geminox THRs 0.9-9 C User manual

Installation and maintenance instructions for the contractor
Gas condensing boiler
THRs
6 720 808 155-00.1O
THRs 0.9-9 C/DC/B120/B120 DC
THRs 2-17 C/DC/B120/B120 DC
THRs 2-17 M75 V/M75 H/M75 H DC
THRs 5-25 C/DC/B120
THRs 5-25 M75 V/H
THRs 10-35 C
THRs 10-50 C
6 720 808 441 (2016/03) UK

Contents
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03)
2
Contents
1 Key to symbols and safety instructions . . . . . . . . . . . . . . . . . . . 3
1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Product details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Standard delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Overview of the gas groups to be used . . . . . . . . . . . . . . 5
2.3 EC Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . 5
2.4 Data plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.5 Description of appliance . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.6 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.7 Dimensions, minimum distances and connections . . . . . 6
2.8 Dimensions in conjunction with flue accessories . . . . . . 9
2.9 Appliance layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.10 Electrical wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . 16
2.11 Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2.12 Specification with cylinder . . . . . . . . . . . . . . . . . . . . . . 19
2.13 Specification with cylinder (accessories) . . . . . . . . . . 20
3 Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.1 Location of boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.2 Gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.3 Flueing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.4 Air supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.5 Water circulation system . . . . . . . . . . . . . . . . . . . . . . . 21
3.6 Electrical supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4 Flue gas routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.1 Approved flue accessories . . . . . . . . . . . . . . . . . . . . . . 22
4.2 Installation conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.2.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.2.2 Arrangement of inspection apertures . . . . . . . . . . . . . 22
4.2.3 Routing the flue through a duct . . . . . . . . . . . . . . . . . . 22
4.2.4 Vertical flue gas routing . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.2.5 Horizontal flue gas routing . . . . . . . . . . . . . . . . . . . . . . 23
4.2.6 Separate pipe connection . . . . . . . . . . . . . . . . . . . . . . . 23
4.3 Length of FLUE pipes . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.3.1 Permissible flue pipe lengths . . . . . . . . . . . . . . . . . . . . 24
4.3.2 Flue gas routing as per CEN . . . . . . . . . . . . . . . . . . . . . 25
4.3.3 Determining the flue lengths for single assignment . . 27
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1 Important notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.2 Checking the size of the expansion vessel . . . . . . . . . . 28
5.3 Siting the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.4 Fitting the mounting bracket . . . . . . . . . . . . . . . . . . . . 29
5.5 Installing the appliance . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6 Installing pipework . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6.1 Installing the cold water safety assembly . . . . . . . . . . 30
5.6.2 Safety valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6.3 Draining off condensate . . . . . . . . . . . . . . . . . . . . . . . . 31
5.7 Connecting the flue pipe . . . . . . . . . . . . . . . . . . . . . . . . 31
5.8 Gas connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.9 Checking the connections . . . . . . . . . . . . . . . . . . . . . . 31
6 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.1 General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.2 Electrical connection of the boiler to the mains using the
supply cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.3 Connecting temperature sensors . . . . . . . . . . . . . . . . . 32
6.4 230 V connections on air-flow sensor . . . . . . . . . . . . . 32
6.4.1 DHW circulation pump . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.4.2 Temperature limiter for underfloor heating systems . 32
6.5 Connection of external accessories . . . . . . . . . . . . . . . 32
7 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.1 Overview of connections . . . . . . . . . . . . . . . . . . . . . . . 32
7.2 Before commissioning . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.2.1 Verifications prior to commissioning . . . . . . . . . . . . . . 32
7.3 Control elements and displays . . . . . . . . . . . . . . . . . . . 33
7.3.1 Keyboards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.3.2 Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.4 Switching the appliance on/off . . . . . . . . . . . . . . . . . . 34
7.5 Setting language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.6 Deaeration function . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.7 Selecting the central heating mode . . . . . . . . . . . . . . . 34
7.8 Setting the DHW heating . . . . . . . . . . . . . . . . . . . . . . . . 34
7.9 Setting the maximum rated heat input in heating
mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.10 After commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.11 Selecting manual mode . . . . . . . . . . . . . . . . . . . . . . . . . 34
8 Carrying out thermal disinfection
(THRs...C/DC with DHW cylinder,
THRs...B120 and THRs...M75) . . . . . . . . . . . . . . . . . . . . . . . . . 35
8.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9 Anti-block protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
10 Converting the appliance to different gas types . . . . . . . . . 35
10.1 Converting to a different gas type . . . . . . . . . . . . . . . . 35
10.2 Setting the gas/air ratio (CO2) . . . . . . . . . . . . . . . . . . . 36
10.3 Check the gas supply pressure . . . . . . . . . . . . . . . . . . . 37
11 Flue gas testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
11.1 Flue gas inspector mode (operation with constant
output) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
11.2 Checking flue system for leaks . . . . . . . . . . . . . . . . . . . 37
11.3 Checking the CO levels in flue gas . . . . . . . . . . . . . . . . 38
12 Environmental protection/disposal . . . . . . . . . . . . . . . . . . . . 38

