elco Combi 24 User manual

1
Operating Manual
for authorized technicians only
THISION S PLUS / Combi
www.elco.net 9B.51.01.01 / 07.16

2
Table of contents
Table of contents .................................................................... 2
Safety regulations General regulations..................................... 3
Intended use ............................................... 3
Standards and regulations .......................... 3
Construction Product description / Functional
description - THISION S PLUS ................. 4-5
Product description / Functional
description - THISION S PLUS Combi...... 6-7
Technical data Technical data ............................................. 8-9
ERP data ..................................................... 10
Dimensions.................................................. 11
Delivery scope Standard version ........................................ 12
Accessories ................................................ 12
Installation Boiler transport............................................ 13
Disassembly of panelling............................. 13
Installation ................................................... 14
Connections ................................................ 14
Hydraulic circulation pumps ....................... 15-16
Hydraulic system separation ...................... 18-19
Heating water quality................................... 20-21
Condensate connection............................... 22
  Air-/uegasducts...................................... 23-24
Electrical connection ................................... 25
Electrical diagram - boiler............................ 26
Electrical diagram - accessories.................. 27
Operation Operating elements .................................... 28
Main functions of control panel.................... 29
Parameters End user / technician................................... 30-50
Commissioning Gas supply ................................................. 51
Condensate connection .............................. 51
Flue gas and air supply connections .......... 51
Water pressure............................................ 51
Preparations for 1st use ............................. 52
Waste gas volume and regulation ............... 53-55
Maintenance Repair works ............................................... 56
Decommissioning ....................................... 56
Inspection interval ...................................... 56
Maintenance interval ................................... 56
Maintenance details .................................... 57
Removal of panelling................................... 57
Air box ......................................................... 57
Fan unit and burner cassette....................... 57
Heat exchanger........................................... 58
Ignition electrode......................................... 59
Siphon and condensate tray........................ 60
Inspection overview .................................... 61
Maintenance overview ................................ 62
Malfunctions .................................................................... 63-64
Sensor parameters .................................................................... 65
System water additives .................................................................... 66
Conformity declaration .................................................................... 67

3
Safety regulations
General regulations
Intended use
Standards and regulations
General regulations
This document contains important
information with regard to safety and
reliability of the installation, its com-
missioning and the operation of the
THISION S PLUS boiler. All described
activities must be carried out exclusive-
ly by authorized technicians.
Only OEM parts of the boiler manufac-
turer may be used; in contrary cases,
our warranty and guarantee provisions
are excluded.
Intended use
The THISION S PLUS is a condensing
and modulating gas boiler, which is
suspended from walls and is delivered
with a pre-mix burner, either with or
without integrated warm water heating.
The maximum target temperature of
the boiler is 85°C.
Standards and regulations
All applicable standards (both
European and national) must be
observed during the installation and
operation of the THISION S PLUS
boiler, including:
- Local building regulations, with
regard to the installation of heating
facilities and waste gas exhaust
systems;
- Regulations about a connection to
the electrical utility network (mains);
- Regulations of the local gas utility;
- Standards and regulations
concerning safety facilities for
heating systems;
- Additional local laws/regulations,
which are applicable to the
installation and operation of heating
systems.
- See the chapter “Commissioning”,
for those regulations applicable
to heating water and warm water
quality.
The THISION S PLUS boiler is
CE-certied and conforms to the
following European directives and
standards:
- 92/42/EEC(E󰀩ciencyofhot
water heating systems)
- 2009 / 142 / EEC (Gas consuming
facilities)
- 2006 / 95 / EEC (Safety of electrical
operating resources)
- 2004 / 108 / EEC (EMC
compatibility)
- EN483(Requirementsforgas-red
systems up to 70 kW)
- EN 15420 (Requirements for gas-
redsystems–typeCboiler70kW
–1000kW)
- EN 15417 (Special requirements for
condensinggas-redboilers70kW
–1000kW)
- EN 50165
Electrical equipment for non-electric
appliances, intended for household
use and similar purposes - safety
requirements
- EN 15502-1 (Requirements for
gas-redsystems–Part1:General
requirements and tests)
- EN55014-1(2000)EMC–
Requirements for household
appliances, electrical tools and
similarequipment–Part1:
Emissions
- EN55014-2(1997)EMC–
Requirements for household
appliances, electrical tools and
similarequipment–Part2:Safety-
product family standard
- EN 61000-3-2 (2000)
Electromagnetic compatibility
(EMC) - Part 3-2: Framework
conditions - framework conditions
forcurrentuctuations(current
drain 16 A per phase)
- EN 61000-3-3 (2001)
Electromagnetic compatibility
(EMC) - Part 3-3: Framework
conditionsforvoltageuctuations,
voltagelossandickerinpublic
low-voltage networks, for equipment
with a nominal 16 A current per
phase, which are not subject to any
special connection regulations.
- EN 60335-1 (2002) Household
and similar electrical equipment
- Safety - Part 1: General
requirements
- EN 60335-2-102 (2006) Household
and similar electrical equipment
- Safety - Part 1: Special
requirements for gas, oil and solid
fuel-redequipmentwithelectrical
connections
In addition to this, the following
national standards must be
observed:
UK:
- Gas Safety Installation & Use
Regulations
- BS 5440-1:2008
- BS 5440-2:2009
- BS 6798:2014
The facility may only be operated by
authorized persons, who have been
trained with regard to the functions
and the use of the system. Inexpert
use can damage the equipment or
the connected system.
The equipment may not be used
by children, by persons with a
hindrance of bodily, mental or
sensory capacities, or which
insu󰀩cient experience and know-
how, unless they are supervised
or have received corresponding
instructions.
It must be ensured that children
cannot play with the equipment.

