HELP WITH...Electrical relay connect to minisplit Air conditioner

Old 10-08-17, 06:37 PM
Thread Starter
Join Date: Oct 2017
Location: DC
Posts: 1
Upvotes: 0
Received 0 Upvotes on 0 Posts
Smile HELP WITH...Electrical relay connect to minisplit Air conditioner

I have a 3 ton (36,000 BTU) Minisplit for my 800 Square foot Garage.

I'm self employed and use my garage often for work.

I'm having a hard time keeping the humidity levels around 50% in my garage

I understand the Minisplit,when running under COOL mode, will act as a dehumidifier. . When my humidifier is on and the A.C. turns on -both fight each other. And this process continues over and over..yiu can see where this is going!

I would like to set up some type of On/Off relay.

When the A.C. is triggered to come on. it Turns the humidifier off. And When the Cooling is off and only the indoor Air Handler is On the Humidifier turns on

​​​​​​any help at all would be great.
Old 10-09-17, 06:07 PM
Tolyn Ironhand's Avatar
Group Moderator
Join Date: Nov 2007
Location: United States
Posts: 14,086
Received 782 Upvotes on 662 Posts
If you are using your A/C, you should not be running a humidifier at all. It is counter productive.
Old 10-11-17, 05:39 AM
airman.1994's Avatar
Join Date: Dec 2005
Location: VA
Posts: 5,491
Upvotes: 0
Received 8 Upvotes on 8 Posts
If you need to keep the humidity at a certain percentage for your work you will need something more in the lines of a liebert unit. They are designed to do this.
Old 10-28-17, 07:57 PM
user 10's Avatar
Join Date: Mar 2004
Location: NA
Posts: 1,809
Received 55 Upvotes on 49 Posts
On your mini-split, keep the fan speed at the highest setting -> this reduces dehumidification and shifts capacity to actual cooling.

Assuming it has a variable capacity compressor - if there's a way to lock your mini-split on high cooling and have the fan continue to run with no call for cooling, do it.

This will shorten cycles and any moisture removed during each short cycle will re-evaporate into the air.
Old 10-29-17, 05:03 AM
GregH's Avatar
Super Moderator
Join Date: Jan 2001
Location: Manitoba
Posts: 9,498
Received 67 Upvotes on 61 Posts
What allows the Liebert branded unit to dehumidify is the fact that in addition to a variable speed fan there are electric heating elements in the unit to add heat to prevent over cooling when de-humidification is needed.
This might be a bit too costly for home use.

One thing that would cause the humidity to be higher is if the AC unit were oversized.
A relay that energized another ac unit when the mini split runs would likely achieve what you want or you could operate an electric heater to keep the AC unit running longer.
Old 10-29-17, 10:25 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 63,093
Received 3,607 Upvotes on 3,234 Posts
I think the OP was just passing thru. He hasn't been back in a while.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: