Parker ATT Serie Manual De Uso página 29

High pressure by
Pressure Switch
No
Yes
Cooling air high
Decrease cooling air
temperature
temperature
No
Yes
Decrease com-
Excessive thermal load
pressed air quantity
temperature
No
Yes
Condenser dirty or Clean
obstructed
condenser
No
Yes
Replace
Fan pressure switch (PV)
not set
pressure switch
No
Yes
ETV liquid closed
Substitute ETV
No
Yes
No refrigerant, recharge
Low current absorption
Z
No
Fan pressure switch (PV)
not set
No
Excessive thermal load
High AD inlet Tem-
perature
English
FAULT
High Temperature byt
Pressure Switch
Yes
Lower
current consumption
No
Z
Z
Calibrate valve
Yes
Replace pressure
Z
switch
Increase cooling air
REMEDY
CAUSE
By-pass Alarm fail/open
No refrigerant recharge
Z
Yes
Hot gas valve not cali-
Z
brated
No
Yes
Fan pressure switch (PV)
not set
No
Yes
Low cooling air tempe-
rature
temperature
No
Low AD inlet Tem-
peratur
ATT140-340
Low Pressure by Pressure
Switch
Yes
Pressure switch defect
substitute
No
Yes
ETV liquid closed
substitute
No
Request external
assistance
Clean heat exchanger
Fit/renew prefi lter
Yes
Heat exchanger fouled
with debris
Yes
No
High pressure drop
Low Evaporation
temp.
Z
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