Technical Guide for: Indoor Mounted Units To 64,000 CFM And...

SDFI Direct FiredGas Heating SystemSDFI Direct FiredGas Heating System

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Warm

Sterling

Keeps You

TGSDFI-2

Technical Guide for:

Indoor Mounted UnitsTo 64,000 CFMAnd 9M BTUH

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HVAC PRODUCTS

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2

HVAC PRODUCTS

Sterling

Keeps You

Warm

Sterling

Keeps You

Warm

In the business of commercial and industrial operations, efficient and low-cost heating isessential. Sterling keeps you warm for less.

Since 1946, Sterling has been providing cost-effective, reliable HVAC heating solutions. Ourproven Direct Fired Gas Heating System adds warm, fresh and clean air to your workenvironment for greater comfort and productivity.

This Technical Guide will help you choose an Sterling Direct Fired Gas Heating System toprovide efficient, cost-effective heating for your warehouse, factory or process operation. TheGuide 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 dimensionalinformation and cabinet arrangement diagrams.

If you have questions, please contact Sterling’s Customer Service Department at214-638-6010. We’ll be glad to help.

SDFI Direct FiredGas Heating SystemTechnical Guide

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3

HVAC PRODUCTS

Table of Contents

Air Delivery Tables .................................................... 4-5

Burner Performance Table ....................................... 6-7

Dimensions

Horizontal Units ............................................. 8-9

Vertical Units .............................................. 10-11

Return Air Sections .......................................... 12

Filter Banks ...................................................... 13

Inlet Dampers .................................................. 14

Discharge Louvers ........................................... 15

Control Systems .................................................... 16-19

Typical Wiring Diagram ........................................ 20-21

Amp Draw Table ........................................................ 22

Sequence of Operation.............................................. 22

Typical Gas Piping Layout ......................................... 23

Cabinet Arrangements .............................................. 24

Unit Weights .............................................................. 24

Guide Specification – Basic Unit ................................. 25

Guide Specification – Mixing DampersWith Return Air Flow System ......................................... 26

Guide Specification – BACview Controller ................... 27

4

1/4”HP11

11/2

23

11/2

22332333355555555

71/2

571/2

71/2

71/2

—71/2

71/2

71/2

10151010151520

3/8”HP11

11/2

2322233233555555555

71/2

71/2

571/2

71/2

1010

71/2

71/2

71/2

10151015151520

1/2”HP1

11/2

11/2

2322333333555555555

71/2

71/2

71/2

71/2

71/2

1010

71/2

71/2

71/2

10151015151520

3/4”HP1

11/2

11/2

232233333355555

71/2

571/2

71/2

71/2

71/2

71/2

71/2

101010

71/2

101010151515152020

1”HP—11/2

233233333355555

71/2

71/2

71/2

71/2

71/2

71/2

71/2

71/2

71/2

10101510101015151515202020

2”HP——33533555

—55

71/2

71/2

71/2

71/2

71/2

10——101010—15151515———1520—20252530

11/2”HP—22333335555555

71/2

71/2

71/2

71/2

71/2

71/2

71/2

10101010101515—151515151520202025

11/4”HP—11/2

23333335355555

71/2

71/2

71/2

71/2

71/2

71/2

71/2

1071/2

10101515—101515151515202025

Air Delivery Table

Blower HP Selection

160019002200260030003250350037504000425045005000550060006500700075008000850090009500

10,00010,50011,00011,00012,00013,00014,00015,00014,00015,00016,00018,00020,00022,00024,00026,00028,00030,000

Total External Static Pressure (W.C.)FPMOutlet

Velocity

CFMStd. Air@ 70°

UnitModel

NOTE:The horsepower selections are based on system externalstatic pressure. One or more of the following must be addedwhen applicable.

A. Motor Operated Inlet Damper .13’’ W.C.

B. V-Bank Filter Section .25’’ W.C.

C. Discharge Louver .13’’ W.C.

191422732632311035892257243126042778295122392488273629852265243926132787296221432262238125002619215723532549274529412086223523852683298124862581279630113226

SELECTION GUIDE1. Determine the required amount of replacement air

(CFM) by computing the total amount of air beingexhausted. (Restaurants should be sized for 90% ofexhaust air to minimize food odors.)