Key to symbols and safety instructions
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03) 3
13 Inspection/Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
13.1 Description of various maintenance operations . . . . . 39
13.1.1 Calling up the last fault saved . . . . . . . . . . . . . . . . . . . . 39
13.1.2 Cleaning the fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
13.1.3 Cleaning the burner and checking the electrodes . . . . 40
13.1.4 Cleaning the heat exchanger . . . . . . . . . . . . . . . . . . . . . 40
13.1.5 Cleaning condensate trap . . . . . . . . . . . . . . . . . . . . . . . 40
13.1.6 Checking the 3-way valve . . . . . . . . . . . . . . . . . . . . . . . 40
13.1.7 Checking the expansion vessel (also see page 28) . . . 40
13.1.8 Checking electrical wiring . . . . . . . . . . . . . . . . . . . . . . . 40
13.1.9 Draining the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . 40
13.2 Checklist for inspection and maintenance (maintenance
and inspection log book) . . . . . . . . . . . . . . . . . . . . . . . .41
14 Operating, service and fault displays . . . . . . . . . . . . . . . . . . . 42
14.1 Service displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
14.2 Fault displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
14.2.1 Fault Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
15 Commissioning report for the appliance . . . . . . . . . . . . . . . . 45
16 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
16.1 Sensor values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
16.1.1 Outside temperature sensor (accessories) . . . . . . . . . 47
16.1.2 Flow/return temperature sensor, DHW temperature
sensor, flue gas temperature sensor, solar collector
sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
16.2 Pressure sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
16.3 Pump characteristic maps . . . . . . . . . . . . . . . . . . . . . . . 47
16.3.1 Pressure drop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
16.4 Technical Data of Control Unit LMS14 . . . . . . . . . . . . . 49
16.5 Operational status of the 2nd circuit pump (THRs...DC) .
51
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
1 Key to symbols and safety instructions
1.1 Key to symbols
Warnings
The following keywords are defined and can be used in this document:
•NOTICE indicates a situation that could result in damage to property
or equipment.
•CAUTION indicates a situation that could result in minor to medium
injury.
•WARNING indicates a situation that could result in severe injury or
death.
•DANGER indicates a situation that will result in severe injury or
death.
Important information
Additional symbols
1.2 General safety instructions
Instructions for the target group
These installation instructions are intended for gas fitters, plumbers,
heating engineers and electricians. All instructions must be observed.
Failure to comply with instructions may result in material damage and
personal injury, including possible loss of life.
▶ Read the installation instructions (heat source, heating controller,
etc.) before installation.
▶ Observe safety instructions and warnings.
▶ Observe national and regional regulations, technical rules and
guidelines.
▶ Keep a record of all work carried out.
Determined use
The product may only be used for the heating of central heating water
and for DHW heating in closed-loop DHW and heating systems.
Any other use is considered inappropriate. Any damage that may result
is excluded from liability.
If you smell gas
A gas leak could potentially cause an explosion. If you smell gas, observe
the following rules.
▶ Prevent flames or sparks:
– Do not smoke, use a lighter or strike matches.
– Do not operate any electrical switches or unplug any equipment.
Warnings in this document are identified by a warning
triangle printed against a grey background.
Keywords at the start of a warning indicate the type and
seriousness of the ensuing risk if measures to prevent
the risk are not taken.
This symbol indicates important information where
there is no risk to people or property.
Symbol Explanation
▶ Step in an action sequence
Cross-reference to another part of the document
• List entry
– List entry (second level)
Table 1

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03)
4
– Do not use the telephone or ring doorbells.
▶ Turn off the gas at the meter or regulator.
▶ Open windows and doors.
▶ Warn your neighbours and leave the building.
▶ Prevent anyone from entering the building.
▶ Well away from the building: call the National Gas Emergency Service
on 0800 111 999.
▶ L.P.G. boilers: Call the supplier’s number on the side of the gas tank.
Risk to life from poisoning by flue gas
There is a risk to life from escaping flue gas.
▶ Never modify any parts for flue gas routing.
▶ Ensure that flue pipes and gaskets are not damaged.
Risk to life from poisoning by flue gas due to inadequate combustion
There is a risk to life from escaping flue gas. If flues are damaged or
leaking, observe the following rules.
▶ Close off the fuel supply.
▶ Open windows and doors.
▶ If necessary, warn your neighbours and leave the building.
▶ Prevent anyone from entering the building.
▶ Rectify any damage to the flue immediately.
▶ Ensure that there is an adequate combustion air supply.
▶ Do not cover or reduce the size of ventilation apertures in doors,
windows and walls.
▶ Ensure that there is an adequate combustion air supply, including for
any heat sources, which have been installed at a later date, e.g. if
there are extractor fans, kitchen fans or air conditioning units with an
air discharge outside.
▶ Never operate the product, if there is an insufficient combustion air
supply.
Installation, commissioning and servicing
Installation, commissioning and servicing must only be carried out by a
competent, Gas Safe registered engineer.
▶ Carry out a gas tightness test after completing work on gas-carrying
components.
▶ Only use original spares.
Electrical work
Electrical work must only be carried out by qualified electricians.
▶ Before starting electrical work:
– Isolate all poles of the mains voltage and secure against
reconnection.
– Using suitable means, test that the power supply is disconnected.
▶ Also see connection diagrams of other system components.
Handover to the user
When handing over, instruct the user how to operate the heating system
and inform him about its operating conditions.
▶ Explain how to operate the heating system and draw the user's
attention to any safety-relevant action.
▶ Explain that modifications and repairs must only be carried out by an
authorised contractor.
▶ Advise the user to have the system serviced annually by a competent,
Gas Safe registered engineer.
▶ Leave the installation instructions and the operating instructions
with the user or at the gas meter.
2 Product details
THRs...C appliances are wall mounted gas condensing boilers providing
central heating. With the internal 3-way valve accessories, a DHW
cylinder can be connected.
THRs...DC appliances are wall mounted gas condensing boilers for
connecting two heating circuits. With the internal 3-way valve
accessories, a DHW cylinder can be connected.
THRs ...B120 and THRs...M75 are appliances for central heating and
DHW heating with an integrated DHW cylinder.
2.1 Standard delivery
Fig. 1
[1] Wall mounted gas condensing boiler
[2] Set of printed documents for product documentation
[3] Mounting bracket (THRs...C/DC and THRs...M75)
6 720 808 155-01.1O
1
3
2

