The Electronic System; Exchange Of The Electronic Part - Wittmann Tempro basic C 90 Translation Of Original Operating Manual

9.9 The electronic system

The board which is installed there (type „ST04")contains the micro-processor with
integrated data and program memory.
The board is the „control centre" of the electric system and therefore is responsible
for the display, operation, temperature measuring and processing, control, filling
level and the triggering of pump contactor, heating contactor, valves and alarm
relay.
Level monitoring, pump and over-temperature recognition and internal sensor are
read in.
The pump motor is protected against overheating by built-in winding protection
contacts.
Monitoring of medium subject to temperature regulation (and consequently the
whole equipment) is performed through a safety temperature limiter which, in case
of heating error, switches off the heating security system separating it from the
mains.
This limiter works on the principle of liquid expansion (completely de-energized)
and therefore grants effective protection against major damage even if the
electronic system fails.
The safety temperature limiter is installed in the electric cabinet.
The sensor distance line (a very thin, spiraled, and insulated copper tube) leads
from the switching part of the limiter to the sensor tube which is stuck in the
protective tube welded onto the heating.

9.9.1 Exchange of the electronic part

The control board is fitted to the mounting bracket by means of three spacers.
§
Fold open electric cover
§
Remove all connection wires, disconnect connector from control board
§
Pull board from mounting bracket
§
Replace board and attach fault description !!!
Installation in reverse order
The display board is attached to the electric hood from the inside with three
screws.
§
Fold open electric cover
§
Disconnect connector from display board
§
Unscrew board from the electric hood and remove from the hood.
§
Replace board and attach fault description !!!
Installation in reverse order
Tempro basic C 90 & Tempro primus C 90
BASIC & PRIMUS C90 V 3.0 english / 10.04.2012
Page 45