Baxi POWER HT+ Series Manual

Australia - New Zealand
e
en
Installation and service manual
Gas fired floor-standing condensing boiler
POWER HT+ 1.50
POWER HT+ 1.70
POWER HT+ 1.90
POWER HT+ 1.110

Dear customer,
Thank you for purchasing this appliance.
Please read this manual carefully before using the product and keep it in a safe place for future reference.
In order to ensure continued safe and efficient operation we recommend that the product is regularly maintained. Our Service
and After Sales organization can assist with this.
We hope you will receive many years of satisfactory service.

Contents
1
1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 Liabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3.1 Installer's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.3.2 Manufacturer's liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2 About this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2 Symbols used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.1 Symbols used in the manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.2 Symbols used on the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2.3 Abréviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Homologations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1.1 Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1.2 Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.2.1 Sensor characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3 Dimensions and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.4 Electrical diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Description of the product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.2 Operating principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2.1 Gas/air setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2.2 Low-loss header (accessory) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.2.3 System in cascade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.2.4 Settings and safety devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3 Main components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.4 Control panel description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.4.1 Description of the keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.4.2 Description of the symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
4.5 Standard delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.6 Accessories and options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5 Before installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.1 Regulations governing installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.2 Installation requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
5.2.1 Water treatment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.2.2 Gas supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
5.2.3 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.2.4 Circulation pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.3 Choice of the location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.3.1 Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.3.2 Dimensions of the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.3.3 Data plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3.4 Selecting the position for the outside temperature sensor (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
5.4 Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
5.5 Unpacking and initial preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.6 Connecting diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.7 Connecting diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.7.1 Connection diagram: 1 boiler + 1 direct circuit + 1 domestic hot water tank . . . . . . . . . . . . . . . . . . . . . . . . 33
5.7.2 Connection diagram: 1 boiler + 1 direct circuit + 1 underfloor heating circuit + 1 domestic hot water tank . .34
5.7.3 Connection diagram: Boilers in cascade + 1 direct circuit + 1 underfloor heating circuit + 1 domestic hot
water tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.7.4 Connection diagram: controlling a boiler in 0/10 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.2 Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Contents
7609474 - v02 - 04092014 3

6.2.1 Accessing the internal boiler components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.3 Water connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.3.1 Connection of the heating circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.3.2 Connecting the expansion vessel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.3.3 Connecting the condensate discharge pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
6.4 Gas connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.5 Air supply/flue gas connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.5.1 Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.5.2 Coaxial pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.5.3 Separate pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
6.5.4 Pipes in cascade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.5.5 Lengths of the air/flue gas pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.6 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.6.1 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
6.6.2 Recommended cable cross section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
6.6.3 Accessing the terminal blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.6.4 Wiring the terminal blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.6.5 Description of the power supply terminal block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
6.6.6 Description of the sensor terminal block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.6.7 Electrical connection: 1 boiler + 1 direct circuit + domestic hot water tank . . . . . . . . . . . . . . . . . . . . . . . . . . 52
6.6.8 Electrical connection: 1 boiler + 1 direct circuit + 1 underfloor heating circuit + domestic hot water tank . . . 52
6.6.9 Electrical connection: Boilers in cascade + 1 direct circuit + 1 underfloor heating circuit + 1 domestic hot
water tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.6.10 Electrical connection: controlling a boiler in 0/10V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.6.11 Connecting boilers in cascade with an O
OCI 345
interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.7 Filling the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.7.1 Filling the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.8 Finalising the installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
7 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
7.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
7.2 Check-list before commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
7.3 Commissioning procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
7.3.1 First time commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
7.3.2 Checking the gas inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
7.3.3 Checking the electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
7.3.4 Checking the hydraulic circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
7.4 Gas settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
7.4.1 Configuring the fan speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
7.4.2 Setting the air/gas ratio (maximum thermal flow rate) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
7.4.3 Setting the air/gas ratio (reduced thermal flow rate) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
7.4.4 Gas valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
7.4.5 CO2 checking and setting values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
7.4.6 Adapting to another gas type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
7.5 Checks and adjustments after commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
7.5.1 Configuring an installation with 1 boiler + 1 low-loss header + 1 direct circuit + 1 underfloor heating circuit +
domestic hot water tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
7.5.2 Configuring boilers in cascade + 1 direct circuit + 1 underfloor heating circuit + 1 domestic hot water tank . .
65
7.5.3 Configuring control of a boiler in 0/10V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
7.5.4 Configuring a lead boiler and the secondary boilers in a cascade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
8 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
8.1 Use of the control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
8.1.1 Modifying the user parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
8.1.2 Modifying the installer parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
8.2 Starting up the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
8.3 Stopping the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
8.3.1 Putting the boiler in Standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
8.4 Frost Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
8.4.1 Activating Protection mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
9 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
9.1 List of parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
9.1.1 Shortcuts menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
9.1.2 Information menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
Contents
47609474 - v02 - 04092014

