Warm. SDFI Direct Fired Gas Heating System. Sterling. Keeps You. Technical Guide for: Indoor Mounted Units To 64,000 CFM And 9M BTUH

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1 TGSDFI- SDFI Direct Fired Gas Heating System Technical Guide for: Indoor Mounted Units To 64,000 CFM And 9M BTUH Sterling Keeps You Warm Featuring the Patented AirTrak controlled Air Circulation System

2 SDFI Direct Fired Gas Heating System Technical Guide In the business of commercial and industrial operations, efficient and low-cost heating is essential. Sterling keeps you warm for less. Since 1946, Sterling has been providing cost-effective, reliable gas heating solutions. Our proven Direct Fired Gas Heating System adds warm, fresh and clean air to your work environment for greater comfort and productivity. This Technical Guide will help you choose a Sterling Direct Fired Gas Heating System to provide efficient, cost-effective heating for your warehouse, factory or process operation. The Guide covers: Technical Specifications Configure the right system components (e.g., burner, motors, drive, filter, options, etc.) to meet your needs. Installation Information Plan details of on-site installation with dimensional information and cabinet arrangement diagrams. If you have questions, please contact Sterling s Customer Service Department at We ll be glad to help. To add evaporative cooling, refer to the Sterling SDFE Evaporative Cooling System brochure. Sterling Keeps You Warm In the interest of product improvement, Sterling reserves the right to make changes without notice.

3 Table of Contents Air Delivery Tables Burner Performance Table Dimensions Horizontal Units Vertical Units Return Air Sections... 1 Filter Banks... 1 Inlet Dampers Discharge Louvers... Fixed and Revolving Discharge Options Control Systems Amp Draw Table... Sequence of Operation... Typical Gas Piping Layout... 4 Cabinet Arrangements... Unit Weights... 6 Guide Specification Basic Unit... 7 Guide Specification Mixing Dampers With Return Air Flow System... 8 Guide Specification BACview or Touchscreen Controller... 9

4 Air Delivery Table Blower HP Selection Unit Model CFM Std ,000,00 11,000 11,000 1,000 1,000 14,000,000 14,000,000 16,000 18,000,000,000 4,000 6,000 8,000 0,000 FPM Outlet Velocity / 4 HP / 1 1 / / 8 HP / 1 / HP / 1 1 / Total External Static Pressure (W.C.) / 4 1 HP HP / 1 1 / 1 1 / 1 1 / 4 HP 1 1 / 1 1 / HP HP 0 NOTE: The horsepower selections are based on system external static pressure. One or more of the following must be added when applicable. A. Motor Operated Inlet Damper.1 W.C. B. V-Bank Filter Section. W.C. C. Discharge Louver.1 W.C. D. F or R Discharge pg E. 8F or 8R Discharge pg - SELECTION GUIDE 1. Determine the required amount of replacement air (CFM) by computing the total amount of air being exhausted. (Restaurants should be sized for 90% of exhaust air to minimize food odors.). Determine the total external static pressure by adding the pressure drops through all accessories and ducts.. Select unit sizes and motor horsepower from table. 4

5 Air Delivery Table Blower HP Selection Unit Model 18 CFM Std ,000,00 11,000 11,00 1,000 1,00 1,000 14,000,000 16,000 17,000 18,000 19,000,000 1,000,000,000 4,000,000 6,000,000 6,000 7,000 8,000 9,000 0,000 1,000 0,000,000 4,000 6,000 8,000,000 4,000 44,000 46,000 44,000 48,000,000 6,000,000 64,000 FPM Outlet Velocity / 4 HP 0 0 / 8 HP / HP Total External Static Pressure (W.C.) / 4 1 HP HP 7 1 / 7 1 / 7 1 / 7 1 / 7 1 / 7 1 / 7 1 / 7 1 / 7 1 / 7 1 / / 4 HP / HP HP

6 Burner Performance Table Single Blower Models Unit Model CFM Std ,000,00 11,000 11,000 1,000 1,000 14,000,000 14,000,000 16,000 17,000 18,000,000,000 4,000 6,000 8,000 0, RISE RISE RISE RISE RISE RISE RISE SELECTION GUIDE 1. Determine the temperature rise required through the heater by subtracting the winter design temperature from the desired indoor temperature.. Values shown in above MBH Input Tables are based on - F Inlet Temperature. MBH input shown on unit rating plate will be corrected for actual air density.. Natural gas units are limited to F temperature rise, propane units are limited to 0 F temperature rise. 6

