3-4 ELECTRONIC EXPANSION VALVE CONTROL for Outdoor air unit
03-11
+1
3-5 DRAIN PUMP OPERATION for Outdoor air unit
1. Initialization
2. Operation Control
When starting up
Automatic operatic control
Automatic PI control is performed based on the indoor unit heat exchanger outlet temp and inlet temp.
Discharge airflow temperature control
The discharge airflow temperature is controlled so that it reaches to the set-up temperature based on the difference
between the discharge airflow temperature and the set-up temperature.
Cooling operation: 1) If the discharge airflow temperature becomes 9°F (5°C) lower than the set-up temperature,
EEV is fully closed.
2) If the suction airflow temperature becomes 1°F (0.5°C) lower than the set-up temperature,
EEV is fully closed.
Heating operation: 1) If the discharge airflow temperature becomes 9°F (5°C) higher than the set-up temperature
for 5 minutes or more, EEV is fully closed.
2) If the suction airflow temperature becomes 1°F (0.5°C) higher than the set-up temperature,
EEV is fully closed.
3. Special Control
(1) When cooling and refrigerant circulation starts, the drain pump starts simultaneously.
(2) The drain pump operates continuously for 3 minutes after the refrigerant circulation stopped.
(3) When the refrigent circulation is stopped by a start of indoor heat exchanger frost prevention
operation, the drain pump will turn off in 1 hour after the end of indoor heat exchanger frost
prevention operation.
(4) When the water level in the drain pan rises up and then the float switch functions:
Microcomputer stops the refrigerant circulation and indoor fan motor operation.
Drain pump operates continuously for 3 minutes after the float switch is turned off.
(Almost condensing water may be drained)
(5) When the float switch turns ON continuously for 3 minutes, 'FAILURE INDICATION' operates.
(6) When the float switch turns OFF within 3 minutes, the unit starts cooling operation.
1
2
When the power is turned ON.
When it has passed the limited time since the last initialization.
When indoor unit stopping by Thermo-OFF condition.
Oil recovery operation : Controlled pulse(Maximum 1400 puls)
Test run operation : Controlled pulse.
Freeze prevention control : Fully closed.
Vacuuming operation : Fully open.
Defrost operation : Controlled pulse(Maximum 1400 puls)
Outdoor unit Condition
EEV Condition
Cooling
Heating
Fully closed
Fully closed
(Cooling) Move to the cooling control base pulse in steps.
(Heating) Move to the heating control base pulse in steps.
OFF
Fully closed
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