Gree U-MATCH GFH09K3CI, Service Manual

Page: 31 / 264

A/A DC INVERTER U-MATCH AIR CONDITIONERS CONTROL
28
2.4 Defrosting
O N
O N
O F F
O N
Z
H eating/D efrosting T im e sequence chart
D efrosting
m arking
D efrosting frequency
C om pressor
35H z
O utdoor fan
E nergized
D e-energized
Indoor fan
A uxilary pow er
D efro sting
e nds
C o nd ition for e n din g
the d efrost
O F F
O FF
T im e
M eet the conditions for
ending the defrost
A cc.to the conditions for
starting the auxiliary pow er
C old air prevention
F ixed step Y
A djust according to control logic
H igh fan
35H z
A djust per P I
A cc. to outdoor fan control logic
E X V
4-w ay valve
10s
3 m in
10s
The conditions for starting the defrosting are as follows:
The defrosting is started when one of the following three conditions is satisfied:
①
The total time for outdoor defrost sensor to run below 3 is longer than 40 minutes and this temperature is kept
℃
lower than -6 for over 3 minutes.
℃
②
The outdoor temperature sensor keeps lower than 3
℃
for at least 80 minutes and keeps lower than -4
℃
for at
least 3 minutes.
③
The outdoor temperature sensor keeps lower than 3
℃
for at least 120 minutes and keeps lowers than -3
℃
for
at least 3 minutes
The conditions for ending the defrosting are as follows:
The defrosting is ended when one of the following three conditions is satisfied:
When the temperature of outdoor heat exchanger rises to higher than 10 .
① ℃
When the temperature of outdoor heat exchanger rises to higher than 8 and this lasts for over 80 seconds.
② ℃
When the defrosting keeps for 10 minu
③
tes.