Carrier 50TJ016-028 User Manual

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Page 1

Single-Package Rooftop Units

Electric Cooling with Electric Heat Option

Installation, Start-Up and

Service Instructions

50TJ016-028

CONTENTS

Page

SAFETY CONSIDERATIONS INSTALLATION Step 1 — Provide Unit Support

• ROOF CURB

• ALTERNATE UNIT SUPPORT

Step 2 — Rig and Place Unit

• POSITIONING

• ROOF MOUNT

Step 3 — Field Fabricate Ductwork Step 4 — Make Unit Duct Connections Step 5 — Trap Condensate Drain Step 6 — Make Electrical Connections

• FIELD POWER SUPPLY

• FIELD CONTROL WIRING

• OPTIONAL NON-FUSED DISCONNECT

• OPTIONAL CONVENIENCE OUTLET

Step 7 — Make Outdoor-Air Inlet

Adjustments

• MANUAL OUTDOOR-AIR DAMPER

• OPTIONAL ECONOMI$ER

Step 8 — Install Outdoor-Air Hood Step 9 — Install All Accessories

• MOTORMASTER® I CONTROL INSTALLATION

• MOTORMASTER III CONTROL INSTALLATION

Step 10 — Install Humidistat for Optional

MoistureMiser Dehumidification Package START-UP SERVICE TROUBLESHOOTING START-UP CHECKLIST

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-24

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-31

. . . . . . . . . . . . . . . . . . . . . . . . .1

. . . . . . . . . . . . . . . . . . . . . .1

. . . . . . . . . . . . . . . . . . . . . . . . .1

. . . . . . . . . . . . . . . . . .7

. . . . . . . . . . . . . . .7

. . . . . . . . . . . . . . . . . . . .7

. . . . . . . . . . . . . .8

. . . . . . . . . . . . . . . . . .12

. . . . . . . . . . . . . . . . . . . .15

. . . . . . . . .16

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 32,33

. . . . . . . . . . . . . . . . . . . . . . . . . . CL-1

SAFETY CONSIDERATIONS

Installation and servicing air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance functions of cleaning coils and filters and replacing filters. All other operations should be performed by trained service personnel. When working on air-conditioning equipment, observe precautions in the li terature, ta gs and label s attached t o the uni t, and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguishers available for all brazing operations.

Before performing service or maintenance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury.

IMPORTANT: Units have high ambient operating limits. If limits are exceeded, the unit will automatically lock the compressor out of operation. Manual r eset will be required to restart the compressor.

INSTALLATION

Step 1 — Provide Unit Support

ROOF CURB — Assemble and install accessory roof curb or horizontal adapter roof curb in accordance with instructions shipped with the curb or horizontal adapter. Accessory roof curb and horizontal adapter roof curb and information required to field fabricate a roof curb or horizontal adapter roof curb are shown in Fig. 1 and 2. Install insulation, cant strips, roofing, and counter flashing as shown. Ductwork can be secured to roof curb before unit is set in place.

IMPORTANT: The gasketing of the unit to the roof curb or adapter roof curb is critical for a leak-proof seal. Install gasket supplied with the roof curb or adapter roof curb as shown in Fig. 1. Improperly applied gasket can result in air leaks and poor unit performance.

Curb or adapter roof curb should be level. This is necessary to permit unit drain to function properly. Unit leveling tolerance is ± ry Roof Curb or Horizontal Adapter Roof Curb Installation Instructions for additional information as required.

ALTERNATE UNIT SUPPORT — When the curb or adapter cannot be used, support unit with sleepers using unit curb or adapter support area. If sleepers cannot be used, support long sides of unit with a minimum of 3 equally spaced 4-in. x 4-in. pads on each side.

Step 2 — Rig and Place Unit —

transportation damage. File any claim with transportation agency. Keep unit upright, and do not drop. Use spreader bars over unit to prevent sling or cable damage. Rollers may be used to move unit across a roof. Level by using unit frame as a reference; leveling tolerance is ± tion. See Fig. 3 for additional information. Unit weight is shown in T able 1.

shown in Fig. 3. Refer to rigging instructions on unit. POS ITIONI NG — Provide clearance around and above unit

for airflow, safety, and service access (Fig. 4 and 5).

lets near exhaust vents or other sources of contaminated air.

higher level runoff and overhangs. ROOF MOUNT — Check building codes for weight distribu-

tion requirements.

/16 in. per linear ft in any direction. Refer to Accesso-

Inspect unit for

/16 in. per linear ft in any direc-

Four lifting holes are provided in ends of unit base rails as

Do not install unit in an indoor location. Do not locate air in-

Although unit is weatherproof, guard against water from

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

Book 1 Ta b 1 b

PC 111 Catalog No. 535-034 Printed in U.S.A. Form 50TJ-17SI Pg 1 2-01 Replaces: 50TJ-14SI

Page 2

lb density.

.28 .45 .28 .43

thick neoprene coated 1

″

Deg.in.Deg.in.

DIMENSIONS* (degrees and inches)

ALL

UNIT

below the unit discharge for units equipped with electric

heaters.

A 90 degree elbow must be installed on the supply ductwork

NOTE: To prevent the hazard of stagnant water build-up in the drain

NOTES:

1. Roof curb accessory is shipped disassembled.

2. Insulated panels: 1

3. Dimensions in ( ) are in millimeters.

4. Direction of airflow.

5. Roof curb: 16 ga. (VA03-56) stl.

pan of the indoor section, unit can only be pitched as shown.

PKG. NO. REF. CURB HEIGHT DESCRIPTION

High

″

(305) Standard Curb 14

″

-2

′

CRRFCURB010A00 1

Fig. 1 — Roof Curb Details

(610) Side Supply and Return Curb for High Installation

(610) Standard Curb for Units Requiring High Installation

″

-0

′

CRRFCURB012A00 2

CRRFCURB011A00 2

Page 3

NOTE: For preassembled horizontal adapter roof curb part no.

NOTES:

1. Dimensions in ( ) are in millimeters.

2. Refer to Fig. 4 and 5 for unit operating weights.

3. Remove boards at ends of unit and runners prior to rigging.

4. Rig by inserting hooks into unit base rails as shown. Use corner post from packaging to protect coil from damage. Use bumper boards for spreader bars.

5. Weights do not include optional EconoMi$er. See Fig. 4 and 5 for EconoMi$er weight. See Table 1 for MoistureMiser weight.

6. Weights given are for aluminum evaporator and condenser coil plate fins.

Fig. 3 — Rigging Details

UNIT 50TJ

MAXIMUM

SHIPPING WEIGHT

DIMENSIONS

Lb Kg Ft-in. mm Ft-in. mm

016

1550 703 6-11

/22121 4- 0 1219

020

1650 748 6-11

/22121 3-10 1168

024

1700 771 6-11

/22121 3- 7 1092

028

1850 839 6-11

/22121 3- 5 1041

All panels must be in place when rigging.

CRRFCURB013A00, the accessory kit includes a factory-designed, high-static, transition duct. For horizontal curb part no. CRRFCURB012A00, a field-supplied transition duct is required.

Fig. 2 — Horizontal Adapter Roof Curb

and Roof Curb

Page 4

(8) on

″

′

DIM A DIM B DIM C

(D)

CORNER

(C)

CORNER

(B)

CORNER

(A)

CORNER

WEIGHT

ECONOMI$ER

WEIGHT

STD UNIT

Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Ft-in. mm Ft-in. mm Ft-in. mm

(1219) for proper operation of damper and

(1219) if conditions permit coil removal from the

″

(1219) for proper condenser coil airflow.

-0

′

″

-0

′

(2134) for coil removal. This dimension can be

(1219) for control box access.

-0

′

″

-0

′

reduced to 4

Rear: 7

1. Refer to print for roof curb accessory dimensions.

2. Dimensions in [ ] are in millimeters.

3. Center of gravity.

NOTES:

1550 703 80 36.3 391 177 365 166 384 174 410 186 3-5 1041 3-6 1067 1-10 559

1650 748 80 36.3 399 181 384 174 402 182 439 199 3-4 1016 3-6 1067 1- 8 508

•

4. Direction of airflow.

5. Ductwork to be attached to accessory roof curb only.

6. Minimum clearance:

(1829) to assure proper condenser fan operation.

″

-0

′

-0

′

top.

power exhaust if so equipped.

Left side: 4

Front: 4

Right side: 4

Top: 6

Local codees or jurisdiction may prevail.

•

each side for top cover drip edge.

damper/power exhaust as stated in Note #6, a removable fence or

barricade requires no clearance.

9. See drawing 50TJ500352 for service option details.

7. With the exception of clearance for the condenser coil and the

8. Dimensions are from outside of corner post. Allow 0

POWER EXHAUST/BAROMETRIC RELIEF

(ACCESSORY ONLY)

UNIT

50TJ016

50TJ020

Fig. 4 — Base Unit Dimensions, 50TJ016,020

Page 5

DIM ADIM BDIM C

(D)

CORNER

(C)

CORNER

(B)

CORNER

(A)

CORNER

(8) on

″

′

(1219) for proper operation of damper and

(1219) if conditions permit coil removal from the

″

(1219) for proper condenser coil airflow.

-0

′

″

-0

′

(2134) for coil removal. This dimension can be

(1219) for control box access.

-0

′

″

Left side: 4

•

-0

′

Front: 4

•

(1829) to assure proper condenser fan operation.

″

-0

′

power exhaust if so equipped.

Right side: 4

Top : 6

Local codees or jurisdiction may prevail.

•

damper/power exhaust as stated in Note #6, a removable fence or

barricade requires no clearance.

each side for top cover drip edge.

7. With the exception of clearance for the condenser coil and the

8. Dimensions are from outside of corner post. Allow 0

9. See drawing 50TJ500352 for service option details.

POWER EXHAUST/BAROMETRIC RELIEF

(ACCESSORY ONLY)

-0

′

reduced to 4

top.

Rear: 7

1. Refer to print for roof curb accessory dimensions.

2. Dimensions in [ ] are in millimeters.

3. Center of gravity.

NOTES:

•

4. Direction of airflow.

5. Ductwork to be attached to accessory roof curb only.

6. Minimum clearance:

WEIGHT

ECONOMI $ER

WEIGHT

STD UNIT

UNIT

Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Lb Kg Ft-in. mm Ft- in. mm Ft-in. mm

1700 771 80 36.3 419 190 394 179 425 193 463 210 3-4 1016 3-5 1041 1-8 508

50TJ024

1850 839 80 36.3 428 194 412 187 511 232 499 226 3-2 965 3-7 1092 1-8 508

50TJ028

Fig. 5 — Base Unit Dimensions, 50TJ024,028

Page 6

Table 1 — Physical Data

UNIT 50TJ

208/230, 460 v 575 v NOMINAL CAPACITY (tons) 15 18 20 25 OPERATING WEIGHT 1550 1650 1700 1850

EconoMi$er 80 MoistureMiser Dehumidification

Package

COMPRESSOR/MANUFACTURER Scroll, Copeland

Quantity...Model (Ckt 1, Ckt 2) Capacity Stages (%) 55, 45 55, 45 60, 40

Number of Refrigerant Circuits 22 2 Oil (oz) (Ckt 1, Ckt 2) 106, 81 106,106 136, 106

REFRIGERANT TYPE R-22

Expansion Device TXV Operating Charge (lb-oz) Circuit 1* 10-10 Circuit 2 12-3 13-6 13- 0

CONDENSER COIL Cross-Hatched

Rows...Fins/in. 2...17 Total Face Area (sq ft) 21.7 21.7 21.7

CONDENSER FAN Propeller Type

Nominal Cfm 10,500 10,500 14,200 14,200 Quantity...Diameter (in.) 3...22 3...22 2...30 2...30 Motor Hp...Rpm Watts Input (Total) 1100 1100 3400 3400

EVAPORATOR COIL Cross-Hatched

Rows...Fins/in. 2...17 3...15 3...15 4...15 Total Face Area (sq ft) 17.5 17.5 17.5 17.5