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03) 5
2.2 Overview of the gas groups to be used
The code number indicates the gas group according to EN 437:
2.3 EC Declaration of Conformity
The design and operation of this product conform to European
Directives and the supplementary national requirements. Its conformity
is demonstrated by the CE designation.
You can ask for a copy of the declaration of conformity for this product.
For this see the contact address at the back cover of these instructions.
The nitrogen oxide content of the flue gas is lower than 60 mg/kWh.
The appliance is tested in accordance with EN 677.
2.4 Data plate
The data plate includes details of the appliance performance, approval
data and serial number.
Fig. 2 Data plate
2.5 Description of appliance
Basic Version THRs...C:
• Wall mounted gas condensing boiler for wall installation
• Control device
• Modulating high efficiency pump (energy efficiency labelling A)
• Connecting lead
• Display
• Automatic ignition
• Full protection with flame monitoring and solenoid valves to EN 298
• Optional connections for flue gas/combustion air as concentric pipe
Ø 80/125 mm, Ø 75/110 mm or as single pipe Ø 80 mm,
Ø 125 mm
• Variable speed fan
• Gas premix burner
• Temperature sensor and temperature control for central heating
• Temperature limiter in the flow
• Air vent valve
• Safety valve (heating)
• Pressure gauge (heating)
• Flue gas temperature limiter
• DHW priority
Additionally for THRs ...DC:
• Connections and heating circuit pump for the 2nd heating circuit
Additionally for THRs ...M75 and THRs ...B120:
• Expansion vessel
• Motorised three-way valve
• DHW cylinder
Wobbe index (WS) (15 °C) Gas family
12.5 - 15.2 kWh/m3Natural gas, types 2H
11.4 - 15.2 kWh/m3Natural gas, types 2E
20.2 - 24.3 kWh/m3LPG 3B/P
20.2 - 21.4 kWh/m3LPG 3P
Table 2
THRs
0,9-9 C/DC
0,9-9 B120/DC
2-17 C/DC
2-17 B120/DC
THRs
5-25 C/DC
5-25 B120
5-25 M75
THRs
10-35 C
10-50 C
Prod. ID. CE
0085AT0244
CE
0085AQ0543
CE
0085AR0323
Gas group
classification
(gas type)
Denmark
Czech Republic
Slovakia
Italy
United Kingdom
I2H
I2H
I2H
I2H
I2H
II2H3B/P
II2H3P
II2H3P
II2H3P
II2H3P
II2H3B/P
II2H3P
II2H3P
II2H3P
II2H3P
Type of installation B23, C13, C33, C53, C83, C93
Table 3

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03)
6
2.6 Accessories
• Connection set
• Flue accessories
• 8 l expansion vessel (THRs...C/DC)
• Cylinder temperature sensor
• Outside temperature sensor QAC34
• Room temperature-compensated QAA55/QAA75 heating controller
• Wireless module for installation in the boiler
• Wireless signal amplifier
• Wireless outside temperature sensor
• Room temperature-compensated wireless QAA58/QAA78 heating
controller
• External flow temperature sensor with pipe clip
• Cascade module (clip-in)
• Heating circuit module (clip-in)
• Solar module (clip-in, THRs...C/DC)
• Connection set for connecting a third extension module
• 3-way valve for connecting a DHW cylinder (for installation in the
THRs...C/DC heating appliance)
• Gas type conversion set (THRs 5-25)
• DHW cylinder (THRs...C/DC)
• Condensate pump
2.7 Dimensions, minimum distances and connections
Fig. 3 THRs 0.9-9 C/DC and THRs 2-17 C/DC and THRs 5-25 C/DC
(dim. in mm)
Key to Fig. 3:
[1] Heating return
[2] Heating flow
[3] Drain from safety valve
[4] Condensate drain
[5] 2nd heating circuit heating return (THRs...DC)
[6] 2nd heating circuit heating flow (THRs...DC)
[7] Gas
[8] Connection for DHW cylinder return (accessories)
[9] Connection for DHW cylinder flow (accessories)
[10] Flue pipe
Below is a list of typical accessories for this appliance.
You can find comprehensive details of all available
accessories in our catalogue.
19
114
367
100
56
62 184 42
21
48
55
540
760
495
120 80
82
10100
8
9
7
56
2
1
3 4
6 720 808 155-06.1O
10
10