4
Product description
THISION S PLUS
Product description
The THISION S PLUS is a condensing
and modulating gas boiler with a pre-
mix burner, which is attached to a wall.
It is characterized by the following
features:
- A large modulation range that
guarantees a long burner service
life, while minimizing standby
losses, start-up emissions and
material wear-and-tear.
- Flue gas temperature below 80°C
- Flue gas temperature fuse
- Also suitable for room sealed
conditions
- Control panel with all operational
elements
- Microprocessor, with multi-
functional display
- Automated ignition, with repetition
and ionization monitoring
- Water pressure monitoring
- Analog manometer
- Energy-saving pump
- Installed safety valve
- Stainless steel heat exchanger with
smooth tube condenser
- Very maintenance-friendly
- Weather-compensated control with
room unit/remote control QAA 55,
or with room unit/remote control
QAA 75/78 (accessory)
- Modern metal panelling, stove-
enamelled
Functional description
Thecontrolunitmodiestheheating
performance to the current heating
requirements, by changing the
default values of the fan rotating
speed.Inthisregard,theboilerow
temperature is continually measured
via a sensor. In case of a deviation of
the actual temperature from the target
temperature, the control unit reacts
immediately and adjusts the RPM
of the Fan, and with that the boiler
performance via the gas armature. A
deviation can be due to:
- A changed default value of the
boiler temperature, via the LMS 14
heating control unit
- A change on the outdoor
temperature
- Request for warm water
- Changed heating curve
- Changedvolumeowintheheating
system (due to thermostat valves
and mixer)
By means of the integration of the
individual components in a system,
and within the control range of the
equipment, it is ensured that the boiler
performance always corresponds to the
actual heating requirements.
Delivery scope
The boiler, which has been assembled
at the factory and is ready to use,
is delivered in cardboard packaging.
The following is contained in the
delivery scope of the THISION S
PLUS:
- Modulatinghighe󰀩ciencygas-red
boiler, 4.5 to 54 kW
- Installed safety valve
- Installed 3-way valve*
- Outdoor sensor QAC 34
- DHW sensor QAZ 36
- Room unit QAA 55
* Only for THISION S PLUS 13, 19
and 24. Available for the types
THISION S PLUS 34, 35L, 46 and
54 as an optional accessory.
Legend:
1 Gas connection
2 Gas armature
3 Gas burner
4 Flue gas connection
5 Boilerowconnection
6 Boiler return connection
7 3-way valve*
8 Fan 230 V
9 Heat exchanger
10 Control panel with heating manager
11 Boiler pump
12 Expansion vessel connection
13 Analog manometer (not visible
here)
14 Cylinderoutow
15 Flue gas non-return valve
1
2
4
8
3
9
10
5
6
14
12
7
11
13
15

5
Product description
THISION S PLUS hydraulic circuit diagram
1
2
3
4
5
6
7
8
9
10
11
12
14
g v r c a s
13
Legend:
1 Flue gas non-return valve
2 Modulating Fan
3 Gas valve
4 Ionization and ignition electrode
5 Primary heat exchanger
6 BoilerowsensorNTC1
7 Boiler return sensor NTC2
8 Water pressure sensor P1
9 High-e󰀩ciencypump
10 Siphon
11 Heater dirt trap
12 3-way valve
(Only for THISION S PLUS 13,
19 and 24. Available for the types
THISION S PLUS 34, 35L, 46 and
54 as an optional accessory.)
13 Automatic ventilator
14 3 bar safety valve
g Gas connection
v Boilerowconnection
r Boiler return connection
c Condensate drain
a Expansion vessel connection (only
types 13, 19 and 24. This is only
available for the types 34, 46 and
54, when a 3-way valve has been
installed as an accessory)
s Cylinder return connection
(Only types 13, 19 and 24. This is
only available for the types 34, 35L,
46 and 54, when a 3-way valve has
been installed as an accessory)