EVAPORATOR FAN Centrifugal Type

Quantity...Size (in.) 2...10 x 10 2...10 x 10 2...12 x 12 2...12 x 12 2...12 x 12 Type Drive Belt Belt Belt Belt Belt Nominal Cfm 6000 6000 7200 8000 10,000 Motor Hp 3.7 3.0 5 7.5 10 Motor Nominal Rpm 1725 1725 1745 1745 1740

Maximum Continuous Bhp 4.25 3.45 5.90 Motor Frame Size 56H 56H 184T 213T 215T

Nominal Rpm High/Low ——— — — Fan r/s Range Low-Medium Static 891-1179 1159-1429 910-1095 1002-1225 1066-1283

Motor Bearing Type Ball Ball Ball Ball Ball Maximum Allowable Rpm 1550 1550 1550 1550 1550 Motor Pulley Pitch Diameter Low-Medium Static 3.1/4.1 4.3/5.3 4.9/5.9 5.4/6.6 4.9/5.9

Min/Max (in.) High Static 3.7/4.7 — 4.9/5.9 5.4/6.6 4.9/5.9 Nominal Motor Shaft Diameter (in.) Fan Pulley Pitch Diameter (in.) Low-Medium Static 6.0 6.4 9.4 9.4 8.0

Nominal Fan Shaft Diameter (in.) 1 Belt, Quantity...Type...Length (in.) Low-Medium Static 1...BX...42 1...BX...45 1...BX...50 1...BX...53 2...BX...50

Pulley Center Line Distance (in.) 13.5-15.5 13.5-15.5 13.3-14.8 14.6-15.4 14.6-15.4 Speed Change per Full Turn of

Movable Pulley Flange (rpm) Movable Pulley Maximum Full Turns

From Closed Position 666 6 6 Factory Speed 3.5 3.5 3.5 3.5 3.5 Factory Speed Setting (rpm Low-Medium Static 1035 1296 1002 1120 1182

Fan Shaft Diameter at Pulley (in.) 1

HIGH-PRESSURE SWITCH (psig)

Cutout 426 Reset (Auto) 320

LOW-PRESSURE SWITCH (psig)

Cutout 27 Reset (Auto) 44

FREEZE PROTECTION THERMOSTAT (F)

Opens 30 ± 5 Closes 45 ± 5

OUTDOOR-AIR INLET SCREENS Cleanable

Quantity...Size (in.) 2...20 x 25 x 1

RETURN-AIR FILTERS Throwaway†

Quantity...Size (in.) 4...20 x 20 x 2

High Static 1227-1550 — 1069-1287 1193-1458 1332-1550

High Static 5.2 — 8.0 7.9 6.4

High Static 1...BX...42 — 1...BX...48 1...BX...50 2...BX...47

Low-Medium Static 48 44 37 37 36 High Static 55 — 34 44 45

High Static 1389 — 1178 1328 1470

POWER EXHAUST

LEGEND

Bhp — Brake Horsepower TXV — Thermostatic Expansion Valve

*Circuit 1 uses the lower por tion of condenser coil and lower portion of evap-

orator coils; and Circuit 2 uses the upper portion of both coils.

016

020 024 028

80 80 80

2...ZR94KC 50, 50

81, 81

10-10

Aluminum Pre-Coated, or Copper Plate Fins

21.7

/2...1050

/2 Hp, 208/230-460 v Motor Direct Drive, Propeller-Fan (Factory-Wired for 460 v)

13/

†The 50TJ028 units requires 2-in. industrial-grade filters capable of handling

face velocities of up to 625 ft/min (such as American Air Filter no. 5700 or equivalent).

NOTE: The 50TJ016-028 units have a low-pressure switch (standard) located on the suction side.

40 40 40

1...ZR108KC,

1...ZR94KC

15-5 16-0 20-13

/8-in. Copper Tubes, Aluminum Lanced,

3...15 3...15 4...15

/2...1050 1...1075 1...1075

/8-in. Copper Tubes, Aluminum Lanced or

Copper Plate Fins, Face Split

11/

17/

1...20 x 20 x 1

4...16 x 20 x 2

1...ZR125KC,

1...ZR108KC

8.7 [208/230, 575 v]

9.5 [460 v]

13/

17/

1...ZR16M3,

1...ZR125KC

10.2 [208/230, 575 v]

11.8 [380, 460 v]

17/

13/

Page 7

Step 3 — Field Fabricate Ductwork —

3/4" FPT DRAIN CONNECTION

1-3/8" DRAIN HOLES

Shaded area indicates block-off panels.

NOTE: Dimensions A, A′, and B, B′ are obtained from field-supplied ceiling diffuser.

Fig. 8 — Concentric Duct Details

Fig. 9 — Condensate Drain Details

(50TJ016,020 Shown)

Secure all ducts to building structure. Use flexible duct connectors between unit and ducts as required. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with applicable codes.

Ducts passing through an unconditioned space must be in-

sulated and covered with a vapor barrier.

The 50TJ units with electric heat require a 1-in. clearance

for the first 24 in. of ductwork.

Outlet grilles must not lie directly below unit discharge.

NOTE: A 90-degree elbow must be provided in the ductwork to comply with UL (Underwriters’ Laboratories) codes for use with electric heat.

For vertical supply and return units, tools or parts could drop into ductwork and cause an injury. Install a 90 degree turn in the return ductwork between the unit and the conditioned space. If a 90 degree elbow cannot be installed, then a grille of sufficient strength and density should b e installed to prevent objects from falling into the conditioned space. Due to electric heater, supply duct will require 90 degree elbow.

Step 4 — Make Unit Duct Connections —

Unit is shipped for through-the-bottom duct connections. Ductwork openings are shown in Fig. 6. Field-fabricated concentric ductwork may be connected as shown in Fig. 7 and 8. Attach all ductwork to roof curb and roof curb basepans. Refer to installation instructions shipped with accessory roof curb for more information.

Step 5 — Trap Condensate Drain —

and 9 for drain location. Plug is provided in drain hole and must be removed when unit is operating. One

See Fig. 4, 5,

/4-in. halfcoupling is provided inside unit evaporator section for condensate drain connection. An 81/2 in. x 3/4-in. diameter nipple and a 2-in. x

/4-in. diameter pipe nipple are coupled to standard

/4-in. diameter elbows to provide a straight path down through holes in unit base rails (see Fig. 10). A trap at least 4-in. deep must be used.

NOTE: Do not drill in this area; damage to basepan may result in water leak.

Fig. 6 — Air Distribution — Thru-the-Bottom

(50TJ020-028 Shown)

NOTE: Do not drill in this area; damage to basepan may result in water leak.

Fig. 7 — Concentric Duct Air Distribution

(50TJ020-028 Shown)

Page 8

Fig. 10 — Make Electrical Connections

TB1 MAXIMUM WIRE SIZE

LEGEND

Fig. 11 — Field Power Wiring Connections

UNIT 50TJ

VOLTAGE

208/230,380 460 575

All

350 kcmil 2/0 2/0

EQUIP —

Equipment

GND —

Ground

kcmil —

Thousand Circular Mils

NEC —

National Electrical Code

TB —

Terminal Block

UNIT LOW-VOLTAGE CONNECTIONS

Fig. 12 — Field Control Thermostat Wiring

Step 6 — Make Electrical Connections

FIEL D POWER SUP PLY — Unit is factory wired for voltage shown on nameplate.

When installing units, provide a disconnect, per NEC (National Electrical Code) requirements, of adequate size (T able 2).

All field wiring must comply with NEC and local requirements.

Route power lines through control box access panel or unit basepan (Fig. 4 and 5) to connections as shown on unit wiring diagram and Fig. 11.

Operating voltage to compressor must be within voltage range indicated on unit nameplate. On 3-phase units, voltages between phases must be balanced within 2% and the current must be balanced within 10%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

Unit failure as a result of operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components.

FIELD CONTR OL WIRING — Install a Carrier-approved accessory thermostat assembly according to the installati on instructions included with the accessory. Locate thermostat assembly on a solid wall in the conditioned space to sense average temperature.

Route thermostat cable or equivalent single leads of no. 18 A WG (American Wire Gage) colored wire from subbase terminals through conduit in unit to low-voltage connections as shown on unit label wiring diagram and in Fig. 12.

NOTE: For wire runs up to 50 ft, use no. 18 AWG insulated wire (35 C minimum). For 50 to 75 ft, use no. 16 AWG insulated wire (35 C minimum). For over 75 ft, use no. 14 AWG insulated wire (35 C minimum). All wire larger than no. 18 AWG cannot be direct ly connected to the thermostat and will require a junction box and splice at the thermostat.

Set heat anticipator settings as indicated in Tabl e 3. Settings may be changed slightly to provide a greater degree of comfort for a particular installation.

The correct power phasing is critical in the operation of the scroll compressors. An incorrect phasing will cause the compressor to rotate in the wrong direction. This may lead to premature compressor failure.

Use the following formula to determine the percentage of

voltage imbalance. Percentage of Voltage Imbalance

= 100 x

EXAMPLE: Supply voltage is 460-3-60.

Determine maximum deviation from average voltage:

max voltage deviation from average voltage

average voltage

AB = 452 v BC = 464 v AC = 455 v

A verage Voltage =

(AB) 457 – 452 = 5 v (BC) 464 – 457 = 7 v

(AC) 457 – 455 = 2 v Maximum deviation is 7 v. Determine percent voltage imbalance:

Percentage of Voltage Imbalance = 100 x

= 1.53%

This amount of phase imbalance is satisfactory as it is be-

low the maximum allowable 2%.

455 + 464 + 455

1371

= 457

457

THERMOSTAT ASSEMBLY

REMOVABLE JUMPER

RED

Y1 Y2

BLU

PNK

W1Y2

ORN

VIO

BLK

BRN

WHT

Page 9

Table 2 — Electrical Data

UNIT 50TJ

016

(15 Tons)

020

(18 Tons)

024

(20 Tons)

NOMINAL

VOLTAGE

(3 Ph,

60 Hz)

208/230 187 253 28.8 195 28.8 195 3 0.5 1.7 3.7 10.5/11.0

380 342 418 15.0 123 15.0 123 3 0.5 1.7 3.7 3.9

460 414 508 14.7 95 14.7 95 3 0.5 0.8 3.7 4.8

575 518 633 10.8 80 10.8 80 3 0.5 0.75 3.0 3.9

208/230 187 253 30.1 225 28.8 195 3 0.5 1.7 5.0 15.8/15.8

460 414 508 15.5 114 14.7 95 3 0.5 0.8 5.0 7.9

575 518 633 12.1 80 10.8 80 3 0.5 0.75 5.0 6.0

208/230 187 253 37.8 239 30.1 225 2 1 6.6 7.5 25.0/25.0

380 342 418 21.2 145 16.7 140 2 1 3.9 7.5 15.0

460 414 508 17.2 125 15.5 114 2 1 3.3 7.5 13.0

575 518 633 12.4 80 12.1 80 2 1 3.4 7.5 10.0

VOLTAGE

RANGE

Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP†

COMPRESSOR

No. 1 No. 2

OFM IFM

POWER

EXHAUST

—— — — 81/81 100/100

4.6 18.8 ——85/86 110/110 ——26/34 71/82 102/116 110/125

4.6 18.8 26/34 71/82 108/122 110/125 ——42/56 117/135 159/149 175/175

4.6 18.8 42/56 117/135 165/155 175/175 ——56/75** 156/180 169/194 200/225

4.6 18.8 56/75** 156/180 175/200 200/225 —— — — 43 50

2.3 6.0 —— 45 60 —— 20 30 43 50

2.3 6.0 20 30 46 60 —— 35 52 70 80

2.3 6.0 35 52 73 80 —— — — 40 50

2.3 6.0 —— 43 50 —— 32 39 55 60

2.3 6.0 32 39 58 60 —— 55 66 72 80

2.3 6.0 55 66 75 80 —— 80** 96 102 110

2.3 6.0 80** 96 105 110 —— — — 30 40

2.1 4.8 —— 32 40 —— 50** 48 67 70

2.1 4.8 50** 48 70 70 —— — — 87/87 110/110

4.6 18.8 ——92/92 110/110 ——26/34 71/82 109/122 110/125

4.6 18.8 26/34 71/82 114/128 125/150 ——42/56 117/135 166/155 175/175

4.8 18.8 42/56 117/135 172/161 175/175 ——56/75** 156/180 176/200 200/225

4.6 18.8 56/75** 156/180 182/206 200/225 —— — — 44 50

2.3 6.0 —— 47 60 —— 32 39 59 60

2.3 6.0 32 39 61 70 —— 55 66 76 90

2.3 6.0 55 66 79 90 —— 80** 96 106 125

2.3 6.0 80** 96 109 125 —— — — 34 40

2.1 4.8 —— 36 40 —— — — 116/116 150/150

4.6 18.8 ——120/120 150/150 ——26/34 71/82 120/134 150/150

4.6 18.8 26/34 71/82 126/140 150/150 ——42/56 117/135 178/166 200/175

4.6 18.8 42/56 117/135 183/172 200/175 ——56/75** 156/180 187/211 200/225

4.6 18.8 56/75** 156/180 193/217 200/225 —— — — 66 80

2.3 6.0 —— 68 80 —— 20 30 66 80

2.3 6.0 20 30 68 80 —— 35 52 84 90

2.3 6.0 35 52 87 90 —— — — 57 70

2.3 6.0 —— 59 70 —— 32 39 65 70

2.3 6.0 32 39 68 70 —— 55 66 82 90

2.3 6.0 55 66 85 90 —— 80** 96 112 125

2.3 6.0 80** 96 115 125 —— — — 44 50

2.1 4.8 —— 46 50

ELECTRIC

HEAT*

POWER SUPPLY

Page 10

Table 2 — Electrical Data (cont)

