Sime MERIDIAN HE 25 Installation And Servicing Instructions

Brand: Sime

Model: MERIDIAN HE 25

Category: Water heaters & boilers

Type: Installation And Servicing Instructions

This manual is also suitable for

BRAVA DGT HE 35

MERIDIAN

HE 30 C

Installation and

servicing instructions

UK ENSURE THAT THESE INSTRUCTIONS ARE LEFT

FOR THE USER AFTER COMPLETION OF THE

BENCHMARK SECTION

Please read the Important Notice within

this guide regarding your boiler warranty

199838

All descriptions and illustrations provided in this manual have been carefully prepared but we reserve the right to make changes

and improvements in our products that may affect the accuracy of the information contained in this manual.

This boiler may require 2 or more operatives to move it into its installation site, remove it from its packaging and during

movement into its installation location. Manoeuvring the boiler may include the use of a sack truck and involve lifting pushing

and pulling.

Caution should be exercised during these operations.

Operatives should be knowledgeable in handling techniques when performing these tasks and the following precautions

should be considered:

– Grip the boiler at the base

– Be physically capable

– Use personal protective equipment as appropriate e.g. gloves, safety footwear.

During all manoeuvres and handling actions, every attempt should be made to ensure the following unless unavoidable

and/or the weight is light.

– Keep back straight

– Avoid twisting at the waist

– Always grip with the palm of the hand

– Keep load as close to the body as possible

– Always use assistance

WARNING

Caution should be exercised when performing any work on this appliance.

Protective gloves and safety glasses are recommended.

– Avoid direct contact with sharp edges.

– Avoid contact with any hot surfaces.

NOTICE

Please be aware that due to the wet testing of the appliance, there may some residual water in the hydraulic circuit.

– Protect any surfaces, carpets or floorings.

– Use a suitable container to catch any water that escape when removing the protective caps from the connections.

SAFE HANDLING

IMPORTANT NOTICE

For the first year all of our appliances are protected by our manufacturer’s guarantee which covers both parts and

labour.

As you would expect from Sime Ltd, it is our aim to provide our valued customers with the best in after sales and

service.

To take advantage of any extended warranty offered, all you have to do is to adhere to these 3 simple conditions:

• The installation must be carried out to Manufacturers/Benchmark Standards by a Gas Safe Registered

Engineer, and recorded in the installation manual.

• The appliance must be registered with both Sime Ltd and Gas Safe within 30 days of installation.

• The appliance must be serviced annually, by either Sime Ltd or a Gas Safe registered engineer- ensuring that the

Benchmark service record in the installation manual is completed.

Failure to comply with the above will result in only the 12 month warranty being offered.

In the absence of any proof of purchase, the 12 month warranty period will commence from the date of manufacture

of the boiler as shown on the appliance data plate.

The Benchmark Scheme

Sime Ltd is a licensed member of the Benchmark Scheme which aims to improve the standards of installation and

commissioning of domestic heating and hot water systems in the UK and to encourage regular servicing to optimi-

se safety, efficiency and performance.

Benchmark is managed and promoted by the Heating and Hotwater Industry Council.

For more information visit www.centralheating.co.uk

Please refer to commissioning instructions for filling in the checklist at the back of this installation guide.

Note: All Gas Safe registered installers carry a ID Card.

You can check your installer is Gas Safe Registered by calling 0800 408 5577

CONTENTS

1 DESCRIPTION OF THE BOILER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 6

2 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 10

3 CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 17

4 USE, MAINTENANCE (including BENCHMARK) AND COMMISSIONING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 21

5 FAULT FINDING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 27

6 REPLACEMENT OF PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 27

7 EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 30

8 APPENDIX 1 (GUIDANCE HHIC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 35

9 APPENDIX 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 47

SIME COMBINATION BOILERS

Installer checklist

Please remember to carry out the following checks after installation. This will achieve complete customer satis-

faction, and avoid unnecessary service calls. A charge will be made for a service visit where the fault is not due to

a manufacturing defect.

– Has a correct by-pass been fitted and adjusted?

– Has the system and boiler been flushed?

– Is the system and boiler full of water, and the correct pressure showing on the pressure gauge?

– Is the Auto Air Vent open?

–Has the pump been rotated manually?

– Is the gas supply working pressure correct?

– Is the boiler wired correctly? (See installation manual).

– Has the customer been fully advised on the correct use of the boiler, system and controls?

– Has the Benchmark Checklist in the use and maintenance section of this manual, been completed ?

IPX4D

Important Information

IT IS A STATUTORY REQUIREMENT THAT ALL GAS APPLIANCES ARE INSTALLED BY COMPETENT PERSONS, IN

ACCORDANCE WITH THE GAS SAFETY (INSTALLATION AND USE) REGULATIONS (CURRENT EDITION). The manu-

facturer’s instructions must not be taken as overriding any statutory requirements, and failure to comply with these

regulations may lead to prosecution.

No modifications to the appliance should be made unless they are fully approved by the manufacturer.

