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david sweet

david sweet

Joined on December 18, 2003

Last Post on November 29, 2013

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Recent Posts

Taco zone valve control transformer question

@ November 29, 2013 11:35 AM in Taco zone valve control transformer question

The Taco zone valve control (ZVC) has internal transformer(s), so any external transformers are not required and can be removed.

So now enjoy the long weekend…

XPB uses 008's

@ August 19, 2013 5:51 AM in Taco x-Pump block, cartridge swapping

The Taco X-Pump Block (XPB) uses 2 @ 008 circulators; one variable speed and one fixed speed. Usually the variable speed circulator is used for injection as temperature control and fixed speed is used for system. The XPB is designed for 008 circulators and cannot be substituted for a different model. If more capacity is needed than 2 can be piped in parallel.

Votlage Surge

@ July 16, 2013 8:56 AM in Taco ZVC404-EXP Problems

Hi Mark,
It sounds like a voltage surge caused this erratic operation, and probably due to lighting strike from a summer thunder storm. I would replace both units because they have been exposed to this surge and further problems may arise. A whole house surge suppressor may be a good investment…
Taco has come out with a newer version of the ZVC404-EXP in the past few years. It now has a composite cover and lights in the front, time delays including priority protection as well some other enhancements. They wire similar, but the communications between zone controls are now 3 wire and not interchangeable between new and older versions. Although they can be connected together following the diagram on page 49 of the new “Taco Zone Controls Wiring Guide” #100-92. 
Here is the link to the wiring guide on our website: [u][size=12][color=#0000ff][/color][/size][/u]
[size=12][color=#000000] [/color][/size]
[size=12]Thanks Again,[/size]
[size=12]Dave Sweet[/size]
[size=12]Taco, Inc.[/size]
[size=12]1160 Cranston Street[/size]
[size=12]Cranston, RI 02920[/size]
[size=12]401-942-8000 Ex 282[/size]
[size=12] [/size]

Taco X-Pump block, larger HX

@ July 2, 2013 3:26 PM in Taco X-Pump block, larger HX availibility

The X-Pump Block (XPB) has a replaceable heat exchanger; unfortunately it has a custom mounting configuration and is not substitutable with a generic heat exchanger.  The XPB comes with a 3” X 8” - 14 plate heat exchanger capable of transferring 60,000 BTU’s at a 20 degrees Delta T.
I hope this helps you…    

Dave Sweet @ Taco

Zone Controls

@ December 18, 2003 9:23 AM in Circulating Pump Switching Relays

Taco makes full line of hydronic zone controls. Switching relays for zoning with circulators, zone valve controls for valve zoning and hydro-air fan controls for air handlers. With the addition of outdoor reset controls that plug directly into the zone panels make for a simple but complete temperature and zoning solution. Taco also offers a complete wiring guide for their zone controls. Contact your local heating wholesaler or our website ( for more information. Thanks

Light Commercial Primary Secondary Controls

@ July 28, 2003 4:24 PM in Controls

Eric, I would use a staging control that integrates outdoor reset on any multi boiler installation. It not only saves energy, but rotates the boilers for equal run time. This also helps with the domestic hot water heating, where one boiler may satisfy the load instead of both. The primary pump can be connected to one of the end switches of a zone control. The boiler pumps are connected to their respective boiler operating controls. The staging control will enable the boiler operating controls. Any other questions let me know. Dave