UNIT 50TJ

(25 Tons)

LEGEND

FLA — HACR— IFM — LRA — MCA — MOCP— NEC — OFM — RLA —

*Heater capacity (kW) is based on heater voltage of 208 v, 240 v,

380 v, 480 v, and 575 v. Heaters are rated at 240 v, 380 v, 480 v, or 600 v. If power distribution voltage to unit varies from rated heater voltage, heater kW will vary accordingly.

†Fuse or HACR circuit breaker.

**Heaters are field installed only. NOTES:

1. In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR breaker. Canadian units may be fuse or circuit breaker.

Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply voltage is greater than 2%.

the percent of voltage imbalance. % Voltage Imbalance

= 100 x

NOMINAL

VOLTAGE

(3 Ph,

60 Hz)

208/230 187 253 41.0 350 37.8 239 2 1 6.6 10.0 28.0/28.0

028

380 342 418 21.8 151 21.2 145 2 1 3.9 10.0 17.0

460 414 508 21.8 158 17.2 125 2 1 2.8 10.0 14.6

575 518 633 17.3 125 12.4 80 2 1 3.4 10.0 13.0

Full Load Amps Heating, Air Conditioning and Refrigeration Indoor (Evaporator) Fan Motor Locked Rotor Amps Minimum Circuit Amps Maximum Overcurrent Protection National Electrical Code Outdoor (Condenser) Fan Motor Rated Load Amps

max voltage deviation from average voltage

VO LTAG E

RANGE

Min Max RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA kW FLA MCA MOCP†

Use the following formula to determine

average voltage

COMPRESSOR

No. 1 No. 2

OFM IFM

Example: Supply voltage is 460-3-60.

Determine maximum deviation from average voltage.

(AB) 457 – 452 = 5 v (BC) 464 – 457 = 7 v

(AC) 457 – 455 = 2 v Maximum deviation is 7 v. Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x

This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

3. MCA calculation for units with electric heaters over 50 kW = (1.25 x IFM amps) + (1.00 x heater FLA).

POWER

EXHAUST

—— — — 130/130 150/150

4.6 18.8 ——135/135 175/175 ——26/34 71/82 130/138 150/150

4.6 18.8 26/34 71/82 135/143 175/175 ——42/56 117/135 181/170 200/175

4.6 18.8 42/56 117/135 187/176 200/200 — - 56/75** 156/180 191/215 200/225

4.6 18.8 56/75** 156/180 197/221 200/225 —— — — 73 90

2.3 6.0 —— 76 90 —— 20 30 73 90

2.3 6.0 20 30 76 90 —— 35 52 87 90

2.3 6.0 35 52 90 90 —— — — 66 80

2.3 6.0 —— 68 80 —— 32 39 67 80

2.3 6.0 32 39 70 80 —— 55 66 84 90

2.3 6.0 55 66 87 100 —— 80** 96 114 125

2.3 6.0 80** 96 117 125 —— — — 54 70

2.1 4.8 —— 56 70

AB = 452 v BC = 464 v AC = 455 v

Average Voltage =

= 1.53%

ELECTRIC

HEAT*

= 457

7 457

POWER SUPPLY

452 + 464 + 455

1371

Page 11

OPTIONAL NON-FUSED DISCONNECT — On units with

CONTROL MODULE

ACTUATOR

ECONOMI$ER

Fig. 14 — 25% Outdoor-Air Section Details

Fig. 15 — EconoMi$er Damper Assembly

— End View

the optional non-fused disconnect, incoming power will be wired into the disconnect switch. Refer to Fig. 13 for wiring for 100 and 200 amp disconnect switches. Units with an MOCP under 100 will use the 100 amp disconnect switch. Units with an MOCP over 100 will use the 200 amp disconnect switch. Refer to the applicable disconnect wiring diagram.

To prevent breakage during shipping, the disconnect handle and shaft are shipped and packaged inside the unit control box. Install the disconnect handle before unit operation. To install the handle and shaft, perform the following procedure:

1. Ope n the control box door and remove the handle and shaft from shipping location.

2. Loosen the A llen bolt located on the disconnect switch. The bolt is located on the square hole and is used to hold the shaft in place. The shaft cannot be inserted until the Allen bolt is moved.

3. Insert the disconnect shaft into the square hole on the disconnect switch. The end of the shaft is specially cut and the shaft can only be inserted in the correct orientation.

4. Tighten the Allen bolt to lock the shaft into position.

5. Close the control box door.

6. Attach the handle to the external access door with the two screws provided. When the handle is in the ON position, the handle will be vertical. When the handle is in the OFF position, the handle will be horizontal.

7. Turn the handle to the OFF position and close the door. The handle should fit over the end of the shaft when t he door is closed.

8. The ha ndle must be in the OFF position to open the control box door.

OPTIONAL CONVENIENCE OUTLET — On units with optional convenience outlet, a 115-v GFI (ground fault interrupt) convenience outlet receptacle is provided for field wiring. Field wiring should be run through the

/8-in. knockout pro-

vided in the basepan near the return air opening.

Step 7 — Make Outdoor-Air Inlet Adjustments

MANUAL OUTDOOR-AIR DAMPER — All units (except those equipped with a factory-installed economizer) have a manual outdoor-air damper to provide ventilation air. Damper can be preset to admit up to 25% outdoor air into return-ai r compartment. To adjust, loosen securing screws and move damper to desired setting. Then retighten screws to secure damper (Fig. 14).

OPTIONAL ECONOMI$ER EconoMi$er Motor Control Module (Fig. 15-17)

ECONSP dial to the ‘ ‘D’’ setting (Fig. 16). The control module is located on the EconoMi$er motor. See Fig. 15 and 17.

Damper Vent Position Setting

1. Set fan switch at ON position (continuous fan operation) and close night switch if used.

2. Set system selector switch to OFF position.

3. Turn Min Pos (%) dial slowly until dampers assume desired vent position.

Do not manually operate EconoMi$er

motor since damage to motor will result.

— Set the

NOTE: The disconnect takes the place of TB-1 as shown on the unit wiring diagram label and the component arrangement label.

Fig. 13 — Optional Non-Fused Disconnect Wiring

6T3 4T2 2T1 LOAD

5L3 3L2 1L1 LINE

Page 12

Table 3 — Heat Anticipator Settings

Fig. 18 — Outdoor-Air Hood Component Location

UNIT 50TJ

016-028

*Heater kW is based on heater voltage of 208 v, 240 v, 380 v, 480 v,

and 575 v.

UNIT

VOLTAGE S

208/230-3-60

380-3-60

460-3-60

575-3-60

kW* STAGE 1 STAGE 2

26/34 .40 .66 42/56 .66 .40 56/75 .66 .66

20 .40 .40 35 .40 .66

32 .40 .40 55 .40 .66

80 .66 .66 50 .66 .66

Fig. 16 — EconoMi$er Control Module

Adjustment Potentiometers

CONTROL MODULE ACTUATOR

Fig. 17 — EconoMi$er Control Module Location

Step 8 — Install Outdoor-Air Hood —

The same type of factory-installed hood is used on units with 25% air ventilation and units with an EconoMi$er.

NOTE: The hood top panel, upper and lower filter retainers, hood drain pan, baffle (028), and filter support bracket are secured opposite the condenser end of the unit. The screens, hood side panels, remaining section of filter support bracket, seal strip, and all other hardware are in a package located inside the return-air filter access panel (Fig. 18).

1. Attach seal strip to upper filter retainer. See Fig. 19.

2. Assemble hood t op panel and side panels, upper filter retainer, and hood drain pan (Fig. 20).

3. Secure l ower filte r retainer and long se ction of filter support bracket to unit. See Fig. 20. Leave screws loose on 028 units.

4. Slide baffle (size 028 unit) behind lower filter retainer and tighten screws.

5. Loosen sheet metal screws for base unit top panel located above outdoor-air inlet opening, and remove screws for hood side panels located on the sides of the outdoor-air inlet opening.

6. Match notches in hood top panel to unit top panel screws. Insert hood flange between unit top panel flange and unit. Tighten screws.

7. Hold hood side pa nel flanges flat aga inst unit, and install screws removed in Step 5.

8. Insert outdoor-air inlet screens and spacer in channel created by lower filter retainer and filter support bracket.

9. Attach remaining short section of filter support bracket.

OUTDOOR AIR ENTHALPY SENSOR INSTALLATION — Perform the following procedure to install the outdoor air enthalpy sensor (part no. CROUTENT001A00).

1. Remove the outdoor air temperature sensor cover. See Fig. 21. Save cover and screws.

2. Disconnect the wiring from the installed outdoor air temperature sensor. See F ig. 22.

3. Us e a

/4-in. nut driver to remove the 2 screws securing

the outdoor air temperature sensor to the sheet metal.

4. Mount the outdoor air enthalpy sensor in t he outdoor air temperature sensor location using the screws removed in Step 3.

5. Connect the outdoor air enthalpy sensor wiring harness to the EconoMi$er control module and sensor.

6. Re-install sensor cover saved from Step 1.

RETURN AIR TEMPERATURE SENSOR OR RETURN AIR ENTHALPY SENSOR INSTALLATION — Perform the following procedure to install the return air temperature sensor (part no. CRRETTMP001A00) or return air enthalpy sensor (part no. CRRETENT001A00).

1. Attach the sensor to the mounting bracket using 2 selftapping

2. Mount the bracket to the inside of the return air opening flange using a

/2-in. screws provided .

/4-in. nut driver and 2 no. 6 sheet metal

screws.

NOTE: The sensor must be mounted in an upright position.

3. Feed the sensor wiring through the bushing in EconoMi$er to secure wires.

4. Route sensor wiring harness from sensor to EconoMi$er control module. Secure wiring harness to the original harness using tie wraps.

5. Wire the sensor to the EconoMi$er control module. See Fig. 23 and 24.

Page 13

SENSOR COVER

OUTSIDE AIR SENSOR

MOUNTING SCREW

WIRING HARNESS

SENSOR WIRING CONNECTIONS

Fig. 22 — Outdoor-Air Sensor Details

Fig. 21 — Outdoor-Air Sensor Location

Fig. 19 — Seal Strip Location

(Air Hood Cross-Sectional View)

BAFFLE (028 ONLY)

HOOD TOP PANEL

NOTE: The outdoor-air hood comes with a baffle which is used on 028 units only; discard baffle for 016-024 units.

Fig. 20 — Outdoor-Air Hood Details

COMMISSION ING — The EconoMi$er saves energy when it uses outdoor air to provide free cooling instead of mechanical air conditioning. The EconoMi$er switchover strategy determines if the outdoor air is suitable for free cooling. The EconoMi$er chooses the switchover strategy with the most energy savings, provided that the required sensors are connected and functioning normally.

