11-2
CONTROL SYSTEM
SM HDDHED 2-A.1 GB
When the
Δ
D
value is small- decrease the frequency
When the
Δ
D
value is large- increase the frequency
3. Frequency management when other controls are functioning
When frequency is drooping;
Frequency management is carried out only when the frequency droops.
For limiting lower limit
Frequency management is carried out only when the frequency rises.
4. Maximum and minimum limits of frequency by PI control
The frequency upper and lower limits are set depending on indoor unit.
When low noise commands come from the indoor unit or when outdoor unit low noise or quiet
commands come from indoor unit, the upper limit frequency must be lowered than the usual
setting.
(see
11.1.2.1
)
11.1.3.1 Frequancy range
The compressor frequency limitation is set by the following table
Mode
Minimum Frequency(MinFreq)
Maximum Frequency(MaxFreq)
18
24
See following table
Cooling
12
12
Heating
12
12
The maximum allowed frequency is extracted from the following:
Mode
Night Mode
Maximum Frequency(MaxFreq)
18
24
Cooling
ON
80
80
OFF
90
90
Heating
ON
90
90
OFF
120
120
11.1.3.2
Frequency Changes Control
Frequency change rate is 1 Hz/sec.
11.1.3.3
Minimum On and Off Time
Prohibit to turn ON the compressor for 3 minutes after turning it off.(except during deicing
protection)
11.1.4
Indoor Fan Control
8 Indoor fan speeds are determined for each model. 4 speeds for COOL modes and 4 speeds for
HEAT mode.
Unit Model
Mode
Turbo(Super high)
High
Medium
Low
18
Cooling
1350
1100
950
800
Heating
1400
1200
1050
920
24
Cooling
1350
1150
1000
850
Heating
1350
1150
1000
850
In high/ medium/ low indoor fan user setting, unit will operate fan in selected speed.
