cab heather connection


The old and reliable.

Freshly Restored
Freshly Restored

Posts: 243

Joined: Sun Jan 10, 2016 7:56 pm

Location: Edmonton, Alberta

Post Mon Dec 05, 2016 8:44 pm

Re: cab heather connection

OK, this past weekend I dug out my spare heater to check, I was sure mine had 4 wires.

I rebuilt the electric motor in this one just over a year ago when I put the heater together from leftover parts of several other heaters. The motor is an original.

I assume you are talking about the barn-door style heater:
Image

I took it apart again to get to the motor:
Image

The motor is made by Redmond, it seems to have markings on it '10Z4' and 'SH96'.
I previously took the motor completely apart to clean & lubricate it, and replaced the old leads with modern wire, as the old cloth covered wires were falling apart. I extended the ground lead longer than the original so I could move the ground location to something better than on the heater frame
Image

There are 4 (four) wires coming out of the motor (red, yellow, green, black)

green and yellow are connected to the windings in the motor
green = ground
yellow = power
as well, red & black go to the brushes in the motor. In addition to the green & yellow connections,
to go one direction, red=power and black=ground
to go other direction, red=ground and black=power

Technically, it is really a single speed reversible motor, the way they get 2 speeds out of it is by using the little toaster element/resistor wire on the back of the heater switch. full speed setting doesn't run the power through the resistor, slow speed does.
Image

hope this clarifies things
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Golden Jubilee
Golden Jubilee

Posts: 4833

Joined: Thu Nov 29, 2012 11:47 am

Location: Bothell, Washington

Post Tue Dec 06, 2016 1:41 pm

Re: cab heather connection

^^^^great post^^^^ nice job on restoration!
Gentle Men! you can't fight in here! This is the war room!

Yard Art
Yard Art

Posts: 73

Joined: Wed Jun 15, 2016 8:59 am

Post Tue Dec 06, 2016 2:22 pm

Re: cab heather connection

Kyoung, do you recall what the bearings were when you lubricated the motor? Brass, babbitt or ball bearings? My fan is hitting the lower part of the housing shroud. Thinking brass and is worn.

Freshly Restored
Freshly Restored

Posts: 243

Joined: Sun Jan 10, 2016 7:56 pm

Location: Edmonton, Alberta

Post Tue Dec 06, 2016 8:51 pm

Re: cab heather connection

hi

the motor had brass or bronze bushings, I just cleaned them and used a small drop or two of sewing machine oil, and tested the shaft spins freely.

I doubt that it is worn bushings in the motor causing your problem. You could check though by taking out the motor and seeing if there is any play up/down or side to side on the shaft, and run the motor while it is out to see if it sounds ok.

What is likely your problem is the same issue I had.

In the frame the motor is mounted by only 2 bolts, on rubber washers. since the bolt locations are left/right of each other when the heater is mounted and not above/below each other, the rubber washers let it have some play, and the motor could sag down a bit to where the blades rub against the opening. It's a pain to adjust it properly. You cant just tighten up the 2 motor mounting bolts too much, otherwise it pulls the front half of the motor housing too tightly and it binds, and the shaft cant turn at all.

Image

To fix it permanently, I just added a couple clear silicone adhesive bumpers (see picture for location). They are the same kind you use on the back of picture frames. They keep the motor from flexing side to side and therefore the blades hitting the side of the opening. When unit is assembled you cant see them, and they are pressed under the back face of the motor so no chance of them falling out.

Image


One other thing to check is how far along the motor shaft the fan cage is mounted, if too far out the blades my be too close to the face of the heater core, too far down and the fan cage may be rubbing something else. Adjust it if needed with the little setscrew. Also check for bent fan blades, they are pretty soft.

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Pile of Parts

Posts: 49

Joined: Fri Nov 11, 2016 11:50 am

Post Wed Dec 07, 2016 8:35 am

Re: cab heather connection

thank's Ksever mine is exactly like picture,,and i hope it is original.. thank'S again

Yard Art
Yard Art

Posts: 73

Joined: Wed Jun 15, 2016 8:59 am

Post Wed Dec 07, 2016 8:58 am

Re: cab heather connection

@ kyoung, that may be my problem as well. The bladed fan is rubbing on the bottom of the opening. It doesn't feel like the fan is loose on the shaft or there is any play in the bearing. So hoping it's just the rubber mounts. Yeah, the blades do bend easily. Great detailed info.

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Pile of Parts

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Post Fri Jan 20, 2017 12:09 pm

Re: cab heather connection

welcome.. at the end of the job, we found how to connect the motor, it is a ccw and a cw rotation, and we have to connect a (black) wire to + and white and green together or (white) on + and black and green together and you have the other rotations, i do not know why is like that but, i try both connection and only difference is ccw, no heat to cab and air flow to windshied, on cw hest in cab and air flow to windshield.
and i say :it the same blower as pic shown before.
thank's lot
Marcel

Pile of Parts
Pile of Parts

Posts: 49

Joined: Fri Nov 11, 2016 11:50 am

Post Mon Sep 02, 2019 6:46 am

Re: cab heather connection

thanks to all of you.I have installed a two-action switch to turn the motor in both directions, still to install and make the tests.
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