset button, after rectifying the fault.
10 TECHNICAL DOCUMENTATION
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