2. Determine the total external static pressure by addingthe pressure drops through all accessories and ducts.

3. Select unit sizes and motor horsepowerfrom table.

109

112

115

118

120

122

125

130

5

2”HP————101015———151520——2020202025252525252530303030——30304040404050——50505060

11/2”HP——71/2

71/2

101010——1515151515151520202020202520202525252530—2525303030404040—4040405050

11/4”HP—71/2

71/2

71/2

71/2

1010—101015151515151515152020202020202025252525202525253030304040303040405050

1”HP5

71/2

71/2

71/2

71/2

71/2

1071/2

101010151515151515151520202020202020252525202020252530304040253040404050

3/4”HP55

71/2

71/2

71/2

71/2

71/2

71/2

71/2

1010101510101515151515202015202020202025152020202525303040252530404050

1/2”HP555

71/2

71/2

71/2

71/2

71/2

71/2

71/2

10101010101015151515152015151520202020151520202025253030202530304040

3/8”HP5555

71/2

71/2

71/2

71/2

71/2

71/2

10101010101015151515152015151520202020151520202025253030202525304040

22392363248826122736286129852178226524392613278729622143226223812500261927382857297630952451254926472745284329413039223523852534268328322981313032793428236625812796301132263441

1/4”HP55555

71/2

71/2

71/2

71/2

71/2

71/2

1010

71/2

101010151515151515151515202020151515202020252530202025304040

90009500

10,00010,50011,00011,50012,00012,50013,00014,00015,00016,00017,00018,00019,00020,00021,00022,00023,00024,00025,00026,00025,00026,00027,00028,00029,00030,00031,00030,00032,00034,00036,00038,00040,00042,00044,00046,00044,00048,00052,00056,00060,00064,000

Air Delivery Table

Blower HP SelectionFPM

OutletVelocity

CFMStd. Air@ 70°

UnitModel

Total External Static Pressure (W.C.)

215

218

220

222

225

230

6

100°RISE

191 227 263 311 358 388 418 448 478 508 537 597 657 717 776 836 896 9551015107511351194125413141314143315531672179116721791191120302150238826272866310533443583

160019002200260030003250350037504000425045005000550060006500700075008000850090009500

10,00010,50011,00011,00012,00013,00014,00015,00014,00015,00016,00017,00018,00020,00022,00024,00026,00028,00030,000

110°RISE

206 245 284 335 387 419 451 483 516 548 580 644 709 773 838 902 96710311096116012241289135314181418154716761804193318041933206221912320257828363093335136093867

Single Blower Models

Burner Performance Table

UnitModel

CFMStd. Air@ 70°

120°RISE

221 262 304 359 414 449 483 518 552 587 621 690 759 828 897 96610351104

11733124213111380144915181518165617941932207019322070220823462484276030363312358838644140

90°RISE

175 208 241 285 329 356 384 411 438 466 493 548 603 658 712 767 822 877 932 98610411096115112051205131514251534164415341644175318631973219224112630284930693288

80°RISE

159 189 219 258 298 323 348 373 397 422 447 497 546 596 646 696 745 795 845 894 944 994104310931093119212921391149013911490159016891788198721862385258327822981

70°RISE

142 169 195 231 266 288 311 333 355 377 399 444 488 532 577 621 665 710 754 798 843 887 932 976 976106511531242133112421331141915081597177419522129230724842661

109

112

115

118

120

122

125

130

130°RISE

235 279 323 382 440 477 514 550 587 624 661 734 807 881 9541027110111741248132113941468154116151615176119082055220220552202234924952642293632293523381641104404

SELECTION GUIDE1. Determine the temperature rise required

through the heater by subtracting the winterdesign temperature from the desired indoortemperature.

3. Values shown in above MBH Input Tablesare based on -40° F Inlet Temperature.MBH input shown on unit rating plate willbe corrected for actual air density.

4. Natural gas units are limited to 130° Ftemperature rise, propane units are limitedto 100° F temperature rise.

2. Select burner required.BTUH = SCFM x 1.32605 x 29.92 x 0.24 x 60 x Temperature Rise .92 (460 + Temperature Rise + Inlet Temperature)

where 1.32605 = density of air handled by the blower29.92 = barometric pressure at sea level0.24 = specific heat of the air handled by the blower60 = conversion for minutes to hour0.92 = average ratio of net and gross heating values of common fuel

gases (92% sensible, 8% latent)

7

100°RISE

1075113511941254131413731433155316721791191120302105226923882508262727472866298631052986310532243344346335833702358338224060429945384777501652555494525557326210668871657643

80°RISE

894 944 9941043109311431192129213911490159016891788188819872087218622852385248425832484258326832782288129813080298131803378357737763974417343724571437247695167556459626359

Twin Blower Models

Burner Performance Table

120°RISE

1242131113801449151815871656179419322070220823462484262227602898303631743312345035883450358837263864400241404278414044164692496852445520579660726348607266247176772882808832

90°RISE

986104110961151120512601315142515341644175318631973208221922301241125212630274028492740284929593069317832883397328835073726394541644384460348225041482252605699613765757014

110°RISE

1160122412891353141814821547167618041933206221912320244925782707283629643093322233513222335134803609373838673996386741244382464048985156541356715929567161876702721877338249

215

218

220

222

225

230

CFMStd. Air@ 70°

UnitModel

70°RISE

798 843 887 932 97610201065115312421331141915081597168617741863195220402129221823072218230723952484257326612750266128393016319433713549372639034081390342584613496853235678

90009500

10,00010,50011,00011,50012,00013,00014,00015,00016,00017,00018,00019,00020,00021,00022,00023,00024,00025,00026,00025,00026,00027,00028,00029,00030,00031,00030,00032,00034,00036,00038,00040,00042,00044,00046,00044,00048,00052,00056,00060,00064,000

