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  Hastings Industries Inc.   Direct Gas Heating  

Direct Gas Heating Systems - Page 8

   

Direct Gas Heating

SBD SERIES SELECTION TABLE


Model
Air Delivery
-
SCFM
Outlet Velocity
-
FPM
Approx Shipping Weight
-
Lbs
MBH Input Motor Horsepower
Air Temperature Rise Total Static Pressure
(Refer to Notes Below)
40 50 60 70 80 90 100 110 120 3/4" 1" 1-1/4" 1-1/2" 1-3/4" 2" 2-1/2"
SBD
233
40000 1888 5100 1878 2348 2817 3287 3757 4226 4696 5165 5635 15 15 20 20 20 25 30
45000 2124 5100 2113 2641 3170 3698 4226 4754 5283 5811 6339 15 20 20 25 25 30 40
50000 2360 5140 2348 2935 3522 4109 4696 5283 5870 6457 7043 20 25 25 30 30 40 40
55000 2596 5200 2583 3228 3874 4520 5165 5811 6457 7102 7748 25 30 30 40 40 40 50
60000 2832 5235 2817 3522 4226 4930 5635 6339 7043 7748 8452 30 40 40 40 40 50 50
65000 3067 5330 3052 3815 4578 5341 6104 6867 7630 8393 9157 40 40 40 50 50 50 60
70000 3303 5330 3287 4109 4930 5752 6574 7396 8217 9039 9861 40 50 50 50 60 60 CHO
75000 3539 5380 3522 4402 5283 6163 7043 7924 8804 9685 10565 50 60 60 60 CHO CHO NA
SBD 240 70000 2300 6960 3287 4109 4930 5752 6574 7396 8217 9039 9812 25 25 30 40 40 40 CHO
80000 2630 7010 3757 4696 5635 6574 7513 8452 9391 10330 11270 30 40 40 40 so 50 60
90000 2960 7100 4226 5283 6339 7396 8452 9509 10565 11739 12678 40 40 50 50 60 60 CHO
100000 3290 7150 4696 5870 7043 8217 9391 10565 11739 12913 14087 50 60 60 60 75 75 CHO
110000 3620 7250 5165 6457 7748 9039 10330 11622 12913 14204 154961 60 75 75 75 100 100 CHO
120000 3950  7325 5635 7043 8452 9861 112701 12678 14087 15496 16904 75 100 100 100 CHO CHO CHO

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

dgas08b.GIF (5037 bytes)

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.)

Manifold Size NPT Maximum MBH Input - Natural Gas
Spectra Modulation Spectra W/IRI or FM
1" 1000 940
1-1/4" 1410 1255
1-1/2" 2170 1860
2" 3420 3060
2-1/2" 5200 4470
3" 6900 5840



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