Eco Air CTBU-09HWFN1-M(C), Service Manual, Page: 107 / 219

104
0 .0 °C ( 0 °F )
T 1 - T d + 1 . 5 °C ( 3 4 .7 °F )
L
( H + - L ) * 0 .2 + L
( H + - L ) * 0 .4 + L
( H + - L ) * 0 .6 + L
H +
( H + - L ) * 0 .8 + L
- 1 °C ( - 1 .8 °F )
- 2 °C ( - 3 .6 °F )
- 3 °C ( - 5 .4 °F )
- 4 °C ( - 7 .2 °F )
- 5 °C ( - 9 °F )
- 6 °C ( - 1 0 .8 °F )
- 6 .5 °C ( - 1 1 .7 °F )
15.4.3.3 Defrosting mode
If any one of the following items is satisfied, AC
will enter the defrosting mode.
After the compressor starts up and keeps
running, mark the minimum value of T3 from
the 10th minutes to 15th minutes as T30.
1)If the compressor cumulate running time is up
to 29 minutes and T3< TCDI1, T3
＋
T30SUBT3ONE
≦
T30.
2)If the compressor cumulate running time is up
to 35 minutes and T3< TCDI2, T3
＋
T30SUBT3TWO
≦
T30.
3)If the compressor cumulate running time is up
to 29 minutes and T3< TCDI3 for 3 minutes.
4)If the compressor cumulate running time is up
to 120 minutes and T3<-15
℃
(5°F).
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
：
Compressor
Outdoor fan
4-Way valve
X1 10S
10S
no longer than 10min
X2
15.4.3.5 Evaporator coil temperature
protection
T E s to p
T 2
R e s u m e
O ff
D e c r e a s e
T E d o w n
T E H 2
H o ld
Off: Compressor stops.
Decrease: Decrease the running frequency to
the lower level.
Hold: Keep the current frequency.
Resume: No limitation for frequency.
15.4.4 Auto-mode
This mode can be chosen with remote
controller and the setting temperature can be
changed between 17~30
℃
(63~86°F).
In auto mode, the machine will choose cooling,
heating or fan-
only mode according to ΔT (ΔT
=T1-Ts).
ΔT=T1-Ts
Running mode
ΔT>2 ℃
(3.6°F) Cooling
-2
℃
(-3.6°F)
≤ΔT≤2
℃
(3.6°F)
Fan-only
ΔT<-2 ℃
(-3.6°F) Heating
Indoor fan will run at auto fan of the relevant
mode.
The louver operates same as in relevant mode.
If the machine switches mode between heating
and cooling, the compressor will keep stopping
for 15 minutes and then choose mode
according to T1-Ts.
If the setting temperature is modified, the
machine will choose running function again.
15.4.5 Drying mode
Drying mode works the same as cooling mode
in breeze speed.
All protections are active and the same as that
in cooling mode.
15.4.6 Timer function