GQVC-12 HVAC EQUIPMENT. GAS-FIRED INDOOR HEATING EQUIPMENT A complete line of effi cient heating solutions for large, open spaces.

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1 GQVC-12 HVAC EQUIPMENT GAS-FIRED INDOOR HEATING EQUIPMENT A complete line of effi cient heating solutions for large, open spaces.

2 80% thermal efficiency. Heat Exchangers have a tough job to do. It's no place for a lightweight. Sterling's minimum metal standard (aluminized or stainless steel) is 20 gauge. Cabinets are strong enough for the contractor to install without added support. Sterling uses 20 gauge panels and baked enamel on all four sides for that finished look. Summer Air. The complete line of Sterling heaters is factory wired for summer air circulation. All that's needed is the Sterling thermostat (option AS-G3) to provide year round comfort. Complete fan guards for added safety. Including optional OSHA type guards. Unique burner shade prevents scale from plugging burner ports and hindering unit heater efficiency. CATALOG CONTENTS ENERPAK PROPELLER TYPE UNIT HEATERS 100 TO 400 MBH General Information...4 Performance and Dimensional Data...5 ENERPAK BLOWER TYPE UNIT HEATERS 100 TO 400 MBH General Information...6 Performance and Dimensional Data...7 SEPARATED COMBUSTION PROPELLER TYPE UNIT HEATERS 100 TO 400 MBH General Information...8 Performance and Dimensional Data...9 SEPARATED COMBUSTION BLOWER TYPE UNIT HEATERS 100 TO 400 MBH General Information...10 Performance and Dimensional Data...11 INDOOR DUCT FURNACES General Information...12 Dimensional Data...13 Performance Data and Curves...14 SEPARATED COMBUSTION INDOOR DUCT FURNACE General Information...15 Dimensional Data...16 Performance Data & Curves...17 CABINET BLOWERS General Information & Motor Data...18 Dimensional Data...19 Performance Data...20 GENERAL INFORMATION High Altitude Correction Factor...21 Sound Rating...21 Gas Heating Valve...21 Unit Heater Placement and Calculating Heat Loss...22 HEAT THROW DATA...23 & 24 NOZZLE DIMENSIONS...25 TYPICAL STANDARD SPECIFICATIONS Enerpak, Duct Furnaces and Cabinet Blowers & 27 SELECTION GUIDE...28 OPTIONAL EXTRAS Optional Descriptions and Order Numbers...29 & 30 WARRANTIES

3 THE STERLING ADVANTAGE All Sterling Unit Heaters are factory test-fired to assure proper operation. 10-Year Warranty on burners, heat exchanger and flue collector; certified by ETL. Sterling Unit Heaters, offered in both propeller and blower-type models, are a complete heat generating and distributing plant, equipped with automatic controls, and packaged in an attractive streamlined housing. Designed for ceiling mounting, they provide a convenient, low-cost method of heating stores, factories, warehouses and other large open areas comfortably. The Sterling Unit Heater becomes the industry standard bearer by providing a winning combination of money saving features and many other customer benefits. Its innovative design provides 80% combustion efficiency and improved seasonal efficiency through integral power venting and a sealed flue collector. Its standard fuel efficient spark ignition saves even more. The pilot only operates when required. Horizontal power venting allows less costly side wall venting, smaller openings and single walled vent pipe. The Sterling propeller fan, which utilizes a powerful motor, increases airflow through the unit - resulting in approximately 10% more CFM. Summer air circulation for added comfort is featured on all units, with factory installed relay and wiring. Removing just two screws permits ready access to burners for inspection and servicing. Unique burner shade prevents scale of foreign matter from plugging burner ports and hindering efficiency. Reduced heat loss, improved efficiencies and higher CFM often allow lower equipment and installation costs. And because Sterling has a full line of heaters, customers can order the exact unit they need and avoid money-wasting oversizing. The complete heat exchanger, draft hood assembly and burners of the propeller and blower of the Sterling Unit Heaters are warranted to be free from defects in materials and workmanship for a period of 10 years from the date of manufacture. Sterling, A Mestek Company, has been a major producer of C.S.A. International and ETL certified unit heaters for over half a century. Rooftop furnaces, evaporative cooling units and packaged heating, ventilating and cooling systems, enhance Sterling's complete HVAC equipment line. 3

4 QVEF ENERPAK HIGH EFFICIENCY PROPELLER TYPE GAS-FIRED UNIT HEATERS OUR MOST ENERGY EFFICIENT INDOOR POWER VENTED GAS-FIRED UNIT HEATER The Sterling Enerpak Propeller Type Unit Heaters achieve 80% thermal efficiency and annual fuel savings of 20 to 25% over conventional gravity vented heaters. Enerpak features a factory installed power venter and sealed flue collector that controls combustion and excess air during the on-cycle. Heated air no longer escapes through a draft diverter opening during the off-cycle. Energy saving spark ignition reduces gas losses; the pilot only operates when required. Horizontal power venting allows side wall venting, smaller openings and single walled vent pipe, reducing heat loss. Higher efficiencies can reduce equipment and material costs as well as installation time. Certified by ETL and approved for installation in Canada. 10-YEAR WARRANTY The complete heat exchanger, flue collector and burners are warranted by Sterling HVAC Equipment to be free from defects in materials and workmanship for a period of ten (10) years from the date of manufacture. QUIET OPERATION Sterling Unit Heaters incorporate exceptionally balanced fan blades to insure quiet operation and added heat throw. HEAT EXCHANGERS All Sterling 20 gauge heat exchangers are available in 3 types of: Aluminized Steel (Standard) 409 Grade Stainless Steel (Optional) 321 Grade Stainless Steel (Optional) BURNERS All sizes 100,000 thru 400,000 BTU/HR (8.8 thru kw) input are equipped with a proven design pressed steel burner having a unique burner shade protective device to maximize combustion efficiencies by preventing scale or foreign matter from plugging the burner ports. LP/NATURAL OPERATION All units are available for operation on either natural or LP gas from our factory. YEAR ROUND COMFORT Controls are factory wired permitting continuous air circulation for summer comfort. (Optional Sterling thermostat - AS-G3 - is added.) 24 VOLT SYSTEM All units are equipped with a 24 volt control system which is powered by a 115/24 volt transformer as standard equipment. FAN TIME DELAY The fan time delay is mounted at the factory as standard equipment. This feature eliminates an initial blast of cold air by allowing the unit to fire for a short period of time before actuating the fan motor. After the thermostat is satisfied (with burners off), the fan continues to operate for approximately 1 minute, removing residual heat from the heat exchanger. ENERGY SAVING IGNITION CONTROL (Standard) The pilot burner is ignited only during each cycle of operation, thereby conserving energy during the off-cycle. EASY ACCESS FOR MAINTENANCE All Sterling Unit Heaters are so designed that the burner access panel is removed with just two screws. Burners are individually removable for inspection and servicing. Pilot is also accessible through side panel access door, on 100 thru 400 models. IDEAL FOR RETROFIT Sterling Enerpak Units lets you pocket the fuel savings from Day One, and provides years of dependable operation with 10-Year Warranty protection. TEST FIRE All Sterling Unit Heaters are test fired to insure proper operation. 4

