21
Inverter module Protection itself has a protection function against current, voltage and temperature. If these protections
happened, the corresponding code will display on indoor unit LED.
8.3.5 Sensor protection at open circuit and breaking disconnection
8.3.6 Indoor fan delayed open function
For all modes, when the units are turned on, the indoor fan can operate 10 seconds after the action of louver.
8.3.7 Compressor preheating function.
Preheating permitting condition:
If T4(outdoor ambient temperature
)＜
3
℃
and the machine connects to power supply newly or if T4
＜
3
℃
and
compressor has stopped for over 3 hours, the compressor heating cable will work.
Preheating mode:
A weak current flows through the coil of compressor from the wiring terminal of compressor, then the compressor is
heated without operation.
Preheating release condition:
If T4
＞
5
℃
or user turns on the machine and compressor runs, preheating function will stop.
8.3.8 Compressor heating cable
If outdoor temperature is lower than 5
℃
, the compressor heating cable begins to work. If outdoor temperature is higher
than 15
℃
, the compressor heating cable stops working.
8.4 Fan-Only Mode
8.4.1 Temperature setting function is disabled, and no setting temperature display.
8.4.2 In this mode, the action of louver is the same as in cooling mode.
8.4.3 The action of auto fan in fan-only mode is the same as auto fan in cooling mode with 24
℃
setting temperature.
8.5 Cooling Mode
8.5.1 After starting, the operation frequency of compressor submits to following rule.
When the machine is running and
ΔT(=room temp. – setting temp.) changes, the frequency of compressor will rise or
descend a grade (7 minutes after starting).
After start, if
ΔT stays in a zone for 3 minutes, the frequency will change as follow:
Zone A : Current frequency rise a grade till the maximum grade.
H
-1.0
B
3.0
-0.5
3.5
T1
–
24
medium
3.5
3.0
1.5
1.0
℃
high
low
A
Δ
T=
(ro
o
m
te
m
p
)
–
(s
e
tti
n
g
T
e
m
p
)
