Bosch Tronic 5000C Manual de referencia

Technical Service Bulletin:

Polypropylene Heating Canister Replacement

Models: Bosch Tronic 5000C/6000C (WH27 Model Only) Electric Tankless Water Heater

Data subject to change without notice | Printed in the USA | BTC 722002312 A | 08.2021 Bosch Thermotechnology Corp.

Please read this entire document prior to proceeding with any work.

WARNING:

This bulletin is intended to provide technical guidance

to a professional who is qualiﬁed to work on 240V

electrical equipment. If you are not qualiﬁed to work on

such equipment, please obtain the services of such a

professional.

DANGER: HAZARDOUS VOLTAGE

The electrical supply to the water heater MUST be shutoﬀ

and isolated prior to commencing work!

NOTICE: PROPERTY DAMAGE

The water supply to the water heater must be shut oﬀ and

residual water drained prior to commencing work.

These directions assume that the product is installed in a location that

provides the installer with suﬃcient access to work. If that is not the case,

it may be necessary to uninstall the water heater completely prior to

commencing work.

Part Numbers

Description Part Number

Left Heating Canister Assembly 7738007199

Right Heating Canister Assembly 7738007198

Table 1

Replacing The Right-Hand Polypropylene Canister

1. Remove the two Phillips screws that secure the brass outlet water connector

to the water heater’s chassis (Fig.1).

Figure 1

2. Unscrew and remove the brass outlet water connector from the left black

polypropylene canister’s outlet pipe (Fig.2).

Figure 2

3. Remove the two Phillips screws and washers that secure the brass inlet water

connector to the water heater’s chassis (Fig.3).

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Technical Service Bulletin

2 | Tronic 5000C/6000C Polypropylene Heating Canister Replacement

Figure 3

4. Firmly hold the clear ﬂow transducer in place, and separate the brass water

inlet connector from it by gently pulling it down through the water heater’s

chassis (Fig.4). Be aware that an o-ring that is located at the bottom of

the ﬂow transducer will be creating some friction with the brass inlet

connection.

Figure 4

5. Remove the slotted brass screw and washer to disconnect the red wire from

the left tab of the thermal cutout switch that is mounted on top of the right

brass heating element assembly (Fig. 5).

Figure 5

6. Remove the two screws and washers that secure the thermal cutout switch

to the right brass heating element assembly (Fig.6).

Figure 6

7. Disconnect the short gray wire from the single TRIAC circuit board that is

mounted to the top of the right brass heating element assembly (Fig.7).

Figure 7

8. Disconnect the short pink wire and the short black wire from the dual TRIAC

circuit board that is mounted to the top of the right brass heating element

assembly (Fig.8).

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Technical Service Bulletin Tronic 5000C/6000C Polypropylene Heating Canister Replacement | 3

Figure 8

9. Remove the three screws and washers that secure the TRIAC circuit boards

to the top of the right brass heating element assembly (Fig.9).

Figure 9

10. Remove the TRIAC circuit boards and bracket from the top of the right brass

heating element assembly

Figure 10

11. Unplug the two circled wire connectors from the main circuit board that is

located in the lower-right corner of the water heater (Fig.11).

Figure 11

12. Remove the clear ﬂow transducer by pulling it down from the polypropylene

canister pipe, and remove the black temperature probe by removing two

screws and pulling the component out of the black pipe (Fig.12).

Figure 12

13. The black polypropylene canisters are secured to the chassis by ﬁve M4

ﬂange nuts (example shown in Fig.13). Remove all ﬁve nuts from the

threaded studs.

Figure 13

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Technical Service Bulletin

4 | Tronic 5000C/6000C Polypropylene Heating Canister Replacement

14. Separate the two black canisters from each other by rotating at the joint to

disengage the connection, and then pulling them apart (Fig.14).

Figure 14

15. Ensure that the o-ring is in place on the new right canister’s connector pipe

(Fig.15) and lubricate it with a small amount of silicone grease.

Figure 15

16. Connect the new right canister to the existing left canister and rotate to lock

into place (Fig.16).

Figure 16

17. Using the ﬁve M4 ﬂange nuts that were removed in Step 13, secure the

black polypropylene canisters back to the chassis’ threaded studs (Fig.17).

Figure 17

18. Insert the ﬂow transducer into the inlet connection pipe on the new

right black polypropylene canister, taking care to ensure that the ﬂow

transducer’s arrow is pointing UP in the direction of water ﬂow, and reinstall

the black temperature sensor using the two screws removed in Step 12 to

secure in place (Fig.18).

Figure 18

19. Plug the two wire connectors back into the main circuit board (Fig.19).

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Technical Service Bulletin Tronic 5000C/6000C Polypropylene Heating Canister Replacement | 5

Figure 19

20. Heat sink paste was supplied with the new black polypropylene canister,

apply it to the brass element assembly cap at the three locations outlined

below (Fig.20).

Figure 20

21. Place the triac circuit board back on top of the brass element assembly,

ensuring that the correct wires pass through the correct slots (Fig.21).

Figure 21

22. Secure the TRIAC circuit boards to the brass element assembly (Fig. 22)

using the three screws and washers that were removed in Step 9.

Figure 22

23. Reconnect the short pink wire and the short black wire to the dual TRIAC

circuit board (Fig.23).