5 QVEF PERFORMANCE AND DIMENSIONAL DATA INTERTEK VERIFIED CM ENERGY PERFORMANCE VERIFIED RENDEMENT ENERGETIQUE VERIFIE Model QVEF Unit Size PERFORMANCE DATA Input BTU/Hr 100, , , , , , , , , ,000 (kw) (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1) Output BTU/Hr 80, , , , , , , , , ,000 (kw) (23.4) (29.3) (35.1) (41.0) (46.9) (52.7) (58.6) (70.3) (82.0) (93.7) Thermal Efficiency (%) Free Air Delivery CFM 1,480 1,650 2,200 2,530 2,640 2,700 3,100 4,400 5,000 5,300 (cu. m/s) (0.699) (0.779) (1.038) (1.194) (1.246) (1.274) (1.463) (2.077) (2.360) (2.502) Air Temperature Rise Deg. F (Deg. C) (28) (31) (28) (28) (31) (34) (33) (28) (29) (31) Outlet Velocity FPM ,045 1,070 1, ,100 1,150 1,050 (m/s) (3.94) (4.62) (5.31) (5.44) (5.13) (4.83) (4.98) (5.59) (5.84) (5.33) Sound Ratings (See Page 21) II II II III III III IV IV IV IV Full Load Amps at 115V MOTOR DATA : Motor HP 1/20 1/10 1/4 1/3 1/3 1/3 1/3 (2) 1/4 (2) 1/3 (2) 1/3 Motor (kw) (0.037) (0.075) (0.186) (0.249) (0.249) (0.249) (0.249) (0.186) (0.249) (0.249) Motor Type SP SP PSC PSC PSC PSC PSC PSC PSC PSC R.P.M. 1,050 1,050 1,140 1,140 1,140 1,140 1,140 1,140 1,140 1, V DIMENSIONAL DATA in. (mm) A Height to Top of Unit 31-1/4 31-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 (794) (794) (921) (921) (921) (921) (921) (921) (921) (921) B Width of Unit 17-7/8 20-5/8 20-5/8 23-3/8 26-1/8 28-7/8 31-5/8 37-1/8 42-5/8 48-1/8 (454) (524) (524) (594) (664) (733) (803) (943) (1083) (1222) C Height to Top of Hanger 34-1/8 34-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8 (867) (867) (994) (994) (994) (994) (994) (994) (994) (994) D Depth to Rear of Housing 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 37-1/2 (952) (952) (952) (952) (952) (952) (952) (952) (952) (952) E Hanging Distance Width 14-1/2 17-1/4 17-1/ /4 25-1/2 28-1/4 33-3/4 39-1/4 44-3/4 (368) (438) (438) (508) (578) (648) (718) (857) (997) (1137) F Discharge Opening Width 15-3/8 18-1/8 18-1/8 20-7/8 23-5/8 26-3/8 29-1/8 34-5/8 40-1/8 45-5/8 (391) (460) (460) (530) (600) (670) (740) (879) (1019) (1159) G Depth to Unit Side Jacket 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 (492) (492) (679) (679) (679) (679) (679) (679) (679) (679) H Discharge Opening Height (457) (457) (457) (457) (457) (457) (457) (457) (457) (457) J to Centerline of Flue 5-7/8 7-1/4 7-1/4 8-5/ /4 12-3/4 15-1/2 18-1/4 21 (149) (184) (184) (219) (254) (286) (324) (394) (464) (533) K Depth to Centerline of Flue 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 30-5/8 (778) (778) (778) (778) (778) (778) (778) (778) (778) (778) L Hanger Location 16-1/4 16-3/4 16-3/8 16-3/8 16-3/8 16-3/4 16-3/4 16-3/4 16-3/4 16-3/4 (413) (425) (416) (416) (416) (425) (425) (425) (425) (425) Flue Size Dia.-in.* (Dia.-mm) (102) (102) (102) (102) (127) (127) (127) (152) (152) (152) Fan Diameter-in (2) 16 (2) 18 (2) 18 Gas Inlet-Natural Gas-in. 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4 Gas Inlet-LP Gas-in. 1/2 1/2 1/2 1/2 1/2 1/2 OR 3/4 Approx. Shipping Wt lb (kg) (79) (89) (99) (108) (113) (125) (138) (159) (188) (209) Ratings shown are for unit installations at elevations between 0 and 2000 ft. (610m). For unit installations in USA above 2000 ft. (610m), the unit input must be derated 4% for each 1000 ft. (305m) above sea level; refer to local codes, or in absence of local codes, refer to the latest edition of the National Fuel Gas Code ANSI Standard Z223.1 (N.F.P.A. No. 54). For installations in Canada, any references to deration at altitudes in excess of 2000 ft. (610m) are to be ignored. At altitudes of 2000 to 4500 ft. (610 to 1372m), the unit must be derated to 90% of the normal altitude rating, and be so marked in accordance with the ETL certification. LEGEND: SP = SHADED POLE PSC = PERMANENT SPLIT CAPACITOR DIMENSIONS.XXX STANDARD UNITS DIMENSIONS IN PARENTHESIS (XXX) MILLIMETERS 5

6 QVEB ENERPAK HIGH EFFICIENCY BLOWER TYPE GAS-FIRED UNIT HEATERS The advanced Sterling ENERPAK Blower Type Unit Heater keeps energy costs down. The design advances achieve 80% thermal efficiency and annual fuel savings of up to 25% over conventional gravity vented heaters. The Sterling Enerpak features integral power venting (factory installed) and sealed flue collector for optimum combustion. Electronic spark ignition reduces pilot gas losses, and the power venter allows for horizontal venting through side walls. It all adds up to higher seasonal efficiencies and lower installation time. Certified by ETL and approved for use in Canada. TEN-YEAR WARRANTY The complete heat exchanger, flue collector and burner are warranted by Sterling HVAC Equipment to be free from defects in materials and workmanship for a period of ten (10) years from the date of manufacture. QUIET OPERATION Sterling Unit Heaters incorporate an exceptional balanced centrifugal blower to insure quiet operation. HEAT EXCHANGERS All Sterling 20 gauge heat exchangers are available in 3 types of steel: Aluminized Steel (Standard) 409 Grade Stainless Steel (Optional) 321 Grade Stainless Steel (Optional) BURNERS All sizes 100,000 thru 400,000 BTU/HR (29.3 thru kw) input are equipped with a proven design pressed steel burner having a unique burner shade protective device to prevent scale or foreign matter from plugging the burner ports. LP/NATURAL OPERATION All units are available for operation on either natural or LP gas from our factory. YEAR ROUND COMFORT Controls are factory wired to permit continuous air circulation for summer comfort (Just add optional Sterling thermostat AS-G3 ). 24 VOLT SYSTEM All units are equipped with a 24 volt control system which is powered by a 115/24 volt transformer as standard equipment. FAN TIME DELAY The fan time delay switch is mounted at the factory as standard equipment. This feature eliminates an initial blast of cold air by allowing the unit to fire for a short period of time before actuating the fan motor. After the thermostat is satisfied (with burners off) the fan continues to operate for approximately 1 minute, removing residual heat from the heat exchanger. ENERGY SAVING IGNITION CONTROL (Standard) The pilot burner is ignited only during each cycle of operation, thereby conserving energy during the off-cycle. EASY ACCESS FOR MAINTENANCE All Sterling Unit Heaters are so designed that the burner access panel may be removed for inspection and servicing. Pilot is also accessible through side panel access door. IDEAL FOR RETROFIT Sterling Enerpak Units lets you pocket the fuel savings from Day One, and provides years of dependable operation. TEST FIRE All Sterling Unit Heaters are test fired to insure proper operation. 6

7 QVEB PERFORMANCE AND DIMENSIONAL DATA INTERTEK VERIFIED CM ENERGY PERFORMANCE VERIFIED RENDEMENT ENERGETIQUE VERIFIE Model QVEB Unit Size PERFORMANCE DATA Input BTU/Hr 100, , , , , , , , , ,000 (kw) (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1) Output BTU/Hr 80, , , , , , , , , ,000 (kw) (23.4) (29.3) (35.1) (41.0) (46.9) (52.7) (58.6) (70.3) (82.0) (93.7) Thermal Efficiency (%) Free Air Delivery CFM 1,200 1,575 1,975 2,300 2,400 2,600 2,850 3,950 4,600 4,800 (cu. m/s) (0.566) (0.743) (0.932) (1.086) (1.133) (1.227) (1.345) (1.864) (2.171) (2.266) Air Temperature Rise Deg. F (Deg. C) (34) (33) (31) (31) (34) (36) (36) (31) (31) (34) Outlet Velocity FPM ,030 1, ,080 1,090 1,000 (m/s) (4.47) (4.83) (5.23) (5.31) (4.90) (4.75) (4.72) (5.49) (5.54) (5.08) Full Load Amps at 115V MOTOR DATA : Motor HP 1/4 1/3 1/2 1/2 3/4 3/4 3/4 3/4 1 1 Motor (kw) (0.19) (0.25) (0.37) (0.37) (0.56) (0.56) (0.56) (0.56) (0.75) (0.75) Motor Type SPH SPH SPH SPH SPH SPH SPH SPH cap.start cap.start R.P.M. 1,725 1,725 1,725 1,725 1,725 1,725 1,725 1,725 1,725 1, V DIMENSIONAL DATA in. (mm) A Height to Top of Unit 31-1/4 31-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 (794) (794) (921) (921) (921) (921) (921) (921) (921) (921) B Width of Unit 17-7/8 20-5/8 20-5/8 23-3/8 26-1/8 28-7/8 31-5/8 37-1/8 42-5/8 48-1/8 (454) (524) (524) (594) (664) (733) (803) (943) (1083) (1222) C Height to Top of Hanger 34-1/8 34-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8 39-1/8 (867) (867) (994) (994) (994) (994) (994) (994) (994) (994) D Depth to Rear of Housing 42-5/8 44-1/4 44-1/ / (1083) (1124) (1124) (1194) (1194) (1295) (1295) (1226) (1295) (1295) E Hanging Distance Width 14-1/2 17-1/4 17-1/ /4 25-1/2 28-1/4 33-3/4 39-1/4 44-3/4 (368) (438) (438) (508) (578) (648) (718) (857) (997) (1137) F Discharge Opening Width 15-3/8 18-1/8 18-1/8 20-7/8 23-5/8 26-3/8 29-1/8 34-5/8 40-1/8 45-5/8 (391) (460) (460) (530) (600) (670) (740) (879) (1019) (1159) J to Centerline of Flue 5-7/8 7-1/4 7-1/4 8-5/ /4 12-3/4 15-1/2 18-1/4 21 (149) (184) (184) (219) (254) (286) (324) (394) (464) (533) L Hanger Location 16-3/8 16-3/8 16-3/8 16-3/8 16-3/8 16-3/8 16-3/8 16-3/8 16-3/8 16-3/8 (416) (416) (416) (416) (416) (416) (416) (416) (416) (416) M Hanging Distance Depth 16-3/8 16-3/8 16-3/8 17-7/8 17-7/8 21-7/8 21-7/8 21-7/8 21-7/8 21-7/8 (416) (416) (416) (454) (454) (556) (556) (556) (556) (556) Flue Size Dia-in. * (Dia-mm) (102) (102) (102) (102) (127) (127) (127) (152) (152) (152) Blower Size-in (2) 10 (2) 12 (2) 12 Gas Inlet-Natural Gas-in. 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4 Gas Inlet-LP Gas-in. 1/2 1/2 1/2 1/2 1/2 1/2 OR 3/4 Approx. Shipping Wt. lb (kg) (119) (127) (142) (152) (165) (185) (194) (214) (254) (269) Ratings shown are for unit installations at elevations between 0 and 2000 ft. (610m). For unit installations in USA above 2000 ft. (610m), the unit input must be derated 4% for each 1000 ft. (305m) above sea level; refer to local codes, or in absence of local codes, refer to the latest edition of the National Fuel Gas Code ANSI Standard Z223.1 (N.F.P.A. No. 54). For installations in Canada, any references to deration at altitudes in excess of 2000 ft. (610m) are to be ignored. At altitudes of 2000 to 4500 ft. (610 to 1372m), the unit must be derated to 90% of the normal altitude rating, and be so marked in accordance with the ETL certification. LEGEND: SPH = SPLIT PHASE CAP. START = CAPACITOR START DIMENSIONS.XXX STANDARD UNITS DIMENSIONS IN PARENTHESIS (XXX) MILLIMETERS 7

