Attachment_2_142010-26-0151.pdf

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Catalog No. 533-080 Printed in U.S.A. Form 39-7SI Rev. A Pg 1 12-2020 Replaces: New

Installation, Start-Up and Service Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 1,2

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 Unit Identification PREINSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12 Rigging Suspended Units Service Clearance Condensate Drain External Vibration Isolators INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-35 Base Rail Split Mixing Box Condensate Drain Variable Frequency Drive (VFD) Install Fan Motor Install Sheaves on Motor and Fan Shafts Install V-Belts Water and Steam Coil Piping Recommendations Coil Freeze-Up Protection Refrigerant Piping, Direct Expansion (DX) Coils Electric Heaters Discharge Modification START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35,36 Check List SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36-46 General Fan Motor Replacement Coil Cleaning Winter Shutdown (Chilled Water Coil Only) Field-Installed Coils Coil Removal Changing Coil Hand Filters Fan Shaft Bearing Removal Fan and Shaft Removal Lubrication Fan Sled Disassembly

METRIC CONVERSION CHART

SAFETY CONSIDERATIONS

Air-handling equipment is designed to provide safe and reli-able service when operated within design specifications. To avoid injury to personnel and damage to equipment or property when operating this equipment, use good judgment and follow safe practices as outlined below.

DANGER

NEVER enter an enclosed fan cabinet or reach into a unit while the fan is running.

LOCK OPEN AND TAG the fan motor power disconnect switch before working on a fan. Take fuses with you and note removal on tag. Electric shock can cause personal injury or death.

LOCK OPEN AND TAG the electric heat coil power dis-connect switch before working on or near heaters.

WARNING

CHECK the assembly and component weights to be sure that the rigging equipment can handle them safely. Note also, the centers of gravity and any specific rigging instructions.

CHECK for adequate ventilation so that fumes will not migrate through ductwork to occupied spaces when weld-ing or cutting inside air-handling unit cabinet or plenum.

WHEN STEAM CLEANING COILS be sure that the area is clear of personnel.

DO NOT attempt to handle access covers and removable panels on outdoor units when winds are strong or gusting until you have sufficient help to control them. Make sure panels are properly secured while repairs are being made to a unit.

DO NOT remove access panel fasteners until fan is com-pletely stopped. Pressure developed by a moving fan can cause excessive force against the panel which can injure personnel.

DO NOT work on dampers until their operators are disconnected.

BE SURE that fans are properly grounded before working on them.

39LA,LB,LC,LD,LF,LG,LH03-25

Indoor Air-Handling Units

INTRODUCTION

Unit Identification — The 39L units are identified by the 18-digit part number listed on the serial plate. The part number de-scribes all component, coil, motor, drive, and control selections.

See Fig. 1-9 for unit identification.

WARNING

DO NOT USE TORCH to remove any component. System contains oil and refrigerant under pressure.

To remove a component, wear protective gloves and gog-gles and proceed as follows:

a. Shut off electrical power to unit.

b. Recover refrigerant to relieve all pressure from sys-tem using both high-pressure and low pressure ports.

c. Traces of vapor should be displaced with nitrogen and the work area should be well ventilated. Refrig-erant in contact with an open flame produces toxic gases.

d. Cut component connection tubing with tubing cutter and remove component from unit. Use a pan to catch any oil that may come out of the lines and as a gage for how much oil to add to the system.

e. Carefully unsweat remaining tubing stubs when nec-essary. Oil can ignite when exposed to torch flame.

Failure to follow these procedures may result in personal injury or death.

CAUTION

DO NOT re-use compressor oil or any oil that has been exposed to the atmosphere. Dispose of oil per local codes and regulations. DO NOT leave refrigerant system open to air any longer than the actual time required to service the equipment. Seal circuits being serviced and charge with dry nitrogen to prevent oil contamination when timely repairs cannot be completed. Failure to follow these proce-dures may result in damage to equipment.

CAUTION

SECURE drive sheaves with a rope or strap before work-ing on a fan to ensure that rotor cannot free-wheel.

DO NOT restore power to unit until all temporary walk-ways inside components have been removed.

NEVER pressurize equipment in excess of specified test pressures.

PROTECT adjacent flammable material when welding or flame cutting. Use sheet metal or asbestos cloth to contain sparks. Have a fire extinguisher at hand and ready for immediate use.

IMPORTANT: The installation of air-handling units and all associated components, parts, and accessories which make up the installation and subsequent maintenance shall be in accordance with the regulations of ALL authorities having jurisdiction and MUST conform to all applicable codes. It is the responsibility of the installing contractor to determine and comply with ALL applicable codes and regulations.

Field-supplied motors should be Underwriters Laboratories (UL) or Canadian Standards Association (CSA) approved.

Field wiring must comply with National Electrical Code (NEC) and all local requirements.

39LA 39LB 39LC

39LD 39LF

39LG

39LH

HORIZONTAL DRAW-THRU

VERTICAL DRAW-THRU

Fig. 1 — Unit Identification a39-4440

39L C 03 HB CA 1

39L – 39L Air Handler

Special Order

Draw-Thru Options

Base Unit Coil Description

N/A

Unit Size

Model A

B

C D

F G H

A

Preheat Coil

C

Base Unit Coil Coil Type and Arrangement

AHK

Fan Discharge – Motor Frequency Fan Speed Motor HP – Type – Voltage

Insulation/Suspension Package/Hand Side

A a39-4441

Fig. 2 — 39L Model Number Nomenclature a39-4441

28N

28N – Coil Model Number

Coil Type A – Chilled Water

Coil Orientation S – Slant V – Vertical

F – Full

A S 4

Rows

Tubes in Face

Q

Circuiting Q – Quarter H – Half

D – Double

Fin Material Fins Per Inch Casing Material

A – AL 8 GALV.

B

C – AL 14 GALV.

G – CU 8 ST. STL.

H

J – CU 14 ST. STL.

– AL 11 GALV.

– CU 11 ST. STL.

A B

Tube Size (Copper) A – 0 .016 Std. H-Pin B – 0 .025 Std. H-Pin

Nominal Length Between Tube Sheets (cm)

X

– Non-ferrousX

R

Hand

– Right Hand

– Left Hand

R L

Fig. 3 — Chilled Water Coil Model Number Nomenclature a39-4442

28N

28N – Coil Model Number

Coil Type B – Hot Water

Coil Orientation V – Vertical

F – Full

B V 1

Rows

Tubes in Face

H

Circuiting

H – Half Fin Material Fins Per Inch Casing Material

A – AL 8 GALV.

B

C – AL 14 GALV.

G – CU 8 ST. STL.

H

J – CU 14 ST. STL.

– AL 11 GALV.

– CU 11 ST. STL.

A A

Tube Size (Copper) A – 0 .016 Std. H-Pin B – 0 .025 Std. H-Pin

Nominal Length Between Tube Sheets (cm)

X

– Non-ferrousX

L

Hand

– Right Hand

– Left Hand

R L

Fig. 4 — Hot Water Coil Model Number Nomenclature a39-4443

28N

28N – Coil Model Number

Coil Type E – Direct Expansion

Coil Orientation

V – Vertical

B – Face Split Half Circuit

E V 4

Rows

Tubes in Face

H

Circuiting A – Face Split Quarter Circuit Fin Material

Fins Per Inch Casing Material

A – AL 8 GALV.

