Bosch TRONIC 5000C Pro Referenzhandbuch

Technical Service Bulletin:

Triac Printed Circuit Board Replacement

TRONIC 5000C Pro Models: WH17, WH27, WH36

Introduction

WARNING

ELECTRICITY IS EXTREMELY DANGEROUS.

TAKE EXTRA PRECAUTIONS AND ENSURE ALL

CIRCUIT BREAKERS ARE OFF BEFORE

PERFORMING ANY WORK ON THE HEATER

WARNING

THE FOLLOWING PROCEDURE MUST BE

PERFORMED BY A LICENSED ELECTRICIAN

Tools Required

Electrical meter

Phillips head screwdriver

Small flat head screwdriver

Heat sink paste

Replacement of the triac printed circuit board will be

easier if you can work slightly above the unit.

Preparation

1. Remove the four cover screws and retain, lift off the cover and

store safely.

2. Using an electrical meter, conﬁrm power is off the the heater.

Removing the triac wiring

1. Remove the thin white signal wires from the printed circuit

boards by gently bending the locking tab on the connector with

a small ﬂat head screwdriver so that the plug can be removed

(Fig. 1). These cables can be moved out of the working area.

Fig. 1

2. Using the small ﬂat head screwdriver pull the ¼" push on

connectors off the triac printed circuit boards (Fig. 2). The

recommended method is to use a small ﬂat head screwdriver in

the rectangular hole and then push the screwdriver blade so that

the connector pulls off straight.

Fig. 2

Data subject to change without notice | Printed in the USA | BTC 722002307 A | 01.2014 Bosch Thermotechnology Corp.

2 | Triac Printed Circuit Board Replacement

3. The wiring back to the main terminal block and element can be

placed out of the working area.

On the 36kW the triac printed circuit board on the right

hand assembly uses ring terminals retained by large

screws. These can be removed with a Phillips head

screwdriver, retain the screws and washers for

reassembly.

Removing the printed circuit boards

1. Using a Phillips head screwdriver undo the one or two triac

clamping screws (Fig. 3 & 4). Using a magnetic bit will make this

easier as the screws and washers will lift out easily (Fig. 5).

Retain these screws and washers for reﬁtting.

The white paste on these parts is normal and is used

to transfer heat from the triac to the brass head. Avoid

getting it onto clothing and wipe / wash from hands

before eating or drinking.

Fig. 3

Fig. 4

27kW & 36kW

Only

Fig. 5

2. Using the small ﬂat head screwdriver, gently open the latch on

the moulding holding the printed circuit board in place (Fig. 6).

Fig. 6

Latch

Dual triac printed circuit board

all models

3. Rotate the printed circuit board slightly to clear the latch and

remove from the slot at the other end (Fig. 7). Discard the

printed circuit board in accordance with the local environmental

laws.

Fig. 7

Single triac printed circuit

board 27kW & 36kW only

Latch

Data subject to change without notice | Printed in the USA | BTC 722002307 A | 01.2014 Bosch Thermotechnology Corp.

Triac Printed Circuit Board Replacement | 3

Reﬁtting the circuit boards

1. Lay the new printed circuit board on a work surface. Using the

syringe or small packet supplied squeeze a small amount of

white heat transfer paste onto the metal underside of each of

the triac switches (Fig. 8). This should be approximately the size

of the head of the triac ﬁtting screw (¼” diameter).

WARNING

AN INADEQUATE AMOUNT OF HEAT SINK PASTE

CAN LEAD TO TRIAC FAILURE AND OVERHEATING,

CAUSING THE THERMAL CUT-OUT TO TRIP.

Fig. 8

2. Reassemble the printed circuit boards to the moulding by

slotting in one end and then rotating clockwise to click into the

latch on the moulding (Fig. 9 & 10).

Fig. 9

Dual triac printed circuit board

Slot in here

Snap in here

Fig. 10

Single triac printed circuit board

Slot in here

Snap in here

3. Using the Phillips head screwdriver (ideally with a magnetic bit)

insert the screw with lock washer through each of the triac

switches and lightly engage the thread (Fig. 3 & 4). Insert all

screws (1 or 2) before tightening hand tight without damaging

the screw head.

WARNING

INADEQUATE CONTACT BETWEEN THE TRIAC

BASE AND THE BRASS HEATING ELEMENT

ASSEMBLY CAN LEAD TO TRIAC FAILURE.

ENSURE ALL SCREWS ARE TIGHT AND CONTACT

IS SUFFICIENT (SEE FIG. 11).

Fig. 11

Data subject to change without notice | Printed in the USA | BTC 722002307 A | 01.2014 Bosch Thermotechnology Corp.

4 | Triac Printed Circuit Board Replacement

Reconnecting the wiring

1. Refer to the wiring diagram for each model. Reﬁtting of the ¼”

connectors (Fig. 2) should be done by pushing them straight

onto the tabs on the printed circuit board. Use a ﬂat blade

screwdriver to push the connectors on if required after aligning

for straight engagement.

2. Assemble the wiring to the printed circuit board nearest the

metalwork ﬁrst for ease of access (Fig. 12 - 16).

Fig. 12

17kW & 27kW

Brown terminal block wire

Left hand assembly– Short Blue element wire

Right hand assembly– Short Black element wire

Left hand assembly – Blue terminal block wire

Right hand assembly– Black terminal block wire

Short Brown

element wire

Fig. 13

27kW only

Short Grey element wire

Grey terminal

block wire

Fig. 13

27kW only

Short Grey element wire

Grey terminal

block wire

Fig. 14

Grey terminal

block wire

Short Grey

element wire

36kW Only Left hand assembly – Short Blue element wire

Center assembly – Short White element wire

Right hand assembly – Short Black element wire

Left hand assembly – Blue terminal block wire

Center assembly – White terminal block wire

Right hand assembly – Black terminal block wire

Fig. 15

36kW center & left assemblies

Brown terminal block wire

Short Brown element wire

Fig. 16

Brown terminal block wire

36kW right assembly

Short Brown element wire

Data subject to change without notice | Printed in the USA | BTC 722002307 A | 01.2014 Bosch Thermotechnology Corp.

5 | Triac Printed Circuit Board Replacement

Bosch Thermotechnology Corp.

50 Wentworth Avenue

Londonderry, NH 03053

Tel: 1-800-283-3787

Fax: 1-603-965-7581

www.bosch-climate.us

3. Reconnect the thin white signal wires; the three wire connector

goes to the printed circuit board mounted nearest the back. The

two wire cable goes to the printed circuit board on the left hand

side of the head on the 27kW & 36kW units.

Ensure the connector is aligned with all of the the pins

and not offset or the heater will not work properly.

Reﬁtting the cover

1. Before reﬁtting the cover perform a once over check:

Are all connections made correct to the wiring diagram for

this model?

Are all connections tight?

Is there evidence of the heat transfer paste being squeezed

out from under each of the triac switches where they have

been clamped?

2. Reﬁt the cover using the 4 screws ensuring that no wires are

trapped and that the red clip in lens is not knocked out.

3. Fill the unit with water and follow the commissioning routine in

the user handbook. Ensure you have a continuous ﬂow of water

from all the hot water faucets before resetting the breakers.

WARNING

DO NOT TURN ON THE ELECTRICITY UNTIL THE

UNIT IS FULL OF WATER AS THIS WILL DAMAGE

THE UNIT.

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