Please Help! Wiring ZTS-100 Thermostat

Other Devices & Integrations Climate Control & Temperature Sensors
1

I am hoping that somebody might be able to provide some help in wiring a ZTS-100 Thermostat

The controller I am replacing is a BM2-24-HZ:
[url=http://nationalairparts.com.au/sites/default/files/imagecache/Scale-h450/actron—general-purpose-bm2-24h-gp-24-hour.jpg]http://nationalairparts.com.au/sites/default/files/imagecache/Scale-h450/actron---general-purpose-bm2-24h-gp-24-hour.jpg[/url]

It is wired (with only 3 wires) as shown in the next pic:
[url=http://farm3.staticflickr.com/2892/10052031014_e2e7ace921.jpg]http://farm3.staticflickr.com/2892/10052031014_e2e7ace921.jpg[/url]

and the wiring diagram for the ZTS-100 is:
[url=http://farm8.staticflickr.com/7445/10052300494_ed999327ba_o.jpg]http://farm8.staticflickr.com/7445/10052300494_ed999327ba_o.jpg[/url]

the jumper diagram is:
[url=http://farm8.staticflickr.com/7350/10052347625_12412deb4c.jpg]http://farm8.staticflickr.com/7350/10052347625_12412deb4c.jpg[/url]

Is this compatible? And if so to which terminals would I connect the 3 wires? Any help would be much appreciated!

2

What you are showing us via the existing wiring is for the existing controller config. You can’t wire the new one with that comparison diagram. You’ll need to look at the existing wiring coming from the furnace/ac unit (or heatpump You don’t mention what it is) . With that info we (i) can help with the wiring more. One thing I will say is that with Zwave you will need to have a AC (24v) line coming to the T-stat or it won’t work correctly (has been my experience). Because Zwave wants to talk regularly with the Vera or whatever controller you are using for polling and status. On mine I use both the Zwave plugin and the RFwave plugin for Wifi tstat connections.

And to just get you started. With a quick 3 wire connection you will have heat, cooling and fan. You would still need a power line too. 4 wires minimum depending on configuration of your furnace of course.

Steve

3

Usually the minimal wiring (US) is:

  1. Red - 24 V Power
  2. White - Heat (Minimum for Heat Only)
  3. Yellow - Cool
  4. Green - Fan (Minimum for Forced Air Heat/AC, Can also be used with Heat pump Single Stage)
    +1 - 2nd Stage Cooling
    +1 - 2nd Stage Heat and/or Aux Heat
    +1 - 3rd Stage Heat and/or Aux Heat
    +1 - 24 V Common (Needed for All Z-Wave/Wifi Thermostats or any other thermostat that uses to much power to run on Battery only)

A three wire setup is very non standard.

Some battery devices will leach the power from Red White wires. When the thermostate is open (Not calling for heat) … there is often 24 volts across these terminals. The thermostat can use this power … as long as it does not use enough current to engage the gas valve.

4

Steve, Richard

Thanks very much for the responses!

I must have incorrectly assumed that I could just replace the existing controller with the new z-wave thermostat :frowning: I’m in Australia and not sure whether the wiring is standard here. The place was built about 10 years ago.

This is what it looks like behind the controller:
[url=http://farm8.staticflickr.com/7431/10055953883_5631e3a7b3_o.jpg]http://farm8.staticflickr.com/7431/10055953883_5631e3a7b3_o.jpg[/url]

There is what looks like a thermostat in another room:
[url=http://farm6.staticflickr.com/5504/10055767563_691b2bf229_o.jpg]http://farm6.staticflickr.com/5504/10055767563_691b2bf229_o.jpg[/url]

It will be an electric powered AC/Heater system, which must be installed in the ceiling of the bathroom as there is a cover and some noise from there when the heating is on
[url=http://farm4.staticflickr.com/3753/10055805956_07e81b7400_o.jpg]http://farm4.staticflickr.com/3753/10055805956_07e81b7400_o.jpg[/url]

Going to have to get some ladders and get up there and take off the cover :slight_smile:

5

I don’t suppose this helps?

[url=http://farm4.staticflickr.com/3827/10126882186_fa134726a1_b.jpg]http://farm4.staticflickr.com/3827/10126882186_fa134726a1_b.jpg[/url]

[url=http://farm4.staticflickr.com/3723/10126885176_133818e1c5_b.jpg]http://farm4.staticflickr.com/3723/10126885176_133818e1c5_b.jpg[/url]

6

Doubt you’ll be able to use standard thermostat wiring for that setup.

What you are showing is bus that powers the tstat on the wall with a data link back to the AC/Heat unit. Then you also show a remote temp sensor in that other 2 wire configuration. And no those other pictures at the furnace are of no value.

You won’t be able to put a standard thermostat in place. You will be forced to use whatever the vendor offers you if you have to replace that setup.

Steve