User manual FIELD CONTROLS 46385600

[. . . ] COMBUSTION AIR SYSTEM Model: CAS-2A 4" VRV AIR BOOTTM 4" IAH HOOD This product is designed for use on the following burners, for the purpose of routing combustion air directly to the burner, with the added safety feature of the vacuum relief valve. NOTE: For burner inputs up to 2. 0 GPH at 100 PSI input pressure or equivalent. [. . . ] To ensure proper operation, check the gate for being level across the pivot points and plumb. 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. 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. 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. Route the duct work from the VRV tee to the inlet vent termination with as minimum a number of elbows as possible. Secure and support the duct work for the design and weight of the material used, to prevent physical damage and separation of joints. For guidelines refer to recognized national building codes or according to any local codes. To reduce uncontrolled air leakage into the duct, tape all joints and seams using standard duct tape. [. . . ] Next, adjust the VRV gate by screwing the adjustment weight in until the VRV gate is just closed. Lock the adjustment weight in position by tightening the hex nut on the VRV gate. Page 4 PN 46385600 6/00 [. . . ]