MAINTENANCE Teledyne API M751H High Performance Zero Air Generator
30 07773A DCN6833
5.2 Maintenance Mode When changing the media of the Charcoal Scrubber (Section 5.5) and the NO-NO2
Scrubber (Section 5.6), the new media will contain some moisture due to humid ity in
the ambient air, consequently triggering a dewpoint fault condition. Placing the 751H
in Maintenance Mode will override the f ault for 24 hours, allowing time to thoroughly
dry the new media before resuming normal operation of the 751H. (In high humidity
environments this may take longer).
To activate Maintenance Mode, first follow the instruction s for changing the media. At
the step when instructed to place the instrument in Maintenance Mode, locate the
hole in the bulkhead of the Instrument Panel. This hole is lined up with the
Maintenance Mode button on the Control Board (Figure 4-4); pass a blunt instrument
with a small diameter through the hole and press the button.
5.3 Cleaning 1. Occasionally, depending upon the local conditions, check the inside of th e 751H
for excessive dirt or dust.
2. Particularly, check the cooling fan, cooling coil and compressor fa n inlet.
3. Remove any dirt or dust with a vacuum cleaner.
Do not use an air jet. This will only redistribute the dirt and will not remove it.
5.4 Checking Tubing 1. Under the vibration of the compressor, it is possible for some parts o f the TFE
tubing to abrade against nearby objects. This is most likely to occur with the
tubing directly attached to the compressor.
2. Check to see if any signs of abrasion are present, and, if so, re -dress the tubing.
3. If any section of tubing appears to be heavily abraded, remove and replace it.
CAUTION
Do not loosen any tubing connection while the 751H is running.
CAUTION
BEFORE WORKING ON THE 751H PLUMBING TURN OFF THE
751H, WAIT FOR THE PRESSURE GAUGE TO READ ZERO. (THIS
MAY REQUIRE THAT YOU LOOSEN THE INSTRUMENT PANEL
BULKHEAD UNION TO ALLOW THE AIR TO BLEED AWAY.)