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Posted by HeatPro on January 18, 2006 at 11:06:01:
In Reply to: Re: Ergomax and boiler wiring and settings posted by Dave on January 18, 2006 at 10:25:27:
: So, what temp do you think I should set the ergomax to (say if i set it to 160, it would call for heat at 153 and shut down at 167)?
: However, it would shut the boiler off at 167 before it gets to the operating temp of 180. Would that be ok?
Yes. You can set that thermostat limit to 167, and it would be OK for most of the year.
The reason I said to attach the boiler pump/burner control wires to the largest zone pump relay (in parallel with the outdoor reset and tank control) for the largest fan coil zone is that by doing so, you can have the water go up as high as needed beyond that 167F control when needed.
In fact, as long as you are keeping your indirect in the system, you don't need to use the Ergomax thermostat at all, as the outdoor reset will keep the water temperature enough for the heat. The domestic water heater you have will take care of its own water temperature with the Ergomax as a preheater. This will allow the system to be warm enough to prevent condensation and also allow the water temperature to be kept lower until needed to save energy from standby loss.
The simple T475A outdoor reset you were going to use will be as effective as the more expensive electronic model because the system is attached to 3 air handlers, the indirect water heater, and the radiant floor which are not as linear as the electronic outdoor reset is going to expect. You won't be able to program in the different heating mode needs specifically for fan coil and radiant floor in the controller. Depending on what kind of radiant floor you have, the water temperature of 167F is more than most use.