ZMM Haskovo PELLETHERM V.4 LT SERIES User manual

Pelletherm V.4 LT 1
MANUAL
FOR INSTALLATION, OPERATION AND MAINTENANCE OF A
SYSTEM, CONSISTING OF A HOT WATER PELLET BOILER
FROM SERIES “PELLETHERM V.4 LT” AND AN AUTOMATED
PELLET BURNER FROM SERIES “GP xx sc”
http:// www.greenecotherm.eu
EN 01

Pelletherm V.4 LT 2
Manufacturer
ZMM Haskovo PLC
Address
67 Saedinenie blvd., 6300 Haskovo, Bulgaria
Phone number
[phone]
Fax
[phone]
e
-
mail
[email protected]
home page
www.greenecotherm.eu
The manufacture company thanks you for your choice.
The manufacture company submits this manual to help the team that will install, adjust and
service the system - hot water pellet boiler and pellet burner, as well as to the customer that
will operate it.
The manufacturing company requires that the technicians, performing the above mentioned
procedures, had successfully passed the product technical training.
Edition: 11 July 2017.

Pelletherm V.4 LT 3
CONTENT
page.
1. USER SAFETY INFORMATION.................................................................................................................................. 4
2. SYSTEM ADVANTAGES: A HOT WATER PELLET BOILER FROM SERIES “PELLETHERM V.4 LT” AND AN
AUTOMATED PELLET BURNER FROM SERIES “GP XX SC”................................................................................................... 5
3. DESCRIPTION OF THE SYSTEM: A HOT WATER PELLET BOILER FROM SERIES “PELLETHERM V.4 LT” AND
AN AUTOMATED PELLET BURNER FROM SERIES “GP XX SC”............................................................................................. 7
3.1. CONSTRUCTION DESCRIPTION OF STEEL MADE HOT WATER PELLET BOILER FROM SERIES “PELLETHERM
V.4 LT”........................................................................................................................................................................................................ 7
3.2. MAIN INFORMATION ABOUT THE AUTOMATED PELLET BURNER FROM SERIES “GP XX SC”........................... 7
4. TECHNICAL DATA OF THE SYSTEM – A HOT WATER PELLET BOILER FROM SERIES “PELLETHERM V.4 LT”
AND AN AUTOMATED PELLET BURNER FROM SERIES "GP XX SC”. ................................................................................... 9
5. INSTALLATION OF THE SYSTEM. .......................................................................................................................... 21
5.1. REQUIREMENTS FOR INSTALLATION OF PELLET BURNER WITH SELF-CLEANNING “GP XX SC” TO A HOT
WATER BOILER “PELLETHERM V.4 LT”........................................................................................................................................... 21
5.2. GENERAL INFORMATION FOR CO-OPERATION OF THE SYSTEM: A HOT WATER PELLET BOILER
“PELLETHERM V.4 LT” AND PELLET BURNER FROM SERIES “GP XX SC”. ........................................................................... 21
5.3. INSTALLATION AND CONNECTION OF A HOT WATER PELLET BOILER “PELLETHERM V.4 LT” AND PELLET
BURNER “GP XX SC”. ........................................................................................................................................................................... 21
5.3.1. MAIN REQUIREMENTS FOR INSTALLATION OF A HOT WATER PELLET “PELLETHERM V.4 LT”. .................. 21
5.3.2. INSTALLATION OF THE SYSTEM......................................................................................................................... 22
5.3.3. POSITIONING OF THE SYSTEM FOR EASY MANUPULATION DURING MAINTENANCE AND SERVICING..... 22
5.3.4. POSITIONING OF THE SYSTEM IN COMPLIANCE WITH THE POWER SUPPLY NETWORK CONNECTION
REQUIREMENTS. .................................................................................................................................................................... 22
5.4. INSTALLATION OF THE SYSTEM’S MODULES. .................................................................................................. 22
5.4.1. CONNECTING TO THE CHIMNEY. ....................................................................................................................... 23
5.4.2. CONNECTING TO THE HEATING INSTALLATION............................................................................................... 23
5.4.3. INSTALLATION OF THE PELLET BURNER FROM SERIES “GP XX SC”. ............................................................ 23
5.4.4. INSTALLATION OF THE DIRECTING FIRE-CLAY BRICKS IN THE HEAT EXCHANGER UNIT’S COMBUSTION
CHAMBER.25
5.4.5. INSTALLATION/CHECK OF THE ASH CLEANING SECTION COVER CAP. ........................................................ 25
5.4.6. INSTALLATION OF THE COVER-FLAP IN FRONT OF THE FLUE GAS OUTLET................................................ 25
5.4.7. INSTALLATION OF THE BOILER’S HORIZONTAL COVER PANELS. .................................................................. 27
5.4.8. INSTALLATION OF THE COVER OVER THE BOILER’S CONVECTION TRACT.................................................. 27
5.4.9. INSTALLATION OF THE COVER OVER THE BOILER’S COMBUSTION CHAMBER. .......................................... 27
5.4.10. CONNECTING THE AUTOMATED PELLET BURNER FROM SERIES “GP XX SC” TO THE BOILER.................. 28
5.4.11. INSTALLATION OF THE FUEL TRANSPORT AUGER TO THE BURNER’S MAIN MODULE. .............................. 28
5.4.12. FILLING THE TRANSPORT AUGER WITH FUEL.................................................................................................. 29
5.4.13. CONNECTING THE SYSTEM TO THE POWER SUPPLY..................................................................................... 29
5.4.14. EXEMPLAR HYDRAULIC SCHEME. ..................................................................................................................... 29
6. INITIATION OF THE SYSTEM TO OPERATION....................................................................................................... 31
6.1. MAIN REQUIREMENTS ABOUT THE USED FUEL TYPE................................................................................................... 31
6.2. INITIATION OF THE SYSTEM, A HOT WATER BOILER FROM SERIES “PELLETHERM V.4 LT” AND A PELLET
BURNER FROM SERIES “GP XX SC”, TO OPERATION. ............................................................................................................... 31
6.2.1. INTERFACE PANEL FOR CONNECTION AND MANAGEMENT OF THE PELLET BURNER’S FROM SERIES “GP
XX SC” CONTROL PANEL. ...................................................................................................................................................... 31
6.2.2. POWER SUPPLYING OF A HOT WATER BOILER “PELLETHERM V.4 LT”. ........................................................ 34
6.2.3. SWITCHING ON THE SYSTEM. ............................................................................................................................ 34
6.2.4. BOILER’S OPERATIONAL PARAMETERS ADJUSTMENT. .................................................................................. 34
6.2.5. PELLET BURNER FROM SERIES ”GP XX SC” OPERATIONAL PARAMETERS FOR ADJUSTMENT................ 35
6.2.6. NOMINAL OPERATION MODE OF THE SYSTEM. ............................................................................................... 35
6.3. ADJUSTING THE SYSTEM’S HEATING OUTPUT. .............................................................................................................. 36
6.3.1. DECREASING THE HEATING OUTPUT................................................................................................................ 36
6.3.2. INCREASING THE HEATING OUTPUT................................................................................................................. 36
6.4. ADJUSTMENT OF THE BURNING PROCESS...................................................................................................................... 36
6.5. STOPPING THE SYSTEM’S OPERATION............................................................................................................................. 36
6.6. SHUTTING DOWN THE SYSTEM. .......................................................................................................................................... 37
6.7. EMERGENCY STOPPING OF THE SYSTEM........................................................................................................ 38
6.8. USER INTRODUCTION TO THE PROCEDURES FOR MAINTENANCE AND ADJUSTMENTS OF THE SYSTEM.. 38
6.9. SAFETY AND UNPREDICTED RISKS. ................................................................................................................................... 40
6.10. COMPLETION OF THE APPLIANCE WARRANTY CARD. .................................................................................... 40
6.11. ACTIONS AFTER EXPIRATION OF THE SYSTEM’S LIFE CYCLE................................................................................... 40
7. FAILURES AND TROUBLESHOOTING.................................................................................................................................. 41
8. WIRING DIAGRAM OF A BOILER FROM SERIES “PELLETHERM V.4 LT” IN COMBINATION WITH A PELLET
BURNER FROM SERIES “GP XX SC”...................................................................................................................................... 43
WARRANTY CONDITIONS ...................................................................................................................................................... 47