9.1.3 List of user parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
9.1.4 List of installer parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
9.2 Setting the parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
9.2.1 Setting the date and time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86
9.2.2 Language selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
9.2.3 Changing the operating mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
9.2.4 Forcing domestic hot water production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
9.2.5 Setting the room temperature set point (O
On mode
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
9.2.6 Modifying the domestic hot water production mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
9.2.7 Setting the domestic hot water temperature set point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
9.2.8 Setting the room temperature set point (Reduced mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
9.2.9 Programming a Holiday period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
9.2.10 Using the boiler according to thermal output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
9.2.11 Selecting a heating circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
9.2.12 Locking / Unlocking parameter modification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
9.2.13 Timer programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
9.2.14 Setting a temporary heating flow temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
9.2.15 Managing boilers in cascade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
9.3 Accessing the information menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
10 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
10.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
10.2 Standard inspection and maintenance operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
10.2.1 Performing the annual service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
10.2.2 Removing the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
10.2.3 Cleaning the heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109
10.2.4 Checking the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
10.2.5 Cleaning the siphon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
10.2.6 Remounting the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
10.2.7 Check the combustion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
11 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .116
11.1 Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
11.1.1 Automatic error code clearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
11.1.2 Clearing error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
12 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
12.1 Decommissioning procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .118
12.2 Recommissioning procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .118
13 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
13.1 Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Contents
7609474 - v02 - 04092014 5

1 Safety
1
1.1 General safety instructions
Danger
If you smell gas:
1. Do not use a naked flame, do not smoke, do not
operate electrical contacts or switches (doorbell,
light, motor, lift, etc.).
2. Shut off the gas supply.
3. Open the windows.
4. Trace possible leaks and seal them immediately.
5. If the gas leak is before the gas meter, contact the
gas supplier.
Danger
If you smell flue gases:
1. Switch off the appliance.
2. Open the windows.
3. Trace possible leaks and seal them immediately.
Warning
Do not touch the flue gas pipes. Depending on the
boiler settings, the temperature of the flue gas pipes
may exceed 60°C.
Warning
Do not touch the radiators for long periods. Depending
on the boiler settings, the temperature of the radiators
may exceed 60°C.
Warning
Take precautions with the domestic hot water. De
pending on the boiler settings, the domestic hot water
temperature may exceed 65°C.
Danger of electric shock
Before any work, switch off the mains supply to the
boiler.
1.2 Recommendations
Note
Keep this document close to the place where the ap
pliance is installed.
Note
Never remove or cover labels and data plates affixed
to the appliances. Labels and data plates must be
legible throughout the entire lifetime of the appliance.
Immediately replace damaged or illegible instructions
and warning stickers.
1 Safety
67609474 - v02 - 04092014

