12
motor turns to low speed; When T<H
℃
, compressor, indoor and outdoor fan motor return to normal running
( there is 3 minutes protection for compressor).
3.4.6 Heating overload working: (not available for cooling-only type air
conditioner)
When Trc
≥
A
℃
, the unit enters heating overload protection. If indoor fan speed is set at low or breeze
level, it will turn to medium speed automatically; if indoor fan speed is set at medium speed, it will turn to
high speed; When Trc
≥
B
℃
, outdoor fan motor stops. When indoor pipe temp. drops to
D
℃
, outdoor fan
motor will restart working. Air conditioner will exit overload protection when Trc drops to
E
℃
, compressor
restarts working, Indoor fan motor runs at the set fan speed.
When Trc
≥
C
℃
and the build-up time of compressor running is for more than 5 minutes, compressor
will be stopped. When indoor pipe temp. drops to
E
℃
, outdoor fan motor will returns to normal running.
Note:
When entering
heating overload operation, louver blades are in position 3 and return to the original
position.
3.4.7 Defrosting:
3.4.7.1
Defrost entry conditions
：
Defrost condition has three branches which has something in common:
☆
A Compressor is running.
☆
B Compressor has been running for more than 10 minutes.
Difference between the three branches
：
A. The first branch:
a.
When the temperature of indoor pipe begins to descend, the sum of descending value has
reached or exceeded 3
℃
and the temperature of indoor pipe will not go up in 3 minutes.
b.
The build-up time of compressor running is for more than 40 minutes.
c.
TOC <-1
℃
d.
TRC- TR <18
℃
B. The second branch:
a.
The build-up time of compressor running is for more than 48 minutes.
b.
T
OC
<-5
℃
c.
The present value is 3
℃
lower than the lowest value of T
OC
re in 12 minutes after the unit has
started.
C. The third branch:
a.
The build-up time of compressor running is for more than 27 minutes.
b.
T
OC
<-20
℃
for more than 20 seconds.
Note
：
When the system has entered heating overload protection and has not existed from protection, the
unit can not enters defrosting; Users can only test defrosting conditions after existing from protection for 3
minutes.