130°RISE

1321139414681541161516881761190820552202234924952642278929363082322933763523367038163670381639634110425744044550440446974991528455785871616564586752645870467633822088079394

8

A/R

A/S

A/S

O/A

A/R

S/A

S/A

109112115118120122125130

Single Blower Models – Horizontal Units

Dimensions

DimensionsModel

A2929

371/4

371/4

54546666

J81/4

81/4

141/4

141/4

141/4

141/4

201/4

201/4

P341/2

341/2

401/2

401/2

491/2

491/2

611/2

611/2

L233/4

233/4

393/4

393/4

483/4

483/4

483/4

483/4

M3434404049496161

F161/2

145/8

161/8

141/2

179/16

165/16

205/16

179/16

E101/2

133/8

1619

247/8

273/8

313/8

367/8

C3333434352526060

NOTE: All dimensions in inches subject to manufacturing tolerances.

C000498A

UNIT COMPONENTS 1. Inlet Damper 2. R/A section (before burner) 3. V-bank 4. Burner section

5. R/A section (after burner) 6. Blower section 7. Filter access 8. Adjustable profile

9. Control cabinet10. Access door (piping compartment)11. Gas piping manifold12. R/A access

13. Return air damper14. Belt guard15. Return air flow station

(required for ETL listedReturn Air Unit)

N251/8

251/8

401/4

401/4

491/8

491/8

491/8

491/8

K2828434352525252

H3030303048486060

B4545515160607272

D12

153/4

183/4

22247/8

273/8

313/8

367/8

9

A/R

A/S

A/S

O/A

A/R

S/A

S/A

S/A

9. Control cabinet10. Access door (piping compartment)11. Gas piping manifold12. R/A access

UNIT COMPONENTS 1. Inlet Damper 2. R/A section (before burner) 3. V-bank 4. Burner section

215218220222225230

Twin Blower Models – Horizontal Units

Dimensions

DimensionsModel

A371/4

371/4

54546666

H79799696

120120

M8282

109109133133

J1010

141/4

141/4

201/4

201/4

L393/4

393/4

483/4

483/4

483/4

483/4

F161/8

131/4

201/4

173/4

213/4

185/8

C434352526060

B9393

120120144144

P821/2

821/2

1091/2

1091/2

1333/8

1333/8


C000497A

13. Return air damper14. Belt guard15. Return air flow station

(required for ETL listedReturn Air Unit)

5. R/A section (after burner) 6. Blower section 7. Filter access 8. Adjustable profile

N401/4

401/4

491/8

491/8

491/8

491/8

K434352525252

G221/2

221/2

295/8

295/8

375/8

33

D183/4

22247/8

273/8

313/8

367/8

E1619

247/8

273/8

313/8

367/8

10

K2828434352525252

109112115118120122125130

P341/2

341/2

401/2

401/2

491/2

491/2

611/2

611/2

Single Blower Models – Vertical Units

Dimensions

DimensionsModel

A2929

371/4

371/4

54546666

F161/2

145/8

161/8

141/2

179/16

165/16

205/16

179/16

L233/4

233/4

393/4

393/4

483/4

483/4

483/4

483/4

M3434404049496161

H3030303048486060

D12

153/4

183/4

22247/8

273/8

313/8

367/8

C3333434352526060

B4545515160607272


C000500A

N251/8

251/8

401/4

401/4

491/8

491/8

491/8

491/8

E101/2

133/8

1619

247/8

273/8

313/8

367/8

J81/4

81/4

141/4

141/4

141/4

141/4

201/4

201/4

UNIT COMPONENTS 1. Inlet Damper 2. R/A section (before burner) 3. V-bank 4. Burner section 5. R/A section (after burner)

6. Blower section 7. Filter access 8. Adjustable profile 9. Control cabinet10. Access door

11. Gas piping manifold12. R/A access13. Return air damper14. Belt guard

15. Return air flow station(Required for ETL listedReturn Air Unit)

16. Screen

S171/4

171/4

171/4

2020202121

R3232323244444444

Q3636363648484848

S/A

A/S

R/A

R/A

S/A

O/A

11

6. Blower section 7. Filter access 8. Adjustable profile 9. Control cabinet10. Access door

215218220222225230

Twin Blower Models – Vertical Units

Dimensions

DimensionsModel

A371/4

371/4

54546666

E1619

247/8

273/8

313/8

367/8

N401/4

401/4

491/8

491/8

491/8

491/8

F161/8

131/4

201/4

173/4

213/4

185/8

J1010

141/4

141/4

201/4

201/4

D183/4

22247/8

273/8

313/8

367/8

C434352526060

B9393120120144144

P821/2

821/2

1091/2

1091/2

1333/8

1333/8


C000499A

G221/2

221/2

295/8

295/8

375/8

33

H79799696

120120

K434352525252

L393/4

393/4

483/4

483/4

483/4

483/4

M8282

109109133133

UNIT COMPONENTS 1. Inlet damper 2. R/A section (before burner) 3. V-bank 4. Burner section 5. R/A section (after burner)

