Installation Manual

6 720 644 930
2
Index
Index
1 Warning 3
2 Appliance details 4
2.1 Features 4
2.2 Specifications (Technical data) 5
2.3 Unpacking the heater 6
2.4 General rules to follow for safe operation 7
2.5 Dimensions and Minimum
installation clearances 8
3 Installation instructions 9
3.1 Specialized tools 9
3.2 Introduction 9
3.3 Venting 9
3.4 Combustion air requirements 23
3.5 Proper location for installing your heater 23
3.6 Heater placement and clearances 24
3.7 Mounting installation 24
3.8 Gas piping & connections 25
3.9 Water connections 28
3.10 Water quality 28
3.11 Domestic hot water recirculation 29
3.12 Space heating applications 30
3.13 Measuring gas pressure 32
4 Electrical connections 33
4.1 Electrical power supply 33
4.2 Position of the fuses in control unit 33
5 Operation instructions 34
5.1 Description LCD display 34
5.2 For your safety read before operating
your water heater 35
5.3 Power 35
5.4 Temperature selection 35
5.5 Use of optional remote control accessory
(part no. TSTAT2) 36
5.6 Operation 36
5.7 Reset button 36
5.8 Program button 36
5.9 Locked condition 37
6 Maintenance and service 37
6.1 Annual maintenance 37
6.2 Winterizing for seasonal use 38
6.3 Mineral scale build-up 38
6.4 Adjusting CO2 39
6.5 Program values 41
6.6 Diagnostic menu 42
7 Troubleshooting 43
7.1 Introduction 43
7.2 Burner do not ignite when hot water
is turned ON 43
7.3 Water is too hot 43
7.4 Water is not hot enough 43
7.5 Low water flow/pressure 44
7.6 Hot water temperature fluctuates at tap 44
7.7 Noisy burner/heater during operation 44
8 Problem solving 46
8.1 Error code diagnostics 46
9 Electrical diagram 50
10 Sensor resistance charts 51
11 Functional scheme 53
12 Interior components diagram
and parts list 54
12.1 Interior components 54
12.2 Components diagram 56
13 Protecting the environment 62
14 Limited Warranty 63