Field Controls 46255400 User manual

COMBUSTION AIR SYSTEM

Model: CAS-1

This product is designed for use on the Beckett AFII Series oil burners and

AF/AFG Series oil burner with a combustion air intake. 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.

4” IAH HOOD

4” VRV

Page 2

THE PURPOSE OF THE VACUUM RELIEF VALVE (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. The VRV gate

operates on changes in the vacuum pressure generated by the

inlet to the oil burner.

VRV OPERATION

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

air flow. Under this condition the VRV gate opens, stabilizing and

maintaining proper air flow to the burner. The VRV gate closes

again once the abnormal condition is corrected.

INSTALLATION

MOUNTING ON BECKETT AFII SERIES BURNER

1. Remove burner inlet cover. (See Figure 1)

2. Mount VRV tee assembly or 90o elbow onto the burner inlet.

Fasten using three (3) sheet metal screws on all joints. (See

Figure 2)

3. Assemble VRV balance weight onto the gate. Screw the

weight all the way in. Then attach lock nut and knurl nut.

(See Figure 3)

4. Mount the VRV assembly into the tee and fasten with a

screw and nut in collar tabs. (See Figure 4) To ensure

proper operation, check the gate for being level across the

pivot point and plumb.

MOUNT ON BECKETT AF/AFG SERIES BURNERS WITH A COMBUSTION

AIR INTAKE

1. Mount VRV tee assembly or 90o elbow onto the combustion

air intake inlet. Fasten using three (3) sheet metal screws on

all joints. (See Figure 5)

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. (See Figure 4) To ensure

proper operation, check the gate for being level across the

pivot points and plumb.

Figure 1

Figure 2

Figure 3

Figure 5

Figure 4

Page 3

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.

2. Mount at least 12 inches away and on the

same wall if sidewall venting.

3. Always mount with the inlet vent termination

opening pointing down.

INLET VENT TERMINATION INSTALLATION

1. Cut a 4 1/4" diameter hole through the

sidewall of the building.

2. 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 WORK INSTALLATION

1. Duct length distance, a maximum of 30

linear feet of standard duct pipe and two (2)

90o elbows. Subtract 7 feet from the

maximum linear feet for every 90o elbow

added. Maximum linear footage will be less

for flex duct. Consult manufacturer for

equivalent lengths.

2. Route duct work from the VRV tee to the inlet vent termination with as minimum a number of

elbows as possible.

3. 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.

4. To reduce uncontrolled air leakage into the duct, tape all joints and seams using standard duct

tape.

Note: To prevent sweating on the outside of the duct, when operating in areas that have -10oF or

below design temperatures. Insulate the duct work at least 10 feet from the inlet vent termination.

Figure 6

Figure 7

Page 4

PN 46255400 Rev D 06/00

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