Specifications

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Special Controllers
Lead-Lag Controller
Lead-Lag Controller for 2 complete units, with
On/Off cycling every 24 hrs.
The Lead-Lag controller is the most efficient way of
controlling temperature in a remote location where
both a primary cooling unit and a back-up cooling unit
are used.
The Lead-Lag controller controls 2 different units,
treating them as 2 different stages, and allows them
to cycle On and Off every 24hrs. This ensures that the
desired room temperature is always maintained and
also prevents wear of the units.
With a 4°C differential kept always between room
temperature and set temperature, the Lead-Lag
controller is ideal for environments, such as computer
rooms and other rarely visited rooms.
Features
AC
COOL
EXT.
SENSOR
OPTION
TIMER
COMPRESSOR
DELAY
y Main Supply - 230VAC
y Auto switch-over from one unit to the other every
24 hrs.
y In Auto mode, the 2 units (on-duty and off-duty) are
treated like 2 stages
y On-duty unit compressor cycles between “On” and
“Off” depending on room temp. and set temp.
y Time delay for compressor protection
y 4°C always maintained between room temp and set
temp- off-duty unit will start operating, if necessary.
y Manual switch-over (3 positions) between “Auto”,
“Off” and “Manual”
y Display of ambient temperature on a wall-
mount room thermostat (ETN).
y Fault indication when ambient temperature rises
above 28°C.
y External sensor for ambient room temperature.
Wiring diagram