IOMM ACZ1 ACZ 010A through 039A
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System Maintenance
General
On initial start-up and periodically during operation, it will be necessary to perform certain routine
service checks. Among these are taking electric leg readings. Some readings are readily available on
the MicroTech II display.
Lubrication
No routine lubrication is required on the ACZ units. The fan motor bearings are of the permanently
lubricated type and require no lubrication.
Electrical Terminals
WARNING
Electric shock hazard. Disconnect and tag-out all sources of power to the unit
before continuing with following service.
Normal heating and cooling of the wire will cause terminals to loosen. Retighten all power electrical
terminals every six months.
Condensers
Condensers are air-cooled and constructed with 3/8” (9.5mm) O.D. internally finned copper tubes
bonded in a staggered pattern into slit aluminum fins. No maintenance is ordinarily required except
the occasional removal of dirt and debris from the outside surface of the fins. Use locally purchased
foaming condenser coil cleaners for periodic cleaning of the coil. Condenser cleaners may contain
harmful chemicals. Wear protective gear and read and follow manufacturer's safety instructions.
Take care not to damage the fins during cleaning. All chemical cleaners should be thoroughly rinsed
from the coils.
Refrigerant Sightglass
Observe the refrigerant sightglass monthly. A clear glass of liquid indicates adequate sub-cooled
refrigerant charge in the system to provide proper feed through the expansion valve. Bubbling
refrigerant in the sightglass indicates the system is short of refrigerant charge. Sub-cooling should be
verified to prevent overcharging. Refrigerant gas flashing in the sightglass could also indicate an
excessive pressure drop in the line, possibly due to a clogged filter-drier or a restriction elsewhere in
the system. The sightglass indicates what moisture condition corresponds to a given element color. If
the sightglass does not indicate a dry condition after about 12 hours of operation, the refrigerant and
oil should be tested for moisture.
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