Adding A Fourth, Lower Speed To Fan - HVAC - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC


Thread Tools Display Modes
Old 05-27-2012, 01:19 PM   #1
Join Date: May 2012
Posts: 3
Rewards Points: 12

Adding a Fourth, Lower Speed to Fan

My window-mounted, evaporative cooler has a three speed, permanent
split capacitor (PSC) motor. A guy at a Home Depot review site for this cooler said he "added a fourth speed--1/3 of the lowest speed." He did not explain, and there is no email address to write him. Can anyone say how to do this?

Alternatively, what do people think of the following solution, using a dimmer?

Set the switch to "High." Disconnect wires from the low and medium speed terminals.

Cut the lead supplying power to the motor.

Add variable control in series. Use one of the dimmers that is variable from electrical supply stores. The dimmer must be a "triac" and not an "SCR." SCR's work great with resistive loads but not with inductive unless certain conditions are met.

Speed may now be varied down to about 20% of the motor's rated speed.


ElleNavorski is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Broan variable speed motor m0t0rgeo Electrical 1 09-22-2011 01:58 PM
Electrical Problem w/ New AC Blower Motors - High Speed shuts off after 15 Min? Tyndale Electrical 6 07-10-2011 03:58 AM
Is there a way to have heat, cool and fan all on same blower speed? pirateo HVAC 4 08-14-2009 04:13 PM
Trane XV80 - low speed fan not working oregondean HVAC 4 01-12-2009 12:46 PM
Heat Pump blower speed? ktkelly HVAC 1 07-18-2007 10:01 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1