Pelletherm V.4 LT 4
1
. USER SAFETY INFORMATION.
The manual for installation, operation and maintenance of the system, consisting of a hot
water pellet boiler from series “Pelletherm V.4 LT” and an automated pellet burner from
series “GP xx sc”, is designated for end users and authorized servicing specialists.
The user must know that:
All activities regarding installation of the boiler and the pellet burner should be
performed only by an authorized installers, which have acquired legal rights by the
legal authorities;
All activities regarding the electrical installation must be performed only by electrical-
technicians;
The primary technical initialization to operation, including visual check of the entire
heating installation, adjustments and start of the boiler and the burner, must be
performed by a person that is authorized by the manufacturer.
Please observe the following conditions during installation, start, adjustment and initialization
to operation of the system – a hot water pellet boiler from series “Pelletherm V.4 LT” and an
automated pellet burner from series “GP xx sc”:
All legal provisions regarding safety;
All legal provisions regarding environment protection;
Provisions regarding installation, start and adjustment;
All harmonized provisions of the European Union, applicable for your country;
Please strictly follow the presented safety instructions, in order to avoid any risks or harms to
people, properties and environmental polluting.
Please pay attention to the following symbols in the present manual book:
Danger
This symbol warns the user about health risks.
Warning
This symbol warns the user about possible risks and harms to properties and
environment.
Information
This symbol presents text with additional information for the user.
The current manual book uses notation “Pelletherm V.4 LT”, including the hot
water boiler models “Pelletherm 18 V.4 LT”, “Pelletherm 25 V.4 LT” and
„Pelletherm 30 V.4 LT”. The pellet burner notation “GP xx sc” includes the
models “GP 20_18 sc”, “GP 25 sc” and “GP 32 sc”.
For your personal safety and before taking any actions regarding the
appliance installation and operation, it is highly recommended to read
carefully this manual book. Non-compliance to the instructions presented
below might lead to fatal consequences, for which the manufacturing
company will not be responsible.

Pelletherm V.4 LT 5
2. SYSTEM ADVANTAGES: A HOT WATER PELLET BOILER FROM SERIES
“PELLETHERM V.4 LT” AND AN AUTOMATED PELLET BURNER FROM SERIES
“GP XX SC”.
Type designation of boiler series: “Pelletherm V.4 LT”
Example
Pelletherm 18 V.4 LT
Boiler trade name
Nominal heating output*, kW
Boiler version
Boiler model
* Similar to other models of hot water boilers Pelletherm 25 V.4 LT and Pelletherm 30 V.4 LT.
The hot water pellet boilers from series “Pelletherm V.4 LT” are designated to utilize solid
fuels – biomass with pellet shape (all applicable fuel types are presented in the automated
pellet burner from series “GP xx sc” user manual). The boilers are with steel made, welded
construction. These boilers are used for heating in systems with local heat-supplying, as well
as for heating of domestic water. The boilers utilize wood pellets and other biomass,
described below, as the produced heat energy is adopted by the boiler’s body heat
exchanging surfaces and is then transferred to the heat-carrier filled in the system.
The hot water boiler’s delivery kit, from series “Pelletherm V.4 LT”, includes:
Heat exchanger unit – 1pc;
Automated pellet burner from series “GP xx sc” kit – 1pc;
Ash container – 1pc;
Bottom cover cap (between the second and the third flue pass sections) – 1pc;
Fire-clay bricks – 2pcs;
Flap – 1pc;
Door handle – 1pc;
Cleaning kit (scraper – 1pc, hook – 1pc);
Electrical connectors – for room thermostat – 1pc, for extraction fan – 1pc;
Power supply cable – 1pc;
Nut and washer M10 – 2pcs;
Cleaning arm cuff – 1pc;
Manual book for installation, operation and maintenance of the system – 1pc;
The automated pellet burner from series „GP xx sc” can utilize wood pellets with diameter Ø
6-8mm, from classes A1, A2 and B according to standard EN ISO 17225-2:2014, or
categories A, AB, B, BC and C according to the manufacture company’s classification.
The system consists of:
Hot water pellet boiler from series “Pelletherm V.4 LT”, presenting steel made heat
exchanger unit, used for warming of the heat-carrier;
Automated pellet burner from series “GP xx sc”.

