Operation Section
41
5.14 Fan Motor Relay
• The fan motor relay is a normal open contact
relay.
• When the unit is operating, the current is
flowing through terminal A1 and A2 of the
relay’s coil and causes contactor terminals 13
and 14, 23 and 24, 33 and 34, 43 and 44 to
become closed, and the power is supplied to
the evaporator fan motor.
Specifications:
5.15 Overcurrent Relay
• For the three-phase fan motor, an overcurrent
relay is usually used as a safety device. This
prevents the motor coil from burning if an
overcurrent situation has occured due to
abnormal load on the fan motor, extraordinary
change in supply voltage, or loss of current in
one phase. If overcurrent flows into the heating
coil wound around the bimetalic strip, the
bimetalic strip curls, thereby opening the output
contact (across terminals 95 and 96). This
output contact shuts off the auxiliary relay
circuit and brings the unit to a stop.
• Set the current dial according to the table
shown below.
Contact Rating 240 V max., 15 A
Coil Rating 240 V max., 0.025 A
Contact Rating Tripping Current
For evaporator fan motor 220 V, 3 A 2.8 A
For condenser fan motor 220 V, 3 A 2.0 A
I003096
13 23 33 43
44
342414
A1
A2
14
443424 A2
14
443424 A2
13
433323 A1
I003034
1/L1 3/L2 5/L3 97 95
96
A2
986/T34/T22/T1
1/L1
2/T1 4/T2 6/T3
3/L2 5/L3
95
97
98
96
Current Setting Dial
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