11. Gas piping manifold12. R/A access13. R/A air damper14. Belt guard

15. Return air flow station(Required for ETL listedReturn Air Unit)

16. Screen

S181/2

2222

231/2

323/4

323/4

Q363648484848

R323244444444

S/A

A/S

R/A

R/A

S/A

S/A

O/A

12

215-218393/4 x 82

10 x 79

ABCDE

Model

R/A Opening Size

Return Air Section

Dimensions

MODELDimension

220-22254

12052

491/8

1091/2

225-2306614452

491/8

1333/8

215-218371/4

9343

401/4

821/2

125-130667252

491/8

611/2

109-112294528

251/8

341/2

120-122546052

491/8

491/2

115-118371/4

5143

401/4

401/2

220-222483/4 x 109141/4 x 96

225-230483/4 x 133201/4 x 120

125-130483/4 x 61201/4 x 60

120-122483/4 x 49141/4 x 48

115-118393/4 x 40141/4 x 30

109-112243/4 x 3481/4 x 30

C000503

NOTE: R/A openings shall be centered on floor.NOTE: All dimensions in inches subject to manufacturing tolerances.

Before BurnerAfter Burner

13

Filter Dimensions

AB

ModelV-Bank Filter Qty.

& Size

V-Bank Filter and Filter Information

MODELDimension

220-22254

120

225-23066

144

215-218371/4

93

125-1306672

109-1122945

120-1225460

115-118371/4

51

215-218(18)

15 x 20 x 2

220-222(35)

16 x 20 x 2

225-230(42)

20 x 20 x 2

125-130(24)

16 x 20 x 2

120-122(10)

20 x 25 x 2

115-118(9)

16 x 20 x 2

109-112(4)

20 x 20 x 2

C000502


14

AB

Inlet Damper

Dimensions

ModelDimension

109-1122945

215-218371/4

93

220-22254

120

225-23066

144

125-1306672

120-1225460

115-118371/4

51NOTE: All dimensions in inches subject to manufacturing tolerances.

C000501A

INLET DAMPER

15

DISCHARGE LOUVER

SIDE INLET

Dimensions

ABC

Discharge Louvers


C000501A

ModelDimension

109-11221

2013/16

26

215-218257/32

703/4

233/8

220-222251/16

883/4

421/4

225-230251/16

1111/8

421/4

125-13045

417/8

403/4

120-12245

321/2

311/4

115-11824

2515/16

23

16

MDT Control System

Application:

Modulating DischargeTemperature Control

Control Systems

COMPONENT I.D.1. Unit DDC Controller2. Signal Conditioner

NET +

NET -

SHIELD

SENSE+12VRNCT+RNCT-GND

GNDRNET+RNET-+12V

TE

NR

0

98

765

4

3 2 1

LOCAL ACCESS

GND

INPUTS 1&205V,THERM OR DRY

INPUTS 3 & 4THERM OR DRY

GND

IN-5

IN-6

LED

INPUTS 5 & 6THERM DRY or LStat

CLASS 224 Vac. 50/60 CYCLE2Ova, 0.83AUSE COPPERCONDUCTORS ONLY.

CAUTION:To Reduce The Risk of Fire or or Electrical Shock, Do NotInterconnect Outputs of Different Class 2 Circuits

I/O ZONE 583

BT485Rx

Tx

+-

Batt

CR2032

Communications Selection

sneT

senO

mm

oC

Gnd

Hot

Format

LStat Rnet

Short PinsL StatIN-5 24 V ac

Power

Run

Error

IN-7

+3V

Gnd

IN-8

Pot.Only

Thermistor/Dry Contact0-5 vdc

On4321

EIA-485

BACnetover ARC 156

Comm SelectorDIP Switch

BAUD Rates SW1 SW2 PROTOCOLS SW1 SW2950019.2 K38.4K76.8 K

OFFOffOnOn

OffOnOffOn

BACnetMS/TPN2Modbus

Off

OnOff

Off

OffOn

Gnd

A0-3

Gnd

A0-2

A0-1

Gnd

DO-2

DO-1BUSPower for D.O.s

0-10vdc5ma Max.

BACnet

FormatJumper

LStat / Rnet PortSelector Jumper

Gain 1Jumper

CommunicationSelection Jumper

DO-3

DO-4

DO-5

GND

IN-4

IN-2

IN-3

IN-1

GND +

-

+

-

+

-

}

AO:

GND

0

98

7653 2 1

4

54

12

3

6

Discharge TemperatureSET Here

Includes:

Discharge air sensor 5 mounted in unit discharge with remote mounted 4 x 4box cover 6 including manual potentiometer to enable unit and adjust temperaturesetpoint, Fan On Light, Burner On Light and Cool On Light. Additional potentiometeris provided if optional return air damper section for manual or mixed air control isordered.

