REMEHA Gas 350 L Manual

Remeha Gas 350
• Atmospheric gas boiler with
reduced NOx emission
64 174 kW
Technical information
Remeha Gas 350

Remeha Gas 350
2
CONTENTS
Preface 3
1. Boiler description 3
2. Constructions 3
2.1 General 3
2.2 Burners 3
2.3 Boiler floor 3
2.4 Delivery 3
3. Technical information and dimensions 4
4. Application 5
4.1 L.P.H.W. system 5
4.1.1 Water temperature 5
4.1.2 Water pressure 5
4.1.3 Water flow 5
4.1.4 Water treatment 5
4.1.5 Noise level 5
4.2 himneys 5
5. Typical boiler installations 6
6. Regulation and safety equipement 7
6.1 General 7
6.2 Instrument panel 7
6.3 Standard electronic gas train High/Low 7
6.3.1 Schematic 7
6.3.2 Specification 7
6.3.3 ontrol panel behind front panel 7
6.4 Functions 7
6.4.1 Flame protection 7
6.4.2 Down draught thermostat 7
6.4.3 Thermostats 7
7. Assembly and installation guidelines 8
7.1 General 8
7.2 Boiler assembly 8
7.3 Water connections 8
7.4 Pocket for instrument panel 8
7.5 Water pressure 8
8. Gas supply 8
8.1 General 8
8.2 Gas pressure 8
9. Electrical supply 8
9.1 General 8
9.2 ontrol panel 8
9.3 Electrical connections 8
9.4 Electrical data 8
9.5 Wiring diagram boiler 9
10. Commissioning 10
10.1 Technical information 10
10.2 ommissioning the boiler 10
10.3 Switching off the boiler 10
11. Maintenance 11
11.1 General 11
11.2 Maintaining the boiler 11

3
PREFACE
These technical instructions contain useful and important
information for the proper operation and maintenance
of the Remeha central heating boiler, model Gas 350.
Further it contains important directions to prevent accidents
and serious damage before putting it into service and
during operation of the boiler, to allow as far as possible a
safe and trouble free operation. Read these instructions
carefully before putting the boiler into operation, familiarize
yourself with its operation and control and strictly observe
the directions given.
If you have any questions, or if you want more information
about specifi c items relating to this boiler, please do not
hesitate to contact us.
The data published in these technical instructions is based
on the most recent information and is given subject to
later revisions.
We reserve the right to modify the construction and/or
design of our products at any moment, without obligation
to update earlier supplies accordingly.
1. BOILER DESCRIPTION
The Remeha Gas 350 boiler is a cast iron sectional boiler
with atmospheric burners.
Suitable for all qualities of natural gas and LPG,
cat. II 2H3B/P
The Remeha Gas 350 central heating boiler is approved
according to the following European directives:
- Gas appliance directive no. 90/396/EE
- Effi ciency directive no. 92/42/EE
- E.M. . directive no. 89/336/EE
and complies with the following directives:
- Low voltage directive no. 73/23/EE
- Machine directive no. 89/392/EE .
lassifi cation type for evacuation of the combustion pro-
ducts: B11 BS.
For further advice or information contact Broag Ltd.
The Remeha Gas 350 is supplied with electronic junction
with insulated casings.
Water connections 2" male thread.
2. CONSTRUCTIONS
2.2 Burners
The burners are stainless steel, atmospheric burners
with cooling rods to reduce the fl ame temperature.
They guarantee a low noise level and a reduced NOx-
emission.
2.3 Boiler fl oor
The Remeha Gas 350 boiler is supplied as standard
with refl ecting fl oor plates with ventilation underneath.
2.4 Delivery
Up to 109 kW the boiler can be delivered pre-assembled.
The total range can be delivered in parts for site assembly.
2.1 General
- Boiler block of cast iron sections nippled together with
conical nipples.
- Gas and water connections are at the rear of the
boiler.
- Instrument panel is fi tted in the front casing.
- leaning of the cast iron block from top of the boiler.
- The control and safety equipment is fi tted behind the
front casings.
- The boiler is entirely prewired.

Remeha Gas 350
4
kW
3. TECHNICAL INFORMATION AND DIMENSIONS
4
5
6
7
8
9
80
108
134
161
188
214
Number of
sections
Heat
input
Hs
Fig. 01 Dimensions
Rear view
Side view Front view
Heat
output
kW
64
87
109
130
152
174
mbarmbar
A
mm
B
mm
E
mm
F
mm
t = 10°C
l
640
740
840
940
1040
1140
280
330
380
430
480
530
905
905
905
930
930
930
200
200
200
200
250
250
1030
1030
1030
1080
1080
1080
165
165
165
215
215
215
Boiler
weight
Dimensions Water
resistance
Water
content
C
mm
Ø D
mm
5
13
21
30
41
52
t = 20°C
2
3
5
8
10
13
45
51
58
65
71
78
335
390
445
500
555
610
kg/h
Mass
flue
rate
219
239
255
271
398
407
kg

