Warm. SDR Direct Fired Gas Heating System. Sterling. Keeps You. Technical Guide for: Outdoor or Indoor Mounted Units To 16,000 CFM And 1.

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1 TGSDR- SDR Direct Fired Gas Heating System Technical Guide for: Outdoor or Indoor Mounted Units To 16,000 CFM And 1.97M BTUH Sterling Keeps You Warm Featuring the Patented AirTrak controlled Circulation System

2 SDR 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 kitchen, 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, unit weights and cabinet arrangement diagrams. If you have questions, please contact Sterling s Customer Service Department at We ll be glad to help. 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 Air Pressure Drop Table... 6 Burner Performance Table... 7 Horizontal Base Unit Without V-Bank... 8 Horizontal Base Unit With V-Bank... 9 Horizontal Base Unit With V-Bank and Mixing Dampers... Roof Curbs Vertical Base Unit With V-Bank... 1 Vertical Base Unit With V-Bank and Mixing Dampers... 1 Discharge Options Control Systems Cabinet Arrangements... 6 Amp Draw Table... 6 Pre-Purge Timing... 6 Typical Gas Piping Layout... 7 Unit Weights Horizontal Unit Vertical Unit... 0 Guide Specification Base Unit Mixing Dampers With Return Air Flow Station... BACview or Touchscreen Controller... 4

4 Air Delivery Table 0 & s Unit 0 x Wheel 1 x 1 Wheel SCFM ¼ HP 1 1-1/ 1-1/ 1-1/ 1½ HP 1 1-1/ 1-1/ 1¾ HP 1-1/ 1-1/ 1-1/ 7-1/ HP 1-1/ 1-1/ 7-1/ 7-1/ Total Static Pressure (W.C.) ¼ ½ HP HP 1-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ ¾ HP 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ HP 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ ¼ HP 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ ½ HP 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ = No Selection Available NOTE: Horsepower selections are based on system total static pressure. One or more of the following must be added when applicable. See pressure drops on page 6 for burner section and optional inlet hood and V-bank sections. A. Fresh Air Inlet Hood & Birdscreen. W.C. B. Fresh Air Inlet Hood with Filters W.C. C. V-Bank Filter Section W.C. D. Burner Section W.C. 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 size and motor horsepower from table. 4

5 Unit 1 18 x 18 Wheel x Wheel ¼ HP 7-1/ 7-1/ 7-1/ Total Static Pressure (W.C.) SCFM 7,0 7,00 7,70 8,000 8,0 8,00 8,70 9,000 9,0 9,00 9,70,000,00 11,000 11,00 1,000 1,00 1,000 1,00 14,000 14,00 1,000 1,00 16,000 Air Delivery Table 1 & s 1½ HP 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 1 1¼ HP 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 1¾ HP 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 1 1 ½ HP 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ ¾ HP 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ HP 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ ¼ HP 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 7-1/ 1 7-1/ ½ HP 7-1/ HP 7-1/ 7-1/ 7-1/ 7-1/ = No Selection Available

6 Air Pressure Drop Table All s Unit 0 1 SCFM No Filters Inlet Hood Filter Section Discharge Options With 1 With With 1 With 1 With 1 With With With F No Cleanable Cleanable TAW Pleated Cleanable TAW Pleated Cleanable Nozzles and Filters Filters Filters Filters Filters Filters Filters Filters Filters R , , , , , , , , , , , , , Burner Section W.C. (All Sizes) 8F and 8R 6

7 Burner Performance Table All s Unit Size 0 1 SCFM ,000,00 11,000 11,00 1,000 1,00 1,000 1,00 14,000 14,00 1,000 1,00 16, 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 Table are based on -40 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. 7

8 Horizontal Base Unit without V-Bank C00006 UNIT COMPONENTS 1. Centrifugal supply fan. Fan motor. Line burner 4. Control cabinet. Hinged control cabinet access door 6. Observation port 7. Access door 8. Lifting lug 9. Unit base. Manifold compartment 11. Gas connection 1. Electrical connection Blower Size x 1 x 1 18 x 18 x Blower Size x 1 x 1 18 x 18 x A L B M C N E ¼ P F ¼ Q ¾ G ½ 0¼ ¼ 9¼ R H 7 7½ S ½ J 1¼ 1¼ 1¼ 1¼ K Filters Hood Qty - Size ) 0 x 6) 16 x 0 6) 0 x 9) 0 x NOTE: All dimensions in inches subject to manufacturing tolerances. 8

