T8775C compatible with L8148J Aquastat?
#1
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T8775C compatible with L8148J Aquastat?
Hi,
I have a T8775C (digital round, power stealing) thermostat hooked up to a L8148J aquastat connected to my boiler. Most of the time the thermostat successfully communicates with the aquastat and the boiler/circulating pump kicks on when the temp. drops below the set point on the thermostat. However, from time to time (maybe 1x/week or so), the room temp will be below the set temp. and the boiler/circulating pump won't kick on. To resolve this, I usually have to lower the set temp well below the room temp. and wait a few minutes before raising the set temp. back up above the room temp...then the heat kicks on, usually.
The thermostat is approx. 4 yrs old and the aquastat was replaced 2 years ago for a different problem (circulating pump would go on but boiler wouldn't fire). As the L8148J is a millivolt circuit, could it be incompatible with the
T8775C as this is a "power stealing" thermostat?
Any help would be greatly appreciated.
Thanks!
I have a T8775C (digital round, power stealing) thermostat hooked up to a L8148J aquastat connected to my boiler. Most of the time the thermostat successfully communicates with the aquastat and the boiler/circulating pump kicks on when the temp. drops below the set point on the thermostat. However, from time to time (maybe 1x/week or so), the room temp will be below the set temp. and the boiler/circulating pump won't kick on. To resolve this, I usually have to lower the set temp well below the room temp. and wait a few minutes before raising the set temp. back up above the room temp...then the heat kicks on, usually.
The thermostat is approx. 4 yrs old and the aquastat was replaced 2 years ago for a different problem (circulating pump would go on but boiler wouldn't fire). As the L8148J is a millivolt circuit, could it be incompatible with the
T8775C as this is a "power stealing" thermostat?
Any help would be greatly appreciated.
Thanks!
#2
That is an unreliable thermostat. I recommend a Honeywell thermostat that requires batteries if you cannot supply a C (common) wire to your stat. A non-digital would also work.