Service manual

11-2
CONTROL SYSTEM
SM DUO38 1-E.1 GB
11.3.2 Target Frequency Setting
The compressor target frequency is a function of the NLOAD number sent from the indoor
controller and the outdoor air temperature.
Basic Target Frequency Setting:
NLOAD Target Frequency
127
Maximum frequency
10 < NLOAD < 127 Interpolated value between minimum and maximum frequency
10
Minimum frequency
0 Compressor is stopped
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 < 24
MaxFreqAsOAT2H
24 ≤ OAT No limit
11.3.3 Frequency Changes Control
Frequency change rate is 1 Hz/sec.
11.3.4 Compressor Starting Control
\
11.3.5 Minimum On and Off Time 3 minutes
Frequency
Time
Min 10 Minutes
1
Minute
Step 1
Step 3
1
Minute
Step 2
CONTENT