Heat Controller B-DVH09SD-0 Service Manual page 22

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
ΔT°
+5.0
+4.5
+3.5
+3.0
+2.5
+2.0
+1.5
+1.0
+0.5
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:
When the ΔT is between 0.5 and 2.5 Degrees,
in zones A thru E, the compressor frequency
will increase until it reaches the highest level
Fmax=F10.
In zone F, where the ΔT is 3 Degrees, the
compressor will continue to run at the current
frequency.
Once the ΔT is between 3.5 and 5 degrees in
zone G, the compressor will decrease the
frequency to its lowest level where Fmax=F1.
When ΔT is above 5 Degrees in the H zone, the
compressor will continue to run at Fmax=F1 for
1hour.
When ΔT is greater and 6 degrees, the
compressor will stop.
H
G
F
E
D
C
B
A
Additionally, the compressor running frequency
is always limited by the current. Therefore, the
running currents also must be taken into
account. I3HEAT, I2HEAT, and I1HEAT refer to
various running current values, see chart.
I
I3HEAT
Decrease
I2HEAT
I1HEAT
Indoor Unit
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 I3HEAT)
in the "Off" zone of the chart above, the
compressor will stop. Between I3HEAT and
I2HEAT, 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.
22
20
Heat Controller
Off
Hold
Resume
I1HEAT I2HEAT I3HEAT
(Amps) (Amps) (Amps)
6.5 7.5 8.5
14.0 15.0 16.0
6.0 7.0 8.0
14.0 15.0 16.0
9.0 10.0 11.0
10.5 11.5 13.0
11.0 12.0 13.0
12.0 13.0 14.0