SBD SERIES SELECTION TABLE

NOTES:

1. Use Total Static Pressure column that will overcome total system resistance. Approximate pressure drop for component and accessory items, burner 112", filter (dirty) 1/4", intake hood 1/8", birdscreen 1/8", discharge louver 1/8". Damper resistance may be ignored.

2. Refer to fan curves in bulletin SB-1 for blower RPM and brake horsepower.

3. NA - Not Available, CHO Contact Home Office.

4. 50 to 1 Turndown available - CHO

Selection Procedure :

1 . Choose either SBD system for 100% outside air or SBDR system for return air capability.

2. Determine required model size from selection table with desired SCFM of make-up air and MBH input or air temperature rise in °F. Please note that:

Air temp rise = (920 x MBH Input) / (1.08 x SCFM)

3. For model size selected, read required motor horsepower to overcome total static pressure resistance. Approximate static pressure losses for component and accessory items are: burner 112", filter (dirty) 1/4', intake hood 1/8', discharge louver 1/8". Damper resistance may be ignored.

Also specify type of gas and gas pressure, mounting location, blower discharge arrangement and motor electric characteristics.

Example:

Select a direct gas-fired heating system to heat 18,000 SCFM of 100% outside air with an air temperature rise of 90°F. Total static pressure required is 1.75° w.c. Unit to be rooftop mounted with down discharge through root, and furnished with throw-away filters and intake hood, Fuel is natural gas at 1 PSIG inlet pressure.

1. SBD system is chosen for 100% outside air.

2. At 18,000 SCFM and 90'F temperature rise, select model size 218. Heat input will be 1,902 MBH.

3. For size 218 with 1.75" w.c. total static pressure, selection table indicates that a 15 HP motor is required.

Selection is thus complete:

Model SBD-218-18-1902 with 15 HP motor. Unit to be natural gas fired with 1 PSIG pressure, rooftop mounted, weatherproofed, HR-2 blower arrangement, 230/60/3 power, and furnished with 2" throwaway filters and intake hood.

MODEL DESIGNATION

REMOTE CONTROL STATION

Remote control station with switches and indicating lights is standard  with SBD and SBDF direct gas-fired make-up air systems. The panel shown is typical for SBD two speed size unit. Front panel and wiring will change according to items furnished.

Standard remote control station is 8 inches high, 5 inches wide and 3-1/2 inches deep with stainless panel. A flush mounted panel is available as an optional item.

GAS MANIFOLD SIZE

Based on standard 10" inlet gas pressure (Above 6900 MBH - C.H.O.)