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03) 7
Fig. 4 THRs 10-35 C/THRs 10-50 C (dim. in mm)
Key to Fig. 4:
[1] Heating return
[2] Drain from safety valve
[3] Heating flow
[4] Connection for module (accessories)
[5] Condensate drain
[6] Gas
[7] Flue pipe
Fig. 5 THRs 0.9-9/2-17/5-25 B120/B120 DC (dim. in mm)
Key to Fig. 5:
Data before/after the forward slash represents the maximum/
minimum values depending on the set height of the feet.
For connections see Fig. 11.
79
10
10
765
760
495
120 68
59
56
324
117
19
56
46
56
397
27
4 5
1 32
7
7
6 720 808 155-39.1O
6
33
600
173
235
902/882
828/808
548
258
371
1745/1725
33
34
33
34
33
Ø50
235
815/795
853/833
172
116
120
172
228
36
113
17
116
584
662
6 720 808 155-40.1O

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03)
8
Fig. 6 THRs 2-17/5-25 M75 V (dim. in mm)
Fig. 7 THRs 2-17/5-25 M75 H and THRs 2-17 M75 H DC
(dim. in mm)
Key to Fig. 6 and Fig. 7:
[1] Heating return
[2] Drain from safety valve
[3] Heating flow
[4] Gas
[5] Condensate drain
[6] Cold water
[7] DHW
[8] Flue pipe
[9] 2nd heating circuit heating flow (THRs 2-17 M75 H DC)
[10] 2nd heating circuit heating return (THRs 2-17 M75 H DC)
49
55
55
480
59
64
19
62
66 91 65
25
79
540
1500
600635
120 82
79
10
100
123
4
5
6
7
8
8
6 720 808 155-07.1O
1000
760
495
59
55
52
365
70
121
100 42
15
120 83
19
79
10
10
75 226
480
5 4
1
6
2 3
7
8
8
6 720 808 155-08.1O
9
10

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03) 9
2.8 Dimensions in conjunction with flue accessories
Fig. 8 Dimensions and minimum clearances
[1] Flue accessory
Wall
thickness S K [mm] for Ø flue accessories [mm]
Ø 80 Ø 80/125 Ø 75/110
15 - 24 cm 110 155 135
24 - 33 cm 115 160 145
33 - 42 cm 120 165 150
42 - 50 cm 145 170 160
Table 4 Wall thickness S subject to flue accessories
THRs C [mm]
0.9-9/2-17/5-25 C/DC 82
10-35/10-50 C 79
0.9-9 B120/B120 DC
2-17 B120/B120 DC
5-25 B120/B120 DC
371
2-17/5-25 M75 V 79
2-17 M75 H/M75 H DC
5-25 M75 H
79
Table 5 Dim. C
Flue accessories for horizontal flue pipe A [mm]
Ø 75/110 mm
Ø 75/110 mm
horizontal connection accessories
(THRs 0,9-9/2-17/5-25)
70
Ø 80/125 mm
Ø 80/125 mm
horizontal connection accessories
(THRs 10-35/10-50)
70
Table 6 Dimension A subject to flue accessories
Flue accessories for vertical flue pipe B [mm]
Ø 80/125 mm
Ø 80/125 mm connecting adaptor
(THRs 0,9-9/2-17/5-25)
500
Ø 80/125 mm
Ø 80/125 mm connecting adaptor
(THRs 10-35/10-50)
500
Table 7 Dimension B subject to flue accessories
B
K
S
6 720 808 155-42.1O
A
5,2 %
1
100
C

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03)
10
2.9 Appliance layout
Fig. 9 THRs 0.9-9 C/DC and THRs 2-17 C/DC and THRs 5-25 C/DC appliance layout
[1] Gas connection
[2] 2nd heating circuit overheating protection (THRs...DC)
[3] 2nd heating circuit heating circuit pump (THRs..DC)
[4] 2nd heating circuit flow temperature sensor (THRs...DC)
[5] Mixing valve with motor (THRs..DC)
[6] Control device
[7] Flue gas temperature sensor
[8] Flue pipe
[9] Heat exchanger
[10] Ignition transformer
[11] Gas valve
[12] Sight glass
[13] Burner
[14] Flow temperature sensor and heat exchanger temperature limiter
[15] Pressure gauge
[16] Fan
[17] Return temperature sensor
[18] Automatic air vent valve
[19] Siphon
[20] Heating circuit pump
[21] Pressure sensor
[22] Drain tap
[23] Connection for expansion vessel (THRs..DC, accessories)
[24] Heating return
[25] Drain from safety valve
[26] Safety valve
[27] Heating flow
[28] Condensate drain
[29] Connection for DHW cylinder flow (accessories)
[30] Connection for DHW cylinder return (accessories)
[31] 2nd heating circuit heating return (THRs...DC)
[32] 2nd heating circuit heating flow (THRs...DC)
1
7
9
10
12 1113 1114
16
17
18
20
22
21
242526272830
6 720 808 155-34.1O
6
11
8
19
4
3
2
5
233132
1115
29

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03) 11
Fig. 10 THRs 10-35 C/THRs 10-50 C appliance layout
[1] Gas connection
[2] Siphon
[3] Control device
[4] Flue gas temperature sensor
[5] Flue pipe
[6] Heat exchanger
[7] Ignition transformer
[8] Gas valve
[9] Sight glass
[10] Burner
[11] Fan
[12] Flow temperature sensor and heat exchanger temperature limiter
[13] Return temperature sensor
[14] Automatic air vent valve
[15] Pressure gauge
[16] Heating circuit pump
[17] Pressure sensor
[18] Drain tap
[19] Heating return
[20] Drain from safety valve
[21] Safety valve
[22] Heating flow
[23] Condensate drain
1
4
6
7
12
16
18
17
19202122
6 720 808 155-33.2GX
3
2
8
5
13
14
23
15

