Friedrich Chill Premiere Series Service Manual page 16

Sequence of Operation
3. Heating mode
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≥ 1.8°F electrical heater operates
b ST-RT < 1.8°F electrical heater stops.
c 1.8°F ≤ST-RT < 1.8° electrical heater keeps the original works status .
Indoor fan motor control
4.1 Indoor fan motor can be controlled by Auto, Low, Med or High speed.
4.2 Indoor fan motor Auto works as follow:
a) In heating mode: T=ST-CRT
b) T 0°F, running in low speed
c) T=3.6°F, in medium speed
d) ≥ 7.2°F,in high speed .
e) 3.6°F < T < 7.2°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) 0°F ≤ T < 3.6°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.
4. 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 not auto , 88 digital display shows environment temperature.
5. 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.
initial set
I te m
temp.( )
The controlled
set temperature.
Note:unit---
Time: minute
Fan speed set speed
UP/DOWN swing ON/OFF
16
OPERATION
Temperature drop
°
7.2 F
High speed
°
3.6 F
Medium Speed
°
0
F
Low Speed
The 1st change The 2nd change
runing time ST( ) runing time
60 60
no change
60 60
50 60
40 50
30 40
30 30
30 3 30
30 30
set speed low speed
keep original
The 3rd change
ST( ) runing time ST( ) runing time
60
no change no change
60
no change no change
60
no change
60
no change
50
40
30
0
keep angle for cold air prevention
Temperature Rise
7.2°F
3.6° F
The 4th change The 5th change
ST( ) runing time ST( )
60 60
no change no change
60 60
no change no change
60 60
no change no change
60 60
no change no change
60 60
no change no change
50 60
no change
40 50
9 1 40 10 9
0
low-low speed
The 6th change
runing time ST( )
60
no change
60
no change
60
no change
60
no change
60
no change
60
no change
60
no change
50