Installation

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
24
VARIABLE LENGTH
1. The variable length (LV) is used only to make odd lengths, it doesn’t
compensate thermal expansion. See figure 65 for typical location.
2. The variable length assembly includes a sliding flanged female cou-
pling, a flanged retaining band, a locking band, a insulation band and
split outer casing. Inner flue sealant S-2000 or S-650 is necessary
depending on the flue gas temperature.
3. Installation steps :
a. Measure the distance required for the variable length. See figure
59.
b. Cut the inner wall at the dimension found at point ‘a.’ plus 1”.
Cut the split outer casing at dimension plus 5/8”. Then cut the
insulation band at dimension (DIS only). See figure 60.
c. Install the interior assembly between the two parts. Put one
bead of sealant between the couplings flanges as a regular length
installation. See figure 61.
d. Slide down the female coupling over the male coupling of down-
stream part and fill the gap between the female coupling and the
inner wall with S-2000 or S-650 sealant. See figure 62.
e. Slide down the retaining band to the female coupling to mate
their flanges and tighten the band. Then, install the locking band
over those flanges. See figure 63.
f. Install the insulation over the inner wall (DIS only). See figure
64.
Figure 59-
Variable length, Installation step A
Figure 60 - Variable length, Installation step B
Figure 64 - Variable length, Installation step F
Figure 65 - Variable length, Installation step G
Figure 61 - Variable length, Installation step C
Figure 62 - Variable length, Installation step D
Figure 63 - Variable length, Installation step E
Slide down the female coupling
and fill the gap with sealant
Slide down the retaining band and
tighten the band and install the locking
band over the flanges
Install the insulation (DIS only)
Distance X
Cut to X + 1”
Cut to
X + 5/8”
Cut to X
(DIS only)
Cut 1.25” in the bend to
clear the locking band
Install interior assembly
between two parts
Install the outer shell by inserting
the crimped end under the male
coupling first
Tighten the bolts
and install the
locking bands