Riello RTS 2S Seies Owner's manual

STEEL
BOILERS
INSTALLATION, OPERATION, MAINTENANCE AND
SYSTEM MANAGEMENT MANUAL
RTS 2S

2
The rRTS 2S boilers conform to the Efficiency Directive 92/42/CEE.
When used in conjunction with a CE marked jet burner, they also satisfy the requirements of the
Gas Appliances Directive 2009/142/EC (until 20 April 2018) and Regulation (EU) 2016/426 (from 21
April 2018) and applicable sections of the Electromagnetic Compatibility Directive 2014/30/UE and
Low Voltage Directive 2014/35/UE.
CONFORMITY
RANGE
CHARACTERISTICS
- High efficiency
- Low emissions (when fitted with a low NOx burner)
MODEL CODE
RTS 115 2S 20039921
RTS 150 2S 20033204
RTS 200 2S 20033205
RTS 247 2S 20033206
RTS 319 2S 20033207
RTS 410 2S 20033209
RTS 526 2S 20033210
RTS 736 2S 20040152
RTS 850 2S 20047146
RTS 1012 2S 20041609
RTS 1200 2S 20047147
RTS 1355 2S 20043557
RTS 1500 2S 20047148
RTS 1850 2S 20046225

3
Dear Customer,
Thank you for choosing a r RTS 2S,boiler. You have purchased a modern, high efficiency,
quality product that is designed to give dependable and safe service and to provide comfort in the
home for many years to come. Arrange for your boiler to be serviced regularly by an authorised
rTechnical Assistance Centre. Their personnel are specially trained to keep your boiler efficient
and cheap to run. Technical Assistance Centres also stock any original spare parts that might be
required.
This instruction manual contains important instructions and precautions that must be observed to
ensure the trouble-free installation and efficient functioning of your r RTS 2S boiler.
Please accept our renewed thanks for your purchase.
Riello S.p.A.

4
CONTENTS
GENERAL
General safety information page5
Precautions “ 5
Product description “ 6
Control panels “ 7
Recommended burners “ 7
Product identification “ 10
Technical specifications “ 10
SYSTEM MANAGER
Start up page 11
Temporary shutdown “ 12
Preparing for extended periods of disuse “ 13
Cleaning “ 13
Maintenance “ 14
Useful information “ 14
INSTALLER
Unpacking the product page 15
Overall dimensions and weights “ 16
Handling “ 16
Place of installation “ 17
Installation in older systems and systems
requiring modernisation “ 18
Water connections “ 18
Anti-condensate pump “ 20
Combustion gas exhaust “ 20
Boiler door hinges “ 21
Changing the direction of door opening “ 21
Earth connection “ 25
Fitting the casing panels “ 26
Location of sensors “ 28
TECHNICAL ASSISTANCE SERVICE
Preparing for initial start-up page 29
Initial start-up “ 30
Checks during and after initial start-up “ 31
Maintenance “ 32
- Opening the door “ 32
- Adjusting the door “ 32
Cleaning the boiler “ 33
Troubleshooting “ 34
The following symbols are used in this manual:
b CAUTION! = Indicates actions that
require caution and adequate preparation
aSTOP! = Identifies actions that you MUST NOT
do
This manual, Code 20035753 Rev. 16 (12/17) is made
up of 36 pages.
CONTENTS

