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2
Index
Index
1 Warning 3
2 Appliance details 4
2.1 Features 4
2.2 GWH 715 ES Specifications (Technical data) 5
2.3 Unpacking the GWH 715 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 21
3.5 Proper location for installing your heater 21
3.6 Heater placement and clearances 22
3.7 Mounting installation 22
3.8 Gas piping & connections 23
3.9 Water connections 26
3.10 Water quality 26
3.11 Domestic hot water recirculation 27
3.12 Measuring gas pressure 28
4 Electrical connections 29
4.1 Electrical power supply 29
4.2 Position of the fuses in control unit 29
5 Operation instructions 30
5.1 Description LCD display 30
5.2 For your safety read before operating
your water heater 31
5.3 Power 31
5.4 Temperature selection 31
5.5 Use of optional remote control accessory
(part no. TSTAT2) 32
5.6 Operation 32
5.7 Reset button 32
5.8 Program button 32
5.9 Locked condition 33
6 Maintenance and service 33
6.1 Annual maintenance 33
6.2 Winterizing for seasonal use 34
6.3 Mineral scale build-up 34
6.4 Adjusting CO
2
35
6.5 Program values 37
6.6 Control board diagnostics 38
7 Troubleshooting 39
7.1 Introduction 39
7.2 Burner do not ignite when
hot water is turned ON 39
7.3 Water is too hot 39
7.4 Water is not hot enough 39
7.5 Low water flow/pressure 40
7.6 Hot water temperature fluctuates at tap 40
7.7 Noisy burner/heater during operation 40
8 Problem solving 42
8.1 Error code diagnostics 42
9 Electrical diagram 46
10 Sensor resistance charts 47
11 GWH 715 ES Functional scheme 49
12 Interior components diagram
and parts list 50
12.1 Interior components 50
12.2 Components diagram 52
13 Protecting the environment 58
14 Limited Warranty 59
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