Bosch 520-PN-L Operation Manual Download Page 25 | Manualshive

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Interior components and diagram parts list

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Interior components and diagram parts list

8.1

Interior components

Fig. 28 Functional scheme

4

Heat exchanger

5

Burner

10

Temperature adjustment selector

11

Water valve

20

Gas connection

22

Flexible hot outlet

26

Gas control slide

30

Pilot gas tubing

102

Piezo

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Summary of Contents for 520-PN-L

Page 1: ...ry or property damage Refer to this manual For assistance or additional information consult a qualified installer service agency or the gas supplier In the Commonwealth of Massachusetts this product must be installed by a licensed plumber or gas fitter Upon completion of the installation these instructions should be handed to the user of the appliance for future reference What to do if you smell g...

Page 2: ...17 4 5 Draining water from heater 17 5 Maintenance and service 18 5 1 Maintenance intervals 18 5 2 Water valve 18 5 3 Pilot 18 5 4 Main burners 19 5 5 Vent assembly heat exchanger 19 5 6 Mineral scale build up 19 6 Troubleshooting 20 6 1 Introduction 20 6 2 Pilot does not light 20 6 3 Pilot lights but goes out when button is released 20 6 4 Pilot goes out during or after hot water use 20 6 5 Burne...

Page 3: ...om the gas supply piping system during any pressure testing of that system at test pressures equal to or more than 0 5 psig Caution Any changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment ...

Page 4: ...Water valve material Fibreglass reinforced polyamide PA Minimum water flow 0 5 gallon minute 1 9 l m Minimum recommended water pressure 30 PSI 2 07 bar Connections Bottom of heater Dimensions 520 PN Depth in 8 66 220 mm Width in 16 73 425 mm Height in 25 75 655 mm Weight 35 pounds 16 kg Gas types Natural Gas LP Gas Safety devices Flame failure device ionization flame rod sensor Pressure relief val...

Page 5: ...l Gas Code ANSI Z223 1 NFPA 54 In Canada The Installation should conform with CGA B149 1 2 INSTALLATION CODES and or local installation codes 2 Carefully plan where you install the heater Proper clearances must be followed 3 The appliance must be isolated from the gas supply piping system by closing its individual manual gas shutoff valve not supplied with heater during any pressure testing at pre...

Page 6: ...7 Hole for fixing to wall 38 Exhaust pipe to wall 39 Draught diverter with flue gas monitor 40 Gas valve 49 Observation window 102 Piezo Fig 4 Minimum clearances Model 520 PN TOP A 12 inches 306 mm FRONT B 4 inches 100 mm BACK 0 inches SIDES 4 inches 100 mm BOTTOM C 12 inches 306 mm Dimensions inches mm 520 PN A 16 73 425 B 25 75 655 C 13 15 334 D 5 11 130 E 21 25 540 F 2 55 65 G 1 18 30 H 3 4 Tab...

Page 7: ...erial For installations in an alcove or closet maintain the minimum clearances to combustible and non combustible materials listed below See also Fig 4 A Top 12 inches 306 mm B Front 4 inches 100 mm C Back 0 inches D Sides 4 inches 100 mm E Bottom 12 inches 306 mm Warning The water in this water heater is cold and always remains cold except for the times that hot water is being used DO NOT INSTALL...

Page 8: ...with plasterboard it is recommended that support board s either 1x4 s or 1 2 minimum plywood first be attached across a pair of studs and then the heater should be attached to the support boards see Fig 7 B Secure the two included L shaped hooks to wall studs or support board 13 1 4 apart See Fig 7 B Hang heater on two L shaped hooks See Fig 8 Fig 6 Remove front cover Fig 7 Support board Fig 8 Sec...

Page 9: ... per 1000 Btu per hour of the combined rating of all appliances installed in the space That would be 5850 cubic feet for the BOSCH 520 PN alone b Installations in structures that have been tightly constructed air infiltration rate of 0 40 ACH or less must be provided for combustion air per the National Fuel Gas Code Consult a HVAC specialist if your air infiltration rate is questionable Appliances...

