76 TGZ 040A through TGZ 190A OMM TGZ-1
System Maintenance
General
To provide smooth operation at peak capacity and to avoid damage to package components,
a program of periodic inspections should be set up and followed. The following items are
intended as a guide to be used during inspection and must be combined with sound
refrigeration and electrical practices to provide trouble-free performance.
The liquid line sightglass/moisture indicator on all circuits must be checked to be sure the
glass is full and clear and the moisture indicator indicates a dry condition. If the indicator
shows that a wet condition exists or if bubbles show in the glass, even with a full
refrigerant charge, the filter-drier element must be changed.
Water supplies in some areas can tend to foul the TGZ heat exchangers to the point where
cleaning is necessary. The fouled vessel will be indicated by an abnormally high
condensing pressure or low evaporating pressures and can result in nuisance trip-outs. To
clean the vessels, a chemical descaling solution should be used according to the
manufacturer’s directions. A 40-mesh strainer is required in the water inlet to the
evaporator.
The compressor oil level must be checked periodically to be sure the level is at the center of
the oil sightglass. Low oil level can cause inadequate lubrication and oil must be added, use
oils referred to in “Compressor Oil Level” section below.
A pressure tap has been provided on the liquid line downstream of the filter-drier and
solenoid valve but before the expansion valve. An accurate subcooled liquid pressure and
temperature reading can be taken here. The pressure read here could also provide an
indication of excessive pressure drop through the filter-drier and solenoid valve due to a
clogging filter-drier.
Note
: A normal pressure drop through the solenoid valve is approximately 3 psig (20.7 kPa)
at full load conditions.
!
CAUTION
Warranty may be affected if wiring is not in accordance with specifications. A blown fuse or
tripped protector indicates a short ground or overload. Before replacing fuse or restarting
compressor, the trouble must be found and corrected. It is important to have a qualified
control panel electrician service this panel. Unqualified tampering with the controls can
cause serious damage to equipment and void the warranty.
!
Warning
The panel is always energized to ground even though the system switch is off.
If it is necessary to de-energize the complete panel including crankcase heaters,
pull the main unit disconnect. Failure to do so can result in serious personal injury.
If motor or compressor damage is suspected, do not restart until qualified service personnel
have checked the unit.
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