GAS LEAKS: DO NOT OPERATE ANY ELECTRICAL SWITCH, OR USE A NAKED FLAME. TURN OFF THE GAS SUPPLY

AND VENTILATE THE AREA BY OPENING DOORS AND WINDOWS CONTACT THE GAS EMERGENCY SERVICE ON

0800111999.

Meridian HE 30 C: Gas Council number 47-283-46

These appliances comply with the S.E.D.B.U.K. scheme, band “A”

TABLE 2 - Minimum clearances

For servicing

ABOVE THE APPLIANCE CASING 300 mm

AT THE R.H.S. 15 m m

AT THE L.H.S. 15 m m

BELOW THE APPLIANCE CASING 200 mm

IN FRONT OF THE APPLIANCE 500 mm

TABLE 1 - Connections

R C.H. return 22 mm Compression

M C.H. flow 22 mm Compression

G Gas connection 15 mm Compression

E D.H.W. inlet 15 mm Compression

U D.H.W. outlet 15 mm Compression

S3 Condensation outlet ø 20

S Safety valve discharge

1.1 INTRODUCTION

MERIDIAN HE 30 C are premixed gas con-

densation thermal modules that employ a

microprocessor-based technology to con-

trol and manage all the functions. All modu-

les are compliant with European Directives

2009/142/CE, 2004/108/CE,

2006/95/CE and 92/42/CE. For opti-

mum installation and operation, always fol-

low the instructions provided in this

manual. The products manufactured and

sold by Sime do not contain any banned

materials or substances (ie they comply

with ISO9000:2000).

1 DESCRIPTION OF THE BOILER

164

183

65 65

70 60

39 50 30

794

750 97

60/100

139

126

450 ==

RE GUMREGUM

Fig. 1

1.2 DIMENSIONS (fig. 1)

MERIDIAN HE 30 C

Heat output

Nominal (80-60°C) kW 28.9

Nominal (50-30°C) kW 31.6

Reduced G20 (80-60°C) kW 5.9

Reduced G20 (50-30°C) kW 6.6

Reduced G31 (80-60°C) kW 7.6

Reduced G31 (50-30°C) kW 8.5

Heat input nominal kW 29.5

Heat input reduced G20/G31 kW 6.2/8.0

Max/min useful yield (80-60°C) % 98.0/95.1

Max/min useful yield (50-30°C) % 107.1/106.4

Useful yield at 30% of the load (40-30°C) %107.0

Termal efficiency (CEE 92/42 directive) 

Losses after shutdown to 50°C (EN 483) W89

Supply voltage V-Hz 230-50

Adsorbed power consumption W115

Electrical protection grade IP X4D

C.H. setting range °C 20/80

Water content boiler l 4.60

Maximum water head bar 3.0

Maximum temperature °C 85

Capacity of the heating expansion vessel l8

Pressure of the heating expansion vessel bar 1.0

D.H.W. setting range °C 10/60

D.H.W. flow rate (EN 625) l/min 13.4

Continuous D.H.W. flow rate ∆t 30°C l/min 14.4

Minimum D.H.W. flow rate l/min 2.2

D.H.W. pressure min/max bar 0.5/6.0

Exhaust fumes temper. at max flow rate (80-60°C)

°C 79

Exhaust fumes temper. at min. flow rate (80-60°C)

°C 67

Exhaust fumes temper. at max flow rate (50-30°C)

°C 51

Exhaust fumes temper. at min. flow rate (50-30°C)