6
Product description
THISION S PLUS Combi
Product description
The THISION S PLUS Combi is a
condensing and modulating gas
boiler with a pre-mix burner, which is
attached to a wall. It is characterized by
the following features:
- A large modulation range that
guarantees a long burner service
life, while minimizing standby
losses, start-up emissions and
material wear-and-tear.
- Flue gas temperature below 80°C
- Flue gas temperature fuse
- Also suitable for operation
independent of room air
- Control panel with all operational
elements
- Microprocessor with a multi-function
display
- Automated ignition, with repetition
and ionization monitoring
- Water pressure monitoring
- Analog manometer
- Energy-saving pump
- Installed safety valve
- Stainless steel heat exchanger with
smooth tube condenser
- Very maintenance-friendly
- Weather-compensated control with
room unit/remote control QAA 55,
or with room unit/remote control
QAA 75/78 (accessory)
- Modern metal panelling, stove-
enamelled
Functional description
Thecontrolunitmodiestheheating
performance to the current heating
requirements of the heating system,
by changing the default values of the
Fan rotating speed. In this regard, the
boilerowtemperatureiscontinually
measured via a sensor. In case of a
deviation of the actual temperature
from the target temperature, the control
unit reacts immediately and adjusts the
RPM of the fan, and with that the boiler
performance via the gas armature. A
deviation can be due to:
- A changed default value of the
boiler temperature, via the LMS 14
heating control unit
- A change on the outdoor
temperature
- Request for warm water
- Changed heating curve
- Changedvolumeowintheheating
system (due to thermostat valves
and mixer)
By means of the integration of the
individual components in a system,
and within the control range of the
equipment, it is ensured that the boiler
performance always corresponds to the
actual heating requirements.
Delivery scope
- Modulating gas burner, with DHW
preparation in a circulation system
- Comfort DHW performance by
meansofanintegratedashtank
14 litres (Combi 24)
25 litres (Combi 34)
- DHW performance
13.4 l/min. (Combi 24)
16.6 l/min. (Combi 34)
at T 30 K, according to EN625
- Installed safety valve
- Outdoor sensor QAC 34
- Room unit/remote control QAA 55
Legend:
1 Gas connection
2 Gas armature
3 Gas burner
4 Flue gas connection
5 Boilerowconnection
6 Boiler return connection
7 Fan 230 V
8 Heat exchanger
9 Control panel with heating manager
10 Boiler pump
11 Expansion vessel connection
(Combi 34)
12 Expansion vessel (Combi 24)
13 3-way valve
14 DHW tank
15 Cold water connection
16 Warm water connection
17 Analog manometer (not visible
here)
18 Flue gas non-return valve
Illustration: THISION S PLUS Combi 24
1
2
4
7
3
8
9
5
6
11
15
16
17
10
14
13
12
18

7
Product description
THISION S PLUS Combi hydraulic circuit diagram
1
2
3
4
5
6
7
8
9
10
11
12
14
13
15
16
17
18
g v r c a k w
Legend:
1 Flue gas non-return valve
2 Modulating Fan
3 Gas valve
4 Ionization and ignition electrode
5 Primary heat exchanger
6 BoilerowsensorNTC1
7 Boiler return sensor NTC2
8 Water pressure sensor P1
9 High-e󰀩ciencypump
10 Siphon
11 Heater dirt trap
12 3-way valve
13 Automatic ventilator
14 3 bar safety valve
15 Reserve tank heat exchanger for
warm water
16 Warm water sensor NTC3
17 Mixing valve thermostat
18 Flow-through limiter
g Gas connection
v Boilerowconnection
r Boiler return connection
c Condensate drain
a Expansion vessel connection (C 34)
k Cold water connection
w Warm water connection
Illustration: THISION S PLUS Combi 34

