GREE Air-ccoled Closed Control Unit Service Manual
115
Thermostat
When thermostat connects
to circuit, if controller gives
alarm, electric heat doesn’t work
and fusible cutout doesn’t have
malfunction, the thermostat may
have malfunction. Check if it is
still conductive by universal
meter. If it is conductive, it is
good while if not, it is damaged.
Thermal relay
Thermal relay will detect the
current to the wire of a load.
When the current is bigger than
the activation value of thermal
realy, its normally open contact
will close and its normally closed
contact will be off. The normal
closed contact usually connects
to the port of alarm of controller
so at that time, the controller will
give alarm. Installation of thermal
relay includes independent type
and integrated type. The
independently installed thermal
relay is separate from AC
contactor and installed below the
AC contactor.
Phase reversal
protector
After three-phase power
supply is connected, measure
output contact of phase reversal
protector is closed. If it is closed,
the phase sequence is correct
while if not, the sequence is
wrong, which shall be solved by
switching any two wire of the
three-phase power.
Flooding switch
It is used to detect if there is
water on floor.
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