MHS Boilers Elco ADI-Nox HT Series Operating & Maintenance Manual
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MHS Boilers Elco ADI-Nox HT Series Operating & Maintenance Manual

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ADI-Nox HT Boiler
With LMS Controls
Models 105 to 950
Operating & Maintenance Manual
MHS Boilers Ltd
3 Juniper West
Fenton Way
Southfields Business Park
Basildon
Essex
SS15 6SJ
Tel: 01268 546700
Fax: 01268 888270
WWW.MHSBOILERS.COM
L349

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  • Page 1 ADI-Nox HT Boiler With LMS Controls Models 105 to 950 Operating & Maintenance Manual MHS Boilers Ltd 3 Juniper West Fenton Way Southfields Business Park Basildon Essex SS15 6SJ Tel: 01268 546700 Fax: 01268 888270 WWW.MHSBOILERS.COM L349...

  • Page 2: Table Of Contents

    1. INTRODUCTION _________________________________________________________________________________ 3 2. REGULATIONS _________________________________________________________________________________ 7 3. EEC APPROVALS AND CERTIFICATIONS ___________________________________________________________ 7 4. BOILER GENERAL VIEW: DESCRIPTION OF THE COMPONENTS ________________________________________ 8 5. DIMENSIONS __________________________________________________________________________________ 10 6. TECHNICAL DATA______________________________________________________________________________ 12 6.1 Models ADI HT 105 to ADI HT 400 ________________________________________________________________ 12 6.2 Models ADI HT 475 to ADI HT 950 ________________________________________________________________ 13 7.
  • Page 3 21. APPENDIX I: LIST OF ERROR CODES ____________________________________________________________ 77 Please note that this manual is liable to changes and alterations or withdrawal without prior notice MHS Boilers Ltd reserve the right to make modifications without notice and any changes made are not necessarily retrospective to older models.

  • Page 4: Introduction

    ADI HT boiler - Technical Manual 1. INTRODUCTION The global trend, European and international, aims at improving energetic efficiency both in buildings and generators, in order to reduce pollutant emissions in the atmosphere (directive SAVE, KYOTO agreement) Carbon dioxide (CO ) is one of the greenhouse gases that remain the longest in the atmosphere.
  • Page 5 ADI HT boiler - Technical Manual 2. General Regulations / Application / Norms and Regulations General regulations This documentation contains important information, which is a base for safe and reliable installation, commissioning and operation of the Adinox Low Temperature Boiler. All activities described in this document may only be executed by authorized companies.
  • Page 6 - Low noise level - Broad control range - Can be supplied in a wide range of models Through active and market oriented research, MHS Boilers Ltd is in a position to offer solutions for the most challenging heating requirements. The Supplier MHS Boilers Ltd are proud to supply and technically support the Adinox Low Temperature Boiler Range of boilers throughout the United Kingdom.

  • Page 7: Regulations

    ADI HT boiler - Technical Manual 2. REGULATIONS The installation must be designed and realized by qualified professionals in accordance with the current regulations referring to gas, air venting, flues evacuation, electricity, safeties, fire prevention, etc. The boiler maintenance must be realized following the instructions of the manufacturer’s technical manual and with a minimum regularity as indicated by the current regulations.

  • Page 8: Boiler General View: Description Of The Components

    ADI HT boiler - Technical Manual 4. BOILER GENERAL VIEW: DESCRIPTION OF THE COMPONENTS Boiler heat exchanger (higher collector) Flanges (boiler heat exchanger – burner – air/gas fan) Ignition-ionization kit Flame indicator Motor fan (variable speed) Venturi for air inlet and mix with gas Gas shut-off valve Boiler control unit and power modulation Hot water flow...
  • Page 9 ADI HT boiler - Technical Manual Models ADI HT 250 and higher: L349...