°C 47

Smokes flow min/max kg/h 11/50

CO2at max/min flow rate G20 % 9.0/9.0

CO2at max/min flow rate G31 % 10.0/10.0

CE certification n° 1312CN5755

Category II2H3P

Type B23P-53P/C13-33-43-53-83

NOx emission class 5

Weight when empty kg 33.6

Main burner nozzle

Quantity nozzles n° 2

G20 nozzle diameter diversified ø 2.8/3.8

G31 nozzle diameter diversified ø 2.2/2.9

Consumption at maximum/minimum flow rate

G20 m3/h 3.12/0.66

G31 kg/h 2.29/0.62

Gas supply pressure G20/G31 mbar 20/37

1.3 TECHNICAL FEATURES

22 24

1.4 FUNCTIONAL DIAGRAM (fig. 2)

Fig. 2

KEY

1Fan

2 Limit stat

3 Primary exchanger

4 C.H. sensor (SM)

5 Gas valve

6 D.H.W. exchanger

8 Diverter valve

9 Safety thermostat

10 Pump with air release vent

11 D.H.W. flow switch

12 Water inlet filter

14 Pressure relief valve

15 Water pressure switch

16 Automatic bypass

17 Drain vent

18 Expansion vessel

19 Condensate drain trap

21 D.H.W. isolation valve

22 Gas isolation valve

23 C.H. flow isolation valve

24 C.H. return isolation valve

25 D.H.W. sensor (SS)

CONNECTIONS

R C.H. return

M C.H. flow

G Gas connection

E D.H.W. inlet

U D.H.W. outlet

S3 Condensation outlet

S Safety valve discharge

bar

Fig. 3

1.5 MAIN COMPONENTS (fig. 3)

KEY

1 Control panel

2 Condensate drain trap

3 C.H. sensor (SM)

4 Safety thermostat

5 Ignition electrode

6 Programming clock

7 Primary exchanger

8 Air release vent

9 Limit stat

10 Exhaust temperature sensor

11 Smoke chamber

12 Expansion vessel

13 Air inlet

14 Ionisation electrode

15 F a n

16 Pressure relief valve

17 Air release vent

18 Pump

19 D.H.W. sensor (SS)

NOTE: Analogue pressure gauge

It is important that the boiler is initially

filled and started for the first time using

the method shown in 2.3.3 section e).

This procedure should also be used when

refilling after draining a boiler.

The boiler must be installed in a fixed loca-

tion and only by specialized and qualified per-

son in compliance with all instructions con-

tained in this manual.

The installation of this boiler must be in

accordance with the relevant requirements

of the current Gas Safety (installation and

use), the local building regulations, and and

I.E.E. wiring regulations. Detailled recom-

mendations for air supply are given in

BS5440:2. The following notes are for gen-

eral guidance: it is not necessary to have a

purpose provided air vent in the room or

compartment in which the appliance is

installed.

2.1 ANTI-FREEZE FUNCTION

The boilers are equipped with anti-freeze

function which activates the pump and the

burner when the temperature of the water

contained inside the appliance drops to

below value PAR 10.

The anti-freeze function can only operate if:

– the boiler is correctly connected to the

gas and electricity supply circuits;

– the boiler is switched on;

– the boiler ignition is not locked out;

– the essential components of the boiler

are all in working order.

In these conditions the boiler is protected

against frost down to an environmental

temperature of -5°C.

ATTENTION:

In the case of installation in a place where

the temperature drops below 0°C, the

connection pipes must be protected.

2.2 FIXING THE WALL

MOUNTING BRACKET (fig. 4)

– Mark the position of the two wall mount-

ing bracket fixing holes and the flue/air

duct hole on the appropriate wall(s).

–

Drill the two fixing holes using a 10 mm

masonry drill and fit the plastic plugs provided.

– Accurately measure the wall thickness,

and note this dimension for later use.

– Secure the wall mounting bracket in

position using the screws provided.

Ensure that it is the correct way up, as

indicated in fig. 4.

2.3 CONNECTING

UP SYSTEM

Before connecting the boiler it is recom-

mended that the system be flushed in

accordance to BS 7593, to eliminate any

foreign bodies that may be detrimental to

the operating efficiency of the appliance.

When connecting up the boiler the clear-

ances in fig 1 should be respected.

The boiler is supplied with a valve pack part

number 5184817A. The boiler can be filled

and pressure tested prior to any electrical

supply being connected with the use of the

analogue pressure gauge.

A safety valve set at 3 bar is fitted to the

appliance, the discharge pipe provided

should be extended to terminate safely

away from the appliance and where a dis-

charge would not cause damage to per-

sons or property but would be detected.

The pipe should be a minimum of 15 mm Ø

and should be able to withstand boiling

water, any should avoid sharp corners or

upward pipe runs where water may be

retained.

Gas Connection

The gas connection must be made using

seamless steel or copper pipe.

Where the piping has to pass through walls,

a suitable insulating sleeve must be provid-

ed. When sizing gas piping, from the meter

to the boiler, take into account both the vol-

ume flow rates (consumption) in m3/h and

the relative density of the gas in question.

The sections of the piping making up the sys-

tem must be such as to guarantee a supply

of gas sufficient to cover the maximum

demand, limiting pressure loss between the

gas meter and any apparatus being used to

not greater than 1.0 mbar for family II gases

(natural gas).

An adhesive data badge is sited inside the

front panel; it contains all the technical data

identifying the boiler and the type of gas for

which the boiler is arranged.

2.3.1 Connection of condensation

water trap

To ensure safe disposal of the condensate

produced by the flue gases, reference

should be made to BS6798:2009.

The boiler incorporates a condensate trap

which has a seal of 75 mm, therefore no

additional trap is required. The advised

method of connection to the condensate

trap is by using 20 mm overflow pipe with a

socket attached to cover the condensate

trap connection.

The condensate should ideally be dis-

charged internally into an internal waste

pipe(washing machine/sink waste) or a soil

pipe to avoid the risk of freezing.

External pipe runs should be avoided, but

if it is necessary, the pipework should be

at least 32mm and protected from the

risc of freezing with a waterproof insula-

tion and the length kept to a minimum

and not exceeding 3 m. termination

should be into an external gully or pur-

pose made soakaway.

2 INSTALLATION

KEY

1 Wall mounting bracket

2 Plastic wall plug (2 Off)

3 Woodscrew (2 Off)

4 Washer (2 Off)

Fig. 4

NOTE: All pipework must have a continu-

ous fall from the boiler and must be resis-

tant to corrosion by condensate, copper

or steel is NOT suitable.