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03)
12
Fig. 11 THRs 0.9-9/2-17/5-25 B120 and THRs 0.9-9/2-17 B120 DC appliance layout
[1] Opening for circulation line
[2] Cold water
[3] Opening for transport and condensate drain
[4] Drain from safety valve
[5] Heating flow
[6] Heating return
[7] Expansion vessel
[8] Gas connection
[9] 2nd heating circuit heating flow (THRs...DC)
[10] 2nd heating circuit heating return (THRs...DC)
[11] Opening for transport and condensate drain
[12] DHW
[13] Drain tap
[14] Cylinder temperature sensor
[15] Inspection aperture
[16] DHW outlet
[17] Cylinder return
[18] Condensate drain
[19] Safety valve
[20] 2nd heating circuit overheating protection (THRs...DC)
[21] 2nd heating circuit heating circuit pump (THRs..DC)
[22] 2nd heating circuit flow temperature sensor (THRs...DC)
[23] Mixing valve with motor (THRs...DC)
[24] Control device
[25] Flue gas temperature sensor
[26] Flue pipe
[27] Heat exchanger
[28] Ignition transformer
[29] Gas valve
[30] Sight glass
[31] Burner
[32] Pressure gauge
[33] Flow temperature sensor and heat exchanger temperature limiter
[34] Fan
[35] Return temperature sensor
[36] Automatic air vent valve
[37] Heating circuit pump
[38] Siphon
[39] Heating return, 3-way valve with motor
[40] Drain tap
[41] Pressure sensor
[42] Drain from safety valve
[43] Cylinder flow
[44] Cold water
[45] Thermal insulation
[46] Coiled piping
[47] DHW cylinder
1
2
3
4
5
6
7
8
11
12
13
14
15
16
17
18
20
22
24
25
26
33
27
28
29
30 31
34
35
36
37
40
41
45
46
47
6 720 808 155-35.1O
9
10 19
21
23 38
39
42
43
44
32

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03) 13
Fig. 12 THRs 2-17/5-25 M75 V appliance layout
Key to Fig. 12:
[1] Gas connection
[2] Cylinder return
[3] Cylinder flow
[4] Cylinder temperature sensor
[5] DHW cylinder
[6] Siphon
[7] Control device
[8] Flue gas temperature sensor
[9] Flue pipe
[10] Heat exchanger
[11] Gas valve
[12] Ignition transformer
[13] Burner
[14] Sight glass
[15] Flow temperature sensor and heat exchanger temperature limiter
[16] Pressure gauge
[17] Fan
[18] Return temperature sensor
[19] Automatic air vent valve
[20] Heating circuit pump
[21] Inspection aperture
[22] Thermal insulation
[23] Expansion vessel
[24] Coiled piping
[25] Motorised 3-way valve
[26] Pressure sensor
[27] Drain tap
[28] Heating return
[29] Drain from safety valve
[30] Heating flow
[31] Safety valve
[32] Connection without function
[33] DHW outlet
[34] Cold water
[35] Condensate drain
1
2
4
5
6
7
8
26
9
10
11
12 13 14 15
17
18
19
20
21
22
23
24
25
27
28
293032333435
6 720 808 155-31.1O
31
3
16

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03)
14
Fig. 13 THRs 2-17/5-25 M75 H appliance layout
[1] Gas connection
[2] Expansion vessel
[3] Siphon
[4] Heating circuit pump
[5] Control device
[6] Flue gas temperature sensor
[7] Flue pipe
[8] Heat exchanger
[9] Gas valve
[10] Ignition transformer
[11] Burner
[12] Sight glass
[13] Flow temperature sensor and heat exchanger temperature limiter
[14] Pressure gauge
[15] Fan
[16] Inspection aperture
[17] DHW cylinder
[18] Thermal insulation
[19] Return temperature sensor
[20] Cylinder temperature sensor
[21] Coiled piping
[22] Cylinder flow
[23] Hot water outlet
[24] Cold water
[25] Automatic air vent valve
[26] Cylinder return
[27] Motorised 3-way valve
[28] Drain tap
[29] Heating return
[30] Pressure sensor
[31] Drain from safety valve
[32] Heating flow
[33] Condensate drain
[34] Connection without function
[35] Safety valve
6 720 808 155-32.1O
23
24
1
22
25272930 2631323334
4
35 28
2
3
21
19
5
6
7
8
9
10 11 12 13 15 16
20
17
18
14

