6 720 644 951 (2014/11)
330 PN
2 | Index
Index
1 Key to symbols and safety instructions . . . . . . . . . . . . 3
1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Appliance details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 330 PN specifications (Technical data) . . . . . . . . 7
3.2 Unpacking the 330 PN heater . . . . . . . . . . . . . . . . 8
3.3 General rules to follow for safe operation . . . . . . . 8
3.4 Dimensions and installation clearances . . . . . . . . . 9
4 Installation instructions . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2 Proper location for installing your heater . . . . . . 10
4.3 Heater placement and clearances . . . . . . . . . . . . 11
4.4 Mounting Heater . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.5 Combustion air requirements . . . . . . . . . . . . . . . . 12
4.6 Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.6.1Horizontal venting . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.6.2Vertical venting . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.7 Gas piping & connections . . . . . . . . . . . . . . . . . . . 15
4.8 Measuring gas pressure . . . . . . . . . . . . . . . . . . . . 19
4.9 Water connections. . . . . . . . . . . . . . . . . . . . . . . . 19
4.10 Recirculation application . . . . . . . . . . . . . . . . . . . 20
5 Operation instructions . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1 For your safety read before operating your
water heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2 Lighting instructions . . . . . . . . . . . . . . . . . . . . . . . 21
5.3 To turn off appliance . . . . . . . . . . . . . . . . . . . . . . . 22
5.4 Setting the water temperature . . . . . . . . . . . . . . . 22
5.5 Draining water from heater . . . . . . . . . . . . . . . . . . 23
6 Maintenance and service . . . . . . . . . . . . . . . . . . . . . . . 23
6.1 Maintenance intervals . . . . . . . . . . . . . . . . . . . . . . 23
6.2 Water valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.3 Pilot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.4 Main burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.5 Vent assembly / heat exchanger . . . . . . . . . . . . . . 24
6.6 Mineral scale build-up . . . . . . . . . . . . . . . . . . . . . . 24
6.6.1Descaling heat exchanger . . . . . . . . . . . . . . . . . . . 24
7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.2 Pilot does not light . . . . . . . . . . . . . . . . . . . . . . . . 25
7.3 Pilot lights, but goes out when button is released 25
7.4 Pilot goes out during or after hot water use . . . . . 25
7.5 Burners do not light with water flow . . . . . . . . . . 26
7.6 Hot water temperature fluctuates at tap . . . . . . . 26
7.7 Water is too hot . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.8 Water is not hot enough . . . . . . . . . . . . . . . . . . . . 27
7.9 Burners ignite without hot water flow . . . . . . . . . 27
7.10 Low hot water pressure . . . . . . . . . . . . . . . . . . . . 27
7.11 Noise when heater is running . . . . . . . . . . . . . . . . 28
7.12 Burners do not operate cleanly; yellow flames
when operating . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8 Protecting the environment . . . . . . . . . . . . . . . . . . . . 28
9 Interior components and diagram parts list . . . . . . . 29
9.1 Interior components . . . . . . . . . . . . . . . . . . . . . . . 29
9.2 Components diagram . . . . . . . . . . . . . . . . . . . . . . 30
9.3 Parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
10 LIFETIME LIMITED WARRANTY FOR BOSCH
TANKLESS WATER HEATERS . . . . . . . . . . . . . . . . . . . 32
11 Installer Checklist to be completed by installer
upon installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Summary of Contents for 330-PN-L
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