Pelletherm V.4 LT 6
Advantages of the system:
The system is designated for biomass utilization, which makes it ecologically clean
and does not contribute to environment polluting and to planet’s global warming;
The system: a hot water pellet boiler from series “Pelletherm V.4 LT” and a pellet
burner from series “GP xx sc” is automated and provides operational comfort, close to
those of automatic hot water boilers (for example boilers utilizing liquids, gaseous or
electrical), which ensures its usage in systems with programmable room thermostat;
Automatic system operation, availability to regulate it through room thermostat
(weekly programmer), guaranteeing maximum heat comfort and fuel economy;
Automatic system adjustment, according to the transport auger’s fuel feed rate,
specific climate conditions and the fuel caloricity;
Independence by the used pellets quality, diameter Ø 6-8mm;
High efficiency;
Low harmful emissions;
Automatic fuel feeding from a hopper (attached to the delivery kit);
Compact design, ensuring easy installation and maintenance (during cleaning and
servicing);
Availability to warm domestic water;
Minimum operation costs.

Pelletherm V.4 LT 7
3. DESCRIPTION OF THE SYSTEM: A HOT WATER PELLET BOILER FROM
SERIES “PELLETHERM V.4 LT” AND AN AUTOMATED PELLET BURNER FROM
SERIES “GP XX SC”.
3.1. CONSTRUCTION DESCRIPTION OF STEEL MADE HOT WATER PELLET
BOILER FROM SERIES “PELLETHERM V.4 LT”.
The steel made hot water pellet boiler from series “Pelletherm V.4 LT” is designated for
heating of local installations, either built as systems with gravity water circulation or with
forced circulation through a pump. The heat exchanging unit is a module for automatic
pellets utilization and for heating of the circulations water. The cleaning of the ash residues
from the burning process is manual and can be performed through the front lower door of the
combustion chamber, by taking out the ash container and gathering its contain in proper
storage containers. The burning process organization and the heat exchange with the boiler
body surfaces ensure high efficiency of the appliance. The operation mode of the system: a
hot water pellet boiler from series “Pelletherm V.4 LT” and an automated pellet burner from
series “GP xx sc” depend on the chimney draught. The chimney draught depends on the
chimney condition, as well as on the flue gas temperature.
The hot water boiler’s heat exchanger construction from series “Pelletherm V.4 LT” complies
with the resistance requirements for such type of appliances: 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.
The hot water boiler consists of the following components/modules:
The main hot water boiler’s part is the boiler body (heat exchanger unit), as the
automated pellet burner from series “GP xx sc” is mounted on its side. The heat
exchanger is offered in 2 variants: the so called “left” and “right” mounting, i.e. the
automated pellet burner can be mounted either on the boiler’s body left side or on its
right side;
The heat exchanging unit is with steel made, welded construction. The combustion
chamber is formed in its front lower part, as the ash container is positioned under it.
The heat exchanger is with compact size relative to its heating output, because it has
3 pass construction providing high efficiency and optimal heat exchange;
The fire-clay bricks, mounted in the combustion chamber, provide optimal burning
process and help for complete fuel utilization;
The ash-tray is positioned at the bottom of the combustion chamber. The ash
residues are gathered there, as it provides simplified conditions for cleaning of the
appliance;
The water inlet and outlet muffs are positioned at the boiler’s rear side, with inner
thread G1½” and are used for connection to the heating system;
The flue outlet (with external diameter Φ149 mm) is centrally positioned in the rear
upper side of the hot water boiler and is used for extraction of the flue gasses to a
chimney;
The steel made heat exchanging unit, its cover and doors are isolated with mineral
wool, which limits the loses of heat to the environment;
The outside decoration cover panels are made of steel plates and are painted with
quality color coating.
3.2. MAIN INFORMATION ABOUT THE AUTOMATED PELLET BURNER FROM
SERIES “GP XX SC”
The automated pellet burner from series “GP xx sc” has to be mounted horizontally on the
side (“left” or “right” mounting) of a hot water pellet boiler from series “Pelletherm V.4 LT” and
is a separate (standalone) module from the system.

