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CONTROL
4.7.9 Module temperature protection control
This control protects the module from abnormally high temperatures.
Normal operation
Module temperature ≥ Tf2
↓ ↑
Module temperature ≤ Tf0
Low discharge temperature protection, error code C7 is displayed
When the module temperature rises to or above Tf2, the system displays C7 protection and the unit shuts down.
When the module temperature drops to or below Tf0-1, the compressor enters re-start control.
2,1 - 3.1 4.1 - 5.1 6.1-7.1-8.1 6.1T-7.1T-8.1T 9.1 10.1 12.1 14.1
Tf2
75 81 100 84 88 88 88 88
Tf0
69 75 94 78 81 81 81 81
4.8 Special controls
4.8.1 Oil return operation
In order to prevent the compressor from running out of oil, the oil return operation is enabled to recover oil that has
flowed out of the compressor and into the refrigerant piping.
The oil return operation starts when the following condition occurs:
• when the compressor cumulative operating time with a rotation speed less than 42 rps reaches 6 hours.
The oil return operation ceases when any one of the following three conditions occurs:
• oil return operation duration reaches 5 minutes,
• compressor stops.
4.8.1.1 Component control during oil return operation in cooling mode.
Component
Refer to wiring
diagram
Control functions and states
DC inverter compressor COMP Runs at oil return operation rotation speed
Fan FAN Controlled according to cooling mode
Electronic expansion valve EXV 304 (steps)
4-way valve STF*/STF1** O
* Single-phase version
** Three-phase version
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