Lennox INNOV DM R Series Application Manual page 83

Electric control board
The electric control board is constructed and wired in accordance with Directives 73/23/EEC and 89/336/EEC
and related standards. The board may be accessed through a door after the main switch has been put-off. All the
remote controls use 24 V signals powered by an insulating transformer situated on the electric control board.
Note: The mechanical safety devices such as the high pressure switch are of the kind that trigger directly; their
efficiency will not be affected by any faults occurring in the microprocessor control circuit, in compliance
with 97/23 PED.
Microprocessor control
The microprocessor built into the unit allows the different operating parameters to be controlled from a set of
push-buttons situated on the electric control board:
D Switching On / Off of compressor to maintain the temperature set point T inside the shelter.
D Alarm management:
D Alarm signalling.
D Display of operating parameters.
D RS232 or RS485 serial output management (optional).
D Phase sequence error (not displayed only by the mP, but prevents the compressor from starting up).
See microprocessor control manual for further details, also in relation to particular customer specifications.
Fig. 4 Basic cooling circuit (DX version)
7
6
5
13
10
4
13
10
14
12
OPTIONAL
INNOV@ CENT -AGU-0912-E
- High / Low pressure;
- Dirty filters alarm;
- Air flow alarm.
8
M
SUPPLY LIMIT
M
11
1 Compressor
2 HP pressure switch
3 Pressure transmitter
4 Ball valve
5 Refrigerant filter
6 Sight glass
7 Thermostatic valve
P 9
8 Evaporating coil
9 LP pressure switch
10 Liquid receiver
1
11 Remote condenser
12 Flooding valve
13 Safety valve
14 Check valve
2
P
3
4
. 7 .