  • Page 10: Dimensions

    ADI HT boiler - Technical Manual 5. DIMENSIONS ADI HT 130-150-200 ADI HT 105 ADI HT 250 - 475 F (7) 151.5 82.5 1110 134.3 112.5 1110 134.3 112.5 1110 134.3 112.5 1110 217.3 177.5 1583 1156 217.3 177.5 1583 1156 1583 1156...
  • Page 11 ADI HT boiler - Technical Manual ADI HT 550 - 950 F (7) 1628 1060 1396 1040 1040 1628 1060 1396 1628 1060 1396 1040 1658 1063 1393 1083 1040 1658 1063 1393 1083 1040 (*) Attention: Heights H, HG, HA, HF, without taking into consideration the increase due to the silent-block feet supplied with the boiler (dimension “SB”).

  • Page 12: Technical Data

    ADI HT boiler - Technical Manual 6. TECHNICAL DATA 6.1 Models ADI HT 105 to ADI HT 400 CONCEPT Units Maximum power Power output (average water 149.3 temp: 70ºC) Minimum power Power output (average water 31.9 45.7 58.5 70.3 80.1 98.4 temp: 60ºC) Maximum...
  • Page 13 ADI HT boiler - Technical Manual 6.2 Models ADI HT 475 to ADI HT 950 CONCEPT Units Maximum power Power output (average water temp: 70ºC) Minimum power Power output (average water 141.6 166.9 187.7 211.1 244.5 367.7 temp: 60ºC) Maximum 483.3 563.6 638.3...

  • Page 14: Boiler Heat Exchanger

    ADI HT boiler - Technical Manual 7. BOILER HEAT EXCHANGER The boiler heat exchanger (flues-water) is made of steel. The boiler heat exchanger consists of 2 water collectors, an upper one and a lower one, connected by means of multiple vertical tubes forming the combustion chamber. The vertical tubes generate a big heat transfer surface that uses the sensible heat of the flues.
  • Page 15 ADI HT boiler - Technical Manual (1) Burner of fire resisting alloy mesh (2) Ionization electrode (checking the flame presence) (3) Ignition electrode (4) Pilot flame (5) Venturi for the air-gas mix (6) Double gas shut-off valve (7) Gas inlet (boiler gas connection to the installation) (8) Fan for the air-gas mix (9) Variable speed motor fan...

  • Page 16: Assembly Of Gas Connection - Air/Gas Inlet

    ADI HT boiler - Technical Manual 8.1 Assembly of gas connection – air/gas inlet The ADI HT boiler includes an air-gas premix system of modulating combustion, composed of: Venturi operating as an air-gas mixer, ensuring combustion with a constant proportion of air/gas to the premix burner, throughout its power modulation range.
  • Page 17 ADI HT boiler - Technical Manual Exploded view of the assembly burner – fan – gas valve for models HT 250 and higher: Motor-fan rotating backward or forward depending on the model. L349...

  • Page 18: Air Inlet Filter

    ADI HT boiler - Technical Manual 8.2 Air inlet filter The air inlet to the venturi is protected by a filter retaining the dust that is usually in the atmosphere. Attention: it is important to avoid excessively dusty or dirty environments (for ex.

  • Page 19: Burner

    ADI HT boiler - Technical Manual 9. BURNER The boiler includes an air-gas premix burner of innovative design and material: Fire resisting alloy mesh. Homogeneous and stable combustion in case of any change in the power demand. High mechanic resistance and high resistance to high temperatures. Very low thermal inertia ...

  • Page 20: Control Panel - Siemens

    ADI HT boiler - Technical Manual 10. CONTROL PANEL - SIEMENS The boiler control panel is placed in the upper part of the boiler front. (A) Boiler on/off switch (B) Display: readings, messages, errors... Selection of DHW heating mode Selection of heating operation mode Display of information Confirmation of setting Chimney sweep function...

