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 Efciency (Nett Non-Condensing) % 98.1 98.3

Maximum Efciency (Nett Condensing) % 108.9 108.6

Seasonal Efciency % 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 specications 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

180

110

655

995

415

715

840

170

400

• All dimensions are in millimetres unless

otherwise specied.

• 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 notication.

TECHNICAL DOCUMENTATION 05

SAFETY GUIDELINES

CONDITIONS

Mikroll 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 certication.

The manufacturers instructions MUST NOT be taken in any way as overriding statutory obligations.

This boiler has been tested and certied to comply with all necessary European directives, latest building

regulations and efciency 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 modied in any way. Any modications 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

Mikroll products should always be used, installed and maintained in accordance with the statutory

requirements, specications and standards applicable to these installations. Mikroll 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 Mikroll 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 satises 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 Identication 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

TECHNICAL DOCUMENTATION 09

DESCRIPTION

BOILER CONTROL

If there is a heat demand, and if all necessary conditions have been fullled and all safety devices are

satised, 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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