MHS Boilers STRATA1, STRATA1 60, STRATA1 45, STRATA1 70 Instructions Manual

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WALL MOUNTED, GAS FIRED,

ULTRA HIGH EFFICIENCY CONDENSING BOILER INSTRUCTIONS FOR INSTALLATION, SERVICING

& OPERATION FOR MODELS 45, 60 & 75

STRATA1

L 102

STRATA1

Index

page section

. . . . . . . . . . . . .

1.0

General Notes

4-5

. . . . . . . . . . . .

2.0

Product Description

. . . . . . . . . . . . .

3.0

Technical Data & Dimensions

. . . . . . . . . . . . .

4.0

Delivery Consignment/Unpacking The Boiler

. . . . . . . . . . . . . .

5.0

Boiler Location

. . . . . . . . . . . . . .

6.0

Installation Clearances

. . . . . . . . . . . . .

7.0

Wall Mounting

. . . . . . . . . . . . . .

8.0

Gas Connection

. . . . . . . . . . . . .

9.0

System Flow & Return Connections

. . . . . . . . . . . . . .

10.0

Condense Waste Connection

. . . . . . . . . . . .

10.0

Condense Waste Connection (contd)

. . . . . . . . . . . . . .

11.0

Flue Combustion Air Connection - General

. . . . . . . . . . . .

12.0

Conventional Flue Installation

12-18

. . . . . . . . . .

13.0

Room Sealed Flue Installations

. . . . . . . . . . . .

14.0

Examples of Calculating Flue Pressure Loss

. . . . . . . . . . . .

14.1

Calculating Flue Resistance

20-21

. . . . . . . . . .

15.0

Flue Terminal Positions

22-23

. . . . . . . . . .

16.0

Ventilation Requirements Single Appliances

24-32

. . . . . . . . . .

17.0

Hydraulic system Design (circuit diagrams)

. . . . . . . . . . . .

17.1

Filling The System

. . . . . . . . . . . . . .

17.2

Water Treatment System Cleaning

. . . . . . . . . . . .

17.3

Inclusion of Strainers

. . . . . . . . . . . . . .

17.4

Low Water Pressure Protection

. . . . . . . . . . . . . .

17.5

Care With The Use of Soldering Flux

. . . . . . . . . . . . . .

18.0

Electrical Connections

35-43

. . . . . . . . . .

18.0

Electrical Connections (contd)

44-45

. . . . . . . . . .

18.1

Optional Matched controls

. . . . . . . . . . . .

18.2

0-3/0-10 Volt Control

. . . . . . . . . . . . . .

19.0

Commissioning The Strata 1 Boiler

. . . . . . . . . . . .

19.1

Pre-Commissioning Checks

. . . . . . . . . . . . . .

19.2

LPG Conversion Procedure

. . . . . . . . . . . . . .

19.3

First Firing

. . . . . . . . . . . .

19.1.1

Dip Switch Settings

. . . . . . . . . . . .

19.3

First Firing (contd)

. . . . . . . . . . . .

19.3

First Firing (contd)

50-52

. . . . . . . . . .

19.4

Setting Weather Compensation

. . . . . . . . . . . .

19.5

Setting Domestic Hot Water Temperature

. . . . . . . . . . . . . .

19.6

Service Button/Setting Heating Output

. . . . . . . . . . . .

19.6

Service Button/Setting Heating Output (contd)

. . . . . . . . . . . . . .

19.7

Output For Charging Hot Water

. . . . . . . . . . . . . .

20.0

Setting The Boiler To Work

. . . . . . . . . . . .

21.0

Servicing Instruction

. . . . . . . . . . . . . .

21.1

Inspection

55-56

. . . . . . . . . .

21.2

Maintenance

57-59

. . . . . . . . . .

22.1

Screen Display/Diagnosis Of Faults

59-60

. . . . . . . . . .

22.2

(Possible) Causes Of Fault & Corrective Action

. . . . . . . . . . . .

23.0

Instructing The User

. . . . . . . . . . . . . .

23.1

To Turn On the Appliance

. . . . . . . . . . . . . .

23.2

To Turn Off the Appliance

. . . . . . . . . . . .

24.0

Strata 1 45, 60, 75 Expploded View

1.0 general

notes

STRATA1

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. Corgi Registered. This manual must be handed to the appliance user following completion of the installation.

conformity statement

Strata 1 45, 60, & 75 boilers are manufactured to the highest standard of quality, performance and safety, in accordance with EC standards. Strata 1 45, 60 & 75 boilers carry the CE mark.

installation requirements

The installation of Strata 1 45, 60 & 75 boilers must be in accordance with the relevant requirements of Gas Safety (Installation and Use) Regulations 1994, Health & Safety at Work Act, Building Regulations, I.E.E. Regulations, Construction (Design & Management) Regulations 1994, Local Authority Bye-Laws, Local and National Water Bye-Laws, Fire Authority Regulations and Insurance Company requirements.

The following Codes of Practice are also applicable:-

• BS6798: 1987 Specification for installation of gas fired hot water boilers of rated input not

exceeding 60kW.

• BS6880 Code of Practice for low temperature, hot water heating systems of output greater than

45kW. Parts 1, 2 and 3: 1988.

• CP342 Part 2: 1974 Code of Practice for centralised hot water supply.

• BS5440-1:2000 1991 Specification for gas fired hot water boilers of rated inputs between 60kW

and 2MW.

• IGE/UP/2 Gas installation pipework, boosters and compressors on industrial and

commercial premises.

• CIBSE Guide Reference sections B7, B11 and B13.

• BS5440-1:2000 - Installation of flues and ventilation for gas appliances of rated input not exceeding

70kW nett (1st, 2nd and 3rd family gases). Part 1: Specification for the installation of flues.

• BS5440-2: 2000 Installation and maintenance of flues and ventilation for gas appliances of rated input

not exceeding 70kW nett (1st, 2nd and 3rd family gases) Part 2: Specification for installation and

maintenance of ventilation for gas appliances.

• IGE/UP/10 Installation of gas appliances in industrial and commercial premises.

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.

fully modulating heat output

The output of the boiler is fully variable, sliding between (approx.) 20% to 100%, which automatically and instantly adjusts to match the needs of the system. The percentage of power at any given time can be dictated by either outside air temperature, flow temperature, return temperature, stored domestic hot water temperature, or room temperature, or a combination of the aforementioned.

fully condensing stainless steel heat exchanger

The Strata 1 boiler is designed with extended heat exchange surface area and is fabricated from corrosion resistant long-life stainless steel. The unique Spiranox heat exchanger will return operating efficiencies from 86% gross (96% nett) at 60°C return temperature, up to 97% gross (107% nett), at 30°C return temperature.

extremely low harmful emissions

The boiler utilises 100% pre-mix gas/air fed at positive pressure to the metal fibre sheathed radiant burners. The combustion system incorporates internal flue gas re-circulation and this combined with the precise nature of pre-mix fuel/air control, gives ultra low emissions to satisfy the most stringent emission regulations in the world currently. That is: < 20mg/kWh NOx (14 ppm DAF) and < 14mg/kWh CO (13 ppm DAF). The fully modulating nature of the appliance also reduces emissions by avoiding repeated start/stops and the associated increase in emissions, which occurs with burner on/off cycling.

accurate variable burner output control

The pre-mix burner fans have low voltage direct current drive motors with pulse relay counting. This system allows precise control over fan speed/combustion air volumes. Coupled with a gas valve system set to provide proportionately measured volumes of fuel to air, which allows extremely accurate and instant variable burner output control to be achieved.

energy saving

In addition to the extremely efficient burner and heat exchanger system employed in the Strata 1, each appliance includes modulating speed boiler primary pumps.

This feature allows the boiler to self-maintain a 20°C ∆t across the heat exchanger, optimising the heat exchanger efficiency and reducing also the electrical consumption of the pump motors. The result is a seasonal increase in boiler efficiency of a further 7-10% and a reduction in pump electricity consumption of up to 70%.

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. Management of the essential safety functions of burner ignition and flame monitoring.

2. Water high temperature and flue gas high temperature safety cut out.

3. Modulation of the boiler output and pump speeds in conjunction with operating temperature control.

4. LCD display screen with two lines of text to continuously display operational or fault status.

5. In built weather compensator to provide direct-on boiler VT flow temperature (if required).

6. Remote stored hot water temperature control.

7. In built 2 stage boiler frost protection program.

8. In built pump exercising program to avoid standstill seizure.

9. Cold start boost facility.

10. PC compatibility with data logging which allows communication with the boiler via a lap-top computer to review/modify operational parameters and access operational history as an aid to fault finding and preventative maintenance.

11. Range rate adjustment which allows the power to be set to accurately match the maximum needs of the system, with the facility to set a different firing rate for heating. Output to hot water self adjusts to the heat transfer capability of the calorifier.

12. Facility to connect optional matched control components which allow the boiler to control a heating circuit pump, (PR01) HWS primary pump or diverter valve and an underfloor circuit mixing valve and pump (MR03), plus the ability for the boiler to be controlled by a remote multi function modulating room unit (RE2132). Multiple boilers may be connected to a modulating Kaskade manager (KKM2) or controlled via a 0-3 or 0-10v * signal (*via adaptor) which further enhances the operating efficiency of a larger load modular boiler system.

room sealed option

If required, the boiler may be installed to be completely room sealed, taking combustion air directly

from outside the building, using a 125/80 concentric air duct/flue duct system. Inherent safety is afforded by the negative pressure within the boiler casing, which in the event of incorrect sealing results in safe inward air leakage only.

extended flue lengths

The excess fan pressure from the combustion system is 100 Pa, which allows the appliance to be

exhausted using small diameter PPS plastic flue components, over long distances, allowing for complete flexibility in boiler siting.

designed for ease of maintenance

Although compact, the Strata 1 does not compromise serviceability. The appliance has been engineered

to be easy to maintain with even the most major of service operations being able to be completed easily and quickly with the minimum of tools.

guarantee

The heat exchanger carries a five year guarantee against manufacturing or material defect. All other

parts carry a one year warranty against manufacturing or material defect.

STRATA1

3.0 technical data

& dimensions

Model Strata 1 Nominal Heat Input Nett (max) kW Nominal Heat Output 80/60°CkW Nominal Heat Output 50/30°CkW Input Rate Nat Gas (max) m

Input Rate LPG G31 (max) m

/h Minimum/Maximum Gas Pressure mbar Flue Gas Volume (Hot) m

/h Pressure at Flue Outlet Pa Maximum Working Pressure Bar Minimum Working Pressure Bar Maximum Flow Temperature °C Power Supply V Fuse Rating A Average Power Consumption Watts Water Content L Weight (Dry) kg Design ∆t °C

45 43

41.3

45.2

4.7

1.76

18/60

100

3.0

0.5 85

230

3.0

115

6 60 20

60 57

54.7

59.9

5.9

2.33

18/60

100

3.0

0.5 85

230

3.0

115

7 66 20

75 72

69.1

75.6

7.6

2.95

18/60

104 100

3.0

0.5 85

230

3.0

115

8 73 20

108

229

458

231

435

123

950

front - all models

plan - models 45/60/75

125 67 8

108

193

238

underside - models 45/60/75

pH of Condense Water 4 to 5.5

Connection Strata 1

1. Return

2. Flow

3. Flue Gas (OD)

4. Air Duct (OD)

5. Condense Syphon Cleaning Point (capped)

6. Condense Waste

7. Cable Entries

8. Gas

45 11/4" BSP-M 1

/4" BSP-M

80mm

125mm

/4" BSP

/4" BSP-M

60 11/4" BSP-M 1

/4" BSP-M

80mm

125mm

/4" BSP

/4" BSP-M

75 11/4" BSP-M 1

/4" BSP-M

80mm

125mm

/4" BSP

/4" BSP-M

Multiple Grometts

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” x 11/4” x 1/2” BSP Tees, 2Nr 11/4” x 1/2” BSP reducing sockets,

1Nr 3/4” BSP Inlet x 1” BSP outlet safety valve set 3.0 bar, 1Nr 3/4” x 1/2” BSP reducing nipple (for safety valve inlet) and 1Nr outside air temperature sensor.

To unpack the boiler, the palleted carton should be laid on the floor. Carefully cut the nylon bands and lift away fibre board protective panel. Open carton top and lift out wall hanging bracket and fittings bag. Remove packing material and lift away bottomless carton. With 2 men, carefully lift boiler from palette by holding grey rear chassis only.

