Service and Parts Manual (2021, 2022)

16 PB
OPERATION
Sequence of Operation
4. Heating mode (for Cooling & Heating pump)
When in heating operation mode, the set temperature, fan speed and air direction can be adjusted, compressor does not operate, but electrical
heater works, and indoor fan motor starts up 10s later.
a ST-RT≥ 33.8°F electrical heater operates
b ST-RT < 30.2°F electrical heater stops.
c 30.2°F ≤ST-RT < 33.8° electrical heater keeps the original works status .
Indoor fan motor control
4.1 Indoor fan motor could control by Auto, Low, Med or High speed circularly.
4.2 Indoor fan motor Auto works as follow:
a) In heating mode: T=ST-CRT
b) T 32°F, running in low speed
c) T=35.6°F, in medium speed
d) ≥ 39.2°F,in high speed .
e) 35.6°F < T < 39.2°F , the fan speed keeps in medium or high speed as it’s originally preset, but if the fan was
originally in low speed, it will change to medium.
f) 32°F ≤ T < 35.6°F , the fan speed keeps in low or medium speed as it’s originally preset, if fan in high speed, it
will change to medium speed.
g) When fan speed changes due to the temperature variation , it could be changed only by sequence as High, Med to
Low speed or Low, Med to High speed , and each status keeps at least 2 minutes.
 












35.6° F
39.2°F
5. Fan mode
In FAN mode, the corresponding indicator is ON, fan motor runs according to the set speed (default High speed for the first time), compressor doesn’t
work, Buzzer and PCB do not respond while pressing the UP/DOWN button on remote controller, the fan motor is adjustable in high, medium or low
speed, but no auto wind, 88 digital display shows environment temperature.
6. Sleep mode
6.1 In SLEEP mode, the indoor fan motor runs at low speed, except that the power source and sleep LED is ON, the
running LED and others light are OFF, the condition of timer LED is according to the preset, and all the LEDs will be
OFF after 30 seconds.
6.2 Temperature control
Processing SLEEP while in Cooling or Heating mode, unit runs according to the sleeping operation.
runing time
ST(F) ST(F)
runing time runing time
ST(F)
runing time
ST(F)
runing time
ST(F) ST(F)
runing time
≥82
60 60
no change
60
no change
60
no change
60
no change
60
no change
80
60
82
no change
60 60
no change
60
no change
60
no change
60
no change
78
50
80
60
no change
82
60 60
no change
60
no change
60
no change
77
40
78
50
no change
80
60 60
no change
60
no change
60
no change
75
30
77
no change
40
78
50
80
60 60
no change
60
no change
73
30
75
30
no change
77
40
78
50
80
60 60
no change
71
30
73
no change
30
75
30
77
40
78
50
80
60
no change
≤70
03
4
30
5 8
0
5 75
0
5 9 1
04
10 9
05
80
Fan speedset speed
UP/DOWN swing ON/OFF
initial set
Ite m
temp.(F)
The controlled
set temperature.
Note:unit---
Time: minute
set speed
keep original
low speed low-low speed
keep angle for cold air prevention
The 1st change The 2nd change The 3rd change The 4th change The 5th change The 6th change