It should be noted that the connection of a

condensate pipe to a drain may be subject

to local building control requirements.

2.3.2 Dealing with condensate

See APPENDIX A for guidance on the dis-

posal of condensate.

2.3.3 Requirements for sealed water

systems (fig. 5)

The heating system design should be based

on the following information:

a) The available pump head is given in fig.

14.

b) The burner starts if the system pres-

sure is sufficient to operate the pres-

sure switch.

c) The appliance is equipped with an inter-

nal by-pass that operates with system

heads (H) greater than 3 m. The maxi-

mum flow through the by-pass is about

300 l/h. If thermostatic radiator valves

are to be installed, at least one radiator

should be without a thermostatic valve

(usually the bathroom radiator or the

radiator in the room containing the

room thermostat).

d) A sealed system must only be filled by a

competent person using a method simi-

lar to that shown in fig. 5. The system

design should incorporate the connec-

tions appropriate to one of these meth-

ods.

e) It is most important that the boiler is

not allowed to ignite until it and the

heating system is filled.

Ensure that the electrical supply to the

boiler is turned off.

Open the auto air vent, 17 fig 3.

Fill the system to approximately 1.5 bar.

Use the manual air vent located on the

uppermost connection to the primary

heat exchanger (item 8 fig. 3) to

release any air retained, and ensure

that all the radiators are vented.

Top up the system pressure to 1.5 bar.

Turn on the power supply to the boiler

and put the boiler in the Summer mode.

While in the Summer mode, adjust the

heating flow temperature to its mini-

mum 20 degrees. Put the boiler into

the Winter mode and allow it to ignite.

Run the boiler in this mode for approxi-

mately 30 minutes, regularly checking

that trapped any air is released. and

gradually increasing the flow tempera-

ture to 60 degrees. When inhibitor is

added repeat this procedure with the

initial flow temperature at 20 degrees.

The flow temperature should then be

set to the desired value.

NOTE: If the domestic water supply is

metered, or should a water meter be

added at a later time, a small expansion

vessel should be included on the Domestic

hot water pipework.

2.4 CHARACTERISTICS

OF FEEDWATER

– All recirculatory systems will be subject

to corrosion unless an appropriate

water treatment is applied.

This means that the efficiency of the

system will deteriorate as corrosion

sludge accumulates within the system,

risking damage to pump and valves, boil-

er noise and circulation problems.

– For optimum performance after instal-

lation this boiler and its associated cen-

tral heating system must be flushed in

accordance with the guidelines given in

BS 7593 “Treatment of water in

domestic hot water central heating sys-

tems”.

Sime Ltd recommend only the use of

FERNOX products for the flushing and

final treatment of the system water.

This is particularly important in hard

water areas.

Artificially softened water must not be

used to fill the heating system.

METHOD OF FILLING A SEALED SYSTEM

Fig. 5

– It is important to check the inhibitor

concentration after installation, system

modification and at every service in

accordance with the manufacturer’s

instructions (Test kits are available from

inhibitor stockists).

FLUES INSTALLATION MUST COMPLY

WITH THE CURRENT VERSION OF

BS5440.

2.5 INSTALLATION COAXIAL DUCT

ø 60/100 - ø 80/125 (fig. 6)

The coaxial suction and discharge pipes are

supplied in a special kit (that can be purcha-

sed separately) along with assembly

instructions.

The diagrams of fig. 6 illustrate some

examples of different types of fluing options

allowed and the maximum lengths that can

be reached.

2.6 INSTALLATION OF SEPARATE

DUCTS ø 80 (fig. 7)

The kit with dedicated pipes enables to

separate the exhaust fumes pipes from the

air suction pipes (fig. 7):

–for ø 80 pipes, adaptor code 8093050 is

available upon request.

The maximum overall length, resulting

from the sum of all the suction and

discharge pipes, is determined by the

load losses of the single connected acces-

sories and should not exceed 15 mm H2O

(version 25-30) (ATTENTION: the total

length of each pipe should not exceed 50

m, even if the total loss is below the maxi-

mum applicable loss.)

See Table 3 for information on the load los-

ses of single accessories (fig. 8).

2.6.1 Separate ducts kit

(fig. 8)

The diagrams of Figure 8 show a some of

examples of the permitted exhausts confi-

gurations.

C33

C43

x + y = L (m)

H (m)

C13

L (m)

LIST OF ø 60/100 ACCESSORIES

1Coaxial duct kit L. 790 code 8096250

2a Extension L. 1000 code 8096150

2b Extension L. 500 code 8096151

3Vertical extension L. 140 with coupling code 8086950

5Tile for joint code 8091300

6Terminal for roof exit L. 1285 code 8091212

(includes 8086950)

Model Length of pipe Length of pipe

ø 60/100 ø 80/125

HV H V

Min Max Min Max

MERIDIAN HE 30 C 5 m 1.3 m 7 m 10 m 1.2 m 13 m

LIST OF ø 80/125 ACCESSORIES

1 Coaxial duct kit L. 785 code 8096253

2a Extension L. 1000 code 8096171

2b Extension L. 500 code 8096170

3Adapter for ø 80/125 code 8093150

5Tile for joint code 8091300

6 Terminal for roof exit L. 1285 code 8091212A

(includes 8093150)

H (Horizontal) m

V (Vertical) m

IMPORTANT:

– The insertion of each additional 90° bend with a diameter of 60/100 (code 8095850)

reduces the available section by 1.5 meters.