C
Caution
The appliance should be on Summer or Antifreeze
mode rather than switched off to guarantee the follow
ing functions:
Anti-blocking of pumps
Frost Protection
Caution
If the home is unoccupied for a long period and there
is a risk of frost, drain the boiler and the heating sys
tem.
Caution
To enjoy warranty cover, no modifications must be
made to the appliance.
Caution
The frost protection does not work if the boiler is
switched off.
Caution
The integrated protection system only protects the
boiler, not the heating installation
Note
Remove the casing only to perform maintenance and
repair work. Put the casing back in place after mainte
nance and repair work.
Warning
Only qualified professionals are authorised to work on
the boiler and the heating installation.
Note
Keep the boiler accessible at all times.
Caution
Installation of the boiler must be done by a qualified
professional in accordance with prevailing local and
national regulations.
Caution
Install the boiler in a frost-free location.
Caution
Do not stock chloride or fluoride compounds close to
the boiler. They are particularly corrosive and may
contaminate the combustive air. Chloride and fluoride
compounds are present in aerosol sprays, paints, sol
vents, cleaning products, washing products, deter
gents, glues, snow clearing salts.
Caution
Do not neglect to service the boiler. Contact a quali
fied professional or subscribe to a maintenance con
tract for the annual servicing of the boiler.
1 Safety
7609474 - v02 - 04092014 7

N
Note
Regularly check the presence of water and pressure
in the heating installation.
Caution
Maintenance work must be carried out by a qualified
professional.
Caution
Only a qualified professional is authorised to clean the
inside of the boiler.
Caution
Only genuine spare parts may be used.
Caution
After maintenance or repair work, check the entire
heating installation to ensure that there are no leaks.
Warning
Ensure correct earthing.
Install the appliance on a solid, stable structure able
to bear its weight.
Warning
Removal and disposal of the boiler must be carried
out by a qualified installer in accordance with local
and national regulations
Caution
If the power cable is damaged, it must be replaced by
the manufacturer, its after sales service or persons
with similar qualifications in order to obviate any dan
ger.
1.3 Liabilities
1.3.1 Installer's liability
The installer is responsible for the installation and initial com
missioning of the appliance. The installer must abide by the
following instructions:
Read and follow the instructions given in the manuals pro
vided with the appliance.
Install the appliance in compliance with prevailing legisla
tion and standards.
Carry out initial commissioning and any checks necessary.
Explain the installation to the user.
If maintenance is necessary, warn the user of the obliga
tion to check the appliance and keep it in good working or
der.
Give all the instruction manuals to the user.
1 Safety
87609474 - v02 - 04092014

1
1.3.2 Manufacturer's liability
Our products are manufactured in compliance with the re
quirements of the various Directives applicable. They are
therefore delivered with the marking and any documents
necessary. In the interests of the quality of our products, we
strive constantly to improve them. We therefore reserve the
right to modify the specifications given in this document.
Our liability as manufacturer may not be invoked in the fol
lowing cases:
Failure to abide by the instructions on installing the appli
ance.
Failure to abide by the instructions on using the appliance.
Faulty or insufficient maintenance of the appliance.
1 Safety
7609474 - v02 - 04092014 9

2 About this manual
2
2.1 General
This manual is intended for the installer of a POWER HT + boiler.
2.2 Symbols used
2.2.1 Symbols used in the manual
This manual uses various danger levels to draw attention to special in
structions. We do this to improve user safety, to prevent problems and to
guarantee correct operation of the appliance.
Danger
Risk of dangerous situations resulting in serious personal injury.
Danger of electric shock
Risk of electric shock.
Warning
Risk of dangerous situations resulting in minor personal injury.
Caution
Risk of material damage.
Note
Please note: important information.
See
Reference to other manuals or pages in this manual.
2.2.2 Symbols used on the appliance
1
Alternating current.
2
Protective earthing.
3
Before installing and commissioning the appliance, carefully read
the instruction manuals provided.
4
Dispose of used products through an appropriate recovery and re
cycling structure.
5
Caution: danger of electric shock, live parts. Disconnect the mains
power prior to carrying out any work.
2.3 Abréviations
Hi
Lower heating value (LHV)
Hs
Higher heating value (HHV)
PCU
PCB for managing burner operation
SU
Safety PCB
Fig.1 Symbols used on the appliance
1 2
MW-2000068-1
1
2
3
4
5
2 About this manual
10 7609474 - v02 - 04092014

