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Before a pre – defined condition, the main winding current, which is also the current passing through the relay coil is
reduced to a value under the required value in order to maintain the relay armature lifted. The armature turns down,
opens the start winding contacts and removes the start winding of the circuit.
Seried with the motor windings is a bimetallic protector against overloads in the relay box. The overload protector jumper
is connected with the common terminal (C) in the compressor. See Figure B2
Figure B2 - Start relay and overload protector
If the current through the motor windings increase to a dangerous level, the heat caused by the current pass through the
bimetallic disk will make it bend and open the contacts. This interrupts the circuit to the motor windings and stops it
before damage occurs.
The overload protector incorporated in the relay box and mounted against the motor frame offers additional protection to
the compressor’s motor, because it protects against currentsurplus and temperature excessive increase.
After an overload or a temperature increase have caused the overload to interrupt the circuit, the bimetallic disk cools
and returns contacts to the closed position. The time required for the overload switch reset varies according to the room
temperature as well as the compressor’s temperature.
The overload protector has been particularly designed with the appropriate electric characteristics for the compressor’s
motor and its application. If replaced, an identical model should be used with the same part number. AN OVERLOAD
PROTECTOR SHOULD NEVER BE REPLACED WITH ANOTHER NON-AUTHORIZED PART NUMBER. An
inadequate protector may cause a motor burnt. If the relay doesn’t work, change the relay and the overload protector, as
well.
When the thermostat stops operation after a normal cycle or when the plug cable is disconnected during an operation
cycle, 8 minutes should pass until the “discharge” (or more minutes if the interruption occurred during a temperature
decrease), which is the reduction of pressure difference between the system high side and low side. During this
discharge period the overload will activate if the feed cable is plugged.
In order to verify if the overload protector is open, connect its terminals in short circuit. See figure B2. If the compressor
starts, replace the protector. Otherwise, check other possible problems (for example: low line voltage during the start
interval, so that both relay and compressor will not work).
As the relay works with current and has been mapped out for a particular value of the motor and the compressor, it is
essential to use the relay right size represented by its part number. A START RELAY SHOULD NEVER BE REPLACED
WITH A NON-AUTHORIZED PART NUMBER.
The relay cannot be properly adjusted nor repaired in the field; if it is necessary it should be replaced with a new relay.
If the compressor starts and works repeatedly for a few seconds and then cycles with the overload protector, the start
relay contacts can be sticked in closed position, and the excessive current makes the protector function.
PAGE. B2
13
1
Run winding
3
Overload
protector
2
10
12
Start winding
Common
11
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