Heat Controller Energy Knight B/A-HMC30AS Service Manual page 14

3. Cooling Operation Mode – 1st Stage
1) Initial start & indoor load decision stage
This stage is to decide load level of indoor and select operation compressor, which is operated according to
Table 1.
After initial start, 2nd and 3rd operating time of compressor are saved, for the purpose of selecting following
operation stage with the average value of before operated time.
- Using the average value(tm) of tm1 & tm2 and difference of outdoor temp. & desired temp., following(next)
operation stage of compressor is selected under the table 1.
- But, compressor would be restarted after 3 mins. of suspension, if it turns off.
2) If 100% compressor is selected, cooling operation-1st stage would be working.
3) If 40% compressor is selected, cooling operation-2nd stage would be working.
tm=(tm1+tm2)/2
4) Operation Diagram
Desired Temp.+0.5 C
Desired Temp.-0.5 C
Desired Temp.-1.0 C
Room Temp.
Desired Temp.
60 % ON
Comp
40 % ON
Outdoor Fan
MAX.
Indoor Fan
tm1
over 3 mins. over 3 mins.
OFF ON OFF
OFF ON OFF
OFF MAX. OFF
Controlled at the Indoor Unit
- 14 -
tm2
ON
ON
MAX.