1. Railway passenger car air conditioning works in two working conditions: "half cold" and "full cold". Taking the hard-seat carriage as an example, two compressors are started under the "semi-cold" condition, and four compressors are started under the "full-cold" condition.

2. The allowable working temperature of semi-cold is outdoor temperature greater than 19℃ and indoor temperature greater than 23℃. Fully cold state: 2 fans are running, with a delay of 5 seconds, and 2 condensing fans are running; Delay for another 30 seconds