Daikin LX10F10A, Service Manual

Page: 17 / 126

1-12
1.4.2 Chilled Mode
●
Set Point and Control Temperature Sensor
Unit operates in chilled mode between Set Point
+30.0
℃ 〜 -9.9 ℃ controlled by the supply air
temperature sensor (SS).
●
Display
CHILLED is displayed
on the upper left
and PULL-DOWN,
MODULATING,
Cooling OFF or
HEATING is displayed
on the upper right of
the screen. SUPPLY temperature (SS) is displayed
under SET POINT.
●＜
Pull-down operation
＞
Compressor runs at full capacity, ESV opens and
economizer is activated, which is the same as frozen
mode. EFM runs with high speed.
＜
Modulated Cooling
＞
When SS drops to ≦ SP, unit will enter to the
modulated cooling. Compressor speed is
modulated in response to temperature difference
between SS and SP.
＜
Cooling OFF
＞
When SS drops to
≦
SP-0.3
℃
(
※
), unit will enter to the
Cooling OFF and compressor stops. If SS temperature
rises to
≧ SP+0.5 ℃ ( ※ ), the unit will return to the
modulated cooling.
EFM runs with high or low speed in response to SS.
(
※ : Control value varies depending on operating
condition.)
＜
Heating
＞
When SS is ≦ SP-0.5 ℃ ( ※ ), unit will be in heating
operation. A hot gas is adopted for the heat source,
which is same as defrost mode. The operation is
same as defrost mode except EFM runs with high
speed.
●
Evaporator Fan Motor, EFM
EFM runs at High or Low speed in modulated
cooling mode as mentioned above. EFM runs
always high speed only or low speed only
depending on user's requirement.
●
Condenser Fan Motor, CFM
CFM will run with high, low or OFF in response to
high pressure (HPT). (High Pressure Control)
Compressor
CFM
RSV HSV
DMV
Valve chamber
Economizer
Reheat coil (option)
Condenser
Receiver
HPT
HPS
EMV
ESV
LSV
Drier
EEV
LPT
Sight glass
Evaporator
EFM
PRV
RETURN 2.0C
▲
▼
SUPPLY
-0.5
℃
SP
SP
+0.5
℃
Falling
Temperature
+0.3
℃
Rising
Temperature
-0.3
℃
+5.0
℃
Operation Flow in Chilled Mode
Heating
Pull-down
with
Economized
cooling
Modulat
ed
Cooling
Cooling OFF