Heat Controller B-DVH09SD-0 Service Manual page 20

DVC/DVH Inverter Mini-Split
However, if the unit is turned on using the
remote control, the compressor will run at the
Fmax frequency for 7 minutes according to the
outdoor ambient temperature T4. But after 7
minutes, the operation will take into account the
difference (ΔT) in indoor room temperature (T1)
and the Set Point Temperature (Ts) and the
compressor frequency will operate as follows:
ΔT =T1-Ts
X ΔT°
3.5
A
3.0
2.5
2.0
1.5
1.0
0.5
-0.5
-1.0
The zones (A,B,C...H) shown on the chart
above correspond to the various compressor
running frequencies as a result (ΔT) of the
difference between T1-Ts. When the
temperature differential (ΔT) of T1-Ts remains
in the same zone for 3 minutes, the compressor
will run as follows:
In zones A thru E the ΔT is between 3.5 and 1
Degree, the compressor will continue to
increase the frequency until it reaches its
highest level where Fmax=F8.
In zone F, the compressor continues to run at
its current frequency when the temperature
differential (ΔT) is between 0.5 and 1 degree.
Once the temperature differential (ΔT) falls
below 0.5 degrees, the compressor's frequency
will decrease unit it reaches the lowest level
where Fmax=F1.
In zone H, where the ΔT is -1 degree or less,
the compressor will run at the lowest frequency
where Fmax=F1 for 1hour.
However, when the temperature differential (ΔT)
is less than -2 degrees, the compressor will
stop.
B
C
D
E
F
G
H
Additionally, the compressor running frequency
is always limited by the current. Therefore, the
running currents also must be taken into
account. I3COOL, I2COOL, and I1COOL
refer to different running current values in the
table below.
I
I3COOL
Decrease
I2COOL
I1COOL
Indoor units I1COOL
B-DVC09SD-0
B-DVH09SD-0
B-DVC12SD-0
B-DVH12SD-0
B-DVC18SD-1
B-DVH18SD-1
B-DVC24SD-1
B-DVH24SD-1
If the running current is too high (above
I3COOL) in the "Off" zone of the chart above,
the compressor will stop. Between I3COOL
and I2COOL, in the "Decrease" zone the
compressor will lower the frequency to the
lowest level. The "Hold" zone allows the
compressor to continue to run at the current
frequency. Note: When the unit is in "hold"
zone for 3 minutes, the compressor frequency
will rise to the next highest level. This rise in
frequency can occur twice at most while in this
zone. The "Resume" zone places no limitation
on the frequency.
18 20
Off
Resume
I2COOL I3COOL
(Amps) (Amps) (Amps)
13.0 14.0 15.0
13.0 14.0 15.0
13.0 14.0 15.0
13.0 14.0 15.0
10.0 11.0 13.0
10.5 11.5 13.0
12.0 13.0 14.0
12.0 13.0 14.0
Heat Controller
Hold