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Indication of back firing:
Loud ignition noise, followed by distinct hissing sound.
Little or no visible burning on the ceramic tile surface.
Combustion is taking place inside the burner body.
WARNING:
If heater backfires during operation, it must be turned off immediately.
Cause & remedy of back firing:
Improper gas pressure entering the venturi tube: check gas supply pressure.
Damage of a ceramic tile and or gasket: - replace damaged part.
Faulty sealing of the ceramic tile to the burner body, caused by damaged gasket material:
contact your local distributor or contractor.
14. VENTILATION REQUIREMENTS FOR INDOOR APPLICATION
WARNING
lation must be in accordance with all local, state, provincial, and national codes
(ANSI Z223.1/NFPA 54 in USA; B149.1 in Canada).
This heater is approved for unvented (indirect venting) application. Ensure that there is ade-
quate ventilation to supply combustion air and to dilute the products of combustion in accord-
ance with all local, state, provincial, and national codes. A balanced exhaust / inlet air system
is required to ensure that a negative air condition is not created. See below for a summary of
exhaust capacity requirements by the national codes in the U.S.A. and Canada.
Air Supply: A "loose" building may not require any additional air supply if infiltration rates are
sufficient to offset exhaust volume. However, for "tighter" buildings, or if air movement is stag-
nant in an area, air can typically be supplied via inlet(s) with an area of 1 sq. in. per 1,000 Btuh
input (22 sq cm per kW). Locate air inlet(s) up at the level of the heaters to avoid cold drafts at
work level, and effectively supply combustion and dilution air to the heaters and balance the
system.
Heater Zoning: Exhausters are sized according to the input requirements of each con-
trolled zone of heaters. Multiple smaller zones are usually more effective in both comfort and
ventilation control than one large zone. Maximum zone size is limited by the total input that can
be handled by the capacity of an exhauster, and by the proximity of the exhauster to heaters in
the zone.
Exhauster Location & Proximity: Exhaust must be located as high as practicable in the
structure above the level of the heater(s) to effectively dilute and remove the warm (rising)
products of combustion. The exhauster should be as centrally located as practicable in the
zone of heaters. Schwank recommends a maximum 6:1 ratio of the horizontal distance be-
tween the exhauster and the furthest heater in a zone, to the height the heaters are mounted
above the floor . For example, if heaters are mounted 20 ft above the floor, then the exhaust
Inadequate venting of a heater may result in asphyxiation, car-
bon monoxide poisoning, injury or death. Heating system venti-
24
888-Warm-Glo
2100 / IO 100 Manual
IM110107
RD: SEPT 2016
R.L. 7
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