Indirect dhw??

Cyclist77 · March 11

We have a Weil-McClain I direct dhw tank. This along with the Weil-McClain CGa3 were installed in November. One thing I seem to be noticing is that it calls for the boiler to respond when not all that much hot water is used. I hope I am being clear.

Advice?

Thanks!

hot_rod · March 11

If it is this tank, I'm not thrilled about the control location at the bottom. As soon as you open a faucet cold enters the tank and hits that control turning on the boiler. looks like cold water in #6, blasts right at the thermostat #2, across the tank?

More commonly the sensor is mid point on the tank so you draw 10 gallons or more before the sensor sees cold water and turns on. The HTP example.

The sensor down low starts the boiler sooner for recovery, but may cause the quick cycles you see.

Where is your sensor and control?

Cyclist77 · March 12

Bob,thanks for your reply.

It is like you describe. The cold water inlet appears to be opposite of the sensor. So I guess I need to live with it.

mattmia2 · March 13

it all depends on your application. i have the htp and wish it started heating earlier in a draw of hot water because in winter I have very cold incoming water and a smallish tank that is dependent on the boiler for a good amount of the hot water available and by the time the well cools and the boiler pre purges and ramps up, half the tank is gone and the boiler doesn't have enough output to make up for that.

hot_rod · March 13

if it really bugs you get an electronic setpoint control, poke a hole in the outer jacket and slide the sensor mid tank

Any temperature control can trigger a boiler

I remember a solar tank that had tracks down the tank so you could slide a sensor at any level on the tank.

I would not want the sensor and CW inlet next to one another. That seem like an odd design

mattmia2 · March 13

https://forum.heatinghelp.com/discussion/comment/1891486#Comment_1891486

my thoughts are more along the lines of add a button i can push to the control processor program that controls the heat for the basement and garage that makes a heat call to the boiler for 5 or 10 minutes or something like that at about the setpoint of the tank(and opens the dhw zone valve).

the tank is controlled of a thermistor by the boiler so if i remember the dhw pump terminals on the boler control a relay that controls the dhw zonr valve then all of the end switches control a relay that controls the circulator.

4GenPlumber · March 13

Do you have a thermostatic mixing valve? I keep my indirect at around 170 and knock it down with a mixing valve to 120, it decreases the draw from the tank so it is not constantly firing. A re-circ line with a pump entering the heater near the aquastat can also help with stratification, but it needs to run continuously which reduces efficiency and the life of the pump.

mattmia2 · March 13

https://forum.heatinghelp.com/discussion/comment/1891486#Comment_1891486

you could do the same with the wm tank to lengthen the cycles.

Indirect dhw??

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