Daikin LXE10E-A14 Service Manual page 33

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J : Charge and release control
Charge control or release control is executed to maintain the heating capacity optimum in defrosting
and heating operation.
• Charge control
qThe suction pressure (LPT) is detected and the injection
solenoid valve (ISV) is turned on, then, liquid refrigerant is
charged into the suction pipe.
wThe discharge pressure (HPT) is detected and the injection
solenoid valve (ISV) is turned on, then the liquid refrigerant is
charged into the suction piping.
• Release control
The discharge pressure (HPT) is detected and the condenser
fan (CFM) is turned on, then, the refrigerant is released into the
condenser.
K : Pump down stop
Before the thermostat turns OFF and at the start of defrosting, close liquid solenoid valve (LSV)
to conduct pump down operation and recover refrigerant in the receiver. When the low pressure
reaches –50kPa or lower, the pump down is terminated.
L : Economizer control
The economizer circuit for which the intermittent injection to scroll compressor and the refrigerant
heat exchanger are combined, is adopted in the unit.
The economizer circuit enables the liquid refrigerant to have wide range of subcooling resulting in a
significant increase of cooling capacity.
• Economizer solenoid valve (ESV) control
Frozen mode: ON with return air temperature (RS) of 5˚C or lower
Chilled & partial frozen mode: ON with return air temperature (RS) of 5˚C or lower during pull-down
M : Dehumidification ※If reheat coil and humidity sensor (Optional) is equipped:
The unit have dehumidification control by a reheat coil, which is under the evaporator coil. To
execute dehumidification, controller setting is required. (Refer to Page 3-12)
In dehumidification, the Reheat Solenoid Valve (RSV) opens to give high pressurized refrigerant to
reheat coil. The "DEHUMID" LED lamp will light up.
The following setting can be made:
1) Dehumidification range: 60%RH–95%RH
2) Evaporator fan speed: Alternating (High–Low alternative operation every 1 hour)
operation
During capacity control, the control does not turn ON.
High speed, Low speed
2-19
LPT ＞ 70 kPa
OFF
LPT ＜ 40 kPa
HPT ＞ 800 kPa
OFF
HPT ＜ 700 kPa
HPT ≦ 1150 kPa
OFF
HPT ＞ 1200 kPa
ON
ON
ON