Carrier Air Conditioner 39LA User Manual

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

Indoor Air-Handling Units

Installation, Start-Up and

Service Instructions

CONTENTS

Page

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.

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,3

Unit Identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

PREINSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Suspended Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Service Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

External Vibration Isolators. . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-29

Mixing Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Inlet Guide Vane Actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Install Fan Motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Install Sheaves on Motor and Fan Shafts . . . . . . . . . . . . . .11

Install V-Belts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Water and Steam Piping Recommendations . . . . . . . . . . 14

Coil Freeze-Up Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Refrigerant Piping, Direct Expansion

(DX) Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Electric Heaters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Discharge Modification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29,30

Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30-38

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Fan Motor Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Coil Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Winter Shutdown (Chilled Water Coil Only) . . . . . . . . . . . 30

Field-Installed Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Coil Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Changing Coil Hand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Fan Shaft Bearing Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Fan and Shaft Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

METRIC CONVERSION CHART . . . . . . . . . . . . . . . . . . . . . . . 39

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.

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.



SAFETY CONSIDERATIONS

Air-handling equipment is designed to provide safe and

reliable 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.

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.

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.

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

Catalog No. 533-932 Printed in U.S.A. Form 39L-6SI Pg 1 1110 2-04 Replaces: 39L-5SI

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PREINSTALLATION

Suspended Units — Figure 6 shows overhead suspen-

sion 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.

1. Check items received against packing list. Notify Carrier

of any discrepancy.

2. Refer to Fig. 4 for service area requirements.

3. To transfer unit from truck to storage site, refer to rigging

details in Fig. 5 and section on unit rigging for proper

handling. See Table 1 for component weights.

Hardware required for installation of suspension channels is

shipped in a package inside the fan section.

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

Minimum recommended fork length is 48 inches.

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 suspension 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 in-

stallation. Replace screws in top panel.

2. Adjust channel to required length by sliding one channel

section 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 lift-

ing bracket.

4. Do not stack unit components or accessories during stor-

age. Stacking can cause damage or deformation.

5. If unit is to be stored for more than 2 weeks prior to in-

stallation, 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 station-

ary bearings can occur. Set unit off ground if in

heavy rain area.

b. Remove all fasteners and other small parts from

jobsite 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 protec-

tive shipping caps.

4. Install field-supplied suspension rods through ⁹/₁₆-in. di-

ameter holes provided at outer edges of channel. Be sure

hanger rods are securely fastened in place.

d. Monthly — Remove tarp from unit, enter fan

section through access door or through fan inlet,

and rotate fan and motor slowly by hand to redis-

tribute the bearing grease and to prevent bearing

corrosion.

Service Clearance — Provide adequate space for unit

service access (fan shaft and coil removal, filter removal, mo-

tor access, damper linkage access, etc.) as shown in Fig. 4.

Condensate Drain — To prevent excessive build-up of

condensate in drain pan, adequate trap clearance must be pro-

vided beneath the unit as indicated in Fig. 7. See Installation,

Condensate Drain section (page 8) for additional details.

Rigging (Fig. 5) — 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 place-

ment. 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.

External Vibration Isolators — Install vibration iso-

lators per certified drawings, and in accordance with the job

specifications and the instructions of the vibration isolator

manufacturer. The coil piping must be isolated or have a flexi-

ble connection to avoid coil header damage because of unit

motion. A flexible connection should be installed at the fan dis-

charge.

Do not remove protective cover or grease from fan shaft un-

til ready to install sheave.

Lay rigid temporary protection such as plywood walkways

in unit to prevent damage to insulation or bottom panel during

installation.

Figure 6 shows isolation location for floor mounting or

overhead suspension of unit.

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NOTE: Dimensions in ( ) are in mm.

DIMENSIONS (mm)

DIMENSIONS (ft-in.)

SIZE

39LA

500

600

700

900

1000

700

39LB 39LC

39LA

39LB 39LC

1- 7¹¹/₁₆0-7⁷/₈1-3³/₄2- 3⁹/₁₆

03 3-1⁷/₈

06 3-9³/₄

08 4-1¹¹/₁₆4-1⁹/₁₆2-5¹/₈

10 4-9⁹/₁₆4-9⁷/₁₆2-5¹/₈

12 5-5¹/₁₆5-5⁵/₁₆2-5¹/₈

15 5-5¹/₁₆5-5⁵/₁₆3-1

18 5-5¹/₁₆5-5⁵/₁₆3-4¹⁵/₁₆3- 3³/₈

21 6-5¹/₄

25 6-5¹/₄

3-1³/₄1-9¹/₄

3-9⁵/₈2-1³/₁₆1-11⁵/₈

952

1162

1262

1462

1653

1962

959

1159

1259

1459

1659

1959

540

640

740

200

400

700

900

0-7⁷/₈1-3³/₄2- 3⁹/₁₆

2- 3⁹/₁₆0-7⁷/₈1-3³/₄2- 3⁹/₁₆

2-11⁹/₁₆0-7⁷/₈1-3³/₄2- 3⁹/₁₆

940

0-7⁷/₈1-3³/₄2-11⁷/₁₆

6-5¹/₈4-0¹⁵/₁₆2- 3⁹/₁₆0-7⁷/₈1-3³/₄2-11⁷/₁₆

1040

1240

6-5¹/₈3-4¹⁵/₁₆3- 3³/₈

Fig. 4 — Service Area Requirements

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Table 1 — Physical Data

UNIT SIZE

UNIT WEIGHTS (lb)*

39LA

39LB

39LC

39LD

39LF

39LG

39LH

200

150

170

230

120

220

280

210

238

322

168

308

411

308

349

472

246

452

470

352

400

540

282

517

540

405

459

621

324

594

620

465

527

713

372

682

695

521

590

799

417

764

740

555

629

851

444

814

820

615

697

943

492

902

COMPONENT WEIGHTS (lb)

Mixing Box Section

Filter Mixing Box

Angle Filter Section

Flat Filter Section

139

150

164

173

193

208

219

227

107

226

245

114

244

279

134

283

327

140

272

340

159

311

395

185

Access Section

Preheat (Water) Section

Preheat (Electric) Section

TYPICAL DRY COIL WEIGHTS (lb)

Large Face Area Cooling Coils,

¹/₂-in. OD (Chilled Water & DX)†

4-Row

123

109

138

137

174

178

234

198

270

251

327

280

363

6-Row

Small Face Area Cooling Coils,

¹/₂-in. OD (Chilled Water & DX)†

4-Row

6-Row

8-Row

113

129

105

129

143

133

162

189

161

197

228

182

225

263

211

270

324

238

307

377

Hot Water Coils, /₂-in. OD†

1-Row

2-Row

104

117

130

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

6-FPI

9-FPI

12-FPI

100

115

130

110

125

145

135

155

180

150

175

205

180

214

248

215

256

297

FAN

Wheel Diameter (in.)

Wheel Width (in.)

Shaft Diameter (in.)

Maximum Fan Rpm

9 /₂

12 /₈

18 /₈

7 /₈

9 /₂

11 /₈

13 /₂

3/4

1 /₁₆

2500

2000

1600

1400

1300

1100

1000

OPERATING CHARGE, R-22 (lb)

4-Row Coil

1-2

2-3

2-4

3-5

3-4

5-6

4-5

5-6

5-7

4-5

6-8

7-9

5- 6

8-10

10-12

6- 7

9-11

12-14

6- 8

11-13

13-19

6- 9

11-16

16-24

6-Row Coil

8-Row Coil

COIL VOLUME (gal. water)

Chilled Water, /₂-in. OD Tube,

Large Face Area

4-Row

6-Row

2.5

3.2

3.5

4.7

4.5

6.0

5.2

6.8

5.6

7.7

7.3

10.1

8.5

11.7

10.4

14.2

12.0

16.3

Chilled Water, /₂-in. OD Tube,

Small Face Area

4-Row

2.1

2.4

2.7

3.3

3.7

4.1

3.9

5.1

6.4

4.1

5.9

7.4

5.1

6.6

8.4

6.3

8.3

10.7

7.3

9.5

12.1

8.7

11.8

14.7

9.8

13.5

17.2

6-Row

8-Row

Hot Water, /₂-in. OD Tube

1-Row

2-Row

0.5

0.7

0.8

1.3

1.0

1.6

1.3

2.0

1.5

2.4

1.8

2.9

2.1

3.4

2.5

4.0

2.9

4.8

COOLING COILS

Chilled Water /₂-in. OD Tube,

(4, 6 Row) Large Face Area

Face Area (sq ft)

3.63

26.1

5.90

34.0

7.90

37.9

9.54

45.8

11.18

53.7

14.91

53.7

17.71

53.7

21.6

65.5

25.0

65.5

Number of Tubes/Face

Finned Tube Length (in.)

Chilled Water /₂-in. OD Tube

(4, 6, 8 Row) Small Face Area

Face Area (sq ft)

2.72

26.1

4.72

34.0

6.58

37.9

7.95

45.8

9.32

53.7

12.12

53.7

13.98

53.7

17.1

65.5

20.5

65.5

Number of Tubes/Face

Finned Tube Length (in.)

DX /₂-in. OD Tube

(4, 6 Row) Large Face Area

Face Area (sq ft)

Finned Tube Length (in.)

3.63

26.1

5.90

34.0

7.90

37.9

9.54

45.8

11.18

53.7

14.91

53.7

17.71

53.7

21.6

65.5

25.0

65.5

DX /₂-in. OD Tube

(4, 6, 8 Row) Small Face Area

Face Area (sq ft)

Finned Tube Length (in.)

2.72

26.1

4.72

34.0

6.58

37.9

7.95

45.8

9.32

53.7

12.12

53.7

13.98

53.7

17.1

65.5

20.5

65.5

HEATING COILS

Hot Water /₂-in. OD Tube,

U-Bend (1, 2 Row)

Face Area (sq ft)

Number Tubes/Face

Finned Tube Length (in.)

2.72

26.1

4.72

34.0

6.58

37.9

7.95

45.8

9.32

53.7

12.12

53.7

13.98

53.7

17.1

65.5

20.5

65.5

Steam 1-in. OD (1 Row)

Face Area (sq ft)

Number Tubes/Face

Finned Tube Length (in.)

2.13

25.5

4.18

33.4

6.22

37.3

7.53

45.2

8.85

53.1

11.06

53.1

13.28

53.1

16.2

53.1

18.9

64.9

LEGEND

*Less coil.

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

—

Direct Expansion

FPI — Fins Per Inch

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DIFFERENTIAL

DRAIN NIPPLE

FAN OFF

DIFFERENTIAL

TRAP CONDITION WHEN FAN STARTS

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

bracket.

