Heat Controller Energy Knight B/A-HMC30AS Service Manual page 20

8. Heating Operation - 3rd Stage
1) Condition to decide operation stage
a. [Restart Time of 40% compressor] should be examined, when the Room Temp. falls and stays under [ Desired Temp. -
0.5°C] over 1 minutes after suspension of 40% compressor operation.
If [Restart Time of 40% compressor] pass, 40% compressor would be restarted.
If [Restart Time of 40% compressor] doesn't pass, the current condition should be maintained until it reaches and 40%
compressor would be restarted after passing some times.
b. 60% compressor operation would be suspended when the room temperature goes to [Desired Temp. +1.0°C] after sus-
pension of 40% compressor operation.
60% & 40% compressors operations would be all suspended when the room temperature goes to [Desired Temp. +0.5°C].
c. 40% compressor would be started when the Room Temperature is maintained between [Desired Temp. +1.0°C] and
[Desired Temp. -0.5°C] more than 1 hour after suspension of 40% compressor operation.
2) Condition to shift following operation stage
: It shifts from the operation stage during load and shows condition to perform following operation stage.
a. It operates Heating Operation-1st Stage when operation such as the above ®Ë of a. in the 1) item is performed in a series
of 2 times.
b. It operates Heating Operation-4th Stage, when operation such as the above b. of 1) in a series of 2 times and the average
time in 2 times of [60% single operation] is within 3-minutes.
3) Operation Diagram
Room Temp.
Desired Temp. +1.0 C
Desired Temp. +0.5 C
Desired Temp.
Desired Temp. -0.5 C
40%
Comp.
60%
Outdoor
Fan
Indoor Fan
1min
.
8 mins.
OFF OFF ON
ON
ON
ON
OFF ON
M
MAX. MAX. MAX.
A
X
.
Controlled at the Indoor Unit
1min
8 mins.
8 mins.
OFF ON OFF
ON
ON ON
MAX. MAX. MAX.
.
- 20 -
off
ON
ON
on
MAX. MAX.
.