Thank you for having chosen an LAE electronic product. Before installing the instrument, please read this instruction booklet carefully
in order to ensure safe installation and optimum performance.
1. INSTALLATION
1.1
LF28, size 105x90x55 mm (WxHxD), must be fitted to a DIN rail in such a position so as to prevent debris and moisture
infiltration which may cause serious damage and compromise safety.
1.2
The instrument should work with room temperatures between -10°.. +50°C and relative humidity between 15%.. 80% inclusive.
Supply voltage, switched powers and connection set-up should scrupulously comply with the indications given on the container. To
reduce the effects of electromagnetic disturbance, keep the flat connecting cable, the sensor and signal cables well separate from
the power wires.
1.3
The display unit LCD16 is secured to the panel by means of the two springs on the side of the box. The unit is mounted on the
panel through a 29x71 mm opening, exert a moderate pressure so as to get the LCD16 to align flush to the panel surface. The main
unit LF28 and the display unit LCD16 are connected to each other by means of the flat cable supplied in the package.
1.4
The sensor T1 measures the air temperature and activates in the thermostat control cycle; it should be placed inside the
appliance in a point that truly represents the temperature of the stored product. If enabled (T2=YES), the sensor T2 measures the
evaporator temperature and should be placed where there is the maximum formation of frost. If enabled (T3=YES), the sensor T3
should be located between the condenser fins, half way between the condenser inlet and outlet. The auxiliary sensor T4 can be used
to monitor the temperature of either a second evaporator (T4=2EU), or of a second condensing unit (T4=2CU) or disabled
(T4=NON).
CAUTION: should the relays have to switch a heavy load frequently, it is advisable to contact the manufacturer for indications on the
lifetime of the contacts.
Whenever products must be kept within very severe specifications or the products have considerable value, the use of a second
instrument is recommended, which activates upon or warns of any malfunction.
2. OPERATING MODES
Upon switching on, just the central line (autotest) appears on the display for approximately three seconds and the subsequent indications depend
on the operating status of the controller. TABLE 1 gives the indications associated with the various states, whereas the symbols appearing in the
text are explained in TABLE 2.
2.1 S
TANDBY
.
If button
is pressed for 3 seconds, it allows the LF28 to be put on a standby, or to resume output control (with
INSTRUCTIONS FOR INSTALLATION AND USE.
LF28
0LLF28003EN
S
TANDBY
N
ORMAL
I
NFO
M
ENU
I
NFO
D
ATA
S
ETUP
M
ENU
P
ARAMETER
V
ALUE
OFF
-19
T1
-20
SCL
1°C
Not
Product
Air
Display scale
Operating
Temper. (sim.)
temperature
DEF
T2
-25
SPL
-25
Defrost
Evaporator Minimum
temperature
setpoint
REC
- - -
- - -
SPH
-18
Recovery after
...
Maximum
defrost
setpoint
HI
TLO
-19
- - -
- - -
High temp.
Min. stored
....
alarm
temperature
- - -
CND
15
- - -
- - -
....
Condenser clean
....
cycle
E1
LOC
NO
- - -
- - -
Faulty T1 probe
Locked keypad
TABLE 1
