Dry Mode; Forced Operation; Timer Function - Heat Controller B-DVH09SD-0 Service Manual

Heat Controller
Indoor fan will run in auto fan mode and the
louver will operate based on the mode selected
automatically (Heat, Cool, Fan-Only).
Notes:
• If the unit switches between heating
and cooling modes automatically, the
compressor will stop for 15 minutes and
re-select the mode according to the ΔT
conditions.
• If the setting temperature is modified,
the machine will choose running
function again based on ΔT.

9.7 Dry mode

9.7.1 Dry Model Fan Speed and Louver
Function
Indoor fan speed is fixed at breeze speed and
can't be changed. The louver angle will operate
the same as it does in cooling mode.
9.7.2 Compressor Operation in Dry Mode
ΔT =T1-Ts
ΔT°
2.5
2.0
1.5
1.0
0.5
0.0
In Dry mode, the compressor's frequency will
decrease from F3 to F1, as the temperature
difference (ΔT) between indoor room
temperature (T1) and the Set point temperature
(Ts) decreases from 2.5 to 0 Degrees.
9.7.3 Low Room Temperature Protection
In dry mode, if room temperature is lower than
50°F(10°C), the compressor will stop and will
not resume operation until room temperature
exceeds 54°F(12°C).
9.7.4 Additional Protections in this Mode:
Evaporator anti-freezing, condenser high
temperature protection and Compressor
F3
F2
F1
F1
frequency and Outdoor fan are all limited in the
same method that they would be in the cooling
mode.

9.8 Forced Operation

Note: See Forced Operation information in the
Installation instructions.
When the unit is off, pressing the AUTO/COOL
button on the indoor unit, under the main cover
panel, will force the unit into auto mode. If the
AUTO/COOL button is pressed again within 5
seconds of the first time it was pushed, the
machine will go into forced cooling mode.
Pressing the AUTO/COOL button again, any
time after 5 seconds of the first time it was
pushed, will turn off the unit. In forced
operation mode, all general protections and
remote control are available.
9.8.1 Operation rules:
Forced cooling mode:
The compressor will run at Fmax=F2 frequency
and indoor fan runs in breeze mode. After
running for 30 minutes this way, the unit will
then run in auto mode with 75°F(24°C) set
temperature (Ts). Note: See Auto-Mode
section of this manual for more information.

9.9 Timer function

9.9.1 Timer Range
The timer range is 24 hours and is relevant time,
which means it is the time that has elapsed
from the time the timer is set.
9.9.2 Timer On
The unit will turn on automatically when the
Timer On set time is reached.
9.9.3 Timer Off
The unit will turn off automatically when the
timer off set time is reached.
9.9.4 Timer On/Off
The unit will turn on automatically when the
Timer On set time is reached and then the unit
will automatically turn off when the timer off set
time is reached.
9.9.5 Timer Off/On
The unit will turn off automatically when the
timer off set time is reached and then
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