question about t-stat setting

aaron_4

Ok, so on zone values it will say .32 or what ever on the zone. But on a 3 speed pump how do I get the amp draw to know what the anticipator should be set at?

Thank you,
Aaron

Ken D.

Stat

Put an ammeter in series with the W circuit and read the amps directly. Or get a clamp on type and set it to 1.0 range or as close as you can get. If it does not go that low loop the wire 10 times around the jaws and divide reading by 10. That is your set point. The amps are usually from about .2 to 1.0

Empire_2

Anticipation

.32 on the zone valve is just a measurement of the valve itself. It does not take into account connecting wire to the t-stat. Like Don said measure at the t-stat. Your 110vac pump has no affect on the anticipation, however the pump relay can depending how the system is wired, but is usually separated by an additional t-former if using zone valves.

Mike T.

carol_3

I always admire your answers, Mike T, but this time I'm going to differ a bit. Since the thermostat is a switch, it doesn't have an amp draw. And the value of the wire, unless it's crazy long, is negligible. So just taking the .32 amp draw of the zone valve load should be close enough. Thanks for the reminder that the amp draw seen at the stat wouldn't include a line voltage pump, but might be a relay. The transformer isn't going to be a factor in the thermostat circuit because it's the power supply, not a load.

Empire_2

I admire that you admire my rambling Carol.

I think here, he was talking about a t-87 w/ anticipator and even though it is a switch, overloading the anticipator will result in a smoked t-stat. Add 4 of these zone valves and get ready to buy a new stat and smoke that one:-) Be very careful when assuming that older wire is in great shape. Original cable can wreak havoc on all types of controls. I guess if you wanted to you could ohm them out to be sure, but then again not many people do that including me....

Now Carol I need your assistance. Does the new t-stats, like digital without anticipation per/say, also need to have amp draws below 1.2 or so? What are the contacts rated for? Or is it all solid state control?

Thanks Much

Mike T.

Paul_67

Controlling multi-zone hot water pumps

I have a split level home with hot water heat set up for three zones (basement, living, upper) and the person before me appears to have all three thermostats wired together. This of course means that the bedrooms get warm and the living and basement are sometimes 5 degrees cooler. Really sucks when so cold out as it is right now. Do you have any wiring diagrams on what to do for a setup like I have. Right now all 3 thermostats splice together, go into boxes to control the pumps, then go to boxes and one wire comes out and goes to the boiler to turn on. I would like to have the three zones back again. Help!

brucewo1b

Paul the easiest thing to do

is get a Taco SR503EXP Circulator control, diagram in the box and on the cover, straightens out the multibox mess and wires.

carol_3

I'll try to find out. In all those years as the Honeywell rep, it never came up as an issue.

Empire_2

Paul

They may be grabbing power off of each zone and that doesnt mean the they are all wired together. Do you have zone valves with pumps or just pumps? If so are there Flo checks on each zone?

Mike T.

carol_3

The product specialist says 1.0.

aaron_4

t-stat

Thank you Ken, Mike, & Carol Fey for you replies to my question about the t-stat. I dont have zone valus on this job just two pumps. I just wasent sure about what the anticipator on the t-87 should be. I will try to put ammeter in series with the W circuit and read the amps directly. I did ohm them out because of the mess of wires.

aaron_4

t-stat

Thank you Ken, Mike, & Carol for your replies. I do not have any zone values on this job just 110vac pumps. I'll try and put an amp meter in series with the W circuit and read the amps directly. I do have two t-87 w/ anticipator for each zone. I did ohm them out to see which wires were what. One zone is an air handler and the other is baseboard. Here is a before and after pic. Thank you again aaron