Standard Equipment
General :
Either of two horizontal blower arrangements
are available as HR-1, horizontal discharge and HR-2,down discharge as illustrated below
Blower :
Centrifugal forward curved,double width
,double inlet,class 1 fan(s) with solid turned ground shaft and self
aligning,200,000 hour lubricatable ball bearings.All blower wheels are statically and
dynamically balanced.
Blower housings,bearings and adjustable motor
base are mounted on a reinforced frame to insure rigidity and quiet operation .Adjustable
drives are standard through 10 HP,fixed drives with 15 HP and larger motors V-belts drives
are sized for 135% if motor horsepower.
Fan motors and drives are mounted within the
blower cabinet.This affords motor protection and eliminates the operation hazard of V-bell
drives external to the unit.
Cabinet :
Bolted construction aluminized steel;
SB-112/115 of 18 gauge,SBD215/218 of gauge, SBD222/227/233 with 16 gauge sides and 14
gauge top, and SBD-240 with 14 gauge cabinet. Access panels are provided to allow easy
access to motors,drives and filters (if ordered). Outside surface is primed with
zinc-chromate and finished with a coat of enamel.
Motor :
Energy Efficient(E.E.),T-frame, open drip-
proof,1800 RPM prelubricated ball bearing type for all standard voltages.
Burner :
Direct gas-fired line burner with spark
ignited intermittent pilot for natural gas at inlet pressures from 6 oz. through 1 PSIG
with up to 25:1 turn down ratio.
Gas and Electric
Controls :
Main gas hand shut-off valve.
Main and pilot gas pressure regulators.
Pilot controls.
Electric safety shut-off valve.
Self-contained gas modulating valve for
units with burner capacity of 500 MBH or less.
Electronic modulating gas valve with
temperature controller for units with burner capacity above 500 MBH(Series 14 Selectra).
Electronics flame safeguard system.
High temperature limit switch.
Airflow switch.
Ignition transformer.
Automatic mild weather burner lockout.
Motor starter.
Control transformer.
NEMA 1 control box.
Remote control stations with system switches
and indicating lights.
SAFETY AND LIMIT
CONTROLS OF SBD SYSTEMS
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