Add Dewpoint/Condensation/Frost control on OmniStat or controllers please!

lupinglade

Senior Member
There is a major lacking in the functionality of either the OmniStat or the HAI controllers: There is no way to easily avoid winter condensation on cold windows in the winter!

I use the code below but it is not very good because there is a lack of granularity and adjustment. The code should probably be in the OmniStat too. Look at how Honeywell does it, they do the calculations within the thermostat but let the user set a Frost Protection setting value from 1 - 10 (or 8?) which affects how much protection there is (ie. how much the Maximum Humidity is lowered when the outdoor temperature drops).

So many places in the world need this frost protection! Can HAI add this to the OmniStat?

The other way I can see this being done is by adding some arithmetic support to the controller's programming that way we can write custom code to do this.

Also there needs to be a way to adjust the RH calibration on the OmniStat, because sometimes the thermostat is located in a non-ideal location that isn't very representative of the humidity of the rest of the home. Being able to alter it slightly would make the OmniStat much more flexible. This is especially important because the OmniStat doesn't support external humidity sensors.

CODE:

66. EVERY 15 MINUTES
AND IF AC POWER ON
THEN RUN Auto Balance Climate Settings
67. // Winter Humidity Condensation Control
68. WHEN Auto Balance Climate Settings
AND IF Outdoor Temperature CURRENT READING IS GREATER THAN 10
THEN ALL THERMOSTATS HUMIDIFY SETPOINT 40
THEN ALL THERMOSTATS DEHUMIDIFY SETPOINT 50
69. WHEN Auto Balance Climate Settings
AND IF Outdoor Temperature CURRENT READING IS LESS THAN 10
AND IF Outdoor Temperature CURRENT READING IS GREATER THAN -10
THEN ALL THERMOSTATS HUMIDIFY SETPOINT 40
THEN ALL THERMOSTATS DEHUMIDIFY SETPOINT 40
70. WHEN Auto Balance Climate Settings
AND IF Outdoor Temperature CURRENT READING IS LESS THAN -10
AND IF Outdoor Temperature CURRENT READING IS GREATER THAN -15
THEN ALL THERMOSTATS HUMIDIFY SETPOINT 37
THEN ALL THERMOSTATS DEHUMIDIFY SETPOINT 37
71. WHEN Auto Balance Climate Settings
AND IF Outdoor Temperature CURRENT READING IS LESS THAN -15
AND IF Outdoor Temperature CURRENT READING IS GREATER THAN -20
THEN ALL THERMOSTATS HUMIDIFY SETPOINT 35
THEN ALL THERMOSTATS DEHUMIDIFY SETPOINT 35
72. WHEN Auto Balance Climate Settings
AND IF Outdoor Temperature CURRENT READING IS LESS THAN -20
AND IF Outdoor Temperature CURRENT READING IS GREATER THAN -25
THEN ALL THERMOSTATS HUMIDIFY SETPOINT 30
THEN ALL THERMOSTATS DEHUMIDIFY SETPOINT 30
73. WHEN Auto Balance Climate Settings
AND IF Outdoor Temperature CURRENT READING IS LESS THAN -25
THEN ALL THERMOSTATS HUMIDIFY SETPOINT 27
THEN ALL THERMOSTATS DEHUMIDIFY SETPOINT 27
 
bumping this up as i'd really like to hear something back regarding this from HAI members here. I find it upsetting that basic thermostats seem to have this functionality but my home automation enabled communicating thermostat can't do this?
 
lupinglade,
You are correct that the Omnistat2 does not have an automatic frost protection to prevent your windows from frosting up. This is a feature we will evaluate to potentially incorporate in future firmware releases.

Thanks,
Ryan
 
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