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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Trane rtu(non heat pump) single stage controlled via t stat(no

Customer Question

Trane rtu(non heat pump) single stage controlled via t stat(no bas).....have correct power(460v) and at board I have 24v at R,G & Y.....fan blower comes on but condenser fan and compressor do not......there arent any fault codes.....I do have 24v at the low pressure cut off.....
Submitted: 2 years ago.
Category: HVAC
Expert:  BillyHvac replied 2 years ago.
hello,
did you run a test at LTB strip terminals TEST?
Customer: replied 2 years ago.
No,I have been out of the trade a few years and electrial was and is a work in progress...although I do remember doing that I wasnt entirley sure what to expect when I connect 1 & 2 at the test strip......
Expert:  BillyHvac replied 2 years ago.
if you have the panel with wiring on back...at top right is a test feature system.
Short test1 and 2 together and release..blower comes on, short again economizer (if present) opens, short again and cooling 1st stage...then 2nd, then heat etc.
What this does is test the mechanically while bypassing exterior controls and certain safetys