Schwank SEB(U) - Manual (Page 17)

SP-MSEB-BX-10A
SEB Manual
RD: JUNE 2004
RL: 10
KH
Page 13
If drawing in fresh air from outside, it is rec-
ommended as per common Engineering prac-
tice, that the combustion air intake duct be
insulated. Do not use flexible dryer hose for
air inlet duct. The corrugated sides of this
tubing add too much restriction to the air
flow.
The air intake inlet shall not be located
less than the following distances:
• Three feet above grade
• Twelve inches from flue vent terminal of
any heaters with input up to 100,000 BTU
• Three feet from flue vent terminal of
any heaters over 100,000 Btu/hr.
In installations where:
Chlorinated Hydrocarbons are in
use, such as Trichloroethylene or
Chloroethylene Nu, it is essential
that combustion air be brought in
CAUTION:
from non-contaminated areas.
Burning the fumes from these gases
will create Hydrochloric Acid fumes,
which are detrimental to humans,
equipment and buildings.
11. COMBUSTION AIR INTAKE DUCT
Where heater is operated in a negative air
condition or in contaminated air atmosphere
such as woodworking shops, air for
combustion must be ducted from outside to
optional intake flange on blower. The total
maximum length of vent and combustion air duct is 80' for SEB / SEBU 200, 175,
155 and 130, and 50' for SEB/SEBU 110, 80
and 60. Neither the flue vent or combustion
air duct is to exceed 50'. The total maximum
vent allowable is reduced by ten feet for
every 90
o vent elbow installed.
Order Optional Parts:
Air Intake Flange: Heater Model Required
Air Intake Vent Cap: JS-0532-VC
12. GAS SUPPLY INSTALLATION
• To ensure proper performance and full
input capacity, the gas line should be
properly and adequately sized.
• Installation of a manual shut off valve is
required on the gas supply line inlet to the
heater.
• All components upstream of the control
valve are field supplied by the installer.
• Installation of a pipe joint union is re-
quired at the gas inlet connection to the
control valve on the heater. (It is
recommended that the approved flexible
gas connector supplied by Schwank be
installed between the heater and the gas
piping).
• Installation of a gas line “Drip Leg” is
required at the inlet connection to heater.
• Heater must be isolated from the gas sup-
ply piping system by closing its individ-
ual manual shutoff valve, supplied by the
installer, during any pressure testing of
the gas supply piping system in excess of
1/2 psig.