Fig. 5 — Unit Rigging Details

COOLING COIL

DRAIN PAN

FAN RUNNING AND CONDENSATE DRAINING

Fig. 7 — Condensate Drain

Fig. 6 — Unit Support Details

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INSTALLATION

Mixing Box

DAMPER ACTUATORS — The 39L mixing boxes are sup-

plied with low leak dampers and blade and edge seals. Damper

operating torques are shown in Table 2.

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. 8. For external mounting of

actuators, drill or punch a hole in the exterior panel.

NOTE: If the unit is shipped with AirManager™ controls,

actuator(s) are factory-supplied. Refer to Table. 3.

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. 9. See Fig. 10 for duct connection sizes.

Table 2 — Mixing Box Damper Operating Torque

(in.-lb)

39L UNIT SIZE

TORQUE

MXB — Mixing Box

NOTES:

1. Torque values are based on interconnected dampers driven by

one operator. For units with separate operators for each

damper, calculate torque as follows: Table values x .80 = torque

per damper section.

Fig. 9 — Mixing Box Ductwork Attachment

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

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. 7, 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 as required.

Fig. 8 — Typical Mixing Box Actuator Mounting

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Table 3 — Recommended Actuators

ROUND

SHAFT

SIZE

MIN-MAX

(in.)

DAMPER AREA

MAXIMUM

WIRE

LENGTH

(ft)

ACCESSORY

PACKAGE

NO.

(sq ft)

MAXIMUM

STROKE

(degrees)

ACTUATOR

PART NO.

VOLTAGE

(50/60 Hz)

TIMING

(sec)

TORQUE

(in.-lb)

Parallel Opposed

33AMACTDMP133

33AMACTGV-133

33AMACTGV-266

HF27BJ035*

HF27BJ033

HF27BJ034

10 .750-1.050

150

< 150

135

N/A

133

266

300

725

450

.375- .625

.475- .750

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

dampers.

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.

*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-

terminated to the actuator. Part No. HF27BB035 and 034 are

16 ft, HF27BB033 is 9.5 ft.

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 in ( ) are in millimeters.

DIMENSIONS (ft-in.)

UNIT

39L-

2- 3⁹/₁₆

2-11⁷/₁₆

3-1⁷/₈

3-9³/₄

4-1¹¹

4-9⁹/₁₆

5-5⁷/₁₆

6-5¹/₄

2-0¹/₄

2-4³/₁₆

2-8¹/₈

3-4

3-7¹⁵

4-3¹³

1- 5

1-5

1-9

2-3

2-5

0- 1⁵/₈

0- 4¹/₈

0- 6¹/₁₆

0- 8

0- 7

0- 6

0- 9⁷/₈

0-6¹/₁₆

0-4¹/₁₆

0-5

0-10¹/₂

0-11³/₈

0- 6³/₈

0- 8⁵/₁₆

0- 9¹/₄

1- 3¹/₈

0- 6⁵/₈

1-4³/₄

1-8¹¹

1-5¹/₄

2-1¹/₄

3-3¹/₄

3-7¹/₄

4-1¹/₄

5-6¹/₄

1- 5¹/₄

1- 7¹/₄

1-11¹/₄

2- 5¹/₄

2- 7¹/₄

1-11

3- 1

3- 5

3-11

5- 4

2-0⁵/₈

2-8¹/₂

3-0⁷/₁₆

3-8⁵/₁₆

0-4

6-5¹/₄

Fig. 10 — Mixing Box Duct Connections

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11. If a second actuator is required, repeat the process for a

second actuator. The second actuator mounts on the op-

posite side of the fan on the opposite end of the jackshaft.

ACTUATOR WIRING — To wire the actuator, perform the

following:

1. Each actuator is supplied with a length of plenum rated

cable. Route the cable from the actuator to the exterior of

the unit. Allow a sufficient service loop to provide free

movement of the fan sled.

Inlet Guide Vane (IGV) Actuators — The control

board positions the unit IGVs in order to maintain the duct stat-

ic pressure, as measured by the static pressure transducer, at the

required set point. The IGV actuator is electrically connected to

the control board and receives a signal whenever the guide

vane position needs to be adjusted. The guide vane actuator is

mounted to the IGV jackshaft, and secured to the jackshaft

mounting member in order to prevent rotation.

For factory-installed controls which are ordered with the

unit, the IGV actuator is properly sized and factory mounted to

the IGV jackshaft. The actuator wiring is routed across the fan

section to a junction box which is mounted to the exterior of

the unit. Two compatible actuators are available for field

installation. Both actuators are supplied with a length of

plenum rated cable to facilitate installation inside the unit. See

Table 3 for actuator specifications and typical applications.

Jackshaft and IGV linkage setup adjustments are extremely

important for proper IGV performance and static pressure con-

trol. Closely follow all instructions.

To install the IGV actuators, perform the following:

1. Disconnect power to the fan motor prior to performing

the installation.

2. At the desired location for field connection, drill a ³/₈-in.

hole (two holes within a /₈-in. diameter are required if

two actuators are used) through the unit and route the ca-

ble through the hole.

3. Install a field-supplied bushing to protect the cable and

seal the hole, using a suitable silicone sealer such as

Form-A-Gasket® by Permatex to secure the cable and

prevent air leakage.

4. Remove the center back plug from a field supplied 2 x

4-in. electrical junction box. Route the cable(s) through

the hole and secure the box to the unit using 2 field-

supplied no. 10 drill/tap screws.

5. Use a 3 or 4-conductor, 18 AWG cable or individual

18 AWG wiring using RED, WHITE, and BLACK color

coding to connect the actuator to the control box.

6. Inside the control box, connect all RED wire(s)

together. Secure with wire nuts or closed end crimp type

connectors.

2. Open the fan access door and locate the IGV jackshaft.

Measure the IGV jackshaft diameter. Verify that the size

is within the range of the actuator chosen. See Table 3.

3. Loosen the U-bolt locking nuts on the actuator.

4. Slip the actuator over the IGV jackshaft. Align the actua-

tor parallel with the frame member which supports the

jackshaft.

7. Inside the control box, connect all BLACK wire(s) to-

gether. Secure with wire nuts or closed end crimp type

connectors.

5. Take the anti-rotation bracket supplied with the actuator

and, with the center locking pin pointed outward, slip the

pin into the slot at the far end of the actuator. Seat the pin

into the center of the groove provided. If the anti-rotation

bracket is not seated against the frame member, measure

the distance from the member and remove the anti-

rotation bracket from the actuator. Bend the bracket to the

required offset. See Fig. 11.

6. With the anti-rotation bracket installed in the actuator

groove, locate the hole in the bracket, closest to the pin,

which is fully in contact against the frame. Mark this hole

location on the frame. Trace the outline of the bracket on

the frame so that it can be re-aligned again when

removed.

8. Inside the control box, connect all WHITE wire(s) to-

gether. Secure with wire nuts or closed end crimp type

connectors.

9. At the control box, strip /₄-in. of insulation from each

conductor. Equip each conductor with a /₄-in. female

spade type crimp connector.

10. Connect the RED wire to terminal T37 on the control

board.

11. Connect the WHITE wire to terminal T39 on the control

board.

12. Connect the BLACK wire to terminal no. 3 on the TB2

terminal block in the control box.

7. Remove the bracket and actuator. Drill a pilot hole at the

location marked from Step 6. Install one screw through

the hole. Re-align the bracket with the outline made pre-

viously and tighten the screw.

13. Check the rotation of the actuator. The switch is factory

set in the A position which provides clockwise rotation to

open the IGVs. If counterclockwise rotation is required to

open the IGVs, reset the actuator switch to the B position.

8. Locate and mark the hole on the opposite end of the

bracket, closest to the pin, which contacts the frame. Drill

a pilot hole in this location and install the remaining

screw. Remove the first screw.

9. Install the actuator on the jackshaft and while moving

into position, adjust the free end of the anti-rotation

bracket so that the pin fully locks into the slot provided in

the actuator. Once the actuator is adjusted into position,

install the remaining screw into the anti-rotation bracket.

See Fig. 12.

To adjust the jackshaft linkage, perform the following:

1. Refer to Fig. 12. Close the IGVs fully.

2. Loosen the crankarm and rods. Press the release button

on the actuator and rotate it to the .9 mark for right hand

units or the .1 mark for left hand units. Rotate the crank-

arm on the jackshaft to a position which is about 30 de-

grees from parallel alignment with the rod connecting the

IGV.

3. Tighten the crankarm into this position.

4. Close the IGVs fully by hand. Tighten the rod into

position.

10. Rotate the jackshaft to fully close the IGVs. Press the

release button (BLACK) on the face of the actuator, and

rotate the clamp in the same direction that closed the

IGVs, until the actuator stop is reached. With the release

still pressed, rotate the actuator clamp from the full closed

position to the .1 mark and release the actuator release

button. Lock the U-bolt clamp into position to secure the

actuator to the IGV jackshaft.

5. Test the actuator and IGV operation. Be sure the IGVs

fully close and open. Re-adjust the position of the swivel

joint outward if full IGV travel is not reached with the

actuator 90 degree rotation. If the IGVs reach the end of

full travel in less than 90 degrees of actuator rotation,

adjust the swivel joint inward toward the jackshaft. After

making any adjustment, repeat Steps 2-5.

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ANTIROTATION STRAP

INSTALLED (ACTUATOR

NOT SHOWN FOR

CLARITY)

JACKSHAFT

CRANKARM

Fig. 11 — IGV Actuator Bracket Installation

CONNECTING ROD

IGV ACTUATOR

ANTIROTATION

STRAP

IGV

JACKSHAFT

INLET GUIDE

VANES (IGV)

Fig. 12 — IGV Actuator Mounting

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 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. 13). 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 environ-

ment or indoors where the apparatus room is used as a fresh air

plenum, precautions must be taken to prevent condensation

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

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.

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When field installing or replacing sheaves, install sheaves

on fan shaft and motor shaft for minimum overhang. (See

Fig. 13.) 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.

3. Rotating each sheave a half revolution will determine

whether the sheave is wobbly or the drive shaft is bent.

Correct any misalignment.

4. With sheaves aligned, tighten cap screws evenly and

progressively.

NOTE: There should be a /₈-in. to /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 wob-

ble. Check by rotating sheaves and rechecking sheave

alignment. When substituting field-supplied sheaves for

factory-supplied 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

prefer-able for final speed adjustment.

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.

Install V-Belts — When installing or replacing belts, al-

ways use a complete set of new belts. Mixing old and new belts

will result in the premature wear or breakage of the newer

belts.

1. Always adjust the motor position so that V-belts can be

installed without stretching over grooves. Forcing belts

can result 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

recommended (Fig. 15).

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. 14.

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. 14. Adjustable pitch drives are installed

on the motor shaft.

With adjustable sheave, do not exceed maximum fan rpm.

Fig. 13 — Determining Sheave-Shaft Overhang

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DEFLECTION FORCE — LB

SMALL

SHEAVE

PD RANGE

(in.)