To remove the casing from the boiler, slacken the screw in the underside of the casing, unlatch left and right hand catches on underside of case, pull casing slightly to the front and lift upwards to disengage casing hooks from rear chassis and then remove casing to the front.

5.0 boiler

location

The Strata 1 Boiler is not suitable for installation external to a building. The position chosen for the boiler must be a structurally sound wall capable of supporting the weight of the boiler and any ancillaries. The position should allow for access to a condense waste drain nearby or an alternative is to install a condense sump receptacle and condense disposal pump which should remove the condense waste water to a remote drain. The wall mounting position of the boiler must allow the boiler to be true plumb vertical to ensure correct operation of the internal gravity flow condense system. The position for the boiler must satisfy the requirements of BS6798:1987 or BS6644:1991.

6.0 installation

clearances

For ease of installation, commissioning and maintenance the following minimum clearances should be observed:-

Sides 50mm Above 250mm Below 150mm Front 450mm

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. The wall mounting bracket positioning detail is shown in fig 1. The boiler must be carefully offered up to the wall so that the rail on the rear of the boiler is just above the wall mounting bracket and then the boiler should be lowered to engage the bracket and rail. Lifting is advised with 2 persons. Do NO

T lift the boiler by the

internal parts of the appliance.

important Note

When viewed from the side, the north/south axis of the boiler must be vertical. The appliance must not be inclined out from the top, if necessary block or shim behind the bottom rear of the boiler to achieve a vertical installation.

8.0 gas

connection

The gas connection is located at the base of the appliance rear r/h side, see fig 2.

The pipe size used to supply the appliance must not be smaller than the gas connection size on the appliance.

The connection to the appliance must include a suitable method of disconnection and a gas control cock must be installed adjacent to the appliance for isolation purposes.

The gas pipe used to supply the appliance must not allow a pressure drop of greater than 1m bar from the meter to the appliance.

The nominal inlet working gas pressure measured at the appliance should be

20.0 mbar for Nat Gas (G20) or 37 mbar for LPG (G31).

A gas pressure test point should be installed between the gas control cock and the appliance, so that nominal inlet gas pressure test can be undertaken.

Gas Connection

/4" BSP Male

Fig 2.

Fig 1.

3 x ø 7.0

170

458

165

170

735 900

STRATA1

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. It is recommended that the final working pressure (hot) of the system does not exceed 2.3 bar.

The boiler is equipped with 2 sets of 1

/4" BSP Male flow & return connections which are located top

rear L/h side & bottom rear L/h side. See figs 3&4.

The installer may choose to use both top connections or both bottom connections or one of each (e.g. flow-top, return-bottom). The appliance is supplied complete with 2Nr 1

/4" x 1/2" BSP reducing sockets

(see fig 3. item A) which may be used either at the top of the appliance (when flow and return connections are made to the lower boiler connections) to install air vents or be used at the bottom flow and return connections (when system connecting are to the top of the appliance) to install drain cocks.

The appliance is supplied with 2Nr 1

/4" x 1 1/4" x 1/2" BSP Tees (see fig 4. item B) which may be used

to connect the supplied safety valve into the flow pipe adjacent to the appliance and either a system filling point/expansion vessel or a draincock. The flow and return pipework should include isolation values and a method of disconnection local to the boiler.

9.0 system flow

& return connections

10.0 condense

waste connection

Return

Fig 3.

Fig 4.

Flow

Return

The condense waste connection is located at the underside rear of the appliance see fig 5. The condense syphon cleaning point is factory fitted with a heavy grade black plastic cap which MUST NOT BE REMOVED (see fig 5) apart from routine maintenance cleaning operations and must be in place whenever the appliance is in operation. WARNING operating the appliance with the cap removed from the syphon cleaning point will cause products of combustion to be discharged from the cleaning point.

The condense waste connection is a

/4" BSP Male threaded stub fabricated from

plastic. The installer must connect to this stub, a condense waste pipe fabricated from plastic tube and fittings (

/4", 22mm, overflow pipe is considered suitable).

Copper Tube is not acceptable. The condense waste pipe must fall continuously from the appliance to suitable nearby drain.

STRATA1

10.0 condense waste connection (contd)

If any part of the condense waste pipe is to be run external to the building or is at risk of freezing, then the pipe must be suitably insulated to protect from freezing.

If a suitable drain for accepting the condense waste is not available nearby to, and below the boiler, (e.g. boiler installed in a basement below ground level location), then a suitable condense sump receptacle with a discharge pump should be installed below the boiler to remove the condense to a remote drain.

When making the condense waste pipe connection to the boiler, do not use adhesives, it is recommended to lightly apply a suitable jointing tape (PTFE or similar) and use only light pressure to connect fittings to the appliance to avoid damage to the condense waste outlet assembly.

It is recommended that the condense waste pipework should include a method of disconnection and cleaning points.

11.0 flue/combustion

air connection - general

The flue connection and combustion air inlet to the appliance are located on the top of the appliance see fig 6. These connections are arranged concentrically with the 80mm flue gas connection centrally within the 125mm air inlet connection. There are two options for flueing the Strata 1 boiler.

i) Conventionally, using flue gas tube only and air for combustion from the room or compartment in which the appliance is installed. If using a conventional flue arrangement then the room or compartment must be ventilated in accordance with the requirements of BS 6644 or BS5440 as appropriate. For guidance on ventilation see section 16.

ii) Room sealed using concentric 80/125 components or two seperate tubes where air for combustion is taken from outside of the building. When using a room sealed flue, where air for combustion is provided from outside of the building directly to the appliance, ventilation to a compartment may still be required - 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.

typical modular

flue arrangement

Inspection Area

Air Inlet

Flue gas Connection

Fig 6.

Condense Waste Connection

Syphon Cleaning Point MUST

remain capped

Fig 5.

STRATA1

12.0 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.

The flue should be installed to have at least a 3˚ fall to the boiler to allow any condense formed in the flue to run back to the boiler.

The flue system used must be gas and water tight and must be adequately supported over it’s entire length. Support at 1 metre intervals. It is not necessary to install a terminal to the flue system, however, a mesh guard should be included to prevent blockage or entry of foreign material. Straight lengths may be cut to size with any surplus cut from the plain end. Tube ends should be cut square and de-burred.

Care should be taken when selecting a position for a low level discharge or discharge adjacent to windows etc as the flue terminal will plume heavily and the white water vapour discharge may cause a visual nuisance.

Flue components available from MHS Boilers Ltd.

80 mm PPS Flue Tube x 1000 mm long (effective length 945 mm) 80 mm PPS Flue Bend x 90° 80 mm PPS Flue Bend x 45° 80 mm Wall Fixing Bracket - Aluminium 80 mm Bird Mesh Cap - Plated Steel

The above flue components are light grey self coloured Polypropylene moulded components with push together spigot and socket joints with integral seal ring located in the socket.

If fire stop seals are required to be installed where PPS plastic flue components pass through walls, floors or ceilings then suitable fire stop seals are available from:-

Nullifire Ltd

Torrington Avenue

Coventry CV4 9TJ

Tel 02476 855000

Fax 02476 469547

Dufaylite

Developments Ltd

Cromwell Road, St Neots

Huntingdon PE19 1QW

Tel 01480 215000

Fax 01480 405526

Quelfire

PO Box 35, Altrincham

Cheshire WA14 5QA

Tel 0161 928 7308

1000 mm

Effective Length 945mm

137

125

ø80

100

150

80 ø PPS Flue Tube x 1000 long

80 ø PPS Flue Bend x 90º

80 ø PPS Flue Bend x 45º

80 ø Wall Fixing Bracket

ø5 Woodscrew fitting

100 mm PPS Flue Tube x 1000 Long (Effective Length 945 mm) 100 mm PPS Flue Bend x 90° 100 mm PPS Flue Bend x 45° 100 mm Wall Fixing Bracket 100 mm Bird Mesh Cap - Plated Steel 80 x 100 mm Increaser

80 ø PPS Flue Components

100 ID

150

80 x 100 PPS Increaser

End Slip

STRATA1

13.0 room sealed

flue installations

The Strata 1 boiler has an excess pressure combustion system, which coupled with the very low flue gas temperatures produced allows the appliance to be exhausted and supplied with room sealed combustion air using a concentric flue arrangement of 80 mm PPS polypropylene flue pipe within a 125 mm outer painted metal air tube over considerable distances. 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.

The concentric flue system should be installed to have at least a 3° fall to the boiler to allow any condense formed in the flue to run back to the boiler.

The flue system must be gas and water tight and must be adequately supported over it’s entire length. Support at 1.5m intervals. Horizontal Discharge and Vertical Discharge Terminal Sets are available.

Concentric flue components have push together spigot and socket joints. The inner PPS flue gas tube has seal rings located in the socket component. The outer air tube has EPDM rubber seal rings located in the socket component.

To aid assembly and assurance that the joints have been fully pushed home, the seal rings and make ends of tubes/fittings should be lightly lubricated with silicone grease.

list of concentric flue components

● 80/125 Concentric wall terminal set:- comprises 500 mm (845 mm*) straight length with made on

terminal, 90° concentric bend and wall bezel plates.

● 80/125 Concentric roof terminal set:- comprises 1000 mm straight length with made on terminal and

1Nr 125 wall bracket.

● 125 pitched roof tile flashing for use with concentric roof terminal set, adjustable between 25° to 50°.

● 125 flat roof flashing for use with concentric roof terminal set.

● 80/125 Concentric flue tube set x 1000 mm.

● 80/125 Concentric flue tube set x 500 mm.

● 80/125 Concentric 93° Bend.

● 80/125 Concentric 45° Bend.

● 125 Wall bracket assembly.

● 80/125 Concentric Vertically Extendable Discharge Room Sealed Wall Terminal Assembly - For use

where a standard wall terminal may cause visual flue gas pluming nuisance. Includes 90° Concentric

bend, wall bezel plates and silicone mastic. Used in conjunction with additional 80 mm pps flue gas tube

and fittings listed on page 10.

● 80/125 Concentric to 2 x 80 mm Separate Tubes Adaptor.

● 80/125 to 100/150 Concentric Increaser (Not Shown).

● 100/150 Concentric Wall Terminal (Not Shown).

● 100/150 Concentric Roof Terminal (Not Shown).

● 100/150 Concentric Flue Tube Set x 1000 mm (Not Shown).

● 100/150 Concentric Flue Tube Set x 500 mm (Not Shown).

● 100/150 Concentric 93°C Bend (Not Shown).

● 100/150 Concentric 45°C Bend (Not Shown).

STRATA1

13.0 room sealed flue installations (contd)

497

1000

Effective Length 950 mm

994

Effective Length 450mm

125

110

178

ø 7mm "Drive In" Fixing C/W Wall Plug

125

110

125

93º

80/125 Concentric Tube x 500mm

80/125 Concentric Bend x 45º

ø125 Wall Fixing Bracket

80/125 Concentric Tube x 1000mm

80/125 Concentric bend x 93º

491

80/125 concentric roof terminal & accessories

80/125 Concentric Roof Terminal Assembly

125

1170

513 513

130

390

500

Circular 125 Spun Aluminium Flat Roof Flashing

Pitched Roof Flashing - Adjustable 25-38º & 37-50º

125 Pitched Roof Adjustable Flashing. Adjustable between 25-38º and 37-50º

Lead Apron 1.3mm

458

229

355178900

155

120

80 80

plan

80/125 Concentric to 2 x 80 mm Tubes Adaptor

Flue Gas

Air for

Combustion

STRATA1

13.0 room sealed flue installations (contd)

installation of standard wall terminal with side outlet

In order to determine the length of concentric tube required to correctly terminate a side outlet arrangement, the following procedure should be followed:

1. Measure wall thickness W in mm - see fig 7.

2. Measure distance between side of appliance and inside face of wall L1 in mm see fig 7.

3. Mark off and cut flue tubes following guidance show in fig 8 below. Flue tubes should be cut to length

TL in mm. Both inner and outer tubes should be cut flush with each other, square and any

burrs removed.

Where TL required, is greater than 845 mm, then additional lengths (as appropriate) of 80/125 concentric tube will be required to extend the standard wall terminal. A fall of 3˚ is required along the length of the flue towards the appliance.

Concentric Wall Terminals

945

610

850*

845

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)

* From 01/10/00

Note: 3˚ fall towards appliance required if additional lengths are used

ø125

ø80

ø125

ø80

Detail For Marking Out For

Cutting Flue Hole For Side Flue,

Room Sealed Horizontal

Arrangement

Cut Flue Hole ø 130mm

Line-Top of

Appliance C

hassis

˚ fall to

appliance)

231

170

Fig 9.

