Sime ECOMFORT SYSTEM 25 HE, ECOMFORT 30 HE, ECOMFORT 35 HE, Ecomfort System Plus 25 HE, Ecomfort Plus 25 HE Installation And Servicing Instructions

Ecomfort

Installation and

servicing instructions

GB

Ecomfort System 25 HE: Ecomfort 25 HE:

Gas Council number 41-283-04 Gas Council number 47-283-06

Ecomfort 30 HE: Ecomfort 35 HE:

Gas Council number 47-719-25 Gas Council number 47-283-04

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

Please refer to commissioning instructions for filling in the log book

Note: All CORGI registered installers carry a CORGI ID Card.

You can check your installer is CORGI Registered by calling 01256 372300

CONTENTS

1 DESCRIPTION OF THE BOILER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 3

2 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 7

3 CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 15

4 USE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 18

5 FAULT FINDING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 21

6 REPLACEMENT OF PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 24

7 EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pag. 26

SIME COMBINATION BOILERS

Installer checklist

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

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

turing 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 D.H.W. flow rate been set to the customer requirements?

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

– Has the log book provided been completed?

– Has the Aquaguard Filter been cleaned (see 4.9)?

– Has the condensate trap been filled (see section 2)?

IPX4D

3

1.1 INTRODUCTION

“ECOMFORT” is a boiler that has a con-

densing heat exchanger downstream from

the fan to allow the heat contained in
exhaust fumes to be recovered.
The boiler is equipped as standard with
frost protection and circulating pump anti-

jamming system.
The instructions given in this manual are
provided to ensure proper installation and
correct operation of the appliance.

1 DESCRIPTION OF THE BOILER

70

70

70

70

50

30

55

55

22

718

25

12 5

60

335

450

245

16 5

ø 60/100

90

700

1.2 DIMENSIONS

TABLE 1/a - Connections “ECOMFORT 25 HE - 30 HE - 35 HE”

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

TABLE 2 - Minimum clearances

For ventilation For servicing

ABOVE THE APPLIANCE CASING 400 mm 300 mm

AT THE R.H.S. 15 m m 15 m m

AT THE L.H.S. 15 m m 15 m m

BELOW THE APPLIANCE CASING 200 mm 200 mm

IN FRONT OF THE APPLIANCE 100 mm 500 mm

TABLE 1 - Connections “ECOMFORT SYSTEM 25 HE”

R C.H. return 22 mm Compression

M C.H. flow 22 mm Compression

G Gas connection 15 mm Compression

S3 Condensation outlet ø 20

245

19 0

ø 80/125

16 5

55

55

22

30

50

700

450

25

12 5

60

335

70

70

70 70

=

=

R

M

G

EU

S3

718

G

Fig. 1

ECOMFORT SYSTEM 25 HE
ECOMFORT 25-30 HE

ECOMFORT35 HE

4

1.3 TECHNICAL FEATURES

ECOMFORT SYSTEM 25 HE 25 HE 30 HE 35 HE

Heat output nominal (80-60°C) kW 24.7 24.7 29.1 33.5

Heat output nominal (50-30°C) kW 26.5 26.5 31.2 36.0

Heat output minimum (80-60°C) kW 9.5 9.5 12.7 12.5

Heat output minimum (50-30°C) kW 10.0 10.0 13.6 13.0

Heat input nominal kW 25.5 25.5 30.0 34.8

Heat input minimum kW 10.2 10.2 13.5 13.5

Efficiency min./nom. output (80-60°C) % 93.6/97.0 93.6/97.0 94.4/96.9 92.7/96.3

Efficiency min./nom. output (50-30°C) % 98.2/103.9 98.2/103.9 100.5/103.9 96.7/103.4

Seasonal efficiency rating (SEDBUK) (B) (B) (B) (B)

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

Class NOx 3 3 3 3

Smokes temperature maximum (80-60°C) °C 78 78 80 88

Smokes temperature minimum (80-60°C) °C 74 74 74 80

Smokes temperature maximum (50-30°C) °C 50 50 51 55

Smokes temperature minimum (50-30°C) °C 42 42 44 48

Smokes flow kg/h 57.3 57.3 65.0 71.0

CO2 maximum/minimum G20 % 6.1/2.2 6.1/2.2 7.3/3.1 7.3/2.6

CO2 maximum/minimum G30/G31 % 7.5/2.8 7.5/2.8 8.5/3.5 8.8/3..1

Adsorbed power consumption W 150 150 160 160

Electrical protection grade IP X4D X4D X4D X4D

CE certification n° 1312BQ4473 1312BQ4473 1312BQ4473 1312BQ4473

Category II2H3+ II2H3+ II2H3+ II2H3+

Type

B22-52/C12-32-42-52-82 B22-52/C12-32-42-52-82 B22-52/C12-32-42-52-82 B22-52/C12-32-42-52-82

WEIGHT kg 41 43 43 43

CENTRAL HEATING

Maximum water head bar 3 3 3 3

Maximum temperature °C 85 85 85 85

Water content boiler l 5.0 5.0 5.0 5.0

C.H. setting range °C 30/80 30/80 30/80 30/80

Expansion vessel capacity l 8 8 8 8

Expansion vessel pressure bar 1 1 1 1

DOMESTIC HOT WATER

Minimum/Maximum pressure bar - 0.5/7.0 0.5/7.0 0.5/7.0

D.H.W. flow rate (EN 625) l/min - 11.5 13.0 14.7

Continuous D.H.W. flow rate ∆t 30° C l/min - 11.8 13.8 15.8
Continuous D.H.W. flow rate ∆t 35° C l/min - 10.1 11.9 13.0

D.H.W. setting range °C - 30/60 30/60 30/60

GAS PRESSURE AND NOZZLES

Gas supply pressure G20 mbar 20 20 20 20

Gas supply pressure G30 mbar 28-30 28-30 28-30 28-30

Gas supply pressure G31 mbar 37 37 37 37

Nozzles quantity n° 12 12 14 15

Nozzles diameter G20 ø 1.30 1.30 1.30 1.30

Nozzles diameter G30/G31 ø 0.77 0.77 0.77 0.80

Burner gas pressure min./max. G20 mbar 2.0/11.5 2.0/11.5 2.6/11.5 2.2/13.5

Burner gas pressure min./max. G30 mbar 4.8/28.5 4.8/28.5 6.3/28.5 4.5/28.2

Burner gas pressure min./max. G31 mbar 4.8/36.5 4.8/36.5 6.3/36.2 4.5/36.2

C.H gas consumption G20 m3/h 2.70 2.70 3.17 3.68

C.H. gas consumption G30 kg/h 2.01 2.01 2.37 2.74

C.H. gas consumption G31 kg/h 1.98 1.98 2.33 2.70

1

23

4

5

7

8

9

11

14

15

13

18

19

20

25

2624

17

16

S3

RMG

5

20

19

21

22

23

24

25

26

RMGEU

18

14

15

13

11

12

9

10

7

8

6

5

4

1

2

3

17

S3

16

KEY

1 Post-condenser
2 Smoke stat 95°
3 Fan
4 Main exchanger
5 SM sensor (thermister)
6 Aqua Guard Filter System
7 Safety stat 100°
8 Thermometer sensor

9 Gas valve
10 D.H.W. exchanger
11 Water flow switch
12 Divertor valve
13 Automatic by-pass
14 Circulating pump
15 Auto air vent
16 Expansion vessel
17 Condensation water trap
18 Safety valve
19 Temperature/pressure gauge

20 Boiler drain
21 D.H.W. filter
23 D.H.W. inlet cock

24 Gas cock

25 C.H. flow cock
26 C.H. return cock

R C.H. return
M C.H. flow
G Gas connection
E D.H.W. inlet
U D.H.W. outlet
S3 Condensation outlet ø 20

1.4 FUNCTIONAL DIAGRAM

Fig. 2

ECOMFORT SYSTEM 25 HE

ECOMFORT 25 - 30 - 35 HE

6

1.5 MAIN COMPONENTS

Fig. 3

KEY

1 Water flow switch
2 Water trap
3 Safety stat 100°
4 Aqua Guard Filter System
5 Main exchanger
6 SM sensor (thermister)
7Fan
8 Smoke stat 95°

9 Smoke pressure switch
10 Positive test point
11 Post-condenser
12 Combustion chamber
13 Ignition/ionization electrode
14 Burner
15 Gas valve
16 Automatic air vent
17 Control panel
18 Negative test point

WATER SENSOR

ECOMFORT SYSTEM 25 HE

ECOMFORT 25 - 30 - 35 HE

7

The boiler must be installed in a fixed loca­tion and only by specialized and qualified per­son in compliance with all instructions con­tained in this manual. The boiler should be
installed in accordance with the Gas Safety
Regulations.

It is important that the condensate trap
be filled prior to operating the boiler. The
trap can be filled by pouring water care­fully into the inner flue connection prior to
installation of the flue. Care should be
taken not to allow any water to enter the
outer flue.

2.1 VENTILATION REQUIREMENTS

Detailled recommendations for air supply
are given in BS5440:2. The following notes
are for general guidance:
– It is not necessary to have a purpose pro-

vided air vent in the room or compart­ment in which the appliance is installed.