BELT

CROSS

SECTION

Super

Belts

Notch

Belts

SteelCable

Belts

Min Max Min Max Min Max

3.0- 3.6

3.8- 4.8

5.0- 7.0

3.4- 4.2

4.4- 5.6

5.8- 8.6

7.0- 9.4

9.6-16.0

2.65-3.65

4.12-6.90

4.40-6.70

7.1-10.9

11.8-16.0

12.5-17.0

18.0-22.4

3¹/₂

4¹/₄3⁷/₈5¹/₂

5¹/₂

5¹/₂5³/₄

4¹/₂6¹/₄3³/₄

6⁷/₈4¹/₄

4¹/₂

4³/₄

5¹/₄

5¹/₂

7¹/₄

8³/₄

5¹/₈7¹/₈6¹/₂9¹/₈5³/₄

6³/₈8³/₄7³/₈10¹/₈

11¹/₄14³/₈13³/₄17⁷/₈11¹/₄14

14¹/₈18¹/₂15¹/₄20¹/₄14¹/₄17³/₄

3¹/₂

4³/₄6⁷/₈5¹/₄7⁷/₈

10 15

10¹/₂15³/₄12⁷/₈18³/₄

3⁷/₈5¹/₂

—

Fig. 14 — Sheave Alignment

19¹/₂15

6. To determine correct belt tension, use the deflection

formula given below and the tension data from Fig. 15 as

follows:

40¹/₂

—

PD — Pitch Diameter, inches

EXAMPLE:

Given

Fig. 15 — Fan Belt Tension Data

Belt Span

Belt Cross-Section A, Super Belt

Small Sheave PD 5 in.

(Belt Span)

16 in.

NOTICE

TENSION BELTS TO SPECIFICATION

SHOWN ON DRIVE LABEL. OVER

TENSIONING BELTS WILL SEVERELY

REDUCE BELT AND BEARING LIFE.

Deflection =

Solution

1. From Fig. 15 find that deflection force for type A, super

belt with 5-in. small sheave PD is 4 to 5¹/₂lb.

REPLACEMENT PARTS

Deflection =

BEARINGS

DRIVE _______________________

3. Increase or decrease belt tension until force required for

¹/₄-in. deflection is 5¹/₂lb.

FREE ________________________

SHAFT ________________________

WHEEL ________________________

INLET CONE ____________________

Check belt tension at least twice during first operating

day. Readjust as required to maintain belt tension within

the recommended range.

With correct belt tension, belts may slip and squeal

momentarily on start up. This slippage is normal and disap-

pears after unit reaches operating speed. Excessive belt tension

shortens belt life and may cause bearing and shaft damage.

TO ORDER REPLACEMENT PARTS,

CONTACT: RCD

(REPLACEMENT COMPONENTS DIVISION)

1-800-443-4410

After run-in, set belt tension at lowest tension at which belts

will not slip during operation.

Record information on the label (Fig. 16) found on the door

of the fan section.

Fig. 16 — Fan Section Label

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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 supplied to the coil. It must not be installed in

any other position, and should not be used in the supply line.

Water and Steam Coil Piping Recommendations

GENERAL — Use straps around the coil casing or the lifting

holes (see Fig. 17) to lift and place the coil.

For coils used in tempering service, or to preheat outside air,

install an immersion thermostat in the condensate line ahead of

the trap. This will shut down the supply fan and close the out-

door damper whenever the condensate falls to a predetermined

point, perhaps 120 F.

To prevent damage to the coil or coil headers: Do not use

the headers to lift the coil. Support the piping and coil con-

nections independently. Do not use the coil connections to

support piping. When tightening coil connections, use a

backup wrench on the nozzles.

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 19 illustrates the typical piping at the end of every

steam supply main. Omitting this causes many field problems

and failed coils.

Figure 20 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.

Piping practices are outlined in the Carrier System Design

Manual, Part 3, Piping Design. See Tables 4-6 for circuiting data.

WATER COILS — Typically, coils are piped by connecting

the supply at the bottom and the return at the top. See Fig. 17.

This is not always the case, especially if the coil hand has been

changed in the field. Coils must be piped for counterflow; oth-

erwise, a capacity 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

bottom. The coil tubes must incline downwards toward

the return header connection for condensate drainage. See

Fig. 18-22.

Figure 21 shows a multiple coil arrangement applied to a

gravity return, including the open air relief to the atmosphere,

which DOES NOT replace the vacuum breakers.

Figure 22 illustrates the basic condensate lift piping.

Following the piping diagrams in Fig. 18-22, make all con-

nections while observing the following precautions:

Figure 18 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).

•

Install a drip line and trap on the pressure side of the

inlet control valve. Connect the drip line to the return

line downstream of the return line trap.

•

To prevent scale or foreign matter from entering the con-

trol valve and coil, install a /₃₂-in. mesh strainer in the

steam supply line upstream from the control valve.

Provide air vents for the coils to eliminate noncondens-

able gases.

Select a control valve according to the steam load, not

the coils supply connection size. Do not use an oversized

control 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

downstream trap.

To lift condensate above the coil return line into over-

head 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

according to the pressure difference between the steam

supply main and the return main.

•

Load variations can be caused by uneven inlet air distri-

bution or temperature stratification.

Drain condensate out of coils completely at the end of

the heating season to prevent the formation of acid.

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.

Fig. 17 — Coil Connections and Lifting Points

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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.

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.

For outdoor-air application where intermittent chilled water

coil operation is possible, one of the following steps should be

taken:

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.

•

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 30.

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

eliminate noncondensable gasses.

12. Do not support steam piping from the coil units. Both

mains and coil sections should be supported separately.

IDT Steam Coil Installation — Refer to drawings to position

the coils properly with regard to the location of the supply and

return connections. Ensure that the IDT coil is pitched with the

tubes draining toward the header. Carrier’s AHUs provide

proper coil pitch when the AHU is installed level.

Refer to schematic piping diagrams and piping connection

notes for the recommended piping methods.

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

39M air-handling units has an inner tube pierced to facilitate

the distribution 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 airflow 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 (F & T) traps only for conden-

sate removal. Trap size selection should be based on the

difference 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 /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.

NOTES:

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.

1. Flange or union is located to facilitate coil removal.

2. Flash trap may be used if pressure differential between steam

and condensate return exceeds 5 psi.

3. When a bypass with control is required.

4. Dirt leg may be replaced with a strainer. If so, tee on drop can

be replaced by a reducing ell.

5. The petcock is not necessary with a bucket trap or any trap

which has provision for passing air. The great majority of high

or medium pressure returns end in hot wells or deaerators

which vent the air.

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.

Fig. 18 — Low, Medium or

High Pressure Coil Piping

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NOTES:

1. A bypass is necessary around trap and valves when continu-

ous operation is necessary.

2. Bypass to be the same size as trap orifice but never less than

¹/₂inch.

Fig. 19 — Dripping Steam Supply to

Condensate Return

NOTES:

1. Flange or union is located to facilitate coil removal.

2. When control valve is omitted on multiple coils in parallel air

flow.

3. When a bypass with control is required.

4. Coils with different pressure drops require individual traps. This

is often caused by varying air velocities across the coil bank.

Fig. 21 — Multiple Coil Low Pressure

Piping Gravity Return

NOTES:

1. Flange or union is located to facilitate coil removal.

2. When a bypass with control is required.

3. Flash trap can be used if pressure differential between supply

and condensate return exceeds 5 psi.

4. Coils with different pressure drops require individual traps. This

is often caused by varying air velocities across the coil bank.

5. Dirt leg may be replaced with a strainer. If so, tee on drop can

be replaced by a reducing ell.

6. The petcock is not necessary with a bucket trap or any trap

which has provision for passing air. The great majority of high

pressure return mains terminate in hot wells or deaerators

which vent the air.

NOTES:

1. Flange or union is located to facilitate coil removal.

2. To prevent water hammer, drain coil before admitting steam.

3. Do not exceed one foot of lift between trap discharge and

return main for each pound of pressure differential.

4. Do not use this arrangement for units handling outside air.

Fig. 20 — Multiple Coil High Pressure Piping

Fig. 22 — Condensate Lift to Overhead Return

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Refrigerant Piping, Direct-Expansion (DX)

Coils (Fig. 23) — Direct-expansion coils are divided into

2 or 4 splits depending upon the unit size and coil circuiting.

See Table 7 for coil circuiting data. Each split requires its own

distributor nozzle, expansion valve, and suction piping. Suction

connections are on the air entering side when the coil is proper-

ly installed. Matching distributor connections for each coil split

are on the air leaving side. See unit label or certified drawing to

assure connection to matching suction and liquid connections.

See Table 8 for distributor part numbers.

Direct-expansion coils are shipped pressurized with dry

air. Release pressure from each coil split through valves in

protective caps before removing caps.

Do not leave piping open to the atmosphere unnecessar-

ily. Water and water vapor are detrimental to the refrigerant

system. Until the piping is complete, recap the system and

charge with nitrogen at the end of each workday. Clean all

piping connections before soldering joints.

The lower split of face split coils should be first on, last

off.

Fig. 23 — Typical Direct-Expansion

Row Split Coil

Row split coils utilize special intertwined circuits (as

shown in Fig. 23); either split of these row split coils can be

first on, last off.

Table 4 — Hot Water Coil Circuiting Data

39L UNIT SIZE

No. of Circuits

1-ROW

2-ROW

LEGEND

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

— Full Circuit

— Half Circuit

Table 5 — Chilled Water Coil Circuiting Data

LARGE FACE AREA (39LA, 39LD)

UNIT SIZE

Face Area (sq ft)

7.90

COIL

TYPE

CIRCUIT

3.63

5.90

9.54

11.18

No.

Circuits

Connection

No.

Circuits

Connection

No.

Circuits

Connection

Size

No.

Circuits

Connection

No.

Circuits

Connection

Size

1¹/₂

—

1¹/₂

—

1¹/₂

—

1¹/₂

—

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

4-ROW

6-ROW

—

LARGE FACE AREA (39LA, 39LD)

UNIT SIZE

21.60

COIL

TYPE

Face Area (sq ft)

17.71

CIRCUIT

14.91

25.00

No.

Circuits

Connection

Size

No.

Circuits

Connection

Size

No.

Circuits

Connection

No.

Circuits

Connection

Size

—

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

1¹/₂

2¹/₂

4-ROW

6-ROW

1¹/₂

2¹/₂

—

2¹/₂

LEGEND

NOTES:

1. Connection sizes are MPT — inches.

2. Sizes 21-25 have 2 coils.

— Double Circuit

— Full Circuit

— Half Circuit

— Quarter Circuit

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Table 5 — Chilled Water Coil Circuiting Data (cont)

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

UNIT SIZE

Face Area (sq ft)

6.58

COIL

TYPE

CIRCUITING

2.72

4.72

7.95

9.23

No.

