Jan 28, 2026 - 05:51 AM
If you have a GVD vent damper the switch on the backside of unit as indicated by the label is an automatic/hold open switch. When the switch is in the automatic mode it will open and close with the call for heat from the boiler. In the hold open position once the damper is opened it will stay in that position.
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Question: Where to buy
Answer: You can purchase the unit from a local distributor in your area. You can find a distributor on our distributor locator: https://www.fieldcontrols.com/find-a-...
