9.3. OUTDOOR UNIT OPERATION (CU-3E23CBPG/CU-4E27CBPG)
9.3.1. Room Temperature Control
9.3.1.1. Cooling, Dry and Heating Operations
Concerning CU-3E23CBPG and CU-4E27CBPG compressor frequency control
1. Immediately after the compressor has started up during an ongoing operation, the initial frequency is determined on the
basis of the information obtained from the heat exchanger capacities of the indoor units (thermostat ON) and the airflows
set by their remote controls.
2. During an ongoing operation, the difference between the temperature set in each of the rooms and the room temperature
is detected, the total load is calculated, and the compressor frequency is determined on the basis of this information.
3. When one room turns the thermostat OFF while two or more indoor units are operating, the automatic expansion valve
closes to restrict the flow of refrigerant, the compressor control is temporarily suspended, and both the initial frequency and
total load are determined again.
4. When the thermostat is turned OFF during 1-room operation, the outdoor unit´s compressor and fan stop. (The outdoor
unit’s fan stops 60 seconds after the compressor.)
5. It takes about 180 seconds for the compressor to be restarted after it has stopped. (Re-start control)
9.3.2. Deice Operation Control <Heating>
1. When the temperature of the heat exchanger drops below the deice operation start temperature during a heating operation,
deice operation is started, and when it rises above the release temperature, deice operation is released.
2. To prevent needless deicing or excessively long deicing, the deice operation start temperature is changed each time in such a
way that deicing is completed in the specified time.
·
Specified time: 4 to 7 minutes
·
When the time required for deicing is longer than the specified time, the deice operation start temperature is raised by 1 °C.
·
When the time required for deicing is shorter than the specified time, the deice operation start temperature is lowered by 1
°C.
·
The start temperature is changed in the range of -3 to -15.5 °C.
3. Deice operation is not performed during the guarded periods given below.
·
For a cumulative total of 35 minutes after operation started and after deicing was completed
·
For 5 minutes after the compressor started
4. In order to reduce the noise of the 4-way valve switching, the switching is done after the compressor has been stopped
temporary.
5. The deicing time is at most 10 minutes.
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CS-ME7CKPG / CS-ME10CKPG / CS-ME12CKPG / CS-ME14CKPG / CS-ME18CKPG / CU-2E15CBPG / CU-2E18CBPG / CU-3E23CBPG / CU-4E27CBPG
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