Operating instructions

1,
,
3,
,
5,
Theseboilers may be vented horizontally as shown in
Figure 10.The vent pipe is pitched down from the boiler to
the vent termination. Do not connect other appliances to this
vent.
Vent Pipe Material:
A. UL ListedZ-FlexZ-Vent stainlesssteelvent pipe from
boiler to vent termination,
-or-
B. UL ListedHeat-FabSaf-T-Ventstainless steelvent pipe
from boiler to vent termination,
-or-
C. UL ListedFlex-LStaR-34stainless steelvent pipe from
boiler to vent termination,
-or-
D. UL ListedProTech FasNSealstainlesssteel vent pipe from
boiler to vent termination.
Clearanceto Combustible Materials: Forstainless steelvent
pipe maintain 6" minimum air space clearanceto combustible
materials.
Vent Pipe Size:
A. 2, 3, 4 and 5 section boilers use 3" vent pipe connected
directly to the outlet of the induced draft blower.
B.
6 and 7 section boilers use 4" vent pipe, starting with a3"
to 4" stainless steelvent pipe transition that is connected
directlyto the outlet of the induced draft blower. Do not
use 3" vent pipe on 6 or 7 section boilers.
Vent Pipe Length:
A. For stainlesssteel vent pipe,the maximum horizontal vent
length is 30feet plus one 90°elbowplus termination fitting.
6,
Vent Termination Fitting: For allvent pipe materials, you may
use either:
A. A 90° elbow pointing down, fitted with a minimum 114"
mesh screen to keep out rodents and birds. Theelbow shall
be of the same material and sizeas vent pipe. The elbow
exit shouldbe at least 6" awayfrom exterior wall as shown
in Figure 10.
B.
-0r-
Tjernlund VH-1Series sidewall vent hood. For 2,3, 4, 5
section boilers use VH-1-3",For 6, 7 section boilers use
VH-1-4".
7. Vent PipeTermination Location (Figure 10):
a.
When venting through combustible walls,combustible
clearancesmust be considered. TheVH-1 Sidewallvent
hood provides both the outside vent termination and a
double wallpipe for passing through a combustiblewall
up to 8" thick (VH-1-4") or 9" thick (VH-1-3").Thehole
in the wall must be 61_'' square for 3"vent pipe and 7 1/2"
square for 4" vent pipe, in order to insert the VH-1 side
wall vent hood. The VH-1may also be used in noncombus-
tible walls.
B.
Ifthe 90° elbow isthe termination fitting of choice,then
the singlewall pipe willbe passingthrough the sidewall.
For combustiblewalls, a ULlisted thimble shall be used
where the singlewallpipe passesthrough the wall.For
combustiblewalls usingZ-Vent, Saf-T-Vent,or StaR-34
vent pipe, use the following:
• 3" vent pipe - use Simpson's Duravent 3" thimble
•4" vent pipe - use Simpson's Duravent 4" thimble. Maxi-
mum wall thickness with this thimble is 7 inches.
B.
C.
Minimum horizontal vent length for all vent materials is 2
feetplus one 90° elbowplus termination fitting.
For additional elbowsreduce the maximum vent length as
shown:
•3" - 90° elbow - reduce vent length 3 feet per each 3" elbow
•4" - 90° elbow - reduce vent length 6 feet per each 4" elbow
For combustiblewallsusing ProTechFasNSealwhere the singlewall
vent pipe must pass through the side wall,a UL ListedFasNSealwall
thimble shallbe used.
Thethimble isadjustable for differentwall thickness,with amaxi-
mum wallthickness of 7 inches. Sealthe thimble along the outside
edgeof the platewith caulkor siliconeand fasten to the wall with
screwsor nails.
Example: 6 section boiler has 3 elbows plus the termination fitting.
This means 2 additional 4" elbows will be used, at 6 feet per elbow.
This is equivalent to 12 feet of pipe (2 x 6 =12), therefore maximum
vent length is now 18 feet (30 -12 =18).
C. For singlewallpipe through non-combustible walls, the
hole through the wallneed onlybe large enough to main-
tain the pitch of the vent pipe, and provide proper seal-
ing. A thimble isnot required for singlewall pipe passing
through noncombustible walls.
D. Theventing systemshall terminate at least 3 feet above