Schwank IT(U) - Manual (Page 19)

GP-MSEM-BX-06A
SEM(U) / IT(U) Manual
RD: Aug 2006
RL: 06A
KH
The heater is designed to operate with single
wall 4” diameter 26 gauge minimum exhaust
vent.
When venting horizontally, the flue vent sys-
tem should slope downwards approximately
1/4" per foot toward the vent terminal, start- ing at the termination of the radiant tube.
When vent and combustion air are taken
through the roof, the exhaust vent should al-
ways terminate higher than the combustion
air intake, to prevent recycling the products
of combustion back into the heater.
The total maximum allowable combined
length of vent and combustion air duct is 80'
for SEM / IT 200, 175, 155 and 130, and 50'
for SEM / IT 110, 100, 80, 60 and 45. Total
maximum allowable combined vent and duct
is reduced by ten feet for every 90
o
elbow in-
stalled in the vent or duct. Should the tube
system be installed with a 90
o
elbow in the
radiant tube, 10 ft must be deducted from the
length of vent and duct. Should the tube sys-
tem be installed with a 180
o
elbow or an SEM
(U) / IT(U) turn box in the radiant tube, 20 ft
must be deducted from the length of vent and
duct. Neither the individual flue vent nor the
combustion air duct is to exceed 50 ft in
length. Exceeding the allowable lengths may
create condensation problems and will void
CSA Design Certification.
The horizontal flue vent shall not terminate
less than:
• One foot above grade level, unless its lo-
cation is adjacent to public walkways,
then it has to be not less than seven feet.
• Must be installed to prevent blockage by
snow and protect building materials from
degradation by flue gases.
• Directly below a soffit or over- hang.
• Directly above a gas utility meter or ser-
vice regulator.
• Twelve inches from combustion air inlet
of any heater with input up to 100,000
Btu/hr.
• Three feet from combustion air inlet of
any heater over 100,000 BTU.
• Within six feet of a mechanical air supply
inlet to any building.
• Twelve inches from sides and bottom and
eighteen inches from top when installed
close to the corner of a building.
• All vent pipe with a slip fit connection
must be mechanically secured. A length
of ‘C’ Vent is to be installed on the
swaged end of the last tube before any
Tee is fitted.
• As an Option, two heaters may be vented
through an approved common 4"x4"x6"
Vent Tee, supplied by the manufacturer.
The two heaters must then be controlled
by a single common thermostat or “ON/
OFF” switch.
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