3 Technical specifications
3
3.1 Homologations
3.1.1 Directives
This product has been manufactured and put into circulation in accord
ance with the requirements and standards of the following European Di
rectives:
Gas Directive 2009/142/EC
Pressure Equipment Directive 97/23/EC, Article 3, paragraph 3
Electromagnetic Compatibility Directive 2004/108/EC
Generic standards: EN 61000-6-3, EN 61000-6-1
Standard referred to: EN 55014
For appliances connected to the electricity network:
Abide by the prevailing regulations for low voltage electrical appliances.
Low Voltage Directive 2006/95/EC
Generic standard: EN 60335–1
Standard referred to: EN 60335–2–102
Efficiency Directive 92/42/EC
Apart from the legal provisions and Directives, the additional Directives de
scribed in these instructions must also be observed.
For all provisions and Directives referred to in these instructions, it is
agreed that all addenda or subsequent provisions will apply at the time of
installation.
3.1.2 Certifications
We hereby certify that the series of appliances specified below complies
with the standard model described in the CE declaration of conformity.
CE number CE-0085CP0089
NOx classification Class 5
Type of flue gas connection B23 – B23P
C13
C33
C43
C53
C63
C83
3.2 Technical data
Tab.1 General
Boiler speed Unit POWER
HT+ 1.50
POWER
HT+ 1.70
POWER
HT+ 1.90
POWER HT
+ 1.110
Useful output at 80/60°C
Heating mode Minimum kW 5.0 7.2 9.4 11.4
Useful output at 80/60°C
Heating mode Maximum kW 45 65 85 102
Useful output at 50/30 °C
Heating mode Minimum kW 5.4 7.8 10.2 12.3
Useful output at 50/30 °C
Heating mode Maximum kW 48.6 70.2 91.8 110.2
Heating flow rate - Hi
Heating mode Minimum kW 5.1 7.4 9.7(1) 11.7
Heating flow rate - Hi
Heating mode Maximum kW 46.3 66.9 87.4 104.9
3 Technical specifications
7609474 - v02 - 04092014 11

