How can I connect a WIFI thermostat to a Honeywell R845A switching relay?


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According to this document, the internal wiring of that relay looks like this.

It sounds like it's connected something like this.

When the thermostat calls for heat, the T terminals are connected through the thermostat. This causes the relay to energize, which closes the contact between terminals 5 and 6 (It also closes a contact between 3 and 4). When terminals 5 and 6 are connected, the heater, pump, valve, etc. turns on.

Because the transformer is built into this device, it's going to be difficult (possibly impossible) to connect a C wire. You'd have to connect the wire to the other side of the transformer, something like this.

You'll also have to check with the manufacturer, to determine if the transformer can handle the additional load of the thermostat.

You might want to contact Honeywell, to see if they offer a similar relay that exposes the C terminal. If they do, you could replace this device with the one...

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What Grady said...

I never disagree with Grady! It's not good for ya.

I'll just 'expand' a little. Grady said 'wiring will be very similar'. The only thing that's really different is the designators for the thermostat connection to the aquastat. Where you will have 5 and 6 on each relay wired together, they will to go T and TV on your aquastat. Obviously in addition to removing the circ from C1 and C2, you also need to move the original thermostat from T and TV and wire it to one of the relays. (and just ignore the wiring to the oil burner, as you won't be touching B1 and B2 anyway).

Grady, the E version of the 8148 is for our purposes the same 'functionally' as the J version, with the exception of the vent damper connections, and associated damper proving switches, correct...

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Smart thermostats can be divided into two broad categories- ones that offer internet connectivity to allow you to program and manage the thermostat and learning thermostats that automatically learn about your references to eliminate the need to program them manually. There are some great options in both of these categories.

There are some other great smart thermostats, like Ecobee thermostats that recently came up with e]ecobee 3, Honeywell thermostats with its Prestige series of smart thermostats and much more. These thermostats too, come with features, like Wifi connectivity, remote management through mobile and laptop and learning features with the help of which they program themselves to suit your preferences automatically - Advantages of Using a Wifi...

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I need help with wiring a relay. I have two boilers and four separate zones with four circulator pumps. I had 3 zones on one boiler and 1 on the other. I now moved one of the three zones to the boiler with the one zone so now I have two boilers with two zones each and I need help in figuring out the wiring.

How do I wire these relays. I am attaching pictures.

Additionally, how do I troubleshoot these relays as it seems that one of the relays is not turning on the circulator pump. If I jump the two T terminals that should make the circulator start, right? As I can turn on the circulator by pressing on the contactor, however turning on the thermostat does not turn on the circulator pump.

How do I test the relay to see if it's good or if it needs replacing.

Also how do I wire the relay, to get power for another...

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I am not an expert the wiring used on old boilers with zoning. The circuits are simple so it just a matter of understanding the configuration.

It sounds like you have three thermostats each connected to a relay. One relay is different than the other two. The three relays control three independent zone valves. The relays are needed since the values use 120V for operation.

How are the relays wired to the boiler and circulator pump? Are there 24V outputs wired in parallel?

Now back to your original problem. Are you planning to install a WiFi thermostat on one zone? If so, then I think you are better buying a relay that has a C (ground) wire output rather than switching relays.

Another method is to wire a second 24V transformer to the thermostat. There are some YouTube videos showing how it is done. The problem with this method is the the relay and the second transformer must be wired to the same phase of the 120V line voltage. If the are are out of phase...

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Wiring Diagram...

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Hi. I'm Megan Wollerton for CNET and today I'm gonna show you how to install this Honeywell Wi-Fi Smart Thermostat. I'll assume that you've already gone through your circuit breaker and turned off your AC and that you've removed your old thermostat. So these are the wires I have behind my old thermostat. This is the Y wire, this is the W, this one's the G, and this one's the RH. The thing about this Honeywell Thermostat is that it needs a C wire to operate optimally. I don't have a C wire so that's a bit of a problem for me. There are some workarounds that you can use if you have access to your HVAC unit, but unfortunately my HVAC unit is really old and doesn't actually have a terminal port. If you don't have the C wire, a really easy workaround is this power cord that Honeywell provides, but it's not ideal because it's a big power cord. There are some other ways around this without using the power cord, but you might need to get an electrician to...

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R = Red or power from the 24v transformer. You do need the jumper in your case.

Y = Yellow this is the air conditioning wire

G = Green in your case likely to be the brown/tan is the fan wire

W = white or the heat wire, in your case most likely the blue wire.

Go to the furnace and find the control board or where the t-stat wire hooks up to it and see what terminals the wires are on and then just hook the same wires up to the corresponding terminals on the t-stat.

Old 4 wire systems use those color wire setups. It is usually done like I mentioned above.

R = power
Y= A/C
Y2= 2nd stage A/C
W = heat
W2 = 2nd stage heat
G = fan
B = Aux heat in a heat pump application
O = Aux cooling
RC = control power for the t-stat usually and on some is the common wire.
C = common

You can take the panels off the furnace and I am sure you can find the t-stat wire it's the only one like it, and look how it...

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Use a few household tools to hook up a new thermostat.

Older thermostats are not as accurate as newer models. In addition, a programmable thermostat can potentially lower energy consumption and costs when the thermostat is used to automatically adjust the temperature while you are away.

Disconnect the power to the thermostat at the main circuit breaker.

Remove the faceplate of the old thermostat. The face plate is usually not screwed into the base plate or thermostat and will snap or twist off.

Disconnect the wires from the thermostat by turning the screws on the connectors. Do not allow the wires to fall back into the wall. You may need to pull them further out of the wall and can tape them to the wall to hold them in place.

Remove the screws holding the old thermostat and base plate to the wall. Remove the old thermostat and base plate.

Hold the new thermostat base plate in place on the wall and mark the screw holes with a pencil. Set...

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Honeywell Switch R845A User's Manual

Honeywell Switch R845A User's Manual

Open as PDF Similar pages Honeywell TRADELINE R482J User's Manual R182J, R482J, R845A, R847A, R882J, RA89A, RA832A Switching Relays Application Enhanced Single Zone Switching Relay Catalog 100-5.3: Single Zone Switching Relay R182J, R482J, YHR845A,R847A, RA89A, RA832A Switching Relays INSTALLATION INSTRUCTIONS Submittal 101-053: Single Zone Switching Relay 14...
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