B

C – AL 14 GALV.

G – CU 8 ST. STL.

H

J – CU 14 ST. STL.

– AL 11 GALV.

– CU 11 ST. STL.

A A

Tube Size (Copper) A – 0 .016 Std. H-Pin B – 0 .025 Std. H-Pin

Nominal Length Between Tube Sheets (cm)

Z

– Standard (varies with coil)Z

L

Hand

– Right Hand

– Left Hand

R L

S – Slant

C – Face Split Full Circuit D – Double Circuit E – Row Split Quarter Circuit

F – Row Split Half Circuit

G – Row Split Full Circuit

Fig. 5 — Direct Expansion Coil Model Number Nomenclature a39-4444

28L

28L – Coil Model Number

Coil Type Z – Steam Distributing Tube (1 in. OD)

Coil Position

Z 2 4

Rows

Tubes in Face

F

Circuiting

F – Non-Freeze Full Circuit

D 3

Tube Size (Copper) 3 – 1 in. OD x 0.030 Wall

Nominal Length Between Tube Sheets (cm)

[ Blank]

Fin Material Fins Per Inch Casing Material

C – AL 6 GALV.

D E

– AL 9 GALV.

– AL 12 GALV.

[ Blank]

9- 445

Fig. 6 — Steam Distributing Tube Model Number Nomenclature a39-4445

39L

28L – Drive Package Model Number

Drive Type V – Variable Speed

Fan Type

K 2 12

Unit Size Large Face Area (sq. ft.)

10 B A 1250

Position 12 is 0 if rpm is 3 digits

Motor Horsepower

– Constant SpeedK

– Forward Curve without VFD 2 – Forward Curve with VFD

– ½ hp

– ¾ hp

– 1 hp

– 1 ½ hp

– 2 hp

– 3 hp

– 5 hp

– 7 ½ hp

– 10 hp

– 15 hp

– 20 hp

– 25 hp

– 30 hp

Motor rpm 60 Hz

– 1200A B C

– 1800

– 3600

50 Hz

– 1000D

E F

– 1500

– 3000

Motor Type

XL (Across-the-Line)

– Open Drip ProofA

B C

– Totally Enclosed, Non-Ventilated

– Totally Enclosed, Fan-Cooled

D – Explosion Proof E – Encapsulated (Open Drip Proof Frame)

PW (Part-Wind)

– Open Drip Proof

– Totally Enclosed, Non-Ventilated

– Totally Enclosed, Fan-Cooled

– Explosion Proof

– Encapsulated (Open Drip Proof Frame)

F G H J K

Fan Speed rpm

Safety Factor

– 1 Set Belt

1.5 Safety Factor

a46-444

Fig. 7 — Drive Package Model Number Nomenclature a46-4446

P R

E -H

E

AT

W

AT

E R

O R

P

R E

-H E

AT

S

TE

A

M

P H

W

LE

G

E N

D

F ig

. 8

P o si ti o n

, U n it

C o n fi g u ra ti o n

M o d el

(C o m p o n en t

S eq u en ce A ls o

S h o w n

C O

M B

C om bi na tio n

P H

P re he at P

O S

P os iti on

F ac to ry

-in st al le d op tio n co m po ne nt s

39LA – HORIZONTAL COOLING

LARGE FACE AREA

A B

PRIMARY COIL/FAN SECTIONS

C

39LB – HORIZONTAL COOLING

SMALL FACE AREA

A B

C

39LC – HORIZONTAL COOLING/HEATING

SMALL FACE AREA

A B

C

39LD – VERTICAL COOLING

LARGE FACE AREA

A B

C

39LF – VERTICAL COOLING/HEATING

SMALL FACE AREA

A B

C

39LG – FAN ONLY6

A B

C

39LH – VERTICAL HEATING

SMALL FACE AREA

A B

C

ACCESSORY SECTIONS

MIXING BOX8 10FILTER MIXING BOX9 FILTER MIXING BOX FLAT FILTER 11 ANGLE FILTER 12 PLENUM

13 HOT WATER

OR STEAM

PREHEAT COIL

14 ELECTRIC

PREHEAT

COIL

PREHEAT SECTIONS

Fig. 9 — Section Details

Fan Configurations

Available Configurations A Upblast Rear Discharge B Upblast Front Discharge

C Top Horizontal Front Discharge

Fan Section Access Hinged Door on Hand Side

NOTE: Item numbers refer to Table 1.

a39-4447 a39-4448

Table 1 — Section Dimensions and Weights

* Item numbers refer to Fig. 9.

SECTION DIMENSIONS (in.) AND WEIGHTS (lb)

Nominal cfm at 500 fpm 1,500 3,000 4,000 5,000 6,000 7,500 9,000 10,500 12,500

Unit Size 03 06 08 10 12 15 18 21 25

Height (in.) LA, LB, LC, LG 24.3 28.2 32.1 32.1 32.1 40.0 43.9 43.9 43.9

Height (in.) LD, LF, LH 45.5 53.3 61.3 61.3 61.3 76.9 84.8 84.8 100.6

Width (in.) 37.9 45.8 49.7 57.6 65.1 65.1 65.1 77.3 77.3

ITEM

NO.* DESCRIPTION AWL (in.)

Weight (lb)

1 39LA 40.9 48.8 56.7 56.7 56.7 72.4 80.3 80.3 76.4

200 280 411 470 540 620 695 740 820

2 39LB 29.1 33.1 37.0 37.0 37.0 44.9 48.8 48.8 56.7

150 210 308 352 405 465 521 555 615

3 39LC 37.0 40.9 44.9 44.9 44.9 52.8 56.7 56.7 64.6

170 238 349 400 459 527 590 629 697

4 39LD 21.3 25.2 29.1 29.1 29.1 37.0 40.9 40.9 48.8

230 322 472 540 621 713 799 851 943

5 39LF 21.3 25.2 29.1 29.1 29.1 37.0 40.9 40.9 48.8

230 322 472 540 621 713 799 851 943

6 39LG 21.3 25.2 29.1 29.1 29.1 37.0 40.9 40.9 48.8

120 168 246 282 324 372 417 444 492

7 39LH 21.3 25.2 29.1 29.1 29.1 37.0 40.9 40.9 48.8

220 308 452 517 594 682 764 814 902

ACCESSORIES

Unit Size 03 06 08 10 12 15 18 21 25

Height (in.) 24.3 28.2 32.1 32.1 32.1 40.0 43.9 43.9 43.9

Width (in.) 37.9 45.8 49.7 57.6 65.1 65.1 65.1 77.3 77.3

ITEM

NO.* DESCRIPTION AWL (in.)

Weight (lb)

8 Mixing Box Section 27.6 27.6 27.6 27.6 27.6 27.6 35.4 35.4 35.4 139 164 193 219 226 244 283 272 311

9 Filter Mixing Box 27.6 27.6 27.6 27.6 27.6 27.6 35.4 35.4 35.4 150 173 208 227 245 279 327 340 395

10 Flat Filter Section 7.9 7.9 7.9 7.9 7.9 7.9 7.9 7.9 7.9 37 43 48 50 55 74 75 86 90

11 Angle Filter Section 19.7 19.7 19.7 19.7 19.7 19.7 19.7 19.7 19.7 75 82 97 107 114 134 140 159 185

12 Access Section 19.7 19.7 19.7 19.7 19.7 19.7 19.7 19.7 19.7 48 55 60 64 68 74 77 87 92

13 Preheat (Hot Water or Steam) Section

7.9 7.9 7.9 7.9 7.9 7.9 7.9 7.9 7.9 36 42 43 46 49 52 54 53 57

14 Preheat (Electric) Section 19.7 19.7 19.7 19.7 19.7 19.7 19.7 19.7 19.7 49 56 61 66 72 74 76 87 89

LEGEND

AWL — Airway Length

NOTE: Unit weights do not include coils and motors.