8
Product description
Technical data for THISION S PLUS
Type THISION S PLUS 13 19 24 34 35L 46 54
Permit
Category
SVGW number
CE0063BQ3021
BE-I2E(S), I3P
Heat exchanger type OSS1 OSS1 OSS1 OSS2 OSS4 OSS4 OSS4
Output G20 Full load 80/60°C kW 13,9 18,2 22,1 33,6 34,2 44,9 52,9
40/30°C kW 14,4 19,7 23,9 36,3 37,0 48,7 57,3
Low load 80/60°C kW 3,5 3,5 3,5 4,9 8,8 8,8 8,8
40/30°C kW 3,9 3,9 3,9 5,3 9,8 9,8 9,8
G25 Full load 80/60°C kW 11,3 14,9 18,0 27,3 27,8 36,6 43,1
Low load 80/60°C kW 3,1 3,1 3,1 4,1 7,5 7,5 7,5
G31 Full load 80/60°C kW 13,9 18,2 22,1 33,6 34,2 44,9 52,9
40/30°C kW 14,9 19,4 23,6 35,9 36,6 48,2 56,7
Low load 80/60°C kW 9,9 9,9 9,9 15,8 31,7 31,7 31,7
40/30°C kW 11,0 11,0 11,0 17,6 35,2 35,2 35,2
Input G20 Full load kW 14,1 18,5 22,5 34,2 34,9 45,9 54,0
Low load kW 3,6 3,6 3,6 5 9 9 9
G25 Full load kW 11,5 15,2 18,4 27,9 28,4 37,3 44,0
Low load kW 3,2 3,2 3,2 4,2 7,5 7,5 7,5
G31 Full load kW 14,1 18,5 22,5 34,2 34,9 45,9 54,0
Low load kW 10 10 10 16 32,0 32,0 32,0
Boilere󰀩ciency Full load 80/60°C % 98,4 98,3 98,2 98,2 97,9 97,9 97,9
Low load 40/30°C % 109,7 109,7 109,7 109,1 109,3 109,3 109,3
Gas type Natural gas or propane gas
CO2natural gas min./max. Vol. % 8,8 / 9,2
CO2propane gas min./max. Vol. % 10,5
O2natural gas min./max. Vol. % 4,6 / 5,4
NOx annual emissions value (3%O2) mg/m314 20 22 22 16 16 21
CO annual emissions value (3%O2) mg/m317 15 13 11 28 29 24
Standby losses Tk 70°C W 42 42 42 55 89 89 89
Max.uegastemperature 80/60°C 68 68 68 69 70 70 70
Massowofuegas max. g/s 6,2 8,2 10,3 15,6 16,4 21,0 24,7
Overpressure at boiler output max. Pa 75 75 75 75 90 90 90
Water volume in heating circuit l 3,5 3,5 3,5 5 7 7 7
Weight kg 50 50 50 53 64 64 64
Gasowpressure-standard mbar 20
Gasow-pressuremin./max. mbar 17 / 25
Operating pressure of heating unit min./max. bar 1 / 3
Operating temperature of warm water max °C 65
Voltage/frequency min./max. Volt/Hz 230 / 50
Boiler power consumption W 70 75 79 93 88 125 143
Pump power consumption min./max. W 12 / 23 12 / 30 12 / 31 12 / 51 25 / 45 12 / 45 12 / 60
Width / depth / height mm 500 x 385 x 680 660 x 385 x 680
External thread of gas connection R 3/4” 3/4” 3/4” 3/4” 3/4” 3/4” 3/4”
Flow/return external thread R 1” 1” 1” 1” 1 1/4” 1 1/4” 1 1/4”
Flue gas connection PPS Diameter DN 80 80 80 80 80 80 80
Outdoor air connection Internal Ø mm 125 125 125 125 125 125 125
Condensate connection PVC External Ø mm 24 24 24 24 24 24 24
Product characteristics, for calculating the system consumption value according to
DIN V4701-10:
Nominal heat output Qn (kW) 13,9 18,2 22,1 33,6 34,2 44,9 52,9
E󰀩ciencylevelatnominalheatoutput η100%(%) 98,4 98,3 98,2 98,2 97,9 97,9 97,9
Partialloade󰀩ciencylevel η30%(%) 109,7 109,7 109,7 109,1 109,3 109,3 109,3
return temperature, when measuring at 30% partial load
e󰀩ciencylevel
T 30% (°C) 30 30 30 30 30 30 30
Standby heat loss q B,70 (%) 0,30 0,23 0,19 0,16 0,26 0,19 0,16
Auxiliary energy: Boiler incl. integrated heating circuit pump PHE (W) 70 75 79 93 88 125 143

9
Product description
Technical data for THISION S PLUS
Type THISION S PLUS Combi 24 Combi 34
Permit
Category
SVGW number
CE0063BQ3021
BE-I2E(S), I3P
Heat exchanger type OSS2 OSS2
Output G20 Full load 80/60°C kW 22,1 33,6
40/30°C kW 24,7 37,3
Low load 80/60°C kW 4,9 4,9
40/30°C kW 5,3 5,3
G25 Full load 80/60°C kW 18 27,3
Low load 80/60°C kW 4,1 4,1
G31 Full load 80/60°C kW 22,1 33,6
40/30°C kW 23,6 35,9
Low load 80/60°C kW 15,8 15,8
40/30°C kW 17,6 17,6
DHWow(accordingtoEN625) l/min. 10,7 13,3
Input G20 Full load kW 22,5 34,2
Low load kW 5 5
G25 Full load kW 18,4 27
Low load kW 4,2 4,2
G31 Full load kW 22,5 34,2
Low load kW 16 16
Boilere󰀩ciency Full load 80/60°C % 98,2 98,2
Low load 40/30°C % 109,7 109,1
Gas type Natural gas or propane gas
CO2natural gas min./max. Vol. % 8,8 / 9,2
CO2propane gas min./max. Vol. % 10,5
O2natural gas min./max. Vol. % 4,6 / 5,4
NOx annual emissions value (3%O2) mg/m315 11
CO annual emissions value (3%O2) mg/m315 22
Standby losses Tk 70°C W 60 60
Max.uegastemperature 80/60°C 68 69
Massowofuegas max. g/s 14,4 15,6
Overpressure at boiler output max. Pa 75 75
Water volume in heating circuit l 5 5
Water volume DHW circuit l 14 25
Weight kg 73 84
Gasowpressure-standard mbar 20
Gasow-pressuremin./max. mbar 17 / 25
Operating pressure of heating unit min./max. bar 1 / 3
DHW operating pressure min./max. bar 1 / 8
DHW operating temperature max °C 60
Content/pre-pressure of expansion vessel l / bar 12 / 1 -
Voltage/frequency min./max. Volt/Hz 230 / 50
Boiler power consumption W 77 98
Pump power consumption min./max. W 12 / 35 12 / 56
Width / depth / height mm 840 x 385 x 680
External thread of gas connection R 3/4” 3/4”
Flow/return external thread R 1” 1”
Flue gas connection PPS Diameter DN 80 80
Outdoor air connection Internal Ø mm 125 125
Condensate connection PVC External Ø mm 24 24
Product characteristics, for calculating the system consumption value according to DIN V4701-10:
Nominal heat output Qn (kW) 22,1 33,6
E󰀩ciencylevelatnominalheatoutput η100%(%) 98,2 98,2
Partialloade󰀩ciencylevel η30%(%) 109,7 109,1
returntemperature,whenmeasuringat30%partialloade󰀩ciencylevel T 30% (°C) 30 30
Standby heat loss q B,70 (%) 0,27 0,18
Auxiliary energy: Boiler incl. integrated heating circuit pump PHE (W) 77 98