C000635

3. Modulating Gas Valve4. Inlet Air Sensor

5. Discharge Air Sensor6. Remote Control Station

17

Control Systems

MRT Control System

Application:

Modulating RoomTemperature Control


NET +

NET -

SHIELD


GNDRNET+RNET-+12V

TE

NR

0

98

765

4

3 2 1

LOCAL ACCESS

GND



GND

IN-5

IN-6

LED




I/O ZONE 583

BT485Rx

Tx

+-

Batt

CR2032


sne

Tse

nO

mm

oC

Gnd

Hot

Format

LStat Rnet

Short Pins

L StatIN-5 24 V ac

Power

Run

Error

IN-7

+3V

Gnd

IN-8

Pot.Only


On4321

EIA-485

BACnetover ARC 156



OFFOffOnOn

OffOnOffOn

BACnetMS/TPN2Modbus

Off

OnOff

Off

OffOn

Gnd

A0-3

Gnd

A0-2

A0-1

Gnd

DO-2


0-10vdc5ma Max.

BACnet

FormatJumper


Gain 1Jumper


DO-3

DO-4

DO-5

GND

IN-4

IN-2

IN-3

IN-1

GND +

-

+

-

+

-

}

AO:

GND

0

98765

3 2 1

4

54

12

6

3

7

Space TemperatureSET Here

Space TemperatureSENSED Here

Includes:

Discharge air sensor 5 mounted in unit discharge with remote mounted 4 x 4box cover 7 including manual potentiometer to enable unit and adjust temperaturesetpoint, Fan On Light, Burner On Light and Cool On Light. Also includes RS-stdroom sensor 6 (does not allow remote room setpoint adjustment. Additionalpotentiometer is provided if optional return air damper section for manual or mixedair control is ordered.

C000634


5. Discharge Air Sensor6. Room Thermostat7. Remote Control Station

18

Control Systems

MRT Pro Control System

Application:

Modulating RoomTemperature Control withRS-Pro room sensor allowingafter hours unit enable, roomsetpoint ajustment, and digitaltemperature readout.


MANUAL ON

INFO

WARMER

COOLER

68 F

NET +

NET -

SHIELD


GNDRNET+RNET-+12V

TE

NR

0

98765

4

3 2 1

LOCAL ACCESS

GND



GND

IN-5

IN-6

LED




I/O ZONE 583

BT485Rx

Tx

+-

Batt

CR2032


sne

Tse

nO

mmo

C

Gnd

Hot

Format

LStat Rnet

Short Pins

L StatIN-5 24 V ac

Power

Run

Error

IN-7

+3V

Gnd

IN-8

Pot.Only


On4321

EIA-485

BACnetover ARC 156



OFFOffOnOn

OffOnOffOn

BACnetMS/TPN2Modbus

Off

OnOff

Off

OffOn

Gnd

A0-3

Gnd

A0-2

A0-1

Gnd

DO-2


0-10vdc5ma Max.

BACnet

FormatJumper


Gain 1Jumper


DO-3

DO-4

DO-5

GND

IN-4

IN-2

IN-3

IN-1

GND +

-

+

-

+

-

}

AO:

GND

0

98765

3 2 1

4

54

12

6

3

Space TemperatureSET And SENSED Here

C000633

Includes:

Discharge air sensor 5 mounted in unit discharge with remote mounted RS-Proroom sensor 6 with push buttons for room setpoint adjustment and digitaltemperature readout. On units with optional return air damper section a remotemounted 4 x 4 box cover is provided with potentiometer for manual or mixed aircontrol.


5. Discharge Air Sensor6. Room Thermostat

19

Control Systems

MRT Expert Control System

Application:

Modulating RoomTemperature Control withBACview controller allowingafter hours unit enable, roomsetpoint adjustment, operatingfeedback, monitoring of alarmstatus and digital temperaturereadout with RS-std roomsensor.

NET +

NET -

SHIELD


GNDRNET+RNET-+12V

TE

NR

0

98765

4

32 1

LOCAL ACCESS

GND



GND

IN-5

IN-6

LED




I/O ZONE 583

BT485Rx

Tx

+-

Batt

CR2032


sneT

senO

mm

oC

Gnd

Hot

Format

LStat Rnet

Short Pins

L StatIN-5 24 V ac

Power

Run

Error

IN-7

+3V

Gnd

IN-8

Pot.Only


On4321

EIA-485

BACnetover ARC 156



OFFOffOnOn

OffOnOffOn

BACnetMS/TPN2Modbus

Off

OnOff

Off

OffOn

Gnd

A0-3

Gnd

A0-2

A0-1

Gnd

DO-2


0-10vdc5ma Max.