  • Page 21: Display

    ADI HT boiler - Technical Manual Set the installation in manual operation. The different relays remain in a certain status (on/off) depending on a predefined setting. Deaeration mode when pressing > 3 sec. To enter in parametrization mode. To confirm the values of adjustment of the parameters on the display. For quitting the setting.
  • Page 22 ADI HT boiler - Technical Manual Selecting Heating Mode This setting is used to switch between the different operating modes. The selection mode is indicated by a bar which appears below the respective symbol. Automatic operation Heating mode according to the time program Temperature setpoint according to heating program Comfort setpoint or Reduced setpoint Protective functions active...
  • Page 23 ADI HT boiler - Technical Manual Displaying information Various data can be displayed by pressing the Info button. Possible displays Error messages Maintenance messages Operation messages Room temperature Boiler temperature Outside temperature DHW temperature State heating circuits State of DHW State of boiler State of solar Date and time of day...

  • Page 24: Programming

    ADI HT boiler - Technical Manual 10.2 Programming User levels The user levels only allow authorized user groups to make settings. To reach the required user level, proceed as follows: Operation Display example Description This is the basic display. If the basic display is not shown, press ESC to return to it.
  • Page 25 ADI HT boiler - Technical Manual Overview of setting USER LEVELS SETTINGS Enduser Time of day and date Commissioning Operator section Heating engineer Wireless Time prog heating circuit 1 Time prog heating circuit 2 Time prog 3/heating circuit 3 Time program 4/DHW Time program 5 Holidays heating circuit 1 Holidays heating circuit 2...
  • Page 26 ADI HT boiler - Technical Manual Press OK button and the value will blink. While the value is blinking, use the setting knob to set the correct date. Confirm with OK button. Move the setting knob and set the parameter 3 “Year”. Press OK button and the value will blink.

  • Page 27: Available Parameters At Enduser Level

    ADI HT boiler - Technical Manual 10.3 Available parameters at enduser level When you are in the main display, press to enter at “Enduser level”. Choose the required parameter by turning the setting knob and confirm with OK. Modify the parameters depending on the required adjustments.

  • Page 28: Boiler Lockout Code

    ADI HT boiler - Technical Manual 10.4 Boiler lockout code Meaning In case of boiler lockout or an error in the installation, the symbol is shown. Press the button INFO and the error code with its meaning appears on the display. To detect the type of error, see the “list of Error Codes”...

  • Page 29: Control Of Several Boilers - Cascaded System

    ADI HT boiler - Technical Manual 11. CONTROL OF SEVERAL BOILERS – CASCADED SYSTEM In an installation with several boilers it is important that the power generated by the boilers adapts at any moment to the demand of the installation, always optimizing the generators’ efficiency. MASTER BOILER CONTROL SLAVES BOILERS CONTROL CASCADE COMMUNICATION BUS...
  • Page 30 ADI HT boiler - Technical Manual Note: the cascaded return temperature sensor will be connected only when non-condensing boilers ADI HT are installed, in order to control the return temperature (3560,3562). This controller will regulate: Pump circuits (CCP, DHW pump): they will be blocked. Mixing circuits: the flow temperature will be reduced according to the lockout signal and the mixing valve will close progressively.
  • Page 31 ADI HT boiler - Technical Manual Lead strategy (3510) The heat sources are switched on and off according to the selected lead strategy while giving consideration to the preset output band. In the strategy “Early on, late off”, additional boilers are switched on as early as possible (output band min) and switched off again as late as possible (output band min).
  • Page 32 ADI HT boiler - Technical Manual Switch on delay (3533) Correct adjustment of the switch-on delay ensures that plant operating conditions will be stable. This prevents too frequent switching actions of the boilers (cycling). Auto source sequence changeover (3540) With automatic changeover of the heat source sequence, the boiler loads in a cascaded system can be influenced by defining the order of lead and lag boiler.
  • Page 33 ADI HT boiler - Technical Manual b) Example of boilers sequence and power control Example of a possible sequence that can be made (multiple options can be chosen). L e i s t B a n d M a x = 8 0 % L e i s t B a n d M i n = 4 0 % 4 0 0...

