On Jan 27, 2:41 pm, wrote:
On Jan 23, 4:47 pm, wrote:



I'm helping someone puzzle out a system-

Radiant hydronic in-floor, gas boiler, circulator pump located near the
loop, not at the boiler:

- room thermostat is paralleled with a thermostat in the mixing valve
- room thermostat 'sends' a call for heat to the boiler
- circulator pump is controlled by a goldline SP32D, set to turn on
the circulator when the sensor (don't know for sure where it is) is
below 60 deg. F.

Does this sound like I've puzzled it out somewhat correctly?

Is it normal to leave the circulator pump on below some sensed
temperature (sensed in the slab? outdoors?), and just use the call for
heat to modulate the water temperature?

DaveI have confirmed that the thermostat (paralleled air thermostat and
water loop temp thermostat only does the call-for-heat to the boiler,
and that the circ. pump runs whenever the outside temp. is below the
goldline setpoint.

Dave


Ahhh, finally some info.
Mid-late '90s Stadler was a fan of installing systems where the circ.
pump always runs below the outdoor reset temp., and the thermostat
just does the call-for-heat.

Dave