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2--10
T-334
Table 2--1 Safety and Protective Devices
UNSAFE CONDITION
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 in the
control circuit
Fuse (F3A & F3B)
7.5 amp rating
Excessive current draw by the
controller
Fuse (F1 & F2)
5 amp rating
Excessive current draw by the
emergency bypass module
Fuse (FEB)
10 amp rating
Excessive current draw by the
emergency defrost module
Fuse (FED)
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/tempera-
tures in the high refrigerant
side
Fusible Plug - Used on the Receiver
Rupture Disc - Used on the Water-Cooled Con-
denser
99C = (210F)
35 kg/cm
2
= (500 psig)
Abnormally high discharge
pressure
High Pressure Switch (HPS)
Opens at 25 kg/cm
2
(350 psig)
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