2.3 CONNECTING UP SYSTEM

Before proceeding to connect up the boiler,
you are recommended to flush out the sys­tem in order to eliminate any foreign bodies
that might be detrimental to the operating
efficiency of the appliance. When making
the hydraulic connections, make sure that
the clearances indicated in fig. 1 are
respected. To facilitate the hydraulic con­nections the boiler is equipped with a valve
pack code 5184817 complete with instruc­tions sheet. 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 discharge would not cause damage to
persons 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.

The gas connection must be made using
seamless steel or copper pipe
(Mannesmann type), galvanized and with
threaded joints provided with gaskets,
excluding three-piece connections, except
for initial and end connections. Where the
piping has to pass through walls, a suitable
insulating sleeve must be provided. When
sizing gas piping, from the meter to the boil­er, take into account both the volume flow
rates (consumption) in m

3

/h and the rela­tive density of the gas in question. The sec­tions of the piping making up the system
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

The drip board and its water trap must be
connected to a civil drain through a pipe
with a slope of at least 5 mm per metre to
ensure drainage of condensation water.

The plastic pipes normally used for civil
drains are the only type of pipe which is
appropriate for conveying condensation
to the building’s sewer pipes.

2.3.2 Requirements for

sealed water systems

The heating system design should be based
on the following information:
a)

The available pump head is given in fig. 16.

b) The burner starts when the C.H. flow

reaches 400÷450 l/h. This safety con­dition is ensured by the flow switch.

c) The appliance is equipped with an inter-

nal by-pass that operates with system
heads (H) greater than 3 m. The maxi­mum 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).

d) A sealed system must only be filled by a

competent person using one of the
approved methods shown in fig. 4. The
system design should incorporate the
connections appropriate to one of these
methods.

2.4 CHARACTERISTICS OF FEEDWATER

– All recirculatory systems will be subject

to corrosion unless an appropriate
water treatment is applied. This means
that the ef ficiency of the system will
deteriorate as corrosion sludge accu-

mulates within the system, risking dam­age to pump and valves, boiler noise
and circulation problems.

–

For optimum performance after installa­tion this boiler and its associated central
heating system must be flushed in
accordance with the guidelines given in
BS 7593 “Treatment of water in domes­tic hot water central heating systems”.

– This must involve the use of a propri-

etary cleanser, such as Sentinel X300
or X400, or Fernox Superfloc. Full
instructions are supplied with the prod­ucts, but for immediate information
please contact GE Betz (0151 420

9563) or Fernox (01799 550 811)
directly.

– For long term protection against corro-

sion and scale, af ter flushing it is rec­ommended that an inhibitor such as
Sentinel X100, or Fernox MB-1 or Copal
is dosed in accordance with the guide­lines given in BS 7593.

Failure to flush and add inhibitor to
the system may invalidate the appli­ance warranty.

– 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).

– At every service the Aquaguard Filter

(4.9) should be checked and cleaned.

2.5 COAXIAL DUCT ø 60/100
(only for “25-30 HE models”)

The air inlet-smoke outlet assembly, code
8096250, is included in the standard sup­ply of the appliance complete with mounting
instructions.

NOTE: to use only special accessories for
condensing boilers.

2 INSTALLATION

ALTERNATIVE METHODS OF FILLING A SEALED SYSTEM

Fig. 4

2.5.1 Coaxial flue diaphragm

The boiler is normally supplied with ø 87.5
diaphragm (fig. 4/a).

ATTENTION: the diaphragm should be
used only when the length of the coaxial
duct is below 1 m (only for “25 HE”
model).

2.5.2 Coaxial duct accessories

The accessories to be used for this type of
installation and some of the connecting sys­tems that may be adopted are illustrated in
fig. 5.

With the pipe bend included in the kit, the
maximum length of the piping should not
exceed 3.0 meter. When the vertical
extension code 8086950 is used, the ter­minal par t of the pipe must always come
out horizontally.

2.6 COAXIAL DUCT ø 80/125
(only for “35 HE” model)

The air inlet-smoke outlet assembly ø
80/125 is supplied in a kit code 8096253
complete with mounting instructions.

With the pipe bend included in the kit, the
maximum length of the piping should not
exceed 3.0 meter.

The diagrams in fig. 7/a illustrate a num­ber of examples of different coaxial outlets
ø 80/125.

Fig. 5

KEY
1a-b Coaxial duct kit code 8096250
2 Extension L. 1000 code 8096150
3 Vertical extension L. 140

with take-off point code 8086950
4 a 90° additional bend code 8095850
4 b 45° additional bend code 8095950

max 3.0 m

NOTE: Place the duct horizontally.

NOTE: Before instal­ling accessories,
lubricate the internal
part of gaskets with
silicon-based pro­ducts. Avoid using
oils and greases.

IMPORTANT:
– Each additional 90° curve installed reduces

the available length by 1.0 metres.

– Each additional 45° curve installed reduces

the available length by 0.50 metres.

ONLY FOR “25 HE” MODEL

Fig. 4/a

8

Only for “25-30 HE” models

9

C12

C32

C42

2

7

6

4

1

2

max 4 m

3

x

y

x + y = max 3 m

3

2

1

max 3 m

Fig. 5/a

KEY
1 Coaxial duct kit code 8096253
2 a Extension L. 1000 code 8096171
2 b Extension L. 500 code 8096170
3 Adapter ø 80/125 code 8093150
4 a 90° additional bend code 8095870
4 b 45° additional bend code 8095970
6

Hinged tile code 8091300

7 Coaxial roof exit terminal L. 1285 code 8091205

IMPORTANT:
– Each additional 90° cur ve installed reduces the available length by 1.0 metres.
– Each additional 45° cur ve installed reduces the available length by 0.50 metres.

Only for “35 HE” model

2.7 POSITIONING
THE OUTLET TERMINALS

The outlet terminals for forced-draught
appliances may be located in the external

perimeter walls of the building.
To provide some indications of possible solu­tions, Table 3 gives the minimum distances
to be obser ved, with reference to the type
of building shown in fig. 6.

2.8 SEPARATE PIPES ø 80
(Optional alternative twin
pipe system)

A special kit may be used to separate the

10

Terminal position Minimum spacing
A Directly below an openable window, air vent

or any other ventilation opening 300 mm 12 in

B Below guttering, drain pipes or soil pipes 75 mm 3 in
C/D Below eaves, balconies or carport roof 200 mm 8 in
E From ver tical drain pipes or soil pipes 75 mm 3 in
F From int ernal or external cor ners 300 mm 12 in
G Above adjacent ground, roof or balcony level 300 mm 12 in
H From a surface facing the terminal 600 mm 24 in
I From a terminal facing the terminal 1,200 mm 48 in
J From an opening in the carpor t

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

K Vertically fr om a terminal on the same wall 1,500 mm 60 in
L Horizont ally from a terminal on the same wall 300 mm 12 in
M Horizontally from a ver tical terminal to a wall 300 mm 12 in
N Horizontally from an openable window or other opening 300 mm 12 in
P Above an openable window or other opening 300 mm 12 in

TABLE 3

– If the terminal discharges into a pathway or passageway check that combus-

tion 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. Terminal guards
are available from Quinnell, Barrett, and Quinnell, Old Kent Road, London. State
model C2, (G.C. Part No 382946).

– Where the terminal is fitted within 850 mm (34 in) of a plastic or painted gut-

ter, or 450 mm (18 in) of painted eaves, an aluminium shield at least 1,500
mm (59 in) long mus t be fitted t o the underside of the painted surface.

– The air inlet/outlet flue duct MUST NOT be closer than 25 mm (1 in) to com-

bustible 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.

Fig. 6

11

flue gas outlet from the fresh air intake (fig.

7).

The maximum overall length of the intake
and exhaust ducts depends on the head
losses of the single fittings installed
(excluding the doublers) and must not be
greater than 9.0 mm H2O (“25 HE”
model) - 7.0 mm H2O (“30 HE” model) and

4.0 mm H2O (“35 HE” model).

For head losses in the fittings, refer to Table

4.

NOTE: To use only special accessories for
condensing boilers.

2.8.1 Separate pipe accessories

Kit code 8089912 is supplied for this pur­pose (fig. 8).

2.9 ELECTRICAL CONNECTION

The boiler is supplied with an electric cable.
Should this require replacement, it must be
purchased exclusively from SIME.
The electric power supply to the boiler must
be 230V - 50Hz single-phase through a
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.

2.9.1 Electrical board (fig. 12)

Before performing any kind of operation,

disconnect the unit from the power supply

using the bipolar switch of the plant.

Placing the boiler selector in position “OFF”

does not disconnect the electric board

from the power supply.

Remove the three screws (9) fixing the con-

trol board, and pull forward the panel until it

tilts downwards. In order to gain access to

the electrical board components, unscrew

the four screws fixing the control panel

cover.

2.9.2 Room thermostat (fig. 12)

After having removed the jumper, connect
electrically the room thermostat to termi­nals 1-2 of the junction box (8).

In order to have better room comfort and
temperature control, we suggest you to
use a room thermostat belonging to
Class II, as specified by standard
EN60730.1 (clean contact).

