How does a taco zone valve work - Application: Taco Zone Sentry Zone Valves can be used in a wide vari- ety of heating and (non condensing) cooling applications, primarily designed for use with baseboard, fan …

 
to the zone valve controls. When the thermostat calls for heat, both the appropriate zone valve and yellow indicator lights are energized. When the zone valve is fully opened, the end switch relay and red indicator light is then energized. Zone Valve Controls Taco Zone Valve Controls work with two-, three-, or four-wire zone valves. Fully fuse. Matthew weiss tmz

Taco Zone Valve Controls work with two-, three-, or four-wire zone valves. All are fuse protected; it also includes two isolated end switches and a built-in priority switch. The contractor friendly PC board layout eliminates incorrect wiring and the "unfinished" look of conventional zone valve installations.Taco ZVC404-4 is a 24 VAC powered, compact zone valve control device that provides numerous features and capabilities for managing zone valves and circulator pumps in HVAC systems. It offers advanced functionality, including priority zone protection, external diagnostic indicators, and compatibility with various zone valve types.Danfoss pumps are found working in industries that include marine and offshore products, commercial and residential buildings, mobile hydraulics and even water and wastewater manag...I have hot gas/water baseboards for heating, 2 zones, and Taco valves. Heating for zone 1 does not work properly. Seems that during the day it's not heating at all and zone1 temp is around 63F even if I set the thermostat to 69 or 70. At night the temp in zone 1 is about 68. outside it's actually colder (24F) so I don't know what's going on.(007-F5-F1FC) 007 Cast Iron Circulator with Integral Flow Check 1/25 HPThe Taco 007-F5-7IFC, cast iron Circulator Pump is a key component in many hydronic he...Taco Zone Valves and Thermostats, the system’s performance and dependability is maximized. ©Taco Catalog #100-5.1 Effective Date: 07/11/07 Supersedes: 04/15/04 Printed in USA ... Zone Valve Controls Taco Zone Valve Controls work with two-, three-, or four-wire zone valves. Fully fuse protected,24 vac zone valves priority xx zone 3 priority off cc con 2 wire zone valve (no end switch) must use jumper taco 3 wire zone valve 1 2 3 jumper 3 & 4 taco 3 wire zone valve 1 2 multi-zone installation with zone control, with indirect dhw one zone switching relay with outdoor reset sr 501-or-4 led indicators power tstat dhw override boiler relay ...The taco zone valve is explained, taken apart, voltage read, terminal wiring explained and shown in action with water in the top of the pipe falling through ... Work with 2-, 3- or 4-Wire Zone Valves. We’ve enhanced our complete line of Zone Valve Controls with the features and styling you’ve been asking for. Whether you’re looking for switching relays, zone valve controls, priority zoning circulators, or fan controls, Taco has everything you need. Together with Taco Zone Valve Controls ... Precise, Cost-Effective Temperature Control for Your Heating Systems. Taco iSeries ® Mixing Valves provide precise and cost-effective temperature control for your heating systems, the flexibility of zone-to-zone control, plus built-in protection against boiler flue gas condensation. Available in 2-way, 3-way or 4-way injection configurations ... The 5000 Lead-Free Series ASSE 1017 certification allows for domestic hot water storage at temperatures high enough to increase the effective storage capacity of a water heater, kill harmful bacteria and still be delivered at a safe 120°F or less. The valve’s unique design and advanced thermostatic element ensures a stable mixed water ...ZVC405 5 Zone 120 VAC Input 80 VA 113⁄4" 71⁄2" 3". All Zone Valve Controls are relay type DPDT and have a single phase motor rating per zone of 1⁄6 hp (5A) @ 120 VAC. The Taco Connection: Combine the reliability of the Taco Zone Valves, Priority Zoning Circulators, Thermostats, and the “00” family of circulators with the advanced ...The system has a NTI Trinity boiler and 3 zones using Taco 571-2 zone valves connected to a Taco 4 zone control module. 3 of these failures were the power head. The small plastic 'switch lifter' melted loose and allowed the heater to run continiously till it burnt out. The other was a cracked bellows on the valve stem allowing water to leak.Taco 561-5 - 3/4" Sweat 3-Way Zone Valve- 560 Series Heat Motor Zone Valves offer a 3-way bypass version of the Taco 570 Gold Series. Use valves in this series to control the flow to a fan coil or terminal heating unit.The taco zone valve is normally closed. If you have 24 v at 2 and 3 than the valve is open due to s call for heat. Keeping the zone valves all the same makes wiring much easier. The wiring diagram that came with the Honeywell valve will help.A short video explaining how to manually open a zone valveAre you a fan of Mexican-inspired fast food? Do you have a passion for customer service and a desire to work in the food industry? If your answer is yes, then applying at Taco Bell...3/4 in. Zone Valve. 