Plumbing Connections

The sample gas can be transported from the sample port on the furnace to the bottom of the external filter on the side of the electrical enclosure using silicone tubing. The sample flow should be between 4.0 and 5.0 SCFH.  Silicone tubing should also connect the ports on the side of the electrical enclosure to the probe in the heater enclosure.  Connect tubing from the fitting on the electrical enclosure marked “To Probe Reference” to the “Ref. Air” port on the probe.  A connection should also be made between the “To Burnoff Port” fitting and the “B.O.” fitting on the probe.  There is a barb fitting on the stainless steel well on the heated probe.  This is the vent, which needs to be routed to an appropriately safe location.