Page 10: ... must be secured to each other with sheet metal screws and be properly supported Horizontal runs Any gas vent section that is greater than 45 degrees from the vertical is considered horizontal Horizontal sections must slope upwards at least inch for every foot of its horizontal length and be properly supported Keep the horizontal section short and avoid too many elbows The maximum horizontal run a...

Page 11: ...ipe check local codes for clarification The lining material must be listed for use only with naturally drafting draft hood equipped gas appliances Follow manufactures instructions for installation of listed lining material You may not vent any other fuel burning appliances into any free space remaining in the chimney The minimum vertical gas vent length within the masonry chimney should be no less...

Page 12: ...DE INSTALLATION The pressure regulator provided with the heater is adjusted to deliver the proper gas pressure as indicated on the rating plate and in the manual for altitude up to 2000 feet 660 meters above sea level On appliances being installed above 2000 ft 660 meters elevation the inlet gas pressure should be set at installation to the value shown below Note The gas pressures specified below ...

Page 13: ...e Drop of 0 5 Inch Water Column EHD Equivalent Hydraulic Diameter The greater the value of EHD the greater the gas capacity of the tubing Tube size inches EHD 10 20 30 40 50 60 1 2 18 EHD 82 58 47 41 37 34 3 4 23 EHD 161 116 96 83 75 68 1 30 EHD 330 231 188 162 144 131 1 1 4 37 EHD 639 456 374 325 292 267 Length of Flexible Corrugated Stainless Steel Tubing CSST Feet Tube size inches EHD 10 20 30 ...

Page 14: ... Never sweat any rigid piping directly to or beneath the water connections damage can occur to the internal water valve from heating of the pipe Plastics or other PEX type plumbing line materials are not recommended for connecting directly to the water heater Keep water inlet and outlet pipes to no less than 12 7mm diameter to allow the full flow capacity It is recommended that all water piping be...

Page 15: ...igniter to light the pilot burner When lighting the pilot follow these instructions exactly B What to do if you smell gas WHAT TO DO IF YOU SMELL GAS B Close gas valve Open windows B Do not try to light any appliance B Do not touch any electric switch do not use any phone in your building B Immediately call your gas supplier from a neighbors phone Follow the gas supplier s instructions B If you ca...

Page 16: ... down for at least 15 seconds with pilot burning before releasing When the gas valve button is released the pilot should continue to burn If the gas valve button does not pop out when released stop and immediately call your service technician or gas supplier If pilot does not stay lit repeat all steps If pilot will not stay lit after several tries slide the gas valve button all the way to the left...

Page 17: ...ng the knob clockwise will raise the temperature and lower the activation rate Gas control slide button The gas control slide button adjusts temperature by adjusting how much gas is allowed to flow to the burners As the slide is adjusted to the left the output temperature will lower with the lowest setting being the small flame position Fig 24 The hottest position is the highest flame position all...

Page 18: ...assembly and pulling the pipe free from the water valve Loosen the two set screws at the bottom of the water valve where it connects to the gas valve If the set screws are seized STOP and call Bosch tech support before proceeding Forcing and snapping seized set screws may cause irrevocable damage to the water valve and gas valve assemblies Remove the water valve by pulling it to the right Separate...

Page 19: ...lumbing system 4 Drain water from the unit s heat exchanger by disconnecting inlet and outlet water connections 5 Connect the line A from the outlet of the circulating pump installer supplied to the inlet water fitting on the water heater 6 Using another line B connect to the water outlet fitting on the water heater Route the other end of this line into a descaling reservoir 7 Using a 3rd line C f...

Page 20: ... switch models with Powervents only and the electromagnet See parts diagram for locations Clean sensor connections with light sandpaper if corrosion is evident The electromagnet connection is 5mm nut from the thermocouple which screws into a larger 17mm nut Tighten both nuts snugly but do not over tighten 5 Pilot flame should be blue in color and completely engulfing the tip of the thermocouple If...