5
GENERAL SAFETY INFORMATION
PRECAUTIONS
aDo not allow children or infirm persons to operate
this r RTS 2S boiler unsupervised.
a Do not operate any electrical devices or equipment,
including switches or domestic appliances, etc., if
you can smell fuel or fumes. If you detect any suspi-
cious smells:
- Ventilate the room by opening all doors and win-
dows.
- Close the fuel shut-off cock.
- Report the fault immediately to the rTechnical
Assistance Service or a professionally qualified
heating engineer.
aDo not touch the boiler while barefoot or wet.
aNever clean or service the boiler without first dis-
connecting it from the mains electricity supply
by turning the main power switch and the control
panel switch OFF.
aDo not tamper with or adjust the safety or control
devices without prior authorisation and instructions
from the boiler’s manufacturer.
b The boiler is delivered in separate crates. Check
that it is complete, undamaged and as ordered as
soon as you receive it. Report any discrepancies or
damage to the dealer who sold it.
b The Law requires that this r RTS 2S boiler
be installed by a qualified installation company.
On completion of the installation, the installer must
issue the owner with a declaration of conformity
confirming that the installation has been completed
to the highest standards in compliance with the
instructions provided by rin this instruction
manual, and that it conforms to all applicable laws
and standards.
b The boiler must only be used for the purpose
specified by rand for which it is designed. The
manufacturer declines all responsibility, contractual
or other, for damage to property or injury to persons
or animals caused by improper installation, adjust-
ment, maintenance or use.
b If you notice any water leaking from the boiler, dis-
connect it immediately from the mains electricity
supply, shut off the water supply, and notify your
local rTechnical Assistance Centre or a quali-
fied heating engineer immediately.
The operation of any appliance that uses fuel, electrical power and water demands that a number of fundamental safety
precautions be respected.
b Periodically check that operating pressure in the
water circuit is over 1 bar but below the maximum
limit specified for the boiler. If this is not the case,
contact r’s Technical Assistance Service or a
professionally qualified heating engineer.
b If the boiler is not going to be used for an extended
period of time, contact r’s Technical Assistance
Service or a qualified heating engineer to have it
prepared for shut-down as follows:
- Switch the boiler OFF at the control panel and at the
mains power switch
- Close the fuel cock and heating circuit water cock
- Drain the central heating circuit if there is any risk of
freezing.
b Drain the central heating circuit if there is any risk of
freezing
b This instruction manual is an integral part of the boil-
er. It must be kept safe and must ALWAYS accom-
pany the boiler, even if it is sold to another owner or
transferred to another user or to another installation.
If you damage or lose this manual, order a replace-
ment immediately from your local rTechnical
Assistance Centre.
aNever pull, disconnect, or twist the electrical cables
coming from the boiler even if it is disconnected
from the mains electricity supply.
aDo not obstruct or restrict the vents in the room
where the boiler is installed. Adequate ventilation is
essential for correct combustion.
aDo not expose the boiler to the elements. Do not
install the boiler outdoors. It is not designed to work
outdoors and is not fitted with the necessary auto-
matic anti-frost systems to do so.
aDo not switch the boiler off if outdoor temperature
drops below ZERO (risk of freezing).
aDo not store containers of flammable substances in
the room where the boiler is installed.
aDo not dispose of packaging material into the envi-
ronment, or leave it within the reach of children,
since it can become a potential hazard. Dispose of
packaging material in compliance with applicable
legislation.
GENERAL

6
PRODUCT DESCRIPTION
r RTS 2S steel boilers are high efficiency triple flue
pass boilers for central heating systems. When com-
bined with a storage cylinder, they can also be used to
produce domestic hot water.
r RTS 2S boilers are monobloc boilers with pressur-
ised combustion. The flame from the burner first enters
the furnace (1st flue pass). Via an opening at the other
end of the furnace, the combustion gases then enter a
duct that takes them back towards the front of the boiler
(2nd flue pass).
This separation between the combustion gas return duct
and the furnace makes a major contribution to reducing
Nox emissions. Combustion gases remaining in the high
temperatures of the furnace is one of the main reasons
for the formation of NOx emissions.
At the front of the boiler, the combustion gases pass
through a recess in the door insulation and exit through
the tube bundle (3rd flue pass).
In the tube bundle, turbulators force the combus-
tion gases into a vortex-like path that improves the
efficiency of convection heat exchange. This system
achieves maximum heat absorption without risking dam-
age through thermal stress.
Once out of the tube bundle, the flue gases pas through
a chamber at the rear of the boiler, and into the vent flue.
Their special design (with tube bundle over the combus-
tion chamber) makes these boilers far narrower than
conventional pressurised boilers and therefore easier to
install in boiler rooms with narrow doors or where space
is limited.
The burner is installed in a hinged door to permit the
adjustment and servicing of both boiler and burner with-
out having to remove the burner.
The boiler body is thermally insulated by high efficiency
mineral wool insulation that reduces heat loss to an
extremely low level.
The boiler casing is made from pre-painted panels lined
with mineral wool insulation.
b Admissible return temperature: 55°C.
1
2 34 5
6
7
8
9
1013
11
12
1 - Door hinge
2 - Central heating return
3 - Central heating flow
4 - Safety device fitting
5 - Flue gas box
6 - Flue gas exhaust
7 - Access door for cleaning the flue gas box
8 - Condensate drain
9 - Boiler drain
10 - Door
11 - Flame inspection window
12 - Burner plate
13 - Control panel
GENERAL