PREINSTALLATION

1. Check items received against packing list. Notify Carrier of any discrepancy.

2. Refer to Fig. 10 for service area requirements.

3. To transfer unit from truck to storage site, refer to rigging de-tails in Fig. 11 and section on unit rigging for proper han-dling. See Tables 1 and 2 for section and component weights.

4. Do not stack unit components or accessories during storage.

Stacking can cause damage or deformation.

5. If unit is to be stored for more than 2 weeks prior to installa-tion, observe the following precautions:

a. Choose a dry storage site that is reasonably level and sturdy to prevent undue stress or permanent damage to the unit structure or components. Do not store unit on vibrating surface. Damage to stationary bearings can occur. Set unit off ground if in heavy rain area.

b. Remove all fasteners and other small parts from job-site to minimize theft. Tag and store parts in a safe place until needed.

c. Cover entire unit with a tarp or plastic coverall.

Extend cover under unit if stored on ground. Secure cover with adequate tiedowns or store indoors. Be sure all coil connections have protective shipping caps.

d. Monthly — Remove tarp from unit, enter fan sec-tion through access door or through fan inlet, and rotate fan and motor slowly by hand to redistribute the bearing grease and to prevent bearing corrosion.

Rigging (Fig. 11) — All 39L units can be rigged by means of the lifting brackets on bottom of unit.

Units are shipped fully assembled. Do not remove shipping skids or protective covering until unit is ready for final placement.

Use slings and spreader bars as applicable to lift unit. Do not lift unit by coil connections or headers.

Do not remove protective caps from coil piping connections until ready to connect piping.

Do not remove protective cover or grease from fan shaft until ready to install sheave.

Lay rigid temporary protection such as plywood walkways in unit to prevent damage to insulation or bottom panel during instal-lation.

Suspended Units — Figure 12 shows overhead suspension of unit using optional factory-supplied suspension channels.

Each support channel consists of 2 pieces, the smaller of which fits inside the larger one. This allows the channel to be adjusted to the required length for installation.

Channels are shipped on top of the unit. The 2 sections of each channel are shipped one inside the other, and are held in place during shipping by the panel screws in the top panel.

Hardware required for installation of suspension channels is shipped in a package inside the fan section.

At least 2 suspension channels are shipped with each fan and coil unit. One or more extra channels will be supplied depending on the number of accessories ordered. Be sure to install all the sus-pension channels shipped with a unit. Refer to 39L Isolator Mounting (Suspended Unit) certified drawing for details.

To install suspension channels:

1. Remove panel screws to free suspension channels for instal-lation. Replace screws in top panel.

2. Adjust channel to required length by sliding one channel sec-tion inside the other. The channel must extend at least 9 in.

but not more than 12 in. beyond the edge of the unit. Set length of channel by installing factory-supplied bolts through the overlapping channel sections.

3. Mount unit to suspension channel using factory-supplied nuts and bolts through 7/16-in. diameter holes in unit lifting bracket.

4. Install field-supplied suspension rods through 9/16-in. diame-ter holes provided at outer edges of channel. Be sure hanger rods are securely fastened in place.

Service Clearance — Provide adequate space for unit ser-vice access (fan shaft and coil removal, filter removal, motor ac-cess, damper linkage access, etc.) as shown in Fig. 10.

Condensate Drain — To prevent excessive build-up of condensate in drain pan, adequate trap clearance must be provided beneath the unit. See Installation, Condensate Drain section on page 16 for additional details.

External Vibration Isolators — Install vibration isola-tors per certified drawings, and in accordance with the job specifi-cations and the instructions of the vibration isolator manufacturer.

The coil piping must be isolated or have a flexible connection to avoid coil header damage because of unit motion. A flexible con-nection should be installed at the fan discharge.

Fig. 12 and 13 show isolation location for overhead suspension or floor mounting of unit.

CAUTION

If a fork lift truck is used, lift only from heavy end of skid.

Minimum recommended fork length is 48 inches.

NOTE: Dimensions are in inches, ( ) are in mm.

DIMENSIONS (ft-in.)

SIZE A B C

D

E

39LA 39LB 39LC

03 3-17/8 3-13/4 1-91/4 1- 711/16 0-77/8 1-33/4 2- 39/16

06 3-93/4 3-95/8 2-13/16 1-115/8 0-77/8 1-33/4 2- 39/16

08 4-111/16 4-19/16 2-51/8 2- 39/16 0-77/8 1-33/4 2- 39/16

10 4-99/16 4-97/16 2-51/8 2- 39/16 0-77/8 1-33/4 2- 39/16

12 5-51/16 5-55/16 2-51/8 2- 39/16 0-77/8 1-33/4 2- 39/16

15 5-51/16 5-55/16 3-1 2-119/16 0-77/8 1-33/4 2- 39/16

18 5-51/16 5-55/16 3-415/16 3- 33/8 0-77/8 1-33/4 2-117/16

21 6-51/4 6-51/8 3-415/16 3- 33/8 0-77/8 1-33/4 2-117/16

25 6-51/4 6-51/8 4-015/16 2- 39/16 0-77/8 1-33/4 2-117/16

DIMENSIONS (mm)

SIZE A B C

D

E

39LA 39LB 39LC

03 952 959 540 500 200 400 700 06 1162 1159 640 600 200 400 700 08 1262 1259 740 700 200 400 700 10 1462 1459 740 700 200 400 700 12 1653 1659 740 700 200 400 700 15 1653 1659 940 900 200 400 700 18 1653 1659 1040 1000 200 400 900 21 1962 1959 1040 1000 200 400 900 25 1962 1959 1240 700 200 400 900

Fig. 10 — Service Area Requirements

Table 2 — Additional Component Weights

LEGEND

*Coils have 14 aluminum fins per inch on copper tubes.

NOTE: See Table 1 for section weights and dimensions.

