how do you wire a zone valve thermostat

How to Wire a Boiler Zone Valve

• Step 1 Turn the boiler power supply off at the main electrical panel. ...
• Step 2 Locate the zone valve DC electrical transformer. ...
• Step 3 Remove the protective cover from the zone valve. ...
• Step 4 Cut two lengths of 18-gauge insulated copper wire using the wire cutting pliers. ...
• Step 5 ...
• Step 6 ...
• Step 7 ...
• Step 8 ...

Full Answer

How does a zone valve switch work on a thermostat?

The second yellow zone valve wire normally connects to the C terminal (Common) on the low voltage transformer. When the thermostat calls for heat it's acting as a low-voltage (24VAC) "on" switch that takes voltage from the low voltage transformer, through the thermostat, to the zone valve actuator motor.

Where does the second thermostat wire connect to?

The second thermostat wire, usually white, connects to the yellow zone valve motor actuator wire. The second yellow zone valve wire normally connects to the C terminal (Common) on the low voltage transformer. When the thermostat calls for heat it's acting as a low-voltage (24VAC)...

How do you wire a zone valve with two wires?

The wire lengths must be able to reach from the thermostat assigned to the zone valve to the valve electrical terminals. Strip 1/2-inch from both ends of each of the 18-gauge wires with wire stripping pliers. Bend open-end loops in each end of the two wires using needle-nose pliers.

What terminal is the common wire on a Honeywell zone valve?

The Common wire, NOT the Load side of the low-voltage transformer is taken to Terminal #2 on the White Rogers and The Common is taken to the Yellow Honeywell zone valve wire. The other yellow wire is common to the thermostat. The correct wiring depends on the zone valve models.

What are the wires on a zone valve?

A 2-port (or Zone valve) has a permanent 230v supply (usually on the grey wire) plus a Neutral and an Earth wire. There is then also a Motor Live wire (usually the brown) and a Switch Live wire (usually the orange).

What are the yellow wires in a zone valve?

At HONEYWELL ZONE VALVE INSTRUCTIONS we describe how the red and yellow wires for a zone valve are usually connected: One yellow wire connects to the C terminal on the low voltage transformer. The second yellow wire connects to a "heat on" wire from the room thermostat.

Do zone valves go on supply or return?

In most installations, the zone valves are in the returns, where the water is cooler. The cooler temperatures are easier on the valves. It has been the practice of some to place them in the supply using a manifold just above the boiler; this is often in conjunction with the “pumping away” concept.

What is the white wire for on a zone valve?

Electrically, the valve has 5 wires: Green/Yellow, Earth - connected to the metal body of the valve. Blue, Neutral - internally connected to the neutral side of the motor. White, Live in 1 - Activates the motor inside the valve to select either AB (both) or A (heating)

What happens if you put a zone valve in backwards?

Zone valves are designed to close gently while opposing the force of the water flow in the pipe. Most are spring loaded. If the valve is installed backwards, the flow of water catches the closure ball, overrides the spring, the valve snaps shut, and the water slams to a halt.

How do you test a zone valve?

0:546:20Heat not working / Zone valve replacement - YouTubeYouTubeStart of suggested clipEnd of suggested clipWe can put our hand on the need the zone valve head and see if it's warm. It should be very very hotMoreWe can put our hand on the need the zone valve head and see if it's warm. It should be very very hot if the water is not flowing through because it's been stopped at the zone valve.

Why is there an override switch on zone valves?

These switches are used to control the circulator pump either directly or through a relay. When you have an overheat condition, the normally open contact will close, turn on the zone valve for the largest zone and the circulator will then run when that zones reporting switch closes. Hope this helps.

What position should zone valve be in?

The zone valve needs to be positioned after the boiler and circulator of the central heating system. They can be located either on the hot side (before the hot water goes into the zone) or on the cold side (after the water goes throughout the building).

How does Honeywell zone valve work?

A thermostat mounted in each desired location controls a specific Honeywell zone valve. When the thermostat calls for heat, the zone valves opens and turns on the water circulating pump to allow water flow to the area. At the same time, the zone valve sends a signal to the boiler and starts the burners.