Side Outlet

170

Plain Section Installed Uppermost

Wall Bezel Plates

Required Length Cutting Line

measure from this point

TL (mm)

TL = W+L1+235mm

Fig 7.

Fig 8.

STRATA1

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. Mark off and cut flue tubes following guidance shown in fig 11 below.

Flue tubes should be cut to length TL in mm. Both inner and outer tubes should be cut flush with each

other, square and any burrs removed.

13.0 room sealed flue installations (contd)

Rear Outlet

170

Fig 10.

Plain Section Installed Uppermost

Wall Bezel Plates

Required Length Cutting Line

measure from this point

TL (mm)

TL = W+237mm

Fig 11.

170

cut flue hole ø130

Fig 12.

Detail For Marking Out For Cutting Flue Hole For Rear Flue, Room Sealed Horizontal Arrangement

STRATA1

13.0 room sealed flue installations (contd)

Extending the flue gas discharge vertically away from a room sealed wall terminal.

The Strata 1 boiler is a fully condensing appliance with very low flue gas temperatures.

Consequently, the flue gas discharge is commonly seen as a white vapour plume, Whereas this is not harmful when properly discharged into the atmosphere outside of a building from a correctly operating appliance, the white vapour plume may cause, in certain applications a visual nuisance.

It must also be considered that a flue termination will drip condense water and may cause an ice hazard below the terminal position

If it is considered that pluming or dripping from the end of a standard wall terminal may create a nuisance, then as an alternative, the vertically extendable discharge wall terminal is available see figs 14 and

16. This creates a local room sealed intake for combustion air but allows the installer to extend the 80 mm PPS flue gas tube to a point where pluming or dripping discharge will not cause a visual nuisance or hazard.

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. Slip flue tube and terminal assembly through the prepared hole in the outside wall.

3. Locate wall bezel plate loosely onto the 125mm rear tube

4. Lubricate male ends of concentric flue tube and female sockets of flue bend lightly with silicone grease. Insert concentric tubes into bend and gently push fully home. Ensure plain section of external part of air inlet tube is located uppermost.

5. Make good internally and externally gap between air tube and prepared hole through wall.

6. Slip on external wall bezel plate.

7. Fix internal and external wall bezel plates with fixings provided.

Where a flue terminal discharges through a wall is within 2m of ground level or balcony etc then

the terminal should be fitted with an appropriate sized terminal guard.

Installation of Vertical Discharge Wall Terminal with side outlet

In order to determine the length of concentric tube required to correctly terminate a side outlet

extended vertical discharge arrangement, the following procedure should be followed.

1. Measure wall thickness W in mm - see fig 14 overleaf.

2. Measure distance between side of appliance and inside face of wall L1 in mm - see fig 14 overleaf.

3. Mark off and cut flue tubes following guidance shown in fig 15 overleaf. Flue tubes should be cut to

length TL in mm. Both inner and outer tubes should be cut flush with each other, square and any burrs removed.

Where TL required, is greater than 610 mm, (*850mm) then additional lengths (as appropriate) of

80/125 concentric tube will be required to extend the vertical discharge wall terminal. A fall of 3˚ is required along the length of the flue towards the appliance.

method of assembly of horizontal concentric flue system using standard wall terminal.

Fig 13.

Plain Section Uppermost

STRATA1

Installation of Vertical Discharge Wall Terminal With Rear Outlet

In order to determine the length of concentric tube required to correctly terminate a rear outlet

extended vertical discharge arrangement, the following procedure should be followed.

1. Measure wall thickness W in mm - see fig 16.

2. Mark off and cut flue tubes following guidance shown in fig 17 below.

Flue tubes should be cut to length TL in mm. Both inner and outer tubes should be cut flush with each

other, square and any burrs removed.

Where TL required is greater than 610 mm, (*850mm) then additional lengths (as appropriate) of 80/125 Concentric tube will be required to extend the vertical discharge wall terminal. A fall of 3˚ is required along the length of the flue towards the appliance.

* available 01/10/00

Installation of Vertical Discharge Wall Terminal With Side Outlet

Rear Outlet

Fig 16.

170

ø80 PPS 90º Bend

ø80 Bird Mesh

ø80 PPS Tube

Exhaust Outlet Installed vertically Upwards on Some Wall Aspect

Wall Bezel Plates

Fig 17.

Required Length Cutting Line

measure from this point

TL (mm)

TL = W+262mm

Side Outlet

Fig 14.

170

ø80 PPS 90º Bend

ø80 Bird Mesh

ø80 PPS Tube

Exhaust Outlet Installed vertically Upwards on Some Wall Aspect

Wall Bezel Plates

Fig 15.

Required Length Cutting Line

measure from this point

TL (mm)

TL = W+L1+260mm

STRATA1

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. Slip flue tube and terminal assembly through prepared hole in the outside wall.

3. Locate internal wall bezel plate loosely onto air tube.

4. Lubricate male ends of concentric flue tubes and female sockets of flue bend lightly with silicone grease. Insert concentric tubes into bend and gently push fully home. Ensure flue gas discharge is positioned vertically upwards.

5. Made good internally and externally gap between air tube and prepared hole through wall.

6. Fit external 2 piece wall bezel and secure both internal and external wall bezels using fixings provided.

7. Seal air tube to exhaust discharge with a bead of silicone rubber mastic (mastic supplied) to create weather seal to avoid entry of rain water into air tube.

8. Extend flue gas discharge to chosen position using 80 mm PPS flue tube fittings.

Extend using 80ø

PPS tube

Flue discharge

vertically upwards

on some wall aspect

Fig 18.

Method of assembly of extendable vertical discharge wall terminal assembly.

STRATA1

14.0 examples of calculating

flue pressure loss

50 100 200150 250 300 350 400 450 500

Strata 1 - 75

Strata 1 - 60

Strata 1 - 45

0 2 6 10 14 18 22 26 30 34 38

110

130

100

120

140

48 1612 20 24 28 32 36 40

example 1

A Strata 1-60 boiler is installed with a concentric flue system which takes an all horizontal route to a wall terminal. Length of flue = 3m including one 90° bend.

Resistance = 3 x 1m length 80/125 concentric tube @ 8.5 Pa = 25.5 1 x 90° 80/125 concentric bend @ 8.5 Pa = 8.5 1 x 80/125 concentric wall terminal @ 11.0 Pa = 11.0

Total Resistance = 45 Pa

conclusion: Total resistance is less than 100 Pa, therefore, no alternative design required and no effect on boiler output, or positioning required.

example 2

A Strata 1-45 boiler is installed with a concentric flue system which takes a part horizontal, part vertical route to a roof terminal with rain cap.

Length of horizontal section = 3m, vertical section = 12m, system includes 3x90° bends.

Resistance = 15 x 1m lengths 80/125 concentric tube @ 5.5 Pa = 82.5 3 x 90° 80/125 concentric bend @ 5.5 Pa = 16.5 1 x 80/125 roof terminal @ 11.25 Pa = 11.25

Total Resistance - 110.25 Pa

Take into account that 12m of vertical (assume uninsulated, as air for combustion direct from outside air surrounds the flue gas tube) flue creates 20 Pa of up-draught, then final resistance = 110.25 - 20 = 90.25 Pa.

conclusion: Final operating resistance is less than 100 Pa, therefore, no alternative design required and no effect on boiler output.

example 3

A Strata 1-75 boiler is installed (non room sealed) with a proposed flue using DN 80 PPS single skin flue components which takes a part horizontal, part vertical route to a vertical open termination with bird mesh.

Length of horizontal section = 4m, length of vertical (uninsulated) section = 11m with 4 x 90° bends, and 2 x 45° bends.

Resistance = 15 x 1m lengths DN 80 PPS tube @ 8.0 Pa = 120 4 x 90° DN 80 PPS bends @ 8.0 Pa = 32 2 x 45° DN 80 bends @ 4.0 Pa = 8.0 1 x DN 80 open termination @ 8.0 Pa = 8.0

Total Resistance: 168 Pa

Take into account that 11m of vertical un-insulated flue creates 18 Pa of up-draught, then final resistance would be 168 - 18 = 150 Pa.

Reference to the graph of resistance effect on boiler output shows the output would be reduced to approximately 67kW. If this is unacceptable, then the flue resistance must be re-calculated using a larger size flue tube as shown below or consideration given to moving the boiler position.

Re-calculating proposed flue installation using DN100. 15 x 1m lengths DN 100 PPS tube @ 3.0 Pa = 45 4 x 90° DN 100 bends @ 3.0 Pa = 12 2 x 45° DN 100 bends @ 1.5 Pa = 3.0 1 x DN 100 open termination @ 4.0 Pa = 4.0

Total Resistance: 64 Pa

Take into account thermal up-draught created (as before) 18 Pa. Therefore, operating resistance = 64 - 18 = 46 Pa, with no effect on boiler output.

thermal up-draught when

flue gas temp 80°C and outside temp -5°C

effect of flue system resistance

on boiler output

Draught - Pa

Vertical Flue Lengths - metres

A = Insulated or within the building B = Un-insulated and exterior to the building

Boiler Output kW at: Flow 80°C Return 60°C

Flue System Resistance - Pa

STRATA1

14.1 calculating

flue resistance

The excess pressure available for overcoming the frictional resistance of a flue system is 100 Pa.

The adjacent table of flue component resistances will assist the designer in calculating total flue system frictional loss.

If the total installed flue system resistance exceeds 100 Pa., then the result will be a reduction in boiler output. Reference to the “Effect of Flue System Resistance On Boiler Output”, graphs will assist. If the resistance of a proposed flue system has an unacceptable effect on boiler output, then a larger diameter flue tube should be selected.

Thermal up-draught is generated in a vertical flue system, reducing the resistance of the system. Reference to the “Thermal Updraught Graph” will provide a figure in Pa., which may be deducted from the total calculated flue system resistance.

NB. Thermal updraught does not apply to horizontal sections of a flue system.

If a flue terminal is positioned within 2 m above ground level or any upper part of a building where people have general access (e.g. balcony etc) then the terminal should be fitted with an appropriate guard.

The flue terminal of a Strata 1 boiler will plume heavily and care must be taken when selecting a terminal position to ensure that a "nuisance situation" is not created.

Component Resistance P.a.

45 60 75 80/125 Concentric Wall Terminal 7.5 11.0 16.0

80/125 Concentric Roof Terminal Without Rain Cap 7.5 11.0 16.0

80/125 Concentric Roof Terminal With Rain Cap 11.25 16.5 24.0

1m length 80/125 Concentric Tube 5.5 8.5 12.0

93° 80/125 Concentric Bend 5.5 8.5 12.0

45° 80/125 Concentric Bend 2.75 4.25 6.0

80/125 Concentric To 2 x 80 Tubes Adaptor 4.0 6.0 10.0

1m length DN 80 PPS Tube Carrying Fluegas 5.0 7.5 11.0

1m length DN 80 PPS Tube Carrying Combustion Air 3.0 5.0 7.0

90° DN 80 PPS Bend Carrying Fluegas 5 7.5 11.0

90° DN 80 PPS Bend Carrying Combustion Air 3.0 5.0 7.0

45° DN 80 PPS Bend Carrying Fluegas 2.5 4.0 5.5

45° DN 80 PPS Bend Carrying Combustion Air 1.5 2.5 3.5

Room Sealed Chimney Cap DN 80 7.0 10.0 15.0

DN 80 x 100 PPS Increaser Piece-Fluegas or Air 1.0 1.0 1.0

90° DN 100 PPS Bend Carrying Fluegas 2.0 2.5 4.0

90° DN 100 PPS Bend Carrying Combustion Air 1.5 2.0 2.0

45° DN 100 PPS Bend Carrying Fluegas 1.0 1.3 2.0

45° DN 100 PPS Bend Carrying Combustion Air 0.8 1.0 1.0

1m length DN 100 PPS Tube Carrying Fluegas 2.0 2.5 4.0

1m length DN 100 PPS Tube Carrying Combustion Air 1.5 2.0 2.0

DN 80 Open Termination With Mesh 4.0 5.5 8.0

DN 100 Open Termination with Mesh 2.0 3.0 4.0

80/125 Concentric Wall Terminal With Vertical Discharge 7.5 11.0 16.0

80/125 To 100/150 Concentric Increaser 2.0 3.0 5.0

100/150 Concentric Wall Terminal 3.0 4.0 7.0

100/150 Concentric Roof Terminal 3.0 4.0 7.0

1m length 100/150 Concentric Tube 2.0 3.0 5.0

93° 100/150 Concentric Bend 2.0 3.0 5.0

45° 100/150 Concentric Bend 2.0 2.0 3.0

Boiler Model

15.0 flue

terminal positions

Flue Terminal Positions

Fig. 19

H,I

F D

A G

B,C

STRATA1

Minimum dimensions of flue terminal positions see fig 19

Dimension Terminal Position Balanced flue Non room

room sealed sealed

A Directly below an opening, air

brick, windows etc. Not Recommended. 300 mm 300 mm

B Below gutters, soil pipes or

drain pipes 75 mm 75 mm

C Below eaves 200 mm 200 mm

D Below balconies or car port

roof. Not Recommended. 200 mm 200 mm

E From a vertical drain pipe or

soil pipe 150 mm 150 mm

F From an internal or external

corner 300 mm 200 mm

G Above ground, intersecting

roof or balcony level 300 mm 300 mm

H From a surface facing the

terminal 2000 mm 2000 mm

I From a terminal facing the

terminal 2000 mm 2000 mm

J From an opening in the car port

(e.g. door, window) into dwelling 1200 mm 1200 mm

K Vertically from a terminal on the

same wall 1500 mm 1500 mm

L Horizontally from a terminal on

the same wall. 300 mm 300 mm

M From a vertical structure on the

roof 500 mm N/A

N Above intersection with roof 500 mm 150 mm

P Directly above an opening, 300 mm 300 mm

air brick, window etc

Q Horizontally to an opening, 500 mm 500 mm

air brick, window etc

15.0 flue terminal positions (contd)

but installation not recommended.

