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MHS Boilers Strata 2 Instructions For Installation, Servicing & Operation

Gas fired high efficiency/ consdensing ultra low nox boiler single unit output 120kw
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G A S F I R E D H I G H E F F I C I E N C Y /
C O N S D E N S I N G U L T R A L O W N O x B O I L E R
S I N G L E U N I T O U T P U T 1 2 0 k W
I N S T R U C T I O N S F O R I N S T A L L A T I O N ,
S E R V I C I N G & O P E R A T I O N

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Summary of Contents for MHS Boilers Strata 2

  • Page 1 G A S F I R E D H I G H E F F I C I E N C Y / C O N S D E N S I N G U L T R A L O W N O x B O I L E R S I N G L E U N I T O U T P U T 1 2 0 k W I N S T R U C T I O N S F O R I N S T A L L A T I O N , S E R V I C I N G &...
  • Page 2 STRATA2 Index page section page section 3 ..1.0 General 25 ..5.8.2 Boiler Manager RVA 47 Product Description Installation Procedure Certification Details (Normally Factory Fitted) 3-5 ..2.0 Product Description 26 .

  • Page 3: General Notes

    The Strata 2-120 must only be installed by persons deemed to be competent i.e. Corgi Registered. This manual must be handed to the user following completion of the installation.

  • Page 4: Extended Flue Lengths & Difficult Flue Routes

    Note: These flue components are available exclusively from MHS. The Strata 2-120 includes a wealth of enhanced operating facilities and features as standard: Floor mounted with compact dimensions (provides maximum heat from a minimal footprint).
  • Page 5 STRATA2 2.0 product description (contd) The ‘master’ RVA47 (CLI) controller provides: • Overall modulating output in accordance with the demands of the system. • Inbuilt weather compensation giving direct-on-boiler VT control if required. • Remote stored domestic hot water temperature control •...

  • Page 6: Technical Data Table

    STRATA2 3.0 technical details 3.1 technical data Table 1 Single Multiple Boilers Multiple Boilers Model Strata 2 No. of Boilers No. of Burners/ Ht Exchangers No. of Cascade RVA Controllers 1 master 1 master 1 master 1 master 1 master Master &...

  • Page 7: Critical Dimensions

    STRATA2 3.2 critical dimensions appliance dimensions side rear Return (R1 ") Condense-Outlet plan ") Flow (R1 ") Syphon clean point Flue Outlet 110 Dia Gas (R1") Air Inlet 110 Dia Note: Re flow and return connections. Each boiler is equipped with 2Nr flow and 2Nr return connections.

  • Page 8: Installation Requirements

    4.3. 3.4 flue options The Strata 2-120 may be used with either an open or room sealed flue and air system. Approximately 100Pa is available as residual flue pressure at the exit from the appliance. Full details regarding flue specification are given in section 4.3.

  • Page 9: Terminal Position

    4.3 flue options & terminal position The Strata 2 has an excess pressure combustion system that allows the appliance to be exhausted over extended distances using small OD flue components. The flue gas temperature is extremely low (typically the same as the flow water temperature), which allows the use of easy to install PPS (polypropylene) flue pipe and fittings.
  • Page 10 1 thermal updraught when A single Strata 2-120 boiler is to be installed with a flue gas temp 80°C and outside temp -5°C conventional flue arrangement (taking combustion air A = Insulated or within the building...
  • Page 11 STRATA2 examples of calculating flue pressure loss example 2 A single Strata 2-120 boiler is to be installed with a room sealed flue using separate air and flue gas tubes effect of of DN100. flue system resistance The flue gas tube takes a part horizontal, part vertical on boiler output internal route to a roof termination.
  • Page 12 DN125 tube DN150 tube DN200 Volume - m For larger volumes or resistance of alternative tube sizes, contact MHS Boilers Flue Department flue system layouts flueing possibilities typical conventional flue installation. Air for combustion taken from the boiler room.
  • Page 13 STRATA2 4.3 flue options & terminal position (contd) flue system layouts flueing possibilities single boiler room sealed concentric flue with horizontal discharge Fig 4.3b flueing possibilities 1200 typical room sealed flue installations - single boiler Room Sealed Room Separate Air and Sealed Flue Gas Tubes Concentric...
  • Page 14 STRATA2 4.3 flue options & terminal position (contd) Additional Notes for Room Sealed Appliances: The Clean Air Act Memorandum prevents the use of balanced flue appliances discharging at low level where the total heat input to the plant room exceeds 150kW. Where the Clean Air Act does not prevent installation, the following rules must be applied.