7 7 0 RISE RISE Twin Blower Models Burner Performance Table 1 RISE RISE RISE CFM Std. 70 Unit Model 70 RISE ,000,00 11,000 11,00 1,000 1,000 14,000,000 16,000 17,000 18,000 19,000,000 1,000,000,000 4,000,000 6,000,000 6,000 7,000 8,000 9,000 0,000 1,000 0,000,000 4,000 6,000 8,000,000 4,000 44,000 46,000 44,000 48,000,000 6,000,000 64,000 RISE

8 Dimensions Single Blower Models Horizontal Units C000498A UNIT COMPONENTS 1. Inlet Damper. R/A section (before burner). V-bank 4. Burner section. R/A section (after burner) 6. Blower section 7. Filter access 8. Adjustable profile 9. Control cabinet. Access door (piping compartment) 11. Gas piping manifold 1. R/A access 1. Return air damper 14. Belt guard. Return air flow station (required for ETL listed Return Air Unit) S/A R/A S/A S/A S/A O/A R/A Model A / / B C 4 4 D 1 / 4 18 / / 8 7 / 8 1 / / 8 E 1 / 1 / / 8 7 / 8 1 / / 8 F 16 1 / 14 / / / 17 9 / / 16 / / 16 Dimensions H J 8 1 / / / / / / 4 1 / 4 1 / 4 K L 4 / 4 4 / 4 9 / 4 9 / 4 48 / 4 48 / 4 48 / 4 48 / 4 M N 1 / 8 1 / 8 1 / 4 1 / / / / / 8 P 4 1 / 4 1 / 1 / 1 / 49 1 / 49 1 / 61 1 / 61 1 / 8 NOTE: All dimensions in inches subject to manufacturing tolerances.

9 Dimensions Twin Blower Models Horizontal Units C000497A 4. Burner section. R/A section (after burner) 6. Blower section 7. Filter access 8. Adjustable profile 14. Belt guard. Return air flow station (Required for ETL listed Return Air Unit) UNIT COMPONENTS 1. Inlet damper. R/A section (before burner). V-bank 9. Control cabinet. Access door (piping compartment) 11. Gas piping manifold 1. R/A access 1. Return air damper S/A S/A R/A S/A S/A S/A O/A R/A Model 18 A 7 1 / / B C 4 4 D 18 / / 8 7 / 8 1 / / 8 E / 8 7 / 8 1 / / 8 F 16 1 / 1 1 / 4 1 / 4 17 / 4 1 / 4 18 / 8 Dimensions G 1 / 1 / 9 / 8 9 / 8 7 / 8 H J 14 1 / / 4 1 / 4 1 / 4 K 4 4 L 9 / 4 9 / 4 48 / 4 48 / 4 48 / 4 48 / 4 M N 1 / 4 1 / / / / / 8 P 8 1 / 8 1 / 9 1 / 9 1 / 1 / 8 1 / 8 NOTE: All dimensions in inches subject to manufacturing tolerances. 9

10 Dimensions Single Blower Models Vertical Units C00000A UNIT COMPONENTS 1. Inlet Damper. R/A section (before burner). V-bank 4. Burner section. R/A section (after burner) 6. Blower section 7. Filter access 8. Adjustable profile 9. Control cabinet. Access door 11. Gas piping manifold 1. R/A access 1. Return air damper 14. Belt guard. Return air flow station (Required for ETL listed Return Air Unit) 16. Screen S/A S/A S/A R/A R/A O/A Model A / / B C 4 4 D 1 / 4 18 / / 8 7 / 8 1 / / 8 E 1 / 1 / / 8 7 / 8 1 / / 8 F 16 1 / 14 / / / 17 9 / / 16 / / 16 H Dimensions J K 8 1 / / / / / / 4 1 / 4 1 / 4 L 4 / 4 4 / 4 9 / 4 9 / 4 48 / 4 48 / 4 48 / 4 48 / 4 M N 1 / 8 1 / 8 1 / 4 1 / / / / / 8 P 4 1 / 4 1 / 1 / 1 / 49 1 / 49 1 / 61 1 / 61 1 / Q R S 17 1 / / / NOTE: All dimensions in inches subject to manufacturing tolerances.