9 Horizontal Base Unit with V-Bank C0000 UNIT COMPONENTS 1. Centrifugal supply fan. Fan motor. Line burner 4. Control cabinet. Hinged control cabinet access door 6. Observation port 7. Access door 8. Lifting lug 9. Unit base. Manifold compartment 11. Gas connection 1. Electrical connection Blower Size x 1 x 1 18 x 18 x Blower Size x 1 x 1 18 x 18 x A L M B N C P E ¼ Q ¾ F ¼ R S ½ G ½ 0¼ ¼ 9¼ H 7 7½ Filter Hood Qty - Size ) 0 x 6) 16 x 0 6) 0 x 9) 0 x J 1¼ 1¼ 1¼ 1¼ K Filter V-Bank Qty - Size 4) 0 x 0 6) 16 x 6) 0 x 1) 0 x 0 NOTE: All dimensions in inches subject to manufacturing tolerances. 9

10 Horizontal Base Unit with V-Bank and Mixing Dampers C00044A UNIT COMPONENTS 1. Centrifugal supply fan. Fan motor. Line burner 4. Control cabinet. Hinged access door 6. Observation port 7. Electrical connection 8. Lifting lug 9. Unit base. Manifold compartment 11. Gas connection 1. Airflow station Blower Size x 1 x 1 18 x 18 x Blower Size x 1 x 1 18 x 18 x A N P B Q ¾ C R S E ¼ ½ T F ¼ G ½ 0¼ ¼ 9¼ U V H 7 7½ W J 1¼ 1¼ 1¼ 1¼ K Filter Hood Qty - Size ) 0 x 6) 16 x 0 6) 0 x 9) 0 x L M Filter V-Bank Qty - Size 4) 0 x 0 6) 16 x 6) 0 x 1) 0 x 0 NOTE: All dimensions in inches subject to manufacturing tolerances.

11 Roof Curbs C Blower Size x 1 x 1 18 x 18 x Blower Size x 1 x 1 18 x 18 x A ¼ L 1 9½ 67½ 7½ 8½ Base Unit Only W 1 ½ 4½ ½ ½ B ¼ L 91½ 99½ ½ 11½ C Base Unit w/v-bank W ½ 4½ ½ ½ D G E H F 1 Standard Height Base Unit w/v-bank & Return Air L 91½ 99½ ½ 1½ F Optional Height W ½ 4½ ½ ½ NOTE: All dimensions in inches subject to manufacturing tolerances. 11

12 Vertical Base Unit with V-Bank C00047 UNIT COMPONENTS 1. Centrifugal supply fan. Fan motor. Line burner 4. Control cabinet. Hinged access door 6. Observation port 7. Electrical connection 8. Lifting lug 9. Support stand. Manifold compartment 11. Gas connection 0 1 Blower Size x 1 x 1 18 x 18 x A B C D E ¼ 0 1 Blower Size x 1 x 1 18 x 18 x F ¼ J L M Filters V-Bank Qty - Size 4) 0 x 0 6) 16 x 6) 0 x 1) 0 x 0 NOTE: All dimensions in inches subject to manufacturing tolerances. 1

13 Vertical Base Unit with V-Bank and Mixing Dampers C00048 UNIT COMPONENTS 1. Centrifugal supply fan. Fan motor. Line burner 4. Control cabinet. Hinged access door 6. Observation port 7. Electrical connection 8. Lifting lug 9. Support stand. Manifold compartment 11. Gas connection 1. Airflow station Blower Size x 1 x 1 18 x 18 x Blower Size x 1 x 1 18 x 18 x A L M B T 0½ 0½ 1½ 6½ C D U 8½ 9½ 49½ 49½ V E ¼ W F ¼ J Filters V-Bank Qty - Size 4) 0 x 0 6) 16 x 6) 0 x 1) 0 x 0 NOTE: All dimensions in inches subject to manufacturing tolerances. 1

