Field Controls 190CW7CS Burner User Manual


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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
Maximum Equivalent
Pipe Feet (between Air boot™
and duct termination)
Elbow*
Equivalent
Feet
Reducer or
Increaser
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 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.
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.
AIR ADJUSTMENT
1. Adjust the air adjustment knob on the side of the Air Boot™ (See Table 2) to rough air setting.
Table 2
ROUGH AIR SETTING
GPH Knob Setting
.75 70°
1.00 90°
1.50 135°
2. Start the burner and adjust the air control as needed to achieve the required CO
2
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.
PN 46385600 6/00
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