Carrier 42HVM109303 Service Manual page 41

8.4.6 Oil return
8.4.6.1 If the compressor running frequency is lower than 35Hz for 80 minutes, the frequency will be
raised to 58 Hz .The unit will keep running at 58Hz for 60 seconds and then run at former frequency.
8.4.6.2 If the unit is in defrosting mode, the oil return function is inactive.
8.4.6.3 Quit oil return if the unit has malfunction, protection or frequency limitation.
8.4.7 Forced operation function
8.4.7.1 Enter forced operation function:
When the machine is off, pressing the touch button will carry the machine to forced auto mode. If
pressing the button once again within 5 seconds, the machine will turn into forced cooling mode.
In forced auto, forced cooling or any other operation mode, pressing touch button will turn off the
machine.
8.4.7.2 In forced operation mode, all general protections and remote control are available.
8.4.7.3 Operation rules:
Forced cooling mode:
The compressor runs at F2 frequency and indoor fan runs as breeze. After running for 30 minutes. the
℃
machine will turn to auto mode as 24 setting temperature.
Forced auto mode:
℃
The action of forced auto mode is the same as normal auto mode with 24 setting temperature.
8.4.8 Timer function
8.4.8.1 Timing range is 24 hours.
8.4.8.2 Timer on. The machine will turn on automatically when reaching the setting time.
8.4.8.3 Timer off. The machine will turn off automatically when reaching the setting time.
8.4.8.4 Timer on/off. The machine will turn on automatically when reaching the setting "on" time, and
then turn off automatically when reaching the setting "off" time.
8.4.8.5 Timer off/on. The machine will turn off automatically when reaching the setting "off" time, and
then turn on automatically when reaching the setting "on" time.
8.4.8.6 The timer function will not change the AC current operation mode. Suppose AC is off now, it will
not start up firstly after setting the "timer off" function. And when reaching the setting time, the timer
41