Brief Description Of Modes And Functions - Lennox LM009CI-100T432-1 Service Manual

6.2 Brief Description of Modes and Functions

1. Summary
(1) Buzzer
When the controller is energized or receives signal from button (emergency operation switch on air conditioner) or remote controller, the
buzzer will give out a beep.
(2) Display
◆ After energization, all icons will be displayed once Operation icon is in red under standby status. After turning on the unit by remote
controller, operation icon is bright and corresponding set operation mode icon will be displayed (Mode icon include: cooling, heating, drying).
(3) Temperature parameter
◆ Indoor set temperature (Tpreset)
◆ Indoor ambient temperature (Tamb.)
◆ Inner tube temperature of indoor evaporator (Ttube)
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; if the
◆ unit is on before power failure, the compressor will be restarted with an interval of 3 mins.
Once compressor is started, it won't stop within 6 mins according to the change of room temp.
(1) Auto mode
① Operation condition and process for auto mode
Under auto mode, the system will automatically select operation mode (cooling, heating, and fan) according to indoor ambient temperature.
There swill be 30s delayed for protection between mode switchover.
◆ When Tamb≥26°C, unit will be in cooling mode Ex-factory set temperature is 25°C
◆ Cooling only unit: When Tamb≤22°C, unit will be in fan mode Tpreset=25°C.
◆ For cooling and heating unit under condition that (19°C+Tcompensation) ＜ Tamb ＜ 26°C (For cooling only unit under condition that 22°C
＜ Tamb ＜ 26°C), when unit is initially turned on in auto mode, it will operate according to auto fan mode. When unit is changed to auto
mode from other modes, it will maintain its previous working status (If auto mode is turned on from drying mode, unit will operate according
to auto fan mode).
② Protection function is same as that under each mode.
(2) Cooling mode
① Operation condition and process for cooling mode
◆ When Tamb. ≥Tset+1°C, the system operates under cooling mode. In this case, the compressor, the ODU fan motor and the IDU fan
motor operates at set speed.
◆ When Tamb. ≤Tset-1°C, the compressor and the ODU fan motor stop, while the IDU fan motor operates at set speed.
◆ When Tset-1°C<Tamb. <Tset+1°C, the system will maintain its previous operation status.
In cooling mode, temperature setting range is 16~30°C.
Graphic instruction:
(Same as below)
20
Heating
indicator
Cooling
indicator
Power
indicator
Tpreset +1 ˚C
Tpreset –1 ˚C
Compressor
Indicates operation
Outdoor fan motor
Indicates stop
Indoor fan motor
Temp.
indicator
Display
Receiver
window
drying
indicator
Tamb.
6 min. 3 min. 6 min.
Set fan speed
Service Manual
Start cooling
Original operating status
Stop cooling
Technical Information