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03) 15
Fig. 14 THRs 2-17 M75 H DC appliance layout
[1] Gas connection
[2] 2nd heating circuit overheating protection
[3] 2nd heating circuit heating circuit pump
[4] Siphon
[5] 2nd heating circuit flow temperature sensor (THRs...DC)
[6] Heating circuit pump
[7] Mixing valve with motor
[8] Control device
[9] Flue gas temperature sensor
[10] Flue pipe
[11] Heat exchanger
[12] Gas valve
[13] Ignition transformer
[14] Burner
[15] Sight glass
[16] Flow temperature sensor and heat exchanger temperature limiter
[17] Pressure gauge
[18] Fan
[19] Inspection aperture
[20] DHW cylinder
[21] Thermal insulation
[22] Return temperature sensor
[23] Cylinder temperature sensor
[24] Coiled piping
[25] Cylinder flow
[26] DHW outlet
[27] Cold water
[28] Automatic air vent valve
[29] Cylinder return
[30] Motorised 3-way valve
[31] Drain tap
[32] Expansion vessel connection (accessory)
[33] Heating return
[34] Pressure sensor
[35] Drain from safety valve
[36] Heating flow
[37] Condensate drain
[38] Connection without function
[39] Safety valve
[40] 2nd heating circuit heating return
[41] 2nd heating circuit heating flow
6 720 808 155-36.1O
26
27
1
25
28303234 2935363738
6
39 31
3
4
24
22
8
9
10
11
12
13 14 15 16 18 19
23
20
21
2
5
7
33
40
41
17

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03)
16
2.10 Electrical wiring diagram
Fig. 15
on
X2
H2 MBX21 MBX22 U+
X1
X50
12
AGU2.550
L N QX23 N QX22 N QX21
on
X2
H2 MBX21 MBX22 U+
X1
X50
12
AGU2.550
LNQX23 NQX22 N QX21
57AAQ
1T-
PE
~
M
E
P
WW
N
ZH
1S
P
N
L
~
M
N
L
7AAQ
~
M
N
L
~
M
N
L
on
12
42
on
12
41
1
2
3
6
9
8
7
43
45
10
11
17
12
13
14
15
16
18
19
27
31
28
29
30
20
5
32 34 21
24
22
23
25
26
5
33 35 36
37
44
45
38
39 40
6 720 808 155-11.1O

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03) 17
Key to Fig. 15:
[1] Power supply
[2] Output connection QX2 for domestic hot water circulation pump
(THRs...C with DHW cylinder)
[3] 3-way valve for connecting a DHW cylinder
(accessories for THRs...C)
[4] Output QX1 can be configured
[5] Heating circuit pump and power supply for AGU2.550 extension
module
[6] Fan
[7] External switching contact, potential-free (e.g. temperature
monitor for underfloor heating system, bridged when delivered
from the factory)
[8] Ignition transformer
[9] Gas valve
[10] Ionisation electrode
[11] Input H6
[12] Sensor input BX1, can be configured
[13] Flue gas temperature sensor
[14] DHW temperature sensor 2 BX3
[15] DHW temperature sensor 1 B3
[16] Connection for outside temperature sensor QAC34
[17] Input H1, can be configured
[18] Input H4, can be configured
[19] Input H5, can be configured
[20] LPB OCI345 module
[21] Pressure sensor
[22] Heating return temperature sensor
[23] Boiler temperature sensor
[24] Connection for heating controller QAA75
[25] Connection for wireless module AVS71
[26] AVS37 user interface
[27] Programming interface
[28] Connection for AGU2.550 extension module (accessories)
[29] PWM fan
[30] PWM heating circuit pump
[31] Fuses (2xT6.3 H250)
[32] Heating circuit pump connection (2nd heating circuit), QX23
[33] Connection for solar pump, QX23
[34] Connection for mixing valve motor (2nd heating circuit)
[35] Relay output QX22, can be configured
[36] Relay output QX21, can be configured
[37] Connection for flow temperature sensor BX21 (2nd heating
circuit)
[38] Sensor input BX22 (2nd heating circuit)
[39] Connection for solar collector sensor BX21 (solar module)
[40] Connection for DHW temperature sensor BX22 on solar cylinder
(solar module)
[41] Addressing of extension module 1
[42] Addressing of extension module 2
[43] ON/OFF switch
[44] AGU2.550 extension module 1
[45] AGU2.550 extension module 2

