4 Zone Switching Relay w/ Priority Zoom
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4 Zone Switching Relay w/ Priority

SKU:SR504-EXP-4

Brand: Taco

Taco
Qty Price
$188.95
/ each
$365.70 / box (2 units x $182.85)
In Stock! Ships in 24-48 Hours
(72 Available)
3

Specs

Zones:
?
4
Width (Inches): 10-1/4"
Height (Inches): 6.75
Depth (Inches): 2-3/4"
Amperage:
?
20
Power Control Plugs: 1
Application: Zoning
Power Method: 120 VAC Input
Voltage:
?
120 VAC

Description for Taco SR504-EXP-4

Taco Switching Relays combine clearly-labeled PC board layouts with advanced features that allow you to completely customize your system. 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. 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 Lights
  • Switchable Priority
  • Simplified Wiring
  • Fully Enclosed Snap-Out Relays
  • Compact Design
  • Fuse Protected
  • 100% Factory Tested
  • Isolated End Switch
  • Contractor Friendly PC Board Layout
  • Universal Thermostat Compatibility
  • UL and CSA Approved24 Volt Power Input or Output Terminal
  • Extended 3 Year Warranty
  • Made in the USA

4 Zone Switching Relay w/ Priority

REVIEW SNAPSHOT®

by PowerReviews
Taco4 Zone Switching Relay w/ Priority
 
4.8

(based on 11 reviews)

Ratings Distribution

  • 5 Stars

     

    (9)

  • 4 Stars

     

    (2)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Reviewed by 11 customers

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Displaying reviews 1-10

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(1 of 1 customers found this review helpful)

 
5.0

I was looking for simplicty with future

By T

from Newport, RI

Verified Buyer

Comments about 6 Zone Switching Relay w/Priority & 3 Powerports:

I needed four relays and had very little space. I also wanted to have room for two extra zones for an unbuilt addition. Taco had the perfect solution with this six relay expandable unit

(0 of 1 customers found this review helpful)

 
5.0

Great buy

By DCM

from North Adams MA

Verified Reviewer

Comments about 4 Zone Switching Relay w/ Priority:

Easy hook up... less mess and clutter of wires.. Works as intended!

 
5.0

I would buy this product again.

By Motorman

from West Branch MI

Verified Buyer

Comments about 6 Zone Switching Relay w/Priority & 3 Powerports:

Very dependable and eazy to install.

(0 of 1 customers found this review helpful)

 
5.0

Works great. Solved cold shower problem

By tireguy

from Gloucester, MA

Verified Buyer

Comments about 6 Zone Switching Relay w/Priority & 3 Powerports:

Installed this TACO 6 zone control unit with priority zone to replace five TACO individual controllers. Having the priority zone hooked up to the water heater solved my problem with loosing hot water in the shower if one of the heating zones was getting activated. I've also been able to sell the used controllers to offset the cost of the 6 zone controller. The unit did arrive poorly packaged for shipment though. The relays came out of their sockets during shipment and were bouncing around inside, standoff on the circuit board was broken. The unit works fine though, no problems, just very poorly packaged.

 
5.0

Would buy again

By Whatever

from New York

Verified Buyer

Comments about 6 Zone Switching Relay w/Priority & 3 Powerports:

Very functional relay

(1 of 1 customers found this review helpful)

 
4.0

Seems well made

By tedward

from CO

Verified Buyer

Comments about 6 Zone Switching Relay w/Priority & 3 Powerports:

I used this unit in my radiant heating system and it worked great and seems well made and was easy to hook up. Would recommend this.

(0 of 1 customers found this review helpful)

 
4.0

Great Addition to my Home Heating System

By Kenejr

from Guilford, CT

Verified Buyer

Comments about 4 Zone Switching Relay w/ Priority:

This controller gives me the feeling that my home heating needs are finally being met. My home has never been so comfortable, since I bought it with a Rube Goldberg type two-zone system. Fixed all my issues. The documentation was a little hard to follow...I had to do a lot of additional research to make sure I was wiring things properly.

 
5.0

This panel is great!

By Chuck, heating contractor

from Topeka Kansas

Verified Buyer

Comments about 4 Zone Switching Relay w/ Priority:

Very slick panel. Makes entire installation look more professional. I have used these before but I had a minor problem this time(my mistake in wiring) and called Taco tech support, they really knew their product and got me back on track.

