Lennox LNINVE052 Service Manual page 29

fan motor blows residual heat for a while at set speed to prevent high temperature inside the unit.
◆ When Tset+3.5℃＜ Tamb. ＜ Tset+5℃ , the unit will maintain its previous operation status.
◆ When the unit stops due to malfunction or protection, the compressor, IDU fan motor and ODU fan motor stop operation.
◆ In heating process, when Tamb. is quite different from Tset, the compressor will run in relatively high frequency for quick heating;
when Tamb. is near Tset, the compressor frequency will decrease automatically for high coziness and efficiency.
In this mode, the 4-way valve is energized. Temperature setting range is 16 ～ 30℃ .
② The indoor unit displays operation icon, heating icon and set temperature.
③ Defrost conditions and process
In order to ensure heating effect, the unit will defrost automatically according to the frost status of outdoor unit. Indoor unit displays H1
during defrosting (for some models, the display status is that heating icon is bright for a while and then off for a while).
④ Protection functions (See function protection of this section)
(6) Compressor control function
(1) The controller controls the operation frequency of compressor according to the relationship between ambient temperature and set
temperature and the changing speed of ambient temperature.
(2) When turning on the unit in cooling, heating or dry mode, the compressor starts after the ODU fan motor has operated for 5
seconds.
(3) The compressor stops immediately when turning off the unit, switching to fan modes and unit stops for protection.
(4) In each mode: once started, the compressor won't stop within 7 mins (note: including stop operation when reaching the temperature
point; not including malfunction protection, turning off the unit by remote controller or switching modes in which stopping operation of
compressor is needed).
(5) In each mode: once stopped, the compressor won't start again within 3 mins; if the unit is with memory function, the compressor can
be restarted without delay when turning off the unit and then energizing again.
(7) 4-way valve control function(not available for cooling only type)
(1) The 4-way valve is de-energized in cooling, dry and fan mode;
(2) The 4-way valve is energized in heating mode;
(3) When turning off the unit in heating mode or switching to other mode from heating mode, the compressor stops and the 4-way valve
is de-energized after a while;
(4) When the unit stops for protection, the 4-way valve is de-energized after a while;
(5) When starting defrosting, the compressor stops and the 4-way valve is de-energized after a while;
(6) When existing defrosting, the compressor stops and the 4-way valve is energized after a while;
3.Other control functions
(1) Timer function
General timer and clock timer functions are compatible by equipping remote controller with different functions.
timer precision is 30min and set unit ON/OFF after a desired hour.
◆ Timer ON: timer ON can be set at unit OFF. If selected ON time is reached, the unit will start to run according to previous setting
status. Time setting range is 0.5~24hr in 30-minute increments.
◆ Timer OFF: timer OFF can be set at unit ON. If selected OFF time is reached, the unit will stop. Time setting range is 0.5~24hr in
30-minute increments.
② Clock timer: the timer precision is 1min and set unit ON/OFF at a certain time every day.
26
T +5
preset
T +3.5
preset
T .
amb
7 min.
Compressor
Outdoor unit
Intdoor unit
Set fan speed
min.
Reversing
valve
Stop heating
Original operating status
Start heating
3 min. 7 min.
Set fan speed
min.
Service Manual
① General timer: the
Technical Information