– The insertion of each additional 90° bend with a diameter of 80/125 (code 8095870)

reduces the available section by 2 meters.

– Each additional 45° curve installed a diameter of 60/100 (code 8095550) reduces the

available length by 1.0 metres.

– Each additional 45° curve installed a diameter of 80/125 (code 8095970) reduces the

available length by 1.0 metres.

HORIZONTAL FLUES MUST BE LEVEL

NOTE: Before connecting accessories, it is always advisable to lubricate the internal part of

the gaskets with silicon products. Avoid using oils and greases.

Fig. 6

2.7 POSITIONING THE

OUTLET TERMINALS (fig. 9)

The outlet terminals for forced-draught

appliances may be located in the external

perimeter walls of the building.

To provide some indications of possible solu-

tions, Table 4 gives the minimum distances

to be observed, with reference to the type

of building shown in fig. 9.

2.9 ELECTRICAL CONNECTION

The boiler is supplied with an electric cable.

Should this require replacement, it must be

replaced with one of similar type and dimen-

sions.

The electric power supply to the boiler must

be 230V - 50Hz single-phase through a 3 amp

fused main switch, with at least 3 mm spacing

between contacts.

Respect the L and N polarities and the earth

connection.

NOTE: SIME declines all responsibility for injury

or damage to persons, animals or property,

resulting from the failure to provide for proper

earthing of the appliance, or incorrect connec-

tion of external controls. Any fault or compo-

nent failure due to incorrect connection of

external controls is not covered in the warranty.

120

183

139 18 5

185

CS CA

130 (vers. HE 35)

Fig. 7

KEY

1 Adaptor with vent

2 Air intake

3 Exhaust

CA Inlet

CS Outlet

C33

12 12

Fig. 8

C13

NOTE

Before connecting accessories, it is

always advisable to lubricate the inter-

nal part of the gaskets with silicon

products. Avoid using oils and grea-

ses.

TABLE 3 MERIDIAN HE 30 C

Load loss - mm H2O

Inlet Exhaust

1 Air/smoke divider, code 8093050 0 0

2 90° bend, code 8077450 0.25 0.30

3 a Extension 80mm L. 1000, code 8077351 0.20 0.20

3 b Extension 80mm L. 500, code 8077350 0.10 0.10

7 45° bend, code 8077451 0.20 0.20

9 Inlet/ exhaust fitting, code 8091401 -- --

10 Articulated tile, code 8091300 -- --

11 Vertical roof terminal, code 8091212B * 1.10 0.15

13 Inlet/ exhaust fitting, code 8091401 -- --

14 Coaxial Terminal, code 8096253A * 1.10 0.15

* This loss includes the losses with use of item 9 or 13

– If the terminal discharges into a pathway or passageway

check that combustion products will not cause nuisance and

that the terminal will not obstruct the passageway.

– Where the lowest part of the terminal is fitted less than 2 m

(78 in) above ground, above a balcony or above a flat roof to

which people have access, the terminal MUST be protected

by a purpose designed guard.

– Where the terminal is fitted within 850 mm (34 in) of a plas-

tic or painted gutter, or 450 mm (18 in) of painted eaves, an

aluminium shield at least 1,500 mm (59 in) long must be fit-

ted to the underside of the painted surface.

– The air inlet/outlet flue duct MUST NOT be closer than 10

mm (0.4 in) to combustible material.

– In certain weather conditions the terminal may emit a plume

of steam. This is normal but positions where this would

cause a nuisance should be avoided.

Terminal position Minimum spacing

ADirectly below an openable window, air vent

or any other ventilation opening 300 mm 12 in

BBelow guttering, drain pipes or soil pipes (*) 75 mm 3 in

C/D Below eaves, balconies or carport roof 200 mm 8 in

EFrom vertical drain pipes or soil pipes 75 mm 3 in

FFrom internal or external corners 300 mm 12 in

GAbove adjacent ground, roof or balcony level 300 mm 12 in

HFrom a boundary or surface facing the boiler 600 mm 24 in

IFrom a terminal facing the terminal 1,200 mm 48 in

JFrom an opening in the carport

(eg door, window into dwelling) 1,200 mm 48 in

KVertically from a terminal on the same wall 1,500 mm 60 in

LHorizontally from a terminal on the same wall 300 mm 12 in

MHorizontally from a vertical terminal to a wall 300 mm 12 in

NHorizontally from an openable window or other opening 300 mm 12 in

PAbove an openable window or other opening 300 mm 12 in

QFrom an adjacent vertical terminal 600 mm 24 in

(*) For condensing boilers this distance can be reduced to 25 mm without effecting boiler per-

formance, but it will be necessary to protect the surfaces from the effects of condensate

TABLE 4

Fig. 9

2.9.1

Climatic control option

The boiler is designed for connection to an

external temperature sensor, supplied on

request (code 8094101) in conjunction

with remote control (code 8092226),

which can automatically regulate the tem-

perature value of the boiler output accor-

ding to the external temperature.

