Brief Description Of Modes And Functions - Lennox LNINVE052 Service Manual

6.2 Brief Description of Modes and Functions

Models:LNINV5210 LNINV6310
1 General introduction
(1) Buzzer
When the controller is energized or receives any command or signal from the buttons or the remote controller, the buzzer will give out a
beep.
(2) Display
After energizing, the unit will display all icons. Under standby status, running
indicating icon is displayed in red. If the unit is started by remote controller,
running indicating icon is displayed in green (the color may be different for
different models); meanwhile, the icon of current running mode will be displayed
(mode icons: cooling, heating and dry mode).
(3) Temperature parameters
◆ Indoor set temperature (Tset)
◆ Indoor ambient temperature (Tamb.)
◆ Indoor evaporator inner tube temperature (Tinner tube)
◆ Indoor condenser outer tube temperature (Touter tube)
◆ Outdoor discharge pipe temperature (Tdischarge)
◆ Outdoor IMP module temperature (Tmodule)
2.Introduction of basic mode function
Once the compressor is energized, there should be a minimum interval of 3 mins between two start-ups.
If the unit is with memory function and is off before power failure, the compressor can be restarted without an interval of 3 mins after the
system is energized; if the unit is on before power failure, the compressor will be restarted with an interval of 3 mins.
Once started, the compressor won't stop within 7 mins according to the change of room temp.
(1) Auto mode
① Auto mode conditions and process
In this mode, the unit will automatically select its operation mode (cooling, heating or fan) according to the change of indoor ambient
temperature. There is a 30-second delay protection for mode switchover.
◆ When Tamb.≥26℃ , the unit runs in cooling mode; in this case, the factory default set temperature is 25℃ .
◆ For cooling and heating model: when Tamb.≤22℃ , the unit runs in heating mode; in this case, the factory default set temperature is
20℃ .
◆ For cooling only model: when Tamb.≤22℃ , the unit runs in fan mode; in this case, the factory default set temperature is 25℃ .
◆ When 22 ℃ ＜ Tamb. ＜ 26 ℃ : the unit will run in fan mode when it enters auto mode just after power on; the unit will keep the
previous operation mode when it enters auto mode from cooling, heating or fan mode; the unit will run in fan mode when it enters auto
mode from dry mode.
② The indoor unit displays the operation icon, operation mode icon and set temperature, but set temperature can't be adjusted.
③ Protection functions are the same as those in any other mode. (See function protection of this section)
(2) Cooling mode
① Cooling conditions and process
◆ When Tamb. ≥Tset-0.5℃ , the unit starts cooling. In this case, the compressor and the ODU fan motor run, and the IDU fan motor
runs at set speed.
◆ When Tamb. ≤Tset-2 ℃ , the compressor and the ODU fan motor stop after a few seconds, while the IDU fan motor runs at set
speed.
◆ When Tset-2℃＜ Tamb. ＜ Tset-0.5℃ , the unit will maintain its present operation status.
◆ When the unit stops due to malfunction or protection, the compressor and ODU fan motor stop, while the IDU maintains its present
operation status.
◆ In cooling process, when Tamb. is quite different from Tset, the compressor will run in relatively high frequency for quick cooling;
when Tamb. is near Tset, the compressor frequency will decrease automatically for high coziness and efficiency.
In this mode, the 4-way valve is de-energized (cooling only unit is without 4-way valve). Temperature setting range is 16 ～ 30℃ .
24
Dual-8 nixie
tube display
Cooling icon
Heating icon
(Display content or position may be different from above graphics, please
refer to actual products)
Service Manual
Receiver
Operation icon
window
Drying icon
Display
Technical Information