UNIT SIZE 03 06 08 10 12 15 18 21 25

TYPICAL DRY COIL WEIGHTS (lb) Large Face Area Cooling Coils, 1/2-in. OD (Chilled Water & DX)* 4-Row 56 84 98 109 137 178 198 251 280 6-Row 63 95 123 138 174 234 270 327 363

Small Face Area Cooling Coils, 1/2-in. OD (Chilled Water & DX)* 4-Row 45 72 91 105 133 161 182 211 238 6-Row 53 85 113 129 162 197 225 270 307 8-Row 61 92 129 143 189 228 263 324 377

Hot Water Coils, 1/2-in. OD* 1-Row 19 34 38 48 58 62 77 86 95 2-Row 28 43 51 61 76 89 104 117 130

Steam Coils, 1-row, 1-in. OD

6-FPI 50 70 85 95 110 135 150 180 215

9-FPI 55 80 100 115 125 155 175 214 256

12-FPI 60 85 115 130 145 180 205 248 297

FAN

Wheel Diameter (in.) 91/2 125/8 125/8 15 15 181/8 20 20 25 Wheel Width (in.) 71/8 91/2 111/8 111/8 15 15 131/2 18 15 Shaft Diameter (in.) 3/4 13/16 13/16 13/16 13/16 17/16 17/16 17/16 111/16 Maximum Fan Rpm 2500 2000 2000 1600 1600 1400 1300 1100 1000

OPERATING CHARGE (Approximate), DIRECT EXPANSION COIL

Refrigerant R-410A or R-22 (lb)

4-Row Coil 1-2 2-3 3-4 4-5 4-5 5-6 6-7 6-8 6-9 6-Row Coil 1-2 2-4 5-6 5-6 6-8 8-10 9-11 11-13 11-16 8-Row Coil 2-3 3-5 5-6 5-7 7-9 10-12 12-14 13-19 16-24

COIL VOLUME (gal. water) Chilled Water, 1/2-in. OD Tube, Large Face Area 4-Row 2.5 3.5 4.5 5.2 5.6 7.3 8.5 10.4 12.0 6-Row 3.2 4.7 6.0 6.8 7.7 10.1 11.7 14.2 16.3

Chilled Water, 1/2-in. OD Tube, Small Face Area

4-Row 2.1 3.3 3.9 4.1 5.1 6.3 7.3 8.7 9.8 6-Row 2.4 3.7 5.1 5.9 6.6 8.3 9.5 11.8 13.5 8-Row 2.7 4.1 6.4 7.4 8.4 10.7 12.1 14.7 17.2

Hot Water, 1/2-in. OD Tube 1-Row 0.5 0.8 1.0 1.3 1.5 1.8 2.1 2.5 2.9 2-Row 0.7 1.3 1.6 2.0 2.4 2.9 3.4 4.0 4.8

COOLING COILS

Chilled Water 1/2-in. OD Tube, (4, 6 Row) Large Face Area

Face Area (sq ft) 3.63 5.90 7.90 9.54 11.18 14.91 17.71 21.6 25.0 Number of Tubes/Face 16 20 24 24 24 32 38 38 44 Finned Tube Length (in.) 26.1 34.0 37.9 45.8 53.7 53.7 53.7 65.5 65.5

Chilled Water 1/2-in. OD Tube (4, 6, 8 Row) Small Face Area Face Area (sq ft) 2.72 4.72 6.58 7.95 9.32 12.12 13.98 17.1 20.5 Number of Tubes/Face 12 16 20 20 20 26 30 30 36 Finned Tube Length (in.) 26.1 34.0 37.9 45.8 53.7 53.7 53.7 65.5 65.5

DX 1/2-in. OD Tube (4, 6 Row) Large Face Area

Face Area (sq ft) 3.63 5.90 7.90 9.54 11.18 14.91 17.71 21.6 25.0 Finned Tube Length (in.) 26.1 34.0 37.9 45.8 53.7 53.7 53.7 65.5 65.5

DX 1/2-in. OD Tube (4, 6, 8 Row) Small Face Area Face Area (sq ft) 2.72 4.72 6.58 7.95 9.32 12.12 13.98 17.1 20.5 Finned Tube Length (in.) 26.1 34.0 37.9 45.8 53.7 53.7 53.7 65.5 65.5

HEATING COILS

Hot Water 1/2-in. OD Tube, U-Bend (1, 2 Row) Face Area (sq ft) 2.72 4.72 6.58 7.95 9.32 12.12 13.98 17.1 20.5 Number Tubes/Face 12 16 20 20 20 26 30 30 36 Finned Tube Length (in.) 26.1 34.0 37.9 45.8 53.7 53.7 53.7 65.5 65.5

Steam 1-in. OD (1 Row) Face Area (sq ft) 2.13 4.18 6.22 7.53 8.85 11.06 13.28 16.2 18.9 Number Tubes/Face 4 6 8 8 8 10 12 12 14 Finned Tube Length (in.) 25.5 33.4 37.3 45.2 53.1 53.1 53.1 53.1 64.9

DX — Direct Expansion FPI — Fins Per Inch

SPREADER

BAR

LIFTING

BRACKET

Fig. 11 — Unit Rigging Details

NOTE: Lift in one piece. Use slings and spreader bars at each lifting bracket.

a39-4449

LIFTING BRACKET

DETAILS

16/ IN. DIAM. HOLE

VIBRATION ISOLATORS

(FIELD SUPPLIED)

SUSPENSION ROD

(FIELD SUPPLIED)

SUSPENSION CHANNEL

(FACTORY-SUPPLIED OPTION)

MOUNT UNIT TO SUSPENSION CHANNELS

THROUGH

PROVIDED IN LIFTING BRACKET

16/ IN. DIAM. HOLES

FACTORY-SUPPLIED BOLTS

CONNECTING SUSPENSION

CHANNEL SECTIONS

OVERHEAD SUSPENSION

a3 - 450

Fig. 12 — Unit Support Details, Overhead Suspension a39-4450

SPRING ISOLATOR

ISOLATION BRACKET

16/ IN. DIAM. HOLE

ISOLATION DETAIL – FLOOR MOUNT

Fig. 13 — Unit Support Details, Floor Mount a38-4451

INSTALLATION

Base Rail Split — A base rail split between the primary coil/ fan section and the accessory sections is optional. If this option has ben selected, the 39L unit will arrive at the job site assembled as one piece. The split allows the unit to be separated at the joint.

If the unit must be separated in the field, follow this procedure:

1. Remove the lifting lugs on the inlet side of the coil/fan sec-tion and those on the outlet side of the accessory section to liberate the T-bracket. See Fig 14.

2. Unscrew the flanges (top and sides) around the coil/fan sec-tion and the accessory section. See Fig. 15.

NOTE: If the section-to-section gasket installed at the factory is damaged while splitting the unit, obtain the required length of 1/8

in. x 1 1/4 in. foam gasketing locally.

After rejoining the split sections, fully tighten all AB 1/4 in.-3/4 in.

screws on the flanges and the AB 1/4 in-5/8 in. screws on the flanges. See Fig. 16.

CAUTION

Ensure that a good seal is created between both sections before continuing. A poor seal may result in equipment dam-age.

T-BRACKET

LIFTING LUG

a3 4 53

Fig. 14 — Base Rail Split — T-Bracket a39-4453

FLANGES

FLANGES

Fig. 15 — Base Rail Split — Flanges a39-4454

AB ¼- 5 8/ SCREWS

AB ¼-¾ SCREWS

Fig. 16 — Base Rail Split — Screws a39-4455

Mixing Box DAMPER ACTUATORS — The 39L mixing boxes are supplied with low leak dampers and blade and edge seals. Damper operat-ing torques are shown in Table 3.

The actuator and mounting brackets are field supplied and may be mounted inside or outside the unit. A typical inside mounting bracket is shown in Fig. 17. For external mounting of actuators, drill or punch a hole in the exterior panel.

NOTE: If the unit is shipped with AirManager™ controls, actua-tor(s) are factory-supplied. Refer to Table 4.

To ensure torque is transmitted equally to both damper sec-tions, actuator must be connected to the 1-in. hollow jackshaft that drives the interconnecting linkage bar. Connection to any other shaft is not recommended.