  • Page 34: External Control Signal 0...10 V To Regulate Start-Up And Power Modulation Of Each Boiler

    ADI HT boiler - Technical Manual 11.2 External control signal 0…10 V to regulate start-up and power modulation of each boiler (A) 0…10 V connection If using 0 to 10 volt the following prameters must be changed. 5977 to Heat Generation Lock 5978 to NC So that each boiler can receive and process an external signal 0…10 V.
  • Page 35 ADI HT boiler - Technical Manual These are the setpoints that we get from 0...10 V demand: Voltage (V) Setpoint (ºC) If it is necessary to get different values of temperature, change the following values to get a new linear characteristic: m = (F2-F1) / (U2-U1) F2 = Final Temperature (ºC)
  • Page 36 ADI HT boiler - Technical Manual 12. ELECTRIC DRAWING The electric installation must comply with the current rules. The electric power consumed by each boiler is indicated in the table of technical characteristics. ADI HT 105 to ADI HT 850: The electric supply must be 220/230 V, 50 Hz, single phase, ground connection. (Remember: in case of 220/230 V, two phases, it is necessary to install an electric insulating transformer with one of the phases of the secondary connected to ground acting as neutral).

  • Page 37: Electric Drawing Adi Ht 105 - 850 (Single-Phase Motor)

    ADI HT boiler - Technical Manual 12.1 Electric drawing ADI HT 105 – 850 (single-phase motor) 12.2 Electric drawing ADI HT 950 (three-phase motor) L349...
  • Page 38 ADI HT boiler - Technical Manual L349...

  • Page 39: Cover Of Siemens Electronical Board

    ADI HT boiler - Technical Manual 12.3 Cover of Siemens electronical board For the low power/dimension size of ADI boilers see attached pictures: 12.4 Cable entry points At the rear part of the boiler. ADI medium/great power: ADI low power: L349...

  • Page 40: Heating Circuits

    ADI HT boiler - Technical Manual 13. HEATING CIRCUITS For the heating circuits, a number of functions are available (see parameters table) which can be individually set for each heating circuit. Every heating circuit can be a virtual circuit, pump circuit or mixing circuit. The Mixing function is available only when an external extension module (AGU2.550A109) is needed.
  • Page 41 ADI HT boiler - Technical Manual Electric drawing: 1 Boiler with 3 heating circuits L349...

  • Page 42: Heating Circuits Basic Parameters

    ADI HT boiler - Technical Manual 13.1 Heating circuits basic parameters Activation of heating circuits Heating circuits are deactivated in default parametrization (heat demand of the boiler is given by the parameter 1859 “Flow temp setp cons request”). Adjust the following parameters to enable the heating circuits and to assign the extension modules to each heating circuit.
  • Page 43 ADI HT boiler - Technical Manual Setpoints The room temperature can be shifted according to different setpoints. These setpoints become active depending on the selected operating mode, thus producing different temperature levels in the rooms. The ranges of adjustable setpoints result from interdependencies, as this is shown in the following diagram: BZ 710 BZ 716 BZ 1010...
  • Page 44 ADI HT boiler - Technical Manual Summer/winter heating limit The summer/winter heating limit (730,1030,1330) is used to switch the heating on and off in the course of the year, depending on the outside temperature. In Automatic operation, switching on/off takes place automatically, so there is no need for the user to do this manually.
  • Page 45 ADI HT boiler - Technical Manual Using this limitation, a temperature range for the flow temperature setpoint can be defined. If the flow temperature setpoint called for by the heating circuit reaches the relevant limit and the request for heat increases or decreases, the flow temperature setpoint is maintained at the maximum (741,1041,1341) or minimum (740,1041,1341) limit.
  • Page 46 ADI HT boiler - Technical Manual Room influence When a room sensor is used, there is a choice of 3 different types of compensation and it is necessary to adjust this parameter (750, 1050, 1350): Setting Type of compensation Weather compensation alone 1…99% Weather compensation with room influence 100%...
  • Page 47 ADI HT boiler - Technical Manual During quick setback (780,1080,1380), the heating circuit pump is deactivated and, in the case of mixing valve circuits, the mixing valve is fully closed. When using the room sensor, the function keeps the heating switched off until the room temperature drops to the level of the Reduced setpoint or the Frost protection level.