8 QVSF SEPARATED COMBUSTION PROPELLER TYPE UNIT HEATER The Sterling Separated Combustion Propeller Type Unit Heater keeps energy costs down by offering 80% thermal efficiencies. With model inputs available from 100 thru 400 MBH, they are designed to be installed in mildly hostile environments where dusty, dirty and mildly corrosives exist or high humidity or slightly negative pressures prevail. The Sterling model QVSF propeller unit separates the combustion process from the environment where the unit is installed. A power venting system draws a controlled quantity of combustion air from outside the building. The same system exhausts flue gas products to the outside. The burners, pilot and flue system are enclosed within the unit. The entire combustion process is literally unaffected by the atmosphere in the space where the unit is located. Combustion and exhaust air may be piped horizontally through a side wall, or vertically through the roof via our standard 2 pipe venting arrangement or optional concentric vent kit which utilizes one 8" side wall or rooftop penetration for both the combustion and exhaust air. Both venting systems are ETL certified. TYPICAL INSTALLATIONS Industrial work areas with wood or textile dust Non-explosive contaminated environments Non-chlorine process areas Automotive and truck garages Greenhouses HEAT EXCHANGERS All heat exchangers feature 20 gauge tubes and 18 gauge headers and are available in 3 types of steel: Aluminized Steel (Standard) 409 Grade Steel Stainless Steel (Optional) 321 Grade Stainless Steel (Optional) BURNERS All sizes 100,000 thru 400,000 BTU/HR (29.3 thru kw) input are equipped with a proven design pressed steel burner having a unique shaded port protective device to prevent scale and debris from plugging the burner ports. LP/NATURAL OPERATION All units are available for operation on either natural or LP gas from our factory. 24 VOLT SYSTEM All units are equipped with a 24 volt control system which is powered by a 115/24 volt transformer as standard equipment. FAN TIME DELAY The fan time delay switch is mounted at the factory as standard equipment. This feature eliminates the initial blast of cold air by allowing the unit to fire for a short period of time prior to the actuating the fan motor. After the thermostat is satisfied (with burners off) the fan continues to operate for approximately 1 minute, removing residual heat from the heat exchanger. EASY ACCESS FOR MAINTENANCE The Sterling Separated Combustion Units are designed so that the bottom hinged access panel drops down for quick and easy burner inspection and removal. TEST FIRE All Sterling Unit Heaters are test fired to insure proper operation. 8

9 QVSF PERFORMANCE AND DIMENSIONAL DATA INTERTEK VERIFIED CM ENERGY PERFORMANCE VERIFIED RENDEMENT ENERGETIQUE VERIFIE Model QVSF Unit Size PERFORMANCE DATA Input BTU/Hr 100, , , , , , , , , ,000 (kw) (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1) Output BTU/Hr 80, , , , , , , , , ,000 (kw) (23.4) (29.3) (35.1) (41.0) (46.9) (52.7) (58.6) (70.3) (82.0) (93.7) Thermal Efficiency (%) Free Air Delivery CFM 1,480 1, ,530 2,640 2,700 3,100 4,400 5,000 5,300 (cu. m/s) (0.699) (0.779) (1.038) (1.194) (1.246) (1.274) (1.463) (2.077) (2.360) (2.502) Air Temperature Rise Deg. F (Deg. C) (28) (31) (28) (28) (31) (34) (33) (28) (29) (31) Outlet Velocity FPM (m/s) (3.9) (4.6) (5.3) (5.4) (5.1) (4.8) (5.0) (5.6) (5.8) (5.3) Full Load Amps at 115V MOTOR DATA: Motor HP 1/20 1/10 1/4 1/3 1/3 1/3 1/2 (2)1/4 (2)1/3 (2)1/3 Motor (kw) (0.037) (0.075) (0.186) (0.249) (0.249) (0.249) (0.373) (0.186) (0.249) (0.249) Motor Type SP SP PSC PSC PSC PSC PSC PSC PSC PSC R.P.M. 1,050 1,050 1,140 1,140 1,140 1,140 1,140 1,140 1,140 1, V DIMENSIONAL DATA in. (mm) A Height to Top of Unit 31-1/4 31-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 (794) (794) (921) (921) (921) (921) (921) (921) (921) (921) B Height to Top of Hanger 34-1/ / / / / / / / / /16 (865) (865) (992) (992) (992) (992) (992) (992) (992) (992) C Hanging Distance Width 14-3/4 17-1/2 17-1/2 20-1/ /4 28-1/ /2 45 (375) (445) (445) (514) (584) (654) (724) (864) (1003) (1143) D Discharge Opening Width 15-3/8 18-1/8 18-1/8 20-7/8 23-5/8 26-3/8 29-1/8 34-5/8 40-1/8 45-5/8 (391) (460) (460) (530) (600) (670) (740) (879) (1019) (1159) E Width of Unit 17-7/8 20-5/8 20-5/8 23-3/8 26-1/8 28-7/8 31-5/8 37-1/8 42-5/8 48-1/8 (454) (524) (524) (594) (664) (733) (803) (943) (1083) (1222) F to Centerline of Flue 5-7/8 7-1/4 7-1/4 8-5/ /4 12-3/4 15-1/2 18-1/4 21 (149) (184) (184) (219) (254) (286) (324) (394) (464) (533) Flue Size Dia-in.** (Dia mm) (102) (102) (102) (102) (127) (127) (127) (152) (152) (152) Air Inlet Size-in (mm) (102) (102) (102) (102) (127) (127) (127) (152) (152) (152) Fan Diameter-in Gas Inlet-Natural Gas-in. 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4 Gas Inlet-LP Gas-in. 1/2 1/2 1/2 1/2 1/2 1/2 or 3/4 Approx. Shipping Wt. lb (kg) (91) (103) (116) (129) (142) (154) (167) (196) (221) (247) Ratings shown are for unit installations at elevations between 0 and 2000 ft. (610m). For unit installations in USA above 2000 ft. (610m), the unit input must be derated 4% for each 1000 ft. (305m) above sea level; refer to local codes, or in absence of local codes, refer to the latest edition of the National Fuel Gas Code ANSI Standard Z223.1 (N.F.P.A. No. 54). For installations in Canada, any references to deration at altitudes in excess of 2000 ft. (610m) are to be ignored. At altitudes of 2000 to 4500 ft. (610 to 1372m), the unit must be derated to 90% of the normal altitude rating, and be so marked in accordance with the ETL certification. LEGEND: SPH = SPLIT PHASE PSC = PERMANENT SPLIT CAPACITOR DIMENSIONS.XXX STANDARD UNITS DIMENSIONS IN PARENTHESIS (XXX) MILLIMETERS 9

