Install a swing check valve on the return side of each zone to block the return side. Step 4: Remove a Malfunctioning Valve Listen to hear if the zone valve is making noise, or is making too much noise, and not opening the valve. The next step is to calculate the head loss, or pressure drop in the system. Measured in gallons per minute (GPM), the flow rate of a. We can only do whole zone valves, so the answer is that five of these zone valves can be wired to a 40 VA transformer. The basic component of a zoned heating system is a zone valve, which controls the flow of water in a hydronic heating system. The noise sounds like it is coming from a Taco 241 Swet-Chek valve. If the gears are stripped, or the motor or mechanism jammed, the lever won't move. Typically the pump runs when there is a call for heat - i.e., when the thermostats get turned up.
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