COMFORT-AIRE A-DVC09SF-0, Service Manual

Page: 22 / 56

Service Manual - DVC 09/12/18/24 SF Series
22
25
7.3 Main Protection
7.3.1 Three minutes delay at restart for
compressor
1 minute delay for the 1
st
time start-up and 3
minutes delay for others.
7.3.2 Temperature protection of compressor
top
The unit will stop working when the
compressor top temp. protector cut
s off, and
will restart after the compressor top temp.
protector restart
s .
7.3.3 Temperature protection of compressor
discharge
Compressor discharge temp. TP> 239°F for
5s, compressor stops.
7.3.4 Fan speed is out of control
When indoor fan speed run s too low
( ≤ 300RPM) for certain time, the unit will stop
and the LED will display the failure
7.3.5 Inverter module protection
The Inverter module has a protection function
for current, voltage and temperature. If these
protections happen, the corresponding code
will display on indoor unit and the unit will stop
working.
7.3.6 Indoor fan delayed open function
When the unit starts up, the louver will be
active immediately and the indoor fan will open
7s later.
If the unit runs in heating mode, the indoor fan
will also
be controlled by anti-cold wind
function.
7.3.7 Compressor preheating functions
Preheating permitting condition:
When T4(outdoor ambient temperature)
＜
3°C ,
the preheating function will be activated.
7.3.8 Sensor protection at open circuit
and breaking disconnection.
When there’s only one temperature sensor in
malfunction , the air conditioner will keep
working but show the error code, in case of
any emergency use.
When there’s more than one
temperature sensor in malfunction, the air
conditioner will stop working.
7.3.9 Refrigerant leakage detection
This function is only active in cooling mode. It
can better prevent the compressor being
damaged by refrigerant leakage or compressor
overload.
Open condition:
When compressor is active, the value of the
Coil temperature of evaporator T2 has no
change or very little change.
7.3.10 Zero crossing detection error
protection
If AC detects time interval is not correct for
continuous 240s, the unit will stop and the LED
will display the failure. The correct zero
crossing signal time interval should be between
6-13ms.
7.4 Operation Modes and Functions
7.4.1 Fan mode
( 1) Outdoor fan and compressor stop.
(2) Temperature setting function is disabled,
and no setting temperature is displayed.
(3) Indoor fan can be set to
high/med/low/auto.
(4) The louver operates same as in cooling
mode.
(5) Auto fan:
a
b
c
d
T1
e
7.4.2 Cooling Mode
7.4.2.1 Compressor running rules
When T1-Ts< ΔT -2
℃
, the compressor will stop,
when T1
—
Ts > ΔT -0.5
℃，
the compressor will
be activated.
ΔT is the programmed paramet er of
temperature compensation.