Lennox-hearth ELITE VINT-DVS-U User Manual download pdf (Page 15)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Flue Opening in the

top of the ﬁrebox

Restrictor

Installed Over

Flue Opening

Figure 23

Figure 25

Figure 24

Flue Restrictors

The ﬂue restrictor settings shown in Figures 26 and 27 are for typical

installations and may need to be adjusted from standard to take into

account other variables in the installation to achieve proper combustion.

See Flue Restrictor Guidelines on this page to assist you in making a

proper ﬂue restrictor adjustment.

This appliance uses balanced ﬂue technology to ensure proper combus-

tion. A ﬂue restrictor may need to be installed depending on the vent

conﬁguration of your stove. The drawings on Page 16 show all the al-

lowable pipe conﬁgurations for this appliance. To properly install the ﬂue

restrictor, ﬁnd your pipe conﬁguration in the drawings on Page 16 and

note which restrictor setting is recommended. The ﬂue restrictor and two

black self-tapping 5/32” allen head screws can be found in the ﬁrebox

in a plastic bag. The restrictor should be placed over the ﬂue opening

on the ceiling of the ﬁrebox. On the restrictor, two self-tapping 5/32”

allen head screws should be installed in either holes 1, 2, 3, or 4 in the

restrictor and screwed into the two holes in the ﬁrebox ceiling. See the

drawing to the right for the location of hole numbers on the restrictor. The

numbered holes in which the screws are inserted in the restrictor should

correspond to the restrictor position numbers found on the drawings for

your pipe conﬁguration. Restrictor positions are based on tests run in

a laboratory. The optimum restrictor positions may need to be adjusted

slightly depending on the conditions surrounding the residential instal-

lation. Do not adjust restrictors to a point where the ﬁreplace is sooting.

Notes: The higher the number of the ﬂue restrictor position, the greater

amount of combustion air will be delivered.

Flue Restrictor Adjustment Guidelines

After the ﬂue restrictors have been set to the standard settings as shown

in Figures 26 and 27 on Page 16, the burner ﬂame appearance should be

evaluated to determined if the ﬂue restrictors need to be set to a different

position to adjust for variables in your installation. Light the appliance

and allow it to burn for 20 minutes. See Flame Color and Behavior on

Page 21 to determine if you have a proper burner ﬂame appearance. If

the proper ﬂame appearance cannot be achieved, the ﬂue restrictor may

need to be set to a different position. See the following guidelines to

determine if you need to readjust the ﬂue restrictors.

Before proceeding, conﬁrm the manifold and inlet gas pressure is correct,

primary air shutter is properly adjusted, venting system connections are

secure and not blocked and if you are at a high elevation, ensure unit has

been properly derated:

Symptoms - Lack of Combustion Air

If the symptoms listed below are present, you may need to adjust the

ﬂue restrictor to a more open position.

• Flame appears yellow

• Floating Flames (lazy, ill deﬁned, quiet, may roll)

• Sooting

• Pilot becomes yellow and appliance shuts down

Symptoms - Excessive Combustion Air

If the symptoms listed below are present, you may need to adjust the

ﬂue restrictor to a more closed position.

• Low Flame

• Pilot pulls and appliance shuts down

• Pilot ﬂame ghosts

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