KEY
1 Gasket ø 125/95
2 Fixing screw
3 Flue outlet flange
4 Inlet air diaphragm

115

ø 80

ø 80

110

16 5

255

10 0

245

Fig. 7

TABLE 4

Accessories ø 80 Head loss (mm H2O) “25 HE” model Head loss (mm H2O) “30/35 HE” model

Inlet Outlet Roof outlet Inlet Outlet Roof outlet

90° elbow MF 0.30 0.40 – 0.30 0.45 –
45° elbow MF 0.20 0.30 – 0.20 0.35 –
Extension L. 1000 (horizontal) 0.20 0.30 – 0.20 0.35 –
Extension L. 1000 (vertical) 0.30 0.20 – 0.30 0.25 –
Outlet terminal – 0.30 – – 0.35 –
Inlet terminal 0.10 – – 0.10 – –
Doubler fitting 0.20 – – 0.30 – –
Roof outlet terminal L. 1381 – – 0.50 – – 0.55

1

2

3

4

N° segments Total load loss mm H2O

to remove “25 HE” model

- 0 ÷ 2,0

n° 1 2,0 ÷ 3,0
da n° 1 a 3 3,0 ÷ 4,0
da n° 1 a 4 4,0 ÷ 5,0
da n° 1 a 5 5,0 ÷ 6,0
da n° 1 a 7 6,0 ÷ 7,0
da n° 1 a 9 7,0 ÷ 8,0

without diaphragm 8,0 ÷ 9,0

Fig. 8

N° segments Total load loss mm H2O

to remove “30 HE” model

n° 1 e 2 0 ÷ 2,0
da n° 1 a 3 2,0 ÷ 3,0
da n° 1 a 4 3,0 ÷ 4,0
da n° 1 a 6 4,0 ÷ 5,0
da n° 1 a 8 5,0 ÷ 6,0

without diaphragm 6,0 ÷ 7,0

N° segments Total load loss mm H2O

to remove “35 HE” model

da n° 1 a 8 0 ÷ 1,0
da n° 1 a 9 1,0 ÷ 2,0

da n° 1 a 10 2,0 ÷ 3,0

without diaphragm 3,0 ÷ 4,0

12

8

125

4

67

9

Fig. 12

ATTENTION: After having removed the three screws (9) tilt
the panel downwards to gain access.

KEY
1 Thermohydrometer
2 Time programmer (optional)
4 Main PCB
5 Earth faston
6 Control panel protection
7 Cover (TA)
8 Connector (TA)
9 Fixing screw

IMPORTANT

Before performing any kind of operation, disconnect the unit

from the power supply using the bipolar switch of the plant.

Placing the boiler selector in position “OFF” does not disconnect

the electric board from the power supply.

13

JUMPERS

JP4

CN1

CN6 (cód. 6299987)

CN7 (cód. 6299924)

CN2 (cód. 6299988)

WHITE

GREY

95 °C SMOKE STAT

TERMINAL
BOARD

100 °C SAFETY STAT

RELAY

Fig. 13

2.9.3 ECOMFORT SYSTEM 25 HE wiring diagram

NOTE:
– The room thermostat (TA) may be connected to the terminals 1.
– To remote control the boiler connect an external clock to the terminals 1-2 (24 V) of the “TA” connector and set the

built-in clock to “constant” mode (see user instructions for details).

JUMPERS POSITION AND FEATURES

JUMPER POSITION AND FEATURE SUPPLY POSITION

CLOSED OPEN

JP4 - METANO/GPL Ready to function with LPG Ready to function with natural gas Open

WATER SENSOR

14

JUMPERS

JP4

CN1

CN6 (cód. 6299923)

CN7 (cód. 6299924)

CN2 (cód. 6299988)

95 °C SMOKE STAT

TERMINAL
BOARD

100 °C SAFETY STAT

Fig. 13/a

2.9.4 ECOMFORT 25 - 30 - 35 HE wiring diagram

NOTE:
– The room thermostat may be connected to the terminals 15-16 (CN1) of the “TA” connector af ter having removed the

link.

– To remote control the boiler connect an external clock to the terminals 1-2 (24 V) of the “TA” connector and set the

built-in clock to “constant” mode (see user instructions for details).

JUMPERS POSITION AND FEATURES

JUMPER POSITION AND FEATURE SUPPLY POSITION

CLOSED OPEN

JP4 - METANO/GPL Ready to function with LPG Ready to function with natural gas Open

WATER SENSOR

15

3.1 ELECTRONIC BOARD

The electronic board is manufactured in
compliance with the EEC 73/23 low-volta­ge directives. It is supplied with 230V. The
electronic components are guaranteed
against a temperature range of 0 up to
+60°C. An automatic and continuous
modulation system enables the boiler to
adjust power to the various system requi­rements or the user’s needs.

3.1.1 Fault and malfunction signaling

The indicator LEDS signaling irregular
and/or incorrect operation of the equip­ment are indicated in fig. 14.

3.1.2 Devices

The electronic board is equipped with the
following devices (fig. 15):

– Connector “JP4” (4)

With the connector disconnected, the
boiler is ready to function with METHANE;
with the connector connected with GPL.

ATTENTION: It is essential that the opera­tions described above be carried out by
authorized technical staff.

3.2 TEMPERATURE SENSOR

Antifreeze system managed by active hea­ting NTC sensor when water temperature
is 6°C. The heating sensor works also as a

limit thermostat which switches off the bur­ner when temperature is over 90°C.

When sensor (SM) is interrupted, neither
of the boiler's heating services will func­tion.

Table 5 shows the resistance values (Ω)

obtained on the heating sensor as the tem­perature varies.

3 CHARACTERISTICS

Fig. 14

121045

3

7
8

9

Fig. 15

TABLE 5

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

KEY

1 Jumper JP2
2 Fuse (1,6 AT)
3 D.H.W. potentiometer
4 Connector “JP4”
5 Rotay switch
7 Block red led
8 C.H. potentiometer
9 Bi-colour led gree/orange

10 Connector “TA”

Bi-colour green led off if power is cut-off.

Bi-colour orange led: C.H. sensor (SM) fault.

Green led flashing: fan/smoke pressure switch.

F

lashing orange led no water circulation.

Flashing red led indicates a problem in the line post-condenser.

Red led on, ignition blocked/safety stat /smoke stat tripped:

turn the rotar y switch in the position ( )

to restore functioning

16

3.3 ELECTRONIC IGNITION

Ignition and flame detection is controlled by
a sole electrode located on the burner. It
guarantees maximum safety with interven­tion times, for accidental switching off or
gas failure, within one second.

3.3.1 Operating cycle

Rotate the selector knob to summer or win­ter, and verify that green LED ( ) lights up
to confirm the presence of voltage.
The burner must be ignited within 10
seconds max.
However, it is possible for ignition failures to
occur, with consequent activation of “locked
out” signal:

– Gas failure

The electrode continues spark discharge
for a maximum of 10 sec. If the burner
does not light, the board - after a 5
second ventilation stop - reactivates
discharge for further 10 seconds. This
cycle will be repeated 5 times, after that,
the lock-out red LED will light up.

This may occur upon first ignition or after

long periods of boiler lay-off when there is
air in the pipes.
It may be caused by the gas cock being
closed or by one of the valve coils having
a break in the winding, so that the valve
cannot open.

– Ignition electrode fails to spark

The electrode continues spark discharge
for a maximum of 10 sec. If the burner
does not light, the board - after a 5
second ventilation stop - reactivates
discharge for further 10 seconds. This
cycle will be repeated 5 times, after that,
the lock-out red LED will light up.

This may be due to a break in the wire of

the electrode or to the wire not properly
fastened to the ignition transformer ter­minal.
The electrode itself may touch earth or
may be heavily worn out and needs repla­cing. The electronic board is defective.

When there is a sudden voltage failure, the
burner shuts down immediately; when the
power supply returns, the boiler will start
up again automatically.

3.4 FLOW SWITCH
SAFETY VALVE

A flow switch safety valve (8 fig. 2) interve-

nes, blocking the operation of the burner if
the boiler is without water due to the for­mation of air bubbles in the heat exchanger
or if the circulator is not working correctly
or because the “Aqua Guard” heating cir­cuit filter is clogged.

3.5 SYSTEM
AVAILABLE
HEAD

The head available for the heating plant is
shown as a function of the flow in graph in
fig. 16.
To obtain the maximum head available to
the system, turn of f the by-pass by turning
the union to the vertical position (fig. 16/a).

0

10 0

800

700600500400300200

PORTATA (l/h)

PREVALENZA RESIDUA (mbar)

500

400

10 0

200

300

Format.zip PC

600

By-pass inserito
By-pass escluso

900

1000

110 0

25

30-35

25

30-35

Fig. 16

By-pass inserito

By-pass escluso

Fig. 16/a

BY-PASS ON

BY-PASS OFF

D.H.W. FLOW RATE ADJUSTER
(it does not include SYSTEM 25 HE)

Flow rate (l/sec)

Available head (mbar)

By-pass on
By-pass off

17

3.6 SMOKE PRESSURE
SWITCH

The air pressure switch is factory set to
the values 42-52 Pa (“25 HE” model),
52-62 Pa (“30 HE” model) and 65-75 Pa
(“35 HE” model) to guarantee boiler func­tioning even with intake and flue pipes at
the maximum permitted length.
The value of the signal to the pressure

switch is measured using a special instru­ment connected to the pressure intake
(10-18 fig. 3).

3.7 ELECTRICITY
CONNECTION
FOR ZONE SYSTEMS

When installing a system of this type, use a

separate electrical line to which room ther­mostats with their local valves will be con­nected.
Connect micro switches or relay contacts
on terminals 15-16 of the “TA” connector
of the electronic card after removing the
existing jumper (fig. 17).

