Riello TAU 150 N Guide

INSTALLATION, OPERATION, MAINTENANCE
AND SYSTEM MANAGEMENT MANUAL
STAINLESS STEEL
CONDENSING
BOILER
150 N ÷ 1450 N
150 NC ÷ 600 NC
TAU

2
TAU boilers conform to the Efficiency Directive 92/42/EEC ( ),
to Gas Directive 90/396/EEC and applicable sections of the Electromagnetic
Compatibility Directive 89/336/EEC and Low Voltage Directive 73/23/EEC.
0694
MODEL CODE
TAU 150 N 4031860.0
TAU 210 N 4031861.0
TAU 270 N 4031862.0
TAU 350 N 4031863.0
TAU 450 N 4031864.0
TAU 600 N 4031865.0
TAU 800 N 4031866.0
TAU 1000 N 4031867.0
TAU 1250 N 4031868.0
TAU 1450 N 4031869.0
MODEL CODE
TAU 150 NC 4031835.0
TAU 210 NC 4031836.0
TAU 270 NC 4031837.0
TAU 350 NC 4031838.0
TAU 450 NC 4031839.0
TAU 600 NC 4031849.0
CONFORMITY
RANGE

3
Dear Customer,
Thank you for choosing a rTAU stainless steel condensing boiler. You have purchased a
quality, high efficiency boiler that will give you dependable and safe service and provide comfort
in the home for many years to come. Arrange for your boiler to be serviced regularly by an autho-
rised 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 rTAU boiler.
Please accept our renewed thanks for your purchase.
Riello S.p.A.
On request, your Technical Assistance Centre will also provide you with a system service book. In Italy this is required
by Presidential Decree n° 412 of the 26th August 1993. Your Technical Assistance Centre will also be pleased to instruct
you how to get the best from your new boiler.

This manual, Code 20014315 - Rev. 11 (02/10) is made
up of 44 pages
CONTENTS
4
The following symbols are used in this manual:
b CAUTION! = Indicates actions that require cau-
tion and adequate preparation
aSTOP! = Identifies actions that you MUST NOT do
GENERAL Page
General safety information 5
Safety precautions 5
Product description 6
Control panels 7
Recommended burners 7
Product identification 8
Accessories 9
Technical specifications 9
SYSTEM MANAGER
Initial start-up 10
Preparing for extended periods of disuse 11
Cleaning 12
Maintenance 12
Useful information 13
INSTALLER
Unpacking the product 14
Overall dimensions and weights 15
Handling 15
Place of installation 16
Water in the central heating circuit 17
Water connections 21
Condensate drain 25
Condensate neutralisation 25
Combustion gas exhaust 27
Door hinges 27
Changing the direction of door opening 28
Removing the hinge assembly “B” 29
Fitting the panelling 30
TECHNICAL ASSISTANCE SERVICE
Preparing for initial start-up 31
Initial start-up 32
Checks during and after initial start-up 33
Maintenance 34
- Opening the door 34
- Adjusting the door 34
Cleaning the boiler 35
Troubleshooting 36
APPENDIX
Water treatment in domestic heating systems
(extract from Italian standard UNI 8065) 37
CONTENTS