DUCTWORK ATTACHMENT — Ductwork should be flanged out and attached to the mixing box panels as shown in Fig.

18. See Fig. 19 for duct connection sizes.

Table 3 — Mixing Box Damper Operating Torque (in.-lb)

NOTES:

1. Torque values are based on interconnected dampers driven by one operator. For units with separate operators for each damper, calcu-late torque as follows: Table values x .80 = torque per damper sec-tion.

2. Damper shaft moves 90 degrees from open to closed position.

39L UNIT SIZE TORQUE

03 20 06 20 08 26 10 29 12 33 15 41 18 52 21 56 25 76

MXB — Mixing Box

Fig. 18 — Mixing Box Ductwork Attachment

Fig. 17 — Typical Mixing Box Actuator Mounting

Table 4 — Recommended Actuators

*Actuator is spring-return type.

NOTES:

1. All actuators are direct coupled type, designed to be directly mounted into jackshaft assembly.

2. All actuators are equipped with a plenum rated cable, factory-ter-minated to the actuator. Part No. HF27BB035 and 034 are 16 ft, HF27BB033 is 9.5 ft.

3. Damper areas are nominal and based on low leakage type damp-ers.

4. For larger damper assemblies, multiple activators may be used.

5. Part No. HF27BB033 and 034 are designed for inlet guide vane and face and bypass applications, but may be used for external relief dampers if spring return is not required.

ACCESSORY

PACKAGE

NO.

ACTUATOR

PART NO.

VOLTAGE

(50/60 Hz) VA

ROUND

SHAFT

SIZE

MIN-MAX

(in.)

TIMING

(sec)

DAMPER AREA

(sq ft) TORQUE

(in.-lb)

MAXIMUM

STROKE

(degrees)

MAXIMUM

WIRE

LENGTH

(ft)Parallel Opposed

33AMACTDMP133 HF27BJ035* 24 10 0.750-1.050 150 44 53 133 90 300

33AMACTGV-133 HF27BJ033 24 4 0.375-0.625 < 150 N/A N/A 133 90 725

33AMACTGV-266 HF27BJ034 24 6 0.475-0.750 135 N/A N/A 266 90 450

DIMENSIONS (ft-in.)

Fig. 19 — Mixing Box Duct Connections

UNIT

39L- A B C D E F G H J K L

03 2- 39/16 3-17/8 2-01/4 1- 5 1-5 0- 15/8 0-61/16 0-101/2 1-43/4 1-51/4 1- 51/4 06 2- 39/16 3-93/4 2-43/16 1-11 1-5 0- 41/8 0-61/16 0-113/8 1-811/16 2-11/4 1- 71/4 08 2- 39/16 4-111/16 2-81/8 3- 1 1-5 0- 61/16 0-61/16 0- 63/8 2-05/8 3-31/4 1- 71/4 10 2- 39/16 4-99/16 2-81/8 3- 5 1-5 0- 61/16 0-61/16 0- 85/16 2-05/8 3-71/4 1- 71/4 12 2- 39/16 5-57/16 2-81/8 3-11 1-5 0- 61/16 0-61/16 0- 91/4 2-05/8 4-11/4 1- 71/4 15 2- 39/16 5-57/16 3-4 3-11 1-9 0- 8 0-41/16 0- 91/4 2-81/2 4-11/4 1-111/4 18 2-117/16 5-57/16 3-715/16 3-11 2-3 0- 7 0-5 0- 91/4 3-07/16 4-11/4 2- 51/4 21 2-117/16 6-51/4 3-715/16 3-11 2-5 0- 6 0-4 1- 31/8 3-07/16 4-11/4 2- 71/4 25 2-117/16 6-51/4 4-313/16 5- 4 2-5 0- 97/8 0-4 0- 65/8 3-85/16 5-61/4 2- 71/4

NOTES:

1. Hand is determined by the location of the fan drive and/or coil connection when viewed while facing the direction toward which air is flowing.

2. Dimensions are in inches, ( ) are in millimeters.

Condensate Drain — Install a trapped condensate drain line at unit drain connection. Use 1-in. standard pipe.

Measure maximum design negative static pressure up-stream from the fan. Referring to Fig. 20, height “H” must be equal to or larger than negative static pressure at design operat-ing conditions. Prime enough water in trap to prevent losing seal (Differential 1). When the fan starts, Differential 2 is equal to the maximum negative static pressure.

Provide freeze-up protection and insulation as required.

Variable Frequency Drive (VFD) — Variable fre-quency drives (VFDs) are used to modulate fan motor speed in response to air volume requirements. To vary the motor speed, a VFD changes the input frequency and line voltage into a wide range of frequency and voltage outputs, while maintain-ing a constant ratio of frequency to voltage.

Since 2001, all 1-hp and greater motors supplied by Carrier for the 39L series air handling units are designed and construct-ed for use with variable frequency drives. If a field-supplied motor is installed, ensure the motor is suitable for use with a

VFD.

If the lead length from the VFD to the motor is greater than 25 ft, Shaft Grounding Rings (SGR) are necessary to help dis-sipate induced shaft voltages to ground and prevent motor bearing damage.

Install Fan Motor — For field installation of motors, be sure electrical junction box is toward the center of the unit.

This is necessary for drive and belts to be properly tightened.

Use smallest slots in motor mounting base that will accommo-date motor and allow minimum overhang (Fig. 21). Be sure that motor holddown bolts are tight on field-installed motor.

JUNCTION BOX CONDENSATE PREVENTION —

When air handlers are installed outdoors in a high humidity environment or indoors where the apparatus room is used as a fresh air plenum, precautions must be taken to prevent conden-sation from forming inside the junction box of the internally mounted motor.

Standard installation practice is to mount the motor starter or fused disconnect box adjacent to the air handler and enclose the power wiring to the motor in flexible conduit.

The sheet metal housing of the disconnect switch or motor starter is not airtight (even when a box meeting NEMA [National Electrical Manufacturers Association] IV standards is used). Thus, warm moist air can migrate through the flexible conduit to the junction box on the motor. With the motor located inside the unit, the motor temperature is that of the cool supply air; thus, condensate can form inside the junction box and, possibly, on the live terminal lugs.

To prevent the moist air from migrating through the conduit to the motor, seal the power wires inside the flexible conduit at the motor starter or fused disconnect.

Use a nonconductive, nonhardening sealant. Permagum (manufactured by Schnee Morehead) or sealing compound, thumb grade (manufactured by Calgon), are acceptable materials.

POWER KNOCKOUTS — Panels are not provided with knockouts for the fan motor power wiring. Openings must be drilled or punched in the exterior panels of the unit. It is recom-mended that power wiring be routed through the discharge panel whenever possible, as this panel is rarely removed for service access.

Install Sheaves on Motor and Fan Shafts — Factory-supplied drives are prealigned and tensioned, however, Carrier recommends that you check the belt tension and align-ment before starting the unit. Always check the drive align-ment after adjusting belt tension.

When field installing or replacing sheaves, install sheaves on fan shaft and motor shaft for minimum overhang. (See Fig. 21.) Use care when mounting sheave on fan shaft; too much force may damage bearing. Remove rust-preventative coating or oil from shaft. Make sure shaft is clean and free of burrs. Add grease or lubricant to bore of sheave before installing.