7
CONTROL PANELS
The r control panels that can be used with r RTS 2S steel boilers are listed below. These control panels cater for
all the needs of the heating system and of all the devices installed in it.
b When a 5000 CL/M, TECH CLIMA TOP or CLIMA COMFORT control panel is installed, the boiler return (cold) line
must be equipped with a temperature sensor socket.
See the catalogue for the necessary accessory part numbers.
5000 EB/T for central heat-
ing only or central heating and
domestic hot water production
with a single/two stage burner.
5000 TMR 2 for central heating
only with single/two stage ther-
mostatic burner.
5000 CL/M for central heating
with a single stage, two stage,
or modulating burner and a tem-
perature control card. This type
of control panel also acts as
master control panel in cascad-
ed installations.
TECH CLIMA TOP for central
heating (1 direct zone and 2
mixed zones) and domestic hot
water production with a single
stage, two stage, or modulating
burner. Also for controlling solar
heating system and cascaded
boiler systems.
TECH PRIME for central heating
only (1 direct zone) with a single
or two stage burner.
TECH CLIMA COMFORT for
central heating (1 direct zone
and 1 mixed zone) and domestic
hot water production with a sin-
gle stage burner.
Also for controlling solar heat-
ing system and cascaded boiler
systems.
TECH PRIME ACS for central
heating (1 direct zone) and
domestic hot water production
with a single or two stage burner.
GENERAL

8
BURNER RTS 2S Burner plate
Model Code Type 410 526 736 850 1012 1200 1355 1500 1850 Code
G
A
S
RS 44/1 MZ t.c. 3788600 Single stage •4031395
RS 44 MZ t.c. 3789100 Two stage •4031192 - 4031395
RS 50 t.c. 3784700 Two stage •4031395
RS 100 t.c. 3785300 Two stage ••• 4031188 - 4031188 -
20043900
RS 130 t.c. 3785500 Two stage • • 20043900
RS 190 t.c. 3785812 Two stage ••• 20047680
RS 45/M BLU
(Low NOx) 3897304 Modulating •4031395
RS 68/M BLU
(Low NOx) 3897404 Modulating •4031196
RS 120/M BLU (Low
NOx) 3897604 Modulating ••• 4031196 - 4031196 - 20043900
RS 160/M BLU (Low
NOx) 3788008 Modulating ••• 20047680
RS 200/M BLU (Low
NOx) 3899700 Modulating •20047680
RS 45/E BLU t.c.
(Low NOx) 3897330 Modulating •4031395
RS 68/E BLU t.c.
(Low NOx) 3897430 Modulating •4031196
RS 120/E BLU t.c.
(Low NOx) 3897630 Modulating ••• 4031196 - 4031196 - 20043900
RS 160/E BLU t.c.
(Low NOx) 3788030 Modulating ••• 20047680
RS 200/E BLU t.c.
(Low NOx) 3899800 Modulating •20047680
RS 44/M MZ t.c. 3788800 Modulating •4031395
RS 50/M MZ t.c. 3781620 Modulating •4031395
RS 100/M t.c. 3789700 Modulating • • 4031188
RS 130/M t.c. 3789800 Modulating • • 20043900
RS 190/M t.c. 3787621 Modulating ••• 20047680
G
A
S
O
I
L
RLS 50 3484600 Two stage •4031395
RLS 70 3485000 Two stage • • 4031188
RLS 100 3485200 Two stage • • 4031196 - 20043900
RLS 190/M MZ 3488100 Two stage ••• 20047680
RLS 250/M MZ 3482800 Two stage •20047680
O
I
L
RL 64 MZ 3470400 Two stage • • 4031188
RL 50 3474630 Two stage •4031395
RL 100 3475230 Two stage ••• 4031188 - 4031188 -
20043900
RL 130 3475430 Two stage ••• 20043900
RL 190 3475612 Two stage • • 20047680
RL 42 BLU
(Low NOx) 20027568 Two stage •4031188
RL 38/M 3471400 Modulating •4031395
RL 50/M 3471600 Modulating •4031395
RL 55/M BLU
(Low NOx) 3899200 Modulating •4031196
RL 85/M BLU
(Low NOx) 3896010 Modulating •4031196
RL 100/M 3477210 Modulating ••• 4031188 - 4031188 -
20043900
RL 130/M 3477410 Modulating ••• 20043900
RL 190/M 3477210 Modulating • • 20047680
N
A
P
H
T
H
A
P 60/N ECO t.c. 3435021 Two stage • • 4031197
P 100/N ECO t.c. 3436021 Two stage •4031196
P 140/N ECO t.c. 3436921 Three stage • • 20051781 - 4031396 -
4031396
P 200/N ECO t.c. 3437831 Three stage •••• 20051785
b To assemble/disassemble the burners equipped with recirculation tube, it might be necessary to remove the latter
before carrying out such operations (strictly comply with the use and maintenance manual of the burner).
RECOMMENDED BURNERS
The burners recommended to obtain the best possible performance from r RTS 2S boilers are:
GENERAL

