Schwank STSp-WP - Manual (Page 18)

SP-MSWP-BX-09A
STSp-WP Manual
RD: MAY 2004
RL: 9
KH
11. FLUE VENTING
The STSp-Wp series is approved for both
direct vented and indirect vented applica-
tions.
INDIRECT VENTED APPLICATION
DIRECT VENTED APPLICATION
NOTE:
When the heater is installed and indirectly
vented, it is required in Canada that the
heater be electrically interlocked to an
independent exhaust fan by means of an Air
Proving Switch. The exhaust fan must be
sized to create 3CFM for every 1000 Btu/
hr or fraction thereof, of total input of
installed equipment. Consult CSA.B149.1-
00 latest edition for requirements.
In the USA when a heater is installed
unvented the system requires consideration
of normal infiltration and introduction of
outside air by natural or mechanical means,
and /or electrically interlocked to an
independant exhaust fan. Consult your local
codes and ANSI Z223.1 latest edition. to
determine the specific requirements.
All venting must be single wall "C" vent
except that portion of vent passing through a
combustible wall or roof then type "B" vent
may be used as per CSA's interim
requirement. When venting horizontally, the
flue vent system must slope downwards
approximately 1/4" per foot toward the vent
terminal, starting at the termination of the
radiant tube. For horizontal through the wall
venting, the approved Schwank 4" or 6" vent terminal should be used. Install the flue vent
terminal 18" from the outside wall to the
inside end of terminal opening. The flue vent
terminal used must be of the approved type
supplied by Schwank or supplied by an
approved "B" vent manufacturer. It is the
responsibility of the installer to be familiar
and current with local codes or ANSI
Z223.1 / CSA.B149.1-00 latest editions for
all venting requirements, and practices.
The system must not be operated in a
negative air condition, unless combustion
air is brought in from outside directly to
the burner. If a severe negative pressure
is experienced or anticipated, order
heater requesting custom Air Switch c/w
Air Hose from Schwank.
* Ensuring you specify the correct heater
model number when ordering.
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