Chilled Mode - Daikin LX10F11B Service Manual

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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 FULL
COOL, MODULATION,
COOLING OFF or
HEATING is displayed
on the upper right of the screen. SUPPLY
temperature (SS) is displayed under SET POINT.
●Operation mode
FULL COOL＜Pull down＞
Compressor runs at full capacity, ESV opens and
economizer is activated. EFM runs with high speed.
MODULATION
When SS drops to ≦SP, unit will enter to modulation.
Compressor speed is adjusted in response to
difference temperature between SS and SP.
COOLING OFF (HEATING 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 modulation.
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.
Reheat coil (option)
LPT
HPT
HPS
Compressor
MODULATION
SUPPLY
RETURN 2.0C
▲
▼
EFM
Evaporator
PRV
HSV RSV
DMV
1-12
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 Modulation as
mentioned above.
●Condenser Fan Motor, CFM
CFM will run with high, low or OFF in response to
high pressure (HPT). (High Pressure Control)
Falling Temperature
Full cool
Economized
cooling
SP
-0.3℃*
-0.5℃*
Note: Setting values marked with * will vary
depending on the operating conditions.
Operation Flow in Chilled Mode
Valve chamber
EEV
EMV
ESV
CFM
Condenser
Receiver
Sight glass
Rising Temperature
with
+5.0℃*
Modulation
+0.5℃*
+0.3℃*
SP
Cooling OFF
(Heating OFF)
Heating
Economizer
LSV
Dryer