Bosch 520-PN-L Specifications download pdf (Page 2)

6 720 644 942 (2014/11) 520 HN

2 | Index

Index

1 Key to symbols and safety instructions . . . . . . . . . . . . 3

1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2 General safety instructions . . . . . . . . . . . . . . . . . . . 3

2 Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Appliance details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.1 520 HN specifications (Technical data) . . . . . . . . 7

3.2 Unpacking the 520 HN heater . . . . . . . . . . . . . . . . 8

3.3 General rules to follow for safe operation . . . . . . . 8

3.4 Dimensions and installation clearances . . . . . . . . 10

4 Installation instructions . . . . . . . . . . . . . . . . . . . . . . . . 11

4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.2 Proper location for installing your heater . . . . . . 11

4.3 Mounting Heater . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.4 Combustion air requirements . . . . . . . . . . . . . . . . 13

4.5 Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.5.1Horizontal venting . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.5.2Vertical venting . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.6 Gas piping & connections . . . . . . . . . . . . . . . . . . . 16

4.7 Measuring gas pressure . . . . . . . . . . . . . . . . . . . . 20

4.8 Water connections. . . . . . . . . . . . . . . . . . . . . . . . 20

4.9 Recirculation application . . . . . . . . . . . . . . . . . . . 21

5 Operation instructions . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.1 For your safety read before operating

your water heater . . . . . . . . . . . . . . . . . . . . . . . . . 21

5.2 Lighting instructions . . . . . . . . . . . . . . . . . . . . . . . 21

5.3 To turn off appliance . . . . . . . . . . . . . . . . . . . . . . . 22

5.4 Adjusting the water temperature . . . . . . . . . . . . . 22

5.5 Power adjustment knob . . . . . . . . . . . . . . . . . . . . 23

5.6 Draining the appliance . . . . . . . . . . . . . . . . . . . . . 23

6 Maintenance and service . . . . . . . . . . . . . . . . . . . . . . . 24

6.1 Maintenance intervals . . . . . . . . . . . . . . . . . . . . . . 24

6.2 Water valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6.3 Pilot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.4 Main burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

6.5 Vent assembly / heat exchanger . . . . . . . . . . . . . . 25

6.6 Mineral scale build-up . . . . . . . . . . . . . . . . . . . . . . 25

6.6.1Descaling heat exchanger . . . . . . . . . . . . . . . . . . . 25

7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7.2 No spark at pilot with water flow . . . . . . . . . . . . . 26

7.3 Spark appears when hot water is turned on,

but pilot and burners will not ignite . . . . . . . . . . . 26

7.4 Pilot lights, but burners will not come on . . . . . . 27

7.5 Main burners go out during hot water use . . . . . . 28

7.6 Hot water temperature fluctuates at tap . . . . . . . 28

7.7 Water is too hot . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7.8 Water is not hot enough . . . . . . . . . . . . . . . . . . . . 29

7.9 Burners ignite without hot water flow . . . . . . . . . 29

7.10 Low hot water pressure . . . . . . . . . . . . . . . . . . . . 29

7.11 Noise when heater is running . . . . . . . . . . . . . . . . 30

7.12 Burners do not operate cleanly; yellow flames

when operating . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

8 Protecting the environment . . . . . . . . . . . . . . . . . . . . 30

9 Interior components and diagram parts list . . . . . . . 31

9.1 Interior components . . . . . . . . . . . . . . . . . . . . . . . 31

9.2 Components diagram . . . . . . . . . . . . . . . . . . . . . . 32

9.3 Parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

10 LIFETIME LIMITED WARRANTY FOR BOSCH TANKLESS

WATER HEATERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

11 Installer Checklist to be completed by installer upon

installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

1 2 3 4 5 6 7 ... 35 36

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Bosch 520-PN-L Specifications Page 2

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