For installation, follow the instruction in the

package. Expansion control kit 8092240

will also be required.

2.9.2 External wired controls

The heating function of the boiler can be

controlled by voltage free signal, TA, con-

nected to terminals 5 & 6 after removal of

the link.

2.9.3 Use with

different

electronic

systems

Some examples are given below of boiler

systems combined with different electronic

systems.

Where necessary, the parameters to be

set in the boiler are given.

The electrical connections to the boiler

refer to the wording on the diagrams (fig.

11). Zone valve control is activated with

every heating request from remote con-

trol.

Description of the letters indicating the

components shown on the system dia-

grams 1 to 3:

M C.H. flow

R C.H. return

CR Remote control CR 63

SE External temperature sensor

TA 1-2 Zone room thermostat

VZ 1-2 Zone valve

RL 1-2 Zone relay

Sl Hydraulic separator

P 1-2 Zone pump

EXP Expansion card

(code 8092240)

For guidance only, flues should be installed in accordance with BS5440

2 BASIC SYSTEM

MULTI-ZONE SYSTEM WITH VALVE, ROOM THERMOSTAT AND EXTERNAL SENSOR (Code 8094101)

TA1

VZ1

TA2

VZ2

1 BASIC SYSTEM

SYSTEM WITH A DIRECT ZONE AND ROOM THERMOSTAT, OR WITH A REMOTE CONTROL (Code 8092219), KIT

EXPANSION REMOTE CONTROL (Code 8092240) AND EXTERNAL SENSOR (Code 8094101)

EXP

TA1 TA2

RL1 RL2

3 BASIC SYSTEM

MULTI-ZONE SYSTEM WITH PUMP, ROOM THERMOSTATS AND EXTERNAL SENSOR (Code 8094101)

2.10 BOILER ELECTRICAL (fig. 11)

TA (24 VDC)

SE (3.3 VDC)

(3.3 VDC)

SM (3.3 VDC)

(24 VDC)

TL (3.3 VDC)

TFU

TS (3.3 VDC)

EV 1-2

FL (12 VDC)

SF (3.3 VDC)

EXP

(24 VDC)

TRA

Fig. 11

KEY

F Fuse (1.6 AT)

TRA Ignition transformer

PI Pump

VFan

EA Ignition electrode

ER Ionisation electrode

EV1-2 Gas valve coil

VD Divertor valve

OP Programming clock

SM C.H. sensor

TS Safety thermostat

TFU Thermal fuse

TL Limit stat

FL D.H.W. flow switch

SF Exhaust temperature sensor

PA Water pressure switch

TA Room thermostat

SE External sensor (optional)

SS D.H.W- sensor

EXP Expansion card remote control (optional)

NOTE: Connect a voltage free room thermostat TA to

terminals 5 & 6 after removal of the link.

CONNECTOR SPARE PART CODES:

CN3 code 6319158

CN4 code 6323856

CN5 code 6316253

CN6 code 6323861

CN7 code 6323860

3 CHARACTERISTICS

3.1 CONTROL PANEL (fig. 12)

1 - DESCRIPTION OF DISPLAY ICONS

SUMMER MODE ICON

WINTER MODE ICON

D.H.W. MODE ICON

HEATING MODE ICON

BURNER LIT ICON

LOCKOUT DUE TO NO

IGNITION/FLAME DETECTION

RESET REQUIRED

MAIN DIGITS

Fig. 12

2 - DESCRIPTION OF CONTROLS

OPERATING MODE/RESET

Press this key repeatedly to step from standby to

summer to winter. The green LED will flash accompa-

nied by a audible signal, to indicate that the key has

been pressed. Press the key for more than two

seconds to enter standby. RESET is only available if a

re-settable error is signalled.

D.H.W. SET

Press the key to display the D.H.W. temperature

value set

HEATING SET

Press the key to display the heating flow temperature

value set (value not realtive to the remote control)

DECREASE

Pressing this key decreases the value set

INCREASE

Pressing this key increases the value set

3 - LED GREEN

ON = Indicates the presence of electrical voltage.

It switches of momentarily every time the keys are pressed.

It can be disabled by setting PAR 3 = 0.

4 - LED RED

OFF = Normal operation

ON = Boiler error signalled

Flashing when the control panel buttons are pressed inside the

PARAMETERS SECTION.

3.2 ACCESS TO INSTALLER'S

PARAMETERS

For access to the installer's parameters,

press simultaneously the ( and ) keys

for 5 seconds.

