Click here to make tpub.com your Home Page

Page Title: Testing the Defrost System
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
   
   

 

TM 10-4110-262-13&P
0029 00
Testing the Defrost System
To test the defrost system, run the unit on Cool until the evaporator coil temperature is below 36 5.4 F and press
the manual defrost switch. If the unit doesn't switch to defrost cycle, proceed to step 1 (below).
Check the Evaporator Temperature.
NOTE
The evaporator coil temperature must be below 36 5.4 F or the unit will not
defrost. Use a test thermometer to check the evaporator temperature.
1. Check the defrost termination switch.
a. Place a jumper wire between both switch terminals.
b. Press the Manual Defrost switch.
c.If the unit shifts to Defrost, the defrost termination switch is defective.
3.
If the unit does not switch to Defrost, check for an open circuit in the 12 wire. If the 12 wire is not opened,
proceed to step 4.
4. Check voltage on PCB terminal of GR (grey) wire. If voltage is present, proceed to step 5.
5. Check for open circuit on wire GR that goes to the am-13 controller (Pin 8 C-9). If the wire GR is not open,
proceed to step 6.
6. Keeping the Manual Defrost switch pressed, check voltage on Pin 8 C-9. If voltage is present on Pin 8 C-9, and
the rest of the above mentioned points are correct, replace the Printed Circuit Board.
7. If voltage is not present on Pin 8 C-9, follow Cab Control Box troubleshooting directions.
0029 00-12

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

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