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SECTION 2
2-19 T-268-07
2.12 SAFETY AND PROTECTIVE DEVICES
Unit components are protected from damage by safety
and protective devices listed in Table 2-1.These
devices monitor the unit operating conditions and open
a set of electrical contacts when an unsafe condition
occurs.
Open safety switch contacts on either or both of devices
IP-CP or HPS will shut down the compressor.
Open safety switch contacts on device IP-CM will shut
down the condenser fan motor.
The entire refrigeration unit will shut down if one ofthe
following safety devices open: (a) Circuit Breaker(s);
(b)Fuse(F 3/15A); or(c) EvaporatorFan MotorInternal
Protector(s) -- (IP-EM).
Table 2- 1. Safety and Protective Devices
UNSAFE CONDITION SAFETY DEVICE DEVICE SETTING
Circuit Breaker (CB-1) -- Manual Reset Trips at 29 amps (460 vac)
Excessive current draw
Circuit Breaker (CB-2, 50 amp) --Manual
Reset
Trips at 62.5 amps (230 vac)
Circuit Breaker (CB-2, 70 amp) --Manual
Reset
Trips at 87.5 amps (230 vac)
Excessive current draw on the
control circuit
Fuse (F3) 15 amp rating
Excessive current draw by the
Controller/DataCORDER
Fuse (F1 & F2) 5 amp rating
Excessive condenser fan
motor winding temperature
Internal Protector (IP-CM) -- Automatic
Reset
N/A
Excessive compressor motor
winding temperature
Internal Protector (IP-CP) -- Automatic
Reset
N/A
Excessive evaporator fan
motor(s) winding temperature
Internal Protector(s) (IP-EM) -- Automatic
Reset
N/A
Abnormal
pressures/temperatures in the
high refrigerant side
FusiblePlug--UsedontheReceiver
Rupture Disc -- Used on the Water-Cooled
Condenser
93 _C = (200 _F)
35 kg/cm@ = (500 psig)
Abnormally high discharge
pressure
High Pressure Switch (HPS) Opens at 25 kg/cm@ (350 psig)