IMPORTANT: If a sensor stops functioning normally (becomes unreliable), the EconoMi$er switches to the next best strategy.

LOWER FILTER RETAINER

FILTER SUPPORT BRACKET

HOOD DRAIN PAN

UPPER FILTER RETAINER

HOOD SIDE PANELS (2)

BAFFLE (028 ONLY)

LOWER FILTER RETAINER

Refer to Table 4 to determine the sensors required for each

strategy . Differential Enthalpy Switchover Strategy

— The differential enthalpy switchover strategy must be selected manually, if required. To enable, press and hold the CONFIG button for 30 seconds, then release. The LED will flash twice to indicate the change of configuration.

T o ret urn to s ingle enthalpy mode, p ress and hold t he CO NFIG button for 30 seconds. The LED will flash once to indicate the change of configuration.

DISCHARGE AIR THERMISTOR (DAT) — The discharge air thermistor is factory-mounted on the supply-fan housing in the fan section of the unit. The DAT is factory-wired to the EconoMi$er Control Module.

CONTROL SETUP — If a CO2 sensor is not being

used, proceed to the next section. If a CO2 sensor is being used, perform the following:

1. Determine the value at which you want the minimum position of the dampers to begin opening to allow a greater amount of outdoor air to enter. The range is 800 to 1,400 ppm.

2. Locate the CO

SP (PPM) potentiometer and adjust to the

desired set point. See Fig. 16.

Page 14

MECHANICAL COOLING LOCKOUT — Determine the outdoor-air temperature at which you want the mechanical cooling (compressors) to be disabled. Locate the mechanical cooling lockout (MECH CLG LOCKOUT) potentiometer. To disable this feature, turn the potentiometer counterclockwise (CCW) to the OFF position. Otherwise, set the value between 10 and 60 F. Mechanical cooling will not operate when the outdoor air temperature is below this value. See Fig. 16.

Table 4 — EconoMi$er Switchover Control Strategy

DRY BULB CHANGEOVER SET UP — Dete rmine the dry bulb changeover set point from Table 5. The settings are A, B, C and D. Locate the ECON SP potentiometer and set the dry bulb changeover set point. See Fig. 16. When the OAT is above this set point, the damper is limited to minimum position setting.

If a potentiometer fails, its setting will default to the values

in Ta ble 6.

ECONOMI$ER SWITCHOVER

STRATEGY

Dry Bulb X

Single Enthalpy X

Differential Temperature XX

Differential Enthalpy* XX

*Must be selected manually.

Outdoor Air Temperature Outdoor Air Enthalpy Return Air Temperature Return Air Enthalpy

Table 5 — Changeover Set Points

SETTINGS ABCD Dry Bulb (°F) 73 69 66 63 Single Enthalpy* (Btu/lb) 27 25 24 22 Differential Temperature*

(°F, Not Adjustable) Differential Enthalpy*

(Btu/lb, Not Adjustable)

*Field-installed accessory.

2222

1111

SENSORS REQUIRED

Table 6 — Default Potentiometer Settings

POTENTIOMETER DEFAULT SETTING

CO2 SP (PPM) 1,000 MECH CLG LOCKOUT 50 F ECON SP D MIN POS (%) 20

LEGEND

COM — DAT — DM — GND — OAH — OAT — POT — RAH — RAT — REM —

*OAT sensor shipped with economizer option. OAH, RAT, RAH and CO

Common Discharge Air Thermistor Damper Motor Ground Outdoor-Air Enthalpy Sensor Outdoor-Air Temperature Sensor Potentiometer Return-Air Enthalpy Sensor Return-Air Temperature Sensor Remote

Fig. 23 — Typical EconoMi$er Sensor Wiring

are field-installed accessories.

Page 15

VENTILATION AIR (Minimum Position Set Up) — If ventilation air is not required, skip this section. If ventilation air is required, perform the following:

1. The indoor fan must be on to set the ventilation air. Either put the thermostat in the continuous fan mode or jumper the R and G terminals at the rooftop unit connection board.

2. Loca te the minimum position (MIN PO S) potentiometer. Turn the potentiometer full CCW to fully close the out door air dampers. Turn the potentiometer gradually clockwise (CW) to the desired position. See Fig. 16.

3. Replace the filter access panel. See Fig. 18. Ensure the filter access panel is securely engaged.

4. Calculate the minimum airflow across the EconoMi$er. a. Calculate % of outside air using the following

formula. % Outdoor air through EconoMi$er

% Outdoor air =

Mixture T emp – Return Air Temp Outdoor T emp – Return Air Temp

b. Multiply total CFM by percentage outdoor air, this

gives outdoor air volume in CFM.

Personal Injury Hazard.

Avoid possible injury by keep-

ing fingers away from damper blades.

Step 9 — Install All Accessories —

After all the factory-installed options have been adjusted, install all fieldinstalled accessories. Refer to the accessory installation instructions included with each accessory .

MOTORMASTER® I CONTROL INSTALLATION (50TJ016 and 020 Only)

Install Field-Fabricated Wind Baffles

— Wind baffles must be field-fabricated for all units to ensure proper cooling cycle operation at low ambient temperatures. See Fig. 25 for baffle details. Use 20-gage, galvanized sheet metal, or similar corrosion-resistant metal for baffles. Use field-supplied screws to attach baffles to unit. Screws should be

/8-in. long. Drill required screw holes for mounting baffles.

/4-in. diameter and

To avoid damage to the refrigerant coils and electrical components, use recommended screw sizes only. Use care when drilling holes.

Outdoor Air Enthalpy

CROUTENT001A00

OAT COM OAH +15V RAT COM RAH +15V

(+)

COM DAT COM REM POT COM LED COM

Tan Violet White Red

T C O M

Minimum Position

1k ohm Potentiometer

O U

Remote

Violet

C O M

O U TT

Unoccupied Control

(Part num ber on the control

must be AD-DME1701-1

or AD-DME1711-1.)

Unoccupied

Contact

24 VAC must be present

on BI for the system to be

Violet

470 ohm

5watt

Resistor

unoccupied.

Return Air Enthalpy CRRETENT001A00

CO2 Sensors:

323ZCSENCO

NOT

USED

2to10VDCat

0 to 2000 ppm

Line

20 VA

24 VAC

Voltage

20 mA LED

Remote

LED

Field-supplied Wiring Wiring Included

Fig. 24 — Typical EconoMi$er Sensor Wiring

Page 16

Install Motormaster I Controls

NOTE: Dimensions in ( ) are in mm.

Fig. 25 — Wind Baffle Details

— Only one Motormaster I control is required per unit. The Motormaster I control must be used in conjunction with the Accessory 0° F Low Ambient Kit (purchased separately). The Motormaster I device controls outdoor fan no. 1 while outdoor fans no. 2 and 3 are sequenced off by the Accessory 0° F Low Ambient Kit.

Accessory 0° F Low Ambient Kit —

Install the Accessory 0° F

Low Ambient Kit per instruction supplied with accessory.

Sensor Assembly —

Install the sensor assembly in the location

shown in Fig. 26.

Motor Mount —

T o ensure proper fan height, replace the existing motor mount with the new motor mount provided with accessory.

Transformer (460 and 575-v Units Only) —

On 460 and 575-volt units a transformer is required. The transformer is provided with the accessory and must be field-installed.

Motormaster I Control —

Recommended mounting location is on the inside of the panel to the left of the control box. The control should be mounted on the inside of the panel, vertically, with leads protruding from bottom of extrusion.

MOTORMASTER® III CONTROL INSTALLATION (50TJ024 and 028 Only)

Install Field-Fabricated Wind Baffles

/8-in. long. Drill required screw holes for mounting baffles.

/4-in. diameter and

T o avoid damage to the refrigerant coils and electrical components, use recommended screw sizes only. Use care when drilling holes.

Replace Outdoor Motor

— Replace outdoor fan motor no. 1 with motor included in accessory kit. Existing motor is not Motormaster® III compatible.

Install Motormaster III Controls

— Only one Motormaster

III control is required per unit.

Sensor —

Install the sensor for thermistor input control in the location shown in Fig. 27. Connect sensor leads to the purple and grey control signal leads on the Motormaster III control.

Signal Selection Switch —

Remove the cover of the Motormaster III control. Set the switch to accept the thermistor sensor input signal. Set the frequency to match the unit power supply (60 Hz).

Motormaster III Control —

Recommended mounting location is beneath the control box, mounted to the partition that separates the control box section from the indoor section.

NOTE: If unit power is supplied through the roof curb and basepan of the unit, mount the Motormaster III control on the corner post adjacent to the conduit running from the basepan to the bottom of the control box.

Step 10 — Install Humidistat for Optional MoistureMiser Dehumidification Package —

MositureMiser dehumidification package operation can be controlled by field installation of a Carrier-approved humidistat. To i nstall the humidistat perform the following procedure:

1. Locate humidistat o n a solid interior wall in the conditioned space. Location should be a well ventilated area to sense average humidity .

2. Route the rmostat cable or equivalent single leads of colored wire from Humidistat terminals through conduit in unit to the low voltage connection on the 2-pole terminal strip (TB3) as shown in Fig. 28 and Fig. 29.

Page 17

SENSOR

SENSOR LOCATION

HAIRPIN END

SENSOR LOCATION

HAIRPIN END

LOCATION

SENSOR LOCATION

HAIRPIN END

50TJ016 50TJ020

NOTE: All sensors are located on the eighth hairpin up from the bottom.

Fig. 26 — Motormaster® I Sensor Locations

50TJ024 50TJ028

NOTE: All sensors are located on the eighth hairpin up from the bottom.

Fig. 27 — Motormaster III Sensor Locations

LEGEND

LLSV — LPS — TB — TRAN —

Liquid Line Solenoid Valve Low Pressure Switch Terminal Block Transformer

Fig. 28 — Typical MoistureMiser Dehumidification Package

Humidistat Wiring Schematic (460V Unit Shown)

Page 18

Fig. 29 — Typical MoistureMiser Dehumidification

Package Control Box

START-UP

Use the following information and Start-Up Checklist on

page CL-1 to check out unit PRIOR to start-up.

Unit Preparation —

Check that unit has been installed in accordance with these installation instructions and all applicable codes.

Internal Wiring —

Check all electrical connections in

unit control boxes; tighten as required.

Crankcase Heater (Size 028 and Units with MoistureMiser Dehumidification Package Only) —

and compressor is not operating.

IMPORTANT : Unit power must be on for 24 hours prior to start-up. Otherwise, damage to compressor may result.

Compressor Mounting —

spring mounted. Do not loosen or remove compressor holddown bolts.

Refrigerant Service Ports —

tem has a total of 3 Schrader-type service gage ports. One port is located on the suction line, one on the compressor line, and one on the liquid line. In addition Schrader-type valves are located underneath the low-pressure switches. Be sure that caps on the ports are tight.

Compressor Rotation —

the compressors are rotating in the proper direction. To determine whether or not compressors are rotating in the proper direction:

Heater is energized as long as there is power to unit

Compressors are internally

Each refrigerant sys-

discharge

It is important to be certain

1. Connect service gages to suction and discharge pressure fittings.

2. Energize the compressor.

3. The suct ion pressure should drop and th e discharge pressure should rise, as is normal on any start-up.

If the suction pressure does not drop and the discharge pres-

sure does not rise to normal levels:

1. Not e that the evaporator fan is probably also rotating in the wrong direction.

2. Turn off power to the unit.

3. Reverse any two of the incoming power leads.

4. Turn on power to the compressor.

The suction and discharge pressure levels should now move

to their normal start-up levels. NOTE: When compressors are rotating in the wrong direction,

the unit will have increased noise levels and will not provide heating and cooling.

After a few minutes of reverse operation, the scroll compressor internal overload protection will open, which will activate the unit’s lockout and requires a manual reset. Reset is accomplished by turning the thermostat on and off.

Evaporator Fan —

Fan belt and variable pulleys are factory installed. Remove tape from the fan pulley. See Table 7 for Air Quantity Limits. See Tables 8-10 for Fan Performance data. Be sure that fans rotate in the proper direction. See Tables 11-13 for Static Pressure information for accessories and options. See Table 14 for fan rpm at various fan motor pulley settings. To alter fan performance, see Evaporator-Fan Performance Adjustment section, page 25.

