MHS Boilers STRATA1 Series Instructions For Installation, Servicing & Operation
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MHS Boilers STRATA1 Series Instructions For Installation, Servicing & Operation

Wall mounted, gas fired, ultra high efficiency condensing boiler
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See also: Instructions for Installation, Servicing & Operation
W A L L M O U N T E D , G A S F I R E D ,
U LT R A H I G H E F F I C I E N C Y C O N D E N S I N G B O I L E R
I N S T R U C T I O N S F O R I N S TA L L AT I O N , S E R V I C I N G
& O P E R AT I O N F O R M O D E L S 4 5 , 6 0 & 7 5
L 102

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  • Page 1 W A L L M O U N T E D , G A S F I R E D , U LT R A H I G H E F F I C I E N C Y C O N D E N S I N G B O I L E R I N S T R U C T I O N S F O R I N S TA L L AT I O N , S E R V I C I N G &...

  • Page 2: Table Of Contents

    STRATA1 Index page section 3 ... . .1.0 General Notes 4-5 ... .2.0 Product Description 6 ... . .3.0 Technical Data &...

  • Page 3: General Notes

    STRATA1 1.0 general notes These instructions are intended to assist the installer, commissioning engineer, maintenance engineer and user with the installation, maintenance and usage of Strata 1, 45, 60 and 75 models gas fired condensing boilers. Please read this manual fully before commencing the installation of the appliance. The Strata 1 must only be installed by persons deemed to be competent i.e.
  • Page 4 STRATA1 2.0 product description The Strata 1 range of wall mounted gas fired condensing boilers are state of the art appliances which include a comprehensive range of features. The appliance must only be used on sealed and pressurised systems. System design must take into account the boiler operating ∆t of 20°C. wall mounted with compact dimensions At 900H x 458W x 435D, the Strata 1 boiler provides maximum heat from minimum dimensions without compromising serviceability.
  • Page 5 STRATA1 2.0 product description (contd) natural gas or LPG Appliances can be supplied for use with natural gas (G20) or LPG (G31). comprehensive microprocessor control The boiler control panel includes a user friendly microprocessor control centre which manages the entire function of the appliance and encompasses:- 1.

  • Page 6: Technical Data & Dimensions

    STRATA1 3.0 technical data & dimensions Model Strata 1 Nominal Heat Input Nett (max) plan - models 45/60/75 Nominal Heat Output 80/60°C 41.3 54.7 69.1 Nominal Heat Output 50/30°C 45.2 59.9 75.6 Input Rate Nat Gas (max) Input Rate LPG G31 (max) 1.76 2.33 2.95...

  • Page 7: Delivery Consignment/Unpacking The Boiler

    STRATA1 4.0 delivery consignment /unpacking the boiler The boiler is delivered as a consignment of a carton containing the boiler and associated fittings, plus any other optional ancillary flue or control components in separate cartons. The boiler carton contains:- Assembled boiler Wall mounting bracket Fittings carton including 2Nr 11/4”...

  • Page 8: Wall Mounting

    STRATA1 7.0 wall mounting The Strata 1 boiler mounts to the wall via a wall mounting bracket which interlocks to a rail mounted upon the rear of the boiler. The wall mounting bracket should be firmly fixed to the wall using suitable fixings with countersunk heads.

  • Page 9: System Flow & Return Connections

    STRATA1 9.0 system flow & return connections Note The Strata 1 boiler must only be installed on sealed and pressurised systems. The maximum working pressure of the boiler = 3 bar. A safety valve set 3.0 bar is supplied with the boiler and must be installed onto the flow pipe adjacent to the boiler.

  • Page 10: Condense Waste Connection

    - See section 16 for general space cooling. Multiple Boilers On common flues serving multiple boilers, contact MHS Boilers Ltd. Important Note Where the Strata 1 is to be installed in an application where the combustion air is likely to be contaminated with oxidising agents, such as swimming pool areas, special industrial processes etc, then the appliance must be room sealed.

