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5
−
4
T-318
CONDITION
POSSIBLE CAUSE
REMEDY/
REFERENCE
SECTION
5.11 EAUTOFRESH NOT OPERATING
Vent not opening
Unit not Configured for eAutoFresh Operation
No action
Cd43 in Off mode
Wiring disconnected
Check wiring
Stepper drive defective
Stepper motor defective
Unit operating in frozen mode
Gas Limit mode unavailable
Check CO
2
sensor
Wiring disconnected
Check wiring
Unit operating in frozen mode
Unable to calibrate CO
2
sensor
“Enter“ Key not held for sufficient length of time
CO
2
outside of acceptable levels
Check
Check CO
2
sensor
Cd44 displays “
−−−−−
”
Unit not Configured for eAutoFresh Operation
No action
Check CO
2
sensor
5.12 THERMOSTATIC EXPANSION VALVE MALFUNCTION
Low suction pressure with high
superheat
Low refrigerant charge
External equalizer line plugged
Open
Wax, oil or dirt plugging valve or orifice ice formation at
valve seat
Superheat too high
Power assembly failure
Loss of element/bulb charge
Broken capillary
Foreign material in valve
High suction pressure with low
superheat
Superheat setting too low
External equalizer line plugged ice holding valve open
Open
Foreign material in valve
Liquid slugging in compressor
Pin and seat of expansion valve eroded or held open by
foreign material
Fluctuating suction pressure
Improper bulb location or installation
Low superheat setting
5.13 AUTOTRANSFORMER MALFUNCTION
Unit will not start
Circuit breaker (CB-1 or CB-2) tripped
Check
Autotransformer defective
Power source not turned ON
Check
460 VAC power plug is not inserted into the receptacle
5.14 WATER
−
COOLED CONDENSER OR WATER PRESSURE SWITCH
High discharge pressure
Dirty coil
Noncondensibles
Condenser fan starts and stops
Water pressure switch malfunction
Check
Water supply interruption
Check
Содержание 69NT40-541-300
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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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