eta PU7 User manual

2020-07-21
EN
0000000061
V.022
1513
93003-003
PelletsUnit
7 - 15 kW
Installation

ETA Heiztechnik
Gewerbepark 1
A-4716 Hofkirchen an der Trattnach
Tel: [phone] / 22 88 -0
Fax: [phone] / 22 88 -22
[email protected]
www.eta.co.at

3
Contents
1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Warranty, guarantee and liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4 Dismantling, disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Energy Labelling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Regulations, standards and guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 CE-Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 Boiler room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.2 Safety devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7 Information for installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.1 Chimney. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.1.1 Planning and layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.1.2 Renovation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.2 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.3 Water hardness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.4 Corrosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.5 Bleeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.6 Pressure equalisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.7 Noise emission. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8 Operation with external air supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
9 Buffer storage tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9.2 Hydraulic integration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
10 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10.1 Placement of the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10.2 Removing panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10.3 Connecting piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
10.4 Conversion for buffer operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
10.5 Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
10.6 Filling the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
10.7 Attaching pellet hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
10.8 Network connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
11 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
11.1 Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
11.2 Overview of circuit boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
11.3 PE-C4 circuit board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
11.4 Circuit board GM-C3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

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11.5 Concluding activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
12 Pellet store . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
12.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
12.2 Requirements for pellet store . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
12.3 Calculating pellet supply and store size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
12.4 Filling nozzles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
12.5 No cables/pipes in the pellet store . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
12.6 Tilted floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
12.7 Information about pellet hoses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
12.8 Fire safety regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
12.9 Ventilation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

General Preface
5
1 General
1.1 Preface
Dear customer,
Safe and satisfactory operation of the product
depends, above all, on correct installation. In this user
manual, you can find out all the important installation
steps, information and instructions for this product
beforehand. Please take the time to look through it.
Warranty and guarantee
You should also read the "Conditions for warranty,
guarantee, liability" (see chapter 1.3 "Warranty,
guarantee and liability") carefully. As a rule, a profes-
sional heating technician shall satisfy these conditions.
Nevertheless, inform the technician of our warranty
conditions. All of the requirements we impose are
intended to prevent damage that neither you nor we
wish to occur.
Training the customer
To avoid errors in operation, please explain to your
customer exactly how his new product works and how
it should be operated and maintained.
Remote control of the boiler via the internet
The remote control enables you to operate your ETA
boiler remotely via your own network (VNC Viewer) or
the internet <www.meinETA.at> using a PC,
smartphone or tablet, as though you were standing
right in front of the ETAtouch control system of your
ETA boiler. A LAN cable is required for the connection
from the ETAtouch control system to the internet
modem.
Details for the remote control can be found in the
manual "Communication platform meinETA".
Details for the connection of the LAN cable, see 10.8
"Network connection".
Extended warranty
We grant an extended warranty if the product is com-
missioned by an authorised partner company or by our
own customer service. In this regard, please note the
warranty conditions applicable at the time of purchase.
Service agreement
You can ensure the best care for your heating system
by taking out a service agreement with one of our
certified contractors or our own customer service.
1.2 General information
Copyright
All contents of this document are property of ETA
Heiztechnik GmbH and are protected by copyright.
Any reproduction, transfer to third parties or use for
other purposes is prohibited without written permission
from the owner.
Subject to technical changes
We reserve the right to make technical modifications
without notice. Printing and typesetting errors or
changes of any kind made in the interim are not cause
for claims. Individual configurations depicted or
described here are only available optionally. In the
event of contradictions between individual documents
regarding delivery scope, the information in our current
price list applies.
Explanation of symbols
Instructions and information
Layout of safety instructions
SIGNAL WORD!
Type and source of danger
Possible effects
• Measures for avoiding the danger
Types of safety instruction
CAUTION!
On non-compliance with this safety instruction, there is
a risk of material damage.
WARNING!
On non-compliance with this safety instruction, there is
a risk of physical injury.
DANGER!
On non-compliance with this safety instruction, there is
a risk of major physical injury.

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Warranty, guarantee and liability General
1.3 Warranty, guarantee and liability
Requirements
We can only accept liability for the function of our
products if they are correctly installed and operated.
This is only possible if the conditions below are
complied with.
Maximum of 2,000 hours at full load per year
The boiler described in this user manual may only be
used for heating and producing hot water, with no more
than 2,000 full-load hours annually.
Installation in a dry room
For set-up, a dry room is required. In particular, only
condensation dryers may be used as clothes dryers in
the same room.
Observe local building and fire safety regulations
Local building and fire safety regulations must be
observed.
Connecting pipe to chimney
The connecting pipe to the chimney must be a
moisture-resistant stainless steel flue pipe with
maximum diameter of 120 mm and at least 3 cm of
insulation. For lengths over 2 m, correspondingly more
insulation is needed.
Suitable fuel
The boiler is suitable for use with wood pellets
according to EN ISO 17225-2:2014, quality class A1,
ENplus-A1. Operation with unsuitable fuels, in
particular those containing halogens (chlorine) or high-
slag pellets such as from grain waste, is not permitted.
Ensure supply air is free from aggressive
substances
The air supplied to the boiler must be free from
aggressive substances such as chlorine and fluorine
from solvents, cleaning agents, adhesives and propel-
lants, or ammonia from cleaning agents, to prevent
corrosion of the boiler and chimney.
Permissible water hardness
Water is the intended heat-transfer medium. For
special anti-frost requirements, up to 30% glycol may
be added. Softened water is required for the initial fill-
up of the heating system and for refilling after repairs.
Addition of hard water should be minimised to limit
limescale build-up in the boiler.
In order to protect the boiler from calcification, the
water hardness of the heating water must be
taken into account. Observe the indications outlined in
ÖNORM H 5195-1. Details can be found in chapter 7.3
"Water hardness".
pH value between 8 and 9
The pH value of water used to fill the heating system
must be between 8 and 9.
Use a sufficient number of shut-off valves
Set enough shut-off valves to avoid bleeding large
amounts of water during repairs. Any leaks in the
system must be repaired at once.
Sufficiently large expansion tank
To protect against air suction if the system cools off, a
specialist must design a sufficiently large expansion
tank. The 18-litre expansion tank built into the boiler is
sufficient for typical underfloor or radiator systems. If
there is a buffer storage tank, an additional expansion
tank will be needed.
Sufficient air venting must also be ensured. Open
expansion tanks or underfloor heating with permeable
piping also have a high air intake, resulting in above-
average boiler corrosion. Corrosion damage to the
boiler due to insufficient air venting or high air intake is
excluded from warranty, guarantee and liability.
Sufficient power
Continuous operation with heat consumption below
the minimum specified on the type plate is only
permitted with a buffer storage tank of sufficient size.
Expanding the control system
Only components provided by us may be used for
expanding the control system, unless these are
generally available standard devices, such as thermo-
stats.
Regularly perform cleaning and maintenance
Cleaning and maintaining the product is essential. The
required steps and intervals are either contained in this
documentation or included as a separate document.
Repairs
Repairs are only permitted using spare parts provided
by us. The only exceptions are common standardised
parts such as electrical fuses or fastening materials, as
long as they possess the required features and do not
restrict the functionality of the system.

General Dismantling, disposal
7
Proper installation
The installing contractor is liable for proper installation
according to the corresponding installation instructions
and the relevant rules and safety regulations. If you as
customer have installed the heating system partly or
entirely without relevant training and in particular
without up-to-date practical experience, without having
the installation checked by a trained and responsible
expert, we exclude defects in our delivery and conse-
quential damages resulting from this cause from our
warranty, guarantee and liability.
Repair of defects
For repairs of defects carried out by the customer or by
a third party, ETA shall only bear the costs or remain
obligated by warranty if this work was approved in
writing in advance by the customer service of ETA
Heiztechnik GmbH.
No tampering with boiler safety devices
Boiler safety devices such as those mentioned below
must not be tampered with: Temperature monitoring
and control devices, safety temperature limiters, safety
valves and thermal discharge valves.
1.4 Dismantling, disposal
Dismantling
Before dismantling:
• Stop heating. Switch off the boiler with the mains
switch and ensure that it cannot be switched back
on.
• Disconnect the boiler (and possibly also the fuel
conveying system) from all power sources.
Dismantling is done in the reverse order of assembly.
Clean the parts and remove them in accordance with
the local regulations for workplace safety and environ-
mental protection.
Disposal
Disposal including all components must be done in an
environmentally friendly manner according to waste
disposal laws. Recycle any materials that can be
recycled.

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Technical data
2 Technical data
Data sheet for PelletsUnit 7 - 15 kW
1 Pellet suction hose DN50
2 Pellet return air DN50
3 Return for heating circuit 1 and hot water tank, R3/4" coupling
4 Optional heating circuit 2 return, R3/4" coupling
5 Optional heating circuit 2 flow, R3/4" coupling
6 Flow for hot water tank, R3/4" coupling
7 Heating circuit 1 flow, R3/4" coupling
8 Discharge fitted with 1/2“ filling and drainage valve
9 Outlet for the safety valve, flat sealing union nut R1“
10 Air connection for external air operation, DN80

Technical data
9
The flue gas connection on the boiler does not yet give any indication of the required chimney diameter.
Information on the required chimney diameter can be found in the installation instructions for the boiler in the
Chimney chapter.
Subject to technical changes and errors
PelletsUnit Unit 711 15
Rated capacity kW 2.3 - 7.7 2.3 - 11.2 4.4 - 14.9
Efficiency at partial / full load (installation outside living area) %89.3 / 93.4 89.3 / 92.5 91.5 / 94.2
Transport dimensions, W x D x H mm 1072 x 600 x 1150
Weight kg 267
Water content litres 27
Available residual pump head at ΔT = 7 °C
Maximum floor heating pipe length per branch 100 m (better
80 m), for radiators variable-speed depending on flow tem-
perature
mWs / m³/h 3.8 / 0.9 3.5 / 1.3 2.4 / 1.8
Pellet bin on boiler (net) kg 30 kg (147 kWh)
Maximum distance to pellet store m20
Ash box volume litres 12
Flue gas mass flow rate at partial / full load g / s 1.9 / 4.4 1.9 / 6.4 2.8 / 8.4
CO2 content in dry flue gas at partial / full load %10 / 14 10 / 14.5 12 / 14
Exhaust temperature at partial / full load °C ~80 / ~150
Required flue draught Pa
> 3 Pa
a draught limiter is required above
15 Pa
Carbon monoxide (CO) emissions at partial / full load
mg/MJ 88 / 8 88 / 6 18 / 4
mg/m³
(13% O2)134 / 13 134 / 10 27 / 6
Dust emissions at partial/full load
mg/MJ 6 / 6 6 / 8 9 / 4
mg/m³
(13% O2)9 / 9 9 / 12 14 / 5
Unburned hydrocarbon emissions (CxHy) at partial/full load
mg/MJ < 1 / < 1 < 1 / < 1 < 1 / < 1
mg/m³
(13% O2)1 / < 1 1 / 1 1 / < 1
Electrical power consumption at partial/full load W46 / 61 46 / 63 66 / 95
Electrical power consumption in ready mode W12
Maximum permissible operating pressure bar 3
Temperature adjustment range °C 30 – 85
Maximum permissible operating temperature °C 95
Boiler class 5 acc. to EN 303-5:2012
Suitable fuels Pellets ISO 17225-2-A1, ENplus-A1
Electrical connection 1 x 230 V / 50 Hz / 13 A
Mode of operation non-condensing

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Energy Labelling Technical data
2.1 Energy Labelling
Labelling and ecodesign requirements for solid fuel boilers (Lot 15)
The required buffer volume for the boiler can be found in the assembly instructions. All boilers already have the
temperature controller integrated, so every product is a "package-system" (boiler with temperature controller).
PelletsUnit 7-15 kW
Unit
Model identification
PU7 PU7
BW
PU11 PU11
BW
PU15 PU15
BW
Item no. 12010-
D
12010-
D-BW
12012-
D
12012-
D-BW
12014-
D
12014-
D-BW
Rated heat output kW 7 11 15
Fuel supply (manual / automatic) automatic
Proportion of the partial load referred to the nominal
load (30% / 50%) %30
Temperature controller integrated in the boiler (yes /
no) yes
Temperature controller class VIII
Contribution of the temperature controller to the en-
ergy efficiency of the "package-system" % 5
Factor II (evaluation of primary solid fuel boiler and
additional heater) 0
Value for III (294/(11*Pr)) 3.82 2.39 1.79
Value for IV (115/(11*Pr)) 1.49 0.93 0.70
Condensing boiler (yes / no) no yes no yes no yes
Combination boiler for hot water and heating (yes /
no) no
Combined heat and power (yes / no) no
Preferred fuel Pellets
Maximum load kW 7.7 11.2 14.9
Partial load kW 2.3 2.3 4.4
Efficiency (in terms of gross calorific value) at maxi-
mum load %86.2 92.1 85.4 92.1 84.1 92.1
Efficiency (in terms of gross calorific value) at par-
tial load %82.4 91.9 82.4 91.9 81.6 91.9
Electrical power consumption at maximum load kW 0.061 0.063 0.095
Electrical power consumption at partial load kW 0.046 0.046 0.066
Electrical power consumption in ready mode kW 0.012 0.012 0.012
Energy efficiency class boiler A+ A++ A+ A++ A+ A++
Energy efficiency index boiler 112 125 113 126 112 127
Energy efficiency class "package-system" A+ A++ A+ A++ A+ A++
Energy efficiency index "package-system" 117 130 118 131 117 132
Seasonal space heating energy efficiency %75 84 75 85 75 85
Seasonal space heating emissions - dust mg/m³
(10% O2)<40 <40 <40 <40 <40 <40

Technical data Energy Labelling
11
Tab. 2-1: Product data according to EU Regulation 2015/
1187 and 2015/1189
Seasonal space heating emissions - OGC mg/m³
(10% O2)<20 <20 <20 <20 <20 <20
Seasonal space heating emissions - CO mg/m³
(10% O2)<500 <500 <500 <500 <500 <500
Seasonal space heating emissions - NOx mg/m³
(10% O2)<200 <200 <200 <200 <200 <200
PelletsUnit 7-15 kW
Unit
Model identification
PU7 PU7
BW
PU11 PU11
BW
PU15 PU15
BW

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Regulations, standards and guidelines
3 Regulations, standards and guidelines
Regulations
• Local building regulations
• Industrial and fire safety ordinances and
regulations
• State fire regulations
• In Germany, the EnEG (Energy Saving Act) with its
enacted EnEV ordinances for energy-saving
insulation and energy-saving building technologies
• In Germany, 1.BImSchV, initial ordinance for
enforcement of the federal pollution control act for
small-scale furnaces
• In Austria, Article 15 a, agreement on protective
measures regarding small-scale furnaces
• In Austria, Article 15 a, "Agreement on saving
energy"
• In Switzerland, VKF/AEAI fire safety regulations
25-03 and 106-03
Standards and guidelines
• ÖNORM H 5195-1 "Prevention of damage due to
corrosion and scaling in closed hot-water heating
systems".
The permissible water hardness for the heating
water can be determined from the table in Section
7.3 "Water hardness".
The requirements of ÖNORM H 5195-1 apply
as minimum requirements for the heating
water. If stricter country-specific regulations exist,
they are to be heeded.
• VDI 2035, "Prevention of damage due to corrosion
and scaling in hot-water heating systems with feed
temperatures up to 120 °C".
• EN 12828 "Heating systems in buildings –
planning for hot-water heating systems".
A safety valve (3 bar) and a safety temperature
limiter (100°C) are already installed in the boiler.
An 18-litre expansion tank is also integrated in the
boiler. For a larger expansion volume, an
additional expansion tank must be installed outside
the boiler by the contractor. The safety valve's
outlet must routed to a sewer connection.
• EN 12831 "Heating systems in buildings - method
for calculating standard heating load"
• EN 13384 "Flue systems - thermal and fluid-
dynamic calculation methods"
• EN 15287-1, flue systems for heating appliances
dependent on ambient air - planning, installation
and commissioning
• EN 15287-2, flue systems for heating appliances
with external air supply - planning, installation and
commissioning
• In Germany, DIN 18160 "Flue systems – planning
and design"
• In Austria, ÖNORM H 5170 "Heating systems –
construction and fire safety requirements".

CE-Conformity
13
4 CE-Conformity
CE declaration of conformity
We hereby declare that the product in its standard design as stated here corresponds to the above provisions. The
technical documentation for this product is administered by ETA Heiztechnik GmbH.
Manufacturer: ETA Heiztechnik GmbH
4716 Hofkirchen an der Trattnach, Gewerbepark 1, Austria
Product: Pellet Heating Boiler
Types: ETA PelletsUnit 7-15 kW
EU Directives:
2014/30/EU Directive relating to electromagnetic compatibility (EMC Directive)
2006/42/EC Directive on machinery (Machinery Directive)
2014/35/EU Directive relating to electrical equipment designed for use within certain voltage limits
(Low Voltage Directive)
2011/65/EU Directive on the restriction of the use of certain hazardous substances in electrical and
electronic equipment (RoHS 2 guideline)
Applied standards:
EN-303-5:2012 Heating boilers -
Part 5: Heating boilers for solid fuels, manually and automatically stoked, nominal heat
output of up to 500 kW - Terminology, requirements, testing and marking
EN ISO 12100:2011 Safety of machinery -
General principles for design - risk assessment and risk reduction
EN 60335-1:2012 Household and similar electrical appliances - Safety
Part 1: General requirements
EN 60335-2-102:2016 Safety of household and similar electrical appliances -
Part 2-102: Particular requirements for gas, oil and solid-fuel burning appliances having
electrical connections
IEC 61000-6 1/2:2005 Electromagnetic compatibility (EMC):
Generic standards - Immunity for residential, commercial and light-industrial environments
(1) and industrial environments (2)
IEC 61000-6 3/4:2011
+ A1:2011
Electromagnetic compatibility (EMC):
Generic standards - Emission standard for residential, commercial and light-industrial en-
vironments (3) and industrial environments (4)
Applied National Standards:
DIN 4702 Heating boilers, Part 1 and 4
Hofkirchen, 31/10/2018 Ing. Johann Eibelhuber
Quality assurance
DI Ferdinand Tischler
Management

14 www.eta.co.at
Boiler room
5 Boiler room
Installation of the boiler
The boiler may only be installed in dry surroundings.
The permitted ambient temperatures are between 5
and 30 °C.
The boiler may only be installed on a flat, non-
combustible surface. The distance of flammable
materials in the immediate vicinity of the boiler must be
heeded in accordance with national regulations.
Requirements for the boiler room
Boiler rooms must be built with fire-resistant F90
(EI90) walls and ceilings; in Switzerland El30 up to 70
kW and EI60 over 70 kW.
An escape door to a corridor or to the outside is
required. The door F30 (El30) must open in the
direction of escape and be self-closing with a tight
seal. Boiler room doors that open onto escape routes
must be EI90 (F90).
The boiler room must feature air inlet and outlet vents
with minimum diameters for the boiler.
To prevent flue gases from escaping, it must be
ensured that negative-pressure does not occur in the
boiler room. Building installations, such as suction for
the ventilation system or installed compressors, for
example, are thus not permissible.
Installation room for smaller boilers
For small boilers, a room with a sufficient air supply is
adequate. The area immediately surrounding the
boiler must be non-flammable.
In Germany, for up to 35 kW rated output, either at
least one door to the outside or one window that can
be opened (rooms with connection to outside), and a
room volume of at least 4 m³ per kW of boiler output, is
required. The room volume may also include other
rooms connected via air inlets in the doors.
There must be no heating appliances in the vicinity
of escape routes
Boilers may not be installed in stairwells, corridors or
rooms through which escape routes lead to the
outside.
Free minimum cross sections for the air intake
openings
The boiler requires air for combustion. That is why free
minimum cross sections are required in the boiler room
for the air intake openings. In Austria, these are
defined in ÖNORM H 5170, see the following table.
Tab. 5-1: free minimum cross sections
A protection grille at the air intake opening also
reduces the free cross section. Therefore, the air
inlet opening must be larger depending on the
protection grill. In air ducts through channels a
calculation by a specialist is required.
The values listed may vary from country-specific and
national regulations. Enquire about it at your authori-
ties. If no rules exist, we recommend the Austrian
minimum cross sections to use as a guide.
Too small-sized air inlet openings may result to
low pressure in the boiler room. This can lead to
a reduction of the boiler output, as well as to an exit of
flue gas in the boiler room.
Boilers that are operated with an external air
supply require no further supply air and outlet
openings in the boiler room.
Fuel storage
In Germany, up to 10,000 litres (6.5 tons) of pellets or
15,000 kg (20 steres) of split logs can be stored in the
room where the boiler is installed. For larger quantities,
a separate fire-resistant EI90 (F90) storeroom is
required.
Boiler
output
[kW]
Free minimum cross sections in cm²
Austria
(specifica-
tion from
ETA)
Germany Switzer-
land
20 400 150 206
30 400 150 309
40 400 150 412
50 400 150 515
60 400 170 618
70 400 190 721
90 400 230 927
110 440 270 1133
130 520 310 1339
180 720 410 1854
200 800 450 2060
350 1400 750 3605
500 2000 1050 5150

Boiler room
15
In Austria, no more than a week's supply of wood may
be stored next to the boiler. For pellets, a separate
storeroom EI90 (F90) with a EI30 (T30) door is
required. As a result of amendments to building laws,
up to 10 tonnes of pellets may be stored in the boiler
room in some states.
In Switzerland, up to 10 m³ of wood can be stored in
separate boiler rooms (EI60); the clearance from the
boiler must be 1 m. For larger quantities, a separate
storeroom (EI60 separated from the building) is
required; here wood may be stored together with straw
or hay.

16 www.eta.co.at
General information Safety
6 Safety
6.1 General information
Operation only by trained personnel
The product may be operated by trained adults only.
Training may be provided by the heating technician or
our customer service. Please read the associated doc-
umentation carefully in order to avoid errors during
operation and maintenance.
Persons who lack experience and knowledge as well
as children may not operate, clean, or maintain the
product.
Keep children away from the pellet store
Children must be kept away from the pellet store. It is
a good idea to lock the door to the pellet store. The
door handle on the inside of the pellet store must not
be removed. It must be possible to open the door from
the inside in an emergency.
Keep fire extinguishers in a clearly visible location
In Austria, the minimum requirement is an
ABC powder extinguisher with 6 kg. An AB foam extin-
guisher with 9 litres, which produces less damage
when used, is preferable. The fire extinguisher should
be kept outside the boiler room, visible and easily
accessible. Even if country-specific regulations do not
prescribe a fire extinguisher, we still recommend that
you keep one in-house.
Fig. 6-1: Fire extinguisher
Storage of ash
The ash must be kept in non-flammable containers
with covers for cooling. Never put hot ash into the
waste bin!
Emergency stop switch for the boiler
In Austria, heating systems installed in boiler rooms
must be equipped with an emergency stop switch. The
switch must be situated immediately outside the
access door and clearly marked. For boiler rooms that
are only accessible from outdoors, these switches may
also be within the boiler rooms, immediately next to the
access doors.
Fig. 6-2: Emergency stop switch
A single-pole emergency stop switch is integrated into
the boiler's safety chain. When actuated, it interrupts
the supply of combustion air and fuel. The pumps
continue running to cool the boiler.
6.2 Safety devices
Pump safety run, automatic heat dissipation at
overtemperature
If the boiler temperature exceeds 90°C (factory setting)
for any reason, the pump safety run will start. All
heating pumps and boiler pumps that are connected to
the boiler control system are switched on to dissipate
heat from the boiler.
This action prevents the boiler temperature from rising
further and triggering further safety devices such as
the safety temperature limiter.

Safety Safety devices
17
Heat dissipation is limited by the selected
maximum flow temperature in the heating circuits
and the target hot water temperature.
Safety shutdown by safety temperature limiter
For additional safety against boiler overheating, a
safety temperature limiter is built into the boiler. When
a boiler temperature of 100 °C (tolerance +0°/-6 °C) is
reached, the power supply to the draught fan and the
fuel intake is interrupted. When the boiler temperature
decreases back below 70°C, the safety temperature
limiter can be manually released for a restart of the
boiler.
Safety valve against overpressure
A safety valve with 3 bar opening pressure has already
been installed on the boiler at the factory. If solar or
other heat sources provide energy to the buffer
storage tank via a heat exchanger, a safety valve
(3 bar maximum) is also required on the buffer storage
tank.
Fig. 6-3: Safety valve
Normally an expansion tank that is too small or
defective, or blocked heating lines are the cause of the
safety valve activation.
DANGER!
Safety valve outlet
The safety valve outlet must be directed to the ground
in a pipe so nobody is endangered by hot water or
steam.
The safety valve outlet must be fed to the sewage
system (e.g. duct) via a clearly visible, open route
(siphon funnel), This will ensure that malfunctions,
especially a failure of the safety valve to close, can
be detected. If no connection is available to the
sewage system, the outlet must be directed to the
ground in a pipe.

18 www.eta.co.at
Chimney Information for installation
7 Information for installation
7.1 Chimney
7.1.1 Planning and layout
Required chimney diameter
Please note that in partial-load operation the exhaust temperature is lower and the large chimney diameters,
normally used for solid fuel, are no longer ideal. If the cross section is too large, the flue gas no longer safely rises
from the chimney opening and may flow along the roof and sink to the windows of the living quarters.
The flue gas connection on the boiler has two different diameters (see table). The flue pipe from boiler to
chimney must be executed as per the requirements in the table. A flue pipe with 2 m length and two 90° bends
was assumed for the calculation. For some boilers a smaller chimney dimension (corresponding to the minimum
diameter) can also be used. These values are listed in brackets.
Example: PU 7 with a 9 m chimney height and DN100 flue pipe => a chimney with 12 cm diameter is required. Al-
ternatively, a chimney with 10 cm diameter can be used.
No cross-sectional taper is permitted, such as a DN113 connection pipe in a chimney with a 10 cm diameter.
Diameter of the flue pipe from
boiler to chimney
Chimney height above the
boiler room floor
Required chimney diameter in cm
PU 7 PU 11
DN 100
DN 113 6 m 12 (10)
12
12 (10)
12
DN 100
DN 113 7 m 12 (10) 12
12 (10)
12
DN 100
DN 113 8 m 12 (10)
12
12 (10)
12
DN 100
DN 113 9 m 12 (10) 12
12 (10)
12
DN 100
DN 113 10 m 12 (10)
12
12 (10)
12
DN 100
DN 113 11 m 12 (10) 12
12 (10)
12
DN 100
DN 113 12 m 11 (10)
11
11 (10)
11
DN 100
DN 113 13 m 11 (10) 11
11 (10)
11
DN 100
DN 113 14 m 11 (10)
11
11 (10)
11
Diameter of the flue pipe from
boiler to chimney
Chimney height above the
boiler room floor
Required chimney diameter in cm
PU 15
DN 110
DN 113 6 m 13 (11)
13 (11)
DN 110
DN 113 7 m 13 (11) 13 (11)
DN 110
DN 113 8 m 12 (11)
12 (11)
DN 110
DN 113 9 m 12 (11) 12 (11)

Information for installation Chimney
19
Clarify with the chimney sweep
A specialist or a chimney sweep must inspect the
dimensions and suitability of existing chimneys
especially before boiler installation.
Every boiler must have its own chimney
The better the boiler and the chimney are matched, the
greater the energy with which the flue gas exits the
chimney, and therefore the certainty that it will rise up
into the air.
If the diameter is too large, the chimney will not be
heated sufficiently, and the exit velocity and
temperature will be too low. The flue gas then lacks the
energy to rise and, in extreme cases, the smoke can
sink down along the roof.
Chimneys with a diameter more than 50% greater than
needed must be renovated to reduce the diameter. If a
chimney is designed for use with two simultaneously
operating boilers, it may prove to be oversized for the
partial load from only one boiler. If there really is only
one chimney available, a buffer storage tank can help
avoid an overly small partial load.
DANGER!
Do not connect fan-assisted boilers and wood-
burning stoves to the same chimney
Although not expressly prohibited, connecting a fan-
assisted boiler and a wood-burning stove to the same
chimney is a dangerous combination. For every wood-
burning stove has an air intake. When the chimney is
cold, any fan-assisted boiler, whether it burns oil or
wood, will blow flue gas through this opening into the
living area. If the wood-burning stove's firebox door is
not closed and the boiler is defective at the same time,
acute carbon monoxide poisoning is even possible.
Wood-burning stoves require a considerably larger
chimney diameter, which cannot be heated by the fan-
assisted boiler. Cold flue gas does not rise from the
opening; it sinks and can reach living quarters through
open windows. Moreover, it may be possible to hear
the boiler's fan in the living quarters through the wood-
burning stove.
DANGER!
Do not connect fan-assisted boilers and gas
boilers to the same chimney
Most gas-fired boilers do not have a sealed air flap,
and if the fan-assisted boiler is started when the
chimney is cold, the flue gas is pushed through the gas
boiler into the boiler room. This is not greatly helped by
a flue gas damper in the flue pipe of the gas boiler, as
these dampers are not certain to seal well on closing.
In the case of atmospheric gas boilers, old fireclay
chimneys only stay dry due to the gas boiler's overflow
opening. The water from the flue gas condenses in the
chimney. During heating pauses, air flows through the
overflow opening and dries the chimney. If this air flow
is blocked by a flue gas damper, the moisture can
destroy an old fireclay chimney.
Obsolete regulations stipulate the wrong chimney
Laws and regulations demand a moisture-resistant
flue system for oil and gas and one that is resistant to
soot fires for solid fuels.
Wood is a solid fuel. However, in the lower output
range, the temperature of the flue gas can be below
100?, and condensates can be deposited in the
chimney. The chimney must therefore be moisture-
resistant, "contrary to regulations". Builders making a
chimney resistant to soot fires in compliance with the
law must then look on helplessly as the condensate
destroys the chimney wall.
Soot fires are possible in natural-draught boilers or
wood-burning stoves regulated by throttling the air
supply. When the wood fire is at full intensity and the
boiler temperature has been reached, a thermostat
closes the air flap. This stops combustion. However, as
DN 110
DN 113 10 m 12 (11)
12 (11)
DN 110
DN 113 11 m 12 (11) 12 (11)
DN 110
DN 113 12 m 12 (11)
12 (11)
DN 110
DN 113 13 m 12 (11) 12 (11)
DN 110
DN 113 14 m 12 (11)
12 (11)
Diameter of the flue pipe from
boiler to chimney
Chimney height above the
boiler room floor
Required chimney diameter in cm
PU 15

20 www.eta.co.at
Chimney Information for installation
the combustion chamber temperature doesn't fall, the
wood continues to gasify. Unburned wood gas
condenses to tar in the chimney, which can be ignited
by sparks from the fire.
With modern, lambda-controlled wood boilers, soot
fires of this kind are virtually impossible, as the control
system restricts wood gasification, not the air. In mod-
ern,lambda-controlled wood boilers, the control
system shuts down the fire by stopping the fuel supply,
without closing off the supply of air to the fire. This way,
there is no lack of air and no flammable tar in the
chimney. In addition, the low flue gas temperatures of
modern wood boilers also provide no ignition source
for a soot fire. Modern and properly maintained wood
boilers therefore pose no danger to chimneys from
soot fires.
Moisture-resistant W3G flue systems
Since 2005, W3G chimneys (classified according to
the German DIN 18160) exist that are resistant to both
moisture and soot fires. These chimneys are approved
for all fuels. Most of these W3G chimneys have
ceramic inner pipes, which have a significantly longer
service life than metal chimneys due to their acid
resistance.
Flue pipe to chimney preferably stainless steel
Due to the low flue gas temperatures, we recommend
that the flue gas pipe from the boiler to the chimney is
made of a stainless steel flue duct that is not sensitive
to moisture.
Provide a short, ascending flue pipe to the
chimney
The flue pipe from the boiler to the chimney must be
short, leakproof and ascending. "Attractive" right-angle
flue offsets with two or more bends are bad in a flue
pipe. The optimum to strive for is the shortest pipe from
the boiler to the chimney with a minimum of directional
changes. The flue pipe to the chimney must be
leakproof. Use heat-resistant silicone as a sealant for
unsealed sleeve pipes. Otherwise, you can expect
smoke to escape into the boiler room as the boiler
heats up. The flue pipe must always be laid so that it
ascends towards the chimney.
Long horizontal flue pipes to the chimney must have a
narrow cross-section and above-average insulation (>
50 mm). Provide enough cleaning openings in the flue
pipe. A flue pipe to the chimney with a large cross
section would reduce the calculated required chimney
cross section. However, ash deposits will form at low
flow speeds, and the theoretically calculated flue
draught will be lost again.
With a large chimney cross-section, a maximum
straight length of the flue pipe up to half the effective
chimney height is possible (calculation required).
Connection to the sewage system for the chimney
For the condensate in the chimney, a connection to the
sewage system (e.g. duct) with at least DN25 via a
siphon is required. The sewer pipe to which the con-
densation drain pipe is connected should be flushed
once a year.
Fig. 7-1: Condensate drain
For chimneys on the outer walls (made of
stainless steel, for example), frost-proof run-off
must be provided for the condensate water.
Insulate flue pipe to chimney
The flue pipe from the boiler to the chimney should be
insulated with at least 30 mm, preferably 50 mm, of
mineral wool to avoid temperature losses, which can
lead to a build-up of condensation.
Prevention of structure-borne noise
There should not be a fixed connection between the
flue pipe and the chimney to prevent structure-borne
noise as much as possible! Good flue gas systems are
acoustically insulated. If steel pipes are connected to a
fireclay chimney, ceramic fibre bandages have proven
effective at preventing structure-borne noise as well as
damage to the fireclay sleeve.