Pelletherm V.4 LT 8
The automated modulating pellet burner from series “GP xx sc” is independent module for
utilization of wood pellets and can be mounted to other hot water boilers (utilizing solid fuel)
or other appliances.
The pellet burner from series “GP xx sc” delivery kit includes:
Main module – 1pc;
Fuel feeding auger – 1pc;
Flexible pipe – 1pc, with locking brackets – 2pcs;
Manual book for installation, operation and maintenance of a pellet burner from series
“GP xx sc” – 1pc.
The pellet burner is equipped with:
System for automatic fuel ignition;
System for automatic fuel feeding to the combustion chamber;
System for automatic cleaning of the combustion chamber;
Security system, which blocks the burner in case the fuel feeding pipe has been
overheated, resulting from emergency situations;
Photo sensor for dynamic control of the burning process;
System for modulation of the firing air flow rate during the process of initial fuel
ignition;
System for modulation of its operation mode, providing optimal operation modes and
low fuel consumption;
Availability to perform final combustion followed by blowing through a defined period
of time, for cleaning purposes and for new automatic restart.
Updated and detailed information about the automated pellet burner from
series “GP xx sc”, regarding its construction and technical parameters, is
presented in its operation manual book.
An outer view of the system, consisting of a hot water pellet boiler from series “Pelletherm
V.4 LT”, an automated pellet burner from series “GP xx sc” and a pellet hopper, is presented
on Figure 3.1.
Figure 3.1. Outer view of the system – hot water pellet boiler and automated pellet burner.

Pelletherm V.4 LT 9
4. TECHNICAL DATA OF THE SYSTEM – A HOT WATER PELLET BOILER FROM
SERIES “PELLETHERM V.4 LT” AND AN AUTOMATED PELLET BURNER FROM
SERIES "GP XX SC”.
Technical parameters of the system, consisting of a hot water pellet boiler from series
“Pelletherm V.4 LT” and an automated pellet burner from series “GP xx sc”, are presented in
Table 4.1.
Table 4.1. Technical parameters of a system – a hot water pellet boiler and an automated
pellet burner.
PARAMETER DIMENSION VALUE
Hot water pellet boiler model - Pelletherm
18 V.4 LT
Pelletherm
25 V.4 LT
Pelletherm
30 V.4 LT
Pellet burner model - GP 20_18
sc
GP 25 sc GP 32 sc
Nominal heating output of the
system kW 18 25 30
Heating output adjustment range kW 7 - 18 7 – 25 10 - 30
Used fuel type Wood pellets
Pellets category according to
standard EN ISO 17225-2:2014 A1, A2, B
Pellets category (according to the
burner’s manufacture company
categorization)
A, AB, B, BC, C
Mass flow of flue gases* g/s 10.8
Energy efficiency class according
to regulation
(ЕU) 2015/1187
-
Efficiency at nominal heating
output mode ℅92 92 92
CO emissions in the flue gases
(0°C, 1013 mbar) at 10% О
2
mg/m
3
163.0
Dust emissions in the flue gases
(0°C, 1013 mbar) at 10% О
2
mg/m
3
14.1
OGC emissions in the flue gases
(0°C, 1013 mbar) at 10% О
2
mg/m
3
12.8
Boiler class according to standard
EN 303-5:2012 - 5
Flue gas temperature at nominal
heating output mode ºC 135-155 157-177 153-173
Residues after complete fuel
burning Ash The quantity depends on the pellets ash contain
* The data specified are calculating.
The pellet boiler from series “Pelletherm V.4 LT” is manufactured in two
variants for mounting of the pellet burner – the so called “left mounting” (i.e. the
burner is mounted on the boiler’s left side, when looking in front) and “right
mounting” (i.e. the burner is mounted on the boiler’s right side, when looking in
front of the boiler).
The automated pellet burner from series “GP xx sc” is designated for utilization of
wood pellets with classes A1, A2 and B, according to standard EN ISO 17225-
2:2014, or categories A, AB, B, BC and C according to the manufacture
company’s classification

