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Index
Index
1Warning 3
2 Appliance details 4
2.1 Features 4
2.2 GWH 2400 ES Specifications
(Technical data) 5
2.3 Unpacking the GWH 2400 ES 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 17
3.5 Proper location for installing your heater 18
3.6 Heater placement and clearances 18
3.7 Mounting installation 18
3.8 Gas piping & connections 19
3.9 Water connections 22
3.10 Water quality 22
3.11 Domestic hot water recirculation 23
3.12 Measuring gas pressure 24
4 Electrical connections 26
4.1 Electrical power supply 26
4.2 Position of the fuses in control unit 26
5 Operation instructions 27
5.1 LCD Display functions 27
5.2 For your safety read before operating
your water heater 28
5.3 Power 28
5.4 Temperature selection 28
5.5 Use of optional remote control accessory
(part no. TSTAT2) 29
5.6 Operation 29
5.7 Reset button 29
5.8 Program button 29
5.9 Locked condition 29
6 Maintenance and service 30
6.1 Annual maintenance 30
6.2 Winterizing for seasonal use 30
6.3 Mineral scale build-up 31
6.4 Adjusting CO2 (carbon dioxide) 31
6.5 Program values 34
6.6 Control board diagnostics 35
6.7 Fan speed adjustment 36
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 2400 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
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