Circuits

Connection

No.

Circuits

Connection

No.

Circuits

Connection

Size

No.

Circuits

Connection

No.

Circuits

Connection

Size

—

1¹/₂

—

1¹/₂

—

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

—

4-ROW

—

1¹/₂

—

1¹/₂

—

1¹/₂

2¹/₂

1¹/₂

2¹/₂

1¹/₂

2¹/₂

6-ROW

—

1¹/₂

—

1¹/₂

—

1¹/₂

2¹/₂

1¹/₂

2¹/₂

1¹/₂

2¹/₂

8-ROW*

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

UNIT SIZE

COIL

TYPE

Face Area (sq ft)

CIRCUITING

12.12

13.98

17.10

20.50

No.

Circuits

Connection

No.

Circuits

Connection

No.

Circuits

Connection

Size

No.

Circuits

Connection

Size

—

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

1¹/₂

2¹/₂

4-ROW

1¹/₂

2¹/₂

1¹/₂

2¹/₂

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

6-ROW

1¹/₂

2¹/₂

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

—

1¹/₂

2¹/₂

8-ROW*

LEGEND

— Double Circuit

— Full Circuit

— Half Circuit

Q — Quarter Circuit

*Not available on 39LB units.

NOTE: Connection sizes are MPT - inches.

Table 6 — Steam Coil Connection Sizes

39L UNIT SIZE

03-25

FACE AREA

COIL TYPE

CIRCUITING

CONNECTION

CONNECTION SIZE

Inlet

2¹/₂

Small

1-Row

Outlet

1¹/₂

LEGEND

— Full Circuit

NOTE: Connection sizes are MPT - inches.

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SUCTION PIPING — Connect suction piping as shown in

Fig. 24 for face split coil or Fig. 25 for row split coil.

Suction line from coil connection to end of the 15-diameter-

long riser should be same tube size as coil connection to ensure

proper refrigerant velocity.

Refer to Carrier System Design Manual, Part 3, and size re-

maining suction line to compressor for a pressure drop equiva-

lent to 2.0 F. This will provide a total suction line header pres-

sure drop equivalent to approximately 2.5 F. Refer to Fig. 26

for piping risers to the compressor.

To minimize the possibility of flooded starts and compres-

sor damage during prolonged light load operation, install an ac-

cumulator in the suction line or a solenoid in the liquid line of

last-on, first off split in row-split applications.

EXPANSION VALVE PIPING — Distributor nozzles sized

for acceptable performance for a range of conditions are facto-

ry supplied. Use the AHU (Air-Handling Unit) selection pro-

gram in the Carrier electronic catalog to select optimal nozzle

sizes. Replace factory nozzle as necessary for best perfor-

mance. See Fig. 27.

Thermostatic expansion valves are field supplied. See

Fig. 27.

NOTE: Be sure that correct nozzle is installed in each distribu-

tor before installing expansion valve. Before installing field-

supplied nozzles, remove nozzle retainer rings and factory-

installed minimum-sized nozzles from distributors.

TXV — Thermostatic Expansion Valve

Fig. 24 — Face Split Coil Suction Line Piping

Install expansion valve (Fig. 27) as follows:

1. Wrap wet cloths around valve body to prevent excessive

heat from reaching diaphragm and internal parts. Do not

allow water to enter system. Disassemble expansion

valve before soldering, if accessible, for easy reassembly.

Use 95-5 tin-antimony soft solder.

2. Solder expansion valve outlet directly to distributor un-

less:

a. An adapter bushing or coupling is supplied by the

factory (solder adapter to distributor first, then to

expansion valve).

b. Hot gas bypass is required. (See Hot Gas Bypass

section, below.)

3. Solder expansion valve equalizer line to suction line and

locate control bulb on suction line as in Fig. 24 or 25.

4. Insulate expansion valve body, diaphragm assembly and

control bulb area to prevent charge migration and exces-

sive condensation.

5. Install filter drier ahead of expansion valve to ensure sat-

isfactory valve operation.

TXV — Thermostatic Expansion Valve

Fig. 25 — Row Split Coil Suction Line Piping

HOT GAS BYPASS — When low-load operation requires

use of hot gas bypass, hot gas must be introduced between ex-

pansion valve and distributor. See Table 9.

Install hot gas bypass connector (Fig. 28) in coil split that is

first on, last off as follows:

1. Remove distributor nozzle and retainer ring (area A) from

distributor and reinstall in inlet (area B) of side connector.

2. Solder side connector outlet to distributor inlet, using

silver solder or equivalent with 1300 to 1500 F melt

temperature.

3. Silver-solder expansion valve outlet to side connector

inlet.

4. If required, install factory-supplied adapter bushing or

coupling to connector inlet before soldering to expansion

valve outlet.

Fig. 26 — Suction Line Riser Piping

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Table 7 — Direct Expansion Coil Circuiting Data

LARGE FACE AREA (39LA, 39LD)

UNIT SIZE

CIRCUITING TYPE

Half

Qtr

Full

Qtr

Full

Qtr

Full

Qtr

Full

Half

Full

CFM AT 550 FPM

FACE AREA (sq ft)

TUBE FACE

1996

3.63

3245

5.90

4345

7.90

5247

9.54

6149

11.18

TUBE LENGTH (in.)

26.1

34.0

37.9

45.8

53.7

NUMBER OF CIRCUITS

—

NUMBER OF TXVs

NUMBER OF CIRCUITS/TXV†

SUCTION CONNECTIONS

(in. OD)

DISTRIBUTOR CONNECTIONS

(in. OD)

1¹/₈

1³/₈

—

1¹/₈

—

1¹/₈

—

1¹/₈

—

1³/₈

—

1⁵/₈

—

1⁵/₈

1¹/₈

—

1¹/₈

—

1⁵/₈

—

1⁵/₈

1¹/₈

4-ROW COIL

Circuit Equivalent Length (ft)

Distributor Tube Length (in.)

Face Split

—

Row Split

Distributor Nozzle Size**

6-ROW COIL

Circuit Equivalent Length (ft)

Distributor Tube Length (in.)

Face Split

—

Row Split

Distributor Nozzle Size**

LARGE FACE AREA (39LA, 39LD)

18 21

Full

UNIT SIZE

CIRCUITING TYPE

Full

Half

Full

Half

Full

Half

Double

Half

Double

CFM AT 550 FPM

FACE AREA (sq ft)

TUBE FACE

8200

9740

17.71

11,880

21.6

13,750

25.0

22U-22L

65.5

14.91

TUBE LENGTH (in.)

53.7

65.5

NUMBER OF CIRCUITS

—

NUMBER OF TXVs

NUMBER OF CIRCUITS/TXV†

SUCTION CONNECTIONS

(in. OD)

DISTRIBUTOR CONNECTIONS

(in. OD)

1³/₈

9-10

1³/₈

9-10

1³/₈

9-10

1¹/₈

—

1⁵/₈

9-10

1³/₈

5-6

—

1¹/₈

1³/₈

1⁵/₈

1¹/₈

—

1³/₈

4-ROW COIL

Circuit Equivalent Length (ft)

Distributor Tube Length (in.)

Face Split

—

16³/₄

—

Row Split

Distributor Nozzle Size**

6-ROW COIL

Circuit Equivalent Length (ft)

Distributor Tube Length (in.)

Face Split

—

18¹/₂

—

Row Split

Distributor Nozzle Size**

LEGEND

**Factory-supplied distributors have factory-selected nozzle sizes

shown. If necessary, replace factory-supplied nozzles with field-

supplied and installed nozzles. Consult Electronic Catalog AHU

selection program for correct nozzle selection.

AHU — Air-Handling Unit Selection Program

TXV — Thermostatic Expansion Valve (Field-supplied)

††Not available on 39LB units.

*May be field manifolded for either face split or row split.

†Where each TXV has the same number of circuits, that number is

shown once. When coil has an uneven number of circuits per TXV,

both values are shown.

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Table 7 — Direct Expansion Coil Circuiting Data (cont)

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

UNIT SIZE

CIRCUITING TYPE

Half

Qtr

Full

Qtr

Full

Qtr

Full

Qtr

Full

Half

Full

CFM AT 550 FPM

FACE AREA (sq ft)

TUBE FACE

1496

2.72

2596

4.72

3619

6.58

4372

7.95

5126

9.32

TUBE LENGTH (in.)

26.1

34.0

37.9

45.8

53.7

NUMBER OF CIRCUITS

NUMBER OF TXVs

NUMBER OF CIRCUITS/TXV†

SUCTION CONNECTIONS

(in. OD)

DISTRIBUTOR CONNECTIONS

(in. OD)

1¹/₈

—

1¹/₈

—

1³/₈

—

1¹/₈

1³/₈

—

1¹/₈

1³/₈

1¹/₈

1³/₈

—

1¹/₈

—

4-ROW COIL

Circuit Equivalent Length (ft)

Distributor Tube Length (in.)

Face Split

—

Row Split

Distributor Nozzle Size**

1¹/₂

2¹/₂

6-ROW COIL

Circuit Equivalent Length (ft)

Distributor Tube Length (in.)

Face Split

—

11¹/₂11¹/₂

—

11¹/₂11¹/₂

—

11¹/₂

18¹/₂

—

11¹/₂

18¹/₂

11¹/₂

18¹/₂

Row Split

Distributor Nozzle Size**

11¹/₂

1¹/₂

2¹/₂

8-ROW COIL††

Circuit Equivalent Length (ft)

Distributor Tube Length (in.)

Face Split

—

11¹/₂

—

11¹/₂11¹/₂

—

11¹/₂

18¹/₂

—

11¹/₂

18¹/₂

11¹/₂

18¹/₂

Row Split

Distributor Nozzle Size**

1¹/₂

2¹/₂

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

UNIT SIZE

CIRCUITING TYPE

Half

Full

Half

Full

Half

Full

Half

Full

Double

CFM AT 550 FPM

FACE AREA (sq ft)

TUBE FACE

6666

12.12

7689

13.98

9405

17.1

11,275

20.5

TUBE LENGTH (in.)

53.7

65.5

NUMBER OF CIRCUITS

NUMBER OF TXVs

NUMBER OF CIRCUITS/TXV†

SUCTION CONNECTIONS

(in. OD)

DISTRIBUTOR CONNECTIONS

(in. OD)

1³/₈

6-7

7-8

1³/₈

1⁵/₈

⁷/₈-1¹/₈

1¹/₈

1³/₈

4-ROW COIL

Circuit Equivalent Length (ft)

Distributor Tube Length (in.)

Face Split

—

13/15

23¹/₂

—

Row Split

Distributor Nozzle Size**

6-ROW COIL

Circuit Equivalent Length (ft)

Distributor Tube Length (in.)

