Pioneer LISAS-B-1403 Service Manual page 112

Electrical Control Function
1.3.3.4 Defrosting mode：
For 12K-18K Units
Condition of defrosting:
----T4＞0℃,
Defrosting starts when either of the following ①&②:
①The units run with T3＜3℃ for 40 minutes and T3 keeps lower than TCDI℃ for more than 3 minutes.
②:The units run with T3＜3℃ for 80 minutes and T3 keeps lower than (TCDI+2)℃ for more than 3 minutes..
----T4＜0℃,
If ①and ② are satisfied, then the program judges if T2 has decreased more than 5℃.When T2 has
decreased more than 5℃, enter the defrosting mode.
----No matter what value of the T4 is and whether the T2 drops more than 5℃ or not, if the machine runs
with T3＜3℃ for more than 120 minutes and T3 keeps lower than (TCDI+4)℃ for more than 3 minutes, the
machine will enter defrosting mode.
Condition of ending defrosting:
If any one of the following items is satisfied, the defrosting will finish and the machine will turn to normal
heating mode.
----T3 rises to be higher than TCDE1℃.
----T3 keeps to be higher than TCDE2℃ for 80 seconds.
----The machine has run for 10 minutes in defrosting mode.
 Defrosting action：
For 12K units：
Compressor
4-way valve
Outdoor fan
Indoor fan
110
no longer than 10min
60s
on 10s F8
F2
on
on
off
off
on
off
breeze 10s
30s
off
on
off
on
Electrical Control System