Boiler speed Unit POWER
HT+ 1.50
POWER
HT+ 1.70
POWER
HT+ 1.90
POWER HT
+ 1.110
Heating flow rate - Hs
Heating mode Minimum kW 5.6 8.2 10.7 12.9
Heating flow rate - Hs
Heating mode Maximum kW 51.4 74.2 97.0 116.4
Efficiency at 80/60 °C - Hi
Heating mode under full load Maximum % 97.4 97.2 97.3 97.2
Efficiency at 50/30 °C - Hi Heating mode un
der full load % 105.0 105.0 105.5 105.1
Efficiency - Hi - Return temperature
30 °C
Heating mode un
der part load % 108.4 108.1 108.2 108.1
(1) The heat output with G31 gas is different and is 12.5 kW
Tab.2 Characteristics of the heating circuit
Unit POWER HT+
1.50
POWER HT+
1.70
POWER HT+
1.90
POWER HT+
1.110
Water content (excluding expansion vessel) litre 2.81 4.98 8.34 9.83
Minimum operating pressure kPa (bar) 0.5 0.5 0.5 0.5
Maximum operating pressure (MOP) kPa (bar) 4 4 4 4
Maximum water temperature °C 85 85 85 85
Maximum operating temperature °C 80 80 80 80
Tab.3 Data on the gases and combustion gases
For gas flow rates at 15°C and
1013.25 hPA
Boiler speed Unit POWER HT
+ 1.50
POWER HT
+ 1.70
POWER HT
+ 1.90
POWER HT
+ 1.110
Consumption of natural gas H (G20) Minimum m³/h 0.54 0.78 1.03 1.24
Consumption of natural gas H (G20) Maximum m³/h 4.90 7.07 9.25 11.10
Consumption of natural gas E (G20) Minimum m³/h 0.54 0.78 1.03 1.24
Consumption of natural gas E (G20) Maximum m³/h 4.90 7.07 9.25 11.10
Consumption of natural gas L (G25) Minimum m³/h 0.63 0.91 1.19 1.44
Consumption of natural gas L (G25) Maximum m³/h 5.69 8.22 10.75 12.91
Consumption of natural gas LL (G25) Minimum m³/h 0.63 0.91 1.19 1.44
Consumption of natural gas LL (G25) Maximum m³/h 5.69 8.22 10.75 12.91
Consumption of Propane (G31) Minimum Kg/h 0.40 0.57 0.97 0.91
Consumption of Propane (G31) Maximum Kg/h 3.59 5.19 6.79 8.15
NOx emission according to EN297A3 Class 5 mg/kWh 29.8 34.8 39.5 24.7
Flue gas mass flow rate (G20) Minimum Kg/h 7.2 14.4 18 18
Flue gas mass flow rate (G20) Maximum Kg/h 75.6 111.6 144 169.2
Maximum flue gas temperature Minimum °C 92 76 70 70
Maximum counter-pressure (B23p) Pa 200 200 200 200
Tab.4 Electrical characteristics
Unit POWER HT+
1.50
POWER HT+
1.70
POWER HT+
1.90
POWER HT+
1.110
Power supply voltage VAC 230V 50Hz 230V 50Hz 230V 50Hz 230V 50Hz
Maximum absorbed power - Full load W 100 117 146 185
Maximum absorbed power - Part load W 24 24 24 24
3 Technical specifications
12 7609474 - v02 - 04092014

Unit POWER HT+
1.50
POWER HT+
1.70
POWER HT+
1.90
POWER HT+
1.110
Maximum absorbed power - Stand-by W 2.7 3 3 3
Tab.5 Other characteristics
Unit POWER HT+
1.50
POWER HT+
1.70
POWER HT+
1.90
POWER HT+
1.110
Electrical protection class IP21 IP21 IP21 IP21
Weight empty Kg 60 70 104 109
3.2.1 Sensor characteristics
Tab.6 Heating flow sensor and return sensor
Temperature (in °C) 30 65 85
Resistance (in ohms) 8060 2085 1070
3.3 Dimensions and connections
Fig.2 Dimensions and connections POWER HT+ 1.50 and POWER HT+ 1.70
600
440
247
848
56
681
212
42065
905
586
555
440
371
271
147
98
173
(1)
MW-3000001
1
2
4
3
1
Heating circuit return (G1")
2
Heating circuit flow (G1")
3
Gas inlet (G3/4”)
4
Condensate discharge (DN18)
(1)
Adjustable feet
3 Technical specifications
7609474 - v02 - 04092014 13

Fig.3 Dimensions and connections POWER HT+ 1.90 and POWER HT+ 1.110
1127
600
440
94
300300
681
107
420
65
271
371
546
621
699
737
177
98
62
54
1222
(1)
MW-3000002
1
2
3
4
1
1
Heating circuit return (G1-1/2")
2
Heating circuit flow (G1-1/2")
3
Gas inlet (G1")
4
Condensate discharge (DN18)
(1)
Adjustable feet
3 Technical specifications
14 7609474 - v02 - 04092014

