User manual FIELD CONTROLS 46330800

[. . . ] COMBUSTION AIR SYSTEM Model: CAS-2WM WEIL-MCLAIN OUTSIDE AIR KIT FOR USE WITH OIL BURNER MODELS QB-180 & QB-300 4" VRV AIR BOOTTM 4" IAH HOOD The Air BootTM model CAS-2WM is for use only on the designated burner(s) as described in these instructions only when the specific burner includes this Air BootTM when shipped from the burner manufacturer or where the burner instructions specifically reference the model CAS-2WM Air BootTM as an optional air intake system. ITEMS INCLUDED IN KIT: 1 - Air BootTM 1 - 4" VRV (Vacuum Relief Valve) 1 - 4" IAH Hood 1 - Set of Gaskets 1 - Burner Coupling Set 2 - Mounting Bolts INSTALLER SUPPLIED ITEMS: Air Duct Pipe and Elbows as needed -use 4" Dryer Venter, Aluminum or Galvanized Steel ¼" NPT 90° street ell for oil line if needed Exterior rated caulk, silicone sealant or equivalent THE PURPOSE OF THE VACUUM RELIEF VALVE (VRV) The vacuum relief valve provides combustion air to the burner if the outside air supply is interrupted for any reason. Typical situations would be blockage of the air intake or duct, or wind effect which cause a negative pressure at the air intake hood. VRV OPERATION With normal air flow through the air intake hood and duct, the VRV stays closed. [. . . ] Figure 3 Figure 2 Figure 1 Rotate Oil Solenoid valve and realign 90° fitting as shown below. Do not reconnect the oil line as in E and F until you have installed the Air BootTM Page 2 Figure 4 9. Mount the VRV tee assembly or 90° elbow onto the Air BootTM intake. Fasten using three (3) sheet metal screws on all joints (See Figure 5). Mount the VRV assembly onto the tee and fasten with the supplied screw and nut in collar tabs. To ensure proper operation, Check the gate for being level across the pivot points and plumb (See Figure 7). Locate the air intake hood at least 3' (feet) BELOW (or 6 feet horizontally from) any appliance VENT termination. When the appliance is sidewall vented, locate the air intake hood on the same side of the building as the appliance vent outlet. To install the air intake hood, cut a 4 ¼" hole through the side of the building. Seal around the exterior plate with an exterior rated caulk, silicone sealant or equivalent. Locate the air hood so the air piping length doesn't exceed the limits below: Number of Elbows 2 to 4 5 6 7 Maximum Length of Air Pipe 35 Feet 28 Feet 21 Feet 14 Feet Figure 6 Figure 5 8. Construct the air duct piping with 4" diameter dryer vent or aluminum or galvanized steel pipe, using as few elbows as possible. Fasten and support the air duct piping to prevent damage and separation of joints. Figure 7 Figure 8 Page 3 ADJUSTMENTS AIR INTAKE BOOT AIR SETTING 1. [. . . ] After you have completed adjusting the burner, adjust the VRV counterweight. With the burner running normally, rotate the counterweight screw counterclockwise until the gate just begins to open. If OK, hold the counterweight screw in position and tighten the hex nut against the gate to lock the screw permanently in position. Page 4 P/N 46330800 Rev D 11/00 [. . . ]