(0 of 1 customers found this review helpful)

 
5.0

easy install

By DIY

from South Dakota

Verified Buyer

Comments about 3 Zone Switching Relay w/Priority & 3 Powerports:

Used on my replacement cold start boiler that had only one pump input on control board. I have two pump controlled zones and wanted to able to add indirect water heater with the 3rd zone priority in the future, so it filled the bill. Also has a lot of expansion capabilities that I probably won't every use, but who knows..

 
5.0

Great Product

By Eliad

from Great Falls, MT

Verified Buyer

Comments about 3 Zone Switching Relay w/Priority & 3 Powerports:

I replaced 3 Honeywell relays with this product. The wiring for this Taco is much simpler and it does have one relay with priority. Very happy with this purchase.

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Q&A: Ask the Questions, share answers

Do you have questions about this product?

get answers from real customers and in-house experts with AnswerBox.

13 Questions | 28 Answers
Displaying questions 1-10Previous | Next »
  • 4 Zone Switching Relay w/Priority & 3 Powerports

    Q:

    I have taco sr504-exp relay currently running 4 zone pumps from thermostats. I also need to run my primary loop pump to cut off and on with my existing 4 zone pumps. Right now i have to run the primary pump constantly even when my 4 zone pumps are not running to supply heat to my heat exchanger for domestic hot water. One solution might be to add a flow switch in my domestic hot water line to activate the primary loop circut but i am not sure how to keep the 4 zones off when heat is not needed to suplly heat to the 4 zones. Right now i am wasting heat because i have to leave the main loop pump on all the time unless i manually shut the switch off. Any idea,s would help Thanks Terry Fouts
    Asked on 9/8/2012 by Terry from Houston Alaska

    5 answers

    • VERIFIED BUYER

      A:

      I do not understand how your setup is. Why don't you make a total of 5 zone
      pumps? This way you can put the water heater on the 5th zone pump. The
      pumps usually have a backflow preventer valve and when they are off you
      should not get hot water through that zone. I am not an expert in the area
      but it seems odd to me to have a main pump and 4 additional zone pumps.
      Perhaps you actually have 4 zone valves not 4 pumps, that would make more
      sense. If that is the case then you will need another zone valve for the
      heater. All the zone valves should have a switch that would trigger the
      pump when the switch is wide open.
      Elad

      Answered on 9/8/2012 by Anonymous
    • VERIFIED BUYER

      A:

      Wire the primary loop pump directly to the terminals on the aquastat. I had
      a similar setup using the Honeywell 8148 aquastat on my boiler and the
      sr504. The aquastat triggered the boiler circulator when the thermostat
      called for heat as well as the sr504 triggering the appropriate zone pump.

      Answered on 9/8/2012 by Anonymous
    • VERIFIED BUYER

      A:

      Doesn't your DHW heat exchanger have an aquastat? That's how I handle it. My
      DHW heat exchanger has priority (by means of an extra relay that I added)
      over the heating zones. If your DHW can be treated as just another zone then
      that's easy. Mine can't, but even with that I'm able to let the aquastat
      handle switching of the main loop pump.

      Answered on 9/8/2012 by Anonymous
    • VERIFIED BUYER

      A:

      One of several options is to pick up an additional SR501 relay and run 18/2
      wire from end switch on SR405 to TT terminal on SR501 that is now powering
      your primary circulator. The cheapest option is to run a hot line to the
      Com circuit on the SR504 and then run a lead from the N/O to the primary
      circulator. Many options, but these are two that come to mind immedialtely.
      <email@powerrevie
      wsemail.com> To
      Sent by: <****@***.***>
      "PowerReviews" cc
      <email@powerrevie
      wsemail.com> Subject
      Can you help a fellow shopper?
      09/08/2012 04:08
      Please respond to
      <reply-fe93167771
      62007875-100997_H
      TML-381803375-106
      4144-2208@powerre
      viewsemail.com>
      "I have taco sr504-exp relay currently running 4 zone pumps from
      thermostats. I also need to run my primary loop pump to cut off
      and on with my existing 4 zone pumps. Right now i have to run the
      primary pump constantly even when my 4 zone pumps are not running
      to supply heat to my heat exchanger for domestic hot water. One
      solution might be to add a flow switch in my domestic hot water
      line to activate the primary loop circut but i am not sure how to
      keep the 4 zones off when heat is not needed to suplly heat to
      the 4 zones. Right now i am wasting heat because i have to leave
      the main loop pump on all the time unless i manually shut the
      switch off. Any idea,s would help Thanks Terry Fouts"
      Can you answer Terry's
      question about this
      product?

