Table 2-1. Operator Preventive Maintenance Checks and Services - Continued
Item to Check/
Not Fully Mission
The sight indicator must not be inspected
when the DEFROST IN PROGRESS
indicator is on.
The sight indicator can be viewed looking
Inspect sight indicator port for constant bubbles or
Sight indicator port shows
foaming and note center indicator color. If constant
constant bubbles or foam.
bubbles or yellow indicator are seen, shut down
Center indicator color is
refrigeration unit and notify direct support
maintenance to leak check and evacuate
refrigeration system as necessary.
(Oil Level Sight
The sight glass must not be inspected when
the DEFROST IN PROGRESS indicator is
The sight glass can be viewed looking
through the front top panel.
Safe operating level is between 1/4 and 1/2
way up the sight glass.
Inspect the sight glass port for low or high oil level
Sight glass port oil level
and foaming If oil level is out of safe operating
above or below safe
range or foaming, shut down refrigeration unit and
operating range or
notify direct support maintenance to leak check and