86. (23) Questions & Answers (9) Hover Image to Zoom. $ 154 74. Pay $129.74 after $25 OFF your total qualifying purchase upon opening a new card. Apply for a Home Depot Consumer Card. Made from corrosion- and rust-resistant brass.•Problem:Digital thermostats do not work cor-rectly when connectedto a zone valve control. •Solution: Some thermostats are a “Power Stealing” type which means they are powered by the zone control with just 2 wires (R& W). A resistor may be needed in order to have the ther-mostat work properly. This resistor should be Taco Geothermal Heat Motor Zone Valves are designed for high-head, open-system zone control. The unique end switch design permits control of the heat pump by the valve, allowing cold water into the coil before the heat pump starts. Engineered for reliability, Geothermal Heat Motor Zone Valves provide a time proven method for system zoning and ... Since there's a common circulator pump and controls one might naturally suspect either the zone valve itself ( a bad connection, loose wire), or a bad control module in the Taco master zone control. Take a look at the system temperatures and at whether or not you are using domestic hot water when this short-on-zone problem is occurring. Jan 28, 2023 ... Google will tell you to pay a technician to do it. Well, here I am... for FREE. Nest Power Connector: https://amzn.to/3hy1l2P NOTE: A ...Danfoss pumps are found working in industries that include marine and offshore products, commercial and residential buildings, mobile hydraulics and even water and wastewater manag...for heat, the yellow LED will come on indicating power to the zone valve. This indicates the thermostat is working correctly. When the zone valve fully opens and its end switch makes contact, the red LED will come on, the boiler turns on and a circulator will start if con-nected to the zone control. For information on Taco’s Zone Valve ControlsWe are experiencing our zone valves heating up quite hot to the touch. We're attempting to operate six sparco 525 motorized zone valves w/ end switches from a "H.P.S.' systems pump/circuit board panel w/ the 24 volt auxillary output provided within the panel. The transformer provided is rated 40 watts (va). At this time we don't even have the ...Precise, Cost-Effective Temperature Control for Your Heating Systems. Taco iSeries ® Mixing Valves provide precise and cost-effective temperature control for your heating systems, the flexibility of zone-to-zone control, plus built-in protection against boiler flue gas condensation. Available in 2-way, 3-way or 4-way injection configurations ...About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...Use a Model 569 Taco Transformer or other make rated at 115/24V-40VA. One transformer can accommodate a maximum of 3 Taco-Zone Valves. MANUAL OPENING LEVER For gravity circulation thru valve, push lever in Power Head all the way down. Push back up to restore to automatic operation. Lever moves easily when valve is open. ResistanceZone 1 and hot water work fine. Zone 2 is stuck in open position (Honeywell 8043f, lever has no resistance). Zone 2 only (and always) provides heat if hot water or zone 1 is requesting heat. However, if Zone 2's thermostat is requesting heat, the circulator and furnace do not come on. This is a one circulator system.Hot water heating systems are a popular choice for keeping our homes warm and comfortable. These systems work by distributing hot water through a network of pipes and radiators, pr...Reduced Pressure Zone (RPZ) valve is another name for a backflow device, according to Ravinia Plumbing. Plumbers install RPZ valves in pipes to protect drinking water and municipal...You'll use that for your commons. (a 75VA transformer will do just fine to power both stats.) You'll need 2 24V coil, spst relays. Parallel to the valves, you'll connect the relay coil. The transformer relay kit for the motor will then connect to both relay contacts in parallel. (using the wires that used to go to the thermostat.)Download this manual. SUPERSEDES: November 1, 2009. Plant ID# 001-3944. Application: Taco Zone Sentry Zone Valves provide on-off, normally. open or normally closed control in both open and closed. hot or chilled water systems. The valves can be used in a. wide variety of heating and cooling applications, pri-.Isolate the valve from the water supply. Unscrew the Union Nuts and remove the Valve Body from the system. Using a screw driver, pry the Cover from the valve. Secure the valve Body (using the flats on the body) and unscrew the