5
4. APPLICATION
4.1 L.P.H.W. system
4.1.1 Water temperature
Maximum water temperature is 110° (high limit
thermostat).
Highest boiler water temperature is 95° (control
thermostat).
Minimum return water temperature is 20° at a fl owrate
related to a t of 20° (fl ow/return temperature).
4.1.2 Water pressure
Boiler sections pressure test at 10 bar.
Maximum pressure test boiler block is 8 bar.
Maximum working pressure is 6 bar.
Minimum working pressure boiler is 0.8 bar.
Optional a water pressure switch set at 0.8 bar can be
supplied with the boiler.
4.1.3 Water fl ow
The minimum water fl ow through the boiler is:
Output boiler in kW = ... m3/h
93
This minimum fl ow must be maintained for 5 minutes after
the burners stops fi ring to avoid high temperature shut-
down due to residuel heat gain.
Due to the design and manufacture of the boiler no specifi c
minimum water fl ow requirement exists other than high-
temperature protection.
4.1.4 Water treatment
Water treatment under normal circumstances is not
necessary (see our water quality recommendations).
4.1.5 Noise level
The noise level measured around the boiler depending
on boiler room construction is about 50 dBA.
(Noise level taken at 1 meter from the boiler).
4.2 Chimneys
The average fl ue gas temperature is so low that the
chimney must be in accordance with the guidelines of
British Gas and BS 6644.

Remeha Gas 350
6
5. TYPICAL BOILER INSTALLATIONS
Fig. 02 Installation 1
Fig. 03 Installation 2
4
5
6
7
8
9
Dimensions (mm)
ABEØ D
C
640
740
840
940
1040
1140
200
200
200
200
250
250
905
905
905
930
930
930
1030
1030
1030
1080
1080
1080
Number of
sections
280
330
380
430
480
530
V = min. length 0.5 m
before elbow, thus
avoiding down-draught
W = min. 150 mm with
vertical flue outlet
W = min. 0.5D + 50 mm
with horizontal flue
outlet
* = free access to rear of
boiler
* = free access to rear of
boiler
1 boiler in boiler room
2 boilers in boiler room

7
6. REGULATION AND SAFETY EQUIPEMENT
6.1 General
The Remeha Gas 350 is supplied with electronic control
and safety equipment with ionisation fl ame detection.
6.2 Instrument panel
The Remeha Gas 350 is supplied with an instrument
panel that is fi tted in the front of the boiler. The standard
instrument panel can be extended with the fi tting of
the following options: hour run meters, water pressure
switch, down draught thermostat, no volt contacts and/or
rematic® control.
All connections are pre-wired and fi tted with plugs. The
capillaries from the control panel should be fi tted in the
pocket of the boiler, which is fi tted in the fl ow connection
of the boiler.
6.3.2 Specifi cation
1 Gas Multi-Bloc contains A.B. .
A 2 Safety shut off valves
B 1 Gas governor
1 Gas fi lter
1 Pilot gas valve
1 Pilot burner with ionisation probe
and ignition probe.
6.3.3 Control panel behind front panel
1 ontrol box Satronic
1 Ignition transformer 16 kV.
6.4 Functions
6.4.1 Flame protection
Flame protection by means of ionisation fl ame detection.
6.4.2 Down draught thermostat
Optional the boiler can be fi tted with a down draught
thermostat. When there is down draught of the fl ue gases
this thermostat will switch off the boiler.
Fixed setpoint is 70° .
6.4.3 Thermostats
ontrol thermostat On/Off 35°-95° .
ontrol thermostat High/Low 35°-95° .
High-Limit thermostat locks out at 110° .
6.3 Standard electronic gas train High/Low
6.3.1 Schematic
Fig. 05 Gastrain
Legend
A Gas cock
AB ilot burner
DR Gas governor
F Gas fi lter
HB Main gas burners
MB Gas multibloc
OT Ignition transformer
MK ilot gas valve
M Measuring point
VA Safety shut off valve
VB Ionisation probe
- - - - Not supplied.
6. Analogue thermometer for water temperature
7. High - Limit thermostat 110° (pre set)
8. Warning light (lock out)
9. Option for rematic® weather compensator
8
7
5
4
9
1236
Fig. 04 Layout of the instrument panel, extended with hour counters
1. Operating switch (On/Off)
2. ontrol thermostat On/Off. Setting between 35 - 95°
3. ontrol thermostat high/low. Setting between 35 - 95°
4. Hour run meter total running hours (not standard)
5. Hour run meter full load hours (not standard)