  • Page 15: Ventilation Requirements

    STRATA2 4.3 flue options & terminal position (contd) Table 4 Dimension Terminal Balanced Flue Non room Position Room Sealed Sealed Directly below an opening, 300mm 300mm air brick, window etc Not recommended Not recommended Below gutters, soil pipes or drain pipes 75mm 75mm Below eaves...

  • Page 16: Hydraulic System Design

    If such a separator is not used, the MHS guarantee on all boiler parts will become null and void, unless it can be proved that the plastic pipes used have a vapour tight layer.

  • Page 17: Gas Supply

    Fig 4.5b 4.6 gas supply The Strata 2-120 is designed and set for Natural Gas group G20. The Gas Supplier should be consulted at the installation planning stage in order to establish the availability of an adequate supply of gas.

  • Page 18: Installation

    The boiler carton contains: Fully assembled boiler. The Strata 2-120 is also delivered with the following items: User manual and operating instructions. Installation and Servicing instructions for the Engineer. Built into each unit are the following: A gas stop cock for each heat module.

  • Page 19: Water Connections

    5.7 electrical connections – general The Strata 2-120 has a number of standard connection points. In addition, a number of panel locations have been reserved for the installation controller, which can be mounted in the spaces provided after removing the blank panels.
  • Page 20 STRATA2 5.7.2 connecting of system safety interlocks These switches are connected to the ‘dark green’ 3 pole plug. The central pole provides the common output (230V AC). The left hand terminal enables the lower module and the right hand terminal enables the upper module.

  • Page 21: Connection Diagrams

    Break on Break on Pressure Fall Pressure Rise Contactor Fig 5.7c suggested wiring arrangement for high/low pressure switches and multiple Strata 2 boilers Strata 2/120 Boiler Strata 2/120 Boiler Remote Safety Remote Safety Low Pressure High Pressure Interlocks...
  • Page 22 STRATA2 5.7.3 connection diagrams suggested hydraulic layout and basic wiring for Strata 2 120 condensing boilers VFO Flow Sensor AF Outside Sensor Sensor/ Stat RFO Return Sensor Low Loss Boiler No.1 Boiler No.2 Header (if installed) Max Velocity 0.5 m/s...
  • Page 23 STRATA2 5.7.3 connection diagrams suggested wiring and component layout for multiple Strata 2 120 installations up to 960kW Outside Air Sensor System Flow Sensor Boiler Return Sensor HWS Sensor H1 Remote Enable (Volt Fee)/or 0-10 volt RVA 47 RVA 47...

  • Page 24: Electrical Wiring Diagram

    STRATA2 5.7.4 electrical wiring diagram pwm pls PUMP GAS VALVE IGM20 DU312 L PE N L PE N Heat- exchanger FURIMAT 310 L PE N FLOW 6,3AT SENSOR CONDENSE PUMP RVA47 (46) POWER SUPPLY WATER EXHAUST CONDENSE LEVEL FLOW WATER SENSOR Frame at the top...

  • Page 25: Connecting Additional Boilers

    STRATA2 5.7.5 connecting remote fault alarms The boiler includes a normally open volt free contact for each module, which closes in the event of a lockout failure. See “Electrical Connection Details” section 5.7. 5.8 connecting additional boilers A second boiler unit does not require an additional RVA 47 manager, as the manager in the first unit is capable of controlling up to 4 burners.
  • Page 26 The condensate pump (KHP1) must be wired into this plug once the link wire has been removed. condensate receptacle & pump model No. KHPI Blue - Neutral Strata 2 Condense KHPI Pump Plug Remove Link Brown 230V Live “out”...

  • Page 27: Technical Data

    Strata 2. The KHP1 may be installed directly inside the base area of the Strata 2 making a concealed installation. The receptacle includes a permanently wet sump area where pH adjustment granules may be dosed to neutralise the pH of the condensate water.

  • Page 28: Appliance Operation

    STRATA2 6.2 appliance operation A Double pole on/off switch (main) F Lower burner status panel B Lower burner on/off switch G Upper burner status panel C Upper burner on/off switch H RVA 47 cascade control manager D Fuse holder Knockout for additional optional controls E Altitude gauge Fig 6.2a...

  • Page 29: Dip Switches

    STRATA2 6.2.3 DIP switches The unit has a number of DIP switches that must always be set. These switches have different functions. To access the DIP switches, the cover plate over the circuit boards must be removed. 1. Remove the two fixing screws on the lower edge of the top cover panel. 2.