CR1

CR

Connettore "TA"

Fig. 17

L

N

TA

TA 1

VZ

R

VZ1

R1

KEY
TA-TA1 Zone r oom stat
VZ-VZ1 Zone valve
R-R1 Zone relay
CR-CR1 Relay contact or micro zone valve

NOTE: Relays are used only if the area
valves have no microswitches.

“TA” connector

18

SIME SUPPORT
THE BENCHMARK INITIATIVE

All relevant sections of the logbook must be
filled in at the time of installation and there­after service information on the back page
of the logbook. Commissioning of the boiler
is not complete until the logbook is filled in.

4.1 FILLING THE WATER SYSTEM

– Open the flow and return valves.
– Loosen the automatic air vent cap.
– Open all radiator valves and system air

vents. Fill the system with water using
one of the approved methods described
in section 2.3.2 to about 0.5 bar
greater than the system design pres­sure. Close all air vents. Do not close

the A.A.V.
– Check the system for water soundness.
–

Completely drain the appliance and heat-

ing system, thoroughly flush the system,

and refill the system design pressure.
–

Before refillimg check and clean the Aqua-

guard filter (4.9).

4.1.1 Flow Rate Adjustment

The DHW flow rate should be set using the
flow rate adjuster (see fig. 16/a) to the
value shown in section 1.3.

4.2 GAS VALVE

The boilers are equipped standard with the
SIT 845 SIMGA/HONEYWELL VK 4105M
/SIEMENS VGU 50 gas valve (fig. 21).
The gas valve is set at two pressure values:
maximum and minimum. According to the
type of gas burnt, these correspond to the
values given in Table 6.
The gas pressures at the maximum and
minimum values, are factory set. Conse­quently they must not be altered. Only when
you switch the appliance from one type of
gas supply (methane) to another (butane or
propane), it is permitted to alter the opera­ting pressure.

4.3 GAS CONVERSION

This operation must be performed by
authorised personnel using original Sime
components.

To convert from natural gas to LPG or vice
versa, perform the following operations (fig.

22):
– Close the gas cock.
– Disassemble the burner manifold (3).
– Replace the main nozzles (6) supplied in

a kit, inser ting the copper washer (4).
Use a ø 7 spanner to perform this ope­ration.

–

Remove the “METANO/GPL” connector
link on the card and set it in the posi-

tion corresponding to the gas to be
used (4 fig. 15).

– To set the values of maximum and mini-

mum gas pressure, follow the instruc­tions given in section 4.5.1.

– After have ultimated the conversion of

the boiler, please stick onto the casing
panel the plate showing the relevant fee­ding gas which is included into the kit.

NOTE: When reassembling components
which you have removed, replace gas
seals; test all gas connections after
assembly using soapy water or a product
made specifically for the purpose, being
sure not to use open flame.

4.5.1

Adjusting valve pressure

Set maximum and minimum pressure on
gas valves as follows (fig. 22/a):
– Connect the column or a manometer to

the intake downstream of the gas valve.

Disconnect the valve VENT pressure test
point tube (5 fig. 21).

– Remove the cap (1) from the modulator.
– Place the hot tap water potentiometer

knob at the maximum position.

– Turn on the boiler using the four-way

switch and turn on a hot water tap all
the way.

– Remember that rotating clockwise will

increase pressure while rotating anti-

4 USE AND MAINTENANCE

3

4

2

1

5

6

1

2

4

3

5

SIT 845 SIGMA HONEYWELL VK 4105M

KEY
1 Modulator
2 EV1-EV2 coils
3 Pressure inlet upstream
4 Pressure inlet downstream
5 VENT pressure test point

TABLE 6

Burner Modulator Burner Modulator

Type of gas max. pressure mbar current min. pressure mbar current

25 HE 30 HE 35 HE mA 25 HE 30 HE 35 HE mA

G20 * 11.5 11.5 13.5 130 2.0 2.6 2.2 0

G30 28.5 28.3 28.2 165 4.8 6.3 4.5 0

G31 36.5 36.2 36.2 165 4.8 6.3 4.5 0

(*) Max. bur ner pressure is guaranteed only when the supply pressure exceeds the max. burner pressure by at

least 3 mbar.

Fig. 21

Fig. 22

KEY

1 Swivel connection 1/2”
2 Locknut 1/2”
3 Burner manifold
4 Washer ø 6.1
5 Burners
6 Nozzle M6
7 Screw

WARNING: To ensure a perfect seal,
always use the washer (4) supplied
in the kit when replacing nozzles,
even in burner units for which it is
not specified.

1

2

3 4 5

SIEMENS VGU 50

19

clockwise will diminish it.

– Adjust maximum pressure using the nut

(3) with a wrench to the maximum pres­sure value indicated in Table 6.

– Do not adjust minimum pressure until

you have adjusted maximum pressure.

– Turn off the supply power to the modula-

tor, and keep the hot water tap turned on.

– Lock the nut (3) in place, turn the screw

/nut (2) to the minimum pressure indi­cated in Table 6.

– Turn off the boiler and turn it back on

again several times, keeping the hot water
tap turned on at all times and checking
that the maximum and minimum pressu­re values correspond to the established
values; correct the settings if necessary.

– Adjust, checking that you have restored

the power to the modulator.

– Put the pipe back on the valve VENT

pressure test point.

– Remove the manometer, remembering

to tighten the screw for closing the pres­sure test point.

– Put the plastic cap (1) back on the modu-

lator and seal with a drop of coloured
sealant if necessary.

4.8 REMOVAL OF OUTER CASING

It is possible to completely disassemble the
shell for an easy maintenance of the boiler
as showed in fig. 21.

4.9 CLEANING AND MAINTENANCE

Preventive maintenance and checking of
efficient operation of equipment and safety
devices must be carried out exclusively by
authorized technical personnel.

4.10 CLEANING THE C.H. WATER FILTER
“AQUA GUARD” (fig. 22)

To clean the filter, close the flow/return val­ves, turn off the power to the control panel,
remove the casing and empty the boiler
using the drain provided until the hydrome­ter shows “zero”. Place a container for col­lection underneath the filter, unscrew the
cap and proceed to clean the filter, remo­ving impurities and limestone deposits.
Check the seal o-ring before reassembling
the cap with the filter.

1

2

Fig. 21

Fig. 22

Fig. 22/a

3

2

1

KEY
1 Plastic tap
2 Minimum pressure adjusting nut
3 Maximum pressure adjusting nut

SIT 845 SIGMA HONEYWELL VK 4105M

SIEMENS VGU 50

20

4.11 CHIMNEY SWEEP FUNCTION

(fig. 23)

To carry out the verification of combustion
in the boiler turn the selector and stop on
the position ( ) until the green/orange led
starts to flash intermittently.
From that moment the boiler will start func­tioning in heating mode at the maximum
power, with switching of f at 80°C and
restarting at 70°C.

Before activating the chimney sweep func­tion make sure that the radiator valves or
eventual zone valves are open.

The test may be carried out also during hot­water service functioning.
To do so it is enough, after having activated
the chimney sweep function, to take some
hot water from one or more cocks.
Even in this condition the boiler functions at
the maximum temperature always with the
primary controlled between 80°C and 70° C.
During the entire duration of the testing the
hot water taps must remain open.
After verifying the combustion the boiler
should be switched off by placing the selec­tor on the OFF position; then return the
selector to the desired function.

ATTENTION: After about 15 minutes, or
once the hot water request has been ful­filled, the chimney sweep function auto­matically deactivates.

4.12 BOILER SERVICING

4.12.1 Routine Servicing

To ensure continued efficient operation of
the appliance, it is recommended that it is
checked and serviced at regular intervals.
The frequency of service will depend on the
particular installation and conditions of
usage, but in general once a year should be
adequate.
It is the law that a competent person such
as a CORGi registered engineer, must carry
out any service work.

4.12.2 Combustion Check

Incorporated into the flue elbow or vertical
adaptor is a sampling point.
The grey plastic cap should be unscrewed
and the flue gas sampled using a flue gas
analyser.
During the test the boiler can be operated
in “chimney sweep mode” see 4.11.
The correct CO2 reading can be found in
section 1.3.

4.12.3 Burner inspection

Remove the burner as described in section

6.3.
Inspect the burner and if necessary clean
using a soft brush.

Check the Ignition/ionisation electrode,
check the gap (4mm+/- 0.5mm)

4.12.4 Combustion Chamber

Remove any loose debris from the combu­stion chamber using a soft brush and a
vacuum cleaner.
Take care not to damage the rear insulation
panel.

4.12.5 Condensate Trap

The condensate trap would not normally
require removal during service, but it can be
checked.
Water should be poured into the inner flue.
Great care must be taken to ensure no
water enters the outer flue.
Check that the water flows freely to the
drain.
Should it require removal, firstly remove
wire clip securing the condensate drain rub­ber pipe to the condensate trap.
Remove the pipe.
Remove the two screws securing the con­densate trap bracket.
Clean the trap and refit in reverse order.

4.12.6 Flow Switch

The operation of the flow switch should be
checked at each service.
Remove small cover retaining screw and
remove the cover.
When the pump is running and water is
flowing around the boiler, the actuator lifts
off the microswitch.
Check the operation of the actuator. Ensure
that it is free and that it lifts and returns.
If necessary lubricate the pivot point of the
actuator.
Isolate the boiler.
Drain it using the drain provided.
Remove the microswitch by carefully pulling
it forward off its mounting pins.
Remove the screw securing the mounting
plate, then pull off the plate.
Pull out the actuator pin.