Page 21: ...addition of too much cold will overpower and slow the flow within the tankless water heater decreasing it below activation point which shuts off the burners The end result is nothing but cold water coming out of the outlet Reduce the need for cold water mix by setting the gas slide control button towards the single flame position for lower hot water temperatures If the problem persists go to www b...

Page 22: ...lets i e showerheads faucet aerators and whole house filters are clear of debris Also the water heater s inlet filter screen should be inspected and cleaned see chapter 5 2 6 The water valve may be dirty prohibiting it from fully opening the gas valve This part needs to be periodically serviced every 2 5 yrs depending on water quality and use see chapter 5 2 7 Gas pressure is too low Ensure gas pr...

Page 23: ... pressure is in accordance with manufacturer s specifications see chapter 3 6 A gas pressure reading is needed to proceed further Contact your original installer or a licensed gas technician to obtain this reading 3 For proper combustion at high elevations the inlet gas pressure should be set at installation to the value shown in table 3 while operating at maximum BTU A gas pressure reading is nee...

Page 24: ...rature you want This way you have the precise water flow needed mixing cold water to regulate temperature will increase the water flow with consequent waste of water For increased safety shut off the appliance from the main water supply if your are staying away from home for a considerable time At below freezing temperatures disconnect the plumbing connections to the heater and allow the heater to...

Page 25: ...8 Interior components and diagram parts list 8 1 Interior components Fig 28 Functional scheme 4 Heat exchanger 5 Burner 10 Temperature adjustment selector 11 Water valve 20 Gas connection 22 Flexible hot outlet 26 Gas control slide 30 Pilot gas tubing 102 Piezo ...

Page 26: ... and diagram parts list 8 2 Components diagram Fig 29 Components Diagram 43 50 49 32 48 46 45 28 29 30 31 25 17 18 19 20 21 23 26 24 27 33 34 35 13 37 22 38 39 40 41 42 44 47 51 1 2 3 7 6720608126 02 2 JF 52 8 9 11 12 13 14 15 16 10 6 4 5 ...

Page 27: ...NG 8 708 500 358 0 22 Poppet valve head 3 LP 8 708 500 359 0 23 Electromagnet 8 707 201 028 0 24 Electromagnet cap 8 703 305 283 0 25 Valve operation housing 8 708 008 069 0 26 Guide plate 8 701 000 380 0 27 Gas pressure regulator LP 8 707 406 083 0 27 Gas pressure regulator NG 8 707 406 084 0 28 Water valve 8 707 006 344 0 29 Watervalve pushrod 10x 8 703 204 051 0 30 Diaphragm L 8 700 503 084 0 3...

Page 28: ...properly maintained by a qualified heating contractor and the other conditions of this warranty are met ITEMS NOT COVERED This limited warranty does not cover the following cir cumstances 1 Components or parts not provided by BTC 2 Serviceable items and normal maintenance as required per the Installation Manual 3 The workmanship of any installer BTC disclaims and does not assume any liability of a...

Page 29: ...nd exclusions may not apply to you WARRANTY CLAIMS PROCESS If you have a warranty claim you should notify the heat ing contractor who installed your Tank and ask that the contractor notify the distributor from whom the contrac tor purchased the Tank If this action is not possible or you don t receive a response contact Bosch Thermo technology Corp 50 Wentworth Avenue Londonderry NH 03053 To proces...

Page 30: ...6 720 644 947 30 Notes 10 Notes ...

Page 31: ...6 720 644 947 Notes 31 ...

Page 32: ...________________________________ Installer name_____________________________________________ Address_____________________________________________ Phone_____________________________________________ See Chapter 3 8 and gas pressure table to be filled out by installer Installation manual should be left with the owner after the installation is tested and completed BOSCH THERMOTECHNOLOGY CORP 50 Wentwo...

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