MHS Boilers STRATA1 Series Guida utente

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) m3/h

Input Rate LPG G31 (max) m3/h

Minimum/Maximum Gas Pressure mbar

Flue Gas Volume (Hot) m3/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

41.3

45.2

4.7

1.76

18/60

100

3.0

0.5

230

3.0

115

54.7

59.9

5.9

2.33

18/60

100

3.0

0.5

230

3.0

115

69.1

75.6

7.6

2.95

18/60

104

100

3.0

0.5

230

3.0

115

108

229

458

231

435

123

950

front - all models

plan - models 45/60/75

12567 8

38 108

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

11/4" BSP-M

80mm

125mm

3/4" BSP

3/4" BSP-M

11/4" BSP-M

80mm

125mm

3/4" BSP

3/4" BSP-M

11/4" BSP-M

80mm

125mm

3/4" BSP

3/4" 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 NOTlift 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.

458

170

3 x ø7.0

170

735 900

165

Gas Connection

3/4" BSP Male

Fig 2.

Fig 1.

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 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 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 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 3/4" BSP Male threaded stub fabricated from

plastic. The installer must connect to this stub, a condense waste pipe fabricated

from plastic tube and fittings (3/4", 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.

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