STRATA1

16.0 ventilation requirements

single appliances

Table 1 Room Installation - Non

Room Sealed Flue.

Natural Ventilation Direct to Outside Air

Boiler Model Ventilation Openings Free Area cm

Strata 1/45 180 For position see BS 5440: Part 2: 2000 Strata 1/60 250 For position see BS 5440: Part 2: 2000 Strata 1/75 319 High Level 637 Low Level

Table 2 Room Installation - Non Room Sealed Flue

Natural Ventilation From Adjacent Room

Boiler Model Ventilation Openings Free Area cm

Strata 1/45 180cm2with adjacent room equally

ventilated direct to outside air.

Strata 1/60 250cm

with adjacent room equally

ventilated direct to outside air.

Strata 1/75 Ventilation from adjacent room not permitted - See Table 1 above.

Table 3 Room Installation - Room Sealed Flue.

There are no specific requirements for a room to be ventilated where the appliance is room sealed. However, consideration should be given to providing ventilation for general cooling, (BS6644 specifies room temperature limits).

Table 4 Compartment Installation - Non room sealed flue

Natural Ventilation Direct to outside air

Boiler Model Ventilation Openings Free Area cm

High Level Low Level

Strata 1/45 215 430 Strata 1/60 285 570 Strata 1/75 319 637

Table 5 Compartment Installation - Non room sealed flue

Natural Ventilation from Adjacent room

Boiler Model Ventilation Openings Free Area cm

High Level Low Level

Strata 1/45 430 860

with adjacent room ventilated at 180cm

direct to outside air.

Strata 1/60 570 1140

With adjacent room ventilated at 250cm

direct to outside air.

Strata 1/75 Ventilation from adjacent room not permitted - See Table 1 above.

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. The guidance given in this publication is based on information in the above mentioned BS publications.

The following tables must be read to ascertain the amount of ventilation required.

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 1/45 215 215 Strata 1/60 285 285 Strata 1/75 360 360

Table 7 Compartment Installation - Room Sealed Flue

Natural Ventilation from Adjacent Room

Boiler Model Ventilation Openings Free Area cm

High Level Low Level

Strata 1/45 430 430 Strata 1/60 570 570 Strata 1/75 Ventilation from adjacent room not permitted - See Table 1 above.

Multiple Appliances Installed in the Same Room or Space

Where multiple Strata 1 boilers are installed in the same room or space then the aggregate of the appliance inputs must be taken to determine (from the following data) the amount of ventilation required.

Appliance gross heat inputs should be taken as:-

Strata 1/45 = 50.34 kW Strata 1/60 = 60.20 kW Strata 1/75 = 81.41 kW

Table 8 Non Room Sealed Flue Installations

Natural Ventilation Direct to Outside Air.

Low Level (Inlet): 540cm

plus 4.5cm2per kW in excess of 60kW total rated input.

High Level (Outlet): 270cm

plus 2.25cm2per kW in excess of 60kW total rated input.

Ta b l e . 9 Room Sealed Flue Installations

Natural Ventilation Direct to Outside Air (Ventilation recommended for cooling purposes)

Low Level (Inlet): 4.5cm

per kW of total rated input.

High Level (Outlet): 4.5cm

per kW of total rated input.

STRATA1

17.0 hydraulic system

design

● The Strata 1 boiler can be operated to serve a heating load in a number of ways:

1. Constant flow temperature, with the option to set either high temperature (85°C), medium temperature (70°C) or low temperature (55°C).

2. Direct-on-boiler weather compensated flow temperatures, with adjustable maximum flow temperature.

3. Underfloor heating coils via a VT mixing valve with a maximum flow temperature of 55°C plus a second circuit (eg. radiators) operating with direct-on-boiler weather compensated temperatures.

● Flow to return drop (∆t). The microprocessor controls monitor return temperature and the facility to dictate a set ∆t (by pump speed modulation) is a standard and most important feature and will where possible maintain the ∆t across the boiler at 20°C, as the lower the return temperature, the higher the operating efficiency. Designing for a ∆t 20°C gives the added cost saving advantage of smaller pipe sizes and pumps.

● The Strata 1 includes ‘in built’ primary pumps with a residual head pressure as listed below.

● Appliances may be installed as single units or in multiples.

● Single units may or may not require additional system pumps which will be dictated by the system

configuration and by the index resistance.

● Multiple units (and single units which require additional pumps), must always be installed with a low loss mixing header or similar arrangement. - see table below.

● The Strata 1 boiler has in built domestic hot water (remote stored) temperature control ability, and if required, the in built pumps may be used to provide the primary flow to a nearby indirect cylinder or calorifier with the boiler controlling a diverter valve in the main flow or return pipework.

● BS 6644 Requires that the following devices shall be installed, and provision within the system design must allow for: Low water pressure cut off device, water pressure gauge and a temperature gauge.

Boiler Power kW

Up to 45

75 100 120 150 200 250 270 300 340

Design ∆t 20°C

40mm 50mm 65mm 65mm 80mm

80mm 100mm 100mm 100mm 100mm

low velocity

mixing header

diameter

sizing guide

Tube diameters refer to steel pipe and calculated using data from

CIBSE Guide C4

The following system schematics show a number of typical installation types to which the Strata 1 boiler

may be connected.

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.

Boiler Model

45 60 75

Pressure Metres wc

3.1

3.0

2.6

in-built boiler pumps

approx residual

head pressure at

max speed

Residual head pressure, at minimum speed all models 1.0 metres W.C.

STRATA1

17.0 hydraulic system

design

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

OS= Outside air temperature sensor, used where

direct-on-boiler weather compensated flow temperatures are required

C= Room temperature & time controls e.g.

RE2132 modulating room unit from MHS Boilers, or, separate time clock & room thermostat

PS= Low water pressure cut off switch.

*1= Filling Point. In accordance with BS 6644,

automatic pressurisation unit must be installed when the boiler input is greater than 60kW. See item 17.1

System Type 1

DOC

AAV

Boiler

Strata 1

Heating Load

LSV

DOC

Condense

Strainer

Waste

DOC

Vessel

Expansion

Filling Point

CWM

STRATA1

17.0 hydraulic system

design

OS= Outside air temperature sensor, used where

direct-on-boiler weather compensated flow temperatures are required

C= Room temperature controls

e.g. RE2132 modulating room unit from MHS Boilers, or, separate time clock & room thermostat

S= 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". Allows for timed HWS.

Divertor valve will require SPDT relay if not spring return.

Divertor valve must be so installed as to spring return to heating.

PS= Low water pressure cut off switch.

*1= Filling Point. In accordance with BS 6644,

automatic pressurisation unit must be installed when the boiler input is greater than 60kW. See item 17.1

Typical single Strata 1 boiler installation serving domestic hot water and heating where hotwater has priority via a divertor valve. The in-built circulating pumps within the boiler are used to circulate the system (used only where system index resistance < pump residual head - see page 24). Flow temperature to hotwater is constant and flow temperature to heating may be constant or weather variable.

System Type 2

DOC

AAV

Strata 1

Boiler

Heating Load

Divertor

Valve

Strainer

Waste

Condense

DOC

LSVDOC

Vessel

Expansion

Filling

Point

DOC

Calorifier/Indirect

Hot Water Cylinder

CWM

STRATA1

17.0 hydraulic system

design

OS= Outside air temperature sensor, used where

direct-on-boiler weather compensated flow temperatures are required.

C= 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 & summer standstill exercising. Must be used

where RE2132 modulating room unit is installed. Max pump motor load 2A

PS= Low water pressure cut off switch

*1= Filling Point. In accordance with BS 6644,

automatic pressurisation unit must be installed when the boiler input is greater than 60kW. See item 17.1

Typical Single Strata 1 boiler installation serving heating only and using a low velocity mixing header where system index resistance exceeds in-built boiler pump residual head - see page 24. Flow temperature may be fixed/constant or weather variable.

System Type 3

DOC

AAV

Strata 1

Boiler

Heating Load

PRO 1

LSV

DOC

Waste

Condense

AAV

Strainer

Heating Pump

DOC

Vessel

Expansion

Low Velocity

Mixing Header

Max Velocity 0.5m/s

Point

Filling

IV IV

CWM

Strainer

DOC

STRATA1

17.0 hydraulic system

design

OS= Outside air temperature sensor, used where

direct-on-boiler weather compensated flow temperatures are required.

C= Room temperature controls e.g. RE2132

modulating room unit from MHS Boilers, or, separate time clock & room thermostat.

S= 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". Allows for timed HWS.

PRO1=Pump regulation module from MHS Boilers.

Allows heating pump to be driven from boiler, providing for auto operation, frost protection running & summer standstill exercising. Must be used

where RE2132 modulating room unit is installed. Max pump motor load 2A

Divertor valve wil require SPDT relay if not spring return.

Divertor valve must be so installed as to spring return to heating.

PS= Low water pressure cut off switch

*1= Filling Point. In accordance with BS 6644,

automatic pressurisation unit must be installed when the boiler input is greater than 60kW. See item 17.1

Typical Single Strata 1 boiler installation serving heating & domestic hot water. Hot water is priority and is served via a divertor valve and the boiler's in built circulating pump where index loss through HWS primaries is less than boiler pump residual head*. Heating circuit index loss exceeds boiler pump residual head* and is served via a low velocity mixing header and a separate pump. Heating flow temperature may be fixed/constant or weather variable.

* See page 24

System Type 4

Heating Load

AAV

Boiler

Strata 1

PRO 1

AAV

Waste

Condense

Heating Pump

Valve

Divertor

Strainer

Low Velocity

LSV

DOC

Mixing Header

Max Velocity 0.5m/s

Vessel

Expansion

Strainer

IV IV

DOC DOC

Point

Filling

CWM

DOC

Calorifier/Indirect

Hot Water Cylinder

STRATA1

17.0 hydraulic system

design

OS= Outside air temperature sensor, used where

direct-on-boiler weather compensated flow temperatures are required.

C= Room temperature controls e.g. RE2132

modulating room unit from MHS Boilers, or, separate time clock & room thermostat.

S= 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". Allows for timed HWS.

PRO1=Pump regulation module from MHS Boilers.

Allows heating pump to be driven from boiler, providing for auto operation, frost protection running & summer standstill exercising. Must be used where RE2132 modulating room unit is installed. Max pump motor load 2A

PS= Low water pressure cut off switch

*1= Filling Point. In accordance with BS 6644,

automatic pressurisation unit must be installed when the boiler input is greater than 60kW. See item 17.1

Typical Single Strata 1 boiler installation serving heating & domestic hot water with hot water priority. Hotwater & heating circuits both have index resistance exceeding boiler pump residual head* & are served by independent pumps from a low velocity mixing header. Heating flow temperature may be fixed/constant or weather variable.

* See page 24

System Type 5

DOC

Heating Load

Calorifier/Indirect

Cylinder

AAV

Boiler

Strata 1

PRO 1

AAV

LSV

DOC

Condense Waste

DOC

Vessel

Expansion

HWS Primary

Pump Max 1A.