Table 7 — Air Quantity Limits

UNIT 50TJ

016 020 024 028

Condenser Fans and Motors —

MINIMUM CFM MAXIMUM CFM

4500 7,500 5400 9,000 6000 10,000 7000 11,250

Fans and motors are factory set. Refer to Condenser-Fan Adjustment section (page 26) as required.

Return-Air Filters —

Check that correct filters are installed in filter tracks. See Table 1. Do not operate unit without return-air filters.

Outdoor-Air Inlet Screens —

Outdoor-air i nlet scr eens

must be in place before operating unit.

Accessory EconoMi$er Adjustment —

Remove filter access panel. Check that outdoor-air damper blades are closed and return-air damper blades are open.

EconoMi$er operation and adjustment is described in Base Unit Operation and EconoMi$er Adjustment sections (pages 23 and 27), respectively.

Page 19

Table 8 — Fan Performance — 50TJ016

50TJ016 (15 TONS)*

Airflow

(Cfm)

4500 4800 5100 5400 5700 6000 6300 6600 6900 7200 7500

50TJ016 (15 TONS)* (cont)

Airflow

(Cfm)

4500 4800 5100 5400 5700 6000 6300 6600 6900 7200 7500

LEGEND

Bhp — FIOP — Watts —

*Standard low-medium static drive range is 891 to 1179 rpm (for

208/230, 380 and 460 v units) or 1159 to 1429 rpm (for 575-v units). Alternate high-static drive range is 1227 to 1550 (for 208/ 230, 380, and 460 v units). The alternate high-static drive is not available for 50TJ016 575-v units. Other rpms require a field-supplied drive.

NOTES:

1. Maximum continuous bhp is 4.25 (208/230, 380 and 460 v) or

1016 3.99 3443 1087 4.25 3669 —— — —— — —— — —— —

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

1214 2.59 2230 1285 2.82 2430 1353 3.05 2633 1386 3.17 2736 1418 3.29 2839 1228 2.80 2417 1297 3.04 2619 1364 3.27 2825 1396 3.40 2928 1428 3.52 3033 1243 3.04 2618 1311 3.27 2823 1376 3.51 3031 1408 3.64 3136 1439 3.76 3242 1259 3.29 2835 1326 3.53 3043 1390 3.77 3254 1421 3.90 3360 1452 4.02 3467 1277 3.56 3067 1342 3.80 3278 1405 4.05 3492 1435 4.17 3600 1466 4.30 3708 1295 3.84 3316 1359 4.09 3530 1421 4.34 3746 —— — —— — 1315 4.15 3580 —— — —— — —— — —— —

Brake Horsepower Factory-Installed Option Input Watts to Motor

3.45 (575 v) and the maximum continuous watts are 3775 (208/ 230, 380, and 460 v) or 3065 (575 v). Do not adjust motor rpm such that motor maximum bhp and/or watts is exceeded at the maximum operating cfm.

0.2 0.4 0.6 0.8 1.0 1.2

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

684 1.28 1102 791 1.49 1283 887 1.70 1466 977 1.92 1652 1061 2.13 1841 1139 2.36 2034 715 1.47 1265 817 1.68 1451 910 1.90 1638 997 2.12 1828 1078 2.34 2021 1155 2.57 2217 747 1.67 1442 844 1.89 1633 934 2.12 1825 1018 2.34 2019 1097 2.57 2216 1171 2.80 2416 779 1.90 1635 872 2.12 1831 959 2.35 2027 1040 2.58 2226 1117 2.81 2426 1189 3.05 2629 812 2.14 1844 901 2.37 2044 985 2.60 2245 1063 2.84 2448 1138 3.07 2652 1209 3.31 2858 845 2.40 2068 931 2.64 2273 1011 2.87 2478 1087 3.11 2685 1160 3.35 2893 1229 3.60 3103 878 2.68 2309 961 2.92 2518 1039 3.16 2728 1112 3.41 2939 1183 3.65 3151 1250 3.90 3365 912 2.98 2566 992 3.22 2780 1067 3.47 2994 1138 3.72 3209 1207 3.97 3425 1273 4.22 3642 946 3.29 2841 1023 3.55 3059 1096 3.80 3277 1165 4.05 3496 1232 4.31 3716 —— — 981 3.63 3133 1055 3.89 3355 1125 4.15 3578 —— — —— — —— —

Available External Static Pressure (in. wg)

1.4 1.6 1.8 1.9 2.0

—— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— — —— —

Available External Static Pressure (in. wg)

2. Static pressure losses (i.e., EconoMi$er) must be added to external static pressure before entering Fan Performance table.

3. Interpolation is permissible. Do not extrapolate.

4. Fan performance is based on wet coils, clean filters, and casing losses. See Table 11 for accessory/FIOP static pressure information.

5. Extensive motor and drive testing on these units ensures that the full horsepower and watts range of the motor can be utilized with confidence. Using your fan motors up to the watts or bhp rating shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.

6. Use of a field-supplied motor may affect wiring size. Contact your Carrier representative for details.

Page 20

Table 9 — Fan Performance — 50TJ020 and 024

50TJ020, 024 (18 and 20 TONS)*

Airflow

(Cfm)

5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500

10,000

50TJ020, 024 (18 and 20 TONS)* (cont)

Airflow

(Cfm)

5,500 6,000 6,500 7,000 7,500 8,000 8,500 9,000 9,500

10,000

LEGEND

Bhp — FIOP — Watts —

*Standard low-medium static drive range for the 020 size is 910 to

1095 rpm. Standard low-medium static drive range for the 024 size is 1002 to 1225 rpm. Alternate high-static drive range for the 020 size is 1069 to 1287. Alternate high-static drive range for the 024 size is 1193 to 1458 rpm. Other rpms require a field-supplied drive.

NOTES:

1. Maximum continuous bhp for the 020 size is 5.90. Maximum

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

1030 5.73 4817 1082 6.06 5098 1131 6.40 5382 1180 6.74 5671 1227 7.09 5964 1272 7.44 6260 1082 6.46 5433 1131 6.80 5718 1178 7.14 6007 1225 7.49 6299 1270 7.84 6595 1313 8.20 6895 1134 7.25 6093 1180 7.59 6382 1226 7.94 6675 1270 8.29 6971 1313 8.65 7271 1356 9.01 7574

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

1086 3.89 3275 1142 4.24 3567 1197 4.59 3864 1223 4.77 4015 1249 4.96 4167 1112 4.31 3623 1167 4.66 3915 1219 5.01 4213 1245 5.19 4364 1270 5.37 4516 1142 4.77 4010 1194 5.12 4304 1245 5.47 4602 1270 5.65 4754 1294 5.83 4906 1173 5.28 4438 1224 5.63 4733 1273 5.98 5033 1296 6.17 5184 1320 6.35 5337 1207 5.83 4906 1255 6.19 5203 1302 6.55 5504 1326 6.73 5657 1348 6.91 5810 1242 6.44 5415 1289 6.80 5714 1334 7.16 6018 1357 7.34 6171 1379 7.52 6325 1279 7.10 5966 1324 7.45 6268 1368 7.82 6573 1389 8.00 6728 1411 8.18 6883 1317 7.80 6561 1360 8.16 6865 1403 8.53 7173 1424 8.71 7328 1445 8.90 7484 1356 8.56 7198 1398 8.93 7505 1440 9.29 7815 1460 9.48 7972 1480 9.67 8129 1397 9.37 7881 1438 9.74 8190 1477 10.11 8503 —— — —— —

Brake Horsepower Factory-Installed Option Input Watts to Motor

continuous bhp for the 024 size is 8.7 (208/230, 575 v) or 9.5 (380, 460 v). The maximum continuous watts for the 020 size is

5180. The maximum continuous watts for the 024 size is 7915

0.2 0.4 0.6 0.8 1.0 1.2

682 1.99 1675 760 2.29 1922 832 2.59 2177 901 2.90 2441 965 3.22 2712 1027 3.56 2990 730 2.38 2005 802 2.68 2257 871 2.99 2516 935 3.31 2783 997 3.63 3057 1056 3.97 3337 778 2.82 2373 846 3.13 2630 911 3.44 2893 972 3.76 3164 1031 4.09 3440 1087 4.43 3722 828 3.31 2780 892 3.62 3042 953 3.94 3310 1011 4.26 3583 1067 4.59 3863 1121 4.93 4148 878 3.84 3227 938 4.15 3494 996 4.48 3766 1051 4.81 4043 1105 5.14 4326 1156 5.49 4613 928 4.42 3715 985 4.74 3986 1040 5.07 4263 1093 5.40 4544 1144 5.74 4830 1194 6.09 5120 979 5.05 4245 1033 5.38 4521 1085 5.71 4801 1136 6.05 5086 1185 6.39 5375 1232 6.74 5669

Available External Static Pressure (in. wg)

1.4 1.6 1.8 1.9 2.0

Available External Static Pressure (in. wg)

(208/230, 575 v) or 8640 (380, 460 v). Do not adjust motor rpm such that motor maximum bhp and/or watts is exceeded at the maximum operating cfm.

2. Static pressure losses (i.e., EconoMi$er) must be added to external static pressure before entering Fan Performance table.

3. Interpolation is permissible. Do not extrapolate.

4. Fan performance is based on wet coils, clean filters, and casing losses. See Table 12 for accessory/FIOP static pressure information.

6. Use of a field-supplied motor may affect wiring size. Contact your Carrier representative for details.

Page 21

Table 10 — Fan Performance — 50TJ028

50TJ028 (25 TONS)*

Airflow

(Cfm)

7,000 7,500 8,000 8,500 9,000

9,500 10,000 10,500 11,000 11,250

50TJ028 (25 TONS)* (cont)

Airflow

(Cfm)

7,000 7,500 8,000 8,500 9,000

9,500 10,000 10,500 11,000 11,250

LEGEND

Bhp — FIOP — Watts —

*Standard low-medium static drive range is 1066 to 1283 rpm. Alter-

nate high-static drive range is 1332 to 1550. Other rpms require a field-supplied drive.

NOTES:

1. Maximum continuous bhp is 10.2 (208/230, 575 v) or 11.8 (380, 460 v) and the maximum continuous watts are 9510 (208/230, 575 v) or 11,000 (380, 460 v). Do not adjust motor rpm such that motor maximum bhp and/or watts is exceeded at the maximum operating cfm.

0.2 0.4 0.6 0.8 1.0 1.2

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

845 3.26 2693 909 3.60 2979 969 3.96 3272 1028 4.32 3574 1083 4.70 3883 1137 5.08 4,200 896 3.82 3156 956 4.17 3450 1014 4.54 3752 1069 4.91 4060 1123 5.29 4375 1174 5.68 4,698

948 4.43 3667 1005 4.80 3969 1060 5.17 4278 1112 5.56 4593 1163 5.94 4915 1213 6.34 5,243 1001 5.11 4226 1054 5.49 4537 1106 5.87 4853 1156 6.26 5175 1205 6.66 5504 1253 7.06 5,838 1053 5.85 4836 1104 6.23 5155 1154 6.63 5478 1202 7.02 5808 1248 7.43 6142 1294 7.84 6,483 1106 6.65 5498 1155 7.04 5824 1202 7.44 6155 1248 7.85 6492 1293 8.26 6833 1336 8.68 7,179 1159 7.52 6214 1206 7.92 6547 1251 8.33 6886 1295 8.74 7229 1338 9.16 7577 1380 9.59 7,929 1213 8.45 6984 1257 8.86 7325 1300 9.28 7671 1342 9.70 8020 1384 10.13 8375 1424 10.56 8,733 1266 9.45 7810 1309 9.87 8159 1350 10.29 8511 1391 10.73 8868 1431 11.16 9229 1470 11.60 9,594 1293 9.97 8245 1334 10.40 8597 1375 10.83 8953 1415 11.26 9313 1454 11.70 9677 1493 12.15 10,045

Available External Static Pressure (in. wg)

1.4 1.6 1.8

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

1189 5.47 4,524 1239 5.87 4,854 1288 4.91 5191 1224 6.08 5,026 1272 6.48 5,362 1320 5.56 5703 1261 6.75 5,577 1307 7.16 5,917 1353 6.26 6263 1299 7.47 6,177 1344 7.89 6,523 1388 7.02 6873 1338 8.26 6,828 1382 8.68 7,179 1424 7.85 7534 1379 9.11 7,530 1421 9.54 7,887 1462 8.74 8247 1421 10.02 8,286 1461 10.46 8,648 1501 9.70 9014 1464 11.00 9,096 1503 11.45 9,464 1541 10.73 9835 1508 12.05 9,963 1546 12.50 10,336 —— — 1530 12.60 10,417 —— ————

Brake Horsepower Factory-Installed Option Input Watts to Motor

Available External Static Pressure (in. wg)

2. Static pressure losses (i.e., EconoMi$er) must be added to external static pressure before entering Fan Performance table.

