Aircel AHLD E-Series Installation And Operation Manual page 18

Aircel AHLD E-Series - Models 70 - 750
Maintenance (cont'd)
Semi-Annual Checklist
1. Remove and inspect all filters for excessive particulate loading and physical damage – if required
replace prefilters, afterfilters, pilot air filter and mufflers (filter elements should still be changed on
regular basis once a year maximum for a 1 shift operation. Change more frequently if operating 2
or 3 shifts such as every 6 months.).
2. Check pressure differential indicator and if it turns red, replace the element.
3. Remove exhaust mufflers. Knock out excess particulate and back flow with dry compressed air.
If particulate cannot be removed completely change the exhaust mufflers. Check backpressure
in regenerating tower, if more than a few psig on the pressure gauge, clean or replace exhaust
mufflers. (Change mufflers on a regular basis typically every 2-3 months for optimum performance)
4. Check desiccant condition. Powder in the mufflers is a indication of the status of the desiccant.
5. Check all solenoid valves - coil condition and control circuit.
6. Check dryer operation.
7. Inspect and clean inlet and outlet APV (Automatic Piston Valves).
Annual Checklist
1. Replace elements in prefilters, afterfilters, and pilot air filter.
2. Replace mufflers.
3. Recalibrate dewpoint analyzer probe (if used) send back to factory for recalibration.
4. Replace inlet and outlet APV valve seals.
5. Check dryer for proper operation.
18
WARNING!
• Before any service or maintenance
work is performed on the
refrigerated air dryer system,
disconnect power supply and lock
out power supply and depressurize
system.
• Follow proper lock out/tag out
procedures before performing
service or maintenance work.
• Follow all safety procedures prior to
performing any maintenance activity
on the dryer.