Replacing a hot water circulator

Old 04-22-19, 08:07 AM
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Replacing a hot water circulator

Our hot water circulator started buzzing and causing noise in my pipes. I plan on swapping it with the same make and model so I just have to drop the new one in. I saw the instructions stated “Air should be vented from the system by means of an air vent located at a high point in the system.” Exactly how do I go about doing this? Is this as simple as opening a tap? I have two 50 gallon hot water heaters connected to each other in my attic and the circulator is connected to a pipe coming from the second water heater’s drain. After doing some reading, I was concerned with airlock after installing a new circulator. I do have shutoff valves directly on either side of the pump. Thanks in advance for any advice. Below is a link to the circulator I have.
Old 04-22-19, 06:58 PM
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Those instructions are for a closed system. That would be a system with baseboard radiators. You are dealing with a hydronic DHW setup and every time a hot water faucet is opened.... any air in the system will be purged.

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