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Low Pressure Switch Location
The combi heating unit does not have a LWCO or a low pressure switch on the heating module. It does have a high temp sensor on the domestic tank but that will only shut down the system until the unit cools and then will re-fire. I would like to install some protection beyond that in the event of no or low make-up water.
I will not be using an auto-fill since the supply water is from a well with a water softener. I'll be using deionized water, no glycol, for the make-up water with no auto-fill.
I was considering using a Honeywell Pressuretrol Controller w/ Auto recycle (2 psi to 15 psi) for low pressure protection that would be tied in series to the TT circuit, so that if there is low pressure the hydronic module would not fire which would also shut off the pumps.
I thought a low pressure switch would be more proactive than a LWCO.
I was going to put the low pressure switch in the Tee below the air eliminator and above the pressure tank.
I'd like to know if this is a correct placement for the pressure switch and my idea in general.
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