brass Cap to remove the internals of the valve. From the outlet port, push the Spring and the Piston assembly out of ... The Taco 3 Way Zone Valve piping diagram illustrates the arrangement of pipes and valves required for the system to function. It shows how the valve is connected to the boiler, pumps, and different heating zones. The diagram includes the location of the supply and return pipes, as well as the connections to the various heating zones. PRODUCT NUMBER INPUT MAXIMUM TYPE 1 ENCLOSURE NUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH SR506-4 6 with Priority 120/60/1 VAC 20 amps 121/4" 8" 3". All circulator relay connections, including ZC/ZR, are rated 1/3hp (6 FLA, 36 LRA) at 120 VAC. End switch connections are rated 24 VAC, 1 amp.If part of your house or apartment has no heat most likely you have a bad zone valve. We will replace and troubleshoot a taco zone valve head. Zone valves ar... The QuickTop Zone Valves ® provide on-off, normally closed control in closed hydronic systems. The valves can be used in a wide variety of heating and cooling applications. Use with baseboard, fan coils, radiators, convectors, air handlers, heat pumps and radiant applications. Taco QuickTop Zone Valves ® provide a convenient way to create ... Download this manual. SUPERSEDES: November 1, 2009. Plant ID# 001-3944. Application: Taco Zone Sentry Zone Valves provide on-off, normally. open or normally closed control in both open and closed. hot or chilled water systems. The valves can be used in a. wide variety of heating and cooling applications, pri-.The QuickTop Zone Valves ® provide on-off, normally closed control in closed hydronic systems. The valves can be used in a wide variety of heating and cooling applications. Use with baseboard, fan coils, radiators, convectors, air handlers, heat pumps and radiant applications. Taco QuickTop Zone Valves ® provide a convenient way to create ...Apr 8, 2016 · The taco zone valve is explained, taken apart, voltage read, terminal wiring explained and shown in action with water in the top of the pipe falling through ... How To Wire a System Circulator to a Zone Valve Control (ZVC) from Taco, Inc.PRODUCT NUMBER INPUT MAXIMUM TYPE 1 ENCLOSURE NUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH SR506-4 6 with Priority 120/60/1 VAC 20 amps 121/4" 8" 3". All circulator relay connections, including ZC/ZR, are rated 1/3hp (6 FLA, 36 LRA) at 120 VAC. End switch connections are rated 24 VAC, 1 amp.How a Taco Zone Valve Works. A Taco zone valve has three wiring terminals arranged in a vertical column on the head. The top terminal receives 24-volt power from the system transformer — via the thermostat — and the middle one is a common terminal that serves as a return path to complete the circuit to the transformer. If part of your house or apartment has no heat most likely you have a bad zone valve. We will replace and troubleshoot a taco zone valve head. Zone valves ar... Some background: I have a forced hot water system with five zones. One of the zones wasn't working and I had to debug the system without having much knowledg...From vehicles to industrial tools, there are many products that use pneumatic systems. This means the system takes compressed air and uses it to control energy as it moves through ...We are experiencing our zone valves heating up quite hot to the touch. We're attempting to operate six sparco 525 motorized zone valves w/ end switches from a "H.P.S.' systems pump/circuit board panel w/ the 24 volt auxillary output provided within the panel. The transformer provided is rated 40 watts (va). At this time we don't even have the ...You can also use Flo-Chek in systems with multiple circulator zones to allow heat to flow only into the zones that are calling for heat. In addition, the thumb screw can be opened manually for gravity feed applications, if the main circulator stops operating. 125 PSI maximum operating pressure (862 kPa) and 277° F maximum operating temperature ...A short video explaining how to manually open a zone valveSome background: I have a forced hot water system with five zones. One of the zones wasn't working and I had to debug the system without having much knowledg...Zone Valve Control: Transformer and relay in one box, which allows a low voltage thermostat to control a low voltage zone valve, with an isolated end switch that can energize the boiler and/or circulators. Page 104 TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.When Zone1 Thermostat is ON then Zone1 manual Valve goes up just a quarter of the way if I pull it. *Another time I tested Zone1 with Thermostat ON Voltage was 19.4V-21.1V. Note: When Zone2 Thermostat ON then Zone1 2&3 showing 0 volt. Tested this twice. Thermostat for Zone1- tested wall wires = 24.5V.Checking Function: To determine if a zone valve is working