11-2
CONTROL SYSTEM
Revision Y05-02 Service Manual - Delta DCI
Target frequency limits as a function of outdoor air temperature (OAT):
OAT Range Cool mode limits Heat mode limits
OAT < 6
MaxFreqAsOATC
No limit
6 ≤ OAT < 15 MaxFreqAsOAT1H
15 ≤ OAT < 28
MaxFreqAsOAT2H
28 ≤ OAT No limit
11.1.4 Frequency Changes Control
Frequency change rate is 1 Hz/sec.
11.1.5 Compressor Starting Control
11.1.6 Minimum On and Off Time
3 minutes.
11.1.7 Indoor Fan Control
10 Indoor fan speeds are determined for each model. 5 speeds for cool/dry/fan modes and 5
speeds for heat mode.
When user sets the indoor fan speed to a fixed speed (Low/ Medium/ High), unit will operate
constantly at set speed.
When Auto Fan is selected, indoor unit controller can operate in all speeds. The actual speed is set
according to the cool/heat load.
11.1.8 Turbo Speed
The Turbo speed is activated during the first 30 minutes of unit operation when auto fan speed is
selected and under the following conditions:
• Difference between set point and actual room temperature is bigger then 3 degrees.
• Room temperature > 22 for cooling, or < 25 for heating.
Frequency
Time
Min 10 Minutes
1
Minute
Step 1
Step 3
1
Minute
Step 2
To Next Page
