26
27
If users switch on the unit by remote control, the compressor will run at the Fmax frequency for 7 minutes according to the outdoor
ambient temperature. During the 7 minutes, the frequency limitation is active. 7 minutes later, the compressor running frequency will be
controlled as below:
3.5
3.0
2.5
2.0
1.5
1.0
0.5
-0.5
-1.0
A
B
C
D
E
F
G
H
I3COOL
I2COOL
Off
Decrease
Hold
Resume
I1COOL
Temp. zone
A
B
C
D
E
F
G
Frequency
F8
F8
F7
F6
F5
F3
F1
Note:
When T
1
-Ts remains in the same temperature zone for 3 minutes, the compressor will run according to the following:
A~E: Increase the frequency to the higher level until reaches F8.
F: Maintain the current frequency.
G: Decrease the frequency to the lower level until it reaches F1.
H: Run at F1 for 1 hour (if T
1
-Ts < -2°, the compressor will stop)
Meanwhile, the compressor running frequency is limited by the current.
Off:
Compressor stops.
Decrease:
Decrease the running frequency to the lower level.
Hold:
Maintain the current frequency.
Resume:
No limitation for frequency.
Note:
When unit is in the “hold” zone for 3 minutes, the
compressor frequency will rise to the higher level. (The maximum
amount frequency will increase is 200%)
8.4.2.2 Outdoor fan running guidelines
8.4.2.3 Indoor fan running rules
In cooling mode, the indoor fan runs continuously and the speed
can be selected as high, medium, low and auto. Auto fan in
cooling mode acts as follow:
8.4.2.4 Condenser temperature protection
• 55° < T
3
< 60°, the compressor frequency will decrease to
the lower level until to F1 and then runs at F1. If T
3
< 54°, the
compressor will keep running at the current frequency.
• T
3
< 52°, the compressor will not limit the frequency and
return to the original frequency.
• T
3
> 60° for 5 seconds, the compressor will stop working until
T
3
< 52°.
8.4.2.5 Evaporator temperature protection
• T
2
< 0°, the compressor will stop and restart when T
2
≥
5°.
• 0°
≤
T
2
< 4°, the compressor frequency will be limited and
reduced to the lower level
• 4°
≤
T
2
≤
7°, the compressor will maintain the current
frequency.
• T
2
> 7°, the compressor frequency will not be limited.
22
20
High
Low
4
3
High
Low
1
Medium
1.5
8.4.3 Heating Mode
8.4.3.1 Compressor running guidelines
The maximum operating frequency of the compressor after
starting is determined by the diagram below:
If users switch on the unit by remote control, the compressor will
run at the Fmax frequency for 7 minutes according to outdoor
ambient temperature. During the 7 minutes, the frequency
limitation is active.
Fmax=F3
Fmax=F5
Fmax=F7
Fmax=F9
Fmax=F10
Fmax=F8
Fmax=F6
Fmax=F2
34
Off
33
28
27
25
24
22
21
19
18
16
17
15
14
Fmax=F4
12
11
6
5
E963_Lennox Luna Inverter Service Manual 1c.indd 26-27
E963_Lennox Luna Inverter Service Manual 1c.indd 26-27
13/12/11 4:43 PM
13/12/11 4:43 PM