BACnet

FormatJumper


Gain 1Jumper


DO-3

DO-4

DO-5

GND

IN-4

IN-2

IN-3

IN-1

GND +

-

+

-

+

-

}

AO:

GND

0

9876

53 2 1

4

54

12

6

3

7

Space TemperatureSET Here

Space TemperatureSENSED Here


C000632

Includes:

Discharge air sensor 5 mounted in unit discharge with remote mounted BACviewcontroller 7 to set space temperature, operating schedules, and optional dampercontrol setpoints. Service information, operating feedback and alarm status can alsobe monitored. Also includes a RS-std room sensor 6 .


5. Discharge Air Sensor6. Room Thermostat

20

Wiring Diagram

Typical Wiring Diagram - Page 1 C000630

-

+

-

+

21

Typical Wiring Diagram - Page 2

Wiring Diagram

C000630

NET +

NET -

SHIELD


GNDRNET+RNET-+12V

TE

NR

0

98

765

4

3 2 1

LOCAL ACCESS

GND



GND

IN-5

IN-6

LED




I/O ZONE 583

BT485Rx

Tx

+-

Batt

CR2032


sneT

senO

mmo

C

Gnd

Hot

Format

LStat Rnet

Short PinsL StatIN-5 24 V ac

Power

Run

Error

IN-7

+3V

Gnd

IN-8

Pot.Only


On4321

EIA-485

BACnetover ARC 156



OFFOffOnOn

OffOnOffOn

BACnetMS/TPN2Modbus

Off

OnOff

Off

OffOn

Gnd

A0-3

Gnd

A0-2

A0-1

Gnd

DO-2


0-10vdc5ma Max.

BACnet

FormatJumper


Gain 1Jumper


DO-3

DO-4

DO-5

GND

IN-4

IN-2

IN-3

IN-1

GND +

-

+

-

+

-

}

AO:

GND

0

98

7653 2 1

4

+

-

O

C

E

+

-

O

C

E+

-

O

C

E

22

AMPS for 208V 3 Ph.AMPS for 230V 3 Ph.AMPS for 460V 3 Ph.AMPS for 575V 3 Ph.


DIRECT FIRED UNITSWITH RETURN AIR

Electrical Data and Sequence of Operation

Sequence of Operation – Return Air Units

Signal from remote control I to AirTrakController D, sets operational parametersfor dampers B and C, and burner. Damperoperation can be manual, building pres-sure or mixed air temperature.

Return air dampers B, and outside airdampers C, are interlocked to movetogether. As one opens, the other closes.As the return air dampers open, allowingmore return air to enter the unit, the out-side air dampers move toward the closedposition, decreasing the amount of outsideair. Pressure sensor and flow station J,senses change in return airflow and signalsAirTrak Controller D.

Modulating gas valve H, regulates gassupply in response to signal from AirTrakController D. AirTrak Controller D, variessignal based on input from room tempera-ture sensor F, discharge temperaturesensor G, and airflow sensor J. Gas valve Hcan provide approximately 4% to 100% ofrated burner capacity.

P000621

14.64.22.11.7

ITEM

A

310.6 9.6 4.8 3.9

516.715.2 7.6 6.1

MOTOR HORSEPOWER

Amp Draw Table

BlowerMotor

1030.828.014.011.0

71/2

24.222.011.0 9.0

11/2

6.66.03.02.4

27.56.83.42.7

SOURCE

1546.242.021.017.0

ITEM

A

3088.080.040.032.0

40114.0104.0 52.0 41.0

MOTOR HORSEPOWER

BlowerMotor

60169.0154.0 77.0 62.0

50143.0130.0 65.0 52.0

2059.454.027.022.0

2574.868.034.027.0

SOURCE


Heating Only Unit2.42.21.10.9

ITEM

B

CONTROL CIRCUIT AMPS

ControlTransformer

SOURCE

AMPS

AMPS

AMPS

Steps to size optional disconnect switch:1. Find the blower motor HP required from tables on pages 4 and 5.

2. Find amp draw for required motor HP from chart in Item A above.

3. Find amps for control circuit from chart in Item B above.

4. Add amps from step 2 and step 3, multiply by 1.25.

NOTES:1. Above motor amps are based on 2002 edition of NEC.

2. Control circuit amps are based on standard controls.

23

Typical Gas Piping Layout

Schematic Component Diagrams

NOTES:1. Vent limiting devices provided wherever possible, when venting is required* the venting to outside is by

others on indoor units.

2. Units with 900 MBH and less use a pressure regulator (not shown) for high fire setting.

3. For inlet pressures under 10” W.C. - Please consult factory.

4. 3,300 MBH and above will require a minimum inlet pressure of 1 PSIG. For inlet pressures under1 PSIG - Please consult factory.

5. Units that are listed to the Z83.4 standard (100% make-up air) carry both ETL and CETL approvals.

6. Standard manifold meets FM requirements for inputs under 2,500 MBH for ETLlisted units.

7. Standard manifold meets IRI requirements for ETL listed units.

8. High gas pressure regulator required if inlet pressure exceeds 1/2 PSIG for inputs up to andincluding 900 MBH or inlet pressures over 5 PSIG for inputs greater than 900 MBH.

