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 re
fi
tting.
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
fl
at 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