10 QVSB SEPARATED COMBUSTION BLOWER TYPE UNIT HEATER The Sterling Separated Combustion Blower Type Unit Heater keeps energy costs down by offering 80% thermal efficiencies. With model inputs available from 100 thru 400 MBH they are designed to be installed in mildly hostile environments where dusty, dirty and mildly corrosives exist or high humidity or slightly negative pressures prevail. The QVSB operates at a static pressure up to.2" W.C. and is available with a (standard) louvered or (optional) flanged outlet when discharge duct work is desired. The Sterling model QVSB blower unit separates the combustion process from the environment where the unit is installed. A power venting system draws a controlled quantity of combustion air from outside the building. The same system exhausts flue gas products to the outside. The burners, pilot and flue system are enclosed within the unit. The entire combustion process is literally unaffected by the atmosphere in the space where the unit is located. Combustion and exhaust air may be piped horizontally through a side wall, or vertically through the roof via our standard 2 pipe venting arrangement or optional concentric vent kit which utilizes one 8" side wall or rooftop penetration for both the combustion and exhaust air. Both venting systems are ETL certified. TYPICAL INSTALLATIONS Industrial work areas with wood or textile dust Non-explosive contaminated environments Non-chlorine process areas Automotive and truck garages Greenhouses BURNERS All sizes 100,000 thru 400,000 BTU/HR (29.3 thru kw) input are equipped with a proven design pressed steel burner having a unique shaded port protective device to prevent scale and debris from plugging the burner ports. LP/NATURAL OPERATION All units are available for operation on either natural or LP gas from our factory. 24 VOLT SYSTEM All units are equipped with a 24 volt control system which is powered by a 115/24 volt transformer as standard equipment. FAN TIME DELAY The fan time delay switch is mounted at the factory as standard equipment. This feature eliminates the initial blast of cold air by allowing the unit to fire for a short period of time prior to the actuating the fan motor. After the thermostat is satisfied (with burners off) the fan continues to operate for approximately 1 minute, removing residual heat from the heat exchanger. EASY ACCESS FOR MAINTENANCE The Sterling Separated Combustion Units are designed so that the bottom hinged access panel drops down for quick and easy burner inspection and removal. TEST FIRE All Sterling Unit Heaters are test fired to insure proper operation. HEAT EXCHANGERS All heat exchangers feature 20 gauge tubes and 18 gauge headers and are available in 3 types of steel: Aluminized Steel (Standard) 409 Grade Steel Stainless Steel (Optional) 321 Grade Stainless Steel (Optional) 10

11 QVSB PERFORMANCE AND DIMENSIONAL DATA INTERTEK VERIFIED CM ENERGY PERFORMANCE VERIFIED RENDEMENT ENERGETIQUE VERIFIE Model QVSB Unit Size PERFORMANCE DATA Input BTU/Hr 100, , , , , , , , , ,000 (kw) (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1) Output BTU/Hr 80, , , , , , , , , ,000 (kw) (23.4) (29.3) (35.1) (41.0) (46.9) (52.7) (58.6) (70.3) (82.0) (93.7) Thermal Efficiency (%) Free Air Delivery CFM 1,200 1,575 1,975 2,300 2,400 2,600 2,850 3,950 4,600 4,800 (cu. m/s) (0.566) (0.743) (0.932) (1.086) (1.133) (1.227) (1.345) (1.864) (2.171) (2.266) Air Temperature Rise Deg. F (Deg. C) (34) (33) (31) (31) (34) (36) (36) (31) (31) (34) Outlet Velocity FPM (m/s) (4.47) (4.83) (5.23) (5.31) (4.90) (4.75) (4.72) (5.49) (5.54) (5.08) Full Load Amps at 115V MOTOR DATA: Motor HP 1/4 1/3 1/2 1/2 3/4 3/4 3/4 3/4 1 1 Motor (kw) (0.19) (0.25) (0.37) (0.37) (0.56) (0.56) (0.56) (0.56) (0.75) (0.75) Motor Type SPH SPH SPH SPH SPH SPH SPH SPH cap.start cap.start R.P.M V DIMENSIONAL DATA in. (mm) A Height to Top of Unit 31-1/4 31-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 (794) (794) (921) (921) (921) (921) (921) (921) (921) (921) B Height to Top of Hanger 34-1/ / / / / / / / / /16 (865) (865) (992) (992) (992) (992) (992) (992) (992) (992) C Hanging Distance Width 14-3/4 17-1/2 17-1/2 20-1/ /4 28-1/ /2 45 (375) (444) (444) (514) (584) (654) (724) (864) (1003) (1143) D Discharge Opening Width 15-3/8 18-1/8 18-1/8 20-7/8 23-5/8 26-3/8 29-1/8 34-5/8 40-1/8 45-5/8 (391) (460) (460) (530) (600) (670) (740) (879) (1019) (1159) E Width of Unit 17-7/8 20-5/8 20-5/8 23-3/8 26-1/8 28-7/8 31-5/8 37-1/8 42-5/8 48-1/8 (454) (524) (524) (594) (664) (733) (803) (943) (1083) (1222) F to Centerline of Flue 5-7/8 7-1/4 7-1/4 8-5/ /4 12-3/4 15-1/2 18-1/4 21 (149) (184) (184) (219) (254) (286) (324) (394) (464) (533) G Hanging Distance Depth 18-1/2 18-1/2 18-1/ (470) (470) (470) (508) (508) (584) (584) (584) (584) (584) H Depth to Rear of Housing 42-3/4 44-3/8 44-3/8 47-3/ / / /8 50-7/8 51 (1086) (1127) (1127) (1199) (1199) (1292) (1219) (1292) (1292) (1295) Flue Size Dia-in.** (Dia-mm) (102) (102) (102) (102) (127) (127) (127) (152) (152) (152) Air Inlet Size-in (mm) (102) (102) (102) (102) (127) (127) (127) (152) (152) (152) Blower Size-in (2)10 (2)12 (2)12 Gas Inlet-Natural Gas-in. 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4 Gas Inlet-LP Gas-in. 1/2 1/2 1/2 1/2 1/2 1/2 or 3/4 Approx. Shipping Wt. lb (kg) (135) (150) (164) (179) (193) (208) (222) (253) (280) (308) Ratings shown are for unit installations at elevations between 0 and 2000 ft. (610m). For unit installations in USA above 2000 ft. (610m), the unit input must be derated 4% for each 1000 ft. (305m) above sea level; refer to local codes, or in absence of local codes, refer to the latest edition of the National Fuel Gas Code ANSI Standard Z223.1 (N.F.P.A. No. 54). For installations in Canada, any references to deration at altitudes in excess of 2000 ft. (610m) are to be ignored. At altitudes of 2000 to 4500 ft. (610 to 1372m), the unit must be derated to 90% of the normal altitude rating, and be so marked in accordance with the ETL certification. LEGEND: SPH = SPLIT PHASE CAP. START = CAPACITOR START DIMENSIONS.XXX STANDARD UNITS DIMENSIONS IN PARENTHESIS (XXX) MILLIMETERS 11

12 INDOOR DUCT FURNACE Sterling Indoor Duct Furnaces are 80% efficient and are designed for ducted air applications. These are typically built up systems using a separate air moving device and may be heating only or heating and air conditioning applications. All Sterling duct furnaces are ETL certified for installation upstream or downstream from cooling coils (stainless steel heat exchangers are recommended). HEAT EXCHANGERS All heat exchangers feature 20 gauge tubes and 18 gauge headers and are available in 3 types of steel: Aluminized Steel (Standard) 409 Grade Stainless Steel (Optional) 321 Grade Stainless Steel (Optional) We recommend stainless steel for applications where entering air is below 40 F. (4.4 C.) and/or duct furnaces are located downstream from cooling coils. AVAILABLE MODELS All models are offered in 10 capacities from 100,000 to 400,000 BTU/HR (29.3 thru kw). All models are test fired at our factory, may be ordered equipped for LP or natural gas, are tested to operate against 2.0 inches (0.5 kpa) water column pressure and may be ordered with right (std.) or left hand (opt.) control access. MODEL QVED The QVED model features integral power venting, sealed flue collecter and electronic spark ignition. Annual fuel savings and seasonal efficiency are increased while reducing installation time. Unit has bottom access for burner servicing. Certified by ETL and approved for use in Canada. MODEL QVES Offering the same features as the QVED except that the QVES has a side access burner drawer which slides out for servicing, reducing bottom clearance requirements. MODEL QVES 12

13 DETAILS AND DIMENSIONS QVED Power Vented Duct Furnace Bottom Service Acccess Power Vented Duct Furnace (QVED/QVES) UNIT A B C D (Dia)* F GAS INLET WEIGHT SIZE in. in. in. in. in. in. lb. (mm) (mm) (mm) (mm) (mm) NAT. LP (kg) /8 15-1/2 17-1/ /8 1/2 1/2 173 (454) (394) (435) (102) (606) (78) /8 18-1/4 19-7/ /8 1/2 1/2 186 (524) (464) (505) (102) (651) (84) /8 18-1/4 19-7/ /8 1/2 1/2 197 (524) (464) (505) (102) (676) (89) / / /8 1/2 1/2 216 (594) (533) (575) (102) (746) (98) /8 23-3/4 25-3/ /8 1/2 1/2 232 (664) (603) (645) (127) (816) (105) /8 26-1/2 28-1/ /8 3/4 1/2 OR 3/4 254 (733) (673) (714) (127) (886) (115) /8 29-1/4 30-7/ /8 3/4 1/2 OR 3/4 263 (803) (743) (784) (127) (956) (119) /8 34-3/4 36-3/ /8 3/4 1/2 OR 3/4 312 (943) (883) (924) (152) (1095) (142) /8 40-1/4 41-7/ /8 3/4 1/2 OR 3/4 389 (1083) (1022) (1064) (152) (1235) (176) /8 45-3/4 47-3/ /8 3/4 1/2 OR 3/4 403 (1222) (1162) (1203) (152) (1375) (183) QVES Power Vented Duct Furnace Side Service Access 13