11 Dimensions Twin Blower Models Vertical Units C000499A. R/A section (after burner) 6. Blower section 7. Filter access 8. Adjustable profile 9. Control cabinet. Access door UNIT COMPONENTS 1. Inlet damper. R/A section (before burner). V-bank 4. Burner section 11. Gas piping manifold 1. R/A access 1. R/A air damper 14. Belt guard. Return air flow station (Required for ETL listed Return Air Unit) 16. Screen S/A S/A S/A S/A R/A R/A O/A Model 18 A 7 1 / / B C 4 4 D 18 / / 8 7 / 8 1 / / 8 E / 8 7 / 8 1 / / 8 F 16 1 / 1 1 / 4 1 / 4 17 / 4 1 / 4 18 / 8 G 1 / 1 / 9 / 8 9 / 8 7 / 8 H Dimensions J 14 1 / / 4 1 / 4 1 / 4 K 4 4 L 9 / 4 9 / 4 48 / 4 48 / 4 48 / 4 48 / 4 M N 1 / 4 1 / / / / / 8 P 8 1 / 8 1 / 9 1 / 9 1 / 1 / 8 1 / 8 Q R S 18 1 / 1 / / 4 / 4 NOTE: All dimensions in inches subject to manufacturing tolerances. 11

12 Dimensions Return Air Section C0000 Dimension A B C D E / / / / 4 1 / / / MODEL / / / / / / / / 8 1 / 8 1 R/A Opening Size Model Before Burner After Burner / 4 x / 4 x 0 NOTE: R/A openings shall be centered on floor. NOTE: All dimensions in inches subject to manufacturing tolerances / 4 x 14 1 / 4 x / 4 x / 4 x / 4 x 61 1 / 4 x / 4 x 8 x / 4 x / 4 x / 4 x 1 1 / 4 x 1

13 Filter Dimensions V-Bank Filter and Filter Information C0000 Dimension A B / MODEL / Model V-Bank Filter Qty. & Size 9-11 (4) x x (9) 16 x x NOTE: All dimensions in inches subject to manufacturing tolerances. 1-1 () x x 1- (4) 16 x x -18 (18) x x - () 16 x x - (4) x x 1

14 Dimensions Inlet Damper C00001A INLET DAMPER Dimension A B / 4 1 NOTE: All dimensions in inches subject to manufacturing tolerances Model /

15 Dimensions Discharge Louvers C00001B Dimension A B C / / 16 NOTE: All dimensions in inches subject to manufacturing tolerances / 1 1 / 4 Model / 8 / / 8 70 / / / / 8 / 4

16 Discharge Options F and R Discharge Dimensions and Weights C

17 Discharge Options F and R Discharge Dimensions and Weights Model Size Discharge Size DISCHARGE DIMENSIONS AND WEIGHT F and R Discharge D L W Weight F Weight R / 9-1/4-1/ / / / / 16-/ / 18-1/ / -1/8 66-1/ / 66-1/ / 66-1/ / 18-1/ / -1/8 66-1/ / 66-1/ / 66-1/ / 66-1/ 1 4 NOTES: 1. All dimensions are in inches.. All weights are in pounds. 17

18 Discharge Options F and R Discharge Pressure Drop and Coverage Model SCFM Discharge Size Air Pressure Drop Mounting Height Fixed Coverage Revolving Coverage x 8 8 x x x x 6 6 x x x x x x 7 7 x x x x x x x x x x x x x x x x x x 9 9 x x x x 1 1 x x x x 9 9 x x 9 9 x x 0 0 x x 7 7 x x 1 1 x x 1 1 x x 1 1 x x 1 1 x x x x x x 1 1 x x x x 1 1 x x x x 1 1 x x x x 1 1 x x x x x x x x 0 0 x 0 18

19 Discharge Options F and R Discharge Pressure Drop and Coverage Model SCFM Discharge Size Air Pressure Drop Mounting Height Fixed Coverage Revolving Coverage x x x x x x x x x x x 1 1 x x 1 1 x x x x x x x x x x 1 1 x x 1 1 x x x x x x x x 0 0 x x x x 7 7 x x 1 1 x x x x 1 1 x x x x x x x x x x x x x x x x x x x x x x x x x

20 Discharge Options 8F and 8R Discharge Dimensions and Weights C00078

21 Discharge Options 8F and 8R Discharge Dimensions and Weights Model Size Discharge Size DISCHARGE DIMENSIONS AND WEIGHT 8F and 8R Discharge D8 L8 W8 Weight 8F Weight 8R 9 -/ 9-7/8 47-1/ / 9-7/8 47-1/ / 1-1/ -1/ / -1/ / 47-1/ / 4-9/ / / -7/ / -7/ / 47-1/ / 4-9/ / / -7/ / -7/ / -7/ NOTES: 1. All dimensions are in inches.. All weights are in pounds. 1