Lubricate the centre “O” ring.
Refit the actuator ensuring that the flat side
of the round section is to the bottom.
Re-assemble remaining parts. (see 4.12.6
before refilling the boiler).

4.12.7 Aquaguard Filter

It is recommended that the aquaguard filter
is checked at each service.
See section 4.10.

Spia lampeggiante
verde/arancio

2

4

5

3

Fig. 23

Bi-colour green/orange
flashing led

21

If an electrical fault occurs on the appliance
the preliminary electrical system checks
contained in the British Gas Multimeter
Instruction Booklet must be carried out
first. When any service or replacement of
electrical components which has required
the breaking and re-making of electrical
connections has taken place, the following
tests must be repeated:
– ear th continuity;
– shor t circuit;
– polarity;
– resistance to earth.

5.1 EARTH CONTINUITY CHECK

Appliances must be electrically disconnect-

ed, meter set on Ω (ohm) x 1 scale and

adjust zero if necessary. Tests leads from
any appliance earth point (e.g. inside control
box) see wiring diagrams (section 7) to
earth pin on plug. Resistance should be less

than 1 Ω (ohm). If the resistance is greater
than 1 Ω (ohm) check all earth wires for

continuity and all contacts are clean and
tight. If the resistance to earth is still

greater than 1 Ω (ohm) then this should be

investigated futher.

5.2 SHORT CIRCUIT
CHECK

Switches turned FULL ON - meter set on Ω

(ohms) x 1 scale. Test leads from L to N on
appliance terminal block, if meter reads 0
then there is a short circuit.

Meter set on Ω (ohm) x 100 scale. Repeat

it with leads from L to E. If meter reads less

than infinity (∞) there is a fault.

NOTE: Should it be found that the fuse has
failed but no fault is indicated, a detailed
continuity check (i.e. by disconnecting and
checking each component) is required to
trace the faulty component.
It is possible that a fault could occur as a
result of local burning/arcing but no fault
could be found under test. However, a
detailed visual inspection should reveal
evidence of burning around the fault.

5.3 POLARITY CHECK

Appliance reconnected to mains supply and
meter set on 300 V ac scale. Test at appli­ance terminal block.
– Test leads from L to N meter reads

approx.: 240 V ac.

– Test leads from L to E “ ” meter reads

approx. 240 V ac.

–

Test leads from N to E “ ” meter reads
from 0 to 15 V ac.

5.4 RESISTANCE TO
EARTH CHECK

Appliance must be disconnected from main

supply and meter on Ω (ohm) x 100 scale.

All switches including thermostat on test
leads from L to E - if meter reads other than

infinity (∞) there is a fault which should be

isolated.
A detailed continuity check is required to
trace the faulty component.

IMPORTANT:
These series of checks are the first elec­trical checks to be carried out during a
fault finding procedure. On completion
of the service/fault finding task which
has required the breaking and remaking
of electrical connections then the
checks 5.1 Earth continuity, 5.3 Polarity
and 5.4 Resistance to earth must be
repeated.

5 FAULT FINDING

22

5.5 C.H. MODE - FAULT FINDING

Start from cold Rotary switch set to WINTER position.

Room thermostat (if fitted) calling for heat and all D.H.W. taps off.
C.H. thermostat set to maximum position.
Clock in the on position (if fitted).

NOTE:
After completing fault finding reset the room thermostat (if fitted) to the required setting. If the appliance will not function check the wiring
to the clock and if necessary, replace the clock.

Is there power

at the external

socket?

Make

power

available

Does

the pump

start?

Does

the fan

start?

Turn the clock

in the right

position

Is fuse

at mains

plug OK?

Is the clock in

the correct
band time?

Is there voltage

available

to the fan?

Replace

the clock

Replace fuse in

mains plug

Check the

time clock does

his contacts
open and close
when the clock

turns?

Replace

the fan

Make it free to

rotate

Put a jumper

on the room

thermostat
connection

Check the

power supply

cable

Is pump shaft

free to rot ate?

Is there voltage

available

to the pump?

Replace

the pump

Check pump

connection

Does the boiler
lock-out without

starting the

burner?

The boiler

lock-out
starting

the burner

Is there a spark

at the ignition

electrode?

Is the ionization
probe connected
to the main PCB
and the ground?

Check the
gas supply

Check for continu-

ity between ignition

electrode and igni-

tion transformer

The gap between
ignition electrode

and hood

is correct?

Fit correctly the

ignition electrode

Is the gas
available?

Check the

connection of

the gas valve on

the control board

PCB

Is there voltage at

the gas valve?

Replace the

gas valve

Yes

No

Is there a jumper

on the room

thermostat

connection?

No

Yes

No

Yes

No

Yes

Yes

Yes

Yes

No

Yes

No

Yes

Yes

Yes

No

No

Yes

YesYes

No

No

Yes

No

No

No

No

Yes

No

Verify that the

safety and fume

thermostats are

working correctly?

Replace the

thermostats

No

Is the
connection of
the fume and

safety

thermostats

correct?

Reset the

connection

No

Yes

Restor e the

connection

Verify that the
safety and fume
thermostats are

working correctly?

No

Yes

Yes

Check the

connection of

the thermostats

Replace the
thermostats

No

Yes

23

5.6 D.H.W. MODE - FAULT FINDING

Start from cold - rotary switch set to SUMMER position, D.H.W. thermostat set to maximum, and all D.H.W. taps OFF.

Is there power
at the external

socket?

Make

power

available

Open any tap.

Is there an

adequate flow

rate of D.H.W.

available?

Does the

microswitch of the

divertor valve

operate correctly?

Does
the fan
start?

Is fuses
at mains
plug OK?

Clean or replace

the divertor val ve

Is there voltage

available

to the fan?

Replace fuses in

mains plug

Does

the pump

start?

Replace

the fan

Make it free to

rotate

Replace the

microinterruptor

Check the

power supply

cable

Is pump shaft

free to rot ate?

Check pump

connection

Replace

the pump

Does the boiler
lock-out without

starting the

burner?

The boiler

lock-out

starting

the burner

Is there a spark

at the ignition

electrode?

Is the ionization

probe connected

to the main PCB
and the ground?

Check the

gas supply

Check for continu-

ity between ignition

electrode and igni-

tion transformer

The gap between
ignition electrode

and hood

is correct?

Fit correctly the

ignition electrode

Is the gas
available?

Restor e the

connection

Check the

connection of

gas valve on

the control board

PCB

Is there voltage at

the gas valve?

Replace the

gas valve

Yes

No

No

Yes

No

No

Yes

No

Yes

Yes

Yes

Yes

Yes

No

Yes

No

No

Yes

Yes

No

Yes

No

No

No

Is there voltage

available

to the pump?

No

Yes

Yes

No

Yes

Yes

Verify that the
safety and fume
thermostats are

working correctly?

Replace the

thermostats

No

Is the
connection of
the fume and

safety

thermostats

correct?

Reset the

connection

No

Yes

Yes

No

Verify that the

safety and fume

thermostats are

working correctly?

Yes

Check the

connection of

the thermostats

Replace the

thermostats

No

24

Note: Use silicone grease to ease the fit­ting of any push fit connections.

6.1 Expansion Vessel

– Isolate power supply
– Remove boiler cover
– Isolate flow and return valves
– Drain boiler using fitted drain vent
– Disconnect expansion pipe
– Remove expansion vessel securing nut
– Remove vessel
– Check new vessel for correct pressure

1- 1.25 bar

– Refit in reverse order

6.2 Ignition/Ionisation electrode

– Isolate power supply
– Remove boiler cover
– Remove sealed chamber cover
– Remove PCB cover
– Disconnect ignition lead
– Carefully remove lead through PCB

cover and burner compar tment

– Remove electrode fixing screw and

remove electrode from burner

– Replace in reverse order

6.3 Main Burner

– Isolate power supply
– Isolate gas supply
– Remove boiler cover
– Remove sealed chamber cover
– Remove burner cover
– Disconnect gas connection to burner
– Remove locknut securing burner assem-

bly
– Remove ignition/ionisation electrode
– Carefully lift out burner assembly
– Refit in reverse order
– Test for gas soundness

6.4 Fan assembly

– Isolate power supply
– Remove boiler cover
– Remove sealed chamber cover
– Disconnect wiring to fan
– Remove two fan fixing screws
– Carefully pull fan forward and to the

right to disconnect fan from post con-

denser
– Remove air pressure switch sensing

tube
– Apply light coating of silicone grease to

nozzle of new fan
– Refit in reverse order

6.5 Main Heat Exchanger

– Isolate power supply
– Isolate gas supply
– Isolate flow and return valves

– Drain boiler using drain vent
– Remove fan assembly as described in

6.4

– Remove 4 screws and remove fan

mount ing plate
– Disconnect thermistor (SM sensor)
– Disconnect flow and return connections
– Lif t out heat exchanger
– Refit in reverse order

6.6 95°C Limit stat

– Isolate power supply
– Remove boiler cover
– Remove sealed chamber cover
– Remove fan as described in 6.4
– Remove wires from 95°C stat
– Remove stat fixing screws
– Apply heat sink compound to new stat
– Refit in reverse order

