18
8.0 SCHEDULED MAINTENANCE
8.1 INTRODUCTION
ZEKS HEATSINK™ refrigerated air dryers require little maintenance. These dryers
utilize hermetically sealed compressors which do not require any lubrication. Fan
motors require lubrication at both oil ports every six months. ZEKS recommends
component inspection and service at regular intervals to obtain maximum perfor-
mance from your dryer.
8.2 REFRIGERANT CONDENSER
For standard dryers, regular inspection and cleaning of the condenser is
recommended. ZEKS dryers may be equipped with an optional ambient air filter
designed to protect the condenser from dirt and debris that can accumulate on the
condenser. For proper operation with this option, it is imperative that this filter be
inspected and cleaned on a regular basis. Annual replacement of the filter is
recommended. For applications where excessive dirt, dust or debris is encountered,
more frequent inspection and cleaning may be required.
• Start Dryer, using one of the following methods, depending on Start Mode setting:
Manual Mode - Press the ON pushbutton.
Auto Restart Mode - No additional action required
Remote Automatic Mode - Close the remote contact.
• For HeatSink™ dryers, the circulating pump will be energized and will run continu-
ously. Provided the CHILLER TEMPERATURE is greater than the Compressor
Off Set point plus 4° F and the anti-short cycle delay and crankcase heater delay
have timed out, the refrigeration system will energize. As the system operates
and thermal mass temperature drops, the suction pressure will be lowered to
between 30 and 50 psig.
After the alarm delay, provided the Chiller Temperature is greater than the HIGH
TEMPERATURE ALARM set point, the dryer will go into HIGH TEMPERATURE
ALARM. The LCD panel will indicate the alarm and the refrigeration system will
continue to operate. Pressing the SELECT DISPLAY button will permit viewing of
the available dryer parameters during this alarm condition. Note that the alarm
condition screen will reappear after approximately 30 seconds until the alarm
condition is cleared.
The CHILLER TEMPERATURE will gradually drop as indicated on the display.
Once the temperature falls below the HIGH TEMPERATURE ALARM set point, the
alarm will reset and the LCD panel will return to its default display. After the refrig-
eration system shuts off, air flow may be slowly introduced to the dryer.
• Drain settings should be checked as described earlier in this manual.
If power is removed from the dryer for less than two hours, the crackcase heater delay
will be automatically bypassed. If, however, the power is removed from the dryer for
more than two hours, the full crankcase heater delay must be observed.
NOTICE
To Next Page
Loading...
