Sahara Sahara-Pak HC-1260, Instruction Manual

Page: 36 / 136

INSTRUCTION MANUAL
Model HC
Reference 219 Rev 2
Page 36 of 46 06/20/2013
SECTION 3:
TROUBLESHOOTING & CUSTOMER SERVICE
3.0 Troubleshooting
Following proper preventive maintenance procedures will go far toward assuring
trouble-free dryer performance; however, failures will still occur. This section will
help to identify the source of the problem and to effect a remedy.
Problem Probable Cause Remedy
Elevated Dew Point Inlet gas pressure below design
condition Increase pressure
Flow rate higher than design
condition Reduce flow rate
Drying temperature above design
condition Check aftercooler
Desiccant contamination Replace desiccant
Towers not reversing Check PLC, solenoid valve, inlet
switching valve, and dew point
demand system.
Cooler discharge temperature too
high Check cooling water flow rate and
temperature. Fouled or dirty
cooler may require cleaning on air
and/or water side
Dew point indication in error Check calibration/operation of
dew point measuring equipment
(refer to the dew point demand
system operational instructions in
Section 6 for further instructions
on dew point equipment).
Two-way Valve Leakage.
Leakage allowing relatively wet
inlet air into the dry outlet air
stream, thereby raising the dew
point of the composite air. Compare dew point of air at dryer
outlet to dew point measured at
top (outlet) of drying tower (i.e. at
relief valve location). If significant
difference in dew point, one or
both closed 2-way valves is
leaking. Check actuator operation
and check for seat wear.
Excessive Pressure Drop in
Dryer Inlet pressure below design
condition Increase pressure
Afterfilter dirty Change filter elements