Face Split

—

23¹/₂

13/15

23¹/₂

—

16³/₄

—

Row Split

Distributor Nozzle Size**

8-ROW COIL

Circuit Equivalent Length (ft)

Distributor Tube Length (in.)

Face Split

—

23¹/₂

—

16³/₄

Row Split

Distributor Nozzle Size**

LEGEND

**Factory-supplied distributors have factory-selected nozzle sizes

shown. If necessary, replace factory-supplied nozzles with field-

supplied and installed nozzles. Consult Electronic Catalog AHU

selection program for correct nozzle selection.

AHU — Air-Handling Unit Selection Program

TXV — Thermostatic Expansion Valve (Field-supplied)

††Not available on 39LB units.

*May be field manifolded for either face split or row split.

†Where each TXV has the same number of circuits, that number is

shown once. When coil has an uneven number of circuits per TXV,

both values are shown.

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Table 8 — Distributor Part Numbers

SPORLAN

NO.

TUBES

PART NO.

Sporlan Carrier

CONNECTION

OD (in.)

NOZZLE

Type Size

1112-2-¹/₄EA07NC261

1112-3-¹/₄EA07FC027

1112-4-¹/₄EA07NC262

1112-5-¹/₄EA07NC263

1112-6-¹/₄EA07NC264

1113-7-¹/₄EA07HC207

1113-8-¹/₄EA07HC208

1115-8-¹/₄EA07KC240

1115-9-¹/₄EA07KC241

1115-10-¹/₄EA07KC242

1116-11-¹/₄EA07HC011

0.88

1.12

³/₄to 12

3 to 30

1117-11-¹/₄EA07LC510

1117-12-¹/₄EA07HC012

1117-13-¹/₄EA07HC013

1126-14-¹/₄EA07TC290

1126-15-¹/₄EA07HC015

1126-16-¹/₄EA07TC207

1126-17-¹/₄EA07HC017

1.38

3 to 50

Fig. 27 — Expansion Valve Piping

Fig. 28 — Distributor and Hot Gas Bypass

Auxiliary Side Connector

Table 9 — Side Connector (Hot Gas Bypass) Data

CONNECTION SIZES (in.)

SPORLAN

TYPE

CARRIER

PART NO.

USED WITH

NOZZLE

SIZE

DISTRIBUTOR TYPE

Inlet — ODM Solder

Outlet — ODF Solder

Auxiliary — ODF Solder

ASC-5-4

ASC-7-4

ASC-9-5

ASC-11-7 EA19BA905

ASC-13-9

—

1620, 1622

1112, 1113

1115, 1116

EA19BA504

EA19BA705

1¹/₈

1³/₈

1⁵/₈

1¹/₈

1³/₈

1⁵/₈

1117, 1126

—

1¹/₈

1125, 1127, 1143

DIMENSIONS (in.)

SPORLAN

TYPE

ASC-5-4

ASC-7-4

ASC-9-5

⁵/₈ODM

⁷/₈ODM

⁵/₈ODF 1.88 0.95 1.25

⁷/₈ODF 2.25 1.06 1.38

¹/₂ODM

1¹/₈ODM 1¹/₈ODF 2.81 1.47 1.62 1⁵/₈ODM

ASC-11-7 1³/₈ODM 1³/₈ODF 3.53 1.89 2.19 1⁷/₈ODM

ASC-13-9 1⁵/₈ODM 1⁵/₈ODF 3.72 1.83 2.75 1¹/₈ODM

LEGEND

ODF

ODM

—

Outside Diameter, Female

Outside Diameter, Male

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UNLOADING CONSIDERATIONS — Direct expansion coils

can have two intertwined refrigerant circuits. In addition, quar-

ter, half, full and double circuiting configurations are offered to

allow optimum system performance and oil return at full and

part-load operation.

Circuiting selection should result in a circuit loading of 0.8

to 2.0 tons per circuit at design load. Circuit loading must be

evaluated at minimum load to ensure that it does not drop

below 0.6 tons per circuit. Solenoid valves may be used, if nec-

essary, to shut off the refrigerant supply to individual expansion

valves to maintain adequate coil circuit loading.

There are three different options to control tons/circuit when

using an unloading compressor. The first is to use drop sole-

noid valve control as illustrated above and let the suction cutoff

unloaders “ride” with the load. The second is to use drop

solenoid valve control as illustrated above with electric unload-

ers and let the control algorithm determine the combination of

solenoid valves and unloaders to limit tons/circuit to acceptable

limits. The third is to limit the minimum amount of unloading

so that tons/circuit is within acceptable limits.

SPECIAL PIPING WITH 4 SPLITS PER COIL

Manifolding for 2-Face Splits — Refer to Fig. 29 and exter-

nally manifold as follows:

1. Connect the 4 expansion valves to the 4 distributors on

each coil and connect the 4 suction lines to the

15-diameter-long risers as outlined in previous piping

instructions.

Compressor minimum unloading and TXV quantity is nec-

essary to determine minimum tonnage per circuit.

Minimum Unloading Equation:

(Tons/Circuit) x (Minimum Unloading)

x (Total # of TXVs)

2. Install common liquid line for upper face split to first

(upper) and second expansion valves. Also, install a

common suction line from suction lines attached to first

(upper) and second suction header connections.

# of TXVs Active

Example:

Condensing Unit:

38ARS012

Minimum Unloading:33%

3. Repeat Step 2 for lower face split using third and fourth

distributor and suction connections.

Coil:

6 row, 11 FPI, Half Circuit

Coil Tons/Circuit:

Total TXVs:

In the first example we will determine the tons/circuit when

both TXVs are active and the compressor is unloaded to its

minimum of 33%.

1.68

Manifolding for 2-Row Splits — Refer to Fig. 30 and exter-

nally manifold as outlined for the 2-face splits with the

following exceptions:

1. Manifold in pairs, the first and third coil connections for

one split.

2. Manifold the second and fourth pairs of coil connections

for the other split.

NOTE: Split section using first and third pairs of coil connec-

tions should be first on, last off for coils with right hand (facing

direction of airflow) connections and the reverse for left hand

connections.

Hot Gas Bypass Connection with 4 Splits per Coil — For

either face or row splits connect a hot gas bypass auxiliary side

connector to each distributor of coil split that is first on, last off.

Refer to installation instructions for Hot Gas Bypass.

(1.68 Tons/Circuit) x (33% Minimum Unloading)

x (2 TXVs)

2 TXVs Active

(1.68) x (.33) x (2)

= .55 tons/circuit at minimum unloading UNACCEPTABLE

If we install a liquid line solenoid valve before one of the

TXVs and close it so that only one TXV is active when the

compressor is unloaded to its minimum of 33%, we see the

following:

(1.68 Tons/Circuit) x (33% Minimum Unloading)

x (2 TXVs)

1 TXV Active

(1.68) x (.33) x (2)

= 1.10 tons/circuit at minimum unloading ACCEPTABLE

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TXV — Thermostatic Expansion Valve

Fig. 29 — Face Split Coil Manifolding (Typical)

TXV — Thermostatic Expansion Valve

Fig. 30 — Row Split Coil Manifolding (Typical)

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Electric Heaters — Electric heaters may be factory in-

stalled or drop shipped to the jobsite and field installed. The

heater can only be installed in the preheat-electric section.

To install electric heater, refer to Fig. 31 and proceed as

follows:

1. Locate preheat-electric section already mounted on unit

and remove protective shipping cover.

2. Locate crate containing electric heater and verify heater

matches the unit. Unit hand and heater hands must agree.

3. Remove both knockout slugs (power and signal). Install

conduit connectors in top of coil connection box.

4. Remove top panel of the preheat-electric section and drill

or punch 2 holes are specified in Fig. 31.

5. Insert the electric heater into unit. It must slide between

2 angles located on the bottom of the section.

6. Secure heater to the preheat-electric section using

4 screws.

7. Locate top panel of section. Run conduit through top pan-

el and tighten conduit connectors. Lower top panel and

replace panel on unit.

8. Complete wiring per wiring diagram and job require-

ments. Follow all applicable local codes.

CONNECT POWER AND CONTROL WIRES — Heater wir-

ing schematic is located on control box panel. (Figure 32 shows

typical wiring details.) Electrical data for each standard heater

arrangement is shown in Table 10. Verify that minimum airflow

requirement (minimum coil face velocity, fpm) will be met,

especially on applications where variable air volume is supplied.

Use copper power supply wires rated for 75 C minimum.

On 250-v or greater applications, use 600-v rated wiring. Size

wires to carry 125% of current load on each set of terminals

(Table 11). Use the following formulas as required:

Single-phase line current

Fig. 31 — Electric Heater Installation

1 (kW per set of terminals) (1000)

voltage

Provide sufficient clearance for convection cooling of heat-

ers with solid-state controllers. Provide at least 5-in. of free air

space above and below cooling fins extending from heater ter-

minal box. Be sure to connect interlock terminals F1 and F2 to

auxiliary contacts on fan starter.

Three-phase line current

(kW per set of terminals) (1000)

(voltage) (1.73)

Each heater has 2 different types of factory-installed ther-

mal cutouts for overtemperature protection; an automatic reset

thermal cutout for primary protection and a manual reset ther-

mal cutout to protect against failure of the primary system.

Also provided is an airflow pressure differential switch to pre-

vent the heater from operating when the fan is not in operation

or airflow is restricted or insufficient. The primary automatic

reset cutout is a bi-metal disk-type cutout. It is wired into the

control circuit which operates the magnetic disconnecting con-

tactors (the same contactors which also switch on and off the

various steps of the coil). The secondary manual reset cutout is

a bi-metal disk-type cut-out. This secondary thermal cutout is

load carrying and is installed in each heater subcircuit. The pri-

mary and secondary overtemperature protection systems are

independent of each other. The secondary system is designed to

protect against possible failure of the primary system to deen-

ergize the heater.

(kW per set of terminals) (1000) = (voltage) (1.73)

Note that if the heater is rated at 50 kW (or more) and is con-

trolled by a cycling device such as a multi-stage thermostat, or

a step controller, conductors may be sized at 100% of load

amperes (as in Tables 10 and 11) per National Electrical Code

(NEC) Section 424-22. Heater construction and application

information (Tables 10 and 11) are based upon Underwriters’

Laboratories (UL) Space Heating Standard No. 1096 and the

requirements of the NEC. Installer is responsible for observing

local code requirements.

Install a disconnect switch or main circuit breaker in accor-

dance with NEC and other applicable codes. Locate so that it is

easily accessible and within sight of heater control box (per

NEC Article 424-19 and 424-65).

Weatherproof junction boxes have no knockouts for wire

entrance. Drill or punch holes for conduit as required and make

all junctions watertight.

Where field-supplied thermostats are used, isolate circuits

to prevent possible interconnection of control circuit wiring.

