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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 Tools required for installation 9
3.2 Introduction 9
3.3 Venting 9
3.4 Combustion air requirements 20
3.5 Proper location for installing your heater 21
3.6 Heater placement and clearances 21
3.7 Mounting installation 21
3.8 Gas piping & connections 22
3.9 Water connections 25
3.10 Water quality 25
3.11 Domestic hot water recirculation 26
3.12 Measuring gas pressure 27
4 Electrical connections 28
4.1 Electrical power supply 28
4.2 Position of the fuses in control unit 28
5 Operation instructions 29
5.1 LCD Display functions 29
5.2 For your safety read before operating
your water heater 30
5.3 Power 30
5.4 Temperature selection 30
5.5 Use of optional remote control accessory
(part no. TSTAT2) 31
5.6 Operation 31
5.7 Reset button 31
5.8 Program button 31
5.9 Locked condition 31
6 Maintenance and service 32
6.1 Annual maintenance 32
6.2 Winterizing for seasonal use 32
6.3 Mineral scale build-up 33
6.4 Adjusting CO2 (carbon dioxide) 33
6.5 Program values 36
6.6 Control board diagnostics 37
7 Troubleshooting 38
7.1 Introduction 38
7.2 Burner do not ignite when hot water
is turned ON 38
7.3 Water is too hot 38
7.4 Water is not hot enough 38
7.5 Low water flow/pressure 39
7.6 Hot water temperature fluctuates at tap 39
7.7 Noisy burner/heater during operation 39
8 Problem solving 41
8.1 Error code diagnostics 41
9 Electrical diagram 45
10 Sensor resistance charts 46
11 GWH 2700 ES Functional scheme 48
12 Interior components diagram
and parts list 49
12.1 Interior components 49
12.2 Components diagram 51
13 Protecting the environment 57
14 Limited Warranty 58