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IOM 1206-7 • TRAILBLAZER
™
MODEL AGZ CHILLERS
after 5 minutes and the module will lockout the compressor
after 10 consecutive Code 6 Alerts. Once locked out, a power
cycle or Modbus reset is required.
Code 7 – Reverse Phase: The module will flash the red Alert
LED seven times indicating a reverse phase in two of the three
compressor leads. The modules will lockout the compressor
after one Code 7 Alert. A power cycle or Modbus reset
command will be required to clear the lockout.
Code 8 – Reserved For Future Use
Code 9 – Module Low Voltage: The module will flash the red
Alert LED nine times indicating low module voltage for more
than 5 seconds. The Alert will reset after 5 minutes and the M2-
M1 contacts will close if the T2-T1 voltage is above the reset
value.
NOTE:
If a compressor with CoreSense Communications
fails in the field, the CoreSense module should
remain with the failed compressor so the
manufacturer’s technicians can download the
CoreSense data to assist with determining the root
cause of compressor failure.
Replaceable Core Filter-Driers
For units with replaceable core filter driers, the core assembly
of the replaceable core drier consists of a filter core held tightly
in the shell in a manner that allows full flow without bypass.
A condenser liquid line service valve is provided for isolating
the charge in the condenser, but also serves as the point from
which the liquid line can be pumped out. With the line free of
refrigerant, the filter-drier core(s) can be easily replaced.
Crankcase Heaters
The scroll compressors are equipped with externally mounted
band heaters located at the oil sump level. The function of
the heater is to keep the temperature in the crankcase high
enough to prevent refrigerant from migrating to the crankcase
and condensing in the oil during off-cycle.
Power must be supplied to the heaters 8 hours before starting
the compressors.
Evaporator
On AGZ-E models 030 through 180, the evaporator is a
compact, high efficiency, dual circuit, brazed plate-to-plate type
heat exchanger consisting of parallel stainless steel plates.
The evaporator is protected with an electric resistance heater
and insulated with 3/4” (19mm) thick closed-cell polyurethane
insulation. This combination provides freeze protection down
to -20°F (-29°C) ambient air temperature. The water side
working pressure of the brazed plate type of evaporator is 653
psig (4502 kPa). Evaporators are designed and constructed
according to, and listed by, Underwriters Laboratories (UL).
On AGZ-E models 190 through 240, the evaporator is a direct-
expansion, shell-and-tube type with water flowing in the baffled
shell side, and refrigerant flowing through the tubes. The
evaporator has an insertion heater and is insulated with 3/4”
(19 mm) thick vinyl nitrate polymer sheet insulation, protecting
against water freeze-up at ambient air temperatures to -20°
F ( 29° C). An water thermostat controls the heater cable.
The fitted and glued-in-place insulation has a K factor of 0.28
Btu in/hr ft2 ºF at 75°F. The water side working pressure of
the shell-and-tube type of evaporator is 152 psig (1048 kPa).
Each evaporator is designed, constructed, inspected, and
stamped according to the requirements of the ASME Boiler and
Pressure Vessel Code. Double thickness insulation is available
as an option.
Phase Voltage Monitor (Optional)
Factory settings are as follows:
• Trip Delay Time: 2 seconds.
• Voltage Setting: set at nameplate voltage.
• Restart Delay Time: 60 seconds.
Summary of Contents for AGZ030E
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