2920 1351 01
18
Instruction book
6 PROBLEM SOLVING
Mechanical faults and their suggested remedies
Explanation about the table below:
- Conditions of the dryer, always preceded by a number, are
printed in bold.
- Each possible fault is followed by its related suggested
remedy and both are preceded by the same letter.
1. Pressure dewpoint temperature too high
a. Air inlet temperature too high
a. Check and correct; if necessary, install a pre-cooler
b. Ambient temperature too high
b. Check and correct; if necessary, draw the cooling air
via a duct from a cooler place or relocate the dryer
c. Insufficient cooling water flow
c. Check and increase water flow, check cooling water
regulating valve
d. Cooling water inlet temperature too high
d. Decrease cooling water inlet temperature, as necessary
e. Air inlet pressure too low
e. Increase the inlet pressure
f. Dryer capacity is exceeded
f. Reduce the air inlet volume flow
g. Shortage of refrigerant
g. Consult Atlas Copco
h. Refrigerant compressor does not run
h. See 3
i. Evaporator pressure is too high
i. See 7
j. Condenser pressure is too high
j. See 2
k. Automatic drain of condensate trap inoperative
k. Flush the assembly by opening the manual drain valve.
Have system inspected
2. Condenser pressure too high or too low
a. Fan control switch out of order
a. Test and replace the switch if necessary
b. Fan or fan motor out of order
b. Check and correct as necessary
c. Ambient temperature too high
c. See 1b
d. Condenser externally clogged
d. Clean the condenser
e. Insufficient cooling water flow
e. See 1c
f. Cooling water inlet temperature too high
f. See 1d
3. Compressor stops or does not start
a. Electric power supply to compressor is interrupted
a. Check and correct as necessary
b. The internal thermic protection of the motor has tripped
b. The compressor will restart when the motor windings
have cooled down. Check also for undervoltage
c. The high pressure shut-down switch has tripped
c. The compressor will restart when the pressure has
decreased
d. The thermal overload protection of the fan motor has
tripped, causing high pressure
d. The fan motor will restart when the windings have cooled
down
4. Pressure drop over dryer too high
a. Air inlet strainer clogged
a. Depressurize dryer and clean inlet strainer
5. Condensate trap remains inoperative
a. Automatic drain system clogged
a. Flush the assembly by opening the manual drain valve
6. Condensate trap continuously discharges air and water
a. Automatic drain system out of order
a. Have system inspected
7. Evaporator pressure is too high or too low
a. Expansion valve incorrectly set
a. Have expansion valve setting adjusted
b. Expansion valve out of order
b. Have expansion valve replaced
c. Condenser pressure too high or too low
c. See 2
d. Shortage of refrigerant
d. Consult Atlas Copco
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