BACnet/Modbus Translator point-- MODEHVAC

[dngrsone]

I am interfacing Alerton's Envision for BACtalk with a couple Carrier return air units, and the Carrier rep gave me an analog read-only point called MODEHVAC.

Does anyone know what I can expect to see out of this point and what the numbers mean?

[dngrsone]

Well, someone provided me with a list for the 48/50 series Carrier RTU, which is one of the ones I'm working with:


0 Startup
1 Disabled
2 Shutting Down
3 Softstart Request
4 Rem. Sw. Disabled
5 Fan Status Fail
6 Static Pressure Fail
7 Comp. Stuck On
8 Off
9 Test
10 Tempering Vent
11 Tempering Lo Cool
12 Tempering Hi Cool
13 Vent
14 Low Cool
15 High Cool
16 Low Heat
17 High Heat
18 Unoc. Free Cool
19 Fire Shut Down
20 Pressurization
21 Evacuation
22 Smoke Purge
23 Dehumidification
24 Reheat


Now, if I do a little programming in the BCM DDC, I can have a bunch of alarms in my EBT displays (since I can't program an alarm graphic only if an AV point is a specific value). :rolleyes:

[lonman]

Hi,

It looks from this enumeration list that this Carrier output is sort of intended to provide something similiar to combination of SNVT_hvac_status and maybe SNVT_hvac_mode. It looks like to map this to the LonMark world a type translator would do this for you.

Regards

[dngrsone]

Added #6-- Static Pressure Fail