      Answered on 9/10/2012 by Anonymous
    • CUSTOMER CARE

      A:

      We would recommend that you install a dedicated circulator for just the domestic hot water loop.

      Answered on 9/27/2012 by PexSupply Staff from NY
  • 3 Zone Switching Relay w/Priority & 3 Powerports

    Q:

    I have this existing relay on my furnace (New) The furnce is 62 years old ( American Standard) and by Fall I will replace with a Buderus G115WS4. I know you recommend the Honeywell but will my existing Taco work?

    Thanks
    Asked on 5/3/2012 by Mike from Westwood, MA

    5 answers

    • VERIFIED BUYER

      A:

      Yes it should
      Sent from my iPhone

      Answered on 5/3/2012 by Another PexSupply Customer
    • VERIFIED BUYER

      A:

      Yes, it will work.

      Answered on 5/3/2012 by Another PexSupply Customer
    • VERIFIED BUYER

      A:

      The Taco pump control relay will work.
      Just be sure to wire the priority zone for the hot water if you are doing
      an indirect.
      Stan

      Answered on 5/3/2012 by Another PexSupply Customer
    • VERIFIED BUYER

      A:

      Most likely it would work fine. This switch have a contact that turns
      on the furnace when needed. Since this switch is a modern technology
      most likely will be compatible with your new furnace.

      Answered on 5/3/2012 by Another PexSupply Customer
    • CUSTOMER CARE

      A:

      This switching relay will work as long as you are zoning by circulator.

      Answered on 5/23/2012 by PexSupply Staff from NY
  • 4 Zone Switching Relay w/Priority & 3 Powerports

    Q:

    what is the best thermostat to use with the Taco 4 zone with four zones to operate
    Asked on 4/17/2012 by Madhatter from Brentwood, CA

    8 answers

    • VERIFIED BUYER

      A:

      If its a straight forward hydronic radiant heat application, I'm using Uponor A3030101 heat-only, two wire thermostats. They're inexpensive and work with the the Uponor actuators in using. I actually bought this and didn't realize it was the 120v version and bought the ZVC406EXPs that use 24v for the actuator side.
      -Jonathan

      Answered on 4/17/2012 by Another PexSupply Customer
    • VERIFIED BUYER

      A:

      Any thermostat will work with the Taco control. Which one to choose depends
      on your application, whether you want programmability, both heat and cool
      control, your budget, etc. If replacing old battery powered tstats make
      sure you have enough conductors in the cable to operate a new line powered
      Tstat properly. You should consult with an electrician or heating contractor
      if unsure.

      Answered on 4/17/2012 by Another PexSupply Customer
    • VERIFIED BUYER

      A:

      Any thermostat will work great with this unit. If you are looking for a
      setpoint controller for a floor sensor or something like that I use the
      Tekmar series on setpoint controllers. If you are just looking for a basic
      thermostat you don't need to spend a lot of money on that, a cheapy from
      Home Depot will work great.

      Answered on 4/17/2012 by Another PexSupply Customer
    • VERIFIED BUYER

      A:

      I have a Taco 4 zone and I am using the Honeywell ForcusPro
      programable thermostat. These suit my purpose. However, if you are
      willing to spend the money there are some pretty fancy thermostats
      available. Some have motion detection and will change the setting
      when someone walks into the room. Others can be set with an app on
      your smart phone.
      Arthur Alexander
      Elkins Park, PA

      Answered on 4/17/2012 by Another PexSupply Customer
    • VERIFIED BUYER

      A:

      I have used the Wirsbo thermostats with good success.

      Answered on 4/17/2012 by Another PexSupply Customer
    • VERIFIED BUYER

      A:

      Any

      Answered on 4/18/2012 by Another PexSupply Customer
    • VERIFIED BUYER

      A:

      Any thermostat will work (digital or dial).
      Sent from my iPhone

      Answered on 4/18/2012 by Another PexSupply Customer
    • CUSTOMER CARE

      A:

      Taco switching relays work with any low-voltage thermostats, so you have plenty of options. You need to decide whether you want programmability, a digital display, cooling capability, etc.

