User manual FIELD CONTROLS 46385600

[. . . ] 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. [. . . ] Mount the VRV assembly onto the tee and fasten with a screw and nut in collar tabs. To ensure proper operation, check the gate for being level across the pivot points and plumb. Refer to Figure 5 for general installation layout. Mount intake hood 12 inches above finished grade. If mounting on the side of a building prone to drifting snow, mount 12 inches above the snow line. Mount at least 12 inches from either side of the vent termination and on the same wall if sidewall venting. Always mount with the inlet vent termination opening pointing down. Cut a 4-1/4" diameter hole through the sidewall of the building. Slide the inlet vent pipe through the hole and fasten to the wall with appropriate fasteners. Seal the edges of the mounting plate with a silicone sealant or equivalent. Duct length distance, a maximum of 30 linear feet of standard duct pipe and two (2) 90° elbows. Subtract 7 feet from the maximum linear feet for every 90° elbow added. Maximum linear footage will be less for flex duct. Consult flex duct manufacturer for equivalent lengths. Figure 3 Figure 4 Figure 5 Page 3 Longer pipe lengths require the use of a larger pipe between the VRV and the intake hood. It also requires the use of a vent pipe increaser at the VRV and a reducer at the intake hood. (See Table 1) Table 1 Pipe Diameter 4" 5" 6" Maximum Equivalent Pipe Feet (between Air bootTM and duct termination) 44' 60' 90' Elbow* Equivalent Feet 7' 9' 11' Reducer or Increaser Equivalent Feet (4" to 5") 3' (4" to 6") 6' *Note: Subtract the elbow or reducer equivalent feet from the maximum equivalent feet to get maximum linear feet of pipe 2. [. . . ] Secure air control knob with indicator bracket. If draft levels are not obtainable or controllable, use standard industry methods to control the draft or call the Field Controls Tech Line at 1-800-742-8368 for more information. Next, adjust the VRV gate by screwing the adjustment weight in until the VRV gate is just closed. [. . . ]