9
b See the instruction manual provided with the burner for further information on burner installation, electrical con-
nections, burner adjustments. If a two stage burner is installed, 1st stage heat input must not be less than 70% of
total heat input.
A
ø
L
If you are installing a new boiler but re-using an old
burner, always perform the following checks.
- Make sure that the performance of the old burner is
adequate for the requirements of the boiler.
- Make sure that the length and diameter of the burner’s
blast tube are as specified in the following table.
b When you finish installing the burner in the boiler,
fill the gap between the burner’s blast tube and
the refractory material in the door with the ceramic
insulation (A) supplied with the boiler.
aDo not re-use old burners if their blast tube lengths are below those specified in the table.
RTS 2S 115 150 200 247 319 410 526 736 850 1012 1200 1355 1500 1850
L min 128 128 128 128 155 155 195 195 195 200 205 205 205 205 mm
Diameter of door hole 140 140 162 162 180 190 205 205 205 230 230 230 230 270 Ø mm
Thickness of door 93 93 93 93 103 103 118 119 119 119 119 119 119 119 mm
L < S
S
L
IMPORTANT NOTES FOR BURNER
INSTALLATION
Before fixing the burner to the boiler, make sure that:
- The door opens the right way (see the relevant sections
for details on how to reverse the door).
- The length (L) of the burner fixing bolts is less than
(S), i.e. the total depth of the seal, plates and washer.
Longer bolts can cause the door to warp, compro-
mising its ability to seal the boiler hermetically and
permitting the release of combustion fumes.
To ensure correct burner installation, also refer to the
burner’s own manual.
GENERAL

10
PRODUCT IDENTIFICATION
b If these plates or any other means of clearly identifying the product are defaced, removed or lost, proper installa-
tion and servicing may be rendered difficult.
-Serial number plate
This is located on the boiler body and speci-
fies the serial number, model, furnace power
and maximum operating pressure.
-Data plate
This lists the technical specifications and per-
formance of the product.
It comes inside the documentation envelope.
On completion of the installation you MUST
apply it in a clearly visible position at the top
of one of the side panels.
If you damage or lose this label, order a
replacement immediately from r’s
Technical Assistance Service.
The boilers are identified by two plates:
23270000581
WEEK OF
MANUFACTURE
TECHNICAL SPECIFICATIONS
b The stack must guarantee the minimum draught specified by applicable technical standards, assuming zero pres-
sure at the connection to the flue gas exhaust.
(*) Flue gas temperature with boiler functioning at 80/60°C and a room temperature of 20-25°C.
RTS 2S 115 150 200 247 319 410 526 736 850 1012 1200 1355 1500 1850
Fuel Gas / Oil
Rated heat input minimum 79 124 162 215 266 343 440 564 789 911 1085 1286 1452 1658 kW
maximum 125 163 216 264 341 439 563 787 909 1082 1283 1449 1609 1980 kW
Rated useful heat output
Pn
minimum 74 116 151 201 248 320 411 527 737 851
1013 1201 1356 1501
kW
maximum 115 150 200 247 319 410 526 736 850
1012 1200 1355 1500 1850
kW
Useful efficiency at min. Pn 93,4 93,4 93,4 93,4 93,4 93,4 93,4 93,4 93,4 93,4 93,4 93,4 93,4 93,4 %
at max. Pn 92,2 92,2 92,7 93,5 93,5 93,5 93,5 93,5 93,5 93,5 93,5 93,5 93,2 93,5 %
Useful efficiency at 30% (Pn Max) 97,2 97,2 97,2 97,2 97,2 97,2 97,2 97,2 97,2 97,2 97,2 97,2 97,2 97,2 %
Constant pressure drop (Pn Max) < 1,4 < 1,2 < 1,0 %
Flue gas temperature (∆T°) 160÷170 (*) °C
Flue gas mass flow rate (Pn Max) 0,054 0,071 0,093 0,117 0,152 0,193 0,248 0,34 0,395 0,475 0,547 0,609 0,677 0,857 Kg/s
Furnace pressure 1,2 1,6 1,8 3 2,4 3,7 2,2 4,8 6,8 6,1 9,8 5,1 7 7,2 mbar
Furnace volume 75 121 176 176 240 296 453 613 613 812 812 1065 1065 1297 dm3
Total volume of flue gas side 112 176 253,5 261,5 357,5 443 682 899 899 1209 1209 1656 1656 2088 dm3
Surface area for heat exchange 3,77 5,32 7,34 8,16 10,06 12,88 18,58 23,45 23,45 30,6 30,6 40,4 40,4 51,82 m2
Volumetric heat load (Pn Max) 1663 1345 1226 1501 1422 1481 1242 1284 1483 1333 1581 1361 1511 1527 kW/m3
Specific heat load (Pn Max) 30,6 28,8 27,4 30,9 32,4 32,5 28,9 31,5 36,3 33,6 39,2 33,6 37,1 35,7 kW/m2
Maximum operating pressure 6bar
Maximum admissible temperature 110 °C
Maximum operating temperature 95 °C
Min. admissible water return temperature
55 °C
Pressure drop ∆T 10° C 43 50 90 135 170 260 120 57 98 66 80 118 138 122 mbar
Pressure drop ∆T 20° C 12 10 20 34 40 60 34 16 30 20 28 29 38 35 mbar
Water capacity 176 255 319 309 408 495 655 899 899 1193 1193 1537 1537 2111 l
GENERAL

