Daikin LX10F10A, Service Manual

Page: 22 / 126

1-17
●
Pump down control
Pump down with EEV closed before defrosting initiation,
before heating operation, or during the start-up control
of the compressor. Collect refrigerant into the receiver,
and terminate the pumping-down when the low pressure
becomes -40kPa (or EOS-LP(T)>30
℃ ).
●
Automatic pump down
Automatic pump down is executed by pumping down with
the LSV closed before replacement of dryer or collecting
refrigerant. Terminate pump down when low pressure
becomes -27kPa. Then open HSV to raise the pressure
on the low pressure side slightly higher than atmospheric
pressure so that replacing the dryer afterwards can be
done easily. (Refer to paragraph 4.2.)
1.5 User Specifications
1.5.1 ASC, Automatic Setpoint Change
(Option)
●
ASC operation
This function works only in the chilled mode. It
is necessary to automatically change the set
temperature over time for some types of cargoes.
ASC function can specify the set temperature and
its duration according to the plan.
●
Setting for ASC operation
1. The first set temperature SP1 and its duration
TM1
2. The second set temperature SP2 and its duration
TM2
3. Since, up to 9 patterns are available for setting
temperature (i.e.up to SP9). There is no duration
limit by the timer for the last set temperature.
＊ For some types of cargoes, dehumidification
control settings can be configured as well.
＊ The temperature inside is raised gradually
(0.5 ℃ /Hr) to prevent rapid temperature rise
during the pull up operation.
●
Access to ASC operation
Access to ※ 2-5 ASC settings for ASC operation in
paragraph 2.3.
●
Display
During ASC operation "ASC" is displayed in the
SET-MODE area.
Press or key to check the ASC status during
operation display. The example below that among
five sets of temperature settings, the third set is in
operation remaining 15 hours to go.
●
Cancellation of ASC operation
1. Cancellation of ASC operation
1) When configuring ASC to "OFF"
2) When F-PTI is completed
3) When Chilled-PTI is completed
4) When Frozen-PTI is completed
2. When the power is turned off (unit off) during
ASC operation, ASC operation restarts at next
power-on.
3. It is impossible to change the set temperature
and the set duration during ASC operation. To
change the settings, configure ASC settings to
"OFF" once and "ON" again.
4. The last set temperature is displayed on the
modem. The settings cannot be changed via the
modem.
5. The following items are recorded as event log:
ASC "ON" / "OFF", SP1, TM1, dHU1,
"ON" / "OFF", RH1, SP2 ----, SP3 ---
SP1
SP2
SP3
TM1 TM2 TM3
ASC function starts to operate
Pull down
Pull down
Pull up
Timer TM1
Count Starts
CHILLED
RETURN 4.1C
HP:1200kPa LP: 20kPa
MODULATION
SET POINT
2.0 ℃
DEF-INT 12HR
SET-HU 70%RH
SET-MODE
DEHUMID
ASC
HUMID 75%RH
SUPPLY
2.1 ℃
No.
Automatic Setpoint Change
Operation screen
ASC screen
▼
▲
▼
▲
SP(C) SHU(%) Hr REMAIN
1
2
3
4
5
-10.0
0.0
10.0
15.0
20.0
--
80
80
80
80
100
10
20
50
LAST
0
0
15