Daikin LXE10E-A Service Manual page 42

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• By condenser fan
When the ambient temperature is low during the air-cooled operation, the condenser pressure
(high pressure) will decrease. Accordingly, the low pressure will decrease.
In order to prevent this situation, when the high pressure becomes set point or lower, the
condenser fan stops to prevent the high pressure from excess dropping.
When the high pressure becomes set point or higher afterwards the operation will be restarted.
This control varies upon dehumidification setting.
Dehumidification : OFF
High pressure ≦ 800kPa
OFF
F : Injection control
In order to decrease the discharge gas temperature, inject liquid refrigerant into the suction pipe.
• During normal compressor operation
The injection solenoid valve will be turned on or off to control the discharge gas temperature lower
than set point.
The control is conducted properly by using detected discharge gas temperature and inside
temperature.
Discharge gas temperature (DCHS) set value
ISV ON
ISV OFF
• Defrosting / Heat-up operation
Control the injection ON/OFF with charge control. For details, see the section of "charge control" on
page 2-29.
G : In-range control
In order to observe at a glance whether the refrigeration unit
properly controls the inside temperature or not, the orange
lamp on the display panel will light up when the control
temperature is near the set point temperature (SP).
H : In-range masking control
If the inside temperature is within the in-range when
defrosting is started, the in-range lamp will be kept turned on
forcibly for certain period as below regardless of the inside temperature thereafter.
This will avoid misunderstanding that there is a problem as the control temperature temporarily rises
during defrosting.
Setpoint ≧ –20.0˚C
Setpoint ≦ –20.1˚C
ON
High pressure > 1000kPa
Frozen, chilled (pull-down)
RS>0˚C
RS≦0˚C
120˚C 128˚C
103˚C 118˚C
90 minutes
120 minutes
2-28
Dehumidification : ON
High pressure ≦ 700~1800kPa
OFF
High pressure > 900~2100kPa
Chilled,
capacity control
113˚C
108˚C
Control
In-range lamp
temperature
SP+1 ˚C
SP
In-range lamp
SP– 2 ˚C
In-range lamp
ON
(OFF)
SP+ 2 ˚C
(ON)
SP–1 ˚C
(OFF)