These corrections are shown on the Fix drawing above.Ĭlick here to download a pdf of this month's Gitch and Fix.Ĭlick here for The Glitch & The Fix archives. A globe valve or other valve specifically intended for balancing should be used. It can be omitted and the injection controller configured to ignore this functionality.įinally, a ball valve is not a good choice for balancing the return injection riser. There is no need for the injection mixing controller to sense boiler return temperature with a mod/con boiler. The controls will respond to incorrect temperatures. In this position, the mixing between the incoming boiler water and system bypass water is not complete and the temperature has not settled to the final blended value supplied to the distribution system.ĭitto for the supply sensor of the injection mixing controller.
The boiler’s supply temperature sensor is mounted too close to the closely spaced tees. The Fix drawing shows the air separator installed so flow leaving the boiler passes through it in both space-heating and domestic water-heating modes. There is no air separator in the Glitch drawing. The Glitch drawing shows them upside down on the return side of the high-temperature zones. There also should be purging valves on the return side of all zone circuits and these valves need to be installed in the correct orientation. However, when doing this, be sure the injection pump has a built in check valve. per second with all circulators running), the injection pump can be piped across the headers as shown in the Fix drawing. Provided the headers are relatively short and generously sized (flow velocity less than 2 ft. above the pair of tees that connect to the mixed water temperature piping.įrom a design perspective, there is no need to create a primary loop in this system. To create an effective thermal trap, the pair of tees that connect to the hot-water piping must be at least 18 in. Radiant floor heating cost can vary depending on the system but averages 3,867 nationally, typically ranging from 1,687. Although the drop leg in the piping might constitute a trap of sorts, it will not stop heat migration into the injection risers. Radiant heat flooring is another great way to keep you warm in the winter. Another problem is the lack of a thermal trap, or spring-loaded check valve, to stop heat migration through the injection risers when the injection pump is off but the “primary circulator” is operating.
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