3. Interpolation is permissible. Do not extrapolate.

4. Fan performance is based on wet coils, clean filters, and casing losses. See Table 12 for accessory/FIOP static pressure information.

6. Use of a field-supplied motor may affect wiring size. Contact your Carrier representative for details.

Page 22

Table 11 — Accessory/FIOP Static Pressure (in. wg) — 50TJ016

COMPONENT

EconoMi$er Glycol Coil

4500 5000 6000 7200 7500

0.04 0.05 0.07 0.09 0.10

0.22 0.26 0.35 0.44 0.46

Electric Heat (kW) 20 26/34 32 35 42/56 50 55 56/75 80

0.06 0.07 0.09 0.11 0.12

0.07 0.08 0.12 0.15 0.17

0.07 0.08 0.12 0.16 0.17

0.09 0.10 0.15 0.20 0.21

0.07 0.08 0.12 0.15 0.17

0.09 0.10 0.15 0.20 0.21

LEGEND NOTES:

FIOP —

Factory-Installed Option

1. The static pressure must be added to external static pressure. The sum and the evaporator entering-air cfm should then be used in conjunction with the Fan Performance tables to determine blower rpm and watts.

2. Heaters are rated at 240 v, 380 v, 480 v, and 600 v.

Table 12 — Accessory/FIOP Static Pressure (in. wg) — 50TJ020-028

COMPONENT

EconoMi$er Glycol Coil Electric Heat (kW)

20, 26/34 32 35, 42/56 55 56/75 80

LEGEND

FIOP —

Factory-Installed Option

5400 6000 7200 9000 10,000 11,250

0.06 0.07 0.09 0.11 0.12 0.14

0.30 0.35 0.44 0.58 0.66 0.77

0.08 0.09 0.11 0.15 0.17 0.20

0.11 0.12 0.15 0.19 0.21 0.24

0.14 0.15 0.20 0.24 0.26 0.29

NOTES:

2. Heaters are rated at 240 v, 380 v, and 480 v. There are no 575-v heaters.

CFM

Table 13 — MoistureMiser Dehumidification

Package Static Pressure Drop (in. wg)

UNIT SIZE

50TJ

016 020 024 028

UNIT NOMINAL

TONS

15 .040 .071 .111 18 .058 .102 .160 20 .071 .126 .197 25 .111 .197 .308

CFM PER TON

300 400 500

Table 14 — Fan Rpm at Motor Pulley Settings*

UNIT 50TJ

016 (208/230, 380, 460 v)†

016 (208/230, 380, 460 v)**

016 (575 v)†

020† 020** 024† 024** 028† 028**

*Approximate fan rpm shown.

†Indicates standard drive package.

**Indicates alternate drive package.

††Due to belt and pulley size, pulley cannot be set to this number of

turns open.

†† †† 1179 1150 1121 1093 1064 1035 1006 978 949 920 891 †† †† 1559 1522 1488 1455 1422 1389 1356 1323 1289 1256 1227 †† †† 1429 1403 1376 1349 1323 1296 1269 1242 1215 1188 1159 †† †† 1095 1077 1058 1040 1021 1002 984 965 947 928 910 †† †† 1287 1265 1243 1222 1200 1178 1156 1134 1112 1091 1069 †† †† 1225 1209 1187 1165 1143 1120 1098 1076 1053 1031 1002 †† †† 1458 1434 1407 1381 1354 1328 1301 1275 1248 1222 1193 †† †† 1283 1269 1247 1225 1203 1182 1160 1138 1116 1095 1066 †† †† — — 1551 1524 1497 1470 1443 1415 1388 1361 1332

MOTOR PULLEY TURNS OPEN

Page 23

Base Unit Operation

COOLING, UNITS WITHOUT ECONOMI$ER — When thermostat calls for cooling, terminals G and Y1 are energized. The indoor (evaporator) fan contactor (IFC), and compressor contactor no. 1 (C1) are energized and evaporator-fan m otor, compressor no. 1 and condenser fans start. The condenser-f an motors run continuously while unit is cooling. If the thermostat calls for a second stage of cooling by energizing Y2, compressor contactor no. 2 (C2) is energized and compressor no. 2 starts.

HEATING, UNITS WITHOUT ECONOMI$ER (If Accessory or Optional Heater is Installed) — Upon a call for heating through terminal W1, IFC and heater contactor no. 1 (HC1) are energized. On units equipped for 2 stages of heat, when additional heat is needed, HC2 is energized through W2.

COOLING UNITS WITH ECONOMI$ER — When the OAT is above the ECON SP set point and the room thermostat calls for Stage 1 cooling (R to G + Y1), th e indoor-fan m otors (IFM) is energized and the EconoMi$er dampe r modulates to minimum position. The compressor contactor and OFC are energized to start the compressor and outdoor-fan motor (OFM). After the thermostat is satisfied, the damper modulates to the fully closed position when the IFM is deenergized.

When the OAT is below the ECON SP setting and the room thermostat calls for Stage 1 cooling (R to G + Y1), the EconoMi$er modulates to the minimum position when the IFM is energized. The EconoMi$er provides Stage 1 of cooling by modulating the return and outdoor air dampers to maintain a 55 F supply air set point. If the supply-air temperature (SAT) is greater than 57 F, the EconoMi$er modulates open, allowing a greater amount of outdoor air to enter the unit. If the SA T drops below 53 F, the outdoor air damper modulates closed to reduce the amount of outdoor air. When the SAT is bet ween 53 and 57 F , the EconoMi$er maintains its position.

If outdoor air alone cannot satisfy the cooling requirements of the conditioned space, and the OAT is above the MECH CLG LOCKOUT set point, the EconoMi$er integrates free cooling with mechanical cooling. This is accomplished by the strategies below.

NOTE: Compressors have a two-minute Minimum On and Minimum Off, which are accomplished by the strategies below.

1. If Y1 is energized, and the room thermostat calls for Y2 (2-stage thermostat), the compressor and OFC are energized. The position of the EconoMi$er damper is maintained at its current value.

2. If Y1 is energized for more than 20 minutes, and Y2 is not energized (whether or not a 2-stage thermostat is used), the compressor and OFC are energized. The position of the EconoMi$er damper is maintained at its current value.

3. If Y 1 is energized, and com pressor no. 1 i s al ready ene rgized (see Step 2) and the room thermostat calls for Y2, compressor no. 1 continues to operate. If Y2 remains energized for more than 20 minutes, compressor no. 2 is energized.

NOTE: Compressor no. 2 cannot be energized unless there is a signal for Y2 from the space thermostat.

4. If c ompressor no. 2 is ene rgized, and the Y2 signal from the thermostat is satisfied, compressors 1 and 2 are deenergized. Re-asserting Y2 will start compressor no. 1 and (after a 20-minute interstage delay) compressor no. 2.

5. If compressor no. 1 is energized and the thermostat is satisfied, compressor no. 1, the OFM, and IFM are deenergized and the EconoMi$er modulates closed.

When the OAT is below the MECH CLG LOCKOUT set

point, the compressors remain off.

FREEZE PROTECTION THERMOSTAT(S) — A freeze protection thermostat (FPT) is located on the top and bottom of the evaporator coil. It detects frost build-up and turns off the compressor, allowing the coil to clear. Once frost has melted, the compressor can be reenergized by resetting the compressor lockout.

HEATING, UNITS WITH ECONOMI$ER (If Accessory or Optional Heater is Installed) — When the room thermostat calls for heat, the heating controls are energized as described in the Heating, Units Without EconoMi$er section. The IFM is energized and the EconoMi$er damper modulates to the minimum position. When the thermostat is satisfied, the damper modulates closed.

UNITS WITH MOISTUREMISER DEHUMIDIFICATION PACKAGE — When thermostat calls for cooling, terminals G and Y1 and/or Y2 and the compressor contactor C1 and/or C2 are energized. The indoor (evaporator) fan motor (IFM), compressors, and outdoor (condenser) fan motors (OFM) start. The OFMs run continuously while the unit is in cooling. As shipped from the factory, both MoistureMiser dehumidification circuits are always energized.

If MoistureMiser circuit modulation is desired, a fieldinstalled, wall-mounted humidistat is required. If the MoistureMiser humidistat is installed and calls for the MoistureMiser subcooler coil to operate, the humidistat internal switch closes. This energizes the 3-way liquid line solenoid valve coils (LLSV1 for circuit 1 and LLSV2 for circuit 2) of the MoistureMiser circuits, forcing the warm liquid refrigerant of the liquid line to enter the subcooler coils. See Fig. 30.

As the warm liquid passes through the subcooler coils, it is exposed to the cold supply airflow coming off the evaporator coils and the liquid is further cooled to a temperature approaching the evaporator coil leaving-air temperature. The state of the refrigerant leaving the subcooler coils is a highly subcooled liquid refrigerant. The liquid then enters a thermostatic expansion valve (TXV) where the liquid is dropped to the evaporator pressure. The TXVs can throttle the pressure drop of the liquid refrigerant and maintain proper conditions at the compressor suction valves over a wide range of operating conditions. T he liquid proceeds to the evaporator coil s at a temperature lower than normal cooling operation. This lower temperature is what increases the latent and sensible capacity of the evaporator coils.

The 2-phase refrigerant passes through the evaporators and is changed into a vapor. The air passing over the evaporator coils will become colder than during normal operation as a r esult of the colder refrigerant temperatures. However, as it passes over the subcooler coils, t he a ir wi ll be warm ed, de crea sing the sensible capacity and reducing the sensible heat of the rooftop unit.

As the refrigerant leaves the evaporator, the refrigerant passes a subcooler control low-pressure switch (S-LPS1 for circuit 1 or S-LPS2 for circuit 2) in the suction line. This lowpressure switch will deactivate the MoistureMiser package when the suction pressure reaches 60 psig. The subcooler control low-pressure switch is an added safety device to protect against evaporator coil freeze-up during low ambient operation. The subcooler control low-pressure switch will only deactivate the 3-way liquid line solenoid valve in the M oistureMiser circuit. The compressors will continue to run as long as there is a call for cooling, regardless of the position of the subcooler control low-pressure switch. The 3-way solenoid valve and the MoistureMiser package will be re activated only when the call for cooling has been satisfied, the subcooler control low-pressure switch has closed above 80 psig, and a new call for cooling exists. The crankcase heaters on the scroll compressors provide additional protection for the compressors due to the additional refrigerant charge in the subcooler.

Page 24

Fig. 30 — MoistureMiser Operation Diagram

When the humidistat is satisfied, the humidistat internal switch opens, cutting power to and deenergizing the LLSVs. The refrigerant is routed back through the evapora tors and the sub-cooler coils are removed from the refrigerant loops. When the thermostat is satisfied, C1 and C2 are deenergized and t he compressors, IFM, and OFMs shut off. If the thermostat fan selector switch is in the ON position, the IFM will run continuously .

SERVICE

Before performing service or maintenance operations on unit, turn off main power switch to unit. Turn off accessory heater power switch if applicable. Electrical shock could cause personal injury.

Cleaning —

ing and cooling season and as operating conditions require. Remove unit top panel and/or side panels for access to unit interior.

EVAPORATOR COIL — Clean as required with a commercial coil cleaner.

NOTE: The 50TJ028 unit has a mist eliminator screen attached to the evaporator coil to prevent condensate runoff at high wetbulb conditions. Check periodically and clean as necessary.