14 Discharge Options F and R Discharge and Weights C Size 0 1 Discharge Size D -/ 6-17/ 4-17/ 49-17/ L /8 18-1/4 0-1/8 Discharge and Weight F and R Discharge W 4-1/ / Weight F Weight R NOTES: 1. All dimensions are in inches.. All weights are in pounds. 14

15 Discharge Options F and R Discharge Coverage SCFM Discharge Size Mounting Height Fixed Coverage Revolving Coverage X X x x x 7 7 x x 7 7 x x x x 7 7 x X X X 8 8 X x 8 8 x x x x 8 8 x x x x x x x x x x x x 9 9 x x x x x x x X 1 1 X X X x x x 7 7 x x 9 9 x x 1 1 x x x x x x x x x x x x x 11 1, x x 116 1, x x , X X 11, x x 11 1, x 1 1 x 1 1, x x 14 1, x 1 1 x 1 1, x x 16 14, x x 18 14, x x 19 1, x x 1, x x 11 16, x 1 1 x 1 1

16 Discharge Options 8F and 8R Discharge and Weights C00078 Size 0 1 Discharge Size D8 -/ 6-17/ 4-17/ 49-17/ L8 9-7/8-1/ 47-1/16 4-9/16 Discharge and Weight 8F and 8R Discharge W8 47-1/ / Weight 8F Weight 8R NOTES: 1. All dimensions are in inches.. All weights are in pounds. 16

17 Discharge Options 8F and 8R Discharge Coverage SCFM Discharge Size Mounting Height Fixed Coverage Revolving Coverage X 7 7 X x 9 9 x x 6 6 x x x x x x x x x x X x 7 7 X x x x x x x x x x x x 8 8 x x 8 8 x x x x 8 8 x x x x x x X X 9 9 X x x x 9 9 x x x x X x x x 0 0 x x 1 1 x x x x x x 4 4 x 4 1, x x 1, x 6 6 x , X 8 8 X 8 11, X x 111 1, x x 11 1, x x 11 1, x x 11 1, x x , X x 11 14, X x 116 1, x x 118 1, x x , X X 17

18 BT48 NET + NET - SHIELD RNET+ RNET- +1V IN-1 IN- IN- IN-4 0 IN- IN-6 LED - SENSE +1V RNCT+ RNCT- LOCAL ACCESS Rx Tx Batt + CR 0 INPUTS 1& 0V,THERM OR DRY INPUTS & 4 THERM OR DRY CLASS 4 Vac. 0/60 CYCLE Ova, 0.8A USE COPPER CONDUCTORS ONLY. INPUTS & 6 THERM DRY or LStat CAUTION: 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 16 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 LStat Rnet Format Gnd Short Pins L Stat Hot IN- 4 V ac Power IN-7 Run Pot. +V Error Only Gnd Thermistor/ Dry Contact IN-8 0- vdc Comm Selector DIP Switch Off On Power for D.O.s On 4 1 Gnd A0- Gnd A0- AO: Gnd 0-vdc ma Max. A0-1 BACnet DO- DO-4 DO- DO- DO-1 BUS 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 I.D. COMPONENT 1. Unit DDC I.D. Controller 1. Unit. DDC Signal Controller Conditioner. Signal Conditioner. Modulating Gas Valve. Discharge Air Sensor. Modulating 4. Inlet Gas Air Valve Sensor. Discharge 6. Remote Air SensorControl Station 4. Inlet Air Sensor 6. Remote Control Station 4 O nes Tens Com m RNET + } 1 I/O ZONE Discharge Temperature SET Here

19 BT48 NET + NET - SHIELD RNET+ RNET- +1V IN-1 SENSE +1V RNCT+ RNCT- LOCAL ACCESS A0- + IN- 0 IN- IN-6 LED nes - Rx Tx Batt + CR 0 INPUTS 1& 0V,THERM OR DRY INPUTS & 4 THERM OR DRY CLASS 4 Vac. 0/60 CYCLE Ova, 0.8A USE COPPER CONDUCTORS ONLY. INPUTS & 6 THERM DRY or LStat CAUTION: To Reduce The Risk of Fire or or Electrical Shock, Do Not Interconnect Outputs of Different Class Circuits Format Jumper LStat / Rnet Port Selector Jumper Communications Selection EIA-48 Gain 1 Jumper Communication Selection Jumper BACnet over ARC 16 Format Short Pins L Stat IN- Power Run Error Comm Selector DIP Switch IN- BAUD Rates SW1 SW PROTOCOLS SW1 SW 900 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 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. COMPONENT I.D. 1. Unit DDC 1. Controller Unit DDC Controller. Modulating Gas Valve 4. Inlet Air Sensor. Signal Conditioner 4. Inlet Air Sensor. Signal Conditioner. Discharge Air Sensor. Modulating Gas Valve. Discharge Air Sensor Room Thermostat 6. Room Thermostat 7. Remote Control Station O Tens Com m RNET } 1 I/O ZONE Space Temperature SET Here Space Temperature SENSED Here 19