Remeha Gas 350
8
7. ASSEMBLING AND INSTALLATION GUIDELINES
8.1 General
The gas train is fi tted behind the front casing.
The local Gas authority should be consulted to ensure
that an adequate pressure and supply is available at the
boilers maximum output. To minimise risk of sediment or
foreign particles entering the control valves, an approved
fi lter may be fi tted into the pipe work downstream.
The gas supply should be conform to the British Gas
safety regulations.
8.2 Gas pressure
Maximum gas pressure at inlet 100 mbar.
Burner pressure:
- full load : 14.0 mbar (100%)
- part load : 5.0 mbar (60%)
- injector size : 4.0 mm Ø
Note: L G version on request.
8. GAS SUPPLY
9. ELECTRICAL SUPPLY
9.1 General
The electrical installation must conform to the IEE
regulations and also to local authority requirements.
9.2 Control panel
A control panel is fi tted behind the front casing.
9.3 Electrical connections
The boiler is pre-wired. Only the main supply should be
wired to the control panel.
9.4 Electrical data
Main supply : 230 V-50Hz (L/N).
Running current : 110 W.
Installed fuse : 6,3 Amp. (slow acting).
7.3 Water connections
The boiler water connections (2" male thread) are fi tted
at the rear of the boiler (right hand connections only).
The two sections have a 3/4" BSP tapping, the right hand
end section to accept a drain/off cock and the left hand
end sectiond to accept a plug.
7.4 Pocket for instrument panel
The pocket is fi tted in the fl ow connection of the boiler.
7.5 Water pressure
Each section is hydraulically tested to at least 10 bar.
Maximum test pressure for the assembled boiler block is
8 bar. Operating pressure between 0.8 bar and 6 bar.
Optional the boiler can be fi tted with a water pressure
switch, set at 0.8 bar.
7.1 General
The boiler is suitable for operating at a maximum working
pressure of 6 bar and a minimum pressure of 0.8 bar.
Boiler can be installed in open or closed systems.
7.2 Boiler assembly
Broag can provide special tools on loan, for the boiler
assembly when the boiler is being delivered in parts, with
detailed building instructions. However, building supervision
and/or actual boiler erection ser vi ces can be provided by
Broag or an approved boiler erection engineer.

9
9.5 Wiring diagram boiler
Fig. 06 Wiring diagram

Remeha Gas 350
10
10. COMMISSIONING
Note:
ommissioning to only be carried out by a qualifi ed
engineer with the relevant training and certifi cation i.e.
Acops- orgi and a commissioning data sheet completed
on site for issue of owner.
10.1 Technical information
ontrol box: Satronic DKG972.
Main supply: 230 V-50 Hz.
Minimum ionisation current: 3 µA.
Reaction time fl ame protection: 1 sec.
Safety time: < 10 sec.
Maximum ambient temperature: 60° .
Injector size pilot burner: Ø 0.5 mm.
Injector size main burner: Ø 4.0 mm.
Burner pressure full load: 14.0 mbar (100%).
Burner pressure part load: 5.0 mbar (60%).
Start repetition: 5x.
Warning:
Control box operates on a neutral/phase supply.
10.2 Commissioning the boiler
1. heck gas connections.
2. heck electrical supply (L/N and earth).
3. heck water connections and if installation is fi lled.
4. Switch on circulation pump and check rotation
direction.
5. Open main gas cock (release air in gas pipe work).
6. Switch on electrical supply.
7. Set the control thermostats at about 85° .
8. After a waiting time of about 3 seconds you will get
ignition. At a minimum ionisation current of 3 µAmp
the safety gas valve will open. The boiler is on.
9. Let the boiler run for a couple of minutes to get rid
of air in the gas pipe.
10. Set the correct burner pressure.
11. heck the thermostats for correct operation.
12. heck the fl ame protection, by starting the ionisation
probe disconnected.
13. Send the commissioning reports to Broag.
10.3 Switching off the boiler
1. Set boiler controls to off.
2. Allow system to cool.
3. Switch off the electrical supply.
4. Turn off the gas cock.

11
11.1 General
It is essential for effi cient operation, to clean the boiler,
the gas train and boiler room once a year.
11.2 Maintaining the boiler
1. Remove the front casing of the boiler.
2. Remove the top casing and the top of the fl ue hood.
3. lean the internal fl ue ways of the boiler with a
steelcleaning brush (available from Broag).
4. lean the boiler room and the fl oor underneath the
boiler.
5. lean the burners internally and externally and
check the kanthal bars.
11. MAINTENANCE
6. lean the boiler casings.
7. lean the gas train, ignition, pilotburner, thermostats
and wiring.
8. heck the gas train and pipe for gas leakage.
9. heck the start program, ignition time and safety
times.
10. heck fl ame protection and thermostats.
11. heck the boiler input at 100% (full load) and 60%
part load).
12. Make a combustion effi ciency calculation.
13. heck the boiler and installation for water leakage.

12
© Copyright
All technical and technological information contained in these technical instructions,
as well as any drawings and technical descriptions furnished by us remain our
property and shall not be copied in part or whole without our prior consent in writing.
ISO 9001
since 1988
Subject to alterations
51247/1.500/02.01/Ho.
Broag Ltd.
Head office
Remeha house
Molly Millars Lane
Wokingham,
Berkshire RG41 2QP
Tel.: [phone]
Fax: [phone]
E-mail address:
[email protected]
Branch office
Unit 3, Kestrel lose,
Quarry Hill ind. Estate,
Ilkeston
Derbyshire DE7 4RD
Tel.: [phone]
Fax: [phone]
Remeha Gas 350