User manual FIELD CONTROLS 46381400

[. . . ] Typical problems can be caused by blockage of the intake termination, icing up of the ductwork 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 airflow. [. . . ] (See Figure 4) Figure 2 Figure 1 Figure 3 Figure 4 Page 2 3. For low firing rate applications with burner inputs up to . 75 GPH only: a. Insert flow restrictor pan in the inlet collar with the flat of the pan inward. The pan will be approximately 5/8" from the air adjustment blades. Mount VRV tee assembly or 90° elbow onto the Furnace BootTM intake. Fasten using three (3) sheet metal screws on all joints. Assemble VRV balance weight onto the gate. 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 9 for general installation layout. Figure 6 Figure 5 TERMINATION LOCATION GUIDELINES 1. 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. Figure 7 Figure 8 Figure 9 Page 3 INSTALLATION OF INLET VENT TERMINATION 1. 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. [. . . ] 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. Table 1 ROUGH AIR SETTING GPH . 75 1. 00 1. 50 Knob Setting 25° 60° 160° 3. Next, adjust the VRV gate by screwing the adjustment weight in until the VRV gate is just closed. [. . . ]