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HVAC humidifier duct dumper

  • Last Updated:
  • Jul 14th, 2021 3:21 pm
[OP]
Deal Addict
Aug 19, 2006
1985 posts
353 upvotes
Mississauga

HVAC humidifier duct dumper

I have this duct dumper on the HVAC humidifier that is labeled to close in the summer and open in the winter.
Should I actually be doing this ? The humidifier get quite cold when the AC is running.
Wouldn't turning humidistat to 'off' position turn off the humidifier ? why close the dumper then ?
On a side note, how can I verify if this humidifier is actually working ? I tried to play around with humidistat in the winter and didn't notice any difference.
Thanks

https://ibb.co/SRHRtTV
2 replies
Deal Addict
Oct 19, 2020
1048 posts
668 upvotes
GTA
It's important to close that damper in the summer to prevent cold supply air from being dumped right back into the return.

If water flows when the heat is on and the humidistat is set above humidity level, it is working.
It can take hours or days to notice a difference in humidity level if you turn it on when the house is very dry - building materials take up humidity like a sponge.

Maintenance is important. The pad should be checked once a year and replaced when it is very scaled up.
Every year, check the drain line for blockages and clean the drain tray.
Some say to just change the pad every year, but they tend to last longer than that in flow-through models because most of the minerals get flushed down the drain.
Hvac advice warning - inaccurate information on forum, vested interests in selling builder's equipment. Selling dealer-only brands without being authorized is a red flag. Report to CRA if offered no tax cash-deal. If it's 2 good to b tru, it is.
Deal Addict
Jun 16, 2009
3788 posts
2327 upvotes
Woodbridge
If you happen to close the damper in summer, DO NOT FOEGET to reopen in winter. Many people tend to forget it defeating the purpose of having the humidifier.
krypton wrote: I have this duct dumper on the HVAC humidifier that is labeled to close in the summer and open in the winter.
Should I actually be doing this ? The humidifier get quite cold when the AC is running.
Wouldn't turning humidistat to 'off' position turn off the humidifier ? why close the dumper then ?
On a side note, how can I verify if this humidifier is actually working ? I tried to play around with humidistat in the winter and didn't notice any difference.
Thanks

https://ibb.co/SRHRtTV
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