Click here to make tpub.com your Home Page

Page Title: OPERATIONAL CHECKS - Continued
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home


   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 

TM5-4120-383-14
2-6.
OPERATIONAL
CHECKS.-Continued
If a knocking or pounding noise is heard when the
compressor starts in the following check, immediately
turn the MODE SELECTOR out of the COOL position.
Leave input power connected and wait at least two
hours before attempting another start in COOL mode.
k.  Turn the TEMPERATURE SELECTOR control knob to the fully
WARMER (clockwise) position, then turn the MODE SELECTOR switch to
Note that the evaporator and condenser fans start
COOL.
immediately and that the compressor starts approximately 30 seconds
later.  Hold your hand in the airflow from the conditioned air
supply louver: there should be no change in temperature.  Now turn
the TEMPERATURE SELECTOR control knob to the fully COOLER
(counterclockwise] position and feel the supply air temperature
begin to drop almost immediately. Leave controls in the present
position and perform the next check.
l.  After 15 minutes of operation check the sight glass to
determine the refrigerant condition.  The sight glass is equipped
with a center indicator that is moisture sensitive.  Dry
refrigerant is indicated by green, it turns to chartreuse when the
moisture content becomes undesirable and to yellow when the level
Excessive moisture in the refrigerant may
becomes unacceptable.
If the liquid
damage or possibly destroy the compressor.
refrigerant observed in the sight glass has a milky appearance or
frequent bubbles appear, the volume of refrigerant is low and the
Either moisture or low charge
system should be charged.
indications should be reported to direct support maintenance for
appropriate refrigeration system action.
Do not operate the air conditioner in the COOL mode
if the refrigerant color has reached the yellow band
or if numerous bubbles appear in the sight glass.
COOL mode operation may be continued with the
refrigerant color in the chartreuse band or with only
an occasional bubble appearing in the window, but the
sight glass should be rechecked after each four hours
of operation to insure that the condition has not
become worse.
Observe that all air
m.  Turn the MODE SELECTOR switch to OFF.
conditioner functions cease.
2-11

Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business