32 AGZ 010B through 034B IOMM AGZB1
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 controller’s display.
Lubrication
No routine lubrication is required on the AGZ 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 or severe personal injury or death can result.
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, be careful when using cleaners.
Care should be taken not to damage the fins during cleaning. All chemical cleaners should
be thoroughly rinsed from the coils.
Refrigerant Sight glass
Observe the refrigerant sight glass monthly. A clear glass of liquid indicates adequate sub-
cooled refrigerant charge in the system to ensure proper feed through the expansion valve.
Bubbling refrigerant in the sight glass indicates the system is short of refrigerant charge.
Sub-cooling should be verified to prevent overcharging. Refrigerant gas flashing in the
sight glass 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 sight glass indicates what
moisture condition corresponds to a given element color. If the sight glass does not indicate
a dry condition after about 12 hours of operation, the refrigerant or oil should be tested for
moisture.
To Next Page
Loading...
Need help?
General