22 Discharge Options 8F and 8R Discharge Pressure Drop and Coverage Model SCFM Discharge Size Air Pressure Drop Mounting Height Fixed Coverage Revolving Coverage x x x 1 1 x x x x x x x x x x x x x x 7 7 x x 7 7 x x x x x x x x x x x x x x x x 9 9 x x 9 9 x x x x 0 0 x x 4 4 x x 7 7 x x 1 1 x x 1 1 x x x x x x 1 1 x x X x x x x x x x 1 1 x x x x x x 1 1 x x x x x x 1 1 x 1

23 Discharge Options 8F and 8R Discharge Pressure Drop and Coverage Model SCFM Discharge Size Air Pressure Drop Mounting Height Fixed Coverage Revolving Coverage x x x 0 0 x x x x x x 7 7 x x 1 1 x x x x x x x x 1 1 x x x x x x 1 1 x X x x x x x x x x x x 1 1 x x x X x X X X x x X x x x 1 1 x x x x 6 6 x x 8 8 x x 1 1 x x 7 7 x x x x x x x x x 18

24 LStat Rnet BT48 Format Gnd Rx Short Pins L Stat Hot NET + Format LStat / Rnet Port NET - Tx Jumper Selector Jumper IN- 4 V ac Power IN-7 SHIELD Batt Gain 1 Run Jumper Pot. Error Only +V - + Gnd 1 CR Thermistor/ Dry Contact IN-8 0- vdc 1 SENSE On +1V 4 GND RNCT+ RNET+ RNCT- GND 1 RNET- Communication +1V Selection Jumper IN-1 Gnd - LOCAL GND ACCESS A0- + IN- Communications Selection Gnd - INPUTS 1& EIA-48 Comm Selector GND 0V,THERM OR DRY DIP Switch A0- + BACnet over ARC 6 IN- Gnd - AO: BAUD Rates SW1 SW PROTOCOLS SW1 SW 0-vdc GND ma Max. A OFF Off BACnet Off Off 19. K Off On MS/TP IN-4 8.4K On Off N On Off 76.8 K On On Modbus Off On GND INPUTS & 4 DO- THERM OR DRY CLASS DO-4 4 Vac. 0/ CYCLE Ova, 0.8A GND USE COPPER CONDUCTORS ONLY. DO- IN- INPUTS & 6 DO- THERM DRY or LStat IN-6 CAUTION: DO-1 To Reduce The Risk of Fire or Power for D.O.s BUS LED or Electrical Shock, Do Not Interconnect Outputs of BACnet Different Class Circuits Control Systems MDT Control System C0006 Application: Modulating Discharge Temperature Control Includes: Discharge air sensor mounted in unit discharge with remote mounted 4 x 4 box cover 6 including manual potentiometer to enable unit and adjust temperature setpoint, Fan On Light, Burner On Light and Cool On Light. Additional potentiometer is provided if optional return air damper section for manual or mixed air control is ordered. COMPONENT COMPONENT I.D. I.D. 1. Unit 1. DDC Unit Controller DDC Controller. Signal. Conditioner Signal Conditioner. Modulating. Modulating Gas ValveGas Valve. Discharge. Discharge Air Sensor Air Sensor 4. Inlet Air 4. Sensor Inlet Air Sensor 6. Remote 6. Control Remote Station Control Station O nes Tens Com m RNET } 1 I/O ZONE Discharge Temperature SET Here

