T-292
2-9
Table 2.3 -- Continued
Orange wire
Power
Red wire
Output
Brown wire
Ground
Input voltage
5 vdc
i Humidity Sensor
Output voltage
0 to 3.3 vdc
i. Humidity Sensor
Output voltage readings verses relative humidity (RH) percentage:
30%
0.99 V
50%
1.65 V
70%
2.31 V
90%
2.97 V
2.4 SAFETY AND PROTECTIVE DEVICES
Unit components are protected from damage by safety
and protective devices listed in the following table.
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 of the
following safety devices open: (a) Circuit Breaker(s); (b)
Fuse (F3/15A); or (c) Evaporator Fan Motor Internal
Protector(s) -- (IP-EM).
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 (F3)
10 amp rating
Excessive current draw by the
controller
Fuse (F1 & F2)
5 amp rating
Excessive current draw by the
expansion module
Fuse (F4)
10 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 mo-
tor 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 mo-
tor(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
93
_
C = (200
_
F)
35 kg/cm
@
= (500 psig)
Abnormally high discharge
pressure
High Pressure Switch (HPS)
Opens at 25 kg/cm
@
(350 psig)
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