20 Control Systems MDT Expert Control Systems C 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 6 to set discharge temperature setpoint and operating schedules. Service information, operating feedback, and alarm status can also be monitored. 0

21 NET + NET - SHIELD BT RNCT+ RNCT- 1 RNET+ RNET- +1V IN-1 IN- IN- IN-4 IN- IN-6 LED 0 nes - SENSE +1V LOCAL ACCESS Rx Tx Batt + CR 0 INPUTS 1& 0V,THERM OR DRY INPUTS & 4 THERM OR DRY CLASS 4 Vac. 0/60 CYCLE Ova, 0.8A USE COPPER CONDUCTORS ONLY. INPUTS & 6 THERM DRY or LStat CAUTION: 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 16 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 LStat Rnet Format Gnd Short Pins L Stat Hot IN- 4 V ac Power IN-7 Run Error Comm Selector DIP Switch Off On Pot. Only Thermistor/ Dry Contact 0- vdc Power for D.O.s AO: 0-vdc ma Max. BACnet +V Gnd IN-8 On 4 1 Gnd A0- Gnd A0- Gnd A0-1 DO- DO-4 DO- DO- DO-1 BUS 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. COMPONENT I.D. 1. Unit DDC 1. Unit Controller DDC Controller. Modulating. Modulating Gas Valve Gas Valve. Discharge. Discharge Air Sensor Air Sensor. Signal Conditioner. Signal Conditioner 4. Inlet Air 4. Sensor Inlet Air Sensor 6. Room Thermostat 6. Room Thermostat 7. BACView Interface 7. BACView O Tens Com m RNET } 1 I/O ZONE Space Temperature SET Here Space Temperature SENSED Here 1

22 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.

23 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.

24 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. 4

25 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.

26 Cabinet Arrangements and Electrical Data Cabinet Arrangement For all arrangements shown, controls are on near side. C00047 HRS HRB VLT VRT HLS HLB Amp Draw Table Item A Item B SOURCE AMPS () Blower Motor SOURCE AMPS () Blower Motor NOTES: 1) NA = Not Available ) Motor amps are based on 011 edition of NEC. Steps to Size Optional Disconnect Switch: MOTOR HORSEPOWER 1 1-1/ 11V 1 PH NA 0V 1 PH NA 08V PH V PH V PH V PH MOTOR HORSEPOWER 7-1/ V PH V PH V PH V PH SOURCE AMPS ALL SIZES Controls Allow Amps Maximum 1. Find Blower Motor HP from tables on pages Find amp draw for Blower Motor HP from chart in Item A above.. Add amps for Controls from Item B above. 4. Add amps from steps, and, then multipy by 1.. Pre-Purge Timing The standard unit is provided with a second pre-purge timer which is good for all rooftop units without inlet duct work. If inlet duct is attached to heater, ANSI requirements stipulate that the inlet duct must be purged four times prior to trial for ignition. to calculate the maximum allowable inlet duct lenth, use: Maximum Inlet Duct Length (feet) = Inlet Duct Velocity (FPM) / 4 C

27 Gas Piping Layout Schematic Component Diagrams C

28 Weights Horizontal Unit Weights (Approximate) C00008 Total (Base Unit) A Base Unit without V-Bank Corner Weights B C D Shipping Crate Inlet Hood (No Filters) Red 19 8 Red NOTE: Color shown under corner weights indicates proper optional hanger isolator.