6.7 Air Pressure Switch

– Isolate power supply
– Remove boiler cover
– Remove sealed chamber cover
– Remove screws securing air pressure

switch
– Note position of wires before removal
– Note position of sensing tube before

removal
– Refit in reverse order

6.8 100°C Safety Stat

– Isolate power supply
– Remove boiler cover
– Disconnect 100°C safety stat
– Remove fixing screws
– Refit in reverse order

6.9 Thermistor (SM sensor)

– Isolate power supply
– Remove boiler cover
– Remove sealed chamber cover
– Isolate flow and return valves
– Drain boiler using drain vent
– Disconnect thermistor
– Unscrew thermistor (catch any water

lost)
– Refit in reverse

6.10 Gas Valve

– Isolate power supply
– Isolate gas supply
– Remove boiler cover
– Disconnect wiring from gas valve
– Disconnect sensing tube
– Remove gas valve
– Refit in reverse order ensuring seals are

replaced as required
– Recommission boiler and adjust gas

pressures as described in section 4.5.1

– Check for gas soundness

6.11 Circuit Board (PCB)

– Isolate power supply
– Remove screws securing control panel
– Lower panel to horizontal position
– Remove PCB cover
– Disconnect all wiring
– Remove control knobs
– Remove PCB fixing screws
– Transfer trimmer spindles to new board
– Ensure PCB links are matched to old

board
– Refit in reverse order
– Recommission boiler

6.12 Pump Motor

– Isolate power supply
– Remove boiler cover
– Isolate flow and return valves
– Drain boiler using drain vent
– Remove plug connection
– Remove 4 x fixing screws, catch any lost

water
– Refit in reverse using new washers

6.13 Diverter Valve Microswitch

– Isolate power supply
– Remove boiler cover
– Pull microswitch assembly forward off

the diverter valve head
– Refit in reverse order

6.14 Domestic Hot Water

Heat exchanger

– Isolate power supply
– Isolate flow and return
– Turn on DHW tap
– Close cold water supply isolation valve
– Drain boiler using drain vent
– Remove diverter valve microswitch as

described in 6.13
– Remove microswitch actuator from top

of diverter valve
– Remove 3 x heat exchanger fixing

screws
– Remove plate heat exchanger, catch any

water lost
– Ensure that the four “O” rings are remo-

ved from the technil assembly
– Fit the new “O” ring supplied with the

new heat exchanger to the heat exchan-

ger
– Refit in reverse order

6.15 Diverter Valve

– Remove Diverter valve microswitch as

described in 6.13
– Remove plate heat exchanger as descri-

bed in 6.14

6 REPLACEMENT OF PARTS

25

– Remove the securing clip at retaining

the plug at the LHS of diverter assembly
NOTE: a internal spring will push of f the

plug. Retain
– Remove internal bush from spindle
– Remove diverter valve head securing

clip
– Pull diverter valve head from assembly
– Remove spindle from assembly comple-

te with bush and spacer
– Replace in reverse order replacing “O”

rings as required

6.16 Auto Air Vent (AAV)

– Isolate power supply
– Isolate flow and return valves
– Remove boiler cover
– Drain boiler using drain vent

– Remove AAV
– Replace in reverse order

6.17 Safety Valve

– Isolate power supply
– Isolate flow and return valves
– Remove boiler cover
– Drain boiler using drain vent
– Disconnect pipe from safety valve
– Remove safety valve securing clip
– Remove safety valve, catch any water

lost

– Refit in reverse

6.18 Pressure / Temperature Gauge

– Isolate power supply

– Isolate flow and return valves
– Remove boiler cover
– Drain boiler using drain vent
– Remove the clip securing the pressure

sensor

– Remove the clip securing thermometer

bulb
– Carefully remove the gauge
– Refit in reverse order

26

7 EXPLODED VIEWS

7.1 ECOMFORT SYSTEM 25 HE

COD. T YPE DATE PAGE

3830017/388 ECOMFORT SYSTEM 25 HE 17.09.2007 1/3

27

Fonderie Sime S.p.A. - Via Garbo, 27 - 37045 Legnago (Verona) - Tel. [phone] - Fax [phone] - www.sime.it

POSITION CODE DESCRIPTION MODEL NOTE

COD. TYPE DATE PAGE

• Recommended stock par ts - Componenti da tener e a scorta

POSITION CODE DESCRIPTION MODEL NOTE

1 6138570 Side frame part

2 6138771 Frame assembly upper support

3 6255431 Expansion vessel lower support

4 • 5139130 Expansion vessel l.8 - 3/8” M

5 6146305 Brass Nut 3/8”

6 6288120 Sealed chamber rear panel

7 6034153 Condensate drainage pipe

8 6257521 Combustion chamber lower air deflector

9 6010827 Post-condenser fixing bracket

10 6300800 Post-condenser

11 6248855 P.C. inlet/oulet smokes gasket

12 6112320 P.C. smokes stat extension

13 6226443 O-Ring Ø 11,5 x 1,5

14 6146722 95°C safety stat

15 6257522 Air deflector

16 6288430 Combustion chamber rear panel

17 5190700 Main burner assembly

18 • 6235931 Ignition-ionisation electrode

19 6146301 Brass nut 1/2”

20 6288510 Combust. chamber right hand side panel

21 6288610 Combust. chamber left hand side panel

22 6139773 Combustion chamber rear insulation

23 6139792 Combustion chamber side insulation

24 6257519 Comb. chamber right/left air deflector

25 6028707 Air intake gasket

26 6288000 Air intake

27 6174243 Heat exchanger

28 • 6231351 Plunged sensor

29 • 6022010 Sensor gasket

30 6260616 Smoke chamber upper panel

31 6225630 Fan

32 6288720 Combustion chamber front panel

33 6139786 Combustion chamber front insulation

34 6264831 C.H. return pipe

35 • 6226412 O-ring 3068

36 6226616 Pipe fixing spring

37 6227210 Exchanger-post condenser inlet pipe

38 • 6226601 Spring for heat exchanger connection

39 2005201 Screw “HI-LO” TSP 3x12

40 6264731 C.H. flow pipe

41 6247360 Cap for time programmer

42 2030228 Gasket Ø 17x24x2

43 • 6146701 100°C safety stat

44 • 6277204 Water trap

45 6189574 Water trap fixing bracket

46 6226612 Pipe fixing double spring

47 • 6017310 Flexible pipe

48 6226414 O-ring 117 Ø 13,1x2,62 EP851

49 2030226 Gasket Ø 10,2x14,8x2

50 6138880 Frame assembly lower side

51 6146302 Brass nut 3/4”

52 6226607 Pipe fixing spring

53 6028705 Gasket EP709 for Dab

54 2000201 Screw M5x40

55 • 6040201 Pressure relief valve

56 6100202 Ogive for pipe Ø 15

57 6168401 Locking nut for pipe Ø 15

58 • 6226602 Pipe fixing spring

59 6288200 Sealed chamber side panel

60 • 6225724 Air pressure switch 52-62 Pa

61 6280500 3-ways junct. with press. test nipple

62 6280550 Cap for 3-ways junction

63 6146303 Brass Nut 1/8”

64 6243820 SIT gas valve type 845 SIGMA

65 6226850 Gas inlet pipe

66 6226945 Pipe connecting gas valve-main burner

67 2030227 Gasket Ø 12x18x2

68 6289818 Control panel

69 6273210 Guidelight - 2 ways out

70 • 6217003 Temperature and pressure gauge

71 6301400 Main PCB

72 6201505 Trimmer spindle Ø 6

73 6201502 Trimmer spindle Ø 6

74 2211610 Earth faston

75 • 6269810 Ignition cable

76 6289900 Control panel protecting cover

3830017/388 ECOMFORT SYSTEM 25 HE 17.09.2007 2/3

28

Fonderie Sime S.p.A. - Via Garbo, 27 - 37045 Legnago (Verona) - Tel. [phone] - Fax [phone] - www.sime.it

POSITION CODE DESCRIPTION MODEL NOTE

COD. TYPE DATE PAGE

• Recommended stock par ts - Componenti da tenere a scor ta

POSITION CODE DESCRIPTION MODEL NOTE

77 6290300 Control panel cable cover

78 6290200 Room stat connection cover

79 6290100 White knob Ø 40

80 6009585 Control panel bracket

81 • 6131401 Microswitch for flowmeter

82 6009557 Relay fixing bracket

83 6247326 Cap for knob hole

84 6290014 Flap door

85 6226605 Fixing spring

86 2051100 Retaining spring

87 6288310 Sealed chamber front panel

88 6001210 Peephole

89 6287331 Casing

90 2013302 Fastener for self tapping screw

91 2004510 Screw 8Px7/8”

92 6112420 Control panel screw

93 • 6028624 Air diaphragm Ø 87.5

94 6154402 Main burner nozzle NP 130 natural gas

94 A 6154410 Main burner nozzle NP 77 GLP

95 6177505 Ball cock 3/4” x 22

96 6022004 Copper washer Ø 6

97 6177530 Gas cock 3/4” F x 15

98 6157602 Pressure relief valve drain pipe

99 • 5192600 Dab VA55 pump kit

100 6281521 Flange + OR for Dab pump

101 5192200 Gasket for sealed chamber

102 6263912 Fan pressure test point

103 • 6149303 Flow water switch

104 6227520 Pipe connecting water flow switch

105 • 6190403 Relay Omron G2R-1-T

106 2211004 Terminal strip

107 6290350 Terminal strip protection cover

108 • 6017210 Manual air vent 1/4”

109 • 6013101 Automatic air vent

110 6296916 By-pass

111 6281500 Straight fitting 3/4”

5184818 Fitting cocks kit

5187370 Technyl hydraulic group

5191185 Complete control panel

6031206 Main cable L=2000

6299924 6 pole Stocko connector CN7

6299987 14 pole Lumberg cable connecto

6299988 4 pole Lumberg cable connector

5144719 L.P.G. conversion kit

Products reference:

8104010: Ecomrof t system 25 HE

Check the correspondence with the boiler data plate.