What is A and B on 3 port valve?

Look at the new three port valve, there is an A and B port, B is for water, Trace pipe to cylinder, to prove it's fitted correctly. Regards. Peter.

How does a 2 port zone valve work?

A 2 port motorised valve has two connections: an inlet and an outlet. When the valve is closed, water cannot flow through it. With the valve to the cylinder coil open and the valve to the radiators closed, hot water from the boiler will flow through the coil.

How many wires does a 2 port motorised valve have?

2 Port Valve Electrically, the valve has 5 wires: Green/Yellow, Earth - connected to the metal body of the valve. Blue, Neutral - internally connected to the neutral side of the motor.

How do you wire a taco zone control valve?

6:2212:23How To Wire a System Circulator to a Taco Zone Valve Control (ZVC)YouTubeStart of suggested clipEnd of suggested clipHere. We are using zone. 3 connect the valve for the zone you're working on wire screw terminals 1 &MoreHere. We are using zone. 3 connect the valve for the zone you're working on wire screw terminals 1 & 2 from the CVC to the 24 volt terminals on the actuator.

How does a zone valve work?

1:0011:02How a Zone Valve Works - Hot Water Heating - YouTubeYouTubeStart of suggested clipEnd of suggested clipHot water flows from the boiler. Through the valve if it's open and circulates around the house andMoreHot water flows from the boiler. Through the valve if it's open and circulates around the house and then back to the boiler and gets reheated that's the cycle of heating.

What is the advantage of pumping away?

When you pump away, you will save yourself time, money and expensive callbacks. By installing circulators on the supply, air will no longer be a problem. And air bubbles out in the system will be driven into solution and brought back to the boiler room. You will not have to bleed the individual radiators.

Where do you put a zone valve?

The zone valve needs to be positioned after the boiler and circulator of the central heating system. They can be located either on the hot side (before the hot water goes into the zone) or on the cold side (after the water goes throughout the building).

How many volts does a boiler zone valve use?

Zone valves operate electrically on 24 volts of direct current power provided by a 24-volt DC transformer located at the boiler. You can wire a boiler zone valve with the proper tools and basic electrical wiring knowledge. Advertisement.

How to connect mercury switch to thermostat?

The bulb is made from glass and its electrode will have a wire connected to the terminal with a screw. Tighten the terminal screw clockwise with the appropriate tip screwdriver to secure the wire to the thermostat.

What is a screwdriver thermostat?

Screwdriver. Thermostats are wired to boiler zone valves to control area heating. Hot water heating systems are divided into separate zones, each zone heating a different part of the home. For each thermostat located in the home, there will be a zone valve wired to the boiler to control the flow of hot water or steam to the respective area heater.

How to strip 18 gauge wire?

Strip 1/2-inch from both ends of each of the 18-gauge wires with wire stripping pliers. Bend open-end loops in each end of the two wires using needle-nose pliers.

How many zone valves can a sam transformer power?

Typically Sam one transformer can power up to a maximum 5 zone valves. Check the total VAC provided by your transformer against the total VAC draw should all four of your zone valves try to open at the same moment.

What does the red light on a zone valve mean?

When the zone valve is fully open, the red light goes on and energizes the end switch relay. The green light should always be on, indicating that power is connected. Priority Operation: When zone 3 is switched to the priority setting and is actuated, all other zones will stop operation until zone 3 is satisfied.

How much pressure does a water heater need?

At rest, the pressure is indeed about 12-15 psi generally, but after 2 or three cycles of the heater heating up water for the radiant heat, the pressure climbs to about 45psi, and the valve starts to bleed off pressure.

What is priority zone on a taco permit?

Watch out: some multiple zone controllers like your Taco permit assigning one of the zones as a "priority" zone - typically used to assure that an indirect fired water heater for domestic hot water supply will get priority over heating zones. That controller will turn off zones 1 and 2 when zone 3 is calling for heat if zone 3 is set up as "priority zone".