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Index
Index
1Warning 3
2 Appliance details 4
2.1 Features 4
2.2 GWH 2400 ES Specifications
(Technical data) 4
2.3 Unpacking the GWH 2400 ES heater 5
2.4 General rules to follow for safe operation 6
2.5 Dimensions and Minimum installation
clearances 7
3 Installation instructions 8
3.1 Tools required for installation 8
3.2 Introduction 8
3.3 Venting 8
3.4 Combustion air requirements 15
3.5 Proper location for installing your heater 16
3.6 Heater placement and clearances 16
3.7 Mounting installation 16
3.8 Gas piping & connections 17
3.9 Water connections 20
3.10 Water quality 20
3.11 Recirculation application 21
3.12 Measuring gas pressure 21
4 Electrical connections 23
4.1 Electrical power supply 23
4.2 Position of the fuses in control unit 23
5 Operation instructions 24
5.1 LCD Display functions 24
5.2 For your safety read before operating
your water heater 25
5.3 Power 25
5.4 Temperature selection 25
5.5 Use of optional remote control accessory
(part no. TSTAT2) 26
5.6 Operation 26
5.7 Reset button 26
5.8 Program button 26
5.9 Locked condition 26
6 Maintenance and service 27
6.1 Annual maintenance 27
6.2 Winterizing for seasonal use 27
6.3 Mineral scale build-up 28
6.4 Adjusting CO2 (carbon dioxide) 28
6.5 Program values 31
6.6 Control board diagnostics 32
6.7 Fan speed adjustment 33
7 Troubleshooting 35
7.1 Introduction 35
7.2 Burner do not ignite when hot water
is turned ON 35
7.3 Water is too hot 35
7.4 Water is not hot enough 35
7.5 Low water flow/pressure 36
7.6 Hot water temperature fluctuates at tap 36
7.7 Noisy burner/heater during operation 36
8 Problem solving 38
8.1 Error code diagnostics 38
9 Electrical diagram 42
10 Sensor resistance charts 43
11 GWH 2400 ES Functional scheme 45
12 Interior components diagram
and parts list 46
12.1 Interior components 46
12.2 Components diagram 48
13 Protecting the environment 54
14 Limited Warranty 55