3830017/388 ECOMFORT SYSTEM 25 HE 17.09.2007 3/3

29

7.2 ECOMFORT 25-30-35 HE

COD. T YPE DATE PAGE

3830008/394 ECOMFORT 25-30-35 HE 10.09.2007 1/3

30

Fonderie Sime S.p.A. - Via Garbo, 27 - 37045 Legnago (Verona) - Tel. [phone] - Fax [phone] - www.sime.it

POSITION CODE DESCRIPTION MODEL NOTE

COD. TYPE DATE PAGE

• Recommended stock par ts - Componenti da tener e a scorta

POSITION CODE DESCRIPTION MODEL NOTE

1 6138570 Side frame part

2 6138771 Frame assembly upper support

3 6255431 Expansion vessel lower support

4 • 5139130 Expansion vessel l.8 - 3/8” M

5 6146305 Brass Nut 3/8”

6 6288120 Sealed chamber rear panel

7 6034153 Condensate drainage pipe

8 6257521 Combustion chamber lower air deflector

9 6010827 Post-condenser fixing bracket

10 6300800 Post-condenser

11 6248855 P.C. inlet/oulet smokes gasket

12 6112320 P.C. smokes stat extension

13 6226443 O-Ring Ø 11,5 x 1,5

14 6146722 95°C safety stat 25-30

14 A 6146701 100°C safety stat 35

15 6257522 Air deflector

16 6288430 Combustion chamber rear panel

17 5190752 Main burner assembly 30

17 A 5190700 Main burner assembly 25

17 B 5190760 Main burner assembly 35

18 • 6235931 Ignition-ionisation electrode

19 6146301 Brass nut 1/2”

20 6288510 Combust. chamber right hand side panel 25-30

20 A 6288511 Combust. chamber right hand side panel 35

21 6288610 Combust. chamber left hand side panel 25-30

21 A 6288611 Combust. chamber lef t hand side panel 35

22 6139773 Combustion chamber rear insulation

23 6139792 Combustion chamber side insulation

24 6257519 Comb. chamber right/left air deflector

25 6028707 Air intake gasket

26 6288000 Air intake

27 6174243 Heat exchanger

28 • 6231351 Plunged sensor

29 • 6022010 Sensor gasket

30 6260616 Smoke chamber upper panel

31 6225630 Fan

32 6288720 Combustion chamber front panel

33 6139786 Combustion chamber front insulation

34 6264831 C.H. return pipe

35 • 6226412 O-ring 3068

36 6226616 Pipe fixing spring

37 6227210 Exchanger-post condenser inlet pipe

38 • 6226601 Spring for heat exchanger connection

39 6264746 Pipe conn. C.H. filter-C.H. exchanger

40 6264748 C.H. flow pipe

41 • 6295500 C.H. filter 3/4”M x 3/4”M

42 2030228 Gasket Ø 17x24x2

43 • 6146701 100°C safety stat

44 • 6277204 Water trap

45 6189574 Water trap fixing bracket

46 6226612 Pipe fixing double spring

47 • 6017310 Flexible pipe

48 6226414 O-ring 117 Ø 13,1x2,62 EP851

49 2030226 Gasket Ø 10,2x14,8x2

50 6138880 Frame assembly lower side

51 6146302 Brass nut 3/4”

52 6226607 Pipe fixing spring

53 6028705 Gasket EP709 for Dab

54 2000201 Screw M5x40

55 • 6040201 Pressure relief valve

56 6100202 Ogive for pipe Ø 15

57 6168401 Locking nut for pipe Ø 15

58 • 6226602 Pipe fixing spring

59 6288200 Sealed chamber side panel

60 • 6225715 Air pressure switch 30

60 A • 6225724 Air pressure switch 52-62 Pa 25

60 B • 6225713 Air pressure switch 35

61 6280500 3-ways junct. with press. test nipple

62 6280550 Cap for 3-ways junction

63 6146303 Brass Nut 1/8”

64 6243820 SIT gas valve type 845 SIGMA

65 6226850 Gas inlet pipe

66 6226945 Pipe connecting gas valve-main burner

67 2030227 Gasket Ø 12x18x2

68 6289817 Control panel

69 6273210 Guidelight - 2 ways out

3830008/394 ECOMFORT 25-30-35 HE 10.09.2007 2/3

31

Fonderie Sime S.p.A. - Via Garbo, 27 - 37045 Legnago (Verona) - Tel. [phone] - Fax [phone] - www.sime.it

POSITION CODE DESCRIPTION MODEL NOTE

COD. TYPE DATE PAGE

• Recommended stock par ts - Componenti da tener e a scorta

POSITION CODE DESCRIPTION MODEL NOTE

70 • 6217005 Temperature and pressure gauge

71 6301400 Main PCB

72 6201505 Trimmer spindle Ø 6

73 6201502 Trimmer spindle Ø 6

74 2211610 Ear th faston

75 • 6269810 Ignition cable

76 6289900 Control panel protecting cover

77 6290300 Control panel cable cover

78 6290200 Room stat connection cover

79 6290100 White knob Ø 40

80 6009585 Control panel bracket

81 • 6131401 Microswitch for flowmeter

82 5191900 Divertor valve microswitch + support

84 6290014 Flap door

85 6226605 Fixing spring

86 2051100 Retaining spring

87 6288310 Sealed chamber front panel

88 6001210 Peephole

89 6287331 Casing

90 2013302 Fastener for self tapping screw

91 2004510 Screw 8Px7/8”

92 6112420 Control panel screw

93 • 6028624 Air diaphragm Ø 87.5 25-30

94 6142330 Quarter bend 1/2” x 15

95 6177505 Ball cock 3/4” x 22

96 6177506 Ball cock 1/2” x 15

97 6177530 Gas cock 3/4” F x 15

98 6157602 Pressure relief valve drain pipe

99 • 5192601 Dab VA65 circulating pump kit 30-35

99 A • 5192600 Dab VA55 pump kit 25

100 6281521 Flange + OR for Dab pump

101 5192200 Gasket for sealed chamber

102 6263912 Fan pressure test point

103 6226429 O-ring 121

104 • 6013101 Automatic air vent

105 • 6281522 14 plate heat exchanger kit 25-30

105 A • 6281525 16 plate heat exchanger kit 35

106 • 6226421 O-ring Dalmar R12

107 6281500 Straight fitting 3/4”

108 6281501 Straight fitting 1/2”

109 • 6017210 Manual air vent 1/4”

110 • 6281502 Flow water switch spare parts

111 • 6281504 Divertor valve

112 6281512 Water rate adjuster

113 6022004 Copper washer Ø 6

114 6154402 Main burner nozzle NP 130 natural gas

114 A 6154410 Main burner nozzle NP 77 GLP 25-30

114 B 6154406 Main burner nozzle NP 0,80 35

115 6247360 Cap for time programmer

116 2005201 Screw “HI-LO” TSP 3x12

5187323 Technyl hydraulic group 25-30

5191180 Complete control panel

6127210 Main cable L=2000

6299923 14 pole Lumberg cable connector CN6

6299924 6 pole Stocko connector CN7

6299925 4 pole Lumberg cable connector for time clock 25-30

6299988 4 pole Lumberg cable connector

• 6233506 Fuse T1,6A 250V

6281523 C.H. Technyl manifold

6281524 D.H.W. Technyl manifold

8085606 90° elbow with take-off points 25-30

8102110 Gasket and flange kit 25-30

6289580 Cable + electrode P.C. resistance

5184817 Fitting cocks kit

• 5144716 Conversion kit to LPG 35

5187325 Technyl hydraulic group 35

5144719 Conversion kit to LPG 25-30

Products reference:

8104002: Ecomfort 30 HE

8104003: Ecomfort 25 HE

8104005: Ecomfort 35 HE

Check the correspondence with the boiler data plate.

3830008/394 ECOMFORT 25-30-35 HE 10.09.2007 3/3

Cod. 6272272C - 09/07 - Documentation Dpt.

Sime Ltd

Unit D2 Ent erprise Way, Bradford Road, Bradford, West Yorkshire, BD10 8EW

Tel. [phone] - Fax [phone]

www.sime.ltd.uk - e-mail: [e-mail]

Ecomfort 30 HE

User instructions

GB

PLEASE LEAVE THIS INSTRUCTION

WITH THE USER

1

OPERATING INSTRUCTIONS FOR THE USER

1.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.2 APPLIANCE OPERATION

1.3 OPERATING INSTRUCTIONS

1.4 MINIMUM CLEARANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.5 ROUTINE SERVICING

1.6 GENERAL INFORMATION

1.7 SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.8 TIMER PROGRAMMER

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

CONTENTS

VERY IMPORTANT!

PLEASE MAKE SURE YOUR LOG BOOK ENCLOSED IS FILLED IN CORRECTLY.

ALL CORGI REGISTERED INSTALLERS CARRY A CORGI ID CARD.

BOTH SHOULD BE RECORDED IN YOUR CENTRAL HEATING LOG BOOK.

