Can the two transformers be hooked in parallel to service a 500 W zone?

Can't say it is correct but a 40 va transformer (which is most common) should be just fine. Why did he not use the existing hot wire for the old tstat?

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When you wire the transformers you need to make sure the power for both transformers are coming off the same leg of power from the main panel box. If you don't you will burn one or both out.

They do sell kits that you can buy to parallel wire both transformers. You can also power both transformers from one furnace. Do a search on youtube and you should be able to see how it's done.

I suggest contacting the manufacturer as there may be an internal "reconnect" that would allow 220v operation. Good luck!

When you place the transformer in series you will be affecting the voltage on the output, placing them in parallel with give you the same voltage, but will increase the amperage output. Both transformers MUST be Identical. A switch must be used on the line side to disconnect Both simultaneously, for safety reasons.

All Manor House low volt transformers are 12 volts AC only :-(

Since the Pyle speaker is a 4 ohm device, it's likely that when you have other zones on, the change in the impedance will affect the volume. Check to see what impedance your other speakers are (standard is usually 8 ohm), and if your tuner has impedance matching for your zones. If it does not, that's most likely your issue. You could get an impedance matching transformer at Radio Shack to resolve this issue. Please rate my solution, thanks.

what size speakers and what watts, how many channels on the amp, you could do it in either way
There are two ways to wire electrical components. In parallel or in series. Both are important to understand, especially when properly hooking up speakers to amplifiers.
Parallel wiring is connecting components to a source so that they share the same voltage. To put that in a useful way, it would be connecting all of the speaker positive terminals to the positive terminal of the amplifier and connecting all of the speaker negative terminals to the negative terminal of the amplifier.
Series wiring is connecting components to a source so that they share the same current. To put that in a useful way, it would be connecting the amplifier's positive terminal to the positive terminal of the first speaker and then connecting the negative terminal of the first speaker to the positive terminal of the second speaker and so on. The final speaker in the chain will have it's negative terminal connected to the negative terminal of the amplifier. Hope it Works

if its cutting off and right back on then check your ground and your power wire makes sure both are connected good and none of your fuse's are blown, either that or you got a wire hooked up backwards in the sub.. but my guess is that the sub is hooked up wrong... that sub should be hooked up in a series or in parallel,

ok if your running just one speaker, it should be hooked up like this and 2 speakers are a different way...

this is parallel :pos to pos , neg to neg, then one wire coming from pos on sub to pos on amp then neg on sub to neg on amp but bridge the amp on your amp should be 2 pos and 2 neg in two different channels take the pos off the sub into the pos on 1 channel and then the neg from sub to the neg on the other channel,

this is series : on the sub it will go pos to neg then the other neg and pos will go to the amp, but make sure the pos and neg r on different sides of the sub, dont hook them both to the same coil

if your need more help give me your email and ill send you a pic of how to do it...

You can connect them in a series/parallel configuration. Put two of them in series and then connect the last one in parallel across the two in series. This would give you an impeadance of around 2.7 ohms. Only do this if your amp is stable at 3 ohms or less. I am not familiar with the specs of your amp. If your amp is only 4 ohm stable you can not do this.
This would also give you half the power on the two subs in series as the power for the one that is parallel. The two in series would be sharing the total output signal, where-as the one in parallel would get the entire output signal from the amp.
if you were to connect a fourth sub woofer in this configuration it could give you a 4 ohm load, by adding the fourth sub in series with the single sub that is in parallel. or in other words, yu have two sets of 2 sub woofers each in series. That gives you two 8 ohm loads (two 4 ohm subs in series is 8 ohms). Then you take the two sets of subs and parallel them (two 8 ohm loads in parallel equals 4 ohms).

If i had a picture to show you it would make sense, two subs in series that are in parallel with two subs in series.

there is a "zone a lone" switch on the upper right side of the panel. Make sure it is in the "occupied" position. I believe that is up. If that doesn't work reply back.