14 DUCT FURNACE PERFORMANCE DATA INPUT OUTPUT (MAX) (MIN) MIN. Temp. Rise P.D. MAX. Temp. Rise P.D. UNIT MBH MBH MBH CFM Deg. F. in. of W.C. CFM Deg. F. in. of W.C. SIZE (kw) (kw) (kw) (cu. m/s) (Deg. C.) (kpa) (cu. m/s) (Deg. C.) (Pascals) (29.3) (14.6) (23.4) (0.438) (44) (0.03) (1.165) (17) (0.22) (36.6) (18.3) (29.3) (0.546) (44) (0.03) (1.457) (17) (0.20) (43.9) (22.0) (35.1) (0.656) (44) (0.04) (1.748) (17) (0.19) (51.2) (25.6) (41.0) (0.765) (44) (0.03) (2.040) (17) (0.19) (58.6) (29.3) (46.9) (0.874) (44) (0.03) (2.331) (17) (0.19) (65.9) (32.9) (52.7) (0.983) (44) (0.03) (2.622) (17) (0.19) (73.2) (36.6) (58.6) (1.093) (44) (0.03) (2.914) (17) (0.20) (87.8) (43.9) (70.3) (1.311) (44) (0.03) (3.496) (17) (0.22) (102.5) (51.2) (82.0) (1.530) (44) (0.03) (4.079) (17) (0.22) (117.1) (58.6) (93.7) (1.748) (44) (0.03) (4.662) (17) (0.22) NOTE: Ratings shown are for unit installations at elevations between 0 and 2000 ft. (610m). For unit installations in USA above 2000 ft. (610m), the unit input must be derated 4% for each 1000 ft. (305m) above sea level; refer to local codes, or in absence of local codes, refer to the National Fuel Gas Code, the latest edition of ANSI Standard Z223.1 (N.F.P.A. No. 54). For installations in Canada, any references to deration at altitudes in excess of 2000 ft. (610m) are to be ignored. At altitudes of 2000 to 4500 ft. (610 to 1372m), the unit must be derated to 90% of the normal altitude rating, and be so marked in accordance with the ETL certification. TEMPERATURE RISE AND PRESSURE DROP GRAPH 14

15 QVSD SEPARATED COMBUSTION INDOOR DUCT FURNACE Sterling Separated Combustion Indoor Duct Furnace is designed for installation in mildly hostile environments. The Separated Combustion Duct Furnace is available in sizes ranging from 100 to 400 MBTU (29.3 to kw) inputs and offers a variety of optional equipment. APPLICATIONS The QVSD Separated Combustion Duct Furnace is designed to be installed in dusty, dirty or mildly corrosive environments, or where high humidity or slightly negative pressures exist. Ideal applications include HVAC equipment rooms, manufacturing facilities, automotive garages and greenhouses. DESCRIPTIONS The QVSD Combustion Duct Furnace separates the combustion process from the environment where the unit is installed. A power venting system draws controlled amount of combustion air from outside of the building. The same system exhausts the flue gases to the outside. The burners, pilot and flue system are totally enclosed within the unit, thus the entire combustion process is literally unaffected by the atmosphere in the space where the Duct Furnace is located. ADDITIONAL FEATURES ETL certified as 80% efficient. Unit s interior components fully accessible via bottom access door. Factory equipped with an electronic spark ignition system. Rugged 20 gauge heat exchanger and jacketry. Available in both right or left hand control access configurations. 2 styles of ETL approved venting systems: two pipe or concentric. Two pipe system allows for two (4", 5" or 6") individual building terminations. The concentric adapter kit utilizes one 8" termination in which both the flue gas and combustion air passes. All models are equipped with electronic spark ignition (100% safety shutoff on LP models), 115 volt power, vent system pressure switch, high limit switch and 24 volt control transformer. All models are factory assembled with a horizontal flue discharge position. A vertical flue position may be altered in the field. All models must be vented utilizing our certified standard two-pipe method or optional concentric adaptor kit. CAUTIONS Combustion air and vent systems must be installed in accordance with National Fuel Gas Code or Installation Code for Natural Gas Burning Appliances and Equipment (Canada). Local and State authorities should also be consulted to determine their requirements. Units should not be installed where negative pressures are significant. Units should not be installed where vapors containing chlorine or fluorine may be present. Care should be taken not to draw combustion air from or near a contaminated environment. Units should not be installed in areas classified as hazardous. SPECIFICATION GUIDE - MODEL QVSD Sterling Model QVSD Separated Combustion Duct Furnaces are completely factory assembled, piped, wired and test fired. All models are ETL certified as having 80% thermal efficiency. This certification includes operation on either natural of LP (propane) gas. All models conform to the latest ANSI Standards for safe operation. Casings are die-formed 20-gauge bonderized steel, finished in baked enamel. Heat exchangers consist of 20-gauge tubes and 18-gauge headers. Heat exchangers are available in aluminized steel, 409 stainless steel and type 321 stainless steel. Burners are individually removable, die-formed and feature stainless steel port protectors. Burners are available in aluminized or type 409 stainless steel. 15

16 DETAILS AND DIMENSIONS Separated Combustion Indoor Duct Furnace (QVSD) UNIT A B C D (Dia)* GAS INLET WEIGHT SIZE in. in. in. in. in. lb. (mm) (mm) (mm) (mm) NAT. LP (kg) /8 15-1/2 17-1/8 4 1/2 1/2 161 (454) (394) (435) (102) (73) /8 18-1/4 19-7/8 4 1/2 1/2 180 (524) (464) (505) (102) (82) /8 18-1/4 19-7/8 4 1/2 1/2 188 (524) (464) (505) (102) (85) / /8 4 1/2 1/2 207 (594) (533) (575) (102) (93) /8 23-3/4 25-3/8 5 1/2 1/2 227 (664) (603) (645) (127) (103) /8 26-1/2 28-1/8 5 3/4 1/2 OR 3/4 246 (733) (673) (714) (127) (116) /8 29-1/4 30-7/8 5 3/4 1/2 OR 3/4 266 (803) (743) (784) (127) (121) /8 34-3/4 36-3/8 6 3/4 1/2 OR 3/4 305 (943) (883) (924) (152) (138) /8 40-1/4 41-7/8 6 3/4 1/2 OR 3/4 344 (1083) (1022) (1064) (152) (156) /8 45-3/4 47-3/8 6 3/4 1/2 OR 3/4 383 (1222) (1162) (1203) (152) (174) NOTE: D diameter equals the air inlet opening and the flue discharge opening. QVSD Separated Combustion Duct Furnace Bottom Service Access Only DIMENSIONS XXX STANDARD UNITS DIMENSIONS IN PARENTHESIS (XXX) MILLIMETERS 16

17 SEPARATED COMBUSTION DUCT FURNACE PERFORMANCE DATA INPUT OUTPUT (MAX) (MIN) MIN. Temp. Rise P.D. MAX. Temp. Rise P.D. UNIT MBH MBH MBH CFM Deg. F. in. of W.C. CFM Deg. F. in. of W.C. SIZE (kw) (kw) (kw) (cu. m/s) (Deg. C.) (kpa) (cu. m/s) (Deg. C.) (Pascals) (29.3) (14.6) (23.4) (0.388) (50) (0.20) (1.746) (11) (0.51) (36.6) (18.3) (29.3) (0.485) (50) (0.20) (2.183) (11) (0.48) (43.9) (22.0) (35.1) (0.582) (50) (0.20) (2.620) (11) (0.45) (51.2) (25.6) (41.0) (0.679) (50) (0.20) (3.056) (11) (0.46) (58.6) (29.3) (46.9) (0.776) (50) (0.20) (3.493) (11) (0.47) (65.9) (32.9) (52.7) (0.873) (50) (0.20) (3.930) (11) (0.48) (73.2) (36.6) (58.6) (0.097) (50) (0.20) (4.366) (11) (0.49) , (87.8) (43.9) (70.3) (1.164) (50) (0.20) (5.240) (11) (0.50) , (102.5) (51.2) (82.0) (1.358) (50) (0.20) (6.113) (11) (0.50) , (117.1) (58.6) (93.7) (1.552) (50) (0.20) (6.986) (11) (0.51) NOTE: Ratings shown are for unit installations at elevations between 0 and 2000 ft. (610m). For unit installations in USA above 2000 ft. (610m), the unit input must be derated 4% for each 1000 ft. (305m) above sea level; refer to local codes, or in absence of local codes, refer to the National Fuel Gas Code, the latest edition of ANSI Standard Z223.1 (N.F.P.A. No. 54). For installations in Canada, any references to deration at altitudes in excess of 2000 ft. (610m) are to be ignored. At altitudes of 2000 to 4500 ft. (610 to 1372m), the unit must be derated to 90% of the normal altitude rating, and be so marked in accordance with the ETL certification. TEMPERATURE RISE AND PRESSURE DROP GRAPH 17

