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T-318
2
−
9
2.3 ELECTRICAL DATA (Continued)
f. Evaporator Coil
Heater
Number of Heaters
6
Rating
750 watts +5/-10% each @ 230VAC
Resistance (cold)
66.8 to 77.2ohms @ 20
°
C (68
°
F)
Type
Sheath
g. Fuses
Control Circuit
7.5amps (F3A, F3B)
Controller/DataCORDER
5amps (F1 & F2)
Emergency Defrost
5amps (FED)
Drain Line Heater
5 amps (FDH)
Humidity Power
Transformer
5amps (FH)
h. Compressor Crankcase Heater
180watts @ 460VAC
i. Humidity Sensor
Orange wire
Power
Red wire
Output
Brown wire
Ground
Input voltage
5vdc
Output voltage
0 to 3.3vdc
Output voltage readings verses relative humidity (RH) percentage:
30%
0.99V
50%
1.65V
70%
2.31V
90%
2.97V
j. Controller
Setpoint Range
-30 to +30
°
C ( -22 to +86
°
F)
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.
Table 2-1 Safety and Protective Devices
UNSAFE CONDITION
SAFETY DEVICE
DEVICE SETTING
Circuit Breaker (CB-1)
−
Manual Reset
Trips at 29amps (460VAC)
Excessive current draw
Circuit Breaker (CB-2, 50amp)
−
Manual Reset Trips at 62.5amps (230VAC)
Circuit Breaker (CB-2, 70amp)
−
Manual Reset Trips at 87.5amps (230VAC)
Excessive current draw in con-
trol circuit
Fuse (F3A & F3B)
7.5amp rating
Excessive current draw by con-
troller
Fuse (F1 & F2)
5amp rating
Excessive current draw by
emergency defrost circuit
Fuse (FED)
5amp 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 mo-
tor(s) winding temperature
Internal Protector(s) (IP-EM)
−
Automatic
Reset
N/A
Abnormal pressures / temperat-
ures in the high refrigerant side
Fusible Plug
−
Receiver
Rupture Disc
−
Water-Cooled Condenser
99
°
C = (210
°
F)
35kg/cm
= (500psig)
Abnormally high discharge
pressure
High Pressure Switch (HPS)
−
Automatic
Reset
Open at 25kg/cm@ (350psig)
Close at 18kg/cm@ (250psig)
Содержание 69NT40-541-300
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Страница 128: ......
Страница 131: ...7 3 T 318 Based on Drawing 62 66058 Figure 7 2 SCHEMATIC DIAGRAM Units with 3 Phase Evaporator Motors...
Страница 133: ...7 5 T 318 6 Heater FCCH FCCH Figure 7 4 SCHEMATIC DIAGRAM Units with Normal Evaporator Fan Capability...
Страница 134: ...7 6 T 318 FCCH FCCH Figure 7 5 SCHEMATIC DIAGRAM Units with Single Evaporator Fan Capability...
Страница 136: ...7 8 T 318 To ST10 To TRX2 To QC1 To QC1 To QC1 To MC6 CONTROLLER Figure 7 7 SCHEMATIC DIAGRAM Emergency Bypass...
Страница 138: ...7 10 T 318 Based on Drawing 62 66058 Figure 7 9 UNIT WIRING DIAGRAM Units with 3 Phase Evaporator Motors Sheet 1 of 2...
Страница 139: ...7 11 T 318 Based on Drawing 62 66058 Figure 7 10 UNIT WIRING DIAGRAM Units with 3 Phase Evaporator Motors Sheet 2 of 2...
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