C000148

COMPONENT IDENTIFICATIONGP-01 HIGH GAS PRESSURE REGULATORGP-02 MAIN GAS SHUT-OFF VALVEGP-09 PILOT GAS PRESSURE REGULATORGP-11 MAIN TEST FIRING SHUT-OFF VALVEGP-13 PILOT GAS SHUT-OFF VALVEGP-27 ORIFICED NEEDLE VALVEVG-01 PILOT GAS VALVEVG-02 MAIN GAS VALVEVG-03 AUXILIARY GAS VALVEVG-04 NORMALLY OPEN VENT VALVEVG-07 MODULATING VALVEPS-04 LOW GAS PRESSURE SWITCHPS-07 HIGH GAS PRESSURE SWITCHPS-10 HIGH VELOCITY PRESSURE SWITCHPS-11 LOW VELOCITY PRESSURE SWITCH

24

Horizontal Discharge

Cabinet Arrangements and Weights

HLT HLBHLS

HRSHRT HRB

Vertical Discharge

Unit Weights (Approximate)

VRTVSTVLT

For all arrangements shown, controls are on near side.

APPROXIMATE WEIGHT (LBS.)

C000616

Blower SectionModel

InletHood

InletDamper

V-BankFilter Burner

ReturnAir

DischargeLouver

AirflowStation

70

80

110

125

150

215

230

C

67

94

159

224

158

268

388

A

67

94

159

224

158

268

388

165

185

275

310

275

410

500

260

375

550

700

510

725

1010

104

116

151

208

141

226

302

55

70

120

155

125

233

340

140

150

183

216

224

290

350

D

67

94

159

224

158

268

388

B

149

253

439

590

438

697

953

109-112

115-118

120-122

125-130

215-218

220-222

225-230

43

73

88

101

123

161

191

VerticalStand

134

149

259

356

242

387

517

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○

○

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○

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○

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○

○

○

○

○

25

HVAC PRODUCTS

Guide Specification – Base Unit

Base Bid Sterling model SDFI_____ make-up airunit(s) designed for indoor application. Theunit discharge shall be designed for easyadaptation to external duct work or optionalaccessories. The unit(s) shall be capable ofdelivering ___ cfm at ___ ESP using a ___horsepower (ODP) (TEFC) motor operatingon (208/3/60) (230/3/60) (460/3/60).

Burner SectionThe line burner shall be capable of delivering___BTUH firing on (natural gas) (propane)at an inlet pressure of ___ (inches watercolumn) (PSIG). The standard ETL listed unitwill meet ANSI, FM, and IRI requirements.Both burner and blower shall be compensatedfor an altitude of ___ feet above sea level.Manifold to be located outside of air stream.An observation port shall be located toprovide view of pilot and main flame.

Unit(s) shall be supplied with a wide rangeburner with a modulating turndown ratio of25:1. Adjustable profile plates shall be providedand sized to maintain the require velocity acrossthe line burner. The operation of the burner shallbe programmed through the flame safeguardwith timed prepurge and flame-sensed bymeans of a (flame rod)(ultra violet scanner).

The burner assembly and gas manifold shallbe completely prepiped and factory testedprior to shipment.

The unit shall be controlled by the AirTrakDDC control module with full BACnetcompatibility. Unit shall have the AirTrak(MDT - Modulating Discharge TemperatureControl System)(MRT – Modulating RoomTemperature Control System)(MRT-ProModulating Room Pro Temperature ControlSystem)( MRT-Expert Modulating RoomExpert Temperature Control System). TheAirTrak DDC control system shall include butnot be limited to the following controlsrequired for standard operation:• Electronic time clock with normal, holiday,

and override schedules. (Optional accessoryon MDT or MRT Control Systems).

• Timed freeze protection to prevent heater fromdischarging unheated air into the building.

• Inlet On-Off ductstat which will turn burneroff when inlet temperature equals desireddischarge air temperature as fuel savingsmode.

• On-Off night setback thermostat for loweroperating temperatures in unoccupiedmode as fuel savings mode. (Optionalaccessory on MDT or MRT Control Systems).

UNIT CASINGUnit casing and accessories shall be fabricatedfrom heavy-gauge bright spangled galvanizedsteel suitably reinforced to insure rigidity. Allcasings shall be air tight. Complete accessshall be provided to all components. Thisincludes the blower, burner, and electricalcomponents.

BLOWER SECTIONEach unit shall be supplied with centrifugalforward curve, DWDI fan(s) rated in accor-dance with AMCA standards. The fan or fansshall be mounted on a solid shaft for singleblowers and a hollow shaft for doubleblowers. Shaft designed for a maximumoperating speed not to exceed 75% of its firstcritical speed. Bearings are to be externalheavy-duty industrial prelubricated type.Blowers to be driven by a V-belt package sizedwith a capacity of 25% greater than themotor horsepower. Multiple belt applicationswill be matched sets. Drives are to be (fixed)(adjustable). Maximum outlet velocity _____FPM. Motor to be externally mounted onadjustable slide base. Belt guard shall beprovided for protection.