Pelletherm V.4 LT 10
The dimensions and additional technical parameters of the system – hot water pellet boiler
from series “Pelletherm V.4 LT” and automated pellet burner from series “GP xx sc”, are
presented on Figure 4.1 and in Table 4.2.
Figure 4.1. Dimensions of the system hot water pellet boiler and automated pellet burner.
Table 4.2. Dimensions and additional technical parameters of the system hot water pellet
boiler and automated pellet burner.
PARAMETER DIMENSION VALUE
Hot water pellet boiler model - Pelletherm
18 V.4 LT
Pelletherm
25 V.4 LT
Pelletherm
30 V.4 LT
Automated pellet burner model -
GP 20_18 sc GP 25 sc GP 32 sc
Boiler weight kg 342 342 362
Boiler water volume l 50 50 60
System overall dimensions: B 546
1080
780
1250
546 546 546
W 1080 1080
1080
D 780 780 780
H 1250 1330 1330
Boiler’s operational water
overpressure MPa 0.25
Boiler’s tested overpressure MPa 0.40
Recommended operational water
temperature in the boiler ºC 80
Minimum boiler inlet water
temperature ºC 60
Chimney draught Pa 17
Connection
lines
Inlet/Outlet water G 1½”
Flue outlet
diameter mm 149
System power supply - L1, N, PE, 50Hz; 230VAC;
System electrical output W <100
+1100
(+ at ignition)
System electrical protection - IP20
If the chimney draught operation value is below the recommended values,
presented in the above table, it is necessary to install additional extraction fan
module.

Pelletherm V.4 LT 11
The technical parameters of hot water solid fuel boilers series Pelletherm V.4 LT according to
the delegated Regulation (EU) 2015/1187 are presented in Table 4.3.
Table 4.3 Technical parameters of hot water solid fuel boilers series Pelletherm V.4 LT
according to the delegated Regulation (EU) 2015/1187.
Model identifier: Hot water pellet boiler Pelletherm 18V.4 LT.
Stoking mode: Automatic: it is recommended that the boiler be operated with a hot water storag e
tank of a volume of at least 360 litre (**)
Condensing boiler: no
Solid fuel cogeneration boiler: no
Combination boiler: no
Fuel Preferred
fuel (only one):
Other suitable
fuel(s):
Log wood, moisture content ≤25 % no no
Chipped wood, moisture content 15-35 % no no
Chipped wood, moisture content > 35 % no no
Compressed wood in the form of pellets or briquettes yes no
Sawdust, moisture content ≤50 % no no
Other woody biomass no no
Non-woody biomass no no
Bituminous coal no no
Brown coal (including briquettes) no no
Coke no no
Anthracite no no
Blended fossil fuel briquettes no no
Other fossil fuel no no
Blended biomass (30-70 %) and fossil fuel briquettes no no
Other blend of biomass and fossil fuel no no
Characteristics when operating with the preferred fuel:
Seasonal space heating energy efficiency ƞ
s
[%]: 87
Energy efficiency index EEI: А+