25 BT48 NET + NET - SHIELD GND RNET+ RNET- +1V IN-1 SENSE +1V RNCT+ RNCT- GND LOCAL GND ACCESS A0- + IN- IN- GND IN-4 GND GND IN- IN-6 0 GND LED nes - INPUTS 1& 0V,THERM OR DRY INPUTS & 4 THERM OR DRY CLASS 4 Vac. 0/ CYCLE Ova, 0.8A USE COPPER CONDUCTORS ONLY. INPUTS & 6 THERM DRY or LStat CAUTION: Rx Tx Batt + CR To Reduce The Risk of Fire or or Electrical Shock, Do Not Interconnect Outputs of Different Class Circuits Communications Selection EIA-48 BACnet over ARC 6 BAUD Rates SW1 SW PROTOCOLS SW1 SW 900 OFF Off BACnet Off Off 19. K Off On MS/TP 8.4K 76.8 K On On Format Jumper Off On LStat / Rnet Port Selector Jumper N Modbus Gain 1 Jumper Communication Selection Jumper On Off Format Short Pins L Stat IN- Power Run Error Comm Selector DIP Switch Off On LStat Rnet Pot. Only Thermistor/ Dry Contact 0- vdc Power for D.O.s AO: 0-vdc ma Max. BACnet Gnd Hot 4 V ac IN-7 +V Gnd IN-8 On 4 1 Gnd Gnd A0- Gnd A0-1 DO- DO-4 DO- DO- DO-1 BUS Control Systems MRT Control System C00064 Application: Modulating Room Temperature Control Includes: Discharge air sensor mounted in unit discharge with remote mounted 4 x 4 box cover 7 including manual potentiometer to enable unit and adjust temperature setpoint, Fan On Light, Burner On Light and Cool On Light. Also includes RS-std room sensor 6 (does not allow remote room setpoint adjustment. Additional potentiometer is provided if optional return air damper section for manual or mixed air control is ordered. COMPONENT I.D. 1. Unit DDC COMPONENT Controller I.D.. Modulating Gas Valve. Discharge Air Sensor 7.. Signal Conditioner 1. Unit DDC Controller 4. Inlet Air. Sensor Modulating Gas Valve6. Room Thermostat. Discharge Air Sensor. Signal Conditioner 4. Inlet Air Sensor 6. Room Thermostat 7. Remote Control Station O Tens Com m RNET } 1 I/O ZONE Space Temperature SET Here Space Temperature SENSED Here

26 Control Systems MDT Expert Control Systems C0007 Application: Modulating Discharge Temperature Control with BACView controller allowing after hours unit enable, operating feedback, and monitoring of alarm status. Includes: Discharge air sensor mounted in unit discharge with remote mounted BACView controller to set discharge temperature setpoint and operating schedules. Service information, operating feedback, and alarm status can also be monitored. 6

27 Control Systems MRT Expert Control System C0006 Application: Modulating Room Temperature Control with BACview controller allowing after hours unit enable, room setpoint adjustment, operating feedback, monitoring of alarm status and digital temperature readout with RS-std room sensor. Includes: Discharge air sensor mounted in unit discharge with remote mounted BACview controller 7 to set space temperature, operating schedules, and optional damper control setpoints. Service information, operating feedback and alarm status can also be monitored. Also includes a RS-std room sensor 6. COMPONENT I.D. 1. Unit DDC Controller. Signal Conditioner. Modulating Gas Valve 4. Inlet Air Sensor. Discharge Air Sensor 6. Room Thermostat 7. BACView Interface 4 1 } I/O ZONE Space Temperature SET Here Space Temperature SENSED Here 7

28 Control Systems MDT Touch Control System C00077 Application: Modulating Discharge Temperature Control with Equipment Touch Touchscreen controller allowing after hours unit enable, discharge setpoint adjustment, operating feedback, monitoring of alarm status and digital temperature readout. Includes: Discharge air sensor mounted in unit discharge with remote mounted Equipment Touch Touchscreen controller 6 to set discharge temp, operating schedules, and optional damper control setpoints. Service information, operating feedback and alarm status can also be monitored. COMPONENT I.D. 1. Unit DDC Controller. Signal Conditioner. Modulating Gas Valve 4. Inlet Air Sensor. Discharge Air Sensor 6. Equipment Touch Touchscreen Interface 8

29 Control Systems MRT Touch Control System C Application: Modulating Room Temperature Control with Equipment Touch Touchscreen controller allowing after hours unit enable, room setpoint adjustment, operating feedback, monitoring of alarm status and digital temperature readout with ZS-Standard room sensor. Includes: Discharge air sensor mounted in unit discharge with remote mounted Equipment Touch Touchscreen controller 7 to set space temp, operating schedules, and optional damper control setpoints. Service information, operating feedback and alarm status can also be monitored. Also includes a ZS-Standard room sensor 6. COMPONENT I.D. 1. Unit DDC Controller. Signal Conditioner. Modulating Gas Valve 4. Inlet Air Sensor. Discharge Air Sensor 6. Room Thermostat 7. Equipment Touch Touchscreen Interface 9

30 Control Systems System 14 C Application: Non-DDC Modulating Discharge Temperature Control Includes: System 14 Amplifier compares signals from Discharge Air Sensor mounted in unit discharge and Remote Temperature Selector mounted in space. Modulating Gas Valve receives signal from amplifier and adjusts gas pressure to maintain constant discharge air temperature. 0

31 Control Systems System 44 C Application: Non-DDC Modulating Room Temperature Control Includes: System 44 Amplifier compares signals from Discharge Air Sensor mounted in unit discharge and Remote Room Thermostat mounted in space and sends signal to Modulating Gas Valve to adjust gas pressure for desired space temperature while maintaining preset minimum and maximum discharge air temperature settings. 1

32 Electrical Data DIRECT FIRED UNITS WITH RETURN AIR Amp Draw Table ITEM A ITEM A ITEM B SOURCE Blower Motor SOURCE Blower Motor SOURCE Control Transformer AMPS AMPS for 8V Ph. AMPS for V Ph. AMPS for 4V Ph. AMPS for 7V Ph. AMPS AMPS for 8V Ph. AMPS for V Ph. AMPS for 4V Ph. AMPS for 7V Ph. AMPS AMPS for 8V Ph. AMPS for V Ph. AMPS for 4V Ph. AMPS for 7V Ph Steps to size optional disconnect switch: 1. Find the blower motor HP required from tables on pages 4 and. 1 1 / MOTOR HORSEPOWER MOTOR HORSEPOWER CONTROL CIRCUIT AMPS Heating Only Unit NOTES: 1. Above motor amps are based on 11 edition of NEC Find amp draw for required motor HP from chart in Item A above.. Control circuit amps are based on standard controls.. Find amps for control circuit from chart in Item B above. 4. Add amps from step and step, multiply by 1..

33 Sequence of Operation Return Air Units DIRECT FIRED UNITS WITH RETURN AIR Sequence of Operation Return Air Units P00061 Signal from remote control I to AirTrak Controller D, sets operational parameters for dampers B and C, and burner. Damper operation can be manual, building pressure or mixed air temperature. Return air dampers B, and outside air dampers C, are interlocked to move together. As one opens, the other closes. As the return air dampers open, allowing more return air to enter the unit, the outside air dampers move toward the closed position, decreasing the amount of outside air. Pressure sensor and flow station J, senses change in return airflow and signals AirTrak Controller D. Modulating gas valve H, regulates gas supply in response to signal from AirTrak Controller D. AirTrak Controller D, varies signal based on input from room temperature sensor F, discharge temperature sensor G, and airflow sensor J. Gas valve H can provide approximately 4% to 0% of rated burner capacity.

34 Typical Gas Piping Layout Schematic Component Diagrams C COMPONENT IDENTIFICATION GP-01 HIGH GAS PRESSURE REGULATOR GP-0 MAIN GAS SHUT-OFF VALVE GP-09 PILOT GAS PRESSURE REGULATOR GP-11 MAIN TEST FIRING SHUT-OFF VALVE GP-1 PILOT GAS SHUT-OFF VALVE GP-7 ORIFICED NEEDLE VALVE VG-01 PILOT GAS VALVE VG-0 MAIN GAS VALVE VG-0 AUXILIARY GAS VALVE VG-04 NORMALLY OPEN VENT VALVE VG-07 MODULATING VALVE PS-04 LOW GAS PRESSURE SWITCH PS-07 HIGH GAS PRESSURE SWITCH PS- HIGH VELOCITY PRESSURE SWITCH PS-11 LOW VELOCITY PRESSURE SWITCH NOTES: 1. Vent limiting devices provided wherever possible, when venting is required* the venting to outside is by others on indoor units.. Units with 900 MBH and less use a pressure regulator (not shown) for high fire setting.. For inlet pressures under W.C. - Please consult factory. 4.,00 MBH and above will require a minimum inlet pressure of 1 PSIG. For inlet pressures under 1 PSIG - Please consult factory.. Units that are listed to the Z8.4 standard (0% make-up air) carry both ETL and CETL approvals. 6. Standard manifold meets FM requirements for inputs under,00 MBH for ETL listed units. 7. Standard manifold meets IRI requirements for ETL listed units. 8. High gas pressure regulator required if inlet pressure exceeds 1/ PSIG for inputs up to and including 900 MBH or inlet pressures over PSIG for inputs greater than 900 MBH. 4

35 Cabinet Arrangements Horizontal Discharge Vertical Discharge HRT HRS HRB VLT VST VRT HLT HLS HLB For all arrangements shown, controls are on near side.

