Field Controls 46381400 User manual

COMBUSTION AIR SYSTEM

Model: CAS-2B-90E Furnace Boot™

This product is designed for use on the Beckett AFG 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 1.5 gph at 100 psi input

pressure or equivalent.

“The Furnace Boot™ model CAS-2B-90E is for use only on

the designated burner(s) as described in these instructions

only when the specific burner includes this Furnace Boot™

when shipped from the burner manufacturer or where the

burner instructions specifically reference the model CAS-2B-

90E Furnace Boot™ as an optional air intake system.”

ITEMS INCLUDED IN KIT:

1 -90E Furnace Boot™

1 -Set of Gaskets

1 -4” VRV

1 -4” IAH Hood

1 -Burner Coupling Set

2 -Mounting Bolts

INSTALLER SUPPLIED ITEMS:

Duct Piping and Elbows

90° Elbows;

¼ “ NPT Female x ¼” NPT Male for

routing oil line

4” IAH

HOOD

4” VRV

FURNACE

BOOT™

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 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. Under this condition, the VRV gate opens,

stabilizing and maintaining proper airflow to the burner. The

VRV gate closes again once the abnormal condition is

corrected.

INSTALLATION

1. Before the Furnace Boot™ can be mounted, a rectangular

hole (2 ½” X 6”) must be located and cut into the side of the

furnace cabinet. The hole is located from the center of the

burner intake. (See Figure 1)

2. Remove the oil pump and air bands from the burner

housing! Install the sealing gaskets onto the burner

housing. (See Figure 2) Replace existing pump coupling

with the coupling supplied with the Furnace Boot™.

Position the Furnace Boot™ over intake on the burner

housing. Align the holes in the Furnace Boot™ with the

holes in the housing and re-attach the oil pump. (See

Figure 3) Note: Replace pump coupling with the coupling

supplied with kit. The Furnace Boot™ extension is mounted

from the outside of the furnace cabinet and can be

mounted to allow the routing of the duct pipe from the

ceiling or from the floor. (See Figure 4) Assemble VRV

balance weight onto the gate. Screw the weight all the way

in. Then attach lock nut and knurl nut. (See Figure 4)

Figure 1

Figure 2

Figure 3

Figure 4

Page 3

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. (See Figure 5)

b. Push the pan as far as the pan can go. The pan

will be approximately 5/8” from the air

adjustment blades. (See Figure 6)

4. Mount VRV tee assembly or 90° elbow onto the

Furnace Boot™ intake. Fasten using three (3)

sheet metal screws on all joints. (See Figure 4)

5. Assemble VRV balance weight onto the gate.

Screw the weight all the way in. Then attach lock

nut and knurl nut. (See Figure 7)

6. 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 8)

7. Refer to Figure 9 for general installation layout.

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 from either side of the

vent termination and on the same wall if sidewall

venting.

3. Always mount with the inlet vent termination

opening pointing down.

Figure 8

Figure 5

Figure 6

Figure 9

Figure 7

Page 4

INSTALLATION OF INLET VENT TERMINATION

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.

INSTALLATION OF DUCT WORK

1. 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. Consult flex duct

manufacturer for equivalent lengths.

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.

2. Route the 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 -10°F or

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

OPERATION: AIR ADJUSTMENT

1. Adjust the air adjustment knob on the side of the

Furnace Boot™ (See Table 1) to rough air setting.

2. Start the burner and adjust the air control as

needed to achieve the required CO2 and smoke

levels. Set over fire draft to appliance

manufacturers’ specifications (typically -.02” of

water). 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.

3. Next, adjust the VRV gate by screwing the adjustment weight in until the VRV gate is just closed.

4. Re-check the burners operation and adjust accordingly.

5. Lock the adjustment weight in position by tightening the hex nut on the VRV gate.

Pipe

Diameter

Maximum Linear

Feet Feet/Elbow*

5” 60’ 9’

6” 90’ 11’

*Subtract footage from the maximum linear feet for every 90° elbow

P/N 46381400 REV A 6/00

Table 1

ROUGH AIR SETTING

GPH Knob Setting

.75 25°

1.00 60°

1.50 160°

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