Adding Taco ZVC404


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Old 02-05-23, 08:25 AM
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Adding Taco ZVC404

WM GTO-4 boiler with L7224U a'stat.
3 zones (Honeywell V8043's) + IDHW
All seems to work fine...but since I can never leave well enough alone, I'm thinking about adding a ZVC404...essentially for 2 reasons:
1. Having the IDHW on 'priority' seems like a groovy idea
2. The wiring from the 3 ZV's goes into an insane rat's nest that drives my OCD absolutely nuts
(and 3... I really like blinky flashy LEDs)

Anyway - the wiring / installation looks pretty straight-forward - but I do have one quick question:

- On the ZVC404...does the ISOLATED END SWITCH go to the TT terminals on the L7224?

The diagram says "To boiler aquastat relay TT"...which I think is the TT terminals on the L7224...but I wanted to ask, just to be sure.

Thanx in advance! Wally
 
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Old 02-05-23, 08:35 AM
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Mods - just realized I may have put this in the wrong forum (didn't see the 'boiler' section.
Please feel free to relocate it if necessary.

Thanx!!
 
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Old 02-05-23, 10:53 AM
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Thread moved.

It's all about the flashy lights.
To the boiler TT takes the place of terminals 2 and 3 on the Taco valves.
 
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Old 02-05-23, 11:17 AM
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Hey PJ!! Long time, no....uhhhh...whatever.

Not sure I follow...? Taco valves? My ZV's are Honeywell.

What am I missing?

Wally
 
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Old 02-05-23, 01:56 PM
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Same thing.... uses the red wires from the Honeywell valves.
The red wires go to the controller along with the yellow wires.
The TT output replaces the red wires.
 
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Old 02-06-23, 06:41 AM
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Thanx PJ! The thermostats and ZV's are easy peasy.

But my question is specifically regarding the ISOLATED END SWITCH (basically the main end switch on the ZVC404). Take a peek at this: https://s3.amazonaws.com/s3.supplyho...structions.pdf

...along the top - left of the thermostat terminals.

Pretty sure it goes to the TT term on the aquastat (so the boiler can 'do it's thang.'

Thanx!
Wally
 

Last edited by Wally107; 02-06-23 at 07:47 AM.
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Old 02-06-23, 08:12 AM
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You are correct!
 
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Old 02-06-23, 08:38 AM
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Thanx rbeck!! One of those "I-know-the-answer-but-better-ask-since-I-ain't-a Pro" things.

Even tho I'm not a Pro - I'm pretty handy, and comfortable doing this...not much to it.

Thanx again!
Wally
 
 

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