29 Weights Horizontal Unit Weights (Approximate) C Total (Base Unit) A Base Unit with V-Bank Corner Weights B C D 17 Red Shipping Crate Inlet Hood (No Filters) Total (Base Unit) NOTE: Color shown under corner weights indicates proper optional hanger isolator. A Base Unit with V-Bank & Return Damper Corner Weights B C D 18 Red Shipping Crate Inlet Hood (No Filters)

30 Weights Vertical Unit Weights (Approximate) C Total (Base Unit) Total (Base Unit) E E Base Unit with V-Bank Corner Weights NOTE: Multiply times following factors for other heights: , 48-1., 4-1.0, F Base Unit with V-Bank & Return Damper Corner Weights F G G H H Shipping Crate Shipping Crate Stand (See Note) Stand (See Note)

31 Guide Specification Base Unit Base Bid Sterling SDR make-up air unit(s) designed for outdoor application. The unit discharge shall be designed for easy adaptation to external ductwork or optional accessories. The unit(s) shall be capable of delivering SCFM at TSP using a horsepower (ODP) (TEFC) motor operating on (11/1/60)(0/1/60) (08//60) (0//60) (460//60)(7//60). 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 and shielded from atmospheric conditions by means of a protective compartment with hinged access. An observation port shall be located to provide view of main flame. Unit(s) shall be supplied with wide range burner with a modulating turndown ratio of :1. Adjustable profile plates shall be provided and sized to maintain the required velocity across the line burner. The operation of the burner shall be programmed through the ignition controller with timed prepurge and flame sensed by means of a flame rod. 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 sensor 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 galvanized steel panels and extruded aluminum frame. The base of the unit shall be formed of heavy-gauge galvanized steel with built in curb adapter (horizontal units only). All casings shall be airtight and weatherproof. Roof panels shall be convex to prevent ponding, and designed with a standing seam to prevent water entrainment. Cabinet shall be designed with roof eaves to prevent water from getting into wall panels. Complete access shall be provided to all components through gasketed, hinged access doors. This includes the motor, blower, burner, electrical components and manifold sections. 1

32 Guide Specification Base Unit (con t) BLOWER SECTION Each unit shall be supplied with centrifugal forward curve, DWDI fan rated in accordance with AMCA standards. The fan shall be mounted on a heavy-duty polished steel shaft designed for a maximum operating speed not to exceed 7% of its first critical speed. Bearings are to be heavy-duty 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). Motor to be mounted on adjustable base. Door safety interlock switch shall be provided for protection when blower access door is opened. CONTROL ENCLOSURE The unit(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 in accordance with the NEC. A circuit diagram is to be laminated to the inside of the control cabinet door. All electrical components shall bear a recognized label. CONTROLS 1. Main fan starter and overloads. Control circuit fusing. High temperature limit switch 4. Flame rod sensor. Ignition module 6. Main gas automatic shutoff valves 7. Air proving differential switches 8. Factory wired motorized inlet damper complete with end switch 9. Control transformer. Remote control panel with DDC controls OPTIONAL EQUIPMENT 1. V-Bank filter box with 1 or filters. Inlet hood and birdscreen with or without filters. Insulation 4. Full perimeter roof curb (horizontal units only). Vibration hangers 6. Clogged filter indication 7. Disconnect switch 8. 0 gauge liners 9. High gas pressure regulator (required for inlet pressure over 1/ PSIG). Vertical arrangement with support stand and birdscreen 11. Mixing dampers with return air flow station 1. Internal blower/motor isolation (horizontal units only) 1. Discharge nozzles 14. Firestat Volt service receptacle 16. BACview controller (for DDC Control systems only) 17. High/low gas pressure switch 18. Fixed or revolving discharge 19. Electronic time clock (Not Available with Expert DDC Control Systems) 0. On-off night setback thermostat (Not Available with Expert DDC Control Systems) 1. NEMA 1 or NEMA 1 remote control panel (System 14 or System 44 controls only). VFD controller. Exhaust interlock 4. Interlocking relay

33 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 0% to 0% with integrated gas valve control at all room concentrations of CO. The return air inlet shall include a selfcalibrating 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. 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 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 4

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36 Efficient Direct Fired Gas Heating System Choose Sterling Direct Fired Gas Heating Heat large or small spaces with 0% combustion efficiency Constantly replace contaminated indoor air with fresh, heated outside air Optional evaporative cooling 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. 01