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03)
18
2.11 Specification
Unit
THRs
0.9-9 C
0.9-9DC
THRS
2-17 C
2-17DC
THRs
5-25 C
5-25DC
THRs
10-35 C
THRs
10-50 C
THRs
2-17 M75
THRs
5-25 M75
Max. rated output (Pmax) 50/30 °C kW 9.8 18.3 25.8 35.7 52.6 18.3 25.8
Max. rated output (Pmax) 80/60 °C kW 9.1 16.9 23.9 33.1 48.7 16.9 23.9
Max. rated heat input (Qmax) central heating kW 9.3 17.4 24.5 34.0 50.0 17.4 24.5
Min. rated output (Pmin) 50/30 °C kW 1.2 2.6 5.4 10.7 10.7 2.6 5.4
Min. rated output (Pmin) 80/60 °C kW 1.0 2.3 4.8 9.7 9.7 2.3 4.8
Min. rated heat input (Qmin) central heating kW 1.1 2.5 5.0 10.0 10.0 2.5 5.0
Max. rated heat input (QnW) DHW kW 9.3 17.4 24.5 34.0 50.0 17.4 24.5
Min. rated heat input (QnW) DHW kW 1.1 2.5 5.0 10.0 10.0 2.5 5.0
Appliance efficiency, max. output heat curve 80/60 °C % 90/97.4 96/97.4 96/97.4 95.9/97.3 95.9/97.3 96/97.4 96/97.4
Appliance efficiency, max. output heat curve 50/30 °C %
109/
105.4
108/
105.8
108/
105.3
107.7/
105.1
107.7/
105.1
108/
105.8
108/
105.3
Appliance efficiency under partial load (30%) according to
92/42 EWG % 108.5 108.5 108.5 107.7 107.7 108.5 108.5
Gas supply value
Natural gas H (Hi(15 °C) = 9.5 kWh/m3)m
3/h 0.98 1.84 2.59 3.70 5.29 1.84 2.59
Butane/propane (Hi= 12.9 kWh/kg) kg/h --1.90 2.72 3.88 - 1.90
Permissible gas supply pressure
Natural gas H mbar 17 - 25 17 - 25 17 - 25 17 - 25 17 - 25 17 - 25 17 - 25
LPG mbar --- 25 – 45 25 – 45 25 – 45 25 – 45
Expansion vessel
Pre-charge pressure bar 0.751) 0.751) 0.751) 0.751) 0.751) 0.75 0.75
Total capacity l 81) 81) 81) 81) 81)
H: 8
V: 10
H: 8
V: 10
DHW
Specific flow rate according to EN 13203 l/min ----- 12.4 16.0
Outlet temperature range °C ----- 10–65 10–65
Max. permissible water supply pressure bar -----1010
Min. inlet pressure bar -----11
Calculation figures for calculating cross-sectional area
to EN 13384
Flue gas mass flow rate min./max. rated kg/h 16.4/2.2 30.7/4.9 51.2/9.7 87.3/19.9 87.3/19.9 30.7/4.9 51.2/9.7
Flue gas temperature 80/60 °C max./min. rated °C 75/60 80/60 85/62 80/60 85/62 80/60 85/62
Flue gas temperature 40/30 °C max./min. rated °C 42/30 47/30 55/32 47/30 55/32 47/30 55/32
Max. standard CO emissions factor mg/kWh 50 50 50 50 50 50 50
Max. standard NOxemissions factor mg/kWh 60 60 60 60 60 60 60
Available fan draught min rated Pa 100 100 100 100 100 100 100
Required combustion air min./max. m3/h 1.5/11.4 3.4/21.4 6.8/35.7 14.0/60.8 14.0/60.8 3.4/21.4 6.8/35.7
CO2at max. rated output for natural gas H and LPG % 9.5/ - 9.5/ - 9.5/11.0 9.5/11.0 9.5/11.0 9.5/ - 9.5/11.0
CO2for min. rated output for natural gas H and LPG % 8.5/ - 8.5/ - 8.5/10.5 8.5/10.5 8.5/10.5 9.5/ - 8.5/10.5
Condensate
Max. condensate quantity (tR= 30 °C) l/h 0.9 1.3 1.8 2.5 3.6 1.3 1.8
pH level, approx. – 3.5 3.5 3.5 3.5 3.5 3.5 3.5
General data
Power supply voltage AC ... V 230 230 230 230 230 230 230
Frequency Hz 50 50 50 50 50 50 50
Max. power consumption in standby mode W 5555555
Power consumption in heating mode at min./max. rated
output (without heating circuit pump) W 13/33 14/33 15/32 14/25 14/43 14/33 15/32
Heating circuit pump power consumption in heating mode at
min./max. rated output W 11/36 11/36 11/50 - /67 - /67 11/36 11/50
Table 8
.
.
.
.

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03) 19
2.12 Specification with cylinder
Key to Tab. 9:
TSp Temperature of the Tank
TZDHW outlet temperature
2nd heating circuit pump power consumption in heating
mode Speed 1/2/3 W
DC :
15/34/45
DC :
15/34/45
DC :
15/34/45
----
Power consumption in DHW operation at min./max. rated
output
(without heating circuit pump) W ----- 14/33 15/32
Heating circuit pump power consumption in DHW operation
at min./max. rated output W ----- - /63 - /63
Absorbed intensity A
C : 0.30
DC : 0.50
C : 0.30
DC : 0.50
C : 0.35
DC : 0.55 0.40 0.48 0.42 0.41
Max. power consumption W
C : 69
DC : 114
C : 69
DC : 114
C : 82
DC : 127 92 110 96 95
EMC limit class – BBBBBBB
IP rating (with B23 type of installation) IP 24 24 24 24 24 24 24
IP rating (with C13/C33 type of installation) IP 44 44 44 44 44 24 44
Max. flow temperature °C 80 80 80 80 80 80 80
Over-heating safety of combustion products °C 100 100 100 100 100 100 100
Water overheating safety thermostat °C 92 92 92 92 92 92 92
Max. permissible operating pressure (PMS) heating bar 3333333
Permissible ambient temperature °C 0–50 0–50 0–50 0–50 0–50 0–50 0–50
Nominal capacity of appliance heating l 2.5 2.5 2.5 3.8 3.8 2.5 7.5
Nominal capacity (heat exchanger) l ------3.2
Weight (excl. packaging) kg
C: 52
DC: 61
C: 52
DC: 61
C: 52
DC: 61 64 65
V:113
H:101
V:113
H:101
Dimensions, W x H x D mm
540
x760
x367
540
x760
x367
540
x760
x367
765
x760
x397
765
x760
x397
H:
1000
x760
x480
V:
540
x1500
x480
H:
1000
x760
x480
V:
540
x1500
x480
1) Accessory
Unit
THRs 0,9-9
B120 DC
THRs 2-17 THRs 5-25
B120/B120 DC B120
Tank capacity l 120 120 120
Max. power consumption in cylinder operation kW 9,1 16.9 23.9
Flow rate at TZ= 40 °C l/min 4,4 8.1 11.4
Specific flow rate according to EN 13203 l/min 13,6 18.1 18.7
Min. heat-up time at TSp = 60 °C1)
1) following draw-off with specific flow rate
min 34 18 13
Min. charging time at TSp = 60 °C min 60 32 23
Max. draw rate at TZ=40 °C, TSp = 65 °C, t=10 min l 186 186 187
Max. draw rate at TZ=40 °C, TSp = 65 °C, t=1 h l 404 591 758
Heat loss via casing (at 65 °C in cylinder) W 53,7 53,7 53.7
Table 9 THRs 0.9-9/2-17B120/B120 DC
Unit
THRs
0.9-9 C
0.9-9DC
THRS
2-17 C
2-17DC
THRs
5-25 C
5-25DC
THRs
10-35 C
THRs
10-50 C
THRs
2-17 M75
THRs
5-25 M75
Table 8