10
Product description
ErP data for THISION S PLUS
Type THISION S PLUS 13 19 24 34 35L 46 54
ErP data according to 2010/30/EU
Seasonalroom-heatingenergye󰀩ciencyclass A A A A A A A
Nominal heat output Pn(kW) 14 18 22 34 34 45 53
Annual energy consumption QHE (GJ) 5 6 7 11 10 15 17
Seasonalroom-heatingenergye󰀩ciencyclass ηs(%) 94 94 94 94 94 94 94
Noise output level, inside LWA (dB) 39 43 46 50 50 51 51
Temperature regulator QAA 55 + AQC 34
Temperature regulation class Class VI VI VI VI VI VI VI
Contribution of the temperature regulation % 4 4 4 4 4 4 4
Package Boiler with Temperature regulator QAA 55 + AQC 34
Seasonalenergye󰀩ciencyofpackageforroomheating% 98 98 98 98 98 98 98
Seasonalenergye󰀩ciencyclassofpackageforroomheating A+ A+ A+ A+ A+ A+ A+
+
=
Type THISION S PLUS Combi 24 Combi 34
ErP data according to 2010/30/EU
Indicatedloadprole XL XL
Seasonalroom-heatingenergye󰀩ciencyclass A A
Energye󰀩ciencyclassofwarmwaterprovision A A
Nominal heat output Pn(kW) 22 34
Annual energy consumption QHE (GJ) 7 11
Annual energy consumption AEC (kWh) 82 93
Annual fuel consumption AFC (GJ) 23 23
Seasonalroom-heatingenergye󰀩ciencyclass ηs(%) 94 94
Energye󰀩ciencyclassofwarmwaterprovision ηWH (%) 80 80
Noise output level, inside LWA (dB) 47 50
Temperature regulator QAA 55 + AQC 34
Temperature regulation class Class VI VI
Contribution of the temperature regulation % 4 4
Package Boiler with Temperature regulator QAA 55 + AQC 34
Seasonalroomheatingenergye󰀩ciencyofpackage% 98 98
Seasonalroomheatingenergye󰀩ciencyclassofpackage A+ A+
Energye󰀩ciencyclassofwarmwaterprovisionbypackage A A
+
=
ErP data for THISION S PLUS Combi

11
Product description
Dimensions of THISION S PLUS
Wall
C
E
F
A
V
U
T
Wall
B
NP
PQR
B
Wall
D
HJK
150150
G
L
HJK
G
D
Ceiling
350
S PLUS S PLUS Combi
L
M
Type THISION S PLUS 13 19 24 34 35L 46 54 Combi 24 Combi 34
A Boiler height mm 680 680 680 680 680 680 680 680 680
B Boiler width mm 500 500 500 500 660 660 660 840 840
C Boiler depth mm 385 385 385 385 385 385 385 385 385
D Flue gas nozzle mm 335 335 335 335 495 495 495 335 335
E Air intake mm 120 120 120 120 120 120 120 120 120
F Flue gas nozzle mm 270 270 270 270 270 270 270 270 270
G Gas connection mm 65 65 65 65 65 65 65 65 65
HBoilerowconnection mm 185 185 185 185 185 185 185 185 185
J Boiler return connection mm 285 285 285 285 445 445 445 285 285
K Condensate connection mm 370 370 370 370 530 530 530 370 370
L Expansion vessel mm 430 430 430
M Cylinder return connection mm 475 475 475
N Warm water mm 725 725
P Cold water mm 795 795
Q Connector length of g mm 18 18 18 18 18 18 18 18 18
R Connector length of c mm 40 40 40 40 40 40 40 40 40
S Connector length of v, r, a, k and w mm 60 60 60 60 60 60 60 60 60
T Condensate connection c mm 25 25 25 25 25 25 25 25 25
U Gas connector g mm 40 40 40 40 40 40 40 40 40
VBoilerowandreturnvandr
Cold and warm water k and w mm 50 50 50 50 50 50 50 50 50
Boiler connections
Flue gas nozzle mm 80 80 80 80 80 80 80 80 80
Air supply connector mm 125 125 125 125 125 125 125 125 125
g Gas connection 3/4"R 3/4"R 3/4"R 3/4"R 3/4”R 3/4"R 3/4"R 3/4"R 3/4"R
vBoilerowconnection mm 28 x 1"R 28 x 1"R 28 x 1"R 28 x 1"R 35 x 1 1/4"R 35 x 1 1/4"R 35 x 1 1/4"R 28 x 1"R 28 x 1"R
r Boiler return connection mm 28 x 1"R 28 x 1"R 28 x 1"R 28 x 1"R 35 x 1 1/4"R 35 x 1 1/4"R 35 x 1 1/4"R 28 x 1"R 28 x 1"R
c Condensate connection mm 24 24 24 24 24 24 24 24 24
a Expansion vessel mm 22 x 3/4"R 22 x 3/4"R 22 x 3/4"R 22 x 3/4"R* 22 x 3/4"R* 22 x 3/4"R* 22 x 3/4"R* 22 x 3/4"R
k Cold water mm 15 x 3/4”R 15 x 3/4”R
w Warm water mm 15 x 3/4”R 15 x 3/4”R
s Cylinder return connection mm 28 x 1"R 28 x 1"R 28 x 1"R 28 x 1”R* 28 x 1"R* 28 x 1"R* 28 x 1"R*
* Only with installed 3-way valve