The red LED flashes and the display shows :

The parameters can be scrolled with

or .

To enter the parameter press or .

The value set flashes, the display shows :

Proceed as follows to change the set value:

– set the new value using or .

– confirm the set value using or .

Press to exit the parameters section. The

display is shown automatically after 5 minu-

tes. The parameters section contains the

alarms log, info and meters (display only).

3.2.1 Replacing the board or

RESETTING parameters

If the electronic board is replaced or reset

or the type of gas used is changed, it is

necessary to configure PAR 01 and PAR

02 by associating the following values to

each type of boiler to be able to restart the

boiler:

NOTE: the boiler panel has a label with

the values that have to be set for PAR 01

and PAR 02 (fig. 19).

BOILER PAR 2

D.H.W. flow meter 01

With storage tank 03

Heating only 04

D.H.W flow switch 09

D.H.W. flow switch

with D.H.W. sensor 13

PARAMETERS INSTALLER

FAST CONFIGURATION

PAR DESCRIPTION RANGE UNIT OF INC/DEC DEFAULT

MEASUREMENT UNIT SETTING

01 Combustion configuration -- = ND = = “--”

1 ... 20

02 Hydraulic configuration -- = ND = = “--”

1 ... 13

03 Disabling of the green LED 0 = Disabled = = 01

1 = Enabled

04 Correction of external probe values -5 ... 05 °C 1 00

05 Default time for keypad locking -- = Disabled Min. 1 15

1 ... 99

09 Fan rpm Step ignition 00 .... 81

rpm x 100

0,1 from 0,1 to 19,9

1from 20 to 81

D.H.W. - HEATING

PAR DESCRIPTION RANGE UNIT OF INC/DEC DEFAULT

MEASUREMENT UNIT SETTING

10 Frost protection temperature 0 ... 10 °C 1 03

11 External sensor antifreeze -- = Disabled °C 1 - 2

- 9 ... 05

12 Climatic curve setting 03 ... 40 = 1 20

13 Minimum heating temperature 20 ... PAR 14 °C 1 20

14 Maximum heating temperature PAR 13 ... 80 °C 1 80

15 Maximum heating power 30 ... 99 % 1 99

16 Post-circulation time 0 ... 99 10 sec. 1 03

17 Pump heating activation delay 0 ... 99 10 sec. 1 01

18 Re-ignition delay 0 ... 10 Min. 1 03

19 Flow meter modulation saturation band 0 ... 99 % 1 30

29 Anti-legionella (only D.H.W. tank) O = Disabled = = 0

1 = Enabled

PARAMETERS RE-SET

PAR DESCRIPTION RANGE UNIT OF INC/DEC DEFAULT

MEASUREMENT UNIT SETTING

49 * Reset default parameters -- , 1 = = =

(PAR 01 - PAR 02 equal “---”)

* To reset the circuit board to the default settings, set PAR49 to 1.

PAR1 and PAR2 will need to be set as shown in 3.2.1.

ALARMS (Display)

PAR DESCRIPTION RANGE UNIT OF INC/DEC DEFAULT

MEASUREMENT UNIT SETTING

A0 Code of last error = = = =

A1 Code of last error - 1 = = = =

A2 Code of last error - 2 = = = =

A3 Code of last error - 3 = = = =

A4 Code of last error - 4 = = = =

A5 Code of last error - 5 = = = =

A6 Code of last error - 6 = = = =

A7 Code of last error - 7 = = = =

A8 Code of last error - 8 = = = =

A9 Code of last error - 9 = = = =

INFO (Display)

PAR DESCRIPTION RANGE UNIT OF INC/DEC DEFAULT

MEASUREMENT UNIT SETTING

i0 External sensor temperature -9 ... 99 °C 1 =

i1 C.H. 1 sensor temperature -9 ... 99 °C 1 =

i2 C.H. 2 sensor temperature -9 ... 99 °C 1 =

i3 Fumes sensor temperature -9 ... 99 °C 1 =

i4 Auxiliary sensor AUX temperature -9 ... 99 °C 1 =

i5 Set of effective heating temperature PAR 13 ... PAR 14 °C 1 =

i6 Level ionization flame 00 ... 99 % 1 =

i7 Fan speed 00 ... 99 100 rpm 1 =

i8 Flow rate D.H.W. flow meter 00 ... 99 l/min 1 =

COUNTERS (Display)

PAR DESCRIPTION RANGE UNIT OF INC/DEC DEFAULT

MEASUREMENT UNIT SETTING

c0 Number hours of operation of the burner 00 ... 99 h x 100

0,1 from 0,0 to 9,9

1from 10 to 99

c1 Number of ignitions of the burner 00 ... 99 x 1000

0,1 from 0,0 to 9,9

1from 10 to 99

c2 Total number of errors 00 ... 99 x 1 1 00

Number accesses of Installer parameters

00 ... 99 x 1 1 00

Number of accesses of OEM parameters

00 ... 99 x 1 1 00

GAS MODELS PAR 1

METHANE

(G20) 30 C 02

PROPANE

(G31) 30 C 05

3.3 EXTERNAL SENSOR (fig. 13)

If there is an external sensor, the heating

settings SET can be taken from the climatic

curves according to the external tempera-

ture and, limited to with the range values

described in point 3.2 (parameters PAR 13

and PAR 14).

