Troubleshooting Guide

3.2 Abbreviation
Unit element abbreviations
Abbreviation Element
T1 Indoor room temperature
T2 Coil temperature of evaporator
T3 Coil temperature of condenser
T4 Outdoor ambient temperature
Ts Set temperature
Td Control target temperature
TP Compressor discharge temperature
In this manual, such as TCE1, TCE2...etc., they are configurable
parameters of EEPROM.
3.3 Fan Mode
When fan mode is activated:
• The outdoor fan and compressor are stopped.
• Temperature control is disabled and no temperature
setting is displayed.
• The indoor fan speed can be set to high, medium, low,
or auto.
• The louver operations are identical to those in cooling
mode.
• Auto fan: In fan-only mode, AC operates the same as
auto fan in cooling mode with the temperature set at
24°C(75.2°F).
3.4 Cooling Mode
3.4.1 Compressor Control
Cooling temperature compensation(ΔT5) is a configurable
parameter of EEPROM. Its value ranges from -2°C to 2°C.
The default value is 0.
• When T1-Ts < ΔT5-2 °C (3.6 °F), the compressor ceases
operation.
• When T1-Ts > ΔT5+3°C (5.4 °F), the compressor
continues operation.
• When the AC is operating in mute mode, the
compressor operates at a low frequency.
• When the current exceeds the preset value, the current
protection function activates and the compressor
ceases operation.
3.4.2 Indoor Fan Control
• In cooling mode, the indoor fan operates continuously.
The fan speed can be set to high, medium, low, or auto.
• If the compressor ceases operation when the
configured temperature is reached, the indoor fan
motor operates at the minimum or configured speed.
• The indoor fan is controlled as below:
Setting fan
speed
Actual fan speed
H+(H+=H+G)
A H(=H)
B
C
M+(M+=M+Z)
D M(M=M)
E
F
L+(L+=L+D)
G L(L=L)
H
I
T1-Td °C(°F)
L
L-(L-=L-D)
H
H-(H-=H-G)
M
M-(M-=M-Z)
• The auto fan acts using the following logic:
a
b
c
d
T1-Td
e
3.4.3 Outdoor Fan Control
Case 1:
• The outdoor unit will be run at different fan speed
according to T4 and compressor frequency .
• For different outdoor units, the fan speeds are
different.
Case 2:
• The outdoor unit will be run at different fan speed
according to T4.
• For different outdoor units, the fan speeds are
different.
3.4.4 Condenser Temperature Protection
When condenser temperature is more than setting value,
the compressor ceases operation.
3.4.5 Evaporator Temperature Protection
When evaporator temperature drops below a configured
value, the compressor and outdoor fan cease operation.
3.5 Heating Mode(Heat pump units)
3.5.1 Compressor Control
Heating temperature compensation(Δ T3) is a configurable
 Product Features 5 