Subcircuits in the heaters are designed in compliance with

paragraph 424-22 of the NEC. The coil is subdivided into cir-

cuits that draw no more than 48 amps each and is fused for at

least 125% of the circuit rating.

Pitot tube is to be positioned so that the airflow switch is ac-

tuated by a minimum negative pressure of 0.07 in. wg.

Where field-supplied step controller is used, connect steps

to terminals as marked on wiring schematic. When connecting

multi-stage heaters, wire stage no. 1 so that it is first stage on,

last stage off. Connect thermostats as required.

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NOTE: All wiring must be copper and must conform to the NEC (National Electrical Code).

Fig. 32 — Typical Electric Heater Wiring Schematic

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Table 10 — Electric Heater Data

208/3/60 VOLTS

240/3/60 VOLTS

480/3/60 VOLTS

380/3/50 VOLTS

NOMINAL

COIL FACE

VELOCITY

(fpm)

UNIT HEATER

NO. OF

CONTROL

STEPS*

HEATER

COIL

TEMP

RISE

(F)

No.

MCA† Sub- MOCP

Ckt

No.

MCA† Sub- MOCP

Ckt

No.

MCA† Sub- MOCP

Ckt

No.

MCA† Sub- MOCP

Ckt

SIZE

39L

AREA

(sq ft)

Total

FLA

Total

FLA

Total

FLA

Total

FLA

17.2

19.9

29.8

39.9

43.2

500

3††

—

100

110

150

108

105

120

130

154

—

110

125

150

175

104

113

111

140

116

132

175

108

1**

100

110

100

150

125

150

125

150

175

110

131

119

143

121

140

—

114

137

124

164

148

179

152

175

—

2**

3††

—

100

125

100

150

2.2

3.7

104

125

100

122

139

150

177

125

150

175

200

5.1

6.2

7.3

111

120

142

104

123

114

125

—

39.9

47.3

51.8

59.8

19.9

29.8

39.9

51.8

19.9

29.8

39.9

51.8

19.9

25.8

111

131

144

—

111

119

144

—

111

125

144

—

125

144

—

139

164

180

—

150

175

200

—

120

142

156

—

120

129

156

—

120

135

156

—

125

150

175

—

125

150

175

—

125

150

175

—

104

139

149

180

—

110

150

200

—

104

125

—

104

139

156

180

—

122

156

180

—

110

150

175

200

—

125

175

200

—

10.0

108

125

—

108

125

—

108

125

—

100

125

175

—

129

105

135

156

—

110

150

175

—

11.74

51.8

100

150

200

117

141

120

138

175

120

145

166

218

—

125

144

—

19.9

25.8

122

156

180

—

104

139

174

226

277

335

—

125

175

200

—

110

150

175

250

300

350

—

105

135

156

—

110

150

175

—

100

125

175

200

250

300

350

—

14.21

51.8

79.8

116

39.9

79.8

96.5

110

145

100

175

—

100

125

175

200

225

300

121

147

167

221

111

139

181

222

268

—

120

151

196

240

291

331

—

120

157

192

232

265

—

100

125

150

175

225

124

152

183

209

276

17.79

—

4***

5†††

—

4***

LEGEND

NOTES:

1. Subcircuits are internal heater circuits of 48 amps or less.

ARI

—

Air Conditioning and Refrigeration Institute

American Wire Gage

2. Electric heat performance is not within the scope of ARI standard 430 certification.

3. To avoid damage due to overheating, minimum face velocity cannot fall below

350 fpm.

AWG

FLA

Full Load Amps

Kilowatts

MCA

MOCP

Minimum Circuit Amps

Maximum Overcurrent Protection

*Standard control steps are listed under the Control Step heading. “Free” additional

steps of control are optionally available when the number of subcircuits exceeds the

standard number of control steps.

†MCA = 1.25 x FLA; for proper wire sizing, refer to Table 310-16 of the NEC.

**2 control steps in this voltage.

††3 control steps in this voltage.

***4 control steps in this voltage.

†††5 control steps in this voltage.

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Table 11 — Field Wiring for Incoming Conductors

Sized for 125% of Heater Load

1. Sizes 03-18 without inlet guide vanes (IGVs) — See

Fig. 33. It is not necessary to remove the bearing support

channels from the fan housing.

LOAD AMPS*

Copper

LOAD AMPS*

Copper

WIRE SIZE

(AWG or kcmil)

WIRE SIZE

(AWG or kcmil)

Sizes 21 and 25 without IGV and 06-25 with IGVs —

See Fig. 34. The “A” frame support must be removed. To

change from upblast to horizontal discharge or from

horizontal to upblast discharge, the bearings must be

relocated to keep the wheel centered in the housing. To

change from upblast front (UBF) to upblast rear (UBR)

or from top horizontal front (THF) to top horizontal rear

(THR) or vice versa, turn the entire fan housing 180 de-

grees about its base.

1/0

2/0

120

140

160

184

204

228

248

268

304

3/0

4/0

250

300

350

400

500

104

2. Inlet guide vane actuators and linkages, where provided,

may be moved to the opposite fan scroll side sheet.

LEGEND

AWG — American Wire Gage

kcmil — Thousand Circular Mils

NOTE: The swivel joint must be at the 12 o’clock posi-

tion on the IGV assembly. (See Fig. 12.) The jackshaft

crankarm, attached to the jackshaft at the “A” frame, will

sit vertically up on all units. Figure 12 illustrates a jack-

shaft crankarm in the vertical up position.

*Values are based on Table 310-16 of the NEC (National Electrical

Code) for 75 C insulated copper wire. Not more than 3 conductors

in a raceway.

NOTES:

1. Be sure to consider length of wiring run and possible voltage

drops when sizing wires.

3. The fan shaft may be driven out and reinstalled to place

the drive pulley on the opposite end.

4. The fan scroll is prepunched for horizontal or vertical dis-

charge to match the support angles at the base of the unit.

5. The motor and motor base may be rotated to place the

motor at the front or rear of the unit. Proper location is

that which results in the longest drive center line distance.

The motor conduit box location may need to be reversed.

2. Field power wiring — Heaters are furnished with a terminal

block sized for incoming copper conductors with 75 C insulation

rated to carry at least 125% of the heater load. However, con-

ductors can be sized to carry 100% of the heater load if the

heater is rated at 50 kW or more, and the heater is controlled by

a cycling device such as a multi-stage thermostat, step control-

ler, or SCR (silicon control rectifier) power controller. Terminal

blocks and knockouts are sized to handle either 100% or 125%

conductors.

6. When hand of fan is changed, it may be necessary to turn

the discharge panel inside-out to fit correctly with the fan

discharge. In this case, remove the existing insulation and

install new duct-liner type insulation on the opposite side

of the discharge panel.

Discharge Modification — If field modification of

discharge position is required, 39L fans can be converted (by a

skilled mechanic) to any standard hand and discharge without

any additional parts. (NOTE: This does not apply to a model

change conversion.) All mounting holes are prepunched.

7. Rebalancing of the unit is recommended.

To convert a 39L fan, note the following:

LEGEND

THF — Top Horizontal Front

THR — Top Horizontal Rear

UBF — Upblast Front

UBR — Upblast Rear

Fig. 33 — Fan Discharge Positions, Fans without IGVs

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LEGEND

THF — Top Horizontal Front

THR — Top Horizontal Rear

UBF — Upblast Front

UBR — Upblast Rear

Fig. 34 — Fan Discharge Positions, Fans with IGVs

START-UP

Check List — Make a walkway inside unit components to

protect insulation. Remove all construction debris from unit

interior. Remove walkway before starting unit.

FILTERS — Install unit filters in all filter sections.

FANS

1. Check lubrication of fan, motor bearings, and linkages.

a. Note that bearings are shipped completely full of

grease for corrosion protection and may run warm

temporarily on start-up until excess grease has

discharged.

b. Hand-operate all linkages, such as damper and

guide vanes, to check for freedom of movement.

2. Check tightness of bearing setscrews or locking collars

(Fig. 35). Also, check tightness of setscrews on fan

wheels and sheaves.

3. Check tightness of fan shaft bearing mounting.

4. Recheck sheave alignment and belt tension. (Refer to

Fig. 14 and 15.)

SQUEEZE-TYPE LOCKING COLLAR

BEARING SETSCREW TORQUE (in.-lb)

39L UNIT SIZE

03,06,08,10,12

15,18,21,25

TORQUE

5. Hand turn fan to make certain fan wheel does not rub in

housing.

BEARING HOLDDOWN BOLT TORGQUE (ft-lb)

BOLT SIZE

³/₈-16

TORQUE

¹/₂-13

⁵/₈-11

100

Fig. 35 — Fan Shaft Bearing Details

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6. Check fan speed with a strobe-type tachometer or use the

following formula: Obtain the motor rpm from the fan

motor nameplate and read sheave pitch diameters marked

on the fan and motor pulleys, or estimate the pitch diame-

ters by using the pulley outside diameters.

DX Coil — Charge refrigerant. Also refer to condensing unit

service and installation instructions. Refrigerant operating

charge for unit coil is shown in Table 1.

SERVICE

General

Then:

Motor Rpm x Motor Sheave

1. Place a suitable walkway to protect floor insulation

Pitch Diameter (in.)

Fan Rpm =

whenever entering the fan section.

Fan Sheave Pitch Diameter (in.)

2. Review Safety Considerations at beginning of these in-

structions. Good safety habits are important tools when

performing service procedures.

3. To make speed measurements, use a strobe-style tachom-

eter or calculate per Step 6 of Start-Up, Check List.

Example:

Actual

1760

Approximate

1760

Nameplate Motor

Rpm

Mtr Sheave Pitch

Diameter

Fan Motor Replacement

1. Shut off motor power.

2. Disconnect and tag power wires at motor terminals.

3. Loosen motor brace-to-mounting-rail attaching bolts.

Loosen belt tensioning bolts to adjust the motor position

so V-belts can be removed without stretching over

grooves.

8.9 in.

9.0 (OD)

Fan Sheave Pitch

Diameter

Fan Rpm

12.4 in.

1760 x 8.9

12.4

12.5 (OD)

1760 x 9

12.5

1263 Rpm

1267 Rpm

Refer to Table 1, Physical Data for maximum allowable

fan speeds for standard wheels. Excessive fan speed may

result in condensate carryover from cooling coil or fan

motor overload and wheel failure.

4. Mark belt as to position. Remove and set aside belts.

5. Remove motor to motor bracket holddown bolts.

6. Remove motor pulley and set aside.

7. Remove motor.

8. Install new motor. Reassemble by reversing Steps 1-6. Be

sure to reinstall multiple belts in their original position.

Use a complete new set if required. Do not stretch belts

over sheaves. Review the sections on motor and sheave

installation, sheave alignment and belt tensioning dis-

cussed previously (Fig. 13-15).