3
3.4 Electrical diagram
Fig.4 Electrical diagram POWER HT+ 1.50 – POWER HT+ 1.70
1
2
3
4
Aux 1-2 230 V TA TS
LN LN L LNNLNLN
O
N
P
L
K
J
I
M
H
G
F
E
L
N
A
C
B
D
3
4
1A
2A
1
1
2
2
11
10 12 9
8
7
6
1
2
3
4
HMI
5
MW-3000003-01
A
Power supply 230V 50Hz
B
Power supply auxiliary circuit 1
C
Power supply auxiliary circuit 2
D
Room thermostat
E
Heating circuit pump
F
Domestic hot water pump
G
Safety contact
H
Boiler pump
I
Auxiliary sensor 1
J
Auxiliary sensor 2
K
Outside temperature sensor
L
Domestic hot water sensor
M
Room temperature sensor 1
N
Room temperature sensor 2
O
Room temperature sensor 3
P
Boiler pump modulation (PWM)
1
Flow temperature sensor
2
Return sensor
3
Hydraulic pressure sensor
4
Flue gas sensor
5
Control panel display
6
Ionisation probe
7
Spark plug
8
Igniter
9
Gas valve
10
Safety thermostat
11
Fan
12
Safety thermostat on the combustion chamber door
3 Technical specifications
7609474 - v02 - 04092014 15

Fig.5 Electrical diagram POWER HT+ 1.90 – POWER HT+ 1.110
1
2
3
4
Aux 1-2 230 V TA TS
LN LN L LNNLNLN
O
N
P
M
L
K
J
I
H
G
F
E
L
N
A
C
B
D
3
4
1A
2A
1
1
2
2
11 10 12
9
8
7
6
1
2
3
4
HMI
5
MW-3000004-01
A
A
Power supply 230V 50Hz
B
Power supply auxiliary circuit 1
C
Power supply auxiliary circuit 2
D
Room thermostat
E
Heating circuit pump
F
Domestic hot water pump
G
Safety contact
H
Boiler pump
I
Auxiliary sensor 1
J
Auxiliary sensor 2
K
Outside temperature sensor
L
Domestic hot water sensor
M
Room temperature sensor 1
N
Room temperature sensor 2
O
Room temperature sensor 3
P
Boiler pump modulation (PWM)
1
Flow temperature sensor
2
Return sensor
3
Hydraulic pressure sensor
4
Flue gas sensor
5
HMI Text display
6
Ionisation probe
7
Spark plug
8
Igniter
9
Gas valve
10
Safety thermostat
11
Fan
12
Thermal fuse
13
Safety thermostat on the combustion chamber door
3 Technical specifications
16 7609474 - v02 - 04092014

4 Description of the product
4
4.1 General description
POWER HT + floor-standing condensing gas boilers have the following
characteristics:
Low pollutant emissions
High efficiency heating
Electronic control panel
Flue gas discharge by a forced flue, chimney or bi-flow type connection.
Perfectly suitable for cascade systems with several boilers.
4.2 Operating principle
4.2.1 Gas/air setting
The casing fitted to the boiler is also used as an air box. Air is sucked in by
the fan and gas injected into the Venturi by the fan intake. The fan speed
is modulated according to the settings, the thermal energy requirement
and the actual temperatures measured by the temperature sensors. The
gas and air are mixed in the Venturi. The gas/air ratio command function
accurately adjusts the quantities of gas and air required. This provides op
timum combustion over the entire output range. The gas/air mixture is sent
to the burner, located upstream of the thermal exchanger.
4.2.2 Low-loss header (accessory)
The low-loss header is used to prevent interaction between the dynamic
pressures within the boiler and the heating circuits. Thanks to the low-loss
header, the dynamic pressures of the circulation pumps on the various cir
cuits are only added or subtracted to a lesser extent.
4 Description of the product
7609474 - v02 - 04092014 17

Fig.7 Functional diagram of a boiler with a low-loss header
MW-1000021-02
1
78
5
4
3
69
2
1
1
Low-loss header (accessory)
2
Air vent
3
Safety valve
4
Modulating circulation pump
5
Drain valve
6
Heating circuit flow
7
Heating circuit return
8
Boiler
9
Low-loss header kit
4.2.3 System in cascade
The boiler is ideally suited for a cascade system configuration. Use a boil
er/cascade connection kit to connect boilers in cascade.
Fig.6 Boiler equipped with the low-loss
header kit
MW-3000144-01
4 Description of the product
18 7609474 - v02 - 04092014

