Heating Mode - Heat Controller B-DVH09SD-0 Service Manual

Heat Controller
9.2.2 Outdoor Fan Operation - Cooling Mode
The outdoor fan operates based on the Outdoor
Ambient Temperature (T4):
T4
°F (°C)
22
72 (22)
20
68 (20)
When the outdoor ambient temperature T4 is
above 78°F(22°C), the outdoor fan runs high
speed, however when the temperature is below
this, the fan speed decreases to low and
continues to run at low speed when the
temperature is 68°F(20°C) or below.
9.4.2.3 Indoor Fan Operation-Cooling Mode
In cooling mode, indoor fan runs all the time
and the speed can be set to high, medium, low
or auto. When the fan is placed in auto mode,
while the unit is in cooling mode, the auto fan
operation takes into account the difference (ΔT)
in indoor room temperature (T1) and the set
point temperature (Ts):
ΔT =T1-Ts
ΔT°
4
3
1.5
1
When there is a 3 to 4 degree difference (ΔT) in
set and room temperatures, the fan runs high
speed. When the difference in temperature
(ΔT) is between 1 and 3 degrees, the fan speed
is medium. However, as the room temperature
begins to get closer to the set temp, within 1
degree or less temperature differential (ΔT), the
fan speed will run on low.
High
Low
High
Medium
Low

9.3 HEATING MODE

9.3.1 Compressor Operation-Heating Mode
The maximum operating frequency (Fmax),
follows the chart below based on the outdoor
ambient temperature T4:
T4
°F (°C)
93 (34)
34
92 (33)
33
83 (28)
28
81 (27) 27
71 (25)
25
75 (24)
24
72 (22)
22
70 (21) 21
66 (19)
19
18
65 (18)
63 (17)
17
61 (16)
16
59 (15)
15
57 (14)
14
54 (12)
12
52 (11)
11
43 (6)
6
41 (5)
5
21
DVC/DVH Inverter Mini-Split
Off
Fmax=F2
Fmax=F3
Fmax=F4
Fmax=F5
Fmax=F6
Fmax=F7
Fmax=F8
Fmax=F9
Fmax=F10