11
SYSTEM MANAGER
START UP
Have r’s Technical Assistance Service start up your r RTS 2S boiler for the first time. Once this has been done,
the boiler can be left to function automatically.
Under certain circumstances, such as after long periods of disuse, the service engineer responsible for the boiler may
need to re-start it without involving the Technical Assistance Service.
To do so, perform the following checks and operations:
- Check that the gas cock and heating water cock are
open.
- While the system is still cold, check that working pres-
sure in the water circuit is over 1 bar but below the
maximum limit specified for the boiler.
-
If the system is equipped with a temperature controller or
timer thermostat, make sure that it is switched on.
- Adjust the timer thermostat/s or temperature controller to
the desired temperature (~20° C).
- Turn the system’s main power switch ON.
- Turn the control panel power switch ON and make sure
that the green power indicator lights.
- Make the settings as instructed in the instruction man-
ual for your control panel.
ON
OFF

12 SYSTEM MANAGER
TEMPORARY SHUTDOWN
The burner should now ignite and remain in operation
until the set temperature is reached.
If any ignition faults or malfunctions occur, the burner
performs a “LOCKOUT SHUTDOWN”. This is shown by
the red button light on the burner and by the warning
light on the control panel.
b If a “LOCKOUT SHUTDOWN” occurs, wait about
30 seconds before resetting the burner.
To reset the burner, press the red button light on the
burner and wait until the flame ignites.
Repeat this operation 2 -3 times at the most. If the prob-
lem persists after that, call
r ’s Technical Assistance
Service.
If you need to shut down the system for a short period,
proceed as follows.
- Turn the control panel power switch OFF and make
sure that the green power indicator goes out.
- Turn the mains power switch OFF.
b Do NOT perform this procedure if outdoor tem-
perature falls below ZERO (risk of freezing).
Then proceed as follows:
- Make the settings as instructed in the instruction man-
ual for your control panel.
- Make sure that the temperature controller or timer /
room thermostat is set to “frost protection” mode
.
ON
OFF

13
SYSTEM MANAGER
PREPARING FOR EXTENDED PERIODS OF DISUSE
CLEANING
If the boiler is not going to be used for an extended
period of time, perform the following operations:
- Turn the control panel power switch OFF and make
sure that the green power indicator goes out.
- Turn the mains power switch OFF.
-
Close the fuel cock and heating circuit water cock.
- Drain the central heating circuit if there is any risk of
freezing.
b Contact r Technical Assistance Service if you
encounter any problems in completing the above
procedure.
Use a cloth damped in soapy water to clean the boiler’s
external casing.
To remove stubborn marks, use a cloth damped in a 50%
mix of water and denatured alcohol or a suitable clean-
ing product.
Carefully dry the boiler after cleaning.
aDo not use abrasive cleaning pads or powder
detergents.
a Never clean the boiler without first disconnecting it
from the mains electricity supply by turning the main
power switch and the control panel switch off.
b The combustion chamber and flue pipes must
be cleaned periodically by r’s Technical
Assistance Service or by a qualified heating engi-
neer (see page 32).
ON
OFF