7. Check direction of rotation (see Fig. 36). Arrow on drive

side of fan housing indicates correct direction of rotation.

9. Reconnect motor leads and restore power. Check fan for

proper rotation as described in Start-Up, Check List.

Coil Cleaning

DETERGENT — Spray mild detergent solution on coils with

garden-type sprayer. Rinse with fresh water. Check to ensure

condensate line is free. Excess water from cleaning may flood

unit if condensate line is plugged.

STEAM — Remove coil to facilitate cleaning and prevent

damage to unit insulation. See Coil Removal section which

follows.

Fig. 36 — Fan Wheel Rotation

8. Check vibration. If excessive vibration occurs, check for

the following:

Winter Shutdown (Chilled Water Coil Only) — It

is recommended that auxiliary drain piping be added to coil

piping if yearly winterizing of coils is anticipated. This auxilia-

ry piping should be located at the highest and lowest point on

the respective header connection for each coil.

a. Variable sheave (if air balance of system has been

accomplished: replace sheave with fixed sheave

for continuous application).

ANTIFREEZE METHODS OF COIL PROTECTION

1. Close coil water supply and return valves.

2. Drain coil as follows:

b. Drive misalignment.

c. Mismatched, worn or loose belts.

d. Wheel or sheaves loose on shaft.

e. Loose bearings.

f. Loose mounting bolts.

g. Motor out of balance.

h. Sheaves eccentric or out of balance.

i. Vibration isolators improperly adjusted.

j. Out-of-balance or corroded wheel (rebalance or

replace if necessary).

k. Accumulation of material on wheel (remove

excess material).

Method I — ‘Break’ flange of coupling at each header

location. Separate flange or coupling connection to facili-

tate coil draining.

Method II — Open both valves to auxiliary drain piping.

3. After coil is drained, Method I, connect line with a service

valve and union from upper nozzle to an antifreeze reser-

voir. Connect a self-priming reversible pump between the

low header connection and the reservoir. Method II, make

connection to auxiliary drain valves.

4. Fill reservoir with any inhibited antifreeze acceptable to

code and underwriter authority.

COILS

5. Open service valve and circulate solution for 15 minutes;

then check its strength.

Chilled Water Coil — Typical coil vents, drains, and lifting

points are shown in Fig. 17.

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6. If solution is too weak, add more antifreeze until desired

strength is reached, then circulate solution through coil

for 15 minutes or until concentration is satisfactory.

7. Remove upper line from reservoir to reversible pump.

Drain coil to reservoir and then close service valve.

8. Break union and remove reservoir and its lines.

9. Leave coil flanges or coupling open and auxiliary drain

valves open until spring.

install the coil with the downstream bottom of the coil attached

to the upright mounting flange as shown in Fig. 36. Adjust

the coil and then attach the top coil baffle to the top flange

provided.

Coil Removal

HORIZONTAL UNIT SLANT COIL REMOVAL (39LA

Units)

NOTE: Item numbers are in Fig. 38.

AIR DRYING METHOD OF COIL PROTECTION (Unit

and coil must be level for this method.)

1. Close coil water supply and return main valves.

1. Refer to Fig. 4 for service area clearance.

2. Disconnect piping (Item 5).

3. On top panel (Item 3), remove screws located directly

above side panels (Items 2 and 6). Top panels may be re-

moved from unit to provide more workspace, but it is not

required.

2. Drain coil as described in procedures for Antifreeze

Methods of Coil Protection.

3. Connect air supply or air blower to inlet header connec-

tion and close its drain connection.

4. Circulate air and check for air dryness by holding mirror

in front of open vent in outlet header drain connection.

Mirror will fog if water is still present.

5. Allow coil to stand for a few minutes; repeat step 4 until

coil is dry.

4. Remove right side panels (Item 6).

5. If accessory is present, remove accessory side panel

(Item 1) on left side of unit. Detach filter track support

bracket if upstream accessory is a filter.

6. Remove screws from inside baffle (Item 13). Leave baffle

attached to left side panel (Item 2).

Field-Installed Coils (39LA,LD Only)

7. Remove left side panel (Item 2).

When a 39LA or 39LD unit is ordered without the coil, the fol-

lowing loose parts are shipped: (see Fig. 37)

• bottom coil baffle

8. Remove condensate baffle (Item 8).

9. Remove coil holddown screws (Items 9 and 11).

10. Remove baffle screws (Item 4) from downstream side of

coil.

11. Tilt coil (Item 10) away from coil support panels (Items 7

and 12) and slowly slide coil out of unit.

12. Replace coil by reversing preceding Steps 1-11.

• side hairpin baffle

• side header baffle

• top coil baffle

These parts should be field-installed onto the coil before

placing the coil into the unit. Once the baffles are installed,

SIDE HAIRPIN

BAFFLE

TOP COIL

BAFFLE

SIDE HEADER

BAFLE

SEE TOP

FLANGE DETAIL

BOTTOM

MOUNTING

FLANGE

BOTTOM COIL

BAFFLE

TOP FLANGE DETAIL

Fig. 37 — Field-Installed Coils (39LA and LD only)

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LEGEND

—

Accessory Side Panel

Left Side Panel

Top Panels

—

Condensate Baffle

Holddown Screws

Coil

Baffle Screws

Holddown Screws

Left Support Panel

Inside Baffle

Piping

Right Side Panels

Right Support Panel

Fig. 38 — Horizontal Unit Slant Coil Removal (39LA Units — Sizes 03-21)

VERTICAL UNIT SLANT COIL REMOVAL (39LD

6. Remove screws from inside baffle (item 14). Leave baffle

attached to left side panel (Item 16).

7. Remove left side panel (Item 16).

NOTE: Support of fan section may be required after re-

moval of side panels (Items 7 and 16).

8. Remove condensate baffle (Item 9).

9. Remove coil holddown screws (Items 10 and 12).

10. Remove baffle screws (Item 5) from downstream side of

coil.

11. Tilt coil (Item 11) away from coil support panels (Items 8

and 13).

12. Replace coil by reversing preceding Steps 1 - 11.

Units)

NOTE: Item numbers are in Fig. 39.

1. Refer to Fig. 4 for service area clearance.

2. Disconnect piping (Item 6).

3. Through fan access door (Item 2), remove screws

(Item 3), while holding angle (Item 4) to top of coil side

panels (Item 7). On opposite end of unit, gain access to

similar screws by removing side panels (Item 1).

4. Remove right side panels (Item 7).

NOTE: Support of fan section may be required after re-

moval of side panels (Items 7 and 16).

5. If accessory is present, remove accessory side panel

(Item 15) on left side of unit. Detach filter track support

bracket if upstream accessory is a filter.

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LEGEND

—

Fan Side Panel

Fan Access Door

Screws

—

Holddown Screws

Coil

Holddown Screws

Left Support Panel

Inside Baffle

Accessory Side Panel

Left Side Panels

Rear Panel

Angle

Baffle Screws

Piping

Right Side Panels

Right Support Panel

Condensate Baffle

Fig. 39 — Vertical Unit Slant Coil Removal (39LD Units — Sizes 03-21)

HORIZONTAL OR VERTICAL UNIT — DUAL COIL

REMOVAL (39LA,39LD units — size 25) — (NOTE: Item

numbers are in Fig. 40 unless otherwise indicated.)

1. Refer to Fig. 4 for service area requirements.

2. Disconnect piping (Item 5).

3. Horizontal Unit, 39LA — On top panel (Item 3) remove

screws located directly above side panels (Items 2 and 6).

Top panels may be removed from unit to provide more

workspace, but it is not required.

NOTE: Vertical units may require support of fan section

after removal of side panels.

5. If accessory is present, remove accessory side panel (Item

1) on left side of unit. Detach filter track support bracket

if upstream accessory is a filter.

6. Remove screws from horizontal baffle (Item 8). Leave

baffle attached to upper condensate pan (Item 9).

7. Remove screws from inside baffles (Item 7). Leave

baffles attached to left side panel (Item 2).

Vertical Unit, 39LD — Through fan access door (Item 2,

Fig. 39), remove screws (Item 3, Fig. 39) holding angle

(Item 4, Fig. 39) to top of coil panels (Item 7, Fig. 39).

8. Slide coils and header and baffles from unit.

9. Replace coils by reversing proceeding Steps 1-8.

Remove rear panel (Item 17, Fig. 39) and remove baffle

angle screws (Item 4) holding top baffle to coil.

4. Remove side panel(s) (Item 6).

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LEGEND

—

Accessory Side Panel

Left Side Panel

Top Panels

Baffle Angle Screws

Piping

—

Right Side Panels

Inside Baffle

Horizontal Baffle

Upper Condensate Pan

Baffle Screw

Fig. 40 — Horizontal or Vertical Unit — Dual Coil Removal (39LA,LD Units, Sizes 25)

HORIZONTAL OR VERTICAL UNIT — VERTICAL COIL

REMOVAL (39LB,LC,LF,LH Units) — Item numbers are in

Fig. 41 unless otherwise indicated.

Remove rear panel (Item 17, Fig. 39) and remove baffle

angle screws (Item 5) holding top baffle to coil.

4. Remove side panel(s) (Item 7).

1. Refer to Fig. 4 for service area requirements.

2. Disconnect piping (Item 6).

NOTE: Vertical units may require support of fan section

after removal of side panels.

3. Horizontal Unit, 39LB and 39LC — On top panel

(Item 4) remove screws located directly above side panels

(Items 2 and 7). Top panels may be removed from unit to

provide more workspace, but it is not required.

5. If accessory is present, remove accessory side panel

(Item 1) on left side of unit. Detach filter track support

bracket if upstream accessory is a filter.

6. Remove screws (Item 8) from inside baffle (Item 3).

Leave baffle attached to left side panel (Item 2).

7. Slide coil and header end baffle from unit.

8. Replace coil by reversing preceding Steps 1-7.

Vertical Unit, 39LF and 39LH — Through fan access

door (Item 2, Fig. 39), remove screws (Item 3, Fig. 39)

holding angle (Item 4, Fig. 39) to top of coil panels

(Item 7, Fig. 39).

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LEGEND

—

Accessory Side Panel

Left Side Panel

Inside Baffles

—

Baffle Angle Screw

Piping

Right Side Panel

Baffle Screw

Top Panels

Fig. 41 — Horizontal or Vertical Unit — Vertical Coil Removal (39LB,LC,LF,LH Units)

Changing Coil Hand

NOTE: Electric heat coil hand cannot be changed.

result is often experienced if after-market fin coatings are

applied.

If a NuFin hydronic coil is installed with correct airflow, but

opposite piping hand, and counterflow is maintained, steps

must be taken to ensure that the coil is continuously vented,

and that the water velocity is maintained to prevent the coil

from air-binding.