The climatic curve to be set can be selected

from a value of 3 and 40 (at step 1).

Increasing the steepness of the curves of

fig. 14 will increase the output temperature

as the external temperature decreases.

3.5 CARD FUNCTIONING

The electronic card has the following

functions:

– Antifreeze protection of the heating cir-

cuits.

– Ignition and flame detection system.

– Control panel setting for the power and

the gas for boiler functioning.

– Anti-jammed for the pump which is fed

for a few seconds (10”) after 48 hours of

inactivity.

– Chimney sweep function which can be

activated from the control panel.

– Temperature which can be shifted with

the external sensor connected.

– Automatic regulation of the ignition

power and maximum heating.

Adjustments are managed automatically

by the electronic card to guarantee maxi-

mum flexibility in use of the system.

3.6 TEMPERATURE

DETECTION SENSOR

Table 4 shows the resistance values of the

heating, D.H.W. and fumes sensor.

If the C.H. sensor (SM) and fumes sensor

(SF) is faulty or open circuit, the boiler

will not function on either heating or

D.H.W.

If the D.H.W. sensor (SS) is faulty or open

circuit, the boiler will function on either

heating and D.H.W. (ALL 10).

3.6 ELECTRONIC

IGNITION

Ignition and flame detection is controlled by

electrodes on the burner which guarantees

reaction in the case of accidental extinction

or lack of gas within one second.

3.6.1 Functioning cycle

Burner ignition should occur within 10

seconds of the opening of the gas valve. If

after three attempts the ignition is not

detected the boiler will lockout (ALL 06):

–Lack of gas

The ignition electrode will discharge for a

maximum of 10 seconds. If after three

attempts the ignition is not detected the

boiler will lockout (ALL 06).

This can happen the first time a boiler is

switched on, or after long periods of inac-

tivity. It can also be caused by a closed

gas cock or a gas valve not operating.

–No ionisation

The boiler will spark for 10 seconds, if

after 3 attempts the ionisation is not

detected, the boiler will lockout (ALL 06).

This could be due to a poor connection or

break in the ionisation cable.

Check also that the cable is not shorted,

badly worn or distorted.

In the case of a sudden loss of voltage, the

burner will immediately switch off. When

the voltage is restored, the boiler will auto-

matically start up again.

3.7 HEAD AVAILABLE

TO SYSTEM (fig. 14 )

Residual head for the heating system is

shown as a function of rate of flow in the

graph in fig. 14.

3.8 WATER PRESSURE

SWITCH (fig. 15)

The water pressure switch (8) intervenes,

blocking burner functioning, if it detects

that there is insufficient pressure in the

boiler (< 0,6 bar).

To restore the boiler operation, increase

the system pressure to 1 - 1,2 bar.

TABLE 4 (SM - SS - SF sensors)

Temperature (°C) Resistance (Ω)

20 12.090

30 8.313

40 5.828

50 4.161

60 3.021

70 2.229

80 1.669

Fig. 13

ATTENTION: curves are calculated at an ambient temperature of 20°C.

The user can act on the boiler controls to change the environment set

for which the bend has been calculated by ±5°C.

600

200 12001000800600400

PORTATA (l/h)

PREVALENZA RESIDUA (mbar)

500

400

100

200

300

MERIDIAN HE 25-30

HE 30 - HE 30 C

HE 25

PO RTATA PREVALENZA

(l/h) RESIDUA (mbar)

0512

100 500

200 487

300 468

400 443

500 412

600 377

700 338

800 294

900 246

1030 169

PO RTATA PREVALENZA

(l/h) RESIDUA (mbar)

0515

100 485

200 480

300 471

400 462

500 445

600 423

700 391

800 352

900 300

1050 222

HE 25 HE 30 - HE 30 C

Fig. 15

Fig. 14

RESIDUAL HEAD (mbar)

FLOW RATE (l/h)

KEY

1 Condensate drain trap

2 Diverter valve

3 D.H.W. exchanger

4 Gas valve

5 D.H.W. flow switch

6 Pressure relief valve

7 Pump with air release vent

8 Water pressure switch

9 Boiler discharge

10 D.H.W. sensor (SS)

FLOW RATE

(l/h)

FLOW RATE

(l/h)

RESIDUAL HEAD

(mbar)

RESIDUAL HEAD

(mbar)

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Sime MERIDIAN HE 25 Installation And Servicing Instructions

Brand: Sime

Model: MERIDIAN HE 25

Category: Water heaters & boilers

Type: Installation And Servicing Instructions

This manual is also suitable for

BRAVA DGT HE 35

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Sime MERIDIAN HE 25 Installation And Servicing Instructions

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Sime MERIDIAN HE 25 Installation And Servicing Instructions

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