14 SYSTEM MANAGER
MAINTENANCE
USEFUL INFORMATION
Seller: .............................................................................................................................................
Mr. .......................................................................................................................................................
Address .......................................................................................................................................
tel. .......................................................................................................................................................
Technical Assistance Service: ....................................................................
Mr. .......................................................................................................................................................
Address .......................................................................................................................................
tel. .......................................................................................................................................................
Fuel oil supplier: ............................................................................................................
Mr. .......................................................................................................................................................
Address .......................................................................................................................................
tel. .......................................................................................................................................................
Installer:.......................................................................................................................................
Mr. ......................................................................................................................................................
Address ......................................................................................................................................
tel. ......................................................................................................................................................
The Law requires that THE PERSON RESPONSIBLE
FOR SYSTEM MANAGEMENT MUST ENSURE THAT
PROFESSIONALLY QUALIFIED HEATING ENGINEERS
UNDERTAKE PERIODIC MAINTENANCE AND
COMBUSTION EFFICIENCY MEASUREMENTS.
r’s Technical Assistance Service is qualified to satisfy
these legal requirements and can also provide useful
information on MAINTENANCE PROGRAMMES designed
to guarantee:
- greater safety
- compliance with applicable legislation
- freedom from the risk of fines in the event of spot
checks.
Date Work done
Date Quantity supplied Date Quantity supplied Date Quantity supplied Date Quantity supplied

15
INSTALLER
UNPACKING THE PRODUCT
r RTS 2S steel boilers come in:
1) BOILER BODY CRATE to which is attached the
documentation envelope (A) containing:
- Instruction manual
- Data label (to be applied to the casing on comple-
tion of the installation)
- Certificate of Warranty and water test certificate
- Bar code labels
- Ceramic insulation.
b The instruction manual is an integral part of the
boiler. Once located, read it thoroughly and keep
it safe.
2) THE CASING PANELS complete with assembly
accessories.
3) THE FRONT COVER to fit on top of the front door.
IMPORTANT
For the boiler to function correctly, it must be connected
to a r TECH control panel and dedicated control
accessories.
Dimensions and weights of boiler casing panels
A
H
L
P
H
L
P
A
P
H
L
H
L
P
RTS 115÷526 2S
RTS 1355÷1850 2S
RTS 736÷1200 2S
DESCRIPTION CODE DIMENSIONS
LxPxH (mm)
Weight
(kg)
FRONT PANEL RTS 115 2S 20036649 700 x 230 x 140 2,1
CASING PANELS RTS 115 2S 20036648 930 x 200 x 1200 30
FRONT PANEL RTS 150 2S 20027723 740 x 230 x 140 2,2
CASING PANELS RTS 150 2S 20027717 640 x 250 x 1250 32
FRONT PANEL RTS 200-247 2S 20027724 800 x 160 x 260 2,6
CASING PANELS RTS 200-247 2S 20027718 700 x 270 x 1300 40
FRONT PANEL RTS 319-410 2S 20027726 920 x 160 x 230 2,75
CASING PANELS RTS 319 2S 20027719 740 x 250 x 1450 45
CASING PANELS RTS 410 2S 20027720 890 x 250 x 1450 50
FRONT PANEL RTS 526 2S 20027727 970 x 190 x 240 3,2
CASING PANELS RTS 526 2S 20027721 970 x 300 x 1720 66,8
FRONT PANEL RTS 736-850 2S 20027728 1030 x 230 x 160 3,2
CASING PANELS RTS 736-850 2S (*) 20027722 1070 x 280 x 1980 70,0
FRONT PANEL RTS 1012-1200 2S 20027725 320 x 180 x 1120 4,6
CASING PANELS RTS 1012-1200 2S (2 packs: A+B) (*) 20040166 990 x 320 x 1950 90
FRONT PANEL RTS 1355-1500 2S 20043541 345 x 185 x 1180 5,4
CASING PANELS RTS 1355-1500 2S (2 packs: A+B) 20043546 1080 x 360 x 2210 100
FRONT PANEL RTS 1850 2S 20046162 380 x 170 x 1280 6,0
CASING PANELS RTS 1850 2S (2 packs: A+B) 20046158 970 x 470 x 2120 126
(*) Casing panels supplied on the same pallet as the boiler.