      Answered on 4/19/2012 by PexSupply Staff from NY
  • 3 Zone Switching Relay w/Priority & 3 Powerports

    Q:

    I need a switch for my wood boiler system. I have two zones controlled by zone valves and a Grundfos Alpha pump, and I have a domestic water heater with a circulator. Will this switch take care of both or do I need two seperate switches? If yes, which ones? Thank you.
    Asked on 12/7/2011 by Henrik from Huntingdon PA

    1 answer

    • CUSTOMER CARE

      A:

      You would need two separate controls. We would recommend a ZVC403-2 for the zone valves (no two-zone ZVC is available) and a SR502-2 for the circulators (with the DHW circulator given priority). You can tie the end switch on the zone valve control into the thermostat terminal on the switching relay.

      Answered on 12/7/2011 by PexSupply Staff from NY
  • 1 Zone Switching Relay w/Priority & 3 Powerports

    Q:

    What type of wire should I be using to wire up the expansion ports between a SR503-Exp and an SR501-EXP?
    Asked on 12/4/2011 by CoreyZ from Richmondville, NY

    1 answer

    • A:

      To wire the expansion ports on the 1 Taco Zone Switching Relay w/Priority & 3 Powerports you can use any 18 AWG wire, with up to four connectors.

      Answered on 12/8/2011 by Anonymous from None
  • 3 Zone Switching Relay w/Priority & 3 Powerports

    Q:

    can i use this to control a wood fired boiler? it would have 2 heating zones and 1 heat dump zone controled by aquastat for when 2 heat zones are not calling for heat I will use a seperate pump to each of the 3 zones. thank you
    Asked on 10/15/2011 by klem from Coudersport, Pa

    1 answer

    • CUSTOMER CARE

      A:

      Yes, this control will work if you are using zone pumps.

      Answered on 10/18/2011 by PexSupply Staff from NY
  • 6 Zone Switching Relay w/Priority & 3 Powerports

    Q:

    I am planning to install a system with 6 zones and a circulator on each zone. Will this unit be able to supply 120 V to each circulator?
    Asked on 9/30/2011 by Dane from Prince George, BC

    1 answer

    • CUSTOMER CARE

      A:

      Yes, it will.

      Answered on 10/4/2011 by PexSupply Staff from NY
  • 6 Zone Switching Relay w/Priority & 3 Powerports

    Q:

    hi, I would like to purchase the taco SR506 to replace my 503 to increase my ability to add more zones. I printed out the wiring diagrams for the SR506 and I'm not sure how to duplicate how the jumpers would be like they are on my 503. The 503 has a jumper that goes from P-ZC-H-X1. X2 goes to the aqustat which goes to the power vent For the boiler. My boiler is a Biasi cold start. Your help would be appreciated. Thanks
    Asked on 6/11/2011 by Anonymous from Carmel,Maine

    1 answer

    • CUSTOMER CARE

      A:

      The SR506 has a switch inside of it instead of a jump. The switch acts like the jumper in the 503.

      Answered on 6/13/2011 by PexSupply Staff from NY
  • 4 Zone Switching Relay w/Priority & 3 Powerports

    Q:

    i want to run the thermostats and circ. pumps independant of the boiler, the biomass boiler is completly controlled by the internal water temp will the unit handel this application
    Asked on 1/24/2011 by ian from berne ny

    1 answer

    • CUSTOMER CARE

      A:

      Yes, you will not hook the switching relay's end switch to anything.

      Answered on 1/31/2011 by PexSupply Staff from NY
  • 4 Zone Switching Relay w/Priority & 3 Powerports

    Q:

    I currently have a SR503 switching relay and am adding 4 more zones. I would like to buy a SR504-EXP so I can add a reset controller later on but am woundering if I can use the expandable as my master and use the current sr503 as the slave but am not sure how to wire it or if its possible?
    Asked on 12/19/2010 by Chad from Sheboygan, WI

    1 answer

    • CUSTOMER CARE

      A:

      You cannot do what you are describing, as you can only connect EXP's to EXP's.

      Answered on 1/5/2011 by PexSupply Staff from NY
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