The 39L fan, shaft, and drive pulley are balanced as a com-plete assembly to a high degree of accuracy. If excessive unit vibration is present after fan pulley replacement, the unit must be rebalanced. For drive ratio changes, always reselect the mo-tor pulley — do not change the fan pulley.

ALIGNMENT — Make sure that fan shafts and motor shafts are parallel and level. The most common causes of mis-alignment are nonparallel shafts and improperly located sheaves. Where shafts are not parallel, belts on one side are drawn tighter and pull more than their share of the load. As a result, these belts wear out faster, requiring the entire set to be replaced before it has given maximum service. If misalignment is in the sheave, belts will enter and leave the grooves at an angle, causing excessive belt cover and sheave wear.

1. Shaft alignment can be checked by measuring the distance between the shafts at 3 or more locations. If the distances are equal, then the shafts will be parallel.

2. Sheave alignment:

Fixed sheaves — To check the location of the fixed sheaves on the shafts, a straightedge or a piece of string can be used. If the sheaves are properly lined up the string will touch them at the points indicated by the arrows in Fig. 22.

Adjustable sheave — To check the location of adjustable sheave on shaft, make sure that the centerlines of both sheaves are in line and parallel with the bearing support channel. See Fig. 22. Adjustable pitch drives are installed on the motor shaft.

3. Rotating each sheave a half revolution will determine whether the sheave is wobbly or the drive shaft is bent.

Correct any misalignment.

FAN OFF

TRAP CONDITION WHEN FAN STARTS

FAN RUNNING AND CONDENSATE DRAINING

DIFFERENTIAL

DRAIN NIPPLE

DIFFERENTIAL

COOLING COIL

DRAIN PAN

H

Fig. 20 — Condensate Drain

CAUTION

With adjustable sheave, do not exceed maximum fan rpm.

4. With sheaves aligned, tighten cap screws evenly and pro-gressively.

NOTE: There should be a 1/8-in. to 1/4-in. gap between the mating part hub and the bushing flange. If gap is closed, the bushing is probably the wrong size.

5. With taper-lock bushed hubs, be sure the bushing bolts are tightened evenly to prevent side-to-side pulley wobble.

Check by rotating sheaves and rechecking sheave alignment.

When substituting field-supplied sheaves for factory-sup-plied sheaves, consider that the fan shaft sheave has been factory balanced with fan and shaft as an assembly. For this reason, substitution of motor sheave is preferable for final speed adjustment.

Install V-Belts — When installing or replacing belts, always use a complete set of new belts. Mixing old and new belts will re-sult in the premature wear or breakage of the newer belts.

Refer to label on inside of fan access door for information on factory-supplied drive.

1. Always adjust the motor position so that V-belts can be in-stalled without stretching over grooves. Forcing belts can re-sult in uneven stretching and a mismatched set of belts.

2. Do not allow belt to bottom out in sheave.

3. Tighten belts by turning motor-adjusting jackscrews. Turn each jackscrew an equal number of turns.

4. Equalize belt slack so that it is on the same side of belt for all belts. Failure to do so may result in uneven belt stretching.

5. Tension new drives at the maximum deflection force recom-mended (Table 5).

On current production, the correct tension information is list-ed on the fan drive label. For older equipment or units with field-modified drives, use the deflection formula in the fol-lowing example and the tension data from Table 5.

EXAMPLE:

Given

Belt Span 16 in.

Belt Cross-Section A, Super Belt Small Sheave PD 5 in.

Solution

a. From Table 5 find that deflection force for a new type

A, super belt with 5-in. small sheave PD is 8 lb.

b.

Tension Measurement Procedure

1. Measure the belt span (see Fig. 23).

2. Position bottom of the large O-ring on the span scale at the measured belt span.

Fig. 21 — Determining Sheave-Shaft Overhang

Fig. 22 — Sheave Alignment Deflection = (Belt Span)

Deflection = 16

3. Set the small O-ring on the deflection force scale to zero.

4. Place the tension checker squarely on one belt at the cen-ter of the belt span. Apply a force on the plunger and per-pendicular to the belt span until the bottom of the large O-ring is even with the top of the adjacent (next) belt or with the bottom of a straight edge laid across the outside diam-eters of the v-belt sheaves.

5. Remove the tension checker and read the force applied from the bottom of the small O-ring on the deflection force scale.

6. Compare the force you have applied with the values giv-en in Table 5. The force should be between the “Used Belt” and “New Belt” values shown. The maximum val-ue is shown for “New Belt” and new belts should be ten-sioned at this value to allow for expected tension loss.

“New Belt” tensions should be used at initial installation and after job start or 1 to 3 minutes of operation. Used belts should be maintained at the value as indicated in the chart. “Used Belt” tensions should be used for the 8-hour and subsequent checks. If the belt span was measured in centimeters, then use the kilograms of force values for comparison.

NOTE: The ratio of deflection to belt span is 1:64 in either unit of measurement.

Whenever possible, jog start for a few revolutions or prefer-ably run drive for approximately 1 to 3 minutes and then re-tension in accordance with Steps 1-6. Running the drive for a few revolutions or minutes will help seat the belt(s) in the groove(s). This relatively early re-tensioning may reduce or minimize the amount of re-tensioning required in the first 24 hours of drive service. Record information on the label (Fig. 24) found on the door of the fan section.

Table 5 — Fan Belt Tension Data

SHEAVE DIAMETER (in.)

DEFLECTION FORCE (lb)

BELT STYLE

SMALLEST

SHEAVE DIAMETER

RANGE

RPM RANGE

BELT DEFLECTION FORCE

SUPER GRIPBELTS AND UNNOTCHED

GRIPBANDS

GRIPNOTCH BELTS AND NOTCHED

GRIPBANDS

USED BELT NEW BELT USED BELT NEW BELT

A, AX

3.0 - 3.6 1000-2500 2501-4000

3.7 2.8

5.5 4.2

4.1 3.4

6.1 5.0

3.8 - 4.8 1000-2500 2501-4000

4.5 3.8

6.8 5.7

5.0 4.3

7.4 6.4

5.0 - 7.0 1000-2500 2501-4000

5.4 4.7

8.0 7.0

5.7 5.1

8.4 7.6

B, BX

3.4 - 4.2 860-2500 2501-4000

4.9 4.2

7.2 6.2

4.4 - 5.6 860-2500 2501-4000

5.3 4.5

7.9 6.7

7.1 6.1

10.5 9.1

5.8 - 8.6 860-2500 2501-4000

6.3 6.0

9.4 8.9

8.5 7.3

12.6 10.9

C, CX

7.0 - 9.0 500-1740

1741-3000 11.5 9.4

17.0 13.8

14.7 11.9

21.8 17.5

9.5 - 16.0 500-1740 1741-3000

14.1 12.5

21.0 18.5

15.9 14.6

23.5 21.6

D

12.0 - 16.0 200-850

851-1500 24.9 21.2

37.0 31.3

18.0 - 20.0 200-850 851-1500

30.4 25.6

45.2 38.0

3V, 3VX

2.2 - 2.4 1000-2500 2501-4000

3.3 2.9

4.9 4.3

2.65 - 3.65 1000-2500 2501-4000

3.6 3.0

5.1 4.4

4.2 3.8

6.2 5.6

4.12 - 6.90 1000-2500 2501-4000

4.9 4.4

7.3 6.6

5.3 4.9

7.9 7.3

5V, 5VX

4.4 - 6.7 500-1749 1750-3000 3001-4000

10.2 8.8 5.6

15.2 13.2 8.5

7.1 - 10.9 500-1749 1750-3000 3001-4000

12.7 11.2

18.9 16.7

14.8 13.7

22.1 20.1

11.8 - 16.0 500-1749 1750-3000 3001-4000

15.5 14.6

23.4 21.8

17.1 16.8

25.5 25.0

8V

12.5 - 17.0 200-850

851-1500 33.0 26.8

49.3 39.9

18.0 - 22.4 200-850 851-1500

39.6 35.3

59.2 52.7

Water and Steam Coil Piping Recommendations GENERAL — Use straps around the coil casing or the lifting holes (see Fig. 25) to lift and place the coil.