properly, check to see if the valve opens and closes in response to thermostat signals. If the valve does not open or close, it may be a sign that maintenance or repair is needed. Lifespan of Zone Valves: Zone valves typically last between 10-15 years, depending on usage and …3 wire t-stat to 571 zone valve.pdf 11.2K. 0. Geosman Member Posts: 26. ... A better choice would be to replace the 555 with a TACO Zone Sentry zone valve and save yourself the aggravation. ... for just those occasions when a call comes from a DIY customer who installed a new smart thermostat and finds that it does not work. 0. Paul_69 Member ...Oops, it's broken. Here is why. The manual doesn't say how it works, it just gives a simple warning to disconnect power and wait for two minutes before remov...In today’s fast-paced world, finding moments of peace and tranquility can be a challenge. Whether you’re working from home, studying for exams, or simply trying to unwind after a l...The Taco zone valve works by opening or closing the valve based on the temperature needs of each zone, allowing hot water to flow only where it is needed. When installing …Taco Z100P2 is a motorized Zone Sentry series zone valve with 1" copper press connections. Features: Sentry zone valve series is a market leader in efficiency, durability, ease of installation, pressure and flow characteristics. For use in radiant, baseboard, fan coil, heat pump, air handlers and convector applications.Make the switch! The Taco SR501 Switching Relay’s layout makes short work of any job. With its’ compact design and front mounted diagnostic lights; make any installation a snap. Combined with the complete line of Taco zone controls, 00® circulators, thermostats and zone valves, the circuit for simplified installation and service work is ...Built-in Transformer and Relay. The Taco Priority Zoning Circulator combines the reliability of the “00” circulator with the convenience and efficiency of a PC board-mounted switching relay package. Each Priority Zoning Circulator has low and high voltage terminal strips for ease of electrical hookup as well as a built-in priority switch.Taco Comfort Solutions engineers and manufactures high efficiency indoor heating, cooling, and air quality comfort systems. Purchase Taco products at Supplie...Taco 555-050RP - Zone Valve Power Head w/ End Switch (Series 570)- When you want the industry standard for hydronic heating applications, choose Taco's 570 Gold Series. Designers prefer these valves for their quiet and dependable operation. Installers appreciate the open lever and twist-off head that makes installation and service easy.<br><br> Available in 1/2" - 1 1/4" sweat connections.valve p = taco ifc circulator ff = fast fill boiler feed valve pv4 = purge valve recommended purging steps: 1 .close v1, pv4, v2 2 .open v3 3 .open ff valve 4 .open v2, pv4, to purge zone 1 5.close ff valve 6.close v2, pv4 7.repeat steps 1 to 6 for each additional zone 8 .open v1 when all zones are purged 9 .adjust system to desired operating ...Make the switch! The Taco SR501 Switching Relay’s layout makes short work of any job. With its’ compact design and front mounted diagnostic lights; make any installation a snap. Combined with the complete line of Taco zone controls, 00® circulators, thermostats and zone valves, the circuit for simplified installation and service work is ... Taco Zone Sentry®Zone Valves provide on-off, normally open or normally closed control in both open and closed hydronic systems. The Taco Zone Sentry valves can be used in a wide variety of applications, specifically designed for use in heating systems and in chilled water systems where condensation is present. It is pri- The Taco Zone Sentry® is the most technologically advanced zone valve ever made. It’s also simple to install and operate. The valve can be installed in any direction, in any orientation. We then went a step further, allowing the operator to be mounted to the 2-way valve body in either direction, great for those tight baseboard jobs. Snap-in ...So, it bypasses the switch that sends full power to open the valve and gets what it needs, and sends the rest down through the heat coil of that zone valve. This works fine until there is a call for heat and that taco valve opens. When the valve gets near full open, it interrupts current by opening a switch, so the heater coil doesn't overheat.The wiring plan you show above indicates to me that the transformer for the zone valves MAY also operate the gas valve. To do this, A. turn off power to the zone valves. B. Manually open all the valves. C. disconnect the # 1 wire from each valve. D. Disconnect both of the wires that go to the boiler.Globe: Water faucets (taps) are examples of globe valves. When you turn the handle, you screw a valve up or down and this allows pressurized water to