12
Delivery scope
Standard version
Accessories
Standard version
The delivery scope of a boiler consists
of the following components:
Components Packaging type
Completely assembled and tested boiler 1 In cardboard box
Mounting rail 1 In boiler packaging, mounted on back side of the boiler
Connectors 1 Separate cardboard box in the boiler packaging
Outdoor sensor 1 Separate cardboard box in the boiler packaging
Room unit 1 Separate cardboard box in the boiler packaging
Cylinder sensor (not for THISION S PLUS Combi) 1 Separate cardboard box in the boiler packaging
Operating manual THISION S PLUS / Combi technician 1
In document bag in boiler packaging
Operating manual THISION S PLUS operator 1
Replacement part list 1
ERP label 1
Accessories
The following accessories can be
ordered:
- Flue gas pipes
- Sludge separator
- 3-way valve set (only for the types
34, 46 and 54)
- Expansion module AGU2.550,
for controlling a mixed heating
circuit, or for control on an air
supply ventilator and/or external
gas valve, in combination with
an alarm terminal. A maximum
of 3 AGU2.550 modules can be
installed;
- Additional control unit LOGON
B G2Z2, in case of more than 3
makes heating circuits, (incl. wall
housing, all required sensors and
plugs, as well as the necessary
material for bus communications).
Listed accessory parts have been a
specially constructed or selected for
the THISION S PLUS boiler, which
means they are very easy to install
(plug and play). You can compose your
own system solution, by selecting the
accessorycombinationthattsyour
needs. For details and prices, please
take a contact with the Elco Sales
Department.

13
Installation
Boiler transport
Boiler transport
The THISION S PLUS is a fully
equipped compact heating system,
which has been pre-set and tested at
the factory.
The dimensions of the packaging are:
- 13, 19, 24, 34:
590 x 990 x 470 mm (WxHxD)
- 35L, 46, 54:
750 x 990 x 470 mm (WxHxD)
- Combi 24 and 34:
930 x 990 x 470 mm (WxHxD)
This makes it possible to transport all
models in one piece through a normal
door. The boiler can be picked up
sideways or from the front with a forklift
truck for transport.
The THISION S PLUS can be
transported with a crane. However,
it must be ensured that the boiler is
attached in its packaging to a pallet.
Loading belts should be attached to the
pallet.
1 2 3 4
78
5 6
910 11 12
A
1
B
AB B
2
Unpacking instructions are printed on
the cardboard box. Please follow the
proposed steps.
Disassembly of panelling
The panelling has been packed
separately from the boiler in the
packaging. The panelling of the
boiler should be set aside, before the
assembly and until the boiler is taken
into operation, so as to avoid damage.
Panelling should be attached and
secured with the supplied screw,
after assembly of the boiler, or after
maintenance works.

14
Installation
Installation
Connections Installation
Install the boiler in a su󰀩ciently
ventilated room, which conforms to
current regulations.
The boiler should always be installed
in a space protected against frost.
When setting up the boiler, please
observe the intervals recommended
on the adjacent sketch Maintenance
worksbecomemoredi󰀩cult,incaseof
smaller intervals.
150mm 150mm
1000mm
Connections
The following chapter describes how
the various connection must be made
on the boiler:
- Hydraulic connections
- Condensate drainage connection
- Gas connection
- Flue gas connection
- Air supply connection
- Electrical connection
The boiler must be connected in such
a way that the system conforms to the
relevant standards and regulations
(European, national and local). It is the
responsibility of the installing technician
that these standards and regulations
are observed.
Hydraulic connections
The THISION S PLUS must be
installed in such a way so that a
prescribedminimumowisalways
ensured. In systems where the
radiatorsarettedwiththermostatic
valves, it is recommended to install
a pressure operated by-pass valve
downstream of the last radiator on
theheatingcircuit,oradi󰀨erential
pressure by-pass valve (available as an
accessoryitem)betweentheow(1)
and return (2) pipes.
The boiler contains an installed safety
valve of 3 bar. The drain of the safety
valve has an open connection to the
condensate drain.
There are connection possibilities for
an(optional)lling/emptyingcockand
a connection to an expansion vessel
(3).Thelling/emptyingcockand
connection to an expansion vessel
should be made in the return pipe of
the boiler. The Combi 24 model has an
installed expansion vessel of 12 litres.
Condensate connection (4)
Connection to the drainage system
is always installed in an “open”
fashion,sothatareuxintotheboiler
is avoided, in case of a stopped up
drainage system.
Gas connection (5)
The type plate of the THISION S PLUS
has been attached at the factory on the
left-hand side of the boiler system (after
removal of the panelling). The gas
type (natural gas or liquid gas) must
conform to the information on the type
plate, which contains the installation
information for the boiler.
The connection of the system to gas
mustbecarriedoutbyancertied
technician. Here too, the national and
local standards and regulations are
applicable.
The gas pipe must be attached leak-
proof to the gas connection (6) of the
boiler. It is recommended to install
a gas meter behind the THISION S
PLUS system.
Agasltercanbemounteddirectlyon
the gas connector.
Connection for the DHW tank return
connection (6).
Air supply / waste gas ow (7).
5 1 4 3 6
7
2
1 Boilerowconnection
2 Boiler return connection
3 Expansion vessel
4 Condensate drain
5 Gas
6 DHW tank return connection
7 Airsupply/uegas

