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+--- Thread: VAV logic (/showthread.php?tid=6031)
VAV logic - Haug1 - 20.06.2025
Hi.
I need some help to make this script:
Fist i need a ga/ input that chenges between summer and winter mode.
I have 4 g/a with cooling command 0-100%.
I need to make a sum based on of the cooling modes are activ. The cooling is activ if the avlue is more than 0 (1-100)
This sum is the setpoint of the ventilation system that i need to send to on g/a
Summertime:
If not activ:
cooling cmd 1: 250
cooling cmd 2: 390
cooling cmd 3: 500
cooling cmd 4: 180
If activ:
cooling cmd 1: 250
cooling cmd 2: 650
cooling cmd 3: 850
cooling cmd 4: 250
Wintertime:
If not activ:
cooling cmd 1: 250
cooling cmd 2: 250
cooling cmd 3: 250
cooling cmd 4: 120
If activ:
cooling cmd 1: 250
cooling cmd 2: 250
cooling cmd 3: 250
cooling cmd 4: 120
I Also need a new g/a output ff the colling command is not 0 (1-100) to controll some vav dampers
summer time i want the following:
cooling cmd 1: if 0 =0%, if 1-100 =100%
cooling cmd 2: if 0 =35%, if 1-100 =100%
cooling cmd 3: if 0 =42%, if 1-100 =100%
cooling cmd 4: if 0 =46%, if 1-100 =100%
in winter time i want the following:
cooling cmd 1: if 0 =0%, if 1-100 =0%
cooling cmd 2: if 0 =0%, if 1-100 =0%
cooling cmd 3: if 0 =0%, if 1-100 =0%
cooling cmd 4: if 0 =0%, if 1-100 =0%
RE: VAV logic - admin - 20.06.2025
Provide some examples how the final value is calculated. Two commands have the same output value for both active and inactive states.
To what value is 70% applied?
RE: VAV logic - Haug1 - 21.06.2025
I have 8 VAV dampers (2 per floor) that are controlled using a 0–100% command, corresponding to vMin–vMax.
Currently, some of the VAV dampers have the same vMin and vMax values, but this may change later.
When there is a cooling command, the corresponding VAV damper should switch to vMax = 100% in summer mode.
When this change to vMax occurs, I also need to increase the setpoint of the ventilation system accordingly.
Example – Setpoint Airflow Calculation:
Cooling Command Status Value
Cooling Cmd 1 Not active 250
Cooling Cmd 2 Active 650
Cooling Cmd 3 Active 850
Cooling Cmd 4 Not active 180
Resulting ventilation system setpoint = 1930
The 70% that i first decribe i see was wrong. I have change that part now i the main topic.
RE: VAV logic - admin - 25.06.2025
Add a common tag to all cooling cmd input group addresses and summer/winter group address. Attach an event script to this tag. Modify group addresses, value presets and setpoints as needed.
Code:
value = grp.getvalue('0/0/1')
mode = value and 'summer' or 'winter'
items = {
{
input = '0/0/21', -- command value
output = '0/0/22', -- damper control
summer = {
on_value = 100,
off_value = 35,
on_setpoint = 650,
off_setpoint = 390,
},
winter = {
on_value = 70,
off_value = 0,
on_setpoint = 450,
off_setpoint = 250,
},
},
{
input = '0/0/23', -- command value
output = '0/0/24', -- damper control
summer = {
on_value = 100,
off_value = 35,
on_setpoint = 650,
off_setpoint = 390,
},
winter = {
on_value = 70,
off_value = 0,
on_setpoint = 450,
off_setpoint = 250,
},
},
{
input = '0/0/25', -- command value
output = '0/0/26', -- damper control
summer = {
on_value = 100,
off_value = 35,
on_setpoint = 650,
off_setpoint = 390,
},
winter = {
on_value = 70,
off_value = 0,
on_setpoint = 450,
off_setpoint = 250,
},
},
{
input = '0/0/27', -- command value
output = '0/0/28', -- damper control
summer = {
on_value = 100,
off_value = 35,
on_setpoint = 650,
off_setpoint = 390,
},
winter = {
on_value = 70,
off_value = 0,
on_setpoint = 450,
off_setpoint = 250,
},
},
}
setpoint = 0
for _, item in ipairs(items) do
conf = item[ mode ]
value = grp.getvalue(item.input)
key = toboolean(value) and 'on' or 'off'
grp.checkwrite(item.output, conf[key .. '_value'])
setpoint = setpoint + conf[key .. '_setpoint']
end
grp.checkupdate('0/0/3', setpoint)