Toshiba HFCR407C - Capacity Calculation; Oil Level Valve Detection Control

56
11
Outline of control
Outdoor unit
Item Operation explanation and applied data, etc. Remarks
2b. Outdoor fan (1) Heating fan control
control 1) The number of waves is controlled according to the TE sensor temperature.
2) If TE >20°C is constantly detected for 5 minutes, the operation will automatically
shut down. This is the same condition as when the thermostat automatically
becomes switched off, thus the operation will automatically start again.
3) When the above condition (2) persists and the high pressure SW operates,
check the suction area of the indoor unit for blockages. Ensure that the filter is
clean and start the operation.
4) After the fan is switched on, this control does not operate during defrost mode.
TE temperature
(°C) A zone: minimum, compulsory stop timer count
B zone: 2/20 seconds (down to the minimum)
C zone: 1/20 seconds (down to the minimum)
D zone: hold (maintain the current rate)
E zone: +1/20 seconds (up to the maximum)
F zone: Maximum revolutions number (16)
Fixed-speed/slave units not operating will maintain the ODU fan at 1 wave to prevent
refrigerant from remaining in the ODU Heat Exchanger.
3. Capacity By the capacity request command from the indoor controller, the inverter operation
calculation command of the master outdoor unit, ON/OFF control of the fixed-speed compressor
and the slave outdoor unit are determined. The master outdoor unit sets up activation
priority order of the slave outdoor units connected to the system, and starts the operation.
<Example of 30HP system>
20
6
4
2
1
(HP)
30
25
20
15
10
5
1
Operation capacity
Inverter
Fixed
51015202530(HP)
Requested HP
4. Oil level valve 1) The volume of oil in the oil tank is judged by the detection temperature of TK1 and
detection TK2 sensors.
control 2) The present temperature detected by TK1,TK2 and TK3 sensors are stored in
memory as the initial value, and then the solenoid valve SV3C is activated. Sampling
of TK1,TK2 and TK3 sensor temperature occurs and the temperature change
between TK1 and TK2 is judged. If the judgement is such that a reduction in oil is
present the oil equalizing control function starts.