15
Installation
Hydraulics
Circulation pumps
Pump head diagram
THISION S PLUS 13
THISION S PLUS 19
THISION S PLUS 24
The GRUNDFOS UPM3 25-75
ciculation pump, which is installed
at the factory for the boiler, operates
continuously and adapts its pump
speedtoheatrequirements(ΔT).
A low pump setting is only permitted,
when a hydraulic switch or system
separation has been installed.
Notesonownoisesseenextpage.
8
0,25 0,5 0,75 11,25 1,5 1,75 22,25 2,5 2,75 3
[m]
[m3/h]
45%
40%
35%
30%
25%
50%
55%
60%
65%
70%
75%
80%
85%
90%
8
0,25 0,5 0,75 11,25 1,5 1,75 22,25 2,5 2,75 3
[m]
[m3/h]
45%
40%
35%
30%
25%
50%
55%
60%
65%
70%
75%
80%
85%
90%
8
0,25 0,5 0,75 11,25 1,5 1,75 22,25 2,5 2,75 3
[m]
[m3/h]
45%
40%
35%
30%
25%
50%
55%
60%
65%
70%
75%
80%
85%
90%
Pump head diagram
THISION S PLUS 34
THISION S PLUS 24 Combi
THISION S PLUS 34 Combi
Pump head diagram
THISION S PLUS 35L*
THISION S PLUS 46*
THISION S PLUS 54*
* Note:
This boiler has to be connected to a
low velocity header and secondary
circuit pump.

16
Installation
Hydraulics
Circulation pumps
Pump modulation
A number of functions are available for
the modulating boiler pump.
• None(Functionisswitched-o󰀨)
• Demand (Do not use this function)
• Boiler setpoint (Do not use this
function)
• Tempdi󰀨erentialnominal
• Burner output (Do not use this
function)
Temp di󰀨erential nominal
The LMS continues to control the
boiler’s output such that the boiler
temperature setpoint is maintained.
Pump speed control controls the boiler
pump’s speed in a way that the
parameterized nominal temperature
di󰀨erentialofboilerreturnandboiler
owismaintained.
Ifthee󰀨ectivedi󰀨erentialisgreater
thanthenominaldi󰀨erential,the
pump’s speed is increased, otherwise it
is decreased.
The pump’s speed is limited by the
parameterized minimum and maximum
speed.
Recommended settings:
Radiators 20K
Underoorheating 10K
Mixed systems 10K
System separation (LV 20K
header/Plate heat exchanger)
GRUNDFOS UPM3 25-70
Boiler type
Circulating water volume (T=20K) Residual head Energy consumption
l/min l/u mbar kPa PWM (%) Pmax pump
[W]
EEI
13 9,5 570 200 20 45 15 < 0,20
19 13,0 781 200 20 55 25 < 0,20
24 15,8 950 200 20 60 28 < 0,20
34 24,1 1444 200 20 75 55 < 0,20
35L* 24,6 1473 200 20 55 25 < 0,20
46* 32,3 1938 200 20 70 49 < 0,20
54* 38,0 2279 200 20 90 60 < 0,20
Combi 24 15,8 950 200 20 60 28 < 0,20
Combi 34 24,1 1444 200 20 80 57 < 0,20
* Note:
This boiler has to be connected to a
low velocity header and secondary
circuit pump.
Line no. Selection possibilities Factory setting
2317 Tempdi󰀨erentialnominal 20 1)
2320 Pump modulation Tempdi󰀨erentialnominal2)
2321 Starting speed 100
2322 Pump speed min 45
2323 Pump speed max THI S PLUS 13: 45
THI S PLUS 19: 55
THI S PLUS 24 / Combi 24: 60
THI S PLUS 34 / Combi 34: 75
THI S PLUS 35L: 55
THI S PLUS 46: 70
THI S PLUS 54: 90
1) Adjust value to hydraulic system
2) Do not adjust this value
Minimum speed of the boiler pump
Values less than 45% only set in case
ofownoisesduringcommissioning.
In this case read new residual head
from chart and adjust the bypass
accordingly.
The use of a low velocity header or
plate heat exchangers can be set up to
min. 25% (OEM limitation).
Note:
Too low pump speeds can lead to
unfavorable temperature conditions
during ignition load and may result in
error messages.