  • Page 11: Conventional Flue Installation

    The Strata 1 boiler has an excess pressure combustion system, which coupled with the very low flue gas temperatures produced allows the appliance to exhausted over considerable distances using 80mm Polypropylene PPS flue pipe and fittings. Suitable flue pipe and fittings are available from MHS Boilers Ltd and are listed below.
  • Page 12 A range of concentric flue components are available from MHS Boilers Ltd and are listed below. Alternatively, two seperate tubes, one carrying combustion air and one carrying flue gas may be used in conjunction with the appropriate adaptor.
  • Page 13 STRATA1 13.0 room sealed flue installations (contd) plan 80/125 Effective Length 450mm Concentric Tube x 500mm Flue Air for 1000 80/125 Combustion Concentric to 2 x 80 mm Tubes Adaptor 80/125 Effective Length 950 mm Concentric Tube x 1000mm 80/125 80/125 ø...
  • Page 14 STRATA1 13.0 room sealed flue installations (contd) Concentric Wall Terminals Standard Horizontal Discharge Wall Terminal (supplied with 80/125 Concentric 90º bend and wall bezel plates not shown) Horizontal Wall Terminal With Extendable Vertical Discharge (supplied with 80/125 Concentric 90º bend and wall bezel plates not shown) 850* * From 01/10/00...
  • Page 15 STRATA1 13.0 room sealed flue installations (contd) installation of standard wall terminal with rear outlet In order to determine the length of concentric tube required to correctly terminate a rear outlet arrangement, the following procedure should be followed. 1. Measure wall thickness W in mm - see fig 10. 2.
  • Page 16 STRATA1 13.0 room sealed flue installations (contd) method of assembly of horizontal concentric flue system using standard wall terminal. 1. Lubricate male ends of concentric bend with silicone grease and locate bend into flue and air tube connection sockets on the top of the boiler and gently push fully home.
  • Page 17 STRATA1 Installation of Vertical Discharge Wall Terminal With Side Outlet ø80 PPS Side Outlet 90º Bend ø80 Bird Mesh ø80 PPS Tube Required Length measure from Cutting Line this point Exhaust Outlet TL (mm) Installed vertically TL = W+L1+260mm Upwards on Some Wall Aspect...
  • Page 18 STRATA1 Method of assembly of extendable vertical discharge wall terminal assembly. See fig. 18 1. Lubricate male ends of concentric bend with silicone grease and locate bend into flue and air tube connection sockets on the top of the boiler and gently push fully home. 2.

  • Page 19: Examples Of Calculating Flue Pressure Loss

    STRATA1 14.0 examples of calculating flue pressure loss example 1 thermal up-draught when A Strata 1-60 boiler is installed with a concentric flue flue gas temp 80°C and outside temp -5°C system which takes an all horizontal route to a wall terminal.
  • Page 20 STRATA1 14.1 calculating flue resistance The excess pressure available for Boiler Model Component Resistance P.a. overcoming the frictional resistance of a flue 80/125 Concentric Wall Terminal 11.0 16.0 system is 100 Pa. 80/125 Concentric Roof Terminal Without Rain Cap 11.0 16.0 The adjacent table of flue component 80/125 Concentric Roof Terminal With Rain Cap...
  • Page 21 STRATA1 15.0 flue terminal positions (contd) Minimum dimensions of flue terminal positions see fig 19 Dimension Terminal Position Balanced flue Non room room sealed sealed Directly below an opening, air brick, windows etc. Not Recommended. 300 mm 300 mm but installation but installation not recommended.
  • Page 22 STRATA1 16.0 ventilation requirements single appliances The room or space in which the Strata 1 boiler is installed may require to be ventilated in accordance with BS5440: Part 2: 2000 or BS 6644: 1991 as appropriate to the boiler input. Alternative guidance may be found in IGE/UP/10.
  • Page 23 STRATA1 16.0 ventilation requirements single appliances (contd) Table 6 Compartment Installation - Room sealed flue Natural Ventilation direct to outside air. Boiler Model Ventilation Openings Free Area cm High Level Low Level Strata 1/45 Strata 1/60 Strata 1/75 Compartment Installation - Room Sealed Flue Table 7 Natural Ventilation from Adjacent Room Boiler Model...
  • Page 24 The Strata 1 is not limited to just the systems shown, and may be used in conjunction with many commercially available control items. For further advice or guidance on schematic designs or control options contact MHS Boilers Ltd.
  • Page 25 STRATA1 17.0 hydraulic system design System Type 1 Typical single Strata 1 boiler installation serving heating only where the boiler's own in-built circulating pumps are used to circulate the water around the system (used only where system index resistance < pump residual head - see page 24). Flow temperature may be Fixed/constant or weather variable Outside air temperature sensor, used where direct-on-boiler weather compensated flow...
  • Page 26 Room temperature controls e.g. RE2132 modulating room unit from MHS Boilers, or, separate time clock & room thermostat HWS sensor from MHS Boilers. Gives 24Hr HWS operation W/T= Alternative to "S" where "W" is a time switch in series with a cylinder thermostat "T".
  • Page 27 Outside air temperature sensor, used where direct-on-boiler weather compensated flow temperatures are required. Room temperature controls e.g. RE2132 modulating room unit from MHS Boilers, or, separate time clock & room thermostat. PRO1=Pump regulation module from MHS Boilers. Allows heating pump to be driven from boiler, providing for auto operation, frost protection running &...
  • Page 28 Outside air temperature sensor, used where direct-on-boiler weather compensated flow temperatures are required. Room temperature controls e.g. RE2132 modulating room unit from MHS Boilers, or, separate time clock & room thermostat. HWS sensor from MHS Boilers. Gives 24hr HWS operation W/T= Alternative to "S"...
  • Page 29 Outside air temperature sensor, used where direct-on-boiler weather compensated flow temperatures are required. Room temperature controls e.g. RE2132 modulating room unit from MHS Boilers, or, separate time clock & room thermostat. HWS sensor from MHS Boilers. Gives 24hr HWS operation W/T= Alternative to "S"...
  • Page 30 Outside air temperature sensor, used where direct-on-boiler weather compensated flow temperatures are required. Room temperature controls e.g. RE2132 modulating room unit from MHS Boilers, or, separate time clock & room thermostat. Flow temperature sensor Return temperature sensor Hot water temperature sensor or thermostat KKM2=Modulating Kaskade Manager.
  • Page 31 55ºC. Includes ratio setter for compensation of under floor coils. Max pump motor loads 2A RC1= RE2132 modulating room unit from MHS Boilers provides Time & Temperature control for radiator heating zone.
  • Page 32 STRATA1 17.0 hydraulic system design System Type 8 Typical Single Strata 1 boiler installation serving heating and domestic hotwater via a system pump and 2Nr 2Port motorised valves with conventional controls i.e. programmer, room stat & cylinder stat. NOTE: system temperature will be fixed constant and direct-on- boiler weather compensation is not possible.

