Troubleshooting - Sullair ES-8 Operator's Manual And Parts List

Section 10
DRYER MAINTENANCE
AND TROUBLESHOOTING
10.4 TROUBLESHOOTING -- DRYER (continued)
SYMPTOM
HEAD PRESSURE TOO LOW
SUCTION PRESSURE TOO LOW
SUCTION PRESSURE TOO HIGH
WATER IN THE COMPRESSED
AIR SYSTEM
40
PROBABLE CAUSE
Low Ambient Temperature
Refrigerant Shortage
Defective Fan Control Switch
Hot Gas Bypass Valve Out of
Adjustment or Defective
Refrigerant Shortage
Excessive Pressure Drop in High Side
Head Pressure Too Low Due to
Defective Fan Control Switch
Hot Gas Bypass Valve Out of
Adjustment or Defective
Refrigerant Overcharge
Drain Traps Clogged
Improperly Set or Malfunctioning
Hot Gas Bypass Valve, or Cycling
Switch
Ambient Temperature is Too High
REMEDY
Increase ambient temperature.
If ambient temperature is too low, dryer freeze--- up
can take place.
Add some type of head pressure control.
Check for leaks in system; repair and recharge with
proper amount--- see Section 3, Specifications.
Replace. Fan should cut out at 170 psig (11.7 bar).
Adjust or replace.
Turn clockwise to increase suction pressure; See
Section 8.5 for normal operating conditions.
Add enough refrigerant to maintain desIred suction
pressure.
Also check amperage draw.
Check for any restriction (plugged filter dryer).
Suction pressure should be steady and vary only 1
to 3 psig (0.07 to 0.2 bar) from high to low at this
condition.
Replace.
Turn counterclockwise to lower suction pressure to
desired reading.
Compressed air dewpoint will rise as the suction
pressure increases.
Excess refrigerant; check unit's nameplate for total
system refrigerant charge.
Refrigerant overcharge may cause system not to
perform properly and efficiently.
Disassemble and clean traps to restore free flow of
drainage.
Check drain lines.
Automatic drain traps are ballfloat type and do not
need priming. They should be disassembled and
cleaned after two weeks of operation.
Will be indicated by suction pressure being too
high. Adjust or replace.
Reduce ambient or improve ventilation.