  • Page 48: Domestic Hot Water

    ADI HT boiler - Technical Manual Xoff 1/4 °C Meaning Room temperature setpoint Actual value of room temperature Xoff Forward shift of switch-off time Forward shift of switch-on time Time program 14. DOMESTIC HOT WATER If there is demand for DHW, the heat sources can be switched on at any time. The strategy is to produce the amount of heat required at a certain point in time –...

  • Page 49: Basic Parameters

    ADI HT boiler - Technical Manual b) Electric drawing: 1 Boiler and Domestic Hot Water SIEMENS AVS37.294 14.1 Basic parameters Activation of Domestic Hot Water Domestic Hot Water is deactivated in default parametrization. Connect the DHW tank temperature sensor in B3 terminal of the boiler and push the operation mode button until a bar appears below the symbol Adjust the following parameter to enable the relay output for the charging pump Q3.

  • Page 50: Professional Installator Parameters

    ADI HT boiler - Technical Manual 14.2 Professional installator parameters Release When DHW heating is On, the release parameter (1620) can be used to determine when – within a 24-hour period – DHW charging shall take place. When “24h/day” is used (the default value), DHW heating is continuously released as long as it is On.
  • Page 51 ADI HT boiler - Technical Manual None DHW heating and space heating take place at the same time. In the case of tightly sized boilers and mixing heating circuits, the DHW setpoint may not be reached if space heating calls for considerable amounts of heat. MC shifting, PC absolute The pump heating circuits stay locked until the DHW storage tank is heated up.

  • Page 52: Safeties

    ADI HT boiler - Technical Manual 15. SAFETIES These are the safeties included in the boiler: Cause for safety Safety Boiler restart activation component of the boiler No flame Ionization Manual reset electrode Fan failure/air Air pressure Manual reset passage obstruction switch Overheating Safety...

  • Page 53: Installation

    ADI HT boiler - Technical Manual 17. INSTALLATION 17.1 Boilers heat output The boilers total power output to be installed must be the proper one to respond to the demands of the installation. In order to generate heating with the maximum efficiency at every moment, it is important to consider the number of the boilers to be installed, so that the total power should be appropriate for the different demands of the installation in the different periods of the year.

  • Page 54: Gas Supply

    “Technical data”. To select the type and its Inertial volume speed of opening/closing, consult the MHS Boilers Units Boiler model Product Support. An inertial tank must be installed between the gas ADI HT 105 0.0102...

  • Page 55: Chimneys

    ADI HT boiler - Technical Manual 17.5 Chimneys The flues outlet, according to the current rules, must ensure a correct evacuation of the burnt gases, without backward flows and without producing condensate. The natural draught of the chimney must evacuate the burnt gases from the boiler flues outlet.

  • Page 56: Flue Draught Stabilizer

    ADI HT boiler - Technical Manual 17.5.2 Flue draught stabilizer In case of excessive draught / depression (this can cause vibrations in the chimney), or a chimney with fan for flues diluted with air, you have to install a flue draught stabilizer inside the chimney. In this case, you have to install a stabilizer for each boiler to guarantee the correct draught of the chimney in all the boiler operating modes: at the minimum power, at the maximum power and at intermediate points.

  • Page 57: Adjustable Flue Damper At The Boiler Flue Outlet

    ADI HT boiler - Technical Manual 17.5.4 Adjustable flue damper at the boiler flue outlet Every installation is different because of: different chimney different outdoor temperature (maximum and minimum), according to the height on the sea level. The opening of the flue damper must be adjusted, by means of a flues damper sticker with graduated scale, according to the values indicated at the beginning of this chapter, for a correct and quick adjustment of the boiler combustion.