Heating Pump

Low Velocity

Mixing Header

IV DOC

0.5m/s

Max Velocity

Strainer

Point

Filling

CWM

Strainer

DOC IV

STRATA1

17.0 hydraulic system

design

OS= Outside air temperature sensor, used where

direct-on-boiler weather compensated flow temperatures are required.

C= Room temperature controls e.g. RE2132

modulating room unit from MHS Boilers, or, separate time clock & room thermostat.

FS= Flow temperature sensor

RS= Return temperature sensor

S= Hot water temperature sensor or thermostat

KKM2=Modulating Kaskade Manager. Up to 9Nr

boilers may be controlled using 2Nr linked KKm2's.

PS= Low water pressure cut off switch

*1= Filling Point. In accordance with BS 6644,

automatic pressurisation unit must be installed when the boilers input is greater than 60kW. See item 17.1

Typical Multiple Strata 1 installation. Boilers controlled by modulating Kaskade manager which also has the facility to control heating & domestic hot water production. Heating flow temperature may be fixed/constant or weather variable. Hot water has priority.

System Type 6

DOC

KKM 2

Heating Load

AAV

AAV's AAV's AAV's

Heating Pump

2A. Max

Strata 1

HWS Primary

Pump

Boiler

2A. Max

SVSVSV

DOCDOCDOC

Hot Water

Calorifier or

Indirect Cylinder

Low Velocity

Mixing Header

Max Velocity 0.5m/s

NRVNRVNRV

Waste

Condense

DOC

Strainer

Expansion

Vessel

LSV DOC

Filling

Point

CWM

IV IV

IVIVIVIVIVIV

STRATA1

17.0 hydraulic system

design

OS= Outside air temperature sensor. Provides outside

air temperature reference for both heating zones

MRO3=Pumps and mixer regulation control box from

MHS Boilers provides pump control for both heating zones i.e. auto operation, frost protection and summer stand still protection running. Provides drive for underfloor coil zone VT mixing valve with max flow temperature limitation set at 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. RC2= As RC1 but for underfloor coil zone. VS= Underfloor zone VT flow sensor (supplied with MR03) S= HWS sensor from MHS Boilers. Gives 24hr operation. W/T= Alternative to "S" where "W" is a time switch in series

with a cylinder thermostat "T". Allows for timed HWS.

PS= Low water pressure cut off switch

*1= Filling Point. In accordance with BS 6644,

automatic pressurisation unit must be

installed when the boiler input is greater

than 60kW.

See item 17.1

Typical Single Strata 1 boiler installation serving domestic hotwater and radiator heating zone and an underfloor coil zone all via a low velocity mixing header. The HWS will always have priority. the 2Nr heating zones may operate independently via 2 Nr separate room units. The 2 Nr heating zones will always be weather compensated but may have differing compensation slopes

System Type 7

Calorifier or

Radiator Zone

Indirect Cylinder

DOC

AAV's

Under Floor Zone

VT Pump

U/Floor VT

HWS Primary

Pump

DOC

MRO3

Waste

Condense

Low Velocity

Boiler

Strata 1

Radiator

AAV

Pump

Zone

Mixing Valve

Mixing Header

V Max 0.5m/s

Strainer

IV IV

Under Floor

Coils Zone ∆t 10ºc

DOC

LSV

Expansion

DOC

Vessel

Strainer

DOC

Point

Filling

CWM

STRATA1

17.0 hydraulic system

design

P= Programmer

WC= Wiring Centre/Junction Box

RS= Room Thermostat

CS= Cylinder Thermostat

PS= Low water pressure cut off switch

*1= Filling Point. In accordance with BS 6644,

automatic pressurisation unit must be installed when the boiler input is greater than 60kW. See item 17.1

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-onboiler weather compensation is not possible.

System Type 8

Typical Schematic Arrangement Where System Has Multiple Pumps That Will Operate At The Same Time.

Heating Load

AAV

M/Valve

LSV

DOC

AAV

Condense

Waste

M/Valve

DOC

Expansion

Vessel

System Pump

Reg Valve

Indirect Cylinder/Calorifier

IVIV

Strainer

Low Velocity

Mixing Header

Max Velocity

0.5 m/s

DOC

Strainer

Filling Point

CWM

Boiler/s

Flow Header

Low Velocity Mixing Header

Max Velocity 0.5m/s

Circuit Pumps That Can/Will Run At The Same Time

STRATA1

17.2 water treatment system cleaning

The entire system must be thoroughly cleansed and flushed to remove debris, flux residues etc before opening the boiler isolation valves & flooding the boiler. Particular care must be taken where the Strata boiler is being retro-fitted into an old/existing system, as system silt or magenite can be very damaging to the new boiler.

Following cleansing and flushing the system must be dosed with a good quality water treatment to prevent corrosion and the formation of scale.

For specific guidance on water treatment, direct contact is advisable with:-

Betz Dearborn Limited Fernox Widnes Tandem House Cheshire Marlowe Way WA8 8UD Croydon

Surrey CR0 4XS

Telephone: 0151 495 1861 Telephone: 0208 665 6666

Failure to observe these requirements will render the guarantee on the product void. Cleansing, flushing and water treatment must be carried out in accordance with the requirements of BS 7593:1992.

For Category 4 systems, the approved method of filling must comprise of the following components in the arrangement shown;

● Control Valve

● Strainer

● Verifiable Backflow Device with

Reduced Pressure Zone (RPZ Valve).

Incorporating a 'Type BA' air gap.

● Tundish

● Control Valve

Further more, in accordance with BS6644, for boiler/s with an input greater than 60kW, an automatic pressurisation unit must be installed to automatically replenish any lost or evpourated water.

The pressurisation unit must comprise of the following components;

● A Cistern fitted with a Float Operated Valve incorporating either a 'Type AG' (C-3), or 'Type AF' (C-4)

air gap.

● A Presssure Booster Pump fitted with a Single Check Valve

● A Pressure Reducing Valve

● A Pressure Switch

For information on a comprehensive range of pressurisation units please contact MHS Sales.

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). Non Domestic (Other than In-House) Fluid Category 4 (C-4).

For Category 3 systems, the approved method of filling must comprise of the following components in the arrangement shown;

● Control Valve incorporating a Double Check

Valve on the mains cold water pipework.

● Temporary Connecting hose, which must

be disconnected after use.

● Control Valve, on the heating system.

MCWS

DCV HOSE

Heating System

MCWS

CV CV

Strainer

Heating System

Tundish

RPZ

STRATA1

17.5 care with the use of soldering flux

18.0 electrical

connection

The electrical connections to the Strata 1 boiler are made via discreet plugs and sockets (Weiland Type)

which are located within the boiler case and below the control panel.

Connections must only be made using appropriate diameter multi strand flex cables and cable entry must only be via the rubber glanded cable entry points located at the bottom rear r/h side of the appliance. If the boiler is to be room sealed flued then care must be taken to ensure the cable entries are reasonably air tight.

For electrical connection plug/socket function and location see fig 20.

The Strata 1 boiler has heat exchangers fabricated from 316L stainless steel. It is most important that the compatibility of any flux is checked with the flux supplier before use, and that any flux manufacturers recommendations are strictly followed with regards to use in conjunction with stainless steel.

Cable entry glands

3265

Position of Weiland Plugs

Weiland Plug

Nr.: 1

Weiland Plug

Nr.: 4

Permanent Supply (L1+PE+N)

Outside Air Sensor (A1+A2) RE2132 Room Unit (R1+R2+R3) KKM2 Kaskade Manager (R2+R3) 0-10v via an adapter ‘+’ R2 ‘-’ R1 0-3v ‘+’ R2, ‘-’ R1

Weiland Plug

Nr.: 3

Weiland Plug

Nr.: 2

Weiland Plug

Nr.: 6

Weiland Plug

Nr.: 5

Fig. 20

Room Thermostat Volt free enable (L2+L1) PRO1/MRO3 (N+PE+L1)

External Gas Safety Shut off Valve-LPG only (if req'd) (N+PE+L1)

HWS Divertor Valve or HWS Primary Pump (N+PE+L1)

HWS Sensor or Volt free Thermostat

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.

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.

L1 N

A1 A2 R2

NPE

L2 L1

L1N

STRATA1

plan of internal electrical connections

2 (X)

FUSE

230 VAC

HSP TOP

FUSE 24V

FURIMAT 762

X4 X5

413

LNPE

ALARM CONTACT

K13

PRO1/MRO3

X62 X32

X61

X31

LNPE

X29

X28

X57

X56

LNPE

X27

X26

K20 K20 K17

K19

K13

K18

R17 K19

K12 K18

X16

K3 K14

K7 K0 K6 K8 K4

K0 K0

X51

Fan

X21

5511

Fan

X20 X48

STBA

X47

X19

STBW

X18 X17

STBW

Ionisation 1 Ignition/

Ionisation 2 Ignition/

X65

Pump 1-2

X25

Pump 1-1

Transformer

X23

X22

Gas Valves 2

(right)

Gas Valves 1

(left)

24 VDC

Burner Fan 2

24 VDC

Burner Fan 1

Fluegas

Limit Thermostat

Water

Limit Thermostat 2

Water

Limit Thermostat 1

X42

X43 X41

K9 = Violet

K12 = Yellow/White

K13 = Braun/White

K14 = Green/White

K17 = Blue/White

KO = White

K2 = Brown

K3 = Green

K4 = Gray

K5 = Orange

R3 R2

R1 A2 A!

SUPPLY

230 VAC

PE N

LPG

Solenoid

N L2

R/Stat

PRO 1

MRO3

HWS D/Valve

HWS Pump

6 3 2 1

K18 = Red/White

K19 = Black/White

K20 = Violet/White

K6 = Blue

K7 = Red

K8 = Black

1 = Lower Burner/Heat Exchanger. 2 = Upper Burner/Heat Exchanger

Outside temperature

room unit

Kaskade Manager

X2 X3

K8 K3 K2

K7 K7

RS232

K6 K6

X15

Flow 2

X14

X12

212 1 2

X10

VIE

S4 S1

RIE

VIE

Return

Sensors

Flow 1

HWS

X45 X44

= Weiland Plugs

STRATA1

typical electrical connection schematic to suit system type 1

Outside sensor

installed. Room

stat & time

switch installed.

No outside

sensor. Room

stat & time

Outside sensor

installed. RE2132

switch installed.

modulating room

unit installed.

No outside

sensor. RE2132

modulating room

unit installed.

10 6

Not Used

PE L1

2 1

R3 R2 R1 A2 A1

3 4 5 6X3X16

= Controls Sockets on Control panel

= Weiland Plugs/Sockets

PE L1

2 1

Boiler Dip Switch Settings

Sensor

Outside Air

* *

+24V

PMW

GND

3251 4

Room Unit Modulating RE2132

or Volt free Switch And Time switch Room Thermostat

* *

Remote Sensor Optional QAW44

3 4 5 6 1

X3,X16

PE L1

Low Pressure

Switch break

on Pressure Fall

230 V

Supply

Install only if direct-on-boiler weather

compensated flow temperature are

required.

Install only one method of external time

and room temperature control. If room

stat and time switch are required, then

* *

Weiland plug Nr2-not shown. Used only

on LPG installations where an additional

do not install RE2132 room unit and

vice versa.

remote gas safety shut off valve is req'd.

STRATA1

typical electrical connection schematic to suit system type 2

Outside sensor

installed. Room

stat & time

switch installed.

No outside

sensor. Room

stat & time

switch installed.

Outside sensor

installed. RE2132

modulating room

unit installed.

No outside

sensor. RE2132

modulating room

unit installed.

X16

Boiler Dip Switch Settings

Not Used

10 6

PE L1

2 1

R3 R2 R1 A2 A1

2 1

HWS Sensor

+24V

PMW

GND

Sensor Outside Air

PE L1

3251 4

SPDT Relay

Valve - Spring Return Type. HWS Primary Divertor

And Time switch Cylinder Thermostat

Room Unit

Modulating RE2132

Open

open, motor shut type valve. Divertor Valve using motor to Spring Return HWS Primary Alternative arrangement

Sensor

Remote

Optional QAW44

Weiland plug Nr2-notshown. Used only

on LPG installations where an additional

remote gas safety shut off valve is req'd.

= Controls Sockets on Control panel

= Weiland Plugs/Sockets

X3,X16

1 3 4 5 6

1 3 4 5 6X3

Low Pressure

Switch break

on Pressure Fall

230 V

Supply

Or Volt Free Switch And Time switch Room Thermostat

Install only if direct-on-boiler weather

compensated flow temperature is

required.