  • Page 33: Filling The System

    STRATA1 17.1 filling the system The initial filling of a sealed heating system, and subsequent refilling, must be by a method that has been approved by the Water Regulation Advisory Scheme (WRAS) for that type of heating system. ie. Domestic (In-house) Fluid Category 3 (C-3).

  • Page 34: Inclusion Of Strainers

    STRATA1 17.3 inclusion of strainers The return pipework must include some method of filtering or straining. The Filter or strainer must be fitted with isolation valves to allow easy cleaning with the minimum amount of water loss and water replenishment. 17.4 low water pressure protection A low water pressure switch must be included within the system design and interlocked to the boiler to shut the boiler down in the event of the water pressure falling below 0.5 bar.

  • Page 35: Electrical Connections

    STRATA1 plan of internal electrical connections...
  • Page 36 STRATA1 typical electrical connection schematic to suit system type 1...
  • Page 37 STRATA1 typical electrical connection schematic to suit system type 2...
  • Page 38 STRATA1 typical electrical connection schematic to suit system type 3...
  • Page 39 STRATA1 typical electrical connection schematic to suit system type 4...
  • Page 40 STRATA1 typical electrical connection schematic to suit system type 5...
  • Page 41 STRATA1 typical electrical connection schematic to suit system type 6...
  • Page 42 STRATA1 typical electrical connection schematic to suit system type 7...
  • Page 43 STRATA1 typical electrical connection schematic to suit system type 8...
  • Page 44 In addition to the ability of the boiler to be connected to traditional industry standard control systems, MHS Boilers can supply a range of dedicated matched controls which not only simplify the selection of controls but in addition enhance the efficiency of the boiler and comfort conditions within the building.
  • Page 45 STRATA1 18.1 optional matched controls (contd) multiple boiler Kaskade manager KKM2 modulating sequence controller: A comprehensive compact wall mounted microprocessor control panel which allows the control of up to five Strata 1 boilers. The KKM2 provides fully modulating control over the connected boilers ensuring precise output control and maximum efficiency.

  • Page 46: Volt Control

    The actual fault description will be displayed upon the LCD screen of the boiler. Connection to the volt free contacts is made via an alarm plug and lead assembly available from MHS Boilers Ltd. The alarm plug and lead connects to socket Remote Alarm Circuit x9 located in the lower area of the boiler control panel.

  • Page 47: Pre-Commissioning Checks

    STRATA1 19.1 pre-commissioning checks Ensure system has been thoroughly cleansed and flushed, any strainers have been cleaned and that the appropriate water treatment has been added to the system to prevent corrosion, scale formation etc. Ensure the system and boiler has been properly and fully flooded and vented of air and the cold fill pressure at the boiler is at a minimum 0.5 bar.
  • Page 48 STRATA1 19.1.1 dip switch settings Dip Switch 1 No Mixing Valve Control Fitted Underfloor Zone Mixing Valve Control Fitted (MR03) Dip Switches 6 & 7 (system operating temperature) Dip Switch 6 6 OFF 7 OFF Low Temp 55/45ºC Radiator Circuit (mt 70/50ºC) Radiator Circuit (ht 85/65ºC) 6 OFF 7 ON Med Temp 70/50ºC 6 ON 7 OFF High Temp 85/65ºC...

  • Page 49: First Firing (Contd

    STRATA1 19.3 First Firing (contd) Turn the green potentiometer Control Panel (HWS) fully clockwise(60ºC). ECO/ECO On/Off Display Plus Switch Switch Attach U tube manometer to the gas pressure test point on the gas supply prior to the appliance. The nominal pressure should be STATUS PLUS 20mb for NG or 37mb for LPG.