16 INSTALLER
OVERALL DIMENSIONS AND WEIGHTS
HANDLING
Only use lifting equipment of adequate capacity to move
and handle the boiler.
Remove the fixing screws and remove the wooden pallet
before positioning the boiler. b Wear suitable personal protective equipment and
use suitable safety devices
b When moving the boiler, take particular care not to damage the front panel.
B
C
D
B1
A
A1 E
RTS 2S 115 150 200 247 319 410 526 736 850 1012 1200 1355 1500 1850
A - Width 660 710 760 760 820 820 890 1000 1000 1047 1047 1147 1147 1237 mm
A1 - Base width 580 640 690 690 750 750 790 900 900 980 980 1070 1070 1160 mm
B - Depth 1155 1330 1500 1500 1660 1960 2085 2375 2375 2657 2657 2954 2954 3173 mm
B1 - Base depth 860 1010 1180 1180 1296 1596 1692 1965 1965 2236 2236 2533 2533 2754 mm
C - Height 1205 1285 1390 1390 1524 1490 1685 1830 1830 1920 1920 2080 2080 2222 mm
D - Burner height 380 380 400 400 468 468 510 560 560 570 570 625 625 650 mm
E - Flue to base 180 190 200 200 225 225 250 270 270 270 270 270 270 270 mm
Weight (inclusive of casing) 335 420 515 535 715 840 1160 1500 1500 2040 2040 2627 2627 3440 kg

17
INSTALLER
PLACE OF INSTALLATION
r RTS 2S steel boilers must be installed in a dedi-
cated boiler room, with adequately sized vents, in com-
pliance with applicable laws and standards.
If at all possible, the boiler should be installed on a
raised base to prevent the burner fan sucking up dust.
The gas supply pipe must be installed in such a way that
the boiler’s panelling can be removed and the front door
opened without having to remove the burner.
b When installing the boiler, allow sufficient space
around it to access all safety and control devices
and to permit easy maintenance.
b If the specific weight of the gas supply to the burn-
er is greater than the specific weight of air, install all
electrical parts at least 500 mm above floor level.
aDo not install the boiler outdoors. It is not designed
to work outdoors and is not fitted with the neces-
sary automatic anti-frost systems to do so.
≥1 m A
B
≥1 m
≥L
≥1 m
>10cm
H
RTS 2S 115 150 200 247 319 410 526 736 850 1012 1200 1355 1500 1850
A- Length 660 710 760 760 820 820 890 1000 1000 1047 1047 1070 1070 1160 mm
B- Depth 1155 1330 1500 1500 1660 1960 2085 2375 2375 2657 2657 2533 2533 2754 mm
H- Heigjt 1150 1230 1320 1320 1470 1490 1685 1820 1820 1900 1900 2080 2080 2222 mm