N
Note
Please contact us for further information.
4.2.4 Settings and safety devices
Note
The settings and safety devices are only operational if the boiler is
powered up.
Tab.7 Description of the safety devices
Device Description
Safety thermostats The safety thermostats suspend the supply of gas to the burner if the water in the pri
mary circuit overheats. To resume normal operation of the boiler, eliminate the cause of
this interruption.
Caution
The safety thermostats must in no circumstances be switched off or
disconnected.
NTC flue gas sensor The control panel blocks the gas supply to the burner in the event of overheating. To
resume normal operation of the boiler, switch off the boiler and switch it back on again
with the ON/OFF switch.
Flame detector by ionisation The boiler is put into safety shut-down in the event of gas shortage or incomplete inter
ignition on the burner.
Hydraulic pressure switch Thanks to this device, the burner can only operate if the system pressure is higher than
0.5 bar (50 kPa).
When the pressure switch detects a pressure lower than 0.8 bar (80 kPa), a warning
message is displayed, without stopping the heating pump.
Post-circulation pump After the burner stops, depending on the room thermostat setting and if in heating
mode, the heating pump runs for a further 3 minutes.
Antifreeze fluid device When the flow temperature is lower than 5°C, the burner starts up and runs until the
flow temperature reaches 15°C. This device runs under the following conditions:
The boiler is switched on
The gas supply is working
The pressure in the system is higher than 0.5 bar
Anti-blocking of the pump If there are no heating or domestic hot water requirements for 24 consecutive hours, the
pumps start up automatically and run for 10 seconds.
The pumps connected directly to the appliance's terminal blocks are started up every
Friday at 10:00 a.m. and run for 30 seconds.
Anticipatory start-up of the circula
tion pumps
In heating mode only, the appliance can start up the circulation pumps before burner ig
nition. The duration and activation of anticipatory start-up depends on the conditions of
installation and the operating temperatures. The duration of anticipatory start-up of the
circulation pumps therefore varies from a few seconds to several minutes.
Fig.8 Boilers in cascade
MW-3000145-01
4 Description of the product
7609474 - v02 - 04092014 19

4
4.3 Main components
Fig.9 POWER HT+ 1.50 and POWER HT+ 1.70
MW-3000116-01
1
2
7
8
24
20
4322 9
10
11
21
12
13
14
6
15
16
1923
18
17
5
1
Control panel
2
Flue gas measuring point
3
Flue gas connection
4
Power supply terminal block
5
Terminal block for the sensors and the remote con
trol
6
Controller PCB
7
Gas valve
8
Burner
9
Flue gas fitting
10
Automatic air vent
11
Return sensor
12
Safety thermostat
13
Condensate siphon
14
Drain valve
15
Hydraulic pressure sensor
16
Igniter
17
Spark plug
18
Ionisation probe
19
Flame inspection window
20
Flue gas sensor
21
Flow temperature sensor
22
Emplacement for two AVS 75 boards maximum. A
third AVS 75 board can be used by the boiler but
must be fixed to the wall and powered externally.
23
Emplacement for OCI 345 board
Caution
Danger of short circuit on the OCI 345 board if
it is fixed in another emplacement.
24
Safety thermostat on the combustion chamber door
Fig.10 POWER HT+ 1.90 and POWER HT+ 1.110
MW-3000117-01
1
23
2022
5
6
4
9
10
11
21
14
15
16
12
13
7
8
24
19
23
18
17
1
Control panel
2
Flue gas measuring point
3
Flue gas connection
4
Power supply terminal block
5
Terminal block for the sensors and the remote con
trol
6
Controller PCB
7
Gas valve
8
Burner
9
Flue gas fitting
10
Automatic air vent
11
Return sensor
4 Description of the product
20 7609474 - v02 - 04092014