Page 1 of 1

Help wiring fan & limit control

Posted: Tue Jan 31, 2012 11:12 pm
by joe123
Can I get some help wiring the limit and fan control.


Old one.

*.us/photo/my-images/94 ... 000160.jpg

New one, Honeywell L4064

*.us/photo/my-images/71 ... 100164.jpg

- Help wiring fan & limit control

Posted: Wed Feb 01, 2012 4:22 pm
by Freon
You need to find the wiring schematic on the furnace, possibly on the back of the blower cover or furnace cover.

You have 2 connections to determine. First is simple the motor connection. The 2nd connection is the high limit safety and I do not know how your old furnace fan control handles that. I see 2 wires from your photo going behind the control box. The Honeywell control has many ways to wire their control once you know how your old control handles high limit safety.

- Help wiring fan & limit control

Posted: Wed Feb 01, 2012 4:34 pm
by joe123
Just want clarification, before I start stripping wires lol.


*.us/photo/my-images/70 ... 00165.jpg/

*.us/photo/my-images/60 ... 00166.jpg/

- Help wiring fan & limit control

Posted: Thu Feb 02, 2012 2:14 am
by how
Red line is the power line which attaches to either bottom connection on your new fan/limit control.
Blue wire goes to the upper connection marked fan.
Brown wire that drops down goes to the upper connection marked limit.
Short brown limit wire is discarded with the old control.
Leave the new fan/limit jumper in place.