Fives North American Gas/Air Ratio Regulator 7216-1
7216 Variable Ratio Regulators are used with nozzle-mix burners to
achieve temperature uniformity while using minimum excess air. Molded
diaphragms ensure excellent tracking and repeatability, maximum flows, and superior turndown. A high quality stainless steel spring is used to bias 7216 Regulator air/gas ratio. As air rate is turned down towards low fire, gas rate drops faster, giving increasing percentages of excess air (see Figure 2). Reduced total air means greater fuel economy.
Inlet pressure : Max 2PSI
Maximum : 5 psi
outlet pressure : 0.2-119 mbar
connections : 1″
Adjustment. Regulators are set at zero bias as shipped. To
set regulator bias, loosen locknut at base of spring cartridge,
turn spring cartridge counterclockwise (do not remove cap),
and retighten locknut. Set as negative as necessary to get
temperature uniformity at low fi re.
Where available gas pressure at the 7216 inlet is less than 2
osi above maximum combustion air pressure, use a bleeder in
the air impulse line. See Bulletin 8654 or Instructions 7218-2.
If 1:1 ratio control is required at all fi ring rates, a 7218 Ratio
Regulator is recommended, rather than a 7216. In some
multi-purpose furnaces, 7216 and 7218 Regulators are piped
in parallel with an isolation shutoff valve ahead of each. This
permits holding constant ratio from high fi re to low using the
7218, or variable ratio operation with the 7216.
รีวิว
ยังไม่มีบทวิจารณ์