  • Page 50: First Firing (Contd

    STRATA1 19.3 First Firing (contd) NOTE: Test period expires after 10 minutes - if this expires whilst commissioning is still in progress, press Engineers button twice to reset and carry on with necessary checks and adjustments. To exit “10 min Low” test period - press Engineers button once, this will set controls to auto. Turn the green potentiometer (whilst still in “10 min Low”...

  • Page 51: Dip Switch Settings

    STRATA1 Default Compensation Slope Dip Switch Settings When compensation req'd outside sensor must be installed and dip switch No.2 set to "ON". Slope A - Dip 6 ON & Dip 7 OFF or 6 ON 7 ON Max Flow Temperature Slope B - Dip 6 OFF &...
  • Page 52 STRATA1 Range of Parallel Displacement of Slope B BLUE BLUE +5 +10 +15 +20 +25 Outside Air Temperature ºC Range of Parallel Displacement of Slope C BLUE BLUE +5 +10 +15 +20 +25 Outside Air Temperature ºC...

  • Page 53: Setting Domestic Hot Water Temperature

    STRATA1 19.5 setting domestic hot water temperature A) With HWS sensor in/on DHW Calorifier. Set desired stored hotwater temperature by using the “green” potentiometer on the boiler control panel. This arrangement will give the potential to charge hot water continuously (24 hour/day) with priority over the heating demand.

  • Page 54: Service Button/Setting Heating Output (Contd

    STRATA1 19.6 Service button/setting heating output. (contd) Setting minimum pump speed. If it is required to limit the minimum pump speed of the in built boiler pumps then this may be done by the following: Press “red” reset button once. Press service button once.

  • Page 55: Servicing Instruction

    STRATA1 21. servicing instruction GENERAL In general, maintenance/inspections should take place: When the display on the unit indicates that inspection is required (status shows “SERVICE”). At least every 12 months, before carrying out any maintenance the unit must be inspected. 21.1 inspection Ask the user about any problems with the boiler unit or any other comments.
  • Page 56 STRATA1 21.2 maintenance (contd) The pressure of the installation must be between 1 and 2 bar: any possible leaks in the system must be identified; if necessary, have a pipework engineer solve the problem. Possible leaks or weeping must be resolved immediately. In case of water leakage or ingress from the air supply pipe, the cause must be found.
  • Page 57 STRATA1 22. screen display/ diagnosis of faults 22.1 Screen display The control panel of the Strata 1 boiler has an LCD screen, displaying two lines of data. This screen provides information about the operation of the appliance; it shows operation messages (non flashing) and fault messages (flashing display).
  • Page 58 STRATA1 22.1 screen display/diagnosis of faults (contd) STATUS MESSAGES (FLASHING DISPLAY) INDICATING A FAULT A flashing display indicates a fault and that the boiler has shutdown (lockout). The boiler will not attempt to operate until the “red” reset button is pressed. Any repetitive flashing fault message should be investigated, the cause found and corrective action taken.
  • Page 59 STRATA1 22.1 screen display/diagnosis of faults (contd) Fan 2 low Upper burner fan speed too low 9,10,11,14,18,29,31,33 during pre-purge Fan 2 oper Upper burner fan is detected as 4,11,29,31 operating when should be idle Flame 2 on/w Flame is detected at the upper 17,30 burner when there should be no flame...
  • Page 60 STRATA1 22.2 (possible) Causes of fault (contd) 11 - Fan is defective / Replace fan 12 - There is no gas supply available / Investigate, restore gas supply 13 - Low gas pressure / Investigate and rectify 14 - Fuse defective / Check fuses and replace as necessary 15 - Gas valve min output setting is incorrect / Check and adjust min output CO 16 -...

  • Page 61: Instructing The User

    STRATA1 23.0 instructing the user The installer should inform the user about the operation and use of the Strata 1 boiler and in particular point out:- - Any safety provisions -The need to carry out regular maintenance when the screen display shows a “SERVICE” message The installer must provide the user with all documentation relating to the Strata 1 boiler and any ancillary items.
  • Page 62 STRATA1 24.0 Strata 1 45,60,75 exploded view...
  • Page 63 QW/0102/4575 A member of the Modular Heating Group Plc 35 Nobel Square, Burnt Mills Industrial Estate, Basildon, Essex SS13 1LT Tel: 01268 591010 Fax: 01268 728202 www.mhsboilers.com This publication is issued subject to alteration or withdrawal without notice. The illustrations and specifications are not binding in detail. All offers and sales are subject to the Company's current terms and conditions of sale.

This manual is also suitable for:

Strata1 60Strata1 45Strata1 70

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