YOU CAN CHECK YOUR INSTALLER IS CORGI REGISTERED

BY CALLING ON 01256 372300

2

OPERATING INSTRUCTIONS FOR THE USER

Fig. 1

KEY
A Temperature/pressure gauge
B Time programmer
C Selector switch summer/winter
D D.H.W. thermostat
E C.H. thermostat

THE GAS SAFETY (INSTALLATION AND USE) REGULATIONS

1996. It is the law that all gas appliances are installed by a
registered person, in accordance with the above regulations.
Failure to install appliances correctly could lead to prosecu­tion. It is in your own interest, and that of safety, to ensure
that the law is complied with.

It is essential that the appliance is correctly earthed. An
electricity supply of 240 V - 50 Hz fused at 3 A is required.

Read these instructions carefully before attempting to oper­ate the appliance.

1.1 INTRODUCTION

The Sime “ECOMFORT 30 HE” is a fully automatic, wall
mounted, room sealed, fan assisted combination boiler. When
operating in winter mode, the appliance provides central heat­ing as required and produces instantaneous hot water upon
demand.
When operating in summer mode, the central heating is not
operational however the appliance continues to supply hot
water whenever it is required. The heat output is automati­cally controlled by the fully modulating gas valve (within its pre­set limits), and there are user adjustable potentiometers to
control the temperature of both central heating and domes­tic hot water. A temperature/pressure gauge is fitted and an
overheat thermostat is incorporated to protect against fault
conditions.

1.2 APPLIANCE OPERATION

A demand of hot water will be sensed by the appliance
detecting water flow (providing that the flow rate is above 2
l/m - 0.5 gal/min).
The fan will start and the burner will light at full output. If

the draw off rate is near the maximum design flow rate
the appliance will run continuously at full output until a tap
is either turned off or the flow rate is reduced in which
case the heat output will reduce accordingly to maintain a
steady temperature.
Hot water is made available almost immediately at the appli­ance outlet, but the final temperature and time taken for the
hot water to reach a tap depends upon the potentiometer
setting, the rate at which water is drawn off, and the length
of the pipe between the boiler and the tap.
When the tap is turned off, the appliance will revert to C.H.
mode (if set on winter position) otherwise the burner will be
extinguished pending the next demand for hot water.

1.3 OPERATING INSTRUCTIONS

1.3.1 To light the appliance (see fig. 1)

– Check that the electricity supply is off and that the D.H.W.

isolation valve is in the open position (lever ver tical). Check
that the gas supply is on.

– Turn the selector switch summer/winter (C) to SUMMER

(water only) position “ ”.

– Switch on the electricity supply and full open any D.H.W.

tap. The burner will light.
If the burner fails to light, turn the selector switch sum­mer/winter to “ “ position and release it immediately;
then turn it to the SUMMER position: the burner should
now light. Turn off the tap.

– Check that the room thermostat and time clock are call-

ing for heat. Turn the heating potentiometer (E) to maxi­mum (fully clockwise).

– Turn the selector switch summer/winter to the WINTER

position “❄" and the burner will light to serve the heating load.

Set the required temperature for the C.H. and D.H.W. by

A EC

F

B D

DHW

ISOLATION VALVE

3

rotating the potentiometers (D - E) clockwise to increase
or anticlockwise to decrease the temperature.

NOTE: when operating in winter mode, priority is auto­matically given to providing hot water when the demand
arises.

1.3.2 To turn off the appliance (see fig. 1)

– For short periods:

Set the selector switch (C) to the OFF position and urn off
the DHW Isolation valve. When required, restore turn the
selector switch to either the SUMMER or WINTER posi­tion and turn on the DHW Isolation valve.

– For longer periods:

Set the selector switch (C) to the OFF position, turn off
the DHW Isolation valve, turn off the gas isolation cock.
When required, manually rotate the pump, open the gas
isolation cock, turn on the DHW Isolation valve and turn
the selector switch to either the SUMMER or WINTER
position.

NOTE: If frost protection is required-turn the selector
switch to the summer position, do no

t isolate the gas

supply, turn off the DHW Isolation valve.

1.4 MINIMUM CLEARANCES

The following MINIMUM CLEARANCES must be available for

servicing the appliance:

1.5 ROUTINE SERVICING

To ensure continued efficient operation of the appliance, it is
recommended that it is checked and serviced as necessary at
regular intervals. The frequency of servicing will depend upon
the particular installation conditions and usage but in general
once a year should be adequate. It is the law that any service
work must be carried out by a registerd person (C.O.R.G.I.).

1.6 GENERAL INFORMATION

1.6.1 Fault finding indicators (LEDS)

The appliance is fitted with a safety cut-out thermostat. In
the event of overheating this will interrupt the power supply
and prevent the appliance from functioning. If this occurs,
allow the appliance to cool, turn the selector switch sum­mer/winter to “ “ position, then turn it back to the previous
position (see fig. 2). If the cut-out condition is repeated, turn
off the electrical supply and consult your installer or service
engineer.

For ventilation For servicing

ABOVE THE APPLIANCE CASING 400 mm 300 mm

AT THE R.H.S. 15 m m 15 m m

AT THE L.H.S. 15 m m 15 m m

BELOW THE APPLIANCE CASING 200 mm 200 mm

IN FRONT OF THE APPLIANCE 100 mm 500 mm

Fig. 2

Bi-colour green led off if power is cut-off.

Bi-colour orange led: C.H. sensor (SM) fault.

Green led flashing: fan/smoke pressure switch.

F

lashing orange led no water circulation.

Flashing red led indicates a problem in the line post-condenser.

Red led on, ignition blocked/safety stat/smoke stat tripped:

turn the rotar y switch in the position ( )

to restore functioning

4

1.6.2 Temperature/pressure gauge

The gauge (A fig. 1) on the facia panel indicates the approxi­mate system pressure. The normal operating pressure is
between 1 and 1.5 bar. If the normal running pressure is
seen to decrease over a period of time there is a water leak
and you should consult your installer or service engineer.

1.6.3 Electrical supply

The mains plug used must be a 3 pin type to BS1363, and
fused at 3 A. THIS APPLIANCE MUST BE EARTHED.

NOTE:
an interruption in the electricity supply whilst the burner
is alight may cause the overheat thermostat to operate. If
this is suspected, turn the rotary switch to “ “ position,
then turn it back to the previous position.

TO CONNECT A PLUG

As the colour of wires in the mains lead of this appliance may
not correspond with the coloured markings identifying the
terminals in your plug, proceed as follows:
the wire which is coloured green and yellow must be con­nected to the terminal in the plug which is marked with the
letter E or by the earth symbol - or coloured green and yel­low; the wire which is coloured blue must be connected to
the terminal marked with the letter N or coloured black; the
wire which is coloured brown must be connected to the ter­minal marked with the letter L or coloured red.

1.6.4 Ventilation

If the appliance is installed in a cabinet, the latter MUST NOT
be used for storage purposes. Any ventilation provided for
the appliance during installation MUST NOT be blocked and a
periodic check must be made to ensure that the vents are
free from obstructions.

1.6.5 Cleaning

Use only a damp cloth and mild detergent to clean the appli­ance outer casing. DO NOT use abrasive cleaners.

1.7 SAFETY

It is essential that the instructions in this booklet are strict­ly followed for the safe and economical operation of this
appliance. The appliance functions as a fan assisted bal­anced flue unit.

The flue terminal MUST NOT BE OBSTRUCT­ED under any circumstances. If damaged, turn off the appli­ance and consult the installer, service engineer, or gas suppli-

er. If it is known or suspected that a fault exists on the appli­ance it MUST NOT be used until the fault has been rectified
by a competent person.

WARNING: IF A GAS LEAK IS SUSPECTED OR EXISTS,
TURN OFF THE GAS SUPPLY TO THE APPLIANCE AT THE
GAS SERVICE COCK. DO NOT OPERATE ANY ELECTRICAL
SWITCHES. DO NOT OPERATE ANY ELECTRICAL APPLI­ANCE. OPEN ALL WINDOWS AND DOORS. DO NOT
SMOKE. EXTINGUISH ALL NAKED LIGHTS. CONTACT THE
GAS SUPPLIER IMMEDIATELY.

1.7 TIMER PROGRAMMER (Fig. 3)

Setting the time

The time of day can be set by grasping the outer edge of the
black dial and turning it in a clockwise direction until the cor­rect time is in line with the white pointer.

Setting the “switching time”

The “ON” periods are set by sliding the blue tappets, adjacent
to the time periods required, to the outer edge of the dial.
The tappets that remain at the centre of the dial will be the
“OFF” periods.

N.B.: The smallest switching time (ON or OFF) is 15 minutes.

– To select “Timed” mode move the selector switch in the

middle of the clock face to the “”position

– To select “Constant” mode move the selector switch in the

middle of the clock face to the “I” position.

– To select “OFF” mode move the selector switch in the mid-

dle of the clock face to the “O” position.

MECHANICAL 24 hr VERSION

Slide blue tappets

OUT for ON period

Slide blue tappets IN for OFF period

Mode selector switch

Fig. 3

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.

Cod. 6272273 - 03/06 - Documentation Dpt.

Sime Ltd

Unit D2 Enterprise Way, Bradford Road, Bradford, West Yorkshire, BD10 8EW

Tel. [phone] - Fax [phone]

www.sime.ltd.uk - e-mail: [e-mail]