CONTROL ENCLOSUREThe units(s) shall be supplied with a controlcompartment and all controls mounted withinthis compartment are to be wiredto a numbered terminal strip. All wiringis to be color coded and in accordancewith the NEC. A circuit diagram of theapproved electrical drawing is to be laminatedto the inside of the control cabinet door. Allelectrical componentsshall bear a recognized label.

STANDARD CONTROLS 1. Main fan starters and overloads 2. Control circuit fuses 3. High temperature limit switch 4. Flame safeguard with alarm contacts 5. Flame rod sensor 6. Ignition transformer 7. Automatic pilot valve 8. Main gas automatic safety shutoff valve 9. MDT Control System10. Air proving differential switch11. Control transformer12. Remote control panel

OPTIONAL ACCESSORIES 1. Motorized inlet damper 2. V-bank filter box with filters 3. Insulation 4. Vibration hangers or mounting feet 5. Clogged filter switch 6. Disconnect switch 7. High gas pressure regulator (required

for inlet pressures over 1/2 PSIG) 8. UV flame detection

(mini or purple peeper) 9. Painted galvanized casing10. U. L. labeled control panel11. Vertical arrangement with

support stand and inlet birdscreen12. Mixed air section with or

without return air flow station13. Firestat14. 115 Volt service receptacle15. BACviewController

○

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26

HVAC PRODUCTS

Unit(s) shall have outside air and return airdampers with modulating actuator controlledby AirTrak DDC control system. The AirTrakDDC control system shall have capability todigitally control the outside air quantity froma nominal minimum of 20% to 100% withintegrated gas valve control at all roomconcentrations of CO2.

The return air inlet shall include a self-calibrating flow measuring station with agrid of velocity pressure probes with spacingno greater than 12” over the entire face ofthe return air opening and sampled everytwo seconds. Samples will be added to atwenty-five point rolling average and thenon to a second rolling average to providesmooth, accurate data that is delivered tothe AirTrak DDC control system everytwo seconds. The DDC control system shallbe capable of electronically displaying thereturn air/outside air ratio within 5%accuracy at all damper positions.

The AirTrak DDC control system shall becapable of controlling mixing dampers in:(Choose One)

Manual Mode: The “Manual” mode allowsmanual positioning of the outside air (O.A.)damper and return air (R.A.) damper bychanging the damper position setpoint.

Mixed Air Temperature Mode: The “MixedAir Temperature” mode shall provideautomatic control of the mixed air tempera-ture by modulating the outside air (O.A.)damper and return air (R.A.) damper tomaintain the mixed air temperature setpoint.As the mixed air temperature increasesabove the setpoint more outside air will beintroduced.

Building Pressure Mode: The “BuildingPressure” mode shall provide automaticbuilding pressure control by modulating theoutside air (O.A.) damper and return air(R.A.) damper to maintain the indoorbuilding pressure setpoint. As the buildingpressure decreases below the setpoint moreoutside air will be introduced.

Guide Specification – Mixing Dampers WithReturn Air Flow Station

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27

HVAC PRODUCTS

Guide Specification – BACview Controller

The display functions of the remote key-board display for the AirTrak DDC controlsystem shall have a minimum of two lines,sixteen character display which shall includebut not 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 sincelast reset

• Cooling interlock cycle count since lastreset

• Critical alarm conditions:o Airflow switch failureo Unit on, fan offo Unit off, fan ono Low discharge temperatureo Safety circuit openo Burner jumped

The control settings available on the remotekeyboard display for the AirTrak DDC controlsystem shall include but not be limited to thefollowing:

• Heating setpoint

• Cooling setpoint

• Economizer options

• Setback setpoint

• Freeze protection setpoint

• Maximum discharge air temperaturesetpoint

• Minimum discharge air temperaturesetpoint

• Minimum ventilation option and setpoint

• Time of day schedule selection andsetpoints (Not available on MDT or MRTControl Systems)o Normal 5/7 scheduleo Holiday scheduleo Manual override

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EfficientDirect FiredGas HeatingSystem

Choose Sterling Direct Fired Gas Heating• Heat large or small spaces efficiently with 100% combustion efficiency

• Constantly replace contaminated indoor air with fresh, heated outside air

• Low operating and maintenance costs

• Fresh air ventilation anytime — just turn off the gas heating system

• Simple, inexpensive installation

• Sterling, a leader in research, engineering, and customer service since 1946

• Fans tested to AMCA standards to insure rated airflow

Sterling

www.sterlinghvac.com

4830 Transport Drive Dallas TX 75247

Telephone 214.638.6010

Fax 214.905.0806

Printed in U.S.A.© Copyright U.S.A. 2005

HVAC PRODUCTS

Technical Guide for: Indoor Mounted Units To 64,000 CFM And...

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Transcript of Technical Guide for: Indoor Mounted Units To 64,000 CFM And...