Piping practices are outlined in the Carrier System Design Man-ual, Part 3, Piping Design. See Tables 6-7 for circuiting data.

WATER COILS — Typically, coils are piped by connecting the supply at the bottom and the return at the top. See Fig. 25. This is not always the case, especially if the coil hand has been changed in the field. Coils must be piped for counterflow; otherwise, a ca-pacity reduction of 5% for each coil row will result. To ensure counterflow, chilled water coils are piped so that the coldest water meets the coldest air. Hot water coils are piped so that the warmest water meets the warmest air.

STEAM COILS — Position the steam supply connection at the top of the coil, and the return (condensate) connection at the bot-tom. The coil tubes must incline downwards toward the return header connection for condensate drainage. See Fig. 26-30 and Table 8.

Figure 26 illustrates the normal piping components and the suggested locations for high, medium, or low-pressure steam coils. The low-pressure application (zero to 15 psig) can dispense with the ¼-in. petcock for continuous venting located above the vacuum breaker (check valve).

S

PA

N

IN

C

H E

S

S

PA

N

IN

C

H E

S

S P

AN

IN

C H

ES

DEFLECTION

FORCE

(LB.)

SMALL

“O” RING

SPAN SCALE

STRAIGHT

EDGE

LARGE “O” RING

V-BELT

ADJACENT

V-BELT

BELT

SPAN

Fig. 23 — Fan Belt Tension

Fig. 24 — Fan Section Label

NOTICE

TENSION BELTS TO SPECIFICATION

SHOWN ON DRIVE LABEL. OVER

TENSIONING BELTS WILL SEVERELY

REDUCE BELT AND BEARING LIFE.

REPLACEMENT PARTS

BEARINGS

DRIVE ________________________

FREE _________________________

SHAFT _________________________

WHEEL _________________________

INLET CONE ____________________

TO ORDER REPLACEMENT PARTS,

CONTACT: RCD

(REPLACEMENT COMPONENTS DIVISION)

1-800-443-4410

CAUTION

To prevent damage to the coil or coil headers: Do not use the headers to lift the coil. Support the piping and coil connections independently. Do not use the coil connections to support pip-ing. When tightening coil connections, use a backup wrench on the nozzles.

Note the horizontal location of the 15-degree check valve, and the orientation of the gate/pivot. This valve is intended to relieve any vacuum forming in the condensate outlet of a condensing steam coil, and to seal this port when steam pressure is again sup-plied to the coil. It must not be installed in any other position, and should not be used in the supply line.

For coils used in tempering service, or to preheat outside air, in-stall an immersion thermostat in the condensate line ahead of the trap. This will shut down the supply fan and close the outdoor damper whenever the condensate falls to a predetermined point, perhaps 120 F.

NOTE: Do NOT use an immersion thermostat to override a duct thermostat and open the steam supply valve.

For vacuum return systems, the vacuum breaking check valve would be piped into the condensate line between the trap and the gate valve instead of open to the atmosphere.

Figure 27 illustrates the typical piping at the end of every steam supply main. Omitting this causes many field problems and failed coils.

Figure 28 shows the typical field piping of multiple coils. Use this only if the coils are the same size and have the same pressure drop. If this is not the case, an individual trap must be provided for each coil.

Figure 29 shows a multiple coil arrangement applied to a grav-ity return, including the open air relief to the atmosphere, which DOES NOT replace the vacuum breakers.

Figure 30 illustrates the basic condensate lift piping.

Following the piping diagrams in Fig. 26-30, make all connec-tions while observing the following precautions:

• Install a drip line and trap on the pressure side of the inlet control valve. Connect the drip line to the return line down-stream of the return line trap.

• To prevent scale or foreign matter from entering the control valve and coil, install a 3/32-in. mesh strainer in the steam supply line upstream from the control valve.

• Provide air vents for the coils to eliminate noncondensable gases.

• Select a control valve according to the steam load, not the coils supply connection size. Do not use an oversized con-trol valve.

• Do not use bushings that reduce the size of the header return connection. The return connection should be the same size as the return line and reduced only at the down-stream trap.

• To lift condensate above the coil return line into overhead steam mains, or pressurized mains, install a pump and receiver between the condensate trap and the pressurized main. Do not try to lift condensate with modulating or on-and-off steam control valves. Use only 15-degree check valves, as they open with a lower water head. Do not use 45-degree or vertical-lift check valves.

• Use float and thermostatic traps. Select the trap size accord-ing to the pressure difference between the steam supply main and the return main.

• Load variations can be caused by uneven inlet air distribu-tion or temperature stratification.

• Drain condensate out of coils completely at the end of the heating season to prevent the formation of acid.

Table 6 — Hot Water Coil Circuiting Data

LEGEND

NOTE: All hot water coils have 11/2-in. MPT.

Fig. 25 — Coil Connections and Lifting Points

39L UNIT SIZE 03 06 08 10 12 15 18 21 25

No. of Circuits

1-ROW H 6 8 10 10 10 13 15 15 13

2-ROW H

F

6 8 10 10 10 13 15 15 13 12 16 20 20 20 26 30 30 36

F — Full Circuit H — Half Circuit

Table 7 — Chilled Water Coil Circuiting Data

LEGEND NOTES:

1. Connection sizes are MPT — inches.

2. Sizes 21-25 have 2 coils.

Table 7 — Chilled Water Coil Circuiting Data (cont)

LEGEND *Not available on 39LB units.

NOTE: Connection sizes are MPT - inches.

LARGE FACE AREA (39LA, 39LD)

COIL

TYPE CIRCUIT

UNIT SIZE

03 06 08 10 12

Face Area (sq ft)

3.63 5.90 7.90 9.54 11.18

No.

Circuits

Connection Size

No.

Circuits

Connection Size

No.

Circuits

Connection Size

No.

Circuits

Connection Size

No.

Circuits

Connection Size

4-ROW

Q 4 11/2 5 11/2 — — — — — — H 8 11/2 10 11/2 12 11/2 12 11/2 12 11/2 F 16 11/2 20 11/2 24 21/2 24 21/2 24 21/2 D — — — — — — — — — —

6-ROW

H 8 11/2 10 11/2 12 11/2 12 11/2 12 11/2 F 16 11/2 20 11/2 24 21/2 24 21/2 24 21/2 D — — — — 36 21/2 36 21/2 36 21/2

LARGE FACE AREA (39LA, 39LD)

COIL

TYPE CIRCUIT

UNIT SIZE

15 18 21 25

Face Area (sq ft)

14.91 17.71 21.60 25.00

No.