Pelletherm V.4 LT 12
Item Symbol Value Unit Item Symbol
Value Unit
Useful heat output Useful efficiecny
At rated heat
output
P
n
(***) 18 kW
At rated heat
output
ƞ
n
93,6 %
At [30 %/50%] of
rated heat
output, if
applicable
Р
р
10 kW
At [30 %/50%]
of rated heat
output, if
applicable
ƞ
p
94,0 %
For solid fuel cogeneration boilers: Electrical
efficiency
Auxiliary electricity consumption
At rated heat
output
Ƞ
el,n
- %
At rated heat
output
el
max
0,156 kW
At [30 %/50%]
of rated heat
output, if
applicable
el
min
0,134 kW
Of incorporated
secondary emission
abatement equipment,
if applicable
- kW
In standby
mode
P
SB
0,013 kW
Contact details Ekoterm Proekt EAD / ZMM Haskovo AD
6300, Haskovo
67 Saedinenie Blvd.
(*) Tank volume = 45 × Pr × (1 – 2,7/Pr) or 300 litres whichever is higher, with Pr indicated in kW
(**) Tank volume = 20 × Pr with Pr indicated in kW
(***) For the preferred fuel Pn equals Pr

Pelletherm V.4 LT 13
Model identifier: Hot water pellet boiler Pelletherm 25V.4 LT.
Stoking mode: Automatic: it is recommended that the boiler be operated with a hot water storag e
tank of a volume of at least 500 litre (**)
Condensing boiler: no
Solid fuel cogeneration boiler: no
Combination boiler: no
Fuel Preferred
fuel (only one):
Other suitable
fuel(s)
Log wood, moisture content ≤25 % no no
Chipped wood, moisture content 15-35 % no no
Chipped wood, moisture content > 35 % no no
Compressed wood in the form of pellets or briquettes yes no
Sawdust, moisture content ≤50 % no no
Other woody biomass no no
Non-woody biomass no no
Bituminous coal no no
Brown coal (including briquettes) no no
Coke no no
Anthracite no no
Blended fossil fuel briquettes no no
Other fossil fuel no no
Blended biomass (30-70 %) and fossil fuel briquettes no no
Other blend of biomass and fossil fuel no no
Characteristics when operating with the preferred fuel:
Seasonal space heating energy efficiency ƞ
s
[%]: 89
Energy efficiency index EEI: А+

Pelletherm V.4 LT 14
Item Symbol Value Unit Item Symbol
Value Unit
Useful heat output Useful efficiecny
At rated heat
output
P
n
(***) 25 kW
At rated heat
output
ƞ
n
93,9 %
At [30 %/50%] of
rated heat
output, if
applicable
Р
р
18 kW
At [30 %/50%]
of rated heat
output, if
applicable
ƞ
p
94,1 %
For solid fuel cogeneration boilers: Electrical
efficiency
Auxiliary electricity consumption
At rated heat
output
Ƞ
el,n
- %
At rated heat
output
el
max
0,156 kW
At [30 %/50%]
of rated heat
output, if
applicable
el
min
0,134 kW
Of incorporated
secondary emission
abatement equipment,
if applicable
- kW
In standby
mode
P
SB
0,013 kW
Contact details Ekoterm Proekt EAD / ZMM Haskovo AD
6300, Haskovo
67 Saedinenie Blvd.
(*) Tank volume = 45 × Pr × (1 – 2,7/Pr) or 300 litres whichever is higher, with Pr indicated in kW
(**) Tank volume = 20 × Pr with Pr indicated in kW
(***) For the preferred fuel Pn equals Pr

