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SERVICE ADVISORIES
The AUTO SENTRY W controller turns on an advisory when it detects operation which needs service
attention, but does not warrant shutting down the compressor. Some of these are normal maintenance
procedures, and are intended to serve as a reminder to perform routine service. Others are conditions
which can reduce the maximum compressor performance. It will remain in effect until reset. Check the
display during routine inspections, and perform maintenance as suggested. Refer to the troubleshooting
section for detailed information about each advisory.
Temperature advisories may be cleared while the unit is running by simply pressing the [ENTER] key. To
reset the service advisories, press the [STOP/RESET] key to stop operation of the compressor. After it
has stopped, disconnect power and service as required. After servicing, restore power and reset the
controller as indicated in the programming / maintenance section below.
PROTECTIVE SHUTDOWNS
The AUTO SENTRY W will shut down the unit following any fault detected in the following devices. Long-
term problems will have a brief blowdown period before fully shutting down. Following a shutdown, a
message will be displayed, with the top line indicating “SHUTDOWN” and the lower line indicating the
cause. The shutdown light will be steadily lit while the shutdown condition is present, or will flash if the
condition no longer exists. Refer to the troubleshooting section for detailed information about each
shutdown. To resume operation, the cause of the shutdown must be corrected and the controller reset by
pressing the [STOP/RESET] key.
Motor Protective Devices
- Overload heaters are furnished for the starter in the voltage range
specified. There are three (3) overloads in the starter of proper size for the starter and its enclosure.
Note that motor nameplate current must be multiplied by 0.577 for Wye-Delta starters. The display will
indicate that an overload relay has tripped. The overload relay is reset by pressing the button on the
relay itself, then the controller may be reset. Motor current (amps) and voltage must be measured in the
affected motor wiring to locate the cause for high current. Proper starter coil and contact action is also
monitored and errors in operation will cause a shutdown with the cause displayed as a starter or contact
error.
High Temperature
- The compressor is protected from high discharge temperature by a thermistor
probe located in the compressor discharge. The AUTO SENTRY W will shut the compressor down if
temperature exceeds 150
°
F (66
°
C) (or lower per user adjustment) or if rapid temperature rise is
detected. Shutdown will also occur if the temperature falls below freezing. The thermistor probe is also
checked for open or shorted circuits, and the display will indicate a fault, if found.
CAUTION
Machine damage will occur if compressor is repeatedly restarted after high
temperature stops operation. Find and correct the malfunction before resuming
operation.
Содержание PUREAIR EWC99C
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