flow up through a pipe and out through the spout below. Unlike a gate or sluice, a valve like this can be set to allow more or less fluid through it.Oops, it's broken. Here is why. The manual doesn't say how it works, it just gives a simple warning to disconnect power and wait for two minutes before remov...The zone valve has 2 teminals marked end switch. These 2 wires, and only the 2 marked "end switch" can be taken loose from terminals and tied together to see if the problem is in the motor. After tied together, make sure zone valve is calling for heat. If pump comes on then, bad zone valve operator.So I now have 2 zones, a Taco zone valve controller (zvc-403), and two ecobee thermostats. And I have no idea how to wire it up. I watched a video that showed me how to wire the valve controller. By wiring the circulator to the pump end switch and each of the thermostats to the proper zone and each zone valve to the proper zone on the board.Taco Zone Valve Controls work with two-, three-, or four-wire zone valves. Fully fuse protected, they also include two isolated end switches and built-in priority protection. The contractor friendly PC board layout eliminates the problems caused by incorrect wiring and the “unfinished” look of conventional zone valve installations. The sturdyTaco 555-050RP - Zone Valve Power Head w/ End Switch (Series 570)- When you want the industry standard for hydronic heating applications, choose Taco's 570 Gold Series. Designers prefer these valves for their quiet and dependable operation. Installers appreciate the open lever and twist-off head that makes installation and service easy. > …The wiring diagram for a 3 zone heating system outlines the connections between the thermostat, zone valves, and the boiler or furnace. Each zone of the system has its own thermostat, which communicates with the zone valve to control the flow of heated water or steam to that area. The diagram shows how these components are connected and how ...You'll use that for your commons. (a 75VA transformer will do just fine to power both stats.) You'll need 2 24V coil, spst relays. Parallel to the valves, you'll connect the relay coil. The transformer relay kit for the motor will then connect to both relay contacts in parallel. (using the wires that used to go to the thermostat.)block design of the Taco Heat Motor Zone Valve works. The explanation below and associated diagrams explain step-by-step the operation of the zone valve. As the air … Temperature Range (F): 40°F - 240°F. Max Temp (F): 240°F. +. Taco 571-2 - 3/4" 571 Sweat Zone Valve- Note: Part number/style may vary. Currently the 571-4 is being used in place of the 571-2. The 571-4 provides and fulfills the same operational functions that the 571-2 has; the only difference is a slight difference in the appearance of ... Taco Zone Valve Controls work with two-, three-, or four-wire zone valves. All are fuse protected, it also includes two isolated end switches and a built-in priority switch. The contractor friendly PC board layout eliminates incorrect wiring and the “unfinished” look of conventional zone valve installations. The sturdySR502-4 Switching Relay. Operation:When any thermostat calls for heat, the appropriate circu- lator is energized and the isolated end switch (X and X) will start the boiler. Priority Operation:When zone 2 is switched to the priority setting and is actuated, all other zones will stop operation until zone 2 is sat- isfied.Heart valve surgery is used to repair or replace diseased heart valves. Your surgery may have been done through a large incision (cut) in the middle of your chest, through a smalle...Engineered for reliability, 570 Gold Series Heat Motor Valves provide a time proven method for system zoning and control. The exclusive heat motor design operates silently, while the twist-off head allows for serviceability without disturbing system connections. Available in a variety of sizes and styles to meet the broad demands of today’s ...Call or text 888-757-4774. Taco ZVC404-4 - 4 Zone Valve Control Module with Priority- Taco Zone Valve Controls work with two, three, or four-wire zone valves. Fully fuse protected, they also include two isolated end switches and a built-in priority switch. The contractor friendly PC board layout eliminates the problems caused by incorrect ...Step 5 - Removing the Zone Valve. The zone valve will be bolted onto the pipe. When it's safe to do so, the zone valve can simply be unbolted and removed from the line of pipe. Be careful when doing this because the valve can stay hot for some time, even when the boiler is shut off. Use the screwdriver to remove the electrical connections from ... If part of your house or apartment has no heat most likely you have a bad zone valve. We will replace and troubleshoot a taco zone valve head. Zone valves ar...

