Operating instructions

An element inside the sight glass indicates the moisture condition corresponding to a given element
color. If the sight glass does not indicate a dry condition after about 12 hours of operation, the
circuit should be pumped down and the filter-drier changed; or verify system condition by
performing an acid test on the compressor oil.
Preventive Maintenance Schedule
OPERATION WEEKLY
MONTHLY
(Note 1)
ANNUAL
(Note 2)
General
Complete unit log and review (Note 3) X
Visually inspect unit for loose or damaged components X
Inspect thermal insulation for integrity X
Clean and paint as required X
Electrical
Check terminals for tightness, tighten as necessary X
Clean control panel interior X
Visually inspect components for signs of overheating X
Verify compressor heater operation X
Test and calibrate equipment protection and operating controls X
Megger compressor motor * X
Refrigeration
Leak test X
Check sight glasses for clear flow X
Check filter-drier pressure drop (see manual for spec) X
Perform compressor vibration test X
Acid test oil sample X
Condenser (air-cooled)
Clean condenser coils (Note 4) X
Check fan blades for tightness on shaft (Note 5) X
Check fans for loose rivets and cracks X
Check coil fins for damage X
Notes:
1. Monthly operations include all weekly operations.
2. Annual (or spring start-up) operations includes all weekly and monthly operations.
3. Log readings can be taken daily for a higher level of unit observation.
4. Coil cleaning can be required more frequently in areas with a high level of airborne particles.
5. Be sure fan motors are electrically locked out.
* Never Megger motors while they are in a vacuum.
IMM ACZ/AGZ-4 ACZ / AGZ-BM 65