17
Installation
Di󰀨erential pressure overow valve - accessory for THISION S
PLUS 13, 19, 24, 34, Combi 24, 34
Technical data:
Max. pressure: 10 bar
Max. temperature: 110°C
Setting scale: 0.1 - 0.6 bar
Connector dimensions: 2 x 1/2” -
self-sealing
Factory setting: 0.2 bar
Heating variant
THISION S PLUS 13
THISION S PLUS 19
THISION S PLUS 24
THISION S PLUS 34
DHW variant
THISION S PLUS 13
THISION S PLUS 19
THISION S PLUS 24
THISION S PLUS 34
Setting:
The ideal setting for a single- or two-
family house should set at 0.2 bar.
Turn the button (attention the securing
screw) and set the value in the setting
scale. After setting the value, tighten
the securing screw.
Plug
Plug
Plug

18
Installation
Low loss header - accessories
66
120
350
427.5
474.6
G1" G1"
270
190
140
R3/4"
R1"
R3/4"
40
368.5
G1/2" with
removable plug
500
675
390
66
200
430
587.5
634.6
G1 1/4" G1 1/4"
270
190
R3/4"
R1"
R3/4"
528.5
G1/2" with
removable plug
660
675
G1" with
removable cap
G1" with
removable cap
OPTIONAL OPTIONAL

19
Installation
Plate heat exchanger - accessories
-
10
20
30
40
50
0123456
Pressure loss in plate heat exchanger THISION S PLUS
kPa
m
3
/h

20
Installation
Water and hydraulic system
Heating water quality
Fill the installation with drinking
water.
In most cases, a central heating
installationcanbelledwithwater
according to the nationally valid
regulations, whereby a treatment of the
water is not necessary.
To avoid problems, the quality of
thellingwatermustconformtothe
requirements in Table 1.
Ifthellingwatershouldnotconform
to these requirements, then it is
recommended to treat the water
correspondingly (see VDI2035).
Warranty claims become invalid if the
systemhasnotbeenushedduring
installation,orifthellingwater
quality does not conform to the ELCO
requirements (see Table 1).
If anything should not be clear, or
in case of deviations, always take
upcontactwithELCOrst.The
warranties lapse, if any changes are
made without an advance agreement/
release by ELCO.
Installation:
- The use of groundwater,
demineralized water and distilled
water, is not permitted (an
explanation of these terms can be
found on the next page).
- If the drinking water quality lies
within the limits of the values in
Table 1, then one can proceed with
the installation of the system and
theushingoftheequipment.
- Residues of corrosion products
(magnetite), assembly materials,
cutting oil and other undesirable
products, must be removed during
theushingoperation.
- Another possibility for removing
dirtistheuseofalter.Thelter
type must conform to the system-
specicrequirementsandthe
type of contamination. ELCO
recommendstheuseofalter.In
such a case, one should make sure
to take the entire piping system into
consideration.
- The central heating installation must
be de-aerated properly, before it is
taken into operation. Please review
the Chapter “Commissioning” in this
regard.
- If a regular topping up of water is
required (> 5% per year), then there
is a problem with the system that
mustberemediatedbyacertied
technician. Regular topping up
with fresh water and oxygen adds
lime to the system, which leads to
deposits.
- If an anti-frost agent or other
additives are used, then it must be
regularlycheckedthatthelling
water quality conforms to the
manufacturer requirements.
- Inhibitors may only be used after
consultation with ELCO.
- The use of such agents must be
protocolled.
Floor heating
Whenaoorheatingsystemis
connected that uses plastic pipes, it
must be ensured that it conforms to the
standard DIN 4726-4729. If the system
doesnotfullthestandard,thena
system separation must be foreseen.
If the regulations with regard to
plastic piping are not observed, then
warranty claims become null and
void (see the warranty conditions).
Parameters Value
Water type Drinking water
Softened water
pH 6.0-8.5
Conductivity (at 20°C in µS/cm) Max. 2500
Iron (ppm) Max. 0.2
Hardness (°dH / °fH)
Installation volume/performance
<20 l/kW
1-12 °dH / 1-21.5 °fH
Installation volume/performance
>=20 l/kW
1-7 °dH / 1-12.5 °fH
Oxygen Oxygendi󰀨usionisnotpermittedduringoperations.
Max. 5% of the system volumes may be topped up annually.
Corrosion inhibitors See the Chapter "System water additives (inhibitors)"
pH raising or lowering agents See the Chapter "System water additives"
Anti-frost additives See the Chapter "System water additives"
Other chemical additives See the Chapter "System water additives"
Solid substances Not permitted
Residues in the heating water, which are not a component of
the drinking water are
not permitted
Table 1