33
Technical Information
Service Manual
6.3 Introduction of Basic Mode Function
1. Temperature Parameter
◆
Indoor setting temperature (Tpreset)
◆
Indoor ambient temperature (Tamb.)
2. Basic Functions of System
A
fter the unit is energized, the interval of start-up time for compressor is no less than 3min under any conditions; when the compressor is
started, the unit is off without the temperature change in 6min.
2.1 Cool Mode
2.1.1 Working conditions and process of cooling
a) When Tabm.≥T 1°C(2°F), the unit will start to run in cooling mode, the compressor and draw water motor start to run, and fan
motor runs under preset fan speed.
b) When Tabm.≤ Tpreset - 1°C(2°F), the compressor and kick motor stop to run, and fan motor runs under preset fan speed.
c) When Tpreset - 1°C(2°F)<Tamb.<T 1°C(2°F), the unit will keep the current running status.Under this mode, the temperature
setting range is 16°C-30°C(61°F-86°F) .
a) Under cooling mode, after 1h of setting sleep process, Tpreset increases 2°F(1°C); 2h later, Tpreset increases 4°F(2°C). After 2h, the
setting temperature never increases, but the upper limit of increased setting temperature is 86o°F(30°C)
b) Under heating mode, after 1h of setting sleep process, Tpreset decreases 2°F(1°C); 2h later, Tpreset decreases 4°F(2°C). After 2h, the
setting temperature never decreases, but the upper limit of decreased setting temperature is 61°F(16°C)
c) There is no sleep function under fan and dry mode.
d) When set sleep function, shift mode will cancel sleep function.
e) The setting temperature display is the same with remote controller; it is not influenced by the setting temperature increases/ decreases.
2.2 Heating mode
When Tamb. ≤3°C(6°F), the unit operates in heating mode. Meanwhile, 4-way valve, compressor operates, and indoor fan
operates at cold air prevention condition;
When 3°C(6°F)<Tamb.<5°C(10°F), the unit keeps original operation status,
When Tamb.≥5°C(10°F), compressor stop operation simultaneously. 4-way valve stop operation after the compressor has
stopped for 2 minutes. Indoor fan operates at blowing residual heat conditioner.
Under this mode, the temperature setting range is 16-30°C(61-86°F).
3.3 Auto Fan
a) Auto fan speed under Cooling mode; Heating mode;
Tamb≥4°F(2°C) High fan; Tamb≤2°C(4°F), the upper fan operate at high fan speed;
Tpreset<Tamb.< 4°F(2°C) Med fan; 2°C(4°F)<Tamb<4°C(8°F), the upper fan operate at middle fam speed;
Tamb≤Tpreset Low fan; Tamb≥4°C(8°F), the upper fan operates at low fan speed;
b) There is 3.5min delay for auto fan shift.
c) Auto fan speed under
3.4 TIMER Function
● General timer
a) TIMER ON: It can set timer on when the system is off, the setting time range is 0.5h-24h, when the time of setting timer on reaches, and
the system runs with the previous setting mode.
b) TIMER OFF: It can set timer on when the system is on, the setting time range is 0.5h-24h, when the time of setting timer off reaches,
the system stop to work.
● Clock timer
a) TIMER ON: If set timer on when the system is running, it continues to run; if set timer on when the system is off, when the time of setting
timer on reaches, and the system runs with the previous setting mode.
b) TIMER OFF: If set timer off when the system is off, the system keeps the stand-by status when setting timer off; if set timer off when the
system is on, when the time of timer off reaches, the system stops to run.
3.5 Memory Function
The system memories the setting running status of previous power-off, and runs automatically with the setting running status before it
power-off when it is energized again. If the unit is on before power-off, the compressor will 3min delay protection when it is energized
again.
3.6 Indicator Lamp, dual-8 digital pipe
a) When the unit runs under cooling mode, cooling indicator lamp lights, dual-8 displays preset temperature.
b) When the unit runs under fan mode, fan indicator lamp lights, dual-8 does not display.
c) When the unit runs under dry mode, dry indicator lamp lights, dual-8 does not display.
d) When the unit runs under heating mode, heating indicator lamp lights, dual-8 displays preset temperature.
T1 ˚C
Tpreset –1 ˚C
Compressor
Outdoor fan
Indoor fan
Run
Tamb.
Stop
Stop cooling
Start cooling
Original operating status
≥ 6 min.
≥ 3 min.
≥ 6 min.
Setting fan speed