The 5000 Lead-Free Series ASSE 1017 certification allows for domestic hot water storage at temperatures high enough to increase the effective storage capacity of a water heater, kill harmful bacteria and still be delivered at a safe 120°F or less. The valve’s unique design and advanced thermostatic element ensures a stable mixed water .... Flight 1372 jetblue

how does a taco zone valve work

Jan 26, 2001 · 5. If the relay does not pull in, the problem is in the relay or the wire to the relay. If you suspect a service problem is caused by a faulty valve, follow these procedures to check its operation: 1. Raise the setpoint of the zone thermostat above room temperature to call for heat. 2. Observe all control devices. The 4th leg splits and has a pair of Taco zone valves. Everything was fine until late spring this year, when part of one stopped heating. Then COVID, turned off everything, and promptly forgot about all if it until this week when I needed to fire up the boiler to keep the kids warm. One of "zone valve" legs isn't running water or getting hot. Honeywell Zone Valve Explained! In this video, we will show how the normally closed Honeywell Zone Valve works. We will also disassemble the new zone valve a...How a Taco Zone Valve Works. A Taco zone valve has three wiring terminals arranged in a vertical column on the head. The top terminal receives 24 …A taco zone valve is an essential component of a heating or cooling system that helps regulate the flow of hot or cold water to specific areas or zones in a building. It operates using a simple but effective mechanism. When the valve receives a signal from the thermostat that a particular zone requires heating or cooling, it opens up to allow ...Taco Zone Valve Controls work with two-, three-, or four-wire zone valves. Fully fuse protected, they also include two isolated end switches and built-in priority protection. The contractor friendly PC board layout eliminates the problems caused by incorrect wiring and the “unfinished” look of conventional zone valve installations. The …Work with 2-, 3- or 4-Wire Zone Valves We’ve enhanced our complete line of Zone Valve Controls with the features and styling you’ve been asking for. Whether you’re looking for switching relays, zone valve controls, priority zoning circulators, or fan controls, Taco has everything you need.The zone valve has 2 teminals marked end switch. These 2 wires, and only the 2 marked "end switch" can be taken loose from terminals and tied together to see if the problem is in the motor. After tied together, make sure zone valve is calling for heat. If pump comes on then, bad zone valve operator.We are experiencing our zone valves heating up quite hot to the touch. We're attempting to operate six sparco 525 motorized zone valves w/ end switches from a "H.P.S.' systems pump/circuit board panel w/ the 24 volt auxillary output provided within the panel. The transformer provided is rated 40 watts (va). At this time we don't even have the ...A check valve , also called a non-return valve, is a mechanical device that normally allows fluid to flow through it in only one direction. The force of upstream fluid creates high...Enjoy this salad at home on Taco Tuesday or any night of the week. Your favorite taco ingredients are deconstructed and served up on a salad. No taco shell needed. Average Rating: ...Taco zone valve leaking waterhttps://www.valuetesters.com https://www.interplaylearning.com for free trial. Use promo code STEVELAV for big limited time disc...Taco ZVC404-4 is a 24 VAC powered, compact zone valve control device that provides numerous features and capabilities for managing zone valves and circulator pumps in HVAC systems. It offers advanced functionality, including priority zone protection, external diagnostic indicators, and compatibility with various zone valve types.Control Valve: The control valve is part of the zone valve assembly and regulates the water flow based on the thermostat’s commands. When the thermostat detects that a zone needs heating, it sends a signal to the valve motor, which opens the valve. This allows hot water to flow into the zone, heating it up.(007-F5-F1FC) 007 Cast Iron Circulator with Integral Flow Check 1/25 HPThe Taco 007-F5-7IFC, cast iron Circulator Pump is a key component in many hydronic he...The taco zone valve is normally closed. If you have 24 v at 2 and 3 than the valve is open due to s call for heat. Keeping the zone valves all the same makes wiring much easier. The wiring diagram that came with the Honeywell valve will help.The 4th leg splits and has a pair of Taco zone valves. Everything was fine until late spring this year, when part of one stopped heating. Then COVID, turned off everything, and promptly forgot about all if it until this week when I needed to fire up the boiler to keep the kids warm. One of "zone valve" legs isn't running water or getting hot.The taco zone valve is explained, taken apart, voltage read, terminal wiring explained and shown in action with water in the top of the pipe falling through ....

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