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THE PURPOSE OF THE VRV
The Vacuum Relief Valve is a safety device to guard against combustion problems associated with directly
connecting oil burners to the outside. Typical problems can be caused by blockage of the intake termination,
icing up of the duct work and effects of leeward side wind effects on a building.
VRV OPERATION
The VRV gate operates on changes in the vacuum pressure generated by the inlet to the oil burner. The VRV
gate will remain closed during normal burner operation. During an abnormal operation (i.e., blockage of the
intake or change in external building pressures) an increased negative pressure on the intake of the burner
causes a reduction in burner air flow. Under this condition, the VRV gate opens, stabilizing and maintaining
proper air flow to the burner. The VRV gate closes again once the abnormal condition is corrected.
INSTALLATION
1. Remove the oil pump and air bands from the
burner housing. Position the Air Boot™ over the
burner housing on the intake. Align the holes in the
Air Boot™ with the holes in the housing and re-
attach the oil pump. (See Figure 1) NOTE: Replace
pump coupling with the coupling supplied with kit.
Mount VRV tee assembly or 90° elbow onto the Air
Boot™ intake. Fasten using three (3) sheet metal
screws on all joints. (See Figure 2)
Figure 1
Figure 2