Space Ray RSCA Series - Manual (Page 14)

Form #43219000
Sept 2012
E. TYPICAL THERMOSTAT WIRING INSTALLATIONS FOR STANDING PILOT (N1 OR L1 CONTROL)
IGNITION SYSTEM
12) VENTILATION
Where unvented infrared heaters are used, natural or mechanical means shall be provided to supply and
exhaust at least 4 cfm per 1000 Btu per hr input of installed heaters.
Exhaust openings for removing flue products shall be above the level of the heaters.
This heater requires ventilation in the building to dilute the product of combustion and provide fresh air for
efficient combustion. Power ventilation is recommended, and the minimum vent flow required is as follows:
RSCA3 = 109 cfm RSCA6 = 218 cfm RSCA10 = 436 cfm
If gravity ventilation is used, the required square feet of inlet and outlet vent area (depending on height and
temperature difference) is as follows:
RSCA3 = 0.4 s/f RSCA6 = 0.8 s/f RSCA10 = 1.6 s/f
The General Ventilation Rules outlined in ASHRAE GUIDE AND DATA BOOK should be observed when locating
vents. Exhaust vents must be located at the highest point above and in the vicinity of the heaters and the
inlet vents must be located below the level of the heaters. Inlet openings in the building should be well
distributed high in the sidewalls and should direct incoming air upward to dilute products of combustion
while preventing drafts at lower levels. Inlets are typically 1 to 3 sq. ft. Local codes may require that
mechanical exhaust systems be interlocked with the function simultaneously or allow control of exhausters
to humidistat.
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