Figure 23

24. Reconnect the short gray wire to the single TRIAC circuit board (Fig.24).

Figure 24

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Technical Service Bulletin

6 | Tronic 5000C/6000C Polypropylene Heating Canister Replacement

25. Use the two screws and washers that were removed in Step 6 to secure

the thermal cut out switch back on top of the right brass heating element

assembly, ensuring that ground wire is reconnected correctly (Fig.25).

Figure 25

26. Using the slotted brass screw and washer that was removed in Step 5,

reconnect the red wires to the left wiring tabs on the thermal cut out switch

(Fig.26).

Figure 26

27. Insert the brass outlet water connection ﬁtting up through the chassis and

screw it into the left black polypropylene pipe. Insert the brass inlet water

connection ﬁtting up through the chassis, apply some plumbers grease to

the o-ring that is located at the bottom of the ﬂow transducer, and gently

push the brass connector up to fully connect it to the ﬂow transducer (Fig.

27).

Figure 27

28. Use the two Phillips screws and washers that were removed in Step 3 to

secure the brass inlet water connection to the chassis (Fig.28).

Figure 28

29. Use the two Phillips screws and washers that were removed in Step 1 to

secure the brass outlet water connection to the chassis (Fig.29).

Figure 29

30. Reconnect the plumbing piping to the brass inlet and outlet water

connections, turn on the water supply, and check for leaks. If any are found,

shut the water supply oﬀ and correct the leak before turning on the power

supplies and putting the water heater back into operation.

31. Run the hot water for a few minutes to ensure correct operation.

Data subject to change without notice | Printed in the USA | BTC 722002312 A | 08.2021 Bosch Thermotechnology Corp.

Technical Service Bulletin Tronic 5000C/6000C Polypropylene Heating Canister Replacement | 7

Replacing The Left-Hand Polypropylene Canister

1. Remove the two Phillips screws that secure the brass outlet water connector

to the water heater’s chassis (Fig.30).

Figure 30

2. Unscrew and remove the brass outlet water connection from the left black

polypropylene canister connection (Fig.31).

Figure 31

3. Remove the two Phillips screws and washers that secure the brass inlet

water connector to the water heater’s chassis (Fig.32).

Figure 32

4. Separate the brass inlet water connection from the clear ﬂow transducer by

gently pulling it down through the water heater’s chassis (Fig.33). Be aware

that an o-ring that is located at the bottom of the ﬂow transducer will be

creating some friction with the brass inlet connection.

Figure 33

5. Remove the slotted screw and washer to disconnect the red wires from the

left tabs of the thermal cutout switch that is mounted on top of the left brass

heating element assembly (Fig. 34).

Figure 34

6. Remove the two screws and washers that secure the thermal cutout switch

to the left brass heating element assembly (Fig.35).

Figure 35

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Technical Service Bulletin

8 | Tronic 5000C/6000C Polypropylene Heating Canister Replacement

7. Disconnect the short gray wire from the single TRIAC circuit board that is

mounted to the top of the left brass heating element assembly (Fig.36).

Figure 36

8. Disconnect the short pink wire and the short blue wire from the dual TRIAC

circuit board that is mounted to the top of the left brass heating element

assembly (Fig.37).

Figure 37

9. Remove the three screws and washers that secure the two TRIAC circuit

boards to the top of the left brass heating element assembly (Fig.38).

Figure 38

10. Remove the TRIAC circuit boards and bracket from the top of the left brass

heating element assembly (Fig.39).

Figure 39

11. The black polypropylene canisters are secured to the chassis by ﬁve M4

ﬂange nuts (example shown in Fig.40). Remove all ﬁve nuts from the

threaded studs.

Figure 40

Data subject to change without notice | Printed in the USA | BTC 722002312 A | 08.2021 Bosch Thermotechnology Corp.

Technical Service Bulletin Tronic 5000C/6000C Polypropylene Heating Canister Replacement | 9

12. Separate the two black canisters from each other by rotating at the joint to

disengage the connection, and then pulling them apart (Fig.41).

Figure 41

13. Ensure that the o-ring is in place on the existing right canister’s connector

pipe (Fig.42) and lubricate it with a small amount of silicone grease.

Figure 42

14. Connect the new left canister to the existing right canister and rotate to lock

into place (Fig.43).

Figure 43

15. Using the ﬁve M4 ﬂange nuts that were removed in Step 11, secure the

black polypropylene canisters back to the chassis’ threaded studs (Fig.44).

Figure 44

16. Heat sink paste was supplied with the new black polypropylene canister,

apply it to the brass element assembly cap at the three locations outlined

below (Fig.45).

Figure 45

Data subject to change without notice | Printed in the USA | BTC 722002312 A | 08.2021 Bosch Thermotechnology Corp.

Technical Service Bulletin

10 | Tronic 5000C/6000C Polypropylene Heating Canister Replacement

17. Place the TRIAC circuit boards back on top of the brass element assembly,

ensuring that the correct wires pass through the correct slots (Fig.46).

Figure 46

18. Secure the TRIAC circuit boards to the brass element assembly (Fig. 47)

using the three screws and washers that were removed in Step 9.

Figure 47

19. Reconnect the short pink wire and the short blue wire back to the dual TRIAC

circuit board (Fig. 48).

Figure 48

20. R

econnect the short gray wire back to the single TRIAC circuit board (Fig.

49).

Figure 49

21. Use the two screws and washers that were removed in Step 6 to secure

the thermal cut out switch back on top of the right brass heating element

assembly, ensuring that ground wire is reconnected correctly (Fig.50).

Figure 50

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