B&Q Airforce aircon IR codes

[andrew@xxxxxxxxxxxxxxxxxxxx (Andrew Gabriel)]

I have worked out the IR codes for the Airforce air conditioners B&Q
have been selling this year, in case anyone's interested. Mine is a
12,000/hr BTU model, but this remote does other models too (as it
includes features my aircon doesn't have). However, I don't know
exactly which other models it will work with -- probably at least
the 9,000 BTU model which looks identical.

I'm afraid I'll have to give you the raw encoding details, as I
don't use any of the standard IR encoders/decoders, but something
more homebrew. Someone else will have to convert it to one of the
standard formats.

Modulation from 33kHz to 41kHz seems to work, with values in the
middle of the range giving best results (max distance and angle of
operation).

Preamble consists of 9112µs of carrier, followed by a 4373µs gap.
35 data bits are then sent.
A trailer of 761µs carrier is sent.
There does not appear to be any form of checksum.

Each data bit is encoded as 761µs of carrier followed by a gap.
For a zero bit, the gap is 395µs.
For a one bit, the gap is 1552µs.

The 35 data bits are as follows. Bit 1 is sent first.
For the multi-bit values, the LSB is sent first.

Bit	Bits	Function
1	3	Mode:	0=Auto 1=Cool 2=Dehumidify 3=Fan-only 4=Heat
4	1	Power:	0=off 1=On
5	2	Fan:	0=Auto 1=low 2=medium 3=high
7	1	Swing:	0=off 1=On
8	1	Sleep:	0=off 1=On
9	4	Temperature: 0=16C 1=17C 2=18C ... 12=28C 13=29C 14=30C
13	1	Timer units 0.5
14	1	Timer tens BCD 1
15	1	Timer tens BCD 2
16	1	Timer:	0=off 1=On
17	1	Timer units BCD 1
18	1	Timer units BCD 2
19	1	Timer units BCD 4
20	1	Timer units BCD 8
21	1	*Humidifier: 0=off 1=On
22	1	Lights:	0=off 1=On
23	1	*Anion: 0=off 1=On
24	1	*Save
25	1	*Air 1
26	1	*Air 2
27	9	value=148 (magic to identify Airforce air conditioner)

*These features are ignored by the 12,000 BTU/hr model.

Example data bit encodings:

Mode=heating, Fan=auto, Sweep, Temp=21, Indicator Lights:
00110010101000000000010000001010010

Mode=cooling, Fan=high, Temp=23, Indicator Lights:
10010100111000000000010000001010010

Switch off (only bit 4 matters):
00000000000000000000010000001010010

Hope this info is useful to someone.

--
Andrew Gabriel