Carrier VECTOR 1800 MT - Page 302

9-9
62-11039
INDICATION/
TROUBLE
POSSIBLE CAUSES
REFERENCE
SECTION
9.4.10 No Evaporator Air Flow Or Restricted Air Flow
Frost on coil 8.24
Evaporator coil blocked
Dirty coil 8.26
Evaporator fan loose or defective 8.7.3
No or partial evaporator
Evaporator fan rotating backwards 8.7.3
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air flow
Evaporator air flow blocked in trailer (box) Check
9.4.11Expansion Valve Malfunction
Low refrigerant charge 8.11/8.12.4
External equalizer line plugged Clean
L
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h
Ice formation at valve seat 8.12
L
ow suction pressure with
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Wax, oil or dirt plugging valve or orifice 8.17
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super
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Broken capillary 8.17
Power assembly failure or partial Loss of
element/bulb charge
Replace
Superheat setting too high 8.17
Superheat setting too low 8.17
External equalizer line plugged Open
Low superheat and liquid
Ice holding valve open 8.12
L
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slugging in compressor
Foreign material in valve Clean
Pin and seat of expansion valve eroded or
held open by foreign material
8.17
Improper bulb location or installation 8.17
Fluctuating suction pressure
Low superheat setting 8.17
High superheat Broken capillary 8.17
9.4.12Solenoid Valve Malfunction
No power to valve Check
Improper wiring or loose connections Check
Coil defective 8.15
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Valve improperly assembled 8.15
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p
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erl
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Coil or coil sleeve improperly assembled 8.15
p
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l
y
Movement of plunger restricted due to:
a. Corroded or worn parts
b. Foreign material lodged in valve
c. Bent or dented enclosing tub
8.15
Solenoid valve closes but
Foreign material lodged under seat Clean
S
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refrigerant continues to flow
Defective seat Replace