Install only one method of external time

and room temperature control. If room

stat and time switch are required, then

do not install RE2132 room unit and

vice versa.

Install only one method of HWS

temperature control. The use of an HWS

Sensor will allow no time control over

hotwater production. If timed hotwater

* *

control is req'd then do not install an HWS

sensor, but install only a timeswitch & cylinder

T/stat.

STRATA1

typical electrical connection schematic to suit system type 3

into PRO1 are made

via labelled factory

fitted cables.

NOTE: All connections

X16

Heating

Pump

2A Max

PEPRO1

Outside sensor

installed. Room

stat & time

switch installed.

No outside

sensor. Room

Outside sensor

stat & time

switch installed.

installed. RE2132

modulating room

unit installed.

No outside

sensor. RE2132

modulating room

unit installed.

Moulded Plug Assembly

10 6

PE L1

Not Used

2 1

R3 R2 R1 A2 A1

= Controls Sockets on Control panel

= Weiland Plugs/Sockets

Boiler Dip Switch Settings

+24V PWM

GND

2 1

Sensor Outside Air

3251 4

Room Unit Modulating RE2132

Or Volt Free Switch And Time Switch Room Thermostat

Sensor Remote Optional QAW 44

Weiland plug Nr2-notshown. Used only

on LPG installations where an additional

remote gas safety shut off valve is req'd.

1 3 4 5 6

X3,X16

1 3 4 5 6X3

Low Pressure

Switch break

on Pressure Fall

230 V

Supply

Install only if direct-on-boiler weather

compensated flow temperature is

required.

Install only one method of external time

and room temperature control. If room

stat and time switch are required, then

do not install RE2132 room unit and

vice versa.

* *

STRATA1

typical electrical connection schematic to suit system type 4

Outside sensor

installed. Room

stat & time

switch installed.

No outside

sensor. Room

NOTE: All connections

into PRO1 are made Via

labelled factory fitted cables.

stat & time

switch installed.

Outside sensor

installed. RE2132

modulating room

unit installed.

No outside

sensor. RE2132

modulating room

unit installed.

Moulded Plug Assembly

10 6

6 X3 X16

2 1

R3 R2 R1 A2 A1

Heating

Boiler Dip Switch Settings

Pump

2A Max

PEPRO1

3 6

HWS sensor

2 1

PE L1

+24V PWM

GND

3251

Sensor

Outside Air

Open

SPDT Relay

Return Type Valve - Spring HWS primary Divertor

And Time switch Cylinder Stat

Room Unit

Modulating RE2132

open, Shut type valve. Divertor Valve Using Motor spring Return HWS Primary Alternative arrangement to

Weiland plug Nr2-notshown. Used only

on LPG installations where an additional

remote gas safety shut off valve is req'd.

Sensor Remote Optional QAW44

Install only one method of HWS

temperature control. The use of an HWS

Sensor will allow no time control over

hotwater production. If timed hotwater

control is req'd then do not install an HWS

sensor, but install only a timeswitch & cylinder

T/stat.

= Weiland Plugs/Sockets

= Controls Sockets on Control panel. PRO1 has factory made on plugs and leads for these connections

X3,X16

1 3 4 5 6

1 3 4 5

Low Pressure

Switch break

on Pressure Fall

230 V

Supply

Or Volt Free Switch And Time switch Room Thermostat

Install only if direct-on-boiler weather

compensated flow temperature are

required.

Install only one method of external time

and room temperature control. If room

stat and time switch are required, then

do not install RE2132 room unit and

vice versa.

* *

STRATA1

typical electrical connection schematic to suit system type 5

Outside sensor

installed. Room

stat & time

switch installed.

No outside

sensor. Room

Heating

Pump

2A Max

stat & time

switch installed.

Outside sensor

installed. RE2132

modulating room

unit installed.

No outside

sensor. RE2132

modulating room

unit installed.

Moulded Plug Assembly

10 6

N PE L1

2 1

R3 R2 R1 A2 A1

PEPRO1

NOTE: All connections

into PRO1 are made Via

labelled factory fitted cables.

LPEN

HWS sensor

2 1

Boiler Dip Switch Settings

Pump 2A Max HWS Primary

+24V PWM

GND

Sensor

3251

Outside Air

And Time switch Cylinder Stat

Room Unit

Modulating RE2132

Weiland plug Nr2-notshown. Used only

on LPG installations where an additional

remote gas safety shut off valve is req'd.

Sensor Remote Optional QAW44

Install only one method of HWS

temperature control. The use of an HWS

Sensor will allow no time control over

hotwater production. If timed hotwater

L2 N PE

1 3 4 5 6 X3 X16

N PE L1

Low Pressure

Switch break

on Pressure Fall

= Weiland Plugs/Sockets

= Controls Sockets on Control panel. PRO1 has factory made on plugs and leads for these connections

X3,X16

1 3 4 5 6

230 V

Supply

Or Volt Free Switch And Time switch Room Thermostat

Install only if direct-on-boiler weather

compensated flow temperature are

required.

Install only one method of external time

control is req'd then do not install an HWS

sensor, but install only a timeswitch & cylinder

T/stat.

and room temperature control. If room

stat and time switch are required, then

do not install RE2132 room unit and

vice versa.

* *

STRATA1

typical electrical connection schematic to suit system type 6

NOTE:

No connections,

other than those

shown are to be

26 28 30 32 34

23 25 27 29 31 33

X2 X4

made to the boilers.

Boiler Dip Switch Settings -

repeat on each boiler

Boilers

Not Used Additional

+24V

GND

PMW

43521

R3 R2

4 4

No3

No2

No1

Room Unit

Modulating RE2132

Boiler

PE L1

1 1 1

R 1/1 R 1/2 R 1/3

Remote Sensor Optional QAW44

230 V

Supply

230 V

Supply

230 V

Supply

Relay R1

Low Pressure Switch

break on Pressure Fall

14 16 18 20 22 24

11 13 15 17 19 21

4 6 10 12

= Weiland Plugs/Sockets on boilers

= Terminal Rails on KKM2 Kaskade Manager

1 4

X1,X2,X4

13579

* Outside Air Sensor

* HWS Sensor

Return sensor

Flow Sensor

16 18 20 22

13 15 17 19 21

230V

Supply

2A Max Pump 230V

Heating Circuit

2A max Pump 230V

HWS Primary

- If Required

For Heating Circuit * External Controls

Time Switch

* Cylinder Stat/HWS

Control Options

Alternative External

STRATA1

typical electrical connection schematic to suit system type 7

Pump #2

Radiator

Zone Pump

2A Max

Moulded Plug Assembly

10 6

N PE L1

Pump #1

Underfloor

Zone VT

Pump 2 A Max

MRO3

LPEN

Underfloor

L1NPE

R6 R5 R4

Zone VT

Mixing Valve

NOTE: All connections

into MRO3 are made Via

labelled factory fitted cables with

the exception of the underfloor

Zone RE2132 which is cabled by

the installer

VT Flow sensor Underfloor Zone

+24V PWM

GND

43251

Pump 2A Max HWS Primary

Boiler Dip Switch Settings

being controlled via RE2132 Only possible if the boiler is Unit For Underfloor Zone RE2132 Modulating Room

2 1

HWS sensor

Low Pressure

Switch break

on Pressure Fall

Time Switch

Sensor Outside Air

230 V

Supply

+24V PWM

GND

43251

Stat Cylinder

Radiator Zone Room Unit For RE2132 Modulating

Sensor Remote Optional QAW 44

Weiland plug Nr2-notshown. Used only

on LPG installations where an additional

remote gas safety shut off valve is req'd.

Install only one method of HWS

temperature control. The use of an HWS

Sensor will allow no time control over

2 1

R3 R2 R1 A2 A1

L2 N PE

1 3 4 5 6 X3 X16

N PE L1

= Weiland Plugs/Sockets

= Controls Sockets on Control panel. MRO3 has factory made on plugs and leads for these connections

X3,X16

1 3 4 5 6

hotwater production. If timed hotwater

control is req'd then do not install an HWS

sensor, but install only a timeswitch & cylinder

T/stat.

STRATA1

typical electrical connection schematic to suit system type 8

X16

10 6

N PE L1

NOT USED

2 1

R3 R2 R1 A2 A1

L2 N PE

= Controls Sockets on Control panel

= Weiland Plugs/Sockets

Boiler Dip Switch Settings

HW M\V

CH M\V

HW M/V & CH M/V

Junction

Box

NE E

LL34567N

= typical spring return

type motorised valves

with end switches

System Pump

Max 2A

LPEN

R/Stat

Cyl Stat

Weiland plug Nr2-notshown. Used only

on LPG installations where an additional

remote gas safety shut off valve is req'd.

OFF

Typical Programmer

LN E

1 3 4 5 6

X3,X16

N PE

1 3 4 5 6X3

Low Pressure

Switch break

on Pressure Fall

230 V

Supply

STRATA1

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.

system pump control

PRO1 module: for single boiler applications. A small and neat wall mounted control box which allows the boiler to control a system heating pump. The use of this device allows the boiler to start/stop the system pump according to the dictates of any external controls that may be connected to the boiler with the additional features of pump overrun, daily pump exercising and frost protection running. Maximum load 2A 230 Vac.

combination pump and underfloor system mixing valve control

MRO3 module: For single boiler applications. A small and neat wall mounted control box which allows the boiler to control two different heating circuits.

Circuit 1 - A variable temperature circuit with pump and mixing valve (240v) for use with underfloor

coils where the maximum flow temperature = 55°C.

Circuit 2 - A pumped heating circuit (eg radiators) where the flow temperature is direct-on-boiler

weather compensated variable. The control of the pumps has the same features as the PRO1 module described above. The MRO3 has the facility to connect an RE2132 modulating room unit to provide modulating room temperature and time control over the underfloor circuit. A second RE2132 unit may be connected directly to the boiler to control Circuit No.2.

modulating room temperature control

RE2132 room unit: A compact digital room temperature control that will modulate boiler power according to room temperature requirements.

key features

● In-built optimising time control and temperature sensor.

● Three temperature levels including frost protection.

● Holiday programmable.

● Can be used as a remote control for parallel shift of compensation slope.

● Possibility to connect a remote sensor to give temperature averaging.

● Self learning.

● Can be connected to an individual boiler, on MR03 (underfloor) control or a KKM2

sequence controller.

● QAW44 an addition tamper proof sensor can be wired to the RE2132 to allow sensing of remote

areas away from RE2132.

18.1 optional matched

controls

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.

In addition to boiler control, the KKM2 can provide the drive signal for a heating circuit pump and can provide control for stored domestic hot water (with priority over heating). Domestic hot water may be charged using either a diverter valve or primary pump, either of which are driven from the sequencer.

External control input is via either a volt free contact (eg time switch) 0-3 or 0-10 Volt input or an RE2132 modulating room unit plus necessary temperature sensors. Heating flow temperatures may be either constant temperature or direct-on-boiler weather compensated variable (by means of the in-built compensator). If more than five boilers are required to be controlled, then additional KKM2’s may be slaved to the first control with slave capacity of four boilers per each additional sequencer. Standard features include pump overrun and boiler load rotation.

18.1 optional matched controls (contd)

outside air temperature sensor

If weather compensated flow temperature (recommended for best seasonal efficiency and comfort) is required, then the supplied air sensor must be installed and electrically connected to the boiler. The outside air sensor should be installed on the exterior face of a north facing wall, away from any artificial influences such as ventilation discharge grilles or in direct sunlight. Ø 5mm wall fixings and screws are provided.

domestic hot water temperature sensor

If a hot water temperature sensor (from MHS Boilers) is used to sense the temperature of stored hot water, then this should be inserted into a pocket or surface mounted to measure the water temperature at approximately 1/3 of the height of the hot water vessel up from the base of the vessel.

TOP

Outside Air Temperature Sensor

Length m

Up to 35

35 to 70

70 to 140

Cable Diameter mm

0.25

0.5

1.0

Cable Detail

Length m

Up to 35

35 to 70

70 to 140

Cable Diameter mm

0.25

0.5

1.0

Cable Detail

STRATA1

Remote Fault

Indication

The Strata 1 boiler includes a built in fault alarm relay with volt free contacts for interface with, if required a remote alarm indicator.

The volt free contacts within the boiler control panel will close in the event that the boiler goes to a fault resulting in boiler lockout. The volt free contacts indicate “common alarm” upon closing. 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 x9 located in the lower area of the boiler control panel.