  • Page 30: Initial Start-Up

    STRATA2 6.3 firing the appliance At the time of starting the appliance, the working gas pressure must be measured: The inlet working gas pressure must be measured at the inlet test nipple of the gas control valve. (see fig 6.4a). Nominal pressure should be 20 mbar for the Natural gas and 37 mbar for LPG (Propane).

  • Page 31: Setting Minimum/Maximum Load

    STRATA2 6.4.1 setting minimum load gas valve To set the minimum load refer to figure 6.4a and follow the instructions below: Press the ‘Chimney Sweep’ button once, the letter ‘L’ will appear in the display and the unit Q max will commence operation at minimum capacity, for up to 10 minutes.

  • Page 32: Switching Off The Appliance

    STRATA2 6.6 setting domestic hot water The RVA 47 cascade manager can be set to control the temperature of the DHW either by means of a dedicated sensor or thermostat. 6.7 switching off the appliance It is recommended to leave the appliance running throughout the year in order to prevent the unit from freezing, or moving parts from becoming blocked by corrosion.

  • Page 33: Heating Engineer Parameter Setting

    STRATA2 7.1 end user parameter settings (contd) Table 10 (Prog#) Description of Prog # Range Inputs Preset Actual Values Actual room temperature – – Actual outside temperature -50. +50 ºC – – (Pressing the + and – buttons simultaneously until the display stops flashing will reset the averaged value) Maintenance...
  • Page 34 STRATA2 7.2 heating engineer parameter setting (contd) Table 11 (Prog#) Description of Prog# Range Preffered Setting Service Values Output test 0…3 0 Automatic control 1 All outputs off 2 DHW pump/valve on 3 Circulating pump on Input test 0 Return temperature value 1 DHW temperature value 2 Flow temperature value 3 Outside temperature value...
  • Page 35 STRATA2 7.2 heating engineer parameter setting (contd) Table 11 (Prog#) Description of Prog# Range Preffered Setting Space Heating Displacement of heating curve -4.5..+4.5 Gain factor for room temperature influence 0..1 0 Active 1 Inactive Room temperature pump switching differential – – –/0.5..4 Higher = Less stable temperature Lower = More stable temperature Minimum limitation of flow temperature...
  • Page 36 STRATA2 7.2 heating engineer parameter setting (contd) Table 11 (Prog#) Description of Prog# Range Preffered Setting LPB communication setting LPB control device address 0..16 0 Standalone single RVA 47 1 Master RVA 47 cascade manager with sensors attached 2…16 Slave RVA 47s operating from master RVA 47 (ie House No.) (Each subsequent RVA 47 should be given consecutive numbers) LPB control segment addres...
  • Page 37 STRATA2 7.3 OEM parameter setting To enter the OEM Parameter Program, the door of the RVA 47 must be opened and the UP and DOWN Prog buttons must be depressed for at least 10 seconds until 00000 appears in the window. The 00000 display must be changed to 11111 by inputting a password.

  • Page 38: Maintenance

    STRATA2 7.3 OEM parameter setting (contd) Table 12 (Prog #) Description of Prog # Range Preferred setting Minimum output % reached prior to 5..100 cascade switching modules Off Maximum output % reached prior to 5..100 cascade switching modules On Time spent by module on ignition rate prior 0..1200 to modulation.

  • Page 39: Operation Indicator

    The control panel is divided into two sections, the left hand section serves the lower heat exchanger and the right hand section serves the upper heat exchanger. The two digital displays provide the following information regarding the functioning of the Strata 2-120: Normal operating situations, the display always shows the flow temperature of the boiler water.

  • Page 40: Fault Indicator

    STRATA2 9.1.1 operation indicator (contd) 2. Unit prevented from operating. Water temperature too high, measured by the flow sensor. When the water temperature drops by more than 20ºC the unit will start to operate. 3. Unit prevented from operating. Anti-cycling time. When the anti-cycling time (3 minutes has expired, the unit will automatically fire up again).

  • Page 41: System Faults

    STRATA2 9.1.3 system faults These faults are indicated with a letter, occasionally followed by a number. To avoid confusion in the indication, the letters and numbers are fixed as follows: Table 15 Fault with flow sensor Fault with cable for gas valve or gas valve coil Fault with rectification circuit Burner control circuit board has a fault –...

  • Page 42: Parts List

    STRATA2 10.0 parts list The Parts List is for service purposes. If no numbers have been listed, the parts concerned are non serviceable parts. Short spaces parts list: Description of Part Part Number Water temperature sensor 252014 Limit thermostat 250083 252013 Pump 130160...
  • Page 43 QW/04/01 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 http://www.modular-heating-group.co.uk 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.

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