Circuits

Connection Size

No.

Circuits

Connection Size

No.

Circuits

Connection Size

No.

Circuits

Connection Size

4-ROW

Q — — — — — — — — H 16 11/2 19 11/2 19 11/2 22 11/2 F 32 21/2 38 21/2 38 21/2 44 21/2 D — — — — 76 21/2 88 21/2

6-ROW

H 16 11/2 19 11/2 19 11/2 — — F 32 21/2 38 21/2 38 21/2 44 21/2 D 48 21/2 57 21/2 57 21/2 66 21/2

D — Double Circuit F — Full Circuit H — Half Circuit Q — Quarter Circuit

SMALL FACE AREA (39LB, 39LC, 39LF)

COIL

TYPE CIRCUITING

UNIT SIZE

03 06 08 10 12

Face Area (sq ft)

2.72 4.72 6.58 7.95 9.23

No.

Circuits

Connection Size

No.

Circuits

Connection Size

No.

Circuits

Connection Size

No.

Circuits

Connection Size

No.

Circuits

Connection Size

4-ROW

Q 3 11/2 4 11/2 — — — — — — H 6 11/2 8 11/2 10 11/2 10 11/2 10 11/2 F 12 11/2 16 11/2 20 21/2 20 21/2 20 21/2 D — — — — — — — — — —

6-ROW

H 6 11/2 8 11/2 10 11/2 10 11/2 10 11/2 F 12 11/2 16 11/2 20 21/2 20 21/2 20 21/2 D — — — — 30 21/2 30 21/2 30 21/2

8-ROW*

H 6 11/2 8 11/2 10 11/2 10 11/2 10 11/2 F 12 11/2 16 11/2 20 21/2 20 21/2 20 21/2 D — — — — 40 21/2 40 21/2 40 21/2

SMALL FACE AREA (39LB, 39LC, 39LF)

COIL

TYPE CIRCUITING

UNIT SIZE

15 18 21 25

Face Area (sq ft)

12.12 13.98 17.10 20.50

No.

Circuits

Connection Size

No.

Circuits

Connection Size

No.

Circuits

Connection Size

No.

Circuits

Connection Size

4-ROW

Q — — — — — — — — H 13 11/2 15 11/2 15 11/2 18 11/2 F 26 21/2 30 21/2 30 21/2 36 21/2 D — — — — 60 21/2 72 21/2

6-ROW

H 13 11/2 15 11/2 15 11/2 — 11/2 F 26 21/2 30 21/2 30 21/2 36 21/2 D 39 21/2 45 21/2 45 21/2 54 21/2

8-ROW*

H 13 11/2 13 11/2 — 11/2 — 11/2 F 26 21/2 30 21/2 30 21/2 36 21/2 D 52 21/2 60 21/2 60 21/2 72 21/2

D — Double Circuit F — Full Circuit H — Half Circuit Q — Quarter Circuit

Table 8 — Steam Coil Connection Sizes

LEGEND

NOTE: Connection sizes are MPT - inches.

Coil Freeze-Up Protection WATER COILS — If a chilled water coil is applied with out-side air, provisions must be made to prevent coil freeze-up.

Install a coil freeze-up thermostat to shut down the system if any air temperature below 36 F is encountered entering the water coil. Follow thermostat manufacturer’s instructions.

When a water coil is applied downstream of a direct-expansion (DX) coil, a freeze-up thermostat must be installed between the DX and water coil and electrically interlocked to turn off the cooling to prevent freeze-up of the water coil.

For outdoor-air application where intermittent chilled water coil operation is possible, one of the following steps should be taken:

• Install an auxiliary blower heater in cabinet to maintain above-freezing temperature around coil while unit is shut down.

• Drain coils and fill with an ethylene glycol solution suit-able for the expected cold weather operation. Shut down the system and drain coils. See Service section, Winter Shutdown, page 36.

STEAM COILS — When used for preheating outdoor air in pressure or vacuum systems, an immersion thermostat to con-trol outdoor-air damper and fan motor is recommended. This control is actuated when steam supply fails or condensate tem-perature drops below an established level, such as 120 to 150 F.

A vacuum breaker should also be used to equalize coil pressure with the atmosphere when steam supply throttles close. Steam should not be modulated when outdoor air is below 40 F.

On low-pressure and vacuum steam-heating systems, the thermostat may be replaced by a condensate drain with a ther-mal element. This element opens and drains the coil when con-densate temperature drops below 165 F. Note that condensate drains are limited to 5 psig pressure.

INNER DISTRIBUTING TUBE STEAM COILS — The inner distributing tube (IDT) steam coil used in the Carrier 39L air-handling units has an inner tube pierced to facilitate the dis-tribution of the steam along the tube’s length. The outer tubes are expanded into plate fins. The completed assembly includes the supply and condensate header and side casings which are built to slant the fin/tube bundle back toward the condensate header. The slanting of the assembly ensures that condensate will flow toward the drains. This condensate must be removed through the return piping to prevent premature failure of the coil. The fin/tube bundle is slanted vertically for horizontal air-flow coils, and horizontally for vertical air-flow coils.

IDT Steam Coil Piping — The following piping guidelines will contribute to efficient coil operation and long coil life:

1. Use full size coil outlets and return piping to the steam trap. Do not bush return outlet to the coil. Run full size to the trap, reduce at the trap.

2. Use float and thermostatic traps only for condensate re-moval. Trap size selection should be based on the differ-ence in pressure between the steam supply main and the condensate return main. It is good practice to select a trap with 3 times the condensate rating of the coil to which it is connected.

3. Use thermostatic traps for venting only.

4. Use only 1/2-in., 15-degree swing check valves installed horizontally, piped open to atmosphere, and located at least 12 in. above the condensate outlet. Do not use 45-degree, vertical lift and ring check valves.

5. The supply valve must be sized for the maximum antici-pated steam load.

6. Do not drip steam mains into coil sections. Drip them on the pressure side of the control valve and trap them into the return main beyond the trap for the coil.

7. Do not use a single trap for two or more coils installed in series. Where two or more coils are installed in a single bank, in parallel, the use of a single trap is permissible, but only if the load on each coil is equal. Where loads in the same coil bank vary, best practice is to use a separate trap for each coil.

Variation in load on different coils in the same bank may be caused by several factors. Two of the most common are uneven airflow distribution across the coil and stratifi-cation of inlet air across the coil.

8. Do not try to lift condensate above the coil return into an overhead main, or drain into a main under pressure with a modulating or on/off steam control valves. A pump and receiver should be installed between the coil conden-sate traps and overhead mains and return mains under pressure.

9. Use a strainer (3/32-in. mesh) on the steam supply side, as shown in the piping diagrams, to avoid collection of scale or other foreign matter in the inner tube distributing orifices.

NOTE: IDT coils must be installed with the tubes draining toward the header end of the coil. Carrier's IDT steam coils are pitched toward the header end as installed in the unit.

10. Ensure the AHU (air-handling unit) is installed level to maintain the inherent slope. Also ensure the unit is in-stalled high enough to allow the piping to be installed cor-rectly, especially the traps which require long drip legs.

11. Do not fail to provide all coils with the proper air vents to…