Inspect unit interior at beginning of each heat-

CONDENSER COIL — Clean condenser coil annually and as required by location and outdoor-air conditions. Inspect coil monthly — clean as required.

CONDENSATE DRAIN — Check and clean each year at start of cooling season.

FILTERS — Clean or replace at start of each heating and cooling season, or more often if operating conditions require. Refer to Ta ble 1 for type and size.

NOTE: The 50TJ028 unit requires industrial grade throwaway filters capable of withstanding face velocities up to 625 fpm. Ensure that replacement filters for the 50TJ028 units are rated for 625 fpm.

OUTDOOR-AIR INLET SCREENS — Clean screens with steam or hot water and a mild detergent. Do not use throwaway filters in place of screens.

Lubrication

COMPRESSORS — Each compressor is charged with the correct amount of oil at the factory. Conventional white oil (Sontext 200LT) is used. White oil is compatible with 3GS oil, and 3GS oil may be used if the addition of oil is required. See compressor nameplate for original oil charge. A complete recharge should be four ounces less than the original oil charge. When a compressor is excha nged in the field it is possible that a major portion of the oil from the replaced compressor may still be in the system . Whil e this wi ll no t af fe ct th e rel iabi lity of the replacement compressor, the extra oil will add rot or drag and increase power usage. To remove this excess oil, an access valve may be added to the lower portion of the suction line at

Page 25

the inlet of the compressor. The compressor should then be run

Fig. 31 — Evaporator-Fan Pulley Alignment

and Adjustment

for 10 minutes, shut down, and the access valve opened until no oil flows. This should be repeated twice to make sure the proper oil level has been achieved.

FAN SHAFT BEARINGS — For size 016 units , bearings are permanently lubricated. No field lubrication is required. For size 020-028 units, the bearings are of the pillow block type and have grease fittings. The bearing opposite the motor end has an extended tube line so it can be lubricated from the motor side. Lubricate the bearings twice annually.

T ypical lubricants are given below:

MANUFACTURER LUBRICANT

Texaco

Mobil

Sunoco

Texaco

*Preferred lubricant because it contains rust and oxidation inhibitors.

Regal AFB-2*

Mobilplex EP No. 1

Prestige 42

Multifak 2

CONDENSER AND EVAPORATOR-FAN MOTOR BEARINGS — The condenser and evaporator-fan motors have permanently-sealed bearings, so no field lubrication is necessary.

Evaporator Fan Performance Adjustment (Fig. 31-33) —

shown in T able 1. T o change fan speeds:

1. Shut off unit power supply.

2. a. Size 016 Only: Loosen belt by loosening fan motor mounting plate nuts.

b. Size 020-028 Only: Loosen nuts on the 2 carriage

bolts in the motor mounting base. Install jacking bolt and plate under motor base (bolt and plate are shipped in installer’s packet). See Fig. 33. Using bolt and plate, raise motor to top of slide and remove belt. Secure motor in th is pos i ti on by tig ht ening the nuts on the carriage bolts.

3. Loosen movable-pulley flange setscrew (see Fig. 31).

4. Screw movable flange toward fixed flange to increase

speed and away from fixed flange to decrease speed. Increasing fan speed increases load on motor. Do not exceed maximum speed specified in Table 1.

See Tabl e 7 for air quantity limits.

5. Set movable flange at ne arest keyway of pulley hub and

tighten setscrew. (See Table 1 for speed change for each full turn of pulley flange.)

6. Repla ce and tighten belts. See Belt Tension Adjustment

section on page 26.

T o align fan and motor pulleys:

1. Loosen fan pulley setscrews.

2. Slide fan pulley along fan shaft.

3. Make angular alignment by loosening motor from

mounting plate.

Fan motor pulleys are factory set for speed

Evaporator Fan Service and Replacement

50TJ016 UNITS (See Fig. 32) NOTE: To remove belts only, follow Steps 1-6.

1. Remove filter and supply-air section panels.

2. Remove unit top panel.

3. Loosen c arriage nuts A and B holding motor mount as-

sembly to fan scroll side plates.

4. Loosen screw C.

5. Rotate m otor mount assembly (with motor attached) as

far as possible away from evaporator coil.

6. Remove belt.

7. Rotate motor mount assembly back past original position toward evaporator coil.

8. Remove motor mounting nuts D and E (both sides).

9. Lift motor up through top of unit.

10. Reverse above procedure to reinstall motor.

11. Check and adjust belt tension as necessary.

50T J 020 -0 2 8 U NI TS (S ee Fi g. 33 ) — The 50TJ020-028 units use a fan motor mounting system that features a slide-out motor mounting plate. To replace or service the motor, slide out the brack et.

1. Remove t he evaporator-fan access panel and the heating control access panel.

2. Remove the center post (located betwe en the evaporator fan and heating control access panels) and all screws securing it.

3. Loosen nuts on the two carriage bolts in the motor mounting base.

4. Using jacking bolt under motor base, raise motor to top of slide and remove belt. Secure motor in this position by tightening the nuts on the carriage bolts.

5. Remove the belt drive.

6. Remove jacking bolt and tapped jacking bolt plate.

7. Remove the 2 screws that secure the motor mounting plate to the motor support channel.

8. Remove the 3 screws from the end of the motor support channel that interfere with the motor slide path.

9. Slide out the motor and motor mounting plate.

10. Disconnect wiring c onnections a nd remove the 4 mount ing bolts.

11. Remove the motor.

12. To install the new motor, reverse Steps 1-11.

Page 26

4. Tighten setscrews and replace rubber hubcap to prevent

NOTE: A 31/2-in. bolt and threaded plate are included in the installer’s packet. They should be added to the motor support channel below the motor mounting plate to aid in raising the motor. The plate part number is 50DP503842. The adjustment bolt is

/8-16 x

/4 in.-LG.

Fig. 33 — 50TJ020-028 Evaporator-Fan

Motor Section

NOTE: Dimensions are in inches.

Fig. 35 — Condenser-Fan Adjustment,

50TJ024,028

NOTE: Dimensions are in inches).

Fig. 34 — Condenser-Fan Adjustment,

50TJ016,020

hub from rusting to motor shaft.

5. Fill hub recess with permagum if rubber hubcap is missing.

Belt Tension Adjustment —

1. Loosen fan motor bolts.

2. Adjust belt tension:

Fig. 32 — 50TJ016 Evaporator-Fan

Motor Section

To adj ust belt tension:

a. Size 016 Units: Move motor mounting plate up or

down for proper belt tension (

/2 in. deflection with

one finger).

b. Size 020-028 Units: Turn motor jacking bolt to move

motor mounting plate up or down for proper belt ten-

sion (

/8 in. deflection at midspan with one finger [9

lb force]).

3. Tighten nuts.

4. Adjust bolts and nut on mounting plate to secure motor in fixed position.

Condenser-Fan Adjustment

50TJ016,020 UNITS (Fig. 34)

1. Shut off unit power supply.

2. Remove access panel(s) closest to the fan to be adjusted.

3. Loosen fan hub setscrews.

4. Adjust fan height on shaft using a straightedge placed across the fan orifice.

5. Tighten setscrews and replace panel(s).

6. Turn on unit power.

50TJ024,028 UNITS (Fig. 35)

1. Shut off unit power supply.

2. Remove fan top-grille assembly and loosen fan hub screws.

3. Adjust fan height on unit, using a straightedge placed across the fan orifice.

Page 27

EconoMi$er Adjustment

LED INDI CATI ON — The EconoMi$er controller features an onboard diagnostic LED (light-emitting diode) that flashes to indicate its status. See Table 15 for flash codes. The controller also has terminal connections (REM LED) for remotely mounting an LED, if desired. The flash code priorities are as follows:

1. On/Off or continuous flash

2. Critical fault

3. Non-critical fault If any sensors are opened, shorted, or removed, the

EconoMi$er determines whether the failure is critical or noncritical and flashes the appropriate code. If a non-critical sensor fault occurs (i.e., outdoor air humidity), the EconoMi$er auto matically reconfigures its control strategy to a more appropriate mode. If a critical sensor fault occurs (i.e., supply air sensor), the EconoMi$er reverts to a safe mode of operation until the sensor problem is resolved.

MANUAL CONFIGURATION PUSHBUTTON — The EconoMi$er controller also features an onboard button (CONFIG) to help troubleshoot the system. See Fig. 16. The button can perform 3 different functions.

Pressing the CONFIG button for more than three seconds,

but less than ten seconds and then releasing will start the automatic test procedure. The damper will modulate fully open, wait, and modulate closed. This process takes three minutes to complete. Use this feature to determine if the actuator can be commanded.

If the CONFIG button is pressed and held for ten seconds

and less than 30 seconds then released, the EconoMi$er controller reconfigures its mode of operation based on the sensors that are connected and functioning normally, and cancels the automatic test procedure.

If the EconoMi$er controller recognized a non-critical

sensor fault, and flashed a code (i.e., FLASH 6, outdoor air humidity sensor fault) the FLASH CODE will be cleared, and normal operation begins. Ensure faulty sensor is removed before clearing faults.

If the EconoMi$er controller recognizes a critical sensor

fault, and flashes a code (i.e., FLASH 4, discharge air thermostat fault) the FLASH code will not be cleared, and the EconoMi$er will remain in the safe operation mode. The

sensor fault must be corrected to enable EconoMi$er to revert to normal operation.

If the CONFIG button is pressed and held for more th an 30 seconds and released, the EconoMi$er controller will enable the enthalpy comparison strategy (with outdoor air enthalpy and return air enthalpy sensors installed).

Power Failure —

Dampers have a spring return. In event of power failure, dampers will return to fully closed position until power is restored.

Do not manually operate damper

motor.

Refrigerant Charge —

Amount of refrigerant charge is listed on unit nameplate and in Table 1. Refer to Carrier GT AC II; Module 5; Charging, Recovery, Recycling, and Reclamation section for charging methods and procedures. Unit panels must be in place when unit is operating during charging procedure.

NOTE: Do not use recycled refrigerant a s it may contain contaminants.

NO CHA RGE — Use standard evacuating techniques. After evacuating system, weigh in the specified amount of refrigerant (refer to Table 1).

LOW CHARGE COOLING — Using cooling charging chart (see Fig. 36), add or remove refrigerant until conditions of the chart are met. Note that charging chart is different from those normally used. An accurate pressure gage and temperaturesensing device is required. Charging is accomplished by ensuring the proper amount of liquid subcooling. Measure liquid line pressure at the liquid line service valve using pressure gage. Connect temperature sensing device to the liquid line near the liquid line service valve and insulate it so that outdoor ambient temperature does not affect reading.

TO USE THE COOLING CHARGING CHART — Use the above temperature and pressure readings, and find the intersection point on the cooling charging chart. If intersection point on chart is above line, add refrigerant. If intersection point on chart is below line, carefully recover some of t he charge. Recheck suction pressure as charge is adjusted. NOTE: Indoor-air CFM must be within normal operating range of unit. All outdoor fans must be operating.

The TXV (thermostatic expansion valve) is set to maintain between 15 and 20 degrees of superheat at the compressors. The valves are factory set and should not require re-adjustment.

Table 15 — EconoMi$er Control Module Flash Code Identification

FLASH CODE CAUSE ACTION TAKEN BY ECONOMI$ER

Constant On Constant Off Continuous

Flash Flash One Flash Two Flash Three

Flash Four

Critical Fault

Flash Five

Flash Six

Flash Seven

Flash Eight

Flash Nine

Non-Critical Fault

Flash Ten

Normal operation Normal operation. No power No operation. CONFIG button pushed and held

between 3 and 9 seconds Control board fault System shutdown. Thermostat fault (i.e., Y2 without Y1) System shutdown until corrected. Actuator fault Revert to mechanical cooling only.

Discharge air thermistor fault

Outdoor air temperature sensor fault

Outdoor air humidity sensor fault Continue operation with dry bulb or dry bulb differential switchover.

Return air temperature sensor fault

Return air humidity sensor fault

Carbon Dioxide (CO

Onboard adjustment potentiometer fault Continue operation with default potentiometer settings.

) sensor fault Continue operation without ventilation control.

Outdoor air damper is stroked fully open, then closed (automatic test procedure takes 3 minutes to complete).

Continue operation with damper at minimum position. Revert to mechanical cooling only.

Continue operation with damper at minimum position. Disable mechanical cooling lockout.

Continue operation with single enthalpy EconoMi$er switchover or dry bulb EconoMi$er switchover (without humidity sensor).

Continue operation with single enthalpy, differential dry bulb, or dry bulb EconoMi$er switchover.

Page 28

BOTH CIRCUITS

REDUCE CHARGE IF BELOW CURVE

150

200

250

300

350

400

140

120

100

LIQUID TEMPERATURE AT LIQUID VALVE (DEG F)

ALL OUTDOOR FANS MUST BE OPERATING

ADD CHARGE IF ABOVE CURVE

100

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

Fig. 36 — Cooling Charging Chart

MOISTUREMISER SYSTEM CHARGING — The system charge for units with the MoistureMiser option is greater than that of the standard unit alone. The charge for units wit h this option is indicated on the unit nameplate drawing. To charge systems using the MoistureMiser Dehumidification package, fully evacuate, recover, and re-charge the system to the nameplate specified charge level. To check or adjust refrigerant charge on systems using the MoistureMiser Dehumidification package, charge per the standard subcooling charts. The subcooler MUST be deenergized to use the charging charts. The charts reference a liquid pressure (psig) and temperature at a point between the condenser coil and the subcooler coil. A tap is provided on the unit to measure liquid pressure entering the subcooler (leaving the condenser).

Filter Drier —

Replace whenever refrigerant s ystem is ex-

posed to atmosphere.

Protective Devices

COMPRESSOR PROTECTION Overcurrent

protection, except the circuit no. 1 on the 50TJ028 unit. Compressor no. 1 on the 50TJ028 unit uses an electronic module located with the compressor junction box, to provide motor protection. This electronic module monitors winding and discharge temperatures. If these temperatures reach the trip values, the module interrupts the control line and causes the compressor to swit ch of f.

Crankcase Heater the optional MoistureMiser Dehumidification system are equipped with a 70-watt crankcase heater to prevent absorption of liquid refrigerant by oil in the crankcase when the compressor is idle. The crankcase heater is energized whenever there is a main power to the unit and the compressor is not energized.

IMPORTANT: After prolonged shutdown or servicing, energize the crankcase heaters for 24 hours before starting the compressors.

— Each compressor has internal line break motor

— Only the 50TJ028 unit and units with

Compressor Lockout

— If any of the safeties (high-pressure, low-pressure, freeze protection thermostat, compressor internal thermostat) trip, or if there is loss of power to the compr essors, the CLO (compressor lockout) will lock the compressors off. T o reset, manually move the thermostat setting.

EVAPORATOR FAN MOTOR PROTECTION — A manual reset, calibrated trip, magnetic circuit breaker protects against overcurrent. Do not bypass connections or increase the size of the breaker to correct trouble. Determine the cause and correct it before resetting the breaker.

CONDENSER-FAN MOTOR PROTECTION — Each condenser-fan motor is internally protected against overtemperature.

HIGH- AND LOW-PRESSURE SWIT CHES — If either switch trips, or if the compres sor overt emperatur e switch activates, that refrigerant circuit will be automatically locked out by the CLO. To reset, manually move the thermostat setting.

FREEZE PROTECTION THERMOSTAT (FPT) — An FPT is located on the top and bottom of the evaporator coil. It detects frost build-up and turns off the compressor, allowing the coil to clear. Once the frost has melted, the compressor can be reenergized.

Relief Devices —

All units have relief devices to protect against damage from excessive pressures (e.g., fire). These devices protect the high and low side.

Control Circuit, 24-V —

This control circuit is protected against overcurrent by a 3.2-amp circuit brea ker. Breaker can be reset. If it trips, determine cause of trouble before resetting.

Replacement Parts —

A complete list of replacement parts may be obtained from any Carrier distributor upon request.

EconoMi$er LEDs —

The EconoMi$er control module has an LED for diagnostic purposes. The flash code identification is shown in T able 15.

Optional Hinged Access Doors —

When the optional service package is ordered or the if the hinged access doors option is ordered, the unit will be provided with external and internal hinged access doors to facilitate service.

Four external hinged access doors are provided. All external

doors are provided with 2 large

/4 turn latches with folding bail-type handles. (Compressor access doors have one latch.) A single door is provided for filter and drive access. One door is provided for control box access. The control box access door is interlocked with the non-fused disconnect which must be in the OFF position to open the door. Two doors are provided for access to the compressor compartment.

Two internal access doors are provided inside the filter/ drive access door. The filter access door (on the left) is secured by 2 small

/4 turn latches with folding bail-type handles. This door must be opened prior to opening the drive access door. The drive access door is shipped with 2 sheet metal screws holding the door closed. Upon initial opening of the door, these screws may be removed and discarded. The door is then held shut by the filter access door, which closes over it.

Page 29

ELECTRIC HEAT

208/240 v Amps 200/230 v kW A B C

71.3/82.3 25.7/34.2 117/135 42.2/56.1 156/180 56.2/74.8

Fig. 37 — Typical Wiring Schematic (50TJ024, 208/230-3-60 Shown)

Page 30

Fig. 37 — Typical Wiring Schematic (50TJ024, 208/230-3-60 Shown) (cont)

Fig. 38 — Typical Component Arrangement (50TJ024 Shown)

Page 31

AHA — BRK W/AT — C — CB — CC — CH — CLO — COMP — CR — DAT — DM — DU — EC — EQUIP — FL — FLA — FPT — FU —

LEGEND AND NOTES FOR FIG. 37 AND 38

Adjustable Heat Anticipator Breaks with Amp Turns Contactor, Compressor Circuit Breaker Cooling Compensator Crankcase Heater Compressor Lockout Compressor Motor Control Relay Discharge Air Thermistor Damper Motor Dummy Terminal Enthalpy Control Equipment Fuse Link Full Load Amps Freeze Protection Thermostat Fuse

NOTES:

1. Compressor and fan motor(s) thermally protected; 3-phase motors protected against primary single-phasing conditions.

2. If any of the original wire furnished must be replaced, it must be replaced with type 90 C wire or its equivalent.

3. TRAN1 is wired for 230 v (60 Hz) or 220 v (50 Hz) operation. If unit is 208 v, disconnect the black wires from the ORN TRAN wire and reconnect to the RED TRAN wire, apply wirenuts to wires.

5. IFCB must trip amps is equal to or less than 140% FLA.

6. The CLO locks out the compressor to prevent short cycling on compressor overload and safety devices. Before replacing CLO, check these devices.

7. Jumpers are omitted when unit is equipped with EconoMi$er.

8. Number(s) indicates the line location of used contacts. A bracket over (2) numbers signifies a single-pole, double-throw contact. An underlined number signifies a normally closed contact. Plain (no line) number signifies a normally open contact.

GND — HC — HPS — HTR — IFC — IFCB — IFM — IFR — L — LOR — LPS — LS — NEC — OAT — OFC — OFM — OP — PL — PRI —

LEGEND

Ground Heater Contactor High-Pressure Switch Heater Indoor-Fan Contactor Indoor-Fan Circuit Breaker Indoor-Fan Motor Indoor-Fan Relay Light Lockout Relay Low-Pressure Switch Limit Switch National Electrical Code Outdoor-Air Thermostat Outdoor-Fan Contactor Outdoor-Fan Motor Overcurrent Protection Plug Assembly Primary

TB — TC — TH — TRAN —

Te r mi n al B lo c k Thermostat Cooling Thermostat Heating Transformer

Terminal (Marked)

Terminal (Unmarked)

Te r mi n al B lo c k

Splice

Fac tory W irin g Field Control Wiring Option/Accessory Wiring To indicate common potential

only; not to represent wiring.

Page 32

PROBLEM CAUSE REMEDY

Compressor and condenser fan will not start.

Compressor will not start but condenser fan runs.

Compressor cycles (other than normally satisfying thermostat).

Compressor operates continuously.

Excessive head pressure.

Head pressure too low.

Excessive suction pressure.

Suction pressure too low.

LEGEND

Thermostatic Expansion Valve

TXV —

TROUBLESHOOTING

Refer to Tables 16-18 for troubleshooting details.

Table 16 — Cooling Service Analysis

Power failure. Call power company. Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker. Defective thermostat, contactor, transformer, or control

relay. Insufficient line voltage. Determine cause and correct. Incorrect or faulty wiring. Check wiring diagram and rewire correctly. Thermostat setting too high. Lower thermostat setting below room temperature. Faulty wiring or loose connections in compressor circuit. Check wiring and repair or replace. Compressor motor burned out, seized, or internal over-

load open. Defective overload. Determine cause and replace. Compressor locked out Determine cause for safety trip and reset lockout. One leg of 3-phase power dead. Replace fuse or reset circuit breaker.

Refrigerant overcharge or undercharge. Recover refrigerant, evacuate system, and recharge

Defective compressor. Replace and determine cause. Insufficient line voltage. Determine cause and correct. Blocked condenser. Determine cause and correct. Defective overload. Determine cause and replace. Defective thermostat. Replace thermostat. Faulty condenser-fan motor. Replace. Restriction in refrigerant system. Locate restriction and remove. Dirty air filter. Replace filter. Unit undersized for load. Decrease load or increase unit size. Thermostat set too low. Reset thermostat. Low refrigerant charge. Locate leak, repair, and recharge. Air in system. Recover refrigerant, evacuate system, and recharge. Condenser coil dirty or restricted. Clean coil or remove restriction. Dirty air filter. Replace filter. Dirty condenser coil. Clean coil. Refrigerant overcharged. Recover excess refrigerant. Faulty TXV. 1. Check TXV bulb mounting and secure tightly to

Air in system. Recover refrigerant, evacuate system, and recharge. Condenser air restricted or air short-cycling. Determine cause and correct. Low refrigerant charge. Check for leaks, repair, and recharge. Restriction in liquid tube. Remove restriction. High heat load. Check for source and eliminate. Faulty TXV. 1. Check TXV bulb mounting and secure tightly to

Refrigerant overcharged. Recover excess refrigerant. Dirty air filter. Replace filter. Low refrigerant charge. Check for leaks, repair, and recharge. Metering device or low side restricted. Remove source of restriction. Faulty TXV. 1. Check TXV bulb mounting and secure tightly to

Insufficient evaporator airflow. Increase air quantity. Check filter and replace if

Temperature too low in conditioned area. Reset thermostat. Field-installed filter drier restricted. Replace.

Replace component.

Determine cause. Replace compressor.

Determine cause.

to nameplate.

suction line.

2. Replace TXV if stuck open or closed.

suction line.

2. Replace TXV if stuck open or closed.

suction line.

2. Replace TXV if stuck open or closed.

necessary.

Page 33

Table 17 — EconoMi$er Troubleshooting

PROBLEM POTENTIAL CAUSE REMEDY

Damper Does Not Open

EconoMi$er Operation Limited to Minimum Position

Damper Position Less than Minimum Position Set Poi nt

Damper Does Not Return to Minimum Position

Damper Does Not Close on Power Loss

LEGEND

IFM — PL —

Indoor Fan Motor Plug

Indoor (Evaporator) Fan is Off

No Power to EconoMi$er Controller

No Power to G Terminal If IFM is on, check to ensure 24 vac is present on G Terminal of the

Controller Fault If STATUS light is flashing one flash, the EconoMi$er controller is

Thermostat Fault If STATUS light is flashing two flashes, the EconoMi$er controller senses that

Actuator Fault Check the wiring between the EconoMi$er controller and the actuator.

Minimum Position Set Incorrectly

EconoMi$er Changeover Set Point Set Too High or Too Low

Discharge Air Thermistor Faulty

Outdoor Air Temperature Sensor Faulty

Supply Air Low Limit Strategy Controlling

Ventilation Strategy

Controlling

Damper Travel is Restricted

Check to ensure that 24 vac is present at Terminal C1 (Common Power) on the IFC (Indoor [Evaporator] Fan Contactor) or that 24 vac is present at the IFO (Indