M&C TechGroup EC-30_FD Operator's manual - Manual (Page 19)

19
Gas sampling and gas conditioning technology 3-4.20-ME
Switching on the low-temperature stages
After approx. 30 minutes the pre-cooler stage has been cooled down to a
temperature below +4

C. The top red LED goes out and the bottom red LED
lights up. The low-temperature stage  is activated and starts operating at
full power. The cooler compressor is switched of as soon as the pre-cooler
stage reaches the controlled temperature of +1

C. The middle LED lights up
green. The cooler compressor will be alternately switched on and off by the
EC automatic control electronics in a load-dependent cycle. The middle LED
will alternately light up pink and green (normal operating functions).
N O T E !
A second meaning of the flashed up bottom red LED and the flashed up
green LED in the middle could be that the temperature of the pre-cooling
stage is to low (see also chapter 17).
Normal operation
After about 1 hour the low-temperature stage  reaches the alarm threshold
value of -25

C. The bottom LED goes out. The status collector alarm
contacts are deactivated and control the automatic external release for gas
measurement. The EC30 cooler unit is ready for operation. The low
temperature stage will be operated without control and will reach approx. -
30

C. Normal operating function will be indicated on the front panel by the
middle two-coloured LED.
°C >
ON
°C <
pink
green
red
°C >
ON
°C <
pink
green