Technibel CHG 11 - Operation of ECH Electronic Control

GB
7
5 - OPERATION OF “ECH” ELECTRONIC CONTROL
•
See the wiring diagrams at the back of the manual.
5.1 - DELIVERY STATE
• The control unit is supplied fitted in the machine and
factory pre-set.
• All the connections are made except those concerning the
available signals or the options.
5.2 - PRINCIPLE
•
The microprocessor controls the operation of the machine
and of the associated alarms.
It continuously compares the water temperature measured
by the probe
SD1 and the setpoint temperature value
entered via the keyboard.
Each operating request produced by the control unit is
indicated by the light (
6) (see below).
This light flashes if a safety delay is in progress. It stays on when the compressor is operating.
• The
control probe SD1 is located on the water inlet in the factory.
• The controller is connected on a printed circuit board on which the inputs and outputs are connected.
On this board:
- 12 V supply transformer,
- the alarm report relay,
- the 230 V circuit fuse (4 A - 250 V - 5x20 - fast - breaking capacity: 1.5 kA).
5.3 - PRESENTATION
5.3.1 - DISPLAY KEYBOARD
(1) Key for:
- Local On / Off control,
- access to parameters (in combination with button (
2)),
- alarm clearance,
- hour counter reset.
(2) Key for:
- access to parameters (in combination with button (1)).
(3) LED display.
(4) Cooling mode indicator.
(5) Heating mode indicator (not used).
(6) Compressor on indicator.
(7) Defrosting indicator (not used).
(8) Anti-freeze on indicator (not used).
(9) Decimal point: if illuminated when the operating time is displayed, the value must be multiplied by 100.
5.3.2 - CTN TYPE TEMPERA
TURE PROBE
•
10 kΩ at 25° C.
DIGIT
AL INPUTS
ECH 210 BDT
CONTROLLER
12 V
AC
SUPPLY
TRANSFORMER
ACTUATORS
SD1 W
ater inlet
temperature probe
(for control)
SD2 W
ater
outlet temperature
probe (for anti-
freeze protection)
SD3 Air heat
exchanger
temperature probe
(for pressure
adjustment)
SD4 Outside
temperature probe
6 4 2
7
8
3 9 1
5
Temperature (°C) Ohmic value (Ohm)
-20 67 740
-10 42 450
0 27 280
10 17 960
20 12 090
25 10 000
30 8 313
40 5 820
50 4 161
60 3 021
70 2 229
AI1
AI2
AI3
AI4