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2-8T-309
PARAGRAPH 2.3 -- Continued
Orange wire Power
Red wire Output
Brown wire Ground
Input voltage 5vdc
g
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i
d
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Output voltage 0to3.3vdc
g.
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ty
S
ensor
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 PROTECT IVE DEVICES
Unit components are protected from damage by safety
and protective devices listed in the following table.
Thesedevices monitort he unit operating conditionsand
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) EvaporatorFan 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 Brea ker ( CB-2, 50 amp) --Manual Reset Trips at 62.5 amps (230 vac)
Circuit Breake r (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 condenser fan mo-
tor winding temperature
Internal Protector (IP-CM) -- Automatic Reset N/A
Excessive compressor m otor
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)