  • Page 58: Hydraulic Installation

    ADI HT boiler - Technical Manual 17.6 HYDRAULIC INSTALLATION 17.6.1 Data to be considered Concept Value Minimum water working pressure 1 bar Maximum water working pressure 5 bar Maximum flow water temperature 90ºC Minimum return water temperature 60ºC Minimum water pressure safety device The boiler includes a water pressure switch, that stops the boiler once the water pressure achieves a minimum value.

  • Page 59: Hydraulic Pressure Drop

    ADI HT boiler - Technical Manual 17.6.3 Hydraulic pressure drop The boiler pressure drop depends on the water flow; the maximum ∆T must be 15 ºC: Units 105 130 ΔT = 10ºC 8.9 11.2 12.8 16.3 19.8 22.5 27.7 32.7 39.9 46.9 53.0...

  • Page 60: Water Manifold

    ADI HT boiler - Technical Manual 17.6.4 Water manifold It avoids hydraulic unbalances between the circuits and the boilers. It ensures a constant water flow to the boiler, independently from the consumptions required. In accordance with current regulations. In case of heavy sludge in the water, it drives it to the bottom of the tank. It can not avoid lighter sludge.

  • Page 61: Water Quality Of The Installation

    ADI HT boiler - Technical Manual 17.6.5 Water quality of the installation It is important to follow the instructions indicated in the present manual. The primary circuit of an installation, being a closed circuit, can not be refilled with non-treated water. Periodical refillings with non-treated water could cause a constant input of: Oxygen and dissolved gases (contributing to produce oxidation and corrosion in the installation).

  • Page 62: System Drawings

    ADI HT boiler - Technical Manual 17.7.6 System drawings Boiler Controller Water collector or water manifold D.H.W. buffer vessel Thermostat Temperature sensor Plate heat exchanger Boiler circulation pump Pressure switch Manometer Mesh filter Closed expansion vessel Thermometer Filter to separate sludge, oxides Non-return valve Automatic air venting Mixing valve...
  • Page 63 ADI HT boiler - Technical Manual System drawing of heating circuits System drawing of one boiler and only D.H.W. L349...
  • Page 64 ADI HT boiler - Technical Manual System drawing: D.H.W. and heating circuit System drawing of an old installation: heating circuit L349...
  • Page 65 ADI HT boiler - Technical Manual System drawing of an installation with high pressure in the secondary circuit (very high building with the boilers room in the ground floor), or old installation in very bad conditions: heating circuit. System drawing of an installation as in the previous case: D.H.W. and heating circuit. L349...

  • Page 66: Minimum Return Water Temperature To Boilers And System Drawings

    ADI HT boiler - Technical Manual 17.6.7 Minimum return water temperature to boilers and system drawings MAXIMUM water flow temperature of the boilers must be ALWAYS lower than 90ºC. Return water temperature must be always higher than 60ºC, in order to avoid condensing of water and the boiler corrosion (due to very low pH value of condensates).

  • Page 67: The Boiler Start-Up

    ADI HT boiler - Technical Manual 18. THE BOILER START-UP 18.1 Before the start-up The first start-up is a very important operation on which the future effectiveness and reliability of the equipment can depend. For this reason, it must be carried out by our own Official Technical Assistance Service. Before the start-up, it is important to check that: The installation is in accordance with this manual’s instructions and with the local regulations.

  • Page 68: The Boiler Control Unit And Operating Cycle

    ADI HT boiler - Technical Manual 18.3 The boiler control unit and operating cycle The control unit regulates: The boiler operating cycle. The boiler safeties (by indicating also the possible reasons for the boiler lockout). The boiler power modulation. Short description of the boiler operating cycle: LEGEND of the operating phases: Display Meaning...

  • Page 69: Gas/Air Adjustments

    ADI HT boiler - Technical Manual 18.4 Gas/air adjustments All the boilers are tested in our factory and every one is supplied with a table indicating the combustion figures. Both the start-up and the maintenance must be realized by authorized technical staff. First of all verify: electric supply, if the gas connection is air vented, type of gas and pressure, if the heating demand is at the maximum value, correct draught of the chimney, if the hydraulic installation is vented, if the pump is correctly working...
  • Page 70 ADI HT boiler - Technical Manual g) Check the content of CO with the flues analyzer (by introducing the probe inside the chimney flue outlet of the boiler that you are adjusting). h) Repeat the previous steps both at the maximum and the minimum power until the values of CO are correct at both stages.