Product details
THRs 0.9-9/2-17/5-25/10-35/10-50 – 6 720 808 441 (2016/03)
20
2.13 Specification with cylinder (accessories)
Key to Tab. 10, Tab. 12, Tab. 11, and Tab. 13:
TSp Temperature of the Tank TZDHW outlet temperature
Unit
THRs 2-17
M75 V/M75 H/M75 H DC
THRs 5-25
M75 V/M75 H
Tank capacity l 75 75
Max. power consumption in cylinder operation kW 16.9 23.9
Flow rate at TZ= 40 °C l/min 8.11) 11.41)
1) Set flow rate at safety assembly on commissioning
Specific flow rate according to EN 13203 l/min 12.4 16.0
Min. heat-up time at TSp = 60 °C2)
2) following draw-off with specific flow rate
min 11 8
Min. charging time at TSp = 60 °C min 19 14
Max. draw rate at TZ=40 °C, TSp = 65 °C, t=10 min l 124 158
Max. draw rate at TZ=40 °C, TSp = 65 °C, t=1 h l 529 729
Heat loss via casing (at 65 °C in cylinder) W 67 67
Table 10 THRs 2-17/5-25 M75
Unit
THRs 5-25 C/DC with
BS 100 BS 150 BS 200 BS 300
Tank capacity l 100 150 200 300
Max. power consumption in cylinder operation kW 23.9 23.9 23.9 23.9
Flow rate at TZ= 40 °C l/min 11.4 11.4 11.4 11.4
Specific flow rate according to EN 13203 l/min 17.6 23.9 27.2 35.2
Min. heat-up time at TSp = 60 °C min 11 17 21 33
Min. charging time at TSp = 60 °C min 19 29 38 58
Max. draw rate at TZ=40 °C, TSp = 65 °C, t=10 min l 176 241 313 476
Max. draw rate at TZ=40 °C, TSp = 65 °C, t=1 h l 748 813 885 1047
Heat loss via casing (at 65 °C in cylinder) W 58 77 97 136
Table 11 THRs 5-25 C/DC with cylinder (accessory)
Unit
THRs 0.9-9 C/DC with THRs 2-17 C/DC with
BS 100 BS 150 BS 200 BS 300 BS 100 BS 150 BS 200 BS 300
Tank capacity l 100 150 200 300 100 150 200 300
Max. power consumption in cylinder operation kW 9,1 9.1 9.1 9.1 16.9 16.9 16.9 16.9
Flow rate at TZ= 40 °C l/min 4,4 4.4 4.4 4.4 8.1 8.1 8.1 8.1
Specific flow rate according to EN 13203 l/min 12,3 16.3 19.9 27.8 16.0 20.2 23.7 31.7
Min. heat-up time at TSp = 60 °C min 29 43 56 86 15 23 30 46
Min. charging time at TSp = 60 °C min 51 77 100 153 28 42 54 82
Max. draw rate at TZ=40 °C, TSp = 65 °C, t=10 min l 160 241 313 476 160 241 313 476
Max. draw rate at TZ=40 °C, TSp = 65 °C, t=1 h l 377 459 531 693 564 645 717 880
Heat loss via casing (at 65 °C in cylinder) W 58 77 97 136 58 77 97 136
Table 12 THRs 0.9-9 C/DC and 2-17 C /DC with cylinder (accessory)
Unit
THRs 10-35 C with THRs 10-50 C with
BS 100 BS 150 BS 200 BS 300 BS 100 BS 150 BS 200 BS 300
Tank capacity l 100 150 200 300 100 150 200 300
Max. power consumption in cylinder operation kW 33.1 33.1 33.1 33.1 35 35 50 50
Flow rate at TZ= 40 °C l/min 15.8 15.8 15.8 15.8 16.7 16.7 23.3 23.3
Specific flow rate according to EN 13203 l/min 22.0 25.2 31.3 39.8 22.9 26.1 35.4 47.5
Min. heat-up time at TSp = 60 °C min 81216 24 71111 16
Min. charging time at TSp = 60 °C min 14 21 28 42 13 20 19 29
Max. draw rate at TZ=40 °C, TSp = 65 °C, t=10 min l 220 252 313 476 229 261 354 476
Max. draw rate at TZ=40 °C, TSp = 65 °C, t=1 h l 1012 1044 1105 1267 1067 1098 1519 1641
Heat loss via casing (at 65 °C in cylinder) W 58 77 97 136 58 77 97 136
Table 13 THRs 10-35 C and 10-50 C with cylinder (accessory)