18 INSTALLER
INSTALLATION IN OLDER SYSTEMS AND SYSTEMS REQUIRING MODERNISATION
WATER CONNECTIONS
r RTS 2S boilers are designed and made for use in central heating installations, but can also be used for domestic
hot water production if connected to a suitable storage cylinder. Water fittings are as specified in the following table:
When installing these boilers in old systems or systems requiring modernisation, always perform the following checks:
- Make sure that the stack is able to withstand the temperature
of the combustion gases and that it has been designed and
made in compliance with applicable standards. The stack
must also be as straight as possible, sealed, insulated and
not blocked or choked
- Make sure that the electrical system has been installed by a
qualified electrician in compliance with applicable standards
- Make sure that the oil feed line and any oil storage tank are
made and installed in compliance with applicable standards
- Make sure that the expansion vessels are big enough to
contain the volume generated by thermal expansion
- Make sure that flow rate, head and direction of flow of the
pumps are suitable and correct
- Make sure that the circuit has been flushed out to remove all
sludge and lime scale, and has been vented and seal tested
- Make sure that a suitable water treatment system is
installed if the quality of the supply/recirculation water
so demands (Refer to the reference values listed in the
table alongside).
REFERENCE VALUES
PH 6-8
Electrical conductivity below 200
mS /cm (25°C)
Chlorine ions below 50 ppm
Sulphuric acid ions below 50 ppm
Total iron below 0,3 ppm
Alkalinity M below 50 ppm
Total hardness 35° F
Sulphur ions none
Ammonia ions none
Silicon ions below 30 ppm
ABC
SC
S
Ø D
E
F
MI AS RI
G
RTS 2S 115 150 200 247 319 410 526 736 850 1012 1200 1355 1500 1850
A 320 335 348 348 360 390 395 450 450 512 512 514 514 563
B 530 650 800 800 890 1085 1200 1400 1400 1570 1570 1865 1865 2030
C 305 345 352 352 410 485 490 525 525 575 575 575 575 580
Ø D 180 200 250 250 250 250 300 350 350 400 400 400 400 450
E 870 946 1005 1005 1130 1130 1290 1405 1405 1445 1445 1580 1580 1695
F 175 150 148 148 187 187 185 205 205 190 190 218 218 190 mm
G 130 200 200 200 200 300 250 300 300 350 350 350 350 700 mm
Mi- Central heating flow (*) 2” 2” 2” 1/2 2”1/2 2”1/2 DN80 DN80 DN100 DN100 DN125 DN125 DN125 DN125 DN150 G” /DN
Ri - Central heating return (*) 2” 2” 2” 1/2 2” 1/2 2” 1/2 DN80 DN80 DN100 DN100 DN125 DN125 DN125 DN125 DN150 G” /DN
As - Safety device fitting 1”1/4 1”1/4 1”1/4 1”1/4 1”1/4 1”1/4 1”1/2 1”1/2 1”1/2 2”1/2 2”1/2 2”1/2 2”1/2 DN80 G” /DN
Sc - Condensate drain 3/4” 3/4” 3/4” 3/4” 3/4” 3/4” 3/4” 3/4” 3/4” 1” 1” 1” 1” 1” G” /DN
S - Boiler drain 3/4” 1” 1” 1” 1” 1” 1”1/4 1”1/4 1”1/4 1”1/4 1”1/4 1”1/4 1”1/4 1”1/4 G” /DN
(*) All flanged connections are PN6 according to EN 1092-1.

19
INSTALLER
b The choice of system components and the method of their installation are left up to the heating engineer installing
the system. Installers must use their expertise to ensure proper installation and functioning in compliance with all
applicable legislation.
b Circuits filled with anti-freeze must be fitted with water disconnectors.
3 4
18
5
5
3
3 4 5 314
315 16 3
13
9
6
12
3
3
4 5 3
3
2
3
17
8
11
67
3 10 15 3
3
33
2
17
1
rRTS 2S
0
30
60
90
1 - Boiler 2 - Central heating manifolds 3 - Disconnect valves 4 - Pumps 5 - Non-return valves 6 - Automatic vent valve
7 - Boiler safety valve 8 - Boiler drain cock 9 - Storage cylinder safety valve 10 - System filling cock 11 - CH expansion vessel 12 - Remote storage cylinder (r 7200)
13 - Storage cylinder drain cock 14 - DHW expansion vessel 15 - Softener filter 16 - Pressure reducer 17 - Drain 18 - Anti-condensate pump
SCHEMATIC DIAGRAM - 1 - CENTRAL HEATING AND DOMESTIC HOT WATER PRODUCTION
HEATING FLOW HEATING
RETURN
DHW USER
POINTS
INLET

20 INSTALLER
ANTI-CONDENSATE PUMP
COMBUSTION GAS EXHAUST
D
3√5 D
An anti-condensate pump operates during periods of
no heat request to avoid damage until the boiler returns
to a stable operating temperature. While the system is
operating, this pump must guarantee a flow rate between
20 and 30% maximum flow to ensure a water return
temperature no lower than 55 °C. Pump shutdown must
also be delayed for at least 3 minutes at the beginning of
extended periods of boiler shutdown (overnight or week-
end shutdown etc.).
b A sensor socket must be positioned at a distance
of 3 to 5 times the diameter of the water return
pipe, upstream from the water fitting, to measure
effective water return temperature and control the
anti-condensate pump or the temperature controller
stabilisation function.
b Any temperature controllers installed remotely from
the control panel must be compatible with the sys-
tem’s electrical connections and functioning logic.
0
30
60
90
Ø
H
The flue gas exhaust and its connection to the stack must be made in compliance with applicable laws and standards,
using heat resistant, condensate resistant and stress resistant rigid pipe and sealed joints.
RTS 2S 115 150 200 247 319 410 526 736 850 1012 1200 1355 1500 1850
Ø- Diameter 180 200 250 250 250 250
300
350 350 400 400 400 400 450 mm
H 870 946 1005 1005 1130 1130 1290 1405 1405 1445 1445 1580 1580 1695 mm