21V51U-843 Furnace Controller

hvac1000July 23, 2011

I down loaded the instructions for the subject controller off the web. I have three questions for anyone that is familar with the controller.

1. What does it mean when they say "No Signal", "Positive Half Wave", "Negative Half Wave,and "Full Wave" when thay are discussing switch settings for motor optimization??

2. What does it mean when they associate S4-1 & S4-2 with "Delay" ??

3. What does it mean when they associate S3-3 & S3-4 with "Adjust" ??

Thanks in advance

Sign Up to comment
More Discussions
Baseboard heater thermostats
We are looking to install (2) 120v baseboard heaters...
2 Stage vs 1 Stage
I am trying to decide what HVAC replacement system...
New Furnace - Keep Previous Excellent Thermostat?
I am replacing a 20-year-old single-stage Carrier gas...
What in the world is this thing? (Water furnace) And I need a new one?
Hi. So my new condo has an ancient thing I've been...
Greenspeed, is this setup ideal/ worth it?
I am building up on my house (cape style) in Long Island...
© 2015 Houzz Inc. Houzz® The new way to design your home™