Hot or cold areas of the coil face (or otherwise broad tem-

perature differences and stratification) are usually indications

that one or more circuits are air-locked internally. This can

result in coil freeze-up (a condition NOT covered by warranty).

Refrigerant coils may be rotated for opposite hand applica-

tions, maintaining the proper airflow direction.

Do not reposition the distributor(s), they will perform equal-

ly well in upflow or downflow positions. When soldering

expansion valves to up-feed distributors, use the minimum

satisfactory amount of solder to prevent damaging the valve or

plugging passages.

DIRECT EXPANSION COILS — Rotate the coil in vertical

plane and reinstall. Distributor must be on downstream side of

coil. (Refer to Fig. 42).

CHILLED WATER AND HOT WATER COILS — These coils

can be rotated. If coil is rotated in vertical plane and reinstalled

with counterflow maintained, supply will be at the top of the coil

and return will be at the bottom. Ensure coil is continuously

vented and water velocity is maintained to prevent air binding.

NOTE: The coil cover panel is not part of the coil. Remove

cover panel from end of unit. New holes must be cut in coil

cover panel. Original holes must be plugged and insulated.

New side panels may be necessary when changing coil hand.

NU-FIN COILS — The NuFin coil is airflow direction sensi-

tive, especially when used in dehumidifying applications.

Hydronic versions are counterflow circuited for full gravity

draining when installed level.

Correct installation will result in the typical bottom inlet on

leaving air face and top outlet on entering air face of coil, a

self-venting design. This will ensure cold air contact with cold

water, and warm air with hot water.

Coil repositioning for opposite hand application will com-

promise one or more of these characteristics. However, there

will be those situations where this may prove acceptable.

As a general rule, a change from counterflow circuiting to

parallel flow for sensible heating and cooling applications will

result in a 5% drop in net capacity per row of coil. In one and

two row heating coils, the actual drop may not be measurable,

thus of insignificant consequence.

It is important that the airflow direction of the NuFin coil be

adhered to when latent cooling is possible. Significant moisture

carryover from the face of the dehumidifying coil will result if

this rule is violated, even at very low face velocities. The same

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2. Use a vacuum breaker in the return.

3. Do not use overhead returns from the coil. A floodback

can occur.

4. An immersion thermostat to control outdoor-air dampers

and the fan motor is recommended. This control is acti-

vated when the steam supply fails or the condensate

temperature drops below a predetermined temperature,

usually 120 F.

Chilled and hot water coils must not be rotated horizon-

tally. If coils are rotated horizontally, severe water blow-off

will result.

STEAM INNER DISTRIBUTING TUBE COILS — Rotate

in horizontal plane and reinstall. See Fig. 42.

PIPING — Direct expansion, chilled water, and hot water

coils should always be piped for counterflow. (Fluid should

enter the coil at the leaving-air side.) Steam coils must have the

condensate connection at bottom of coil.

To determine intervals for cleaning coils in contaminated air

operations, pressure taps should be installed across the coils

and checked periodically. Abnormal air pressure drop will indi-

cate a need for cleaning the coils.

Annual maintenance should include:

1. Clean the line strainers.

2. Blow down the dirt leg.

5. On low pressure and vacuum systems, the immersion

thermostat may be replaced by a condensate drain with a

thermal element. This element opens and drains the coil

when the condensate temperature drops below 165 F.

Note the thermal condensate drain is limited to 5 psig

pressure. At greater coil pressures they will not open.

In spite of the precautions listed above, a coil may still

freeze up. An oversize capacity coil, at partial load, with a

modulating steam control valve will occasionally freeze.

Freezing occurs in the 20 F to 35 F range of entering-air

temperatures. A better installation would be an undersize coil,

with an on/off control valve with thermostatic control in the

outside air, set at 35 F air temperature, installed downstream of

the first coil; or setting the minimum steam pressure at 5 psig.

3. Clean and check operation of steam traps.

4. Check operation of control valves.

5. Check the operation of check valves to prevent conden-

sate flowback.

6. Check operation of thermostatic air vents, if used. A float

and thermostatic trap will contain a thermostatic air vent.

When the bellows is ruptured, it will fail closed.

7. Check operation of vacuum breakers.

8. Check operation of the thermal protection devices used

for freeze-up protection.

9. Steam or condensate should not be allowed to remain in

the coil during the off season.This will prevent the forma-

tion and build up of acids.

There are additional precautions and control strategies, as

found in various catalogues and in the ASHRAE Fundamentals

Handbook and in the Carrier System Design Guide — Piping

Section, when the entering-air temperature to the coil falls be-

low 35 F. These conditions occur when IDT coils are used for

pre-heat and/or face and bypass applications.

Filters

FILTER SECTIONS — See Table 12 for filter data. Filters

are field supplied.

On the size 03 angle filter, a spacer is required on each side

of the filters.

Flat filter section can use 2-in. or 4-in. thick filters. (Size 03

accepts 2-in. filters only.) The flat filter section as shipped ac-

cepts 2-in. filters. Remove angle spacer in each filter track to

provide the 4-in. space required to accommodate 4-in. filters.

On all filter sections except size 03, filters are pushed into

the track until they touch the opposite side of the unit. Any re-

maining space is taken up by the adjustable 2-piece sheet metal

spacer. See Fig. 43 for filter arrangements.

Fan Shaft Bearing Removal

1. Lock open and tag electrical disconnect.

2. Enter through fan section access door or remove panels as

required.

Freeze up protection:

3. Place plywood or other rigid covering on floor to protect

insulation from damage.

1. Use a strainer in the supply line and the dirt leg ahead of

the trap.

4. Block wheel so that it will not pinwheel due to natural

draft through the unit.

5. Loosen motor base to frame bolts. Adjust motor to re-

lease belt tension so removal of belts is done without

stretching. Do not stretch belts over sheaves. Damage to

belt can result.

DX AND ALL

WATER COILS

6. Remove bolts on bushing of fan shaft sheave, insert bolts

in jacking hole provided on bushing and slowly jack

bushing from sheave. Then remove bushing on sheave.

7. Loosen bearing setscrews and locking collar.

8. Remove bearing holddown bolts.

9. Remove bearing while observing the following

precautions:

a. Make certain fan shaft surface is not rough or

scored. If so, clean up surface with fine emery

cloth.

STEAM COILS

ONLY

b. Add a few drops of oil after cleanup of shaft end.

It should not be necessary to drive a new bearing onto

shaft. If light tapping is needed, do not tap against outer

race.

Fig. 42 — Coil Rotation

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Table 12 — Filter Data

39L UNIT SIZE

Angle Filter Section

Filter Qty…Size (in.)

Nominal Face Area (sq ft)

2…16x20

2…16x25

10.00

4…16x20

8…16x25

31.11

4…16x20

8…16x25

31.11

2…16x25

5.56

4…16x20

8.89

4…16x25

11.11

6…16x20

13.33

9…16x20

20.00

12…16x20

26.67

Filter Mixing Box Section

Filter Qty…Size (in.)

Nominal Face Area (sq ft)

2…16x20

2…16x25

10.00

3…16x20

6…16x25

23.33

4…16x20

8…16x25

31.11

2…16x25

5.56

4…16x20

8.89

4…16x25

11.11

6…16x20

13.33

9…16x20

20.00

9…16x20

20.00

Flat Filter Section

2…16x20

2…20x20

2…20x25

2…16x25

22.50

Filter Qty…Size (in.)*

2…16x25

1…20x25

3…16x20

3…20x20

3…20x25

3…16x25

2…16x16

3.56

2…20x20

5.56

2…20x25

6.94

3…20x25

10.42

6…16x20

13.33

Nominal Face Area (sq ft)

9.03

15.00

18.75

*Only 2-in. filters are available on size 03.

SIZE 21

16”

20”

25”

SIZE 25

20”

25”

20”

16”

Fig. 43 — Filter Arrangement, 2-in. and 4-in. Flat

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10. Check fan shaft diameter at bearing mount. If worn by

more than .001 in. below nominal, shaft should be re-

placed.

11. Install new bearing, tighten holddown bolts and then

tighten bearing locking collar and setscrews.

12. Make certain fan wheel does not rub sides of fan housing

after installing new bearings.

13. Recoat fan shaft with a rust inhibitor or grease.

14. Replace sheave and belts. Adjust and align as described

in Installation sections on installing sheaves and V-belts.

15. Remove insulation protection.

16. Replace access panels.

17. Restore electrical power.

Fan and Shaft Removal (Fig. 44) — The fan wheel

and shaft may be removed through inlet side of fan housing.

1. Remove drive belts as described in Fan Shaft Bearing Re-

moval on page 36.

2. Block up fan wheel within housing to prevent dropping

when bearing bolts are removed.

3. Loosen and remove bearing holddown bolts.

4. Remove bearing support channels and inlet ring from one

side.

5. Remove fan shaft and fan wheel from unit.

6. Remove fan shaft from fan wheel.

Fig. 44 — Fan Shaft and Bearing Removal

(Unit without IGVs shown)

7. Replace shaft and wheel into fan in the reverse order of

their removal.

8. Inspect bearings and if serviceable, replace on shaft.

9. Align fan wheel and shaft assembly in fan scroll. Check

cutoff location if wheel failure damaged cutoff plate. See

Fig. 45.

10. Tighten bearing holddown bolts, bearing setscrews and

shaft setscrews.

11. Field balancing of shaft and wheel is recommended.

IMPORTANT: Replacement shafts must have a diam-

+ .0000

eter tolerance at bearing mount of

nominal.

– .001

Carrier-specified parts are recommended.

Lubrication

MOTORS — Lubricate in accordance with nameplate at-

tached to motor or with manufacturer’s recommendations

included with motor.

CUTOFF

CUTOFF CLEARANCE

39L UNIT SIZE

BEARINGS

6⁵/₈

Fan Bearings — Lubricate fan bearings every 3 months

with suitable bearing grease. Typical lubricants are given in

Table 13.

Inlet Vane and Outlet Damper Bearings — These bearings

are oil-impregnated. Annually lubricate with a few drops of

nondetergent SAE (Society of Automotive Engineers) 20 oil.

10³/₈

9³/₄

1¹/₂

1³/₈

1⁵/₈

15³/₄

20¹/₂

2¹¹

Table 13 — Lubricant Data

Fig. 45 — Fan Cutoff Plate Data (in.)

MANUFACTURER

LUBRICANT

Sunoco

Texaco

Mobil

Prestige 42

Multipak 2

Regal AFB-2*

Mobilplex EP No. 1

*Preferred lubricant because it contains rust and oxi-

dation inhibitors.

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METRIC CONVERSION CHART

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

Catalog No. 533-932

Printed in U.S.A.

Form 39L-6SI

Pg 40

1110

2-04

Replaces: 39L-5SI

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