Pelletherm V.4 LT 15
Model identifier: Hot water pellet boiler Pelletherm 30V.4 LT.
Stoking mode: Automatic: it is recommended that the boiler be operated with a hot water storag e
tank of a volume of at least 600 litre (**)
Condensing boiler: no
Solid fuel cogeneration boiler: no
Combination boiler: no
Fuel Preferred
fuel (only one):
Other suitable
fuel(s):
Log wood, moisture content ≤25 % no no
Chipped wood, moisture content 15-35 % no no
Chipped wood, moisture content > 35 % no no
Compressed wood in the form of pellets or briquettes yes no
Sawdust, moisture content ≤50 % no no
Other woody biomass no no
Non-woody biomass no no
Bituminous coal no no
Brown coal (including briquettes) no no
Coke no no
Anthracite no no
Blended fossil fuel briquettes no no
Other fossil fuel no no
Blended biomass (30-70 %) and fossil fuel briquettes no no
Other blend of biomass and fossil fuel no no
Characteristics when operating with the preferred fuel:
Seasonal space heating energy efficiency ƞ
s
[%]: 86
Energy efficiency index EEI: А+

Pelletherm V.4 LT 16
Item Symbol Value Unit Item Symbol
Value Unit
Useful heat output Useful efficiecny
At rated heat
output
P
n
(***) 30 kW
At rated heat
output
ƞ
n
91,7 %
At [30 %/50%] of
rated heat
output, if
applicable
Р
р
20 kW
At [30 %/50%]
of rated heat
output, if
applicable
ƞ
p
90,4 %
For solid fuel cogeneration boilers: Electrical
efficiency
Auxiliary electricity consumption
At rated heat
output
Ƞ
el,n
- %
At rated heat
output
el
max
0,156 kW
At [30 %/50%]
of rated heat
output, if
applicable
el
min
0,134 kW
Of incorporated
secondary emission
abatement equipment,
if applicable
- -
In standby
mode
P
SB
0,013 kW
Contact details Ekoterm Proekt EAD / ZMM Haskovo AD
6300, Haskovo
67 Saedinenie Blvd.
(*) Tank volume = 45 × Pr × (1 – 2,7/Pr) or 300 litres whichever is higher, with Pr indicated in kW
(**) Tank volume = 20 × Pr with Pr indicated in kW
(***) For the preferred fuel Pn equals Pr
The next figures present the overall and connection sizes/dimensions, as well as outer views,
of the system – a hot water pellet boiler from series “Pelletherm V.4 LT” and a pellet burner
from series “GP xx sc” (the presented model is with left mounting of the burner).

Pelletherm V.4 LT 17
Figure 4.2. System overall sizes – front view.
Figure 4.3. Overall and connection sizes/dimensions of a hot water pellet boiler from series
“Pelletherm V.4 LT” – pellet burner mounting flange side view.

Pelletherm V.4 LT 18
Figure 4.4. Overall and connection sizes/dimensions of the system – rear view.
Figure 4.5. Overall and connection sizes/dimensions of the system – top view.

Pelletherm V.4 LT 19
Figure 4.6. View of the system – a hot water pellet boiler from series “Pelletherm V.4 LT” and
a pellet burner from series “GP xx sc”.
Boiler’s convections
tract cover
Boiler’s combustion
chamber cover
Boiler’s combustion
chamber cover panel
Pellet burner mounting
flange
Boiler’s top cover panel
Ash container door
Pellet burner

Pelletherm V.4 LT 20
Figure 4.7. Cross section view of a hot water boiler from series “Pelletherm V.4 LT” with
presented flue gas direction and its construction main modules.
The wood pellets categorization, depending on their physical properties,
according to the methodic developed by the manufacturing company and
according to standard EN ISO 17225-2:2014, is presented in the automated
pellet burner from series “GP xx sc” manual book.
Ash container
Boiler’s combustion chamber door
Boiler’s combustion chamber
„First pass” of flue gasses inside the
boiler
„Second pass” of flue gasses inside
the boiler
„Third pass” of flue gasses inside the
boiler
Flue gas outlet to chimney
Boiler top cover panel
Bottom section closing cover cap,
separating the volume between the
convection tract and the boiler’s
combustion chamber
Ash container door