  • Page 71: Change Of Fuel: From Propane Gas To Natural Gas

    ADI HT boiler - Technical Manual 18.4.2 Change of fuel: from Propane gas to Natural gas In order to change fuel, it is sufficient to adjust the boiler combustion, with the new fuel, to the correct parameters either for Natural Gas or for Propane Gas. The process is the same if you have to change from natural gas to propane.
  • Page 72 ADI HT boiler - Technical Manual Front view of the boiler inside (ADI HT 250 and larger models): (c, d) Disconnect the electric connections and the pressure pipes: (a) Pressure pipe connecting the gas valve to the venturi (just included in models starting from ADI HT 250). (c) Motor fan: electric supply connection (in the higher part of the motor).

  • Page 73: Position Of Probes And Sensors

    ADI HT boiler - Technical Manual 19.2 Position of probes and sensors (1) Water flow temperature sensor (2) Water return temperature sensor (3) Safety overheating thermostat (4) Water pressure sensor (5) Manual air venting (their number varies according to the model). L349...

  • Page 74: Combustion Data

    ADI HT boiler - Technical Manual 19.3 COMBUSTION DATA Combustion data: Air excess CO not diluted Flues temperature Room temperature Efficiency Chimney natural draught Water temperatures (flow, return) Ionization Gas consumption: Gas type Flow Gas pressure (inlet, injectors) Combustion chamber pressure Air/gas mix pressure Burner pressure Ignition (air, gas)

  • Page 75: Boiler Guarantee

    5. The boilers within the warranty period will be repaired free of charge in case of manufacturing faults. 6. MHS Boilers Ltd Service should be contacted to organise repairs under Warranty. MHS Boilers Ltd will provide Service Personel, according to their availability, to investigate reported faults. Where non MHS Boilers Ltd Service / Maintenance contractors have attended to carry out repairs the Warranty may not be valid.
  • Page 76 ADI HT boiler - Technical Manual F. Lack of water. It is obligatory to supply the installation with minimum water content, so that it can circulate through the boiler with constant flow and without interruption. G. Gas connection: no correct pressure, no proper dimensions or inadequate type of gas. H.

  • Page 77: Appendix I: List Of Error Codes

    ADI HT boiler - Technical Manual 21. APPENDIX I: LIST OF ERROR CODES ERROR DIAGNOSTIC DESCRIPTION OF ERROR - TEXT DIAGNOSTIC CODE CODE No error Outside sensor fault Check connection and component Boiler temperature 1 sensor fault 439-440 Short circuit or Open circuit boiler flow sensor (B2). Check connection and component Flue gas temperature sensor fault 539...544 Short circuit or Open circuit flue gas sensor.
  • Page 78 ADI HT boiler - Technical Manual ERROR DIAGNOSTIC DESCRIPTION OF ERROR - TEXT DIAGNOSTIC CODE CODE Flow temp HC2 not reached Check installation and components Maximum boiler temperature exceeded 501-502 Supervision exceeded, no temperature modification after flame DHW charging temperature not reached Check installation and components DHW legionella temperature not reached Check installation and components...
  • Page 79 ADI HT boiler - Technical Manual ERROR DIAGNOSTIC DESCRIPTION OF ERROR - TEXT DIAGNOSTIC CODE CODE Solar integration missing Check connection and component Cascade flow sensor B10 missing Check connection and component B10 Extension module 3 fault Check connection and component Repetition internal Call technical service Repetition speed...
  • Page 80 MHS Boilers Ltd 3 Juniper West Fenton Way Southfields Business Park Basildon Essex SS15 6SJ T: 01268 546700 F: 01268 888270 L349...

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