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MANUALS (3)
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Product Highlights
Description
Performance Data
- Flow Range: 0 v 7.5 GPM
- Head Range: 0 v 15.5 Feet
- Minimum Fluid Temperature: 32?F (0?C)
- Maximum Fluid Temperature: 185¬F (85?C)
- Maximum Working Pressure: 125 psi
- Connection Sizes: 3/4" NPT Female
Features
- All-in-One Heat Exchanger, Dual-sided Circulators and Mixing Control Package
- Brazed Plate Heat Exchanger Provides Complete Isolation Stainless Steel Easily Removable Double Wall Optional
- Only 4 Pipe Connections Required
- Plug-in Low Voltage Connections
- Solid State Microprocessor Design
- Greatly Decreases Installation Time
- Substantial Space Savings
- Line Cord Included, Hard Wire Option
- Bronze Casing for Open or Closed Systems
- Replaceable Cartridge Design
- Maintenance Free, Wet-Rotor Circulators
- 2 Operation Modes: Outdoor Reset and Setpoint with or without Delta T Limiting
- Main System Pump Contact
- 100% Pump Operation / Control Override Switch
- Automatic Pump Exercise
- Adjustable Reset Ratio
- Warm Weather Shutdown
- Large LCD Display
- Outdoor and 2 Strap-on Sensors included
Specs
| Material: | Bronze |
|---|---|
| Amperage: | 2 |
| Application: | Heating |
| Voltage: | 120v |
| Max Pressure (PSI): | 125 |
| Type: | Pump |
| Horse Power: | 1/25 |
| Connection Size: | 3/4" |
| Max Flow (GPM): | 7.5 |
| Flow Range (GPM): | 0-7.5 |
| Head Range (ft.): | 0-15.5 |
| Max Head (Ft): | 15.5 |
| Hertz: | 60 |
| Phase: | 1 |
| RPM: | 3250 |
| Temperature Range (F): | 32°F - 185°F |
| Connection Type: | Threaded |
| Warranty: | 1 Year |
Questions?
3 Replacement Parts
Need help finding a replacement part?
Product Reviews
Most Liked Positive Review
DIY Basement Radiant Heat
Most Liked Negative Review
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Fantastic idea, but doesn't last. flawed by design.
Convenient and reliable for smaller radiant systems
Excellent for Radiant floor Warming with HPWH
Fantastic idea, but doesn't last. flawed by design.
make easy
Solid Problem Solver
Expensive, but works
DIY Basement Radiant Heat
A piece of equipment with many uses
These things are great.
Heating System Pump
Product Q&A
4 QuestionsQ: Do I need a switching relay in addition to my two zone valves with the Taco X Block?
Asked by Northwestern Paul 12 years ago
Add your answer
The X-Block takes a single input signal. If you are using end switches with your zone valves, the end switches may be wired in parallel to serve as the input "closure" signal to activate the X-Block. This means that the zone valves will get their power from an external source that runs the thermostats and valve motors for the zone valves. (The X-block is not intended to provide power for thermostats and zone valves, they must be connected to an external power source.) If you are using TACO zone valves there is a TACO Zone valve control that has a 24 volt transformer for powering two wire thermostats and which will provide output for the zone valves and end switch wiring combining this all into a single output for control of a pump and for bringing on a boiler or heat source. In this instance all you would need to use is the dry contact boiler output typically designated by "T T" to signal the X-Block. Check TACO Zone control model # ZVC403-4 at the following link. http://www.pexsupply.com/Taco-ZVC403-4-3-Zone-Valve-Control-Module-with-Priority This should help with your anticipated installation. The installation diagram with the zone control that is available from this on-line page should help with wiring the control to thermostats, zone valves and for the "T T" contact that will be used to signal the X-Block for operation. (note for start-up, since the X-Block has internal pumps and heat exchangers it is important to assure that the system is well purged of air, so take measures to watch pumps closely on start-up to avoid running them dry / cycle them as needed to clear any air from the system. Programming the X-Block uses Tekmar European program routines, study the manual closely for each step to avoid issues and if necessary contact TACO for assistance if you encounter any problem with setting up the program, particularly if you are using a temperature reset profile to make radiant temperature track outdoor temperature. I hope this advise is helpful.
The x-block has an end switch which closes a contact that could go directly to the boiler control. It probably is going to directly turn on another circulator because the x-block has the two circulators built in. But, either way, the switch in the x-block should not be used to directly switch on a load such as a pump. You need to have a switching relay to power a load.
Q: Is this suitable for domestic water on one pumpside and boiler water on other pump side??
Asked by Steve 13 years ago
Add your answer
Yes, it is a double heat exchanger
We had this installed 3 years ago in our home addition for that very purpose. One side manages our radiant floor heating, the other the water for the bathroom. Seems to be working just fine.
I have two systems in operation with these units. Domestic hot water heater on the supply side and manifold driven radiant loops on the load. The unit integrates with an on demand water heater well as the source. Most radiant systems require hotter water temperatures than the 122-125 degrees normally used for your domestic hot water, so be sure to add a tempering valve down stream of the system on the domestic hot water supply to the house. You'll need to add a check valve to the return of the xp block to prevent the domestic hot water demand from shorting through the xp block. All the Best, Frank Miccoli Alta Bella Casa, Inc.
Steve I used this unit for in floor heating for my garage; boiler one side and separate closed loop in floor on the other . the system worked great . Are you planning on heating the domestic side from the boiler ? Iain
Q: I cannot find anyplace that tells me what all of the symbols at the bottom of the display mean.
Asked by JS 14 years ago
Add your answer
on the taco website
Has to be in the manual. Do not have one in front of me. Thanks, Rob
https://www.taco-hvac.com/en//products.html?current_category=345# Download manuals
Taco supplies great support. You can find the instructions here: http://www.taco-hvac.com/uploads/FileLibrary/102-202.pdf . If you work through the instruction sheet it can be easily deduced. Page 11 explains the functions and shows the corresponding symbol. The common ones you would see is a percentage curve for the mixing pump, signals for supply pump and boiler demand. What displays on the LCD depends upon how you have set the block- i.e. Set point vs outdour reset. Hope this is helpful. You can always contact Taco directly as well.
Attached is the link to Taco-hvac site and the installation manual. Mine has been in for a couple of years and works great. http://www.taco-hvac.com/uploads/FileLibrary/102-202.pdf I hope that helps
I can answer to a limited extent. Best advise is to contact TACO directly. The manual for the X block is very detailed but perhaps unfortunately written by a European Engineer who may presume we know all the "background" information (Tekmar?). There are many sub-routines to each function and no good "road map" to show a novice the steps to access each function. I've had great success with the X blocks but do agree that the display and set-ups required more attention to navigating the display than was anticipated. Some temperature range settings if not used; require scrolling to the upper or lower limit to turn them off and this info is not readily presented in the manual. If you establish the operation conditions you want the X Block to emulate, sensors that are connected and where they are attached, and communicate these to tech services at TACO, I trust they will be able to assist with the correct set-up and interpretation of any fault codes or "!" that may appear in the display. Geosman
Q: Is this a double wall heat exchanger?
Asked by 15 years ago
Add your answer
Verified Reply- PexSupply StaffIt is not. Taco no longer offers the double-wall heat exchanger.