Toyotomi MTN-MTG A128FS Service Manual page 32

8.4.3.5 Defrosting mode：
For 9k,12k models:
Condition of defrosting:
AC will enter defrosting mode if any of the following items is satisfied.
(1) Both A and B are satisfied
A: The compressor keeps running for 40 minutes.
B: The evaporator coil temp.T2-Indoor room temp.T1 meets the below table.
model
MTN A128FS
MTN A135FS
(2) After the last defrosting, the time that the outdoor fan is off but the compressor is on in high T2
protection cumulates up to 90 minutes.
Condition of ending defrosting:
If any one of the following items is satisfied, the defrosting will terminate and the machine will turn to
normal heating mode.
High speed
Medium speed
Low speed
Breeze/off
TH
DEFROST
14
14
T2－T1
＜TH
DEFROST
＜TM
DEFROST
＜TL
DEFROST
No need to compare the T2 and T1
TM
DEFROST
15
15
42
TM
DEFROST
16
16