Plumbing Connections

The sample gas is transported from the furnace to the electrical enclosure filter using silicone tubing.  The sample flow should be between 4.0 and 5.0 SCFH.  Connect the ports on the side of the electrical enclosure to the probe in the heater enclosure using silicone tubing.  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.