Water Heaters - Amtrol Boilermate-Hot water too hot.
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12nolan12
01-30-09, 06:10 PM
We installed a radiant heat system and an Amtrol 41Z top down add on for domestic hot water in the fall of 2005. It has worked well until a couple of weeks ago.
The hot water suddenly became hotter than the dial control was set for. You can turn the control and cause the pump that circulates to the boilermate to start but it is way above the temperature we want.
The boiler we have is a NY Thermal T150 which has priority wiring for domestic hot water. The radiant hydronic heat system draws off a primary loop with a pump that puts water to the heating loops. The boilermate is on a secondary loop with a check valve between the supply and return lines on this secondary loop.
So far I have replaced the aquastat (about $70) but it acts the same. I also took the check valve apart and everything in it seems to be move freely. Thecheck valve is a an all brass Sparco 1 flowcheck.
The maximum temperature for the radiant system is set for 138. The boiler operates on a curve with an outside temperature sensor so the water in the radiant system is generally about 120 to 125 except in below zero temperatures. Is the water somehow always going through the secondary loop and heating it hotter than necessary? Any ideas? The water may have been the hottest during a recent cold spell in upstate NY.
The hot water suddenly became hotter than the dial control was set for. You can turn the control and cause the pump that circulates to the boilermate to start but it is way above the temperature we want.
The boiler we have is a NY Thermal T150 which has priority wiring for domestic hot water. The radiant hydronic heat system draws off a primary loop with a pump that puts water to the heating loops. The boilermate is on a secondary loop with a check valve between the supply and return lines on this secondary loop.
So far I have replaced the aquastat (about $70) but it acts the same. I also took the check valve apart and everything in it seems to be move freely. Thecheck valve is a an all brass Sparco 1 flowcheck.
The maximum temperature for the radiant system is set for 138. The boiler operates on a curve with an outside temperature sensor so the water in the radiant system is generally about 120 to 125 except in below zero temperatures. Is the water somehow always going through the secondary loop and heating it hotter than necessary? Any ideas? The water may have been the hottest during a recent cold spell in upstate NY.