The 4-way can work with the two 3-way switches you have just fine. In fact here is the link for you that shows the connection:
https://www.google.com/search?hl=en&tbm=isch&source=hp&biw=1440&bih=686&ei=it9yWvjABZXGjwOc_4SoCg&q=3+way+to+4+way+switch&oq=3-way+to+4-way+&gs_l=img.1.0.0i30k1.1635.7177.0.9422.17.15.0.2.2.0.115.1138.10j3.13.0....0...1ac.1.64.img..2.15.1151.0..0j0i8i30k1.0.Q4mqL0_2bEs
If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c
SOURCE: REPLACING POWER CORD
White to center, red on Right, Black on left, Green goes to case or external ground screw.
SOURCE: Replace three wire thermostat with four wire thermostat
From the two red and two black wires (and the specs in the pdf), your new thermostat sounds like it's designed to directly control the line voltage (120 or 240) to the heater. That's the usual way baseboard heaters are controlled.
Could your wires be red, black, and (old, yellowed) white, the standard colors in a 3-wire power cable? Just the red and black should be enough to control a 120-volt heater so I don't understand what the white would have been used for. If it were my heater I'd take off the cover(s) -- with the power off, of course -- and find out what those wires actually connect to.
SOURCE: basic wiring for craftman garage door opener
from left to right..
1. red. to wall button
2. white . common to wall button and white wires of sensor.
3. black. white with black strip of sensors
SOURCE: I installed the motion sensor
Leviton manuals:
http://www.leviton.com/OA_HTML/ibeCCtpSctDspRte.jsp?section=17219&minisite=10022
A quick peek inside a sample Leviton manual confirms that your wires are connect correct - BUT...
http://waterheatertimer.org/pdf/Leviton-motion-Instructions.pdf
The remaining 3-way switch needs a jumper wire.
See if your instruction manual shows the same thing as image below.
Let's go through this.
The yellow wire connects to a traveler ... and that traveler connects to one of the brass screws on 3-way switch.
The black wire from Motion sensor also connects to a traveler wire ... BUT you have to identify which traveler wire and which brass screw that traveler wire connects to. And then, put a jumper wire (a short piece of wire) from that brass screw to the dark-colored screw.
I think that will do it.
Add a comment if your device is different.
Some of these electronic devices are reversed when two of their wires are connected together.
That's what the jumper wire is doing. So the 3-way switch is just connecting and disconnecting the black and yellow wires, and that action reverses the circuit in the motion device.
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