GENERAL 5
TAU boilers are delivered in separate crates. Check
that the appliance is complete and undamaged as
soon as you receive it. Report any discrepancies
or damage to the rdealer who sold it.
This rTAU boiler must be installed by a legally
qualified installer. (In Italy, the law regulating profes-
sional installers is Law 46 of the 5th March 1990.)
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.
This boiler must only be used for the purpose spe-
cified by rand for which it is designed. r
declines all responsibility, contractual or other, for
damage to property or injury to persons or animals
caused by improper installation, adjustment, main-
tenance or use.
If you notice any water leaking from the boiler, imme-
diately disconnect it from the mains electricity supply,
shut off the water supply, and notify r’s Technical
Assistance Service or a qualified technician.
Periodically check that operating pressure in the
heating circuit is over 1 bar but below the maxi-
mum limit specified for the appliance. If this is
not the case, contact r’s Technical Assistance
Service or a professionally qualified technician.
If the boiler is not going to be used for an extended
period of time, contact r’s Technical Assistance
Service or a qualified technician to have the fol-
lowing minimum preparation carried out.
- Switch the appliance OFF at the control panel and
mains power switches
- Close the gas cock and heating water cock
- Drain the central heating circuit if there is any risk
of freezing.
The boiler must be serviced at least once a year.
This instruction manual is an integral part of the
boiler. It must be kept safe and must ALWAYS
accompany 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 r’s Technical Assistance
Service.
Do not allow children or infirm persons to operate
this rTAU boiler unsupervised.
Do not operate any electrical devices or equip-
ment, including switches or domestic appliances,
etc., if you can smell gas or fumes. If you detect
any suspicious smells:
- Ventilate the room by opening all doors and win-
dows.
- Close the gas shut-off cock
- Report the fault immediately to r’s Technical
Assistance Service or a professionally qualified
technician.
Do not touch the boiler while barefoot or wet.
Never clean or service the boiler without first
disconnecting it from the mains electricity supply
by turning the main power switch and the control
panel switch OFF.
Do not tamper with or adjust the safety or control
devices without prior authorisation and instruc-
tions from the boiler’s manufacturer.
Never pull, disconnect, or twist the electrical
cables coming from the boiler even if it is discon-
nected from the mains electricity supply.
Do no obstruct or restrict the vents in the room
where the appliance is installed. Adequate venti-
lation is essential for correct combustion.
Do not expose the boiler to the elements. It is not
designed for outdoor use.
Do not switch the boiler off if outdoor temperature
drops below ZERO (risk of freezing)
Do not leave flammable substances in the room
where the boiler is installed, even inside proper
containers
Do not dispose of packaging material into the
environment, or leave it within the reach of chil-
dren, since it can become a potential hazard.
Dispose of packaging material in compliance
with applicable legislation.
The operation of any appliance that uses electrical power demands that a number of fundamental safety precautions
be respected. In particular:
GENERAL SAFETY INFORMATION
PRECAUTIONS

GENERAL
6
Le caldaie in acciaio r TAU steel boilers are triple flue
pass, condensing boilers for installation in a boiler room.
While they are designed primarily for central heating
purposes, in conjunction with a suitable storage cylinder
they can also be used to produce domestic hot water.
All parts that come into contact with the combustion
gases are made from titanium stabilised stainless steel
to ensure maximum resistance to the corrosive action of
acid condensation.
The boiler has been designed with the combustion cham-
ber at the top and the smooth pipe tube bundle at the
bottom to optimise heat exchange and energy efficiency
and to maximise the condensing effect.
The boiler has a high total water content which is diffe-
rentially distributed between its top and bottom sections.
This allows outgoing water to reach the set temperature
quickly while maintaining the condensing effect and the
water heating time around the tube bundle for as long as
possible.
TAU boilers feature lightly pressurised combustion cham-
bers for a smoother burner action, and high temperature
resistant, stainless steel turbulators inside the tube bun-
dle for maximum burner efficiency.
The boiler body is thoroughly insulated with a layer of
high density glass wool.
The paint finished external panelling is also internally
insulated with a layer of high density glass wool.
The boiler’s front door and the flue gas chamber can be
opened completely to facilitate the inspection, mainte-
nance and cleaning of internal parts and to speed up
servicing in general.
The front door can open in either direction and can be
opened without removing the burner. The door is factory
fitted with hinges on the left, but these can be reversed if
necessary to suit individual installations.
1
17
19
18
2
3
45 678(*)(*)
9
10
11
12
14
15
16
13
1 - Burner
2 - Flame inspection window with
pressure measurement point
3 - Door
4 - Panelling
5 - Outlet
6 - Safety device fitting
7 - Heating return (high temperature)
8 - Heating return (low temperature)
9 - Blind plug
10 - Instrument bulb/probe socket
11 - Combustion chamber
12 - Flue connection
13 - Flue gas box
14 - Inspection door
15 - Condensate drain
16 - Boiler drain
17 - Turbulators
18 - Flue pipes
19 - Second flue pass
PRODUCT DESCRIPTION
(*) On the TAU 1450 N, the low temperature heating return (8) is located at the rear of the boiler, and
the safety fitting (6) is flanged.

b When a TECH CLIMA TOP or CLIMA COMFORT control panel is installed, the boiler return (cold) line must be
equipped with a temperature sensor socket.
GENERAL 7
The rcontrol panels that can be used with rTAU 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.
The burners recommended to obtain the best possible performance from rTAU boilers are:
( * ) Low Nox: low nitrogen oxide emissions.
NOTE: Burners must be fitted with a gas ramp device.
See the instruction manual provided with the burner
for further information on:
- burner installation
- electrical connections
- eurner adjustments.
CONTROL PANELS
RECOMMENDED BURNERS
BURNER TAU N-NC TAU N ACCESSORIES KIT
MODEL CODE 150 210 270 350 450 600 800 1000 1250 1450 BURNER PLATE LONG
HEAD
GAS
TWO STAGE
Gulliver BS 3D 3761716 (*) • 3001009
RS 34 t.c. 3789000
••
RS 44 t.c. 3789100 •
RS 50 t.c. 3784700 •
RS 70 t.c. 3785100 •
RS 100 t.c. 3785300 ••
RS 130 t.c. 3785500 •
RS 190 3785812 •
MODULATING
RS 34/M MZ t.c. 3788700 ••
RS 44/M MZ t.c. 3788800 •
RS 50/M t.c. 3781620 •
RS 70/M t.c. 3789600 •
RS 100/M t.c. 3789700 ••
RS 130/M t.c. 3789800 •
RS 190/M t.c. 3787620 •
Gulliver BS 3/M 3762300 (*) • 3002724
RS 25/M BLU 3910500 (*)
••
RS 35/M BLU 3910600 (*) •
RS 45/M BLU 3897304 (*) •
RS 68/M BLU 3897404 (*) •• 4031196
RS 120/M BLU 3897604 (*)
••
RS 160/M BLU 3788008 (*) ••
RS 25/E BLU 3910700 (*) ••
RS 35/E BLU 3910800 (*) •
RS 45/E BLU 3897330 (*) •
RS 68/E BLU 3897430 (*) ••
RS 120/E BLU 3897630 (*) •• 4031187
RS 160/E BLU 3788030 (*)
••
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 CLIMA COMFORT for
central heating (1 direct zone
and 1 mixed zone) and dome-
stic hot water production with a
single stage burner. Also for con-
trolling solar heating system and
cascaded boiler systems.
TECH CLIMA MIX for controlling
1 additional mixed zone.

GENERAL
8
A
Ø
L
Do not re-use old burners if their nozzle lengths are below those specified in the table.
- Serial number plate
This is located on the boiler body and specifies the
serial number, model, and furnace power.
- Data plate
This lists the appliance’s technical specifications
and performance.
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 replace-
ment immediately from r’s Technical Assistance
Service.
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.
TAU boilers are identified by two plates:
IMPORTANT!
If you are installing a new boiler but re-using an old bur-
ner, 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
nozzle are as specified in the following table.
When you finish installing the burner in the boiler, fill
the gap between the burner nozzle and the refrac-
tory material in the door with the ceramic insulation
(A) supplied with the boiler.
PRODUCT IDENTIFICATION
MODEL 150
N-NC
210
N-NC
270
N-NC
350
N-NC
450
N-NC
600
N-NC 800 N 1000 N 1250 N 1450 N
Min. L (mm) 160 216 216 216 216 250 250 250 280 350
Ø (mm) 130 140 140 140 152 179 179 179 189 222

GENERAL 9
The stack must guarantee the minimum draught specified by applicable technical standards, assuming zero pres-
sure at the connection to the flue.
Values obtained with rburners: BS - RS - RS.../M - RS.../M BLU.
The following accessories are available, to be ordered separately:
ACCESSORIES
TECHNICAL SPECIFICATIONS
(*) Depends on return temperature (30-60°C)
(**) At Pn max and output T = 80°C, return T = 60°C and CO2= 9.7%
ACCESSORY CODE
Burner plate for steel boilers 4031187
Burner plate 4031196
N2 neutralisation kit (TAU 150-350) 4031810
HN2 neutralisation kit (TAU 150-350) 4031811
N3 neutralisation kit (TAU 450-1250) 4031812
HN3 neutralisation kit (TAU 450-1250) 4031813
Description BOILER model
150
N-NC
210
N-NC
270
N-NC
350
N-NC
450
N-NC
600
N-NC 800 N 1000 N 1250 N 1450 N
Fuel GAS
Rated heat input (Q max) 150,0 210,0 270,0 349,0 450,0 600,0 800,0 1000,0 1250,0 1450,0 kW
Rated heat input (Q min) 111,0 151,0 211,0 271,0 350,0 451,0 601,0 801,0 1001,0 1251 kW
Rated maximum useful heat output
(80/60°C) (Pn max) 147,8 207,3 269,9 346,7 445,2 593,6 791,2 989,4 1236,7 1434,6 kW
Rated minimum useful heat output
(80/60°C) (Pn min) 108,2 147,2 205,7 265,6 339,5 437,5 583,0 777,0 971,0 1213,5 kW
Rated maximum useful heat output
(40/30°C) (Pn max) 159,7 223,6 290,2 375,2 481,5 642,0 802,5 1070,0 1337,5 1551,5 kW
Useful efficiency at Pn max (80/60°C) 98,5 98,7 99,9 99,3 98,9 98,9 98,9 98,9 98,9 98,9 %
Useful efficiency at Pn min (80/60°C) 97,5 97,5 97,5 98,0 97,0 97,0 97,0 97,0 97,0 97,0 %
Useful efficiency at Pn max (50/30°C) 106,5 106,5 106,5 106,5 106,5 106,5 106,5 106,5 106,5 106,5 %
Useful efficiency at Pn max (40/30°C) 106,5 106,5 107,5 107,5 107,0 107,0 107,0 107,0 107,0 107,0 %
Useful efficiency at 30% of Pn (30°C) 106,6 106,8 109,0 107,3 107,0 107,0 107,0 107,0 107,0 107,0 %
Losses from stack for sensible heat
(Qmax) 1,7 1,7 1,5 1,5 1,9 1,9 1,9 1,9 1,9 1,9 %
Losses from casing with burner on 0,3 0,3 0,5 1,0 0,6 0,6 0,6 0,6 0,6 0,6 %
Constant pressure drop <1 %
Flue gas temperature (ΔT) < 45÷75 (*) °C
Flue gas mass flow rate (Q max) (**) 0,07 0,09 0,12 0,15 0,20 0,26 0,33 0,43 0,54 0,63 kg/sec
Furnace pressure 2,0 2,7 3,2 4,6 5,0 5,5 5,7 6,3 6,8 7,4 mbar
Furnace volume 172,0 172,0 241,0 279,0 442,0 496,0 753,0 845,0 1037,0 1249,0 dm3
Total volume of flue gas side 253,0 277,0 413,0 482,0 737,0 860,0 1290,0 1454,0 1763,0 2097,0 dm3
Heat exchanger surface area 6,1 8,8 13,0 16,3 21,8 28,8 39,6 46,5 56,2 62,28 m2
Volumetric heat load (Q max) 872,1 1220,9 1120,3 1250,9 1018,1 1209,7 996,0 1183,4 1205,4 1160,9 kW/m3
Specific heat load 23,75 23,10 20,4 20,9 20,1 20,3 18,5 21,0 21,7 22,6 kW/m2
Maximum condensate production 18,4 27,4 31,9 40,9 52,2 73,8 88,0 111,4 132,7 159,5 l/h
Maximum working pressure 6 bar
Maximum admissible temperature 100,0 °C
Maximum working temperature 80,0 °C
Pressure drop ΔT 10°C 150,1 100,4 121,5 128,7 30,2 33,8 46,4 54,0 36,0 43,2 mbar
Pressure drop ΔT 20°C 36,3 28,4 30,6 28,7 8,5 9,0 13,4 16,3 10,2 11,3 mbar
Water capacity 323 360 495 555 743 770 1320 1395 1825 1900 l
Turbulators 22 39 52 59 72 90 106 114 130 145 n°

Have r’s Technical Assistance Service start-up your
rTAU 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
shut.
- While the system is still cold, check that working pres-
sure in the heating circuit is over 1 bar but below the
maximum limit specified for the appliance.
-
Since the control panel incorporates a temperature control
function, make sure that the control panel is switched on.
- Adjust the timer thermostat (if installed) or the temperatu-
re control 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
manual for your control panel.
SYSTEM MANAGER
10
INITIAL START-UP
10
ON
OFF