Lennox VHA 30, Installation Operating & Maintenance Manual, Page: 12 / 46

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5. Heating Mode Operation
The unit will operate according to the setting by the remote controller and the operation diagram is shown as
following.
Intake Air Temp.
Setting Temp.
(Compressor ON)
Setting Temp. -1
°
C
Indoor Fan Speed
Compressor
Electric Heater(Option)
ON
ON
OFF ON OFF
OFF OFF ON OFF
OFF
Hot
Start
minimum
10sec.
minimum
10sec.
minimum
10sec.
minimum
10sec.
OFF
A A
OFF LOW LOW
Setting Temp. +1
°
C
(Compressor OFF)
Selecting
fan speed
Selecting
fan speed
• A point: The indoor pipe temperature to be less then 35°C & Discharge air Temperature to be less than 32°C.
The indoor fan operates for minimum 10sec. even if falls lower than 37°C.
Low( V ) Stop( VI )
43˚C
Discharge Air Temp.
Indoor Pipe Temp.
37˚C
28˚C
26˚C
Selecting Fan Speed( IV )
Low(
II
) Stop(
I
)
(Hot-Start Operating)
Heating Start
(Hot-Start Release Point)
Selecting Fan Speed(
III
)
During heating operation, the operating procedure of the indoor fan is as the following.
Step Indoor fan speed Pipe temp. Air discharge temp.
Off 28 C(Hot start operating) -
Low 28 C
<
43 C
Selecting speed 28 C 43 C
Selecting speed 28 C > 37 C
Low 26 C 37 C
Off 26 C -