36 C A Unit Weights (Approximate) D B Blower Section Model Inlet Damper V-Bank Filter Burner Return Air Discharge Louver APPROXIMATE WEIGHT (LBS.) Airflow Station C000616A Vertical Stand Weights

37 Guide Specification Base Unit Base Bid Sterling model SDFI make-up air unit(s) designed for indoor application. The unit discharge shall be designed for easy adaptation to external duct work or optional accessories. The unit(s) shall be capable of delivering cfm at ESP using a horsepower (ODP) (TEFC) motor operating on (8//) (//) (4//). Burner Section The line burner shall be capable of delivering BTUH firing on (natural gas) (propane) at an inlet pressure of (inches water column) (PSIG). The standard ETL listed unit will meet ANSI, FM, and IRI requirements. Both burner and blower shall be compensated for an altitude of feet above sea level. Manifold to be located outside of air stream. An observation port shall be located to provide view of pilot and main flame. Unit(s) shall be supplied with a wide range burner with a modulating turndown ratio of :1. Adjustable profile plates shall be provided and sized to maintain the require velocity across the line burner. The operation of the burner shall be programmed through the flame safeguard with timed prepurge and flame-sensed by means of ultra violet scanner. The burner assembly and gas manifold shall be completely prepiped and factory tested prior to shipment. The unit shall be controlled by: (One of Three options, Choose one) Option 1 AirTrak DDC control module with full BACnet compatibility. Unit shall have the AirTrak (pick one): 1. MDT Modulating Discharge Temperature Control System.. MRT Modulating Room Temperature Control System.. MDT-Expert Modulating Discharge Temperature Control System. 4. MRT-Expert Modulating Room Temperature Control System.. MDT-Touch Modulating Discharge Temperature Control System. 6. MRT-Touch Modulating Room Temperature Control System. The AirTrak DDC control system shall include but not be limited to the following controls required for standard operation: Electronic time clock with normal, holiday, and override schedules. (Optional accessory on MDT or MRT Control Systems). Timed freeze protection to prevent heater from discharging unheated air into the building. Inlet On-Off ductstat which will turn burner off when inlet temperature equals desired discharge air temperature as fuel savings mode. On-Off night setback thermostat for lower operating temperatures in unoccupied mode as fuel savings mode. (Optional accessory on MDT or MRT Control Systems). Option System 14 Discharge Temperature Control. The System 14 control system shall include but not be limited to the following controls required for standard operation: Amplifier mounted in electrical control panel with sensitivity adjustments and one (1) calibrating potentiometer. Remote temperature selector mounted on optional Remote Control Panel and can be installed in any convenient location for remote adjustment of leaving air temperature between to 90 F. Timed freeze protection to prevent heater from discharging unheated air into the building. Modulator/Regulator valve mounted in gas piping manifold that receives electrical signal from amplifier and adjusts gas pressure to maintain desired leaving air temperature. Option System 44 Room Temperature Control. The System 44 control system shall include but not be limited to the following controls required for standard operation: Amplifier mounted in electrical control panel contains adjustments for maximum and minimum discharge air temperature, three () calibrating potentiometers and a sensitivity adjustment. Remote temperature Selectrastat mounted on optional Remote Control Panel and installed in heated area for adjustment of room temperature between to 90 F. Timed freeze protection to prevent heater from discharging unheated air into the building. Modulator/Regulator valve mounted in gas piping manifold that receives electrical signal from amplifier and adjusts gas pressure to maintain desired room air temperature. UNIT CASING Unit casing and accessories shall be fabricated from heavy-gauge bright spangled galvanized steel suitably reinforced to insure rigidity. All casings shall be air tight. Complete access shall be provided to all components. This includes the blower, burner, and electrical components. BLOWER SECTION Each unit shall be supplied with centrifugal forward curve, DWDI fan(s) rated in accordance with AMCA standards. The fan or fans shall be mounted on a solid shaft for single blowers and a hollow shaft for double blowers. Shaft designed for a maximum operating speed not to exceed 7% of its first critical speed. Bearings are to be external heavyduty industrial prelubricated type. Blowers to be driven by a V-belt package sized with a capacity of % greater than the motor horsepower. Multiple belt applications will be matched sets. Drives are to be (fixed) (adjustable). Maximum outlet velocity FPM. Motor to be externally mounted on adjustable slide base. Belt guard shall be provided for protection. 7

