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Zones are the number of areas that you want to control independently of each other. If two rooms can be controlled together, they can be one zone; if they need to be controlled separately, they should be separate zones.
Amperage, or amps, refers to the amount of electricity flowing through the wires.
Voltage, or volts, is a measurement of the difference between two electric fields (in heating terms, the difference between the Earth's electrical field and the electricity running through your wires).
Taco Switching Relays combine clearly-labeled PC board layouts with advanced features that allow you to completely customize your system. And whether you're using basic priority switching, Taco Plug-In PowerPort Cards or add-on power controls, tailoring the system has never been easier. External indicator lights give you instant diagnostic feedback, making service calls or new installation start-ups a snap. All switching relays are UL listed, use standard "ice cube" replaceable relays and are compatible with conventional and programmable thermostats. For larger jobs, switching relays can be expanded up to 20 zones with priority. With the exclusive Taco PowerPort Plug-In Cards, you can easily add such features as post purge, priority protection and pump exercise. Any expandable switching relay can also interface with the Boiler Reset Control and Injection Mixing Add-On Power Controls. Mix-and-match as needed to customize the system. Features include:External Indicator LightsSwitchable PrioritySimplified WiringFully Enclosed Snap-Out RelaysCompact DesignFuse Protected100% Factory TestedIsolated End SwitchContractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL and CSA Approved24 Volt Power Input or Output TerminalExtended 3 Year WarrantyMade in the USA
(based on 63 reviews)
of respondents would recommend this to a friend.
Reviewed by 63 customers
Displaying reviews 1-10
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from Central WI
Comments about 4 Zone Switching Relay:
i'm controling my boiler and 4 in floor heating zones easy hookup works efortlesly
Bottom Line Yes, I would recommend this to a friend
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(1 of 2 customers found this review helpful)
It works great.
from Scarsdale, NY
Comments about 1 Zone Switching Relay:
Replace the old relay and more reliable.
from willow springs il.
was easy to hook up easy to use! shipping took along time. (3) days before they shipped...............
The proper hookup for my system and thermostat were not included in the instructions, but once I used my meter to figure out how the relay worked, I got it up and running and it works great. I used a 519 One Stage thermostat and the instructions for that and the relay made no sense, so I had to figure it out on my own, but not that big of a problem to do so. Everything works great now.
I am perfectly satisfied with Pex
from superior, WI
I have been updating my 30 year old boiler and have relied on Pex for controllers, pumps and s soon to br purchasef exhaust fan snd other shelf items. I appreciate the quick turn-around on my order and the quality/price. I would highly recommend Pex Supply to anyone.
from holyoke, ma
Great product and great price. Shipped fast and got the products in only a few days. Thanks!
If app. is a 24 Vac source only - Beware
By DIY Brad
from Mid-coast Maine
I was using this unit as a way to tidy up some wiring while providing a 24 Vac source for a controller. If zone 1 is not being used, you MUST remove the jumper powering the zone1 area of the board or the unit will not provide reliable 24 Vac upon power loss & recovery. (An unusual use of the unit, but support was unaware of this issue.)
A reliable product
from Reno, NV
The Taco SR501 has and is a very reliable product. I have utilized this product on hydronic systems for fan coils and single zone use for the past 15 years. No issues have been encountered todate with this product.
(0 of 1 customers found this review helpful)
Good and reliable
from New City, NY
I like this switching relay instead of the ARGO or Honeywell models because of the LED indicators. Customers like to see visual status of system operation.
Works well, does what it says it will do
from Bisbee, AZ
I bought the single zone relay so the setup was pretty easy, having never done one of these before. It works well with my Taco hydronic heating pump and Nest thermostat. I used the simple on/off with the default in the off position. Interesting that you can use the normal closed position as the default, so something is always running until you trigger it. I don't have a use for that, but it could be a very useful in some situations. It was a bit bigger than I thought it would be, but the transformer, and switches seem to be sized for the long-term.
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