19.0 commissioning

the strata 1 boiler

The Strata 1 boiler should be expertly commissioned by a competent engineer who will need, in addition to standard hand tools, a U tube manometer and a combustion analyser.

Before attempting to set the Strata 1 boiler to work, the following check list must be worked through. See 19.1.

18.2

0-3/0-10 volt control

The Strata 1 can be operated via 0-3 volt or 0-10 volt control. The connection details are shown in fig 22. For further details on 0-3 or 0-10 volt control please contact the Technical Department.

0-3 volt control direct to boiler plug Nr: 4 without adaptor.

0-10 volt control via 0-10 volt adapter (optional extra).

Fig. 22

STRATA1

To Boiler Socket Nr: 4

Weiland Plug

Nr: 4

0-10 volt Adapter

A1 A2

0v V+

Weiland Connection Plug

Nr: 4

X9 Socket

X9 Alarm Plug & Lead Assembly

Remote Alarm Circuit

STRATA1

19.1 pre-commissioning

checks

a) 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.

b) 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.

c) Check that the pumps within the boiler are free to rotate by removing the vent screw in the end

of both pump motors and checking that the impeller shafts rotate freely when turned

with an appropriate sized screwdriver. Replace vent screws. d) Ensure the appliance has been converted to burn the type of gas available on site. e) Ensure Gas supply has been purged and there is the availability of working inlet pressure of

nominal 20 mbar (Nat gas) or 37 mbar (LPG). f) Check that the flue installation has been properly made. g) Check that a condense waste pipe

(in plastic - copper tube is not

acceptable) has been connected to

the boiler and that the syphon

cleaning point cap is in place. h) Where the appliance is taking air

for combustion from the room in

which it is installed - ensure an

adequate provision for ventilation has

been made in accordance within British Standards BS6644 (1991) and 5440-2 (2000). i) Ensure that there is an adequate heat load available. j) Ensure that the electrical connections have been made correctly. k) Ensure that the appliance has been correctly configured via the Dip switches located on the

bottom right hand side of the control panel. See Dip switch setting table in 19.1.1.

19.3 first

firing

Notes The Strata 1 boiler has 2Nr Heat Exchange and Burner Assemblies. The Lower Assembly is referred to as No1 and the upper as No2. There are two gas valves - one for each burner; the left hand gas valve serves the lower assembly (No1), and the right hand gas valve serves the upper assembly (No2).

a) Ensure gas & electricity supplies are turned on to the appliance. b) Switch on the boiler at the on/off switch. (See figure 20) The appliance will purge both

combustion chambers with air from the burner fans and then will pulse the pumps on/off

(venting) to push away any air that may be remaining in the heat exchangers.

19.2 LPG conversion

procedure

The Strata 1 45, 60 and 75 boilers can be converted to operate on LPG. (G31) Only the parts supplied in conversion kit# 251588 must be used. The 5.7mm injector must be installed into the outlet of each of the gas valves. The 3.5mm injectors must only be installed into the inlet of the gas valves where there is a Metering station prior to the appliance. (When installed the single inlet injector in gas valve #1 should be discarded). Using the plastic plugs supplied the aeration holes in the white premix air box mounted on the inlet of the combustion fans must be plugged according to the table below.

The data badge of the appliance must be marked to indicate the conversion has been undertaken. Refer to the commissioning section for guidance on Combustion Adjustment.

Boiler Type White Premix Air Box Front Hole White Premix Air Box Rear Hole

Strata 1 45 Plug with 8mm Plugs No Rear Hole Strata 1 60 Plug with 10mm Plugs No Rear Hole Strata 1 75 Plug with 10mm Plugs Plug Both Holes with 15mm Plugs

Dip Switches

STRATA1

19.1.1 dip switch

settings

OFF

No Mixing Valve Control Fitted

OFF

No Outside Air Sensor Fitted

OFF

Modulating Room Unit Installed

OFF

Analogue Unit 0-3V

OFF

Cascade not fitted

Cascade controls fitted

OFF

* Room unit as Remote Control ONLY

* Remote = Room unit with temperature

sensor turned off and unit acting just as a remote controller

Room unit with temperature sensor active

PWM Unit (RE2132)

* Room unit with Sensor

OFF

Pump

Divertor valve

OFF

No External

controls

(Method of charging DHW cylinder)

On/off

Room Stat

Time Clock

OFF

0-3 volt control or

0-10 volt control

via adaptor

PWM

cascade

(KKM2)

No external controls fitted.

On/Off controls fitted.

Cascade controls for multiple boilers.

Outside Air Sensor Fitted

OFF

Radiator Circuit (mt 70/50ºC)

OFF

1 x Room Unit (RE2132)

(wired directly to the boiler)

2 x Room Units (RE2132)

Off Off Remote / Remote

On Off Sensor / Remote *

On On Sensor / Sensor

Dip Switches 3 & 4

Radiator Circuit (ht 85/65ºC)

Underfloor Zone Mixing Valve Control Fitted (MR03)

Dip Switches 6 & 7 (system operating temperature)

Dip Switch 6

Dip Switch 2

Dip Switch 5

Dip Switch 4 Dip Switch 4

Dip Switch 4

Dip Switch 5

Dip Switch 1

Dip Switch 3

Dip Switch 8

Dip Switch 7

6 OFF 7 OFF Low Temp 55/45ºC

6 OFF 7 ON Med Temp 70/50ºC 6 ON 7 OFF High Temp 85/65ºC 6 ON 7 ON High Temp 85/65ºC

Sensor=

STRATA1

19.3 First Firing (contd)

c) Turn the green potentiometer

(HWS) fully clockwise(60ºC).

d) Attach U tube manometer to the

gas pressure test point on the gas supply prior to the appliance. The nominal pressure should be 20mb for NG or 37mb for LPG. (See section 8.0 page 7).

e) Press the “Engineers” test button

twice - the screen should/must display “10 min Low”. The boiler should now ignite and following stabilisation of the flame, will turn down to and hold at minimum output. In the event that ignition of one or both burners does not occur after 4 attempts the appliance will go to ignition failure lockout. Remove the cover cap screws from Qmin adjustment on gas valves (See figure 21 (2)) turn adjustment screw half turn clockwise.

Press reset button, appliance will post purge and vent again.

Press Engineers test button twice to reset appliance to “10 min Low” and ignition sequence will start again. If ignition fails again after 4 attempts, then further increase Qmin (2) on each gas valve by half turn until burners ignite.

f) Observe the colour of both

burner flames - correct colour should be dull red. Adjust colour of burner flames using Qmin (2) until flame colours are correct. Following this procedure will avoid poisoning your combustion analyser.

g) Remove flue gas analysis test point cap or plug (from top right of combustion chamber) of the

lower heat exchanger and insert probe of combustion analyser. Adjust as necessary Q min (2) of left hand valve to obtain required CO

% value. (See table 1) Make adjustments slowly and wait at least 2 minutes for reading to stabilise before re-adjusting. Remove analyser and refit cap/plug to test point. Repeat above procedure with upper heat exchanger and right hand gas valve.

Control Panel

Fig. 20

Table 1.

Display

Gas Valve

Fig. 21

Q max

Q min

Burner offset pressure test point

Adjustments

Turning 3 clockwise increases min output & CO2%

Turning 4 Anti clockwise increases max output & CO2%

ECO/ECO Plus Switch

On/Off Switch

Reset Button

Engineers Button

Test Button

Flue gas CO2 % Settings

Gas Type Nat Gas G20 LPG G31

% at min output 9.5 11.5

% at max output 9.0 11

RESET TEST

STATUS

ECO PLUS

ECO

STRATA1

a) If direct-on-boiler weather compensated flow temperatures are required, then ensure the

(supplied) outside air temperature sensor has been installed on a north facing wall away from possible heat sources and Dip switch No2 has been set to “on”.

The boiler is supplied with the compensation slope shown overleaf set as a default.

NOTE: The default slope is obtained when the red and blue potentiometers are set in the vertical position.

b) If the default settings are not applicable to the needs of the system user, then the angle of the

slope may be changed by adjustment of either the blue or red potentiometers or both.

Adjustment of the red potentiometer raises or lowers the flow temperature at low outside (design) air temperature.

Adjustment of the blue potentiometer raises or lowers the flow temperature at the end point (high) outside air temperature.

Each potentiometer has the range of +20ºC and -20ºC about the default point but with a limiting factor that the maximum flow temperature is 85’C.

See graphs following showing range of parallel displacement of the compensation slopes.

19.3 First Firing (contd)

19.4. setting weather

compensation

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.

h) Turn the green potentiometer (whilst still in “10 min Low” operation) fully anti-clockwise (20ºC).

This will set the burners to maximum output.

i) Check CO

% of upper heat exchanger and adjust as necessary screw (3) Q max of right hand

valve, to obtain required value. (See table 1)

NOTE: Adjustment of either (2) Q min or (3) Q max will affect the other adjustment to a lesser or greater extent. Following either adjustment of (2) or (3) check the effect on the setting of the other adjustment and correct as necessary.

j) Remove analyser from upper heat exchanger and refit cap/plug to test point.

k) Repeat operations described in i) and j) but on lower heat exchanger and left hand gas valve.

l) Press Engineer ’s test button once to exit 10 minute test mode.

m) Turn off electricity and gas supplies and remove manometer from inlet pressure test point and

refit test point screw.

n) Turn on gas and electricity supplies.

STRATA1

Default Compensation Slope

Max Flow Temperature

Boiler Flow Temperature ºC

Outside Air Temperature ºC

Range of Parallel Displacement of Slope A

Boiler Flow Temperature ºC

Outside Air Temperature ºC

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

Slope B - Dip 6 OFF & Dip 7 ON

Slope C - Dip 6 OFF & Dip 7 OFF

-20 -15 -10 -5

-1

RED

-20 +20

+5 +10 +15 +20 +250

-10

-20

RED

+10

+20

BLUE

-10

-20

BLUE

+10

+20

-20

-15 -10

-5

-1

default

+5 +10

+15 +20

+20

-20

+250

STRATA1

Range of Parallel Displacement of Slope B

Boiler Flow Temperature ºC

Outside Air Temperature ºC

Range of Parallel Displacement of Slope C

Boiler Flow Temperature ºC

Outside Air Temperature ºC

-10

-20

-15 -10 -5

RED

-20 +20

+5 +10 +15 +20 +250

-1

default

+20

-20

BLUE

-20

-10

-20

RED

BLUE

+10

+20

+10

+20

-20

-15 -10 -5

RED

-20 +20

+5 +10 +15 +20 +250

-1

+20

-20

BLUE

-10

-20

-10

-20

RED

BLUE

+10

+20

+10

+20

STRATA1

19.5 setting domestic

hot water temperature

19.6 service button/setting heating output,

pump speeds and minimum mixed flow temperature.

A) With HWS sensor in/on DHW Calorifier.

1) 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. This arrangement is recommended only with high/quick recovery type calorifiers.

B) With cylinder thermostat in/on DHW Calorifier.

1) Set desired stored hot water temperature by the adjustment of the cylinder thermostat. With this arrangement the “green” potentiometer on the boiler control panel has no function. With this arrangement time control of hot water charging is possible by installing a time switch in series with the cylinder thermostat, but hot water charging always takes priority over the heating demand.

The service button is located adjacent to the Dip switch block (bottom right hand of control panel) and has a number of functions.

a) Setting maximum output to heating.

The output to heating may be limited if required and may be set between 20% and 100%, by performing the following:

i) Press “red” reset button once.

Press service button once. Screen display will show “Mxhea”???>??% The figures to the left of the “>” symbol are the current settings for maximum heating output as a percentage of the maximum output of the boiler.

ii) To change the output, turn the “red” potentiometer and the figures to the right of the “>”

symbol will change. Set the required % output by adjusting the “red” potentiometer. - - equals 100%.

iii) To “store” the new setting; press the service button once. iv) If no further adjustments are required then set “red” potentiometer back to it’s original position

as this affects the compensation slope setting if compensation is active.

b) Setting maximum pump speed. (Normal setting 100%)

If it is required to limit the maximum speed of the in built boiler pumps then this may be done by the following:

i) Press “red” reset button once.

Press service button once. Press “red” reset button twice. Screen display will show “Mx pum”???>??%.

ii) To change maximum pump speed (not recommended, normally left at - - (100%) follow

procedure as in a) ii)-iv) above.

STRATA1

19.6 Service button/setting heating output. (contd)

19.7 output for charging

hot water

20. setting the boiler

to work

c) 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:

i) Press “red” reset button once.

Press service button once. Press “red” reset button three times. Screen display will show “Mn pum”???<??%

ii) To change minimum pump speed then follow procedure as in a) ii)-iv) above.

d) Setting minimum mixed flow temperature.

Only applicable where MR03 underfloor zone controller is installed. If it is required to set a minimum mixed flow temperature at the outlet of underfloor zone VT value, then this may be done by the following:

i) Press “red” reset button once.

Press service button once. Press “red” reset button four times.

ii) To set minimum mixed flow temperature follow procedure as in a) ii)-iv) above.

e) Clearing “service” message from screen display.

After a default of 365 days of an electrical supply being applied to the boiler, a message to the user is shown on the screen displaying “service”, reminding the user that the appliance should now be serviced. Following a service visit by the specialist engineer, the service message may be cancelled by pressing and holding the service button for approximately 10 seconds.

There is no adjustment necessary or possible, as the boiler controls are self learning and will self adapt the optimum output to hot water according to the heat transfer capabilities of the connected hot water calorifier or cylinder.

1. To fit casing to boiler ensure hooks on top rear edge of boiler case engage properly into rear chassis assembly. Latch bottom case fixings and tighten central locking screw.

2. Turn ON on/off switch and set any external controls to auto operation.

3. Set ECO/ECO plus switch to ECO position for systems without additional heating circuit pump OR Set ECO/ECO plus switch to ECO plus position for systems with a local low velocity header and additional heating circuit pump.

4. With boiler operating (burners on) press “Test” button on boiler control panel to test overheat controls in the boiler. The boiler must shut-down and then re-ignite.

STRATA1

21. servicing

instruction

21.2 maintenance

21.1 inspection

GENERAL

In general, maintenance/inspections should take place:

a) When the display on the unit indicates that inspection is required (status shows “SERVICE”).

b) At least every 12 months, before carrying out any maintenance the unit must be inspected.

a) Ask the user about any problems with the boiler unit or any other comments.

b) Check the water pressure of the installation.

c) Remove the casing of the unit and inspect all pipes and connections for water leaks.

d) Inspect the top of the casing and/or the top of the upper heat exchanger for water leaks or signs

of water from the flue air supply tube.

e) Open the siphon cleaning rinsing point at the base of the unit and drain syphon into a

suitable receptacle.

f) If you have a notebook computer, connect it and check the service page for any errors,

messages, starts and successful restarts. (Special communication lead and service software required)

g) Run the unit at maximum capacity and measure the input and the CO

h) Run the unit at minimum capacity and measure the input and the CO

i) Listen to the sound of the in built pumps.

j) Disassemble each burner by removing the six M6 nuts around the burner door, removing the

ignition cable and pulling the burner forwards.

When the burner has been pulled forwards to halfway across the burner area, the plug on the fan cable must be removed from the fan motor.

Check the interior of the heat exchanger.

k) Disassemble the plastic box at the suction side of the fan, inspect the fan blades.

l) Check the distance between the electrode and the burner; this should be 4 to 5 mm.

m) Check water treatment dosage level.

Depending on the results of the inspection, carry out any maintenance and if necessary any preventive maintenance.

Possible actions include:

at a) The remarks and comments of the client must be taken seriously and the cause(s) of any faults

or problems must be found.

STRATA1

21.2 maintenance (contd)

at b) 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.

at c) Possible leaks or weeping must be resolved immediately.

at d) In case of water leakage or ingress from the air supply pipe, the cause must be found.

at e) The siphon must be rinsed. With the burners removed, use a filling hose to insert water into

the heat exchanger, which will automatically reach the siphon. Rinse volume should be a minimum of 2 litres.

at f) Draw your conclusions from the service screen and attend to those parts that have caused any

faults.

at g) and at h)

If necessary, adjust the gas setting on the gas valves.

at i) If the in built pumps make an un-natural noise, and in particular if the pumps are more than 5

years old, it is recommended that the pumps should be replaced by way of preventive action.

Note the pumps are fully modulating and do have characteristic “yet yet” noise which is normal at low speeds.

at j) NEVER CLEAN THE BURNER ITSELF.

If the interior of the heat exchanger is contaminated and/or there is a deposit on the surfaces of the coiled stainless steel pipes, the latter must be removed with a hard brush or citric acid. (DO NOT USE A STEEL BRUSH !) Then remove any dirt with a vacuum cleaner.

at k) If dirt has deposited on the fan blades, each blade must be carefully cleaned, until the blade

material is visible again. If this is not done evenly the fan will not rotate properly and be out of balance.

at l) Carefully bend the electrode without touching the burner, until the correct distance has been

reached.

IMPORTANT NOTE

IF ANY WATER CARRYING JOINT WITHIN THE BOILER IS DISASSEMBLED THEN THE “O” RING SEAL MUST ALWAYS BE REPLACED, LIKEWISE IF ANY OTHER SEAL IS NOTED TO BE DEFORMED THEN THEY SHOULD ALSO BE REPLACED.

WATER SEALING “O” RINGS ARE A ONE TIME USE ONLY AND SHOULD NOT BE RE-USED.

Cancelling the Service Message

Following the maintenance operations, the service message (when displayed) must be cancelled. This is done by pressing and holding in the service button for at least 10 seconds.

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). The first line contains text information about the status of the unit.

It shows:

STATUS MESSAGES (NON FLASHING) FOR NORMAL OPERATION

Standby No heat demand (boiler not required to be on)

Pre-purge Combustion chambers are being pre-ventilated with air from the burner fans

Ignition The ignition sequence of the burners is initiated

Heat-operate The boiler is operating in central heating mode

Tap-operate The boiler is operating to produce domestic hot water

Flue-emission The boiler is operating in test mode at mid output to enable flue gas emissions to be

checked (auto expires after 10 min)

10 min Low The boiler is operating in engineers test mode for adjustment purposes (auto expires

after 10 min)

Post-purge Combustion chambers are being post-ventilated with air following boiler operation

Limit F/R The flow and/or return temperature is too high (currently)

Fan 1 high The lower burner fan is running too fast (currently)

Fan 1 low The lower burner fan is running too slow (currently)

Fault room u There is a fault with the modulating unit (RE2132) or Cascade manager (KKM2) or a

fault in the wiring to these controls (in the case of the RE2132 the boiler runs continuously in heating mode to protect the building)

Fault outsid There is a fault in the outside air sensor or in the wiring to the sensor or the dip

switches are incorrectly set to ask the boiler to look for an outside sensor when there is none installed

Service The service interval time has expired and the boiler should now be maintained

Serv. Button The service button is being depressed

Fan 2 high The upper burner fan is running too fast (currently)

Fan 2 low The upper burner fan is running too slow (currently)

Venting The in built pumps are operating to remove any possible collection of air from the heat

exchangers. (Occurs when power turned off/on and after reset of fault)

The second line of text displays values such as temperature, percentages etc and the red reset button may be used to scroll through (for information) the values of the various sensors that are/may be connected in the boiler plus fan speeds and pump speed etc.

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.

for each flashing display message there is a possible cause, see list of cause numbers following the “flashing status” list.

DISPLAY MESSAGE MEANING CAUSE NUMBER/S FLASHING

Wat 1 Lockout Lower ht/exch high limit stat has 5,6,7,8,21,24,25,26,31

tripped.

Wat 2/Flue Lo Upper ht/exch high limit or flue 2,5,6,7,8,21,24,25,26,31

limit stat has tripped

Fan 1 high Lower burner fan speed is too high 9,11,29,31,33

Fan 1 low Lower burner fan speed during

pre-purge is too low 9,10,11,14,18,29,31,33

Fan 1 oper Lower burner fan is detected as 3,4,11,29,31

operating when should be idle

Ignit 1 fault Ignition to lower burner has not 12,13,15,16,17,19,22,

been successful after 4 attempts 23,27,29,30,31,35

Flame 1 out Flame at lower burner has been 13,15,17,19,20,23

lost on 4 consecutive occasions during operation

Flame 1 on w/ Flame is detected at the lower 17,19,30

burner when there should be no flame

S1 interrupt Lower ht/exch flow temperature

sensor interrupted 3,5,33

S3 interrupt Upper ht/exch flow temperature 3,5,33

sensor interrupted

S4 interrupt Return temperature sensor 3,5,33

interrupted

S7 interrupt Mixed flow temperature sensor 1,3,5,33

interrupted. Only when MR03 unit installed

Program end Follows reprogramming of control

panel with laptop PC, not a fault

- just press reset button

Fan 2 high Upper fan speed too high 9,11,29,31,33

STRATA1

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

Ignit 2 fault Ignition to upper burner has not 12,13,15,16,17,20,22

been successful after 4 attempts 23,27,29,30,31,35

Flame 2 out Flame at upper burner has been 13,15,17,20,23

lost on 4 consecutive occasions during operation

Gas valve Connection to gas valve interrupted 26,28,29,31,33

Soft fault Error in software in the control 29

Reset button There is a fault with the reset 29,31,34

button

Eeprom There is a fault in the EEPROM 29

in the control

22.1 screen display/diagnosis of faults (contd)

22.2 (possible) causes of fault

& corrective action

CAUSE REASON/ACTION

No.

1 - Dip switches not set correctly / Check and correct settings

2 - Unsound electrical connections to flue limit stat / Check and correct

3 - Sensor not correctly connected or sensor defective/Check connections and or

replace sensor

4 - Short circuit in wiring / Check and rectify

5 - Short circuit in wiring to sensor / Check and rectify

6 - Boiler pumps not rotating (seized or defective)/Free seized shaft or if defective replace

pump

7 - System lacks water / Investigate, refill and vent

8 - Connections to heat exchanger limit stat unsound /check & rectify

9 - Unsound electrical connection to fan / Check integrity of fan connection plug

10 - Fan blades heavily contaminated / Clean fan

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 - Oxidation on burner mounting screws. Loosen and retighten screws.

17 - Poor ignition lead connection to electrode or damp connection or lead damaged

and shorting to earth / Check and rectify

18 - Transformer defective / Replace transformer

19 - Condense siphon is blocked or condense waste blocked or frozen / Clear siphon or

waste pipe

20 - Flue gas leakage from connection at rear of heat exchanger / Check, reposition or

replace seal

21 - System strainer blocked ?, isolation valve closed ? Or some other interruption to water

flow / Check and rectify

22 - Unacceptably high resistance in flue or air supply tubes or flue blocked / Check flue

for suitability or clear obstruction

23 - Leakage of flue gas from flue gas tube into air tube vitiating the combustion air / Strip

out flue system and remake joints

24 - Zone pumps not running / Check and rectify

25 - Heat exchangers fouled internally with silt or scale / Clean, descale heat exchangers

and system and re-dose system with water treatment

26 - Heat exchanger high limit stat defective / Replace limit stat

27 - Boiler set for wrong gas type / Convert boiler to burn the gas being supplied

28 - Flue gas limit stat defective / Replace limit stat

29 - Boiler control panel defective / Replace control panel

30 - Incorrect position of ignition electrode / Reset gap 4-5mm

31 - moisture in-on electrical connections or components / Dry carefully using warm air

from a hair dryer

32 - Incorrect electrical connection / Check and rectify

33 - Wiring interrupted (broken wire) / Check and rectify

34 - reset button stuck / Press button in attempt to free sticking contacts. If no success

then replace control panel

35 - Ignition electrode damaged or broken / Replace electrode23. User instructions

STRATA1

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.

23.1 To turn on the appliance

1 - Ensure the pressure gauge indicates a pressure within the system of not less than 0.5bar.

2 - Ensure the gas supply is turned on.

3 - Switch on the on/off switch on the appliance control panel.

4 - If all controls connected to the boiler are calling for heat the screen will display

Heat-Operat or Tap Operat.

5 - If all controls are in the off position the screen will display standby.

23.2 To turn off the appliance

1 - Switch off the on/off switch on the appliance control panel.

2 - Turn off the gas supply.

NOTE: Turning off the appliance will leave the system at risk of freezing during winter months and will put out of action the automatic pump exercising routine. If the only reason for shutdown is that normal heating is not required, then it is recommended to leave the boiler on and turn off or turn down any external controls.

23.0 instructing

the user

STRATA1

24.0 Strata 1 45,60,75

exploded view

QW/0102/4575

STRATA1

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.

A member of the Modular Heating Group Plc

MHS Boilers STRATA1, STRATA1 60, STRATA1 45, STRATA1 70 Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual