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