Datasheet
LTX-VCI Datasheet
LTX-VCI Iss1.05
RealTime Control Systems Ltd. Park House, Greenhill Crescent, Watford WD18 8PH. Tel 01923 233384 Fax 01923 233385 Page 6
Web:
www.realtime-controls.co.uk
, E-mail:
support@realtime-controls.co.uk
LTX-VCI Datasheet Issue 1.05.01 12/07/2003 Doc No. 92101
Operation Notes
Master/Slave Operation
Some Daikin A/C units operate in AUTO with separate heating and cooling setpoints. The
readback values of run-mode and setpoint reflect the actual values the unit is operating to
rather than those initially set by the BMS or keypad. With the LTX Master/Slave operation the
LTX controllers copy the read-back data from the keypad master and write it into the slave
units. If the master unit is operating in AUTO with an initial setpoint of 20 degrees then when it
moves into heating mode the readback data will be 18 degrees, HEAT, and the slave units will
be placed in this state. Hence the slave units will mirror the operation of the master as
expected and will perform the same setpoint transitions as the master even though they will
not be operating in AUTO. It is recommended that the system designer should check that this
functionality is acceptable.
Fault Mapping
The following mapping provides a list of the Daikin fault codes that are reported individually
and the corresponding single byte codes that the VCI generates for these codes. In some
control systems the VCI code will be visible and manual translation will have to performed, in
others the supervisor software can be used to automatically map the VCI code to the original
Daikin fault code so the native codes can be presented. Future versions of LTX controllers will
allow the original codes to be reported directly.
LTX-VCI Code
Decimal Hex
Daikin Fault Code
21 15 A0
22 16 A1
23 17 A3
24 18 A6
25 19 A7
26 1A A9
27 1B AF
28 1C AJ
29 1D C4
30 1E C5
31 1F C9
32 20 CJ
33 21 E0
34 22 E1
35 23 E3
36 24 E4
37 25 E9
38 26 F3
39 27 H9
40 28 J3
41 29 J5
42 2A J6
43 2B JA
44 2C JC
45 2D JH
LTX-VCI Code
Decimal Hex
Daikin Fault Code
46 2E L4
47 2F L5
48 30 L8
49 31 L9
50 32 LC
51 33 P1
52 34 P4
53 35 U0
54 36 U1
55 37 U2
56 38 U4
57 39 U5
58 3A U7
59 3B U8
60 3C U9
61 3D UA
62 3E UC
63 3F UF
64 40 UH
101 65 Unknown Fault Code
111 6F AC Non-Existance
112 70 AC Comms Error
153 99 LTX Query Fail
255 FF No fault