35
Similar to the clogged filter switch, adjustment may be necessary for the no air flow switch(s).
The loss of airflow switch is wired in the normally closed position to open on airflow and the
dirty filter switch is wired to the normally open position and set to close with dirty filter.
Adjustment can be made by removing the top cover and turning the dial to the proper pressure.
See Figure 9 below.
Figure 15: Air Pressure Differential Switch
16
GENERAL MAINTENANCE
General maintenance must be performed in regular intervals to provide continued operation of the
entire unit. The maintenance intervals must be determined site specifically. Use the maintenance
checklist at the end of this manual when performing maintenance. Typically, air filters should be
replaced no less than two times per year.
The filters should be checked and changed periodically. When they become dirty, an alarm is activated
the filter pressure switch. If the filters are dirty, they must be changed for efficient operation of your
system. To check the alarm indicator, cover approximately 75% of the return air opening; the alarm
should energize. If the alarm energizes prematurely or does not energize when it should, adjust the
filter switch. All doors to machine should remain closed before determining whether an adjustment is
necessary. Spare filters should be kept in stock. Filters should be checked monthly and replaced if
necessary.
The maintenance intervals must be determined site specifically. Use the maintenance checklist
at the end of this manual when performing maintenance. In order to ensure that the
refrigeration system runs trouble free for many years, a follow-up maintenance program
(consisting of a minimum of two inspections per year) should be set up. A qualified refrigeration
service mechanic should carry out this semi-annual inspection. The main power supply
must be
disconnected and locked off
to avoid accidental startup of the equipment.
ADJUSTMENT
KNOB
TOP COVER
Summary of Contents for CAG-30 Series
Page 18: ...18 Figure 4 Typical Unit Field Piping Connection...
Page 37: ...37 17 REFERENCE DOCUMENTS...
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