18 CABINET BLOWERS (CAB 1 THRU 4) STERLING OFFERS THESE QUALITY FEATURES AS STANDARD EQUIPMENT Sterling Cabinet Blowers have been specially designed for air handling systems of high static pressure in combination with Sterling Duct Furnaces. The cabinet blowers have been matched against the proper furnace size for greatest efficiency of operation. Removable side panels for inspection, servicing and motor maintenance. Motor and drive shall be furnished by the factory and shipped fully mounted to the floor of the unit so that field mounting is not required. A connecting transition duct between blower and duct furnace is furnished as standard equipment when a specific furnace capacity is chosen (Digits 5, 6 & 7). Four sizes provide cfm capacities ranging from 1250 to 8000 cfm (0.59 to 3.78m 3 /s). CABINET BLOWER MODEL NUMBER DESCRIPTION Digit C X X X Item Prefix UT CA SV MT MS AS (Internal Use Only) Digit # 1, 2, 3, 4 - Unit Type [UT] CAB1 - Cabinet Blower Size 1 CAB2 - Cabinet Blower Size 2 CAB3 - Cabinet Blower Size 3 CAB4 - Cabinet Blower Size 4 Digit # 5, 6, 7 - Furnace Capacity [CA]* ,000 BTU/HR ,000 BTU/HR ,000 BTU/HR ,000 BTU/HR ,000 BTU/HR ,000 BTU/HR ,000 BTU/HR ,000 BTU/HR ,000 BTU/HR ,000 BTU/HR No Transition Required * Indicates transition duct size needed for corresponding QVED or QVES Duct Furnace. Refer to Compatable Duct Furnace Size indicated in the table on page 19. Digit #8 - Supply Voltage [SV] 1-115/1/ /3/ /1/ /3/ /1/ /3/ /3/60 Z - Other Digit #9 - Motor Type [MT] 1 - Open Drip Proof 2 - Totally Enclosed 3 - Premium Efficiency, Open Drip Proof 4 - Premium Efficiency, Totally Enclosed Digit #10 - Blower Motor Sizes [MS] B - 1/3 HP. w /Contactor K - 1/3 HP. C - 1/2 HP. w/contactor L - 1/2 HP. D - 3/4 HP. w/contactor M - 3/4 HP. F - 1 HP. w/contactor N - 1 HP. G - 1-1/2 HP. w/contactor H - 2 HP. w/contactor P - 3 HP. w/contactor MOTOR DATA Digit #11 - Accessories [AS] All Accessories are to be entered as a separate line item using new catalog number which utilizes AS as a prefix. i.e: F1 becomes AS-F1. FACTORY INSTALLED FIELD INSTALLED (AS- ) B1-1" Washable Filters F1-1-Stage T675A Ductstat B2-2" Washable Filters F2-2-Stage T678A Ductstat B3-2" Throwaway Filters B6-1" Throwaway Filters G1-1-Stage T87K Mercury Free Thermostat w/subase P4 - Terminal Block Wiring G2-1-Stage T87K Mercury Free Thermostat w/tg511a Guard Y5 - Cabinet Insulation G3-1-Stage T834N Mercury Free Y6 - Transition Insulation Thermostat/Fan Switch G5-2-Stage TH5220D Mercury Free Thermostat w/subbase G6 - Locking Thermostat Cover G8-1-Stage T6169C Line Voltage Stat/Subbase G9-1-Stage T822K Mercury Free Thermostat CURRENT 1/3 H.P. 1/2 H.P. 3/4 H.P. 1 H.P. 1-1/2 H.P. 2 H.P. 3 H.P. CHARACTERISTICS R.P.M. AMPS R.P.M. AMPS R.P.M. AMPS R.P.M. AMPS R.P.M. AMPS R.P.M. AMPS R.P.M. AMPS / Approx. Ship Wt. 16# 21# 25# 31# 41# 44# /230/ Approx. Ship Wt. MOTOR FRAME MUST NOT EXCEED NEMA SIZE # 28# 31# 41# 41# 43# 18

19 CABINET BLOWER DIMENSION DATA A B C D E F G APPR. SHIP WT. MODEL in. in. in. in. in. in. in. FILTER DATA FILTER LESS MOTOR NO. * (mm) (mm) (mm) (mm) (mm) (mm) (mm) SIZE ** REQ D. LB (KG) CAB-1/ / /4 15-3/4 15-5/8 25 X 25 X (1664) (660) (254) (457) (540) (400) (397) (61) CAB-1/ / /4 15-3/4 18-3/8 25 X 25 X (1664) (660) (254) (457) (540) (400) (467) (61) CAB-2/ / /4 15-3/4 18-3/8 25 X 25 X (1664) (660) (254) (457) (540) (400) (467) (70) CAB-2/ / /4 15-3/4 21-1/8 25 X 25 X (1664) (660) (254) (457) (540) (400) (537) (70) CAB-3/ /2 40-1/ /4 30-3/8 23-7/8 25 X 20 X (1664) (1029) (254) (457) (908) (772) (606) (91) CAB-3/ /2 40-1/ /4 30-3/8 26-5/8 25 X 20 X (1664) (1029) (254) (457) (908) (772) (676) (91) CAB-3/ /2 40-1/ /4 30-3/8 29-3/8 25 X 20 X (1664) (1029) (254) (457) (908) (772) (746) (91) CAB-4/ /2 60-1/ /4 50-3/8 34-7/8 25 X 20 X (1664) (1537) (254) (457) (1416) (1280) (886) (134) CAB-4/ /2 60-1/ /4 50-3/8 40-3/8 25 X 20 X (1765) (1537) (356) (559) (1416) (1280) (1026) (134) CAB-4/ /2 60-1/ /4 50-3/8 45-7/8 25 X 20 X (1765) (1537) (356) (559) (1416) (1280) (1165) (134) *Never use a single cabinet blower to handle more than one duct furnace. CAB-4 has two blowers driven by one motor. **Standard filters are 1'' thick throw away type. Optional 2'' thick filters are available. Side panels removable for inspection, servicing and motor maintenance cabinet painted gray enamel. Sterling reserves the right to change specifications without incurring obligations. Cabinet blower units are not certified by ETL. 19

20 CABINET BLOWER PERFORMANCE DATA Total Static Pressure * in. of W.C DUCT FURNACE SECTIONS (kpa) (0.05) (0.07) (0.10) (0.12) (0.15) (0.17) (0.20) (0.22) PRESSURE DROP MODEL CFM RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP RPM HP SIZE in. W.C. SIZE in. W.C. (cu. m/s) (kw) (kw) (kw) (kw) (kw) (kw) (kw) (kw) (kpa) (kpa) 1, / / / / / / (0.590) (0.25) (0.25) (0.25) (0.25) (0.25) (0.25) (0.04) 1, / / / / / / CAB 1 (0.590) (0.25) (0.25) (0.25) (0.25) (0.25) (0.25) (0.02) 10 1, / / / / / / / / BLOWER (0.708) (0.25) (0.25) (0.25) (0.25) (0.37) (0.37) (0.37) (0.37) (0.04) 1, / / / / / / / / (0.826) (0.25) (0.25) (0.37) (0.37) (0.37) (0.37) (0.56) (0.56) (0.04) 2, / / / / / / /4 1,010 3/ (0.944) (0.37) (0.37) (0.37) (0.37) (0.37) (0.56) (0.56) (0.56) (0.06) 1, / / / / (0.708) (0.25) (0.25) (0.25) (0.25) (0.02) (0.02) 1, / / / / / / (0.826) (0.25) (0.25) (0.25) (0.37) (0.37) (0.37) (0.04) (0.03) CAB 2 2, / / / / / / / / (0.944) (0.25) (0.25) (0.37) (0.37) (0.37) (0.37) (0.37) (0.56) (0.05) (0.03) BLOWER 2, / / / / / / / / (1.062) (0.37) (0.37) (0.37) (0.37) (0.56) (0.56) (0.56) (0.56) (0.04) 2, / / / / / / / / (1.180) (0.37) (0.37) (0.37) (0.37) (0.56) (0.56) (0.56) (0.56) (0.05) 2, / / / / / / / (1.298) (0.37) (0.37) (0.56) (0.56) (0.56) (0.56) (0.56) (0.75) (0.07) 1, / / / / / / (0.826) (0.25) (0.25) (0.25) (0.25) (0.37) (0.37) (0.02) 2, / / / / / / / / (0.944) (0.25) (0.25) (0.37) (0.37) (0.37) (0.37) (0.37) (0.56) (0.03) (0.02) 2, / / / / / / / / (1.062) (0.37) (0.37) (0.37) (0.37) (0.37) (0.56) (0.56) (0.56) (0.03) (0.03) 2, / / / / / / / / (1.180) (0.37) (0.37) (0.37) (0.37) (0.56) (0.56) (0.56) (0.56) (0.04) (0.03) 2, / / / / / / / CAB 3 (1.298) (0.37) (0.37) (0.56) (0.56) (0.56) (0.56) (0.56) (0.75) (0.05) (0.03) 12 3, / / / / BLOWER (1.416) (0.37) (0.56) (0.56) (0.56) (0.75) (0.75) (0.75) (0.75) (0.05) (0.04) 2, / / / / / / / / (1.062) (0.37) (0.37) (0.37) (0.37) (0.37) (0.37) (0.56) (0.56) (0.02) 2, / / / / / / / / (1.180) (0.37) (0.37) (0.37) (0.37) (0.56) (0.56) (0.56) (0.56) (0.03) 2, / / / / / / / / (1.298) (0.37) (0.37) (0.56) (0.56) (0.56) (0.56) (0.56) (0.56) (0.03) 3, / / / / / (1.416) (0.56) (0.56) (0.56) (0.56) (0.56) (0.75) (0.75) (0.75) (0.03) 3, / / (1.534) (0.56) (0.56) (0.75) (0.75) (0.75) (0.75) (0.75) (0.75) (0.04) 3, / / / / (1.652) (0.56) (0.75) (0.75) (0.75) (0.75) (1.12) (1.12) (1.12) (0.05) 2, / / / (1.298) (0.56) (0.56) (0.56) (0.02) 3, / / / / / (1.416) (0.56) (0.56) (0.56) (0.56) (0.56) (0.02) 3, / / / / / (1.652) (0.56) (0.56) (0.56) (0.56) (0.56) (0.75) (0.75) (0.03) (0.02) 4, / / / / (1.888) (0.56) (0.56) (0.56) (0.56) (0.75) (0.75) (0.75) (0.75) (0.04) (0.03) 4, / / / / (2.124) (0.56) (0.56) (0.56) (0.75) (0.75) (0.75) (0.75) (1.12) (0.04) (0.03) 5, / / / / / (2.360) (0.56) (0.56) (0.75) (0.75) (0.75) (1.12) (1.12) (1.12) (0.05) (0.04) 5, / / / / / CAB 4 (2.596) (0.75) (0.75) (0.75) (1.12) (1.12) (1.12) (1.12) (1.12) (0.06) (0.05) (2) 12 6, / / / / / BLOWERS (2.832) (1.12) (1.12) (1.12) (1.12) (1.12) (1.49) (1.49) (1.49) (0.06) (0.06) 6, / (3.068) (1.12) (1.49) (1.49) (1.49) (1.49) (1.49) (2.24) (2.24) (0.07) (0.06) 7, / NA (3.304) (1.12) (1.49) (1.49) (1.49) (2.24) (2.24) (2.24) (0.07) 7, NA NA NA (3.540) (1.49) (1.49) (2.24) (2.24) (2.24) (0.07) 8, NA NA NA NA NA (3.776) (1.49) (2.24) (2.24) (0.08) *External static pressure in inches of W.C. Add the pressure drop of the duct furnace and the pressure drop of the ductwork to determine the total external static pressure. 20