38 Guide Specification Base Unit CONTROL ENCLOSURE The units(s) shall be supplied with a control compartment and all controls mounted within this compartment are to be wired to a numbered terminal strip. All wiring is to be color coded and in accordance with the NEC. A circuit diagram of the approved electrical drawing is to be laminated to the inside of the control cabinet door. All electrical components shall bear a recognized label. STANDARD CONTROLS 1. Main fan starters and overloads. Control circuit fuses. High temperature limit switch 4. Flame safeguard with alarm contacts. UV flame detection 6. Ignition transformer 7. Automatic pilot valve 8. Main gas automatic safety shutoff valve 9. Air proving differential switch. Control transformer OPTIONAL ACCESSORIES 1. V-Bank filter section with filters. Motorized inlet air damper. Insulation 4. Vibration hangers or mounting feet. Clogged filter indication 6. Disconnect switch 7. Painted galvanized casing 8. High gas pressure regulator (required for inlet pressure over 1/ PSIG) 9. Vertical arrangement with support stand and birdscreen. Mixed air section with or without return air flow station 11. Return air after the burner 1. Discharge nozzles 1. Fixed or revolving discharge Volt service receptacle. BACview controller or Touchscreen (for DDC Control systems only) 16. U.L. labeled control panel 17. Firestat 18. FM or IRI controls 19. Electronic time clock (Not Available with Expert or Touch DDC Control Systems). On-off night setback thermostat (Not Available with Expert or Touch DDC Control Systems) 1. NEMA 1 or NEMA 1 remote control panel (System 14 or System 44 controls only). Inlet on-off ductstat (System 14 or System 44 controls only). VFD controller 4. Exhaust interlock. Interlocking relay Guide Specification Mixing Dampers With Return Air Flow Station Unit(s) shall have outside air and return air dampers with modulating actuator controlled by AirTrak DDC control system (Patent #7,09,6). The AirTrak DDC control system shall have capability to digitally control the outside air quantity from a nominal minimum of % to 0% with integrated gas valve control at all room concentrations of CO. The return air inlet shall include a self-calibrating flow measuring station with a grid of velocity pressure probes with spacing no greater than 1 over the entire face of the return air opening and sampled every second. Samples are averaged to provide smooth, accurate data that is delivered to the AirTrak DDC control system every second. The DDC control system shall be capable of electronically displaying the return air/outside air ratio within % accuracy at all damper positions. The AirTrak DDC control system shall be capable of controlling mixing dampers in: (Choose One) Manual Mode: The Manual mode allows manual positioning of the outside air (O.A.) damper and return air (R.A.) damper by changing the damper position setpoint. Mixed Air Temperature Mode: The Mixed Air Temperature mode shall provide automatic control of the mixed air temperature by modulating the outside air (O.A.) damper and return air (R.A.) damper to maintain the mixed air temperature setpoint. Building Pressure Mode: The Building Pressure mode shall provide automatic building pressure control by modulating the outside air (O.A.) damper and return air (R.A.) damper to maintain the indoor building pressure setpoint. As the building pressure decreases below the setpoint more outside air will be introduced. 8

39 Guide Specification BACview or Touchscreen Controller The display functions of the remote keyboard or touchscreen display for the AirTrak DDC control system shall include but not be limited to the following: Return air temperature Outside air temperature Discharge air temperature Mixed air temperature Maximum allowable temperature rise Actual temperature rise Current percent of outside air Current building pressure (optional) Current damper input voltage (optional) Current burner input voltage Fan operating hours since last reset Fan start cycle count since last reset Burner operating hours since last reset Burner start cycle count since last reset Cooling interlock operating hours since last reset Cooling interlock cycle count since last reset Critical alarm conditions: o Airflow switch failure o Unit on, fan off o Unit off, fan on o Low discharge temperature o Safety circuit open o Burner jumped The control settings available on the remote keyboard or touchscreen display for the AirTrak DDC control system shall include but not be limited to the following: Heating setpoint Cooling setpoint Economizer options Setback setpoint Freeze protection setpoint Maximum discharge air temperature setpoint Minimum discharge air temperature setpoint Minimum ventilation option and setpoint Time of day schedule selection and setpoints (Not available on MDT or MRT Control Systems) o Normal /7 schedule o Holiday schedule o Manual override 9

40 Efficient Direct Fired Gas Heating System Choose Sterling Direct Fired Gas Heating Heat large or small spaces efficiently with 0% combustion efficiency Constantly replace contaminated indoor air with fresh, heated outside air Low operating and maintenance costs Fresh air ventilation anytime just turn off the gas heating system Simple, inexpensive installation Sterling, a leader in research, engineering, and customer service since 1946 Fans tested to AMCA standards to insure rated airflow Sterling Transport Drive Dallas TX 747 Telephone Printed in U.S.A. Copyright U.S.A. 16