Service and Parts Manual (2016, 2017, 2018, 2019, 2020, 2021, 2022)

18 PB
Service Manual
Technical Information
18
Dual 8 Display and LED Display:
Two 8 segment nixie tube and 8 LED indicators (they are Auto, High, Low, Heat, Cool, Constant Fan, Power, STATUS(status indicator on
main board)).
1.Mode LED display: when the unit is running in a certain kind of mode, the corresponding LED is bight.
2.Power LED: In ON status, the power LED is on; In OFF status, the power LED is off.
3.Fan speed display: when the unit is running at auto, high or low fan speed, the corresponding LED is bright.
4.Dual 8 display: In cooling and heating mode, it defaults to display set temperature (In fan mode, it displays indoor ambient
temperature).
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“BLANK”+ “hundred’s place”.
6.Error display
After energization, STATUS LED is always on. When there is error or protection, STATUS LED blinks. Detailed display is as below
:In
OFF mode, dual 8 won’t display the error code (except the low temperature protection). In OFF status, number 8, 9 and 10 protection
marks will be eliminated.When multiple protections are overlapped, they will be displayed circularly without priority.
No. Error Name Display Way
1
Indoor ambient temperature sensor is open circuit and short
circuit
Dual 8 displays "F1", STATUS LED blinks once and goes out
for 3s circularly
2
Indoor tube temperature sensor is open circuit and short
circuit
Dual 8 displays "F2", STATUS LED blinks twice and goes out
for 3s circularly
3
Outdoor tube temperature sensor is open circuit and short
circuit
Dual 8 displays "F4", STATUS LED blinks four times and goes
out for 3s circularly
4 FJ error of air outlet temperature sensor Dual 8 displays "FJ"
5 Low temperature protection Dual 8 displays "FP"
6 Wrong wire connection for wired controller STATUS LED blinks 9 times and goes out for 3s circularly
7 High temperature protection for evaporator STATUS LED blinks 8 times and goes out for 3s circularly
8 High temperature protection for outdoor condenser STATUS LED blinks 6 times and goes out for 3s circularly
9 Freeze protection for evaporator STATUS LED blinks 5 times and goes out for 3s circularly
10 Frost protection(heat pump) STATUS LED blinks 7 times and goes out for 3s circularly
11 Refrigerant lacking protection Dual 8 displays "F0"
12 Overload detection protection Dual 8 displays "H3"
13 Compressor over-current protection Dual 8 displays "E5"
14 Protection for electric heater error Dual 8 displays "A2"
If there is an error of a temperature sensor, only the indoor fan will respond in cooling mode, other loads will not respond, but the buttons
are still valid.
6.2 Function Introduction
1.Cooling mode
Under cooling mode, cooling mode indicator is on and the set fan speed indicator is on. Dual 8 displays set temperature.
Working condition and process for cooling
ķ
When T
indoor amb.
+T
indoor amb. compensation
7
preset+2
o
F(1
o
C)
, the unit operates under cooling. Outdoor fan and indoor fan operates in set speed.
When the starting condition of compressor is reached, outdoor fan will operate and compressor will operate 10s later.
ĸ
T
indoor amb.
+T
indoor amb. compensation
7
preset-2
o
F(1
o
C)
, the unit sops operation. In this case, compressor and outdoor fan stop operation. Under indoor
fan cycle mode, indoor fan will stop operation after operating at set fan speed for 60s (except requiring the indoor fan to operate in
protection mode); if fan cycle mode is not selected, indoor fan will operate at set fan speed.
Ĺ
T
preset-2
o
F(1
o
C)
<T
indoor amb.
+T
indoor amb. compensation
<T
preset+2
o
F(1
o
C)
, the unit keeps previous operation status.
ĺ
When the indoor fan is set at high speed, outdoor fan operates according to high speed.
Ļ
When the indoor fan is set at low speed, outdoor fan operates according to low speed.
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operating for 3.5min and outdoor tube temperature is below 140
o
F(60
o
C), outdoor fan turns to low speed. First time of start-up includes:
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power failure.
Ľ
During cooling mode and there is no outdoor condenser high temperature protection, unit stops as reaching temperature point, unit stops
OPERATION
Function and Control