21 GENERAL INFORMATION SOUND RATINGS The individual unit s Performance Data includes sound ratings. The ratings provide a guide in determining the acceptable degree of loudness in particular occupancy situations. Certain general rules apply to specific selection of unit heaters with regard to degree of quietness (or loudness): The greater the fan diameter, the higher the sound level. The higher the motor RPM, the higher the sound level. Note that on most units the lower the speed mode results in lowering the sound rating one increment. Selecting a larger number of smaller units generally results in lower overall noise levels than fewer large units All Sterling unit heater motors are isolated from the mechanical mount by resilient isolators. This mounting along with four balanced fan blades and excellent overall construction integrity, assures you the utmost in quiet operation. The following table outlines sound rating for various application. The lower the number, the quieter the unit and lower the sound requirement. SOUND CATEGORY OF AREA RATING Apartments, assembly hall, I classrooms, churches, courtrooms, executives offices, hospitals, libraries, museums, theatres. Dining rooms, general office, II Recreations areas, small retail stores. Restaurants, banks, cafeterias, III department stores, public buildings, service stations. Gymnasiums, health clubs IV laundromats, supermarkets. Garages, small machine shops, V light manufacturing. Factories, foundries, steel mills III-VII** **Depending on specific use in these facilities, size of operation, etc. Altitude Above Sea Level Ft. (m) Gas Heating Input (Actual) Blower RPM (Req'd) Blower BHP (Req'd) GAS HEATING VALUE The standard gross heating value for natural gas is 1075 BTU/HR per cubic foot (40.1 MJ/m 3 ). Propane gas has a gross heating value of 2500 BTU/HR per cubic foot (93.1 MJ/m 3 ). When selecting equipment, you should take into account, variations from standard values (heat content varies by type and location). To account for variations in gross heating values (of fuel) you should adjust the total heat input required and select the equipment based on the adjusted load with the following formula. ADJUSTED LOAD = Calculated Load x Standard Gross Ht. Value [(BTU/HR)/Cu. Ft.] Actual Gross Ht. Value [(BTU/HR) Cu.Ft.] CORRECTION FACTORS FOR HIGH ALTITUDE INSTALLATIONS* 2000' (610m) ' (915m) ' (1220m) *Multiply standard unit by correction factor to get actual input and required RPM and HP. In Canada derate 10% for altitudes 2000 to 4500 feet (610 to 1372m). DUCT FURNACES The duct furnace design is certified by ETL for use with natural and LP (propane) gases. ANSI and NFPA Standards referred to in this manual are the ones that were applicable at the time the design was certified. In addition, the duct furnaces may be installed on the downstream side of a cooling unit, without need of a bypass duct. (Stainless steel heat exchangers are recommended.) 5000' (1525m) ' (1830m) ' (2135m) UNIT HEATERS AND DUCT FURNACES (U.S.A. Installations) The installation must conform with local building codes or, in absence of local codes, with the National Fuel Gas Code, the latest edition of ANSI Z223.1 (NFPA No. 54). Installation in aircraft hangars must be in accordance with current ANSI/ NFPA no. 409, Standard for aircraft Hangars. Those in repair garages should be in accordance with current ANSI/NFPA no. 88A, Standard for Parking Structure or with current ANSI/NFPA no. 88B, Standard for Parking Structure or with ANSI/NFPA no. 88B, Standard for Repair Garages. *If the unit is to be installed at an altitude exceeding 2,000 feet (610m) above sea level, derate the input by 4% for each 1,000 foot (305m) rise above sea level. Special orifices are required for installation above 2,000 feet (610m), (unless the gas lines are already derated; verify this information with your utility company and inform customer service on the order. (Canadian Installations) Units installed in Canada must conform with local building codes, or in absence of local building codes, with CSA-B149.1 Installation Codes for Natural Gas Burning Appliances and Equipment or CSA-B149.2 Installation Codes for Propane Gas Burning Appliances and Equipment. These units have been designed and certified to comply with CSA 2.6. For installations in Canada, any references to deration at altitudes in excess of 2,000 feet (610m) are to be ignored. At altitudes of 2,000 to 4,500 feet (610 to 1372m), the unit must be derated to 90% of the normal altitude rating, and be so marked in accordance with ETL certification. 21

22 APPLICATIONS UNIT HEATER PLACEMENT Gas-fired unit heaters are used primarily in commercial and industrial buildings such as warehouses, manufacturing areas, garages, showrooms, lobbies, etc. Placement is typically determined by air distribution requirements. Proper distributions should have air directed toward areas of greatest heat loss. Multiple units may be used to greatest effect by positioning units around the perimeter. Several units near the center and with air discharging toward outside walls may also satisfy the heating requirements. Direct air discharge on occupants should be avoided. TYPICAL APPLICATIONS A large square area with exposed walls and roof; units are blanketing all exposed surfaces. A narrow area with four exposed walls either with or without roof exposure. HOW TO CALCULATE HEAT LOSS It is suggested that when calculating heat loss for a building, reference be made to procedures outlined in the ASHRAE Handbook. As an easy reference, however, the following abbreviated method may be used with a good degree of reliability. 1. Determine inside temperature to be maintained and the design outside temperature for your locality. The difference between these two figures is the design temperature difference. 2. Calculate net areas in square feet of glass, wall, floor, and roof exposed to outside temperature or unheated spaces. Calculate door as all glass. 3. Select heat-transfer coefficients from the table below (or the ASHRAE Handbook) and compute the heat-transmission loss for each area in BTU/HR by multiplying each area by the heat-transfer coefficient and the temperature difference. 4. Add 10% to the heat-loss figures for areas exposed to prevailing winds. 5. Calculate the volume of the room or area in cubic feet and multiply by the estimated number of air changes per hour due to infiltration (usually from one to two). Determine the number of cubic feet per hour of air exhausted by ventilating fans or industrial processes. Substitute the larger of these two figures in the formula to determine the heat required to raise the air from outside to room temperature BTU/HR = cubic feet per hour x temperature difference The totals of BTU/HR losses from 3, 4 and 5 (above) will give the total BTU/HR to be supplied by unit heaters. (Note: If processes performed in the room liberate considerable amounts of heat, this may be determined as accurately as possible and subtracted from the total). "U" Building Material Factor WALLS Poured concrete 80#/cu. ft. 8-inch inch Concrete Block, hollow cinder aggregate 8-inch inch Gravel aggregate 8-inch inch Concrete Block, w/4-inch facebrick Gravel, 8-inch Cinder, 8-inch Metal (un-insulated) w/1-inch blanket insulation w/3-inch blanket insulation ROOFING Corrugated Metal (un-insulated) w/1-inch bolt or blanket w/1 1 / 2 -inch bolt or blanket w/3-inch bolt or blanket Flat Metal w/ 3 / 8 -inch built-up roofing w/1-inch blanket insulation under deck w/2-inch blanket insulation under deck Wood/ 1" / (un-insulated) w/ 3 / 8 -inch built-up roofing w/1-inch blanket insulation Wood/ 2" / (un-insulated) w/ 3 / 8 -inch built-up roofing w/1-inch blanket insulation Concrete slab/ 2" / (un-insulated) w/ 3 / 8 -inch built-up roofing w/1-inch insulation board Concrete slab/ 3" / (un-insulated) w/ 3 / 8 -inch built-up roofing w/1-inch insulation board Gypsum slab/ 2" / (un-insulated) w/ 1 / 2 -inch gypsum board w/1-inch insulation board Gypsum slab/ 3" / (Un-insulated) w/ 1 / 2 -inch gypsum board w/1-inch insulation board WINDOWS Vertical, single-glass Vertical, double-glass, 3 / 16 - inch air space Horizontal, single-glass (sky light) 1.40 DOORS Metal single sheet Wood, 1-inch inch A small area with exposed walls requiring one unit. 22

23 HEAT THROW DATA STANDARD UNIT HEATER APPLICATIONS Approximate Distance of Heat Throw (Feet) Distance From UNIT SIZE BTU/Hr (kw) Floor to Bottom 100, , , , , , , , , ,000 of Unit H (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1) ft. (m) Approximate Distance of Heat Throw - Feet (Meters) (2.4) (18.3) (19.8) (21.3) (22.9) (24.4) (25.9) (27.4) (32.0) (33.5) (36.6) (3.0) (16.5) (17.1) (18.3) (19.5) (20.7) (21.9) (23.8) (27.4) (29.0) (30.5) (3.7) (13.4) (14.0) (14.9) (17.4) (18.6) (19.8) (20.7) (24.4) (25.6) (27.4) 15 NR NR (4.6) (13.7) (14.9) (15.8) (17.1) (18.3) (21.3) (22.6) (24.4) 20 NR NR NR NR (6.1) (14.0) (15.2) (16.5) (19.2) (20.1) (21.3) 30 NOZZLE Approximate Distance of Heat Throw (Feet) Distance From UNIT SIZE BTU/Hr (kw) Floor to Bottom 100, , , , , , , , , ,000 of Unit H (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1) ft. (m) Approximate Distance of Heat Throw - Feet (Meters) (2.4) (19.8) (21.3) (22.9) (24.4) (25.9) (27.4) (29.0) (35.1) (36.6) (38.1) (3.0) (17.4) (18.3) (19.5) (20.7) (21.9) (23.8) (26.2) (30.2) (32.0) (33.5) (3.7) (15.2) (16.5) (17.4) (18.3) (19.5) (21.3) (23.5) (26.8) (28.7) (30.5) 15 NR (4.6) (13.7) (14.6) (15.2) (16.2) (18.0) (19.5) (22.6) (24.1) (25.6) 20 NR NR NR (6.1) (13.4) (14.3) (16.2) (17.7) (20.1) (21.6) (22.9) 60 NOZZLE Approximate Distance of Heat Throw (Feet) Distance From UNIT SIZE BTU/Hr (kw) Floor to Bottom 100, , , , , , , , , ,000 of Unit H (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1) ft. (m) Approximate Distance of Heat Throw - Feet (Meters) (2.4) (22.9) (24.4) (25.9) (27.4) (29.0) (30.5) (33.5) (38.1) (39.6) (42.1) (3.0) (19.8) (21.3) (22.9) (24.1) (25.3) (26.8) (29.0) (33.2) (35.1) (36.6) (3.7) (18.3) (19.5) (20.7) (21.9) (23.2) (24.4) (25.6) (30.5) (31.4) (32.9) (4.6) (15.2) (16.5) (17.1) (18.6) (19.8) (20.7) (21.6) (25.9) (26.8) (28.7) 20 NR (6.1) (14.9) (15.8) (16.8) (18.0) (18.6) (19.8) (23.5) (24.7) (25.9) 23

24 HEAT THROW DATA 90 NOZZLE Approximate Distance of Heat Throw (Feet) UNIT DISTANCE FROM FLOOR TO BOTTOM OF UNIT H SIZE 10 ft. 15 ft. 20 ft. 25 ft. 30 ft. (3.0 m) (4.6 m) (6.1 m) (7.6 m) (9.1 m) 100 NR 30 x 25 NR NR NR (9.1) (7.6) 125 NR 35 x 30 NR NR NR (10.7) (9.1) 150 NR 40 x 35 NR NR NR (12.2) (10.7) 175 NR 45 x 40 NR NR NR (13.7) (12.2) 200 NR 50 x x 35 NR NR (15.2) (12.2) (12.2) (10.7) 225 NR 55 x x 35 NR NR (16.8) (12.2) (14.6) (10.7) 250 NR 60 x x x 35 NR (18.3) (13.7) (17.1) (12.2) (15.2) (10.7) 300 NR 70 x x x x 35 (21.3) (13.7) (19.8) (12.2) (18.3) (10.7) (16.8) (10.7) 350 NR 80 x x x x 35 (24.4) (15.2) (21.3) (13.7) (19.8) (12.2) (18.3) (10.7) 400 NR 100 x x x x 40 (30.5) (15.2) (24.4) (13.7) (22.9) (12.2) (19.8) (12.2) NOTES: 1. All throw data figures are approximations. Allowances should be made for optimum performance, altitude, etc. 2. N.R. - Units not recommended at these mounting heights. 3. Nozzles are not supplied for unit heaters below size Nozzles are available for QVEF/QVEB units , 60 and 90 nozzles are shipped unassembled. "Y" SPLITTER Approximate Distance of Heat Throw (Feet) Distance From UNIT SIZE BTU/Hr (kw) Floor to Bottom 100, , , , , , , , , ,000 of Unit H (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1) ft. (m) Approximate Distance of Heat Throw - Feet (Meters) (2.4) (14.3) (15.5) (18.3) (19.8) (21.3) (21.9) (24.4) (29.0) (30.5) (31.4) (3.0) (12.5) (13.4) (15.8) (17.1) (18.6) (19.2) (21.0) (25.0) (26.5) (28.0) (3.7) (11.3) (12.2) (14.3) (15.5) (16.8) (17.4) (19.2) (22.9) (24.1) (25.0) 24

25 NOZZLE DIMENSIONS A c B 30 NOZZLE* 60 NOZZLE* 23-1/2 B 90 NOZZLE* Y-SPLITTER* *30, 60 and 90 Nozzles are field assembled; Y-splitter is factory assembled. NOZZLE DIMENSIONAL DATA CHART SYMBOL NOZZLE TYPE DEG. 17-1/2 20-1/4 20-1/ /4 28-1/2 31-1/4 36-3/4 42-1/4 47-3/4 (444) (514) (514) (584) (654) (724) (794) (933) (1073) (1213) WIDTH 60 DEG. 17-1/2 20-1/4 20-1/ /4 28-1/2 31-1/4 36-3/4 42-1/4 47-3/4 A (444) (514) (514) (584) (654) (724) (794) (933) (1073) (1213) in. 90 DEG. 17-1/2 20-1/4 20-1/ /4 28-1/2 31-1/4 36-3/4 42-1/4 47-3/4 (mm) (444) (514) (514) (584) (654) (724) (794) (933) (1073) (1213) Y-Splitter 15-3/8 18-1/8 18-1/8 20-7/8 23-5/8 26-3/8 29-1/8 34-5/8 40-1/8 45-5/8 (391) (460) (460) (530) (600) (670) (740) (879) (1019) (1159) 30 DEG. 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 (495) (495) (495) (495) (495) (495) (495) (495) (495) (495) HEIGHT 60 DEG. 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 B (495) (495) (495) (495) (495) (495) (495) (495) (495) (495) in. 90 DEG. 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 19-1/2 (mm) (495) (495) (495) (495) (495) (495) (495) (495) (495) (495) Y-Splitter 21-1/8 21-1/8 21-1/8 21-1/8 21-1/8 21-1/8 21-1/8 21-1/8 21-1/8 21-1/8 (537) (537) (537) (537) (537) (537) (537) (537) (537) (537) 30 DEG. 11-1/2 11-1/2 11-1/2 11-1/2 11-1/2 11-1/2 11-1/2 11-1/2 11-1/2 11-1/2 FURTHEST (292) (292) (292) (292) (292) (292) (292) (292) (292) (292) DEPTH 60 DEG. 19-3/8 19-3/8 19-3/8 19-3/8 19-3/8 19-3/8 19-3/8 19-3/8 19-3/8 19-3/8 C (492) (492) (492) (492) (492) (492) (492) (492) (492) (492) in. 90 DEG. 22-3/8 22-3/8 22-3/8 22-3/8 22-3/8 22-3/8 22-3/8 22-3/8 22-3/8 22-3/8 (mm) (568) (568) (568) (568) (568) (568) (568) (568) (568) (568) Y-Splitter /8 13-1/8 15-1/8 20-5/8 20-5/8 (279) (279) (279) (279) (279) (333) (333) (384) (524) (524) 25

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