Field Controls WXGA+ 190CW7CS user manual

Summary of the content on the page No. 1

COMBUSTION AIR SYSTEM
Model: CAS-2A





4” VRV








AIR BOOT™
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.
“The Air Boot™ model CAS-2A is for use only on the designated burner(s) as described in
these instructions only when the specific burner i

Summary of the content on the page No. 2

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.

Summary of the content on the page No. 3

2. Assemble VRV balance weight onto the gate. Screw the weight all the way in. Then attach lock nut and knurl nut. (See Figure 3) 3. 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. (See Figure 4) 4. Refer to Figure 5 for general installation layout. TERMINATION LOCATION GUIDELINES 1. Mount intake hood 12 inches above finished grade. If mounting on the side o

Summary of the content on the page No. 4

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 Maximum Equivalent Elbow* Reducer or Pipe Pipe Feet (between Air boot™ Equivalent Increaser Diameter and duct termination) Feet Equivalent Feet 4” 44’ 7’ - 5” 60’ 9’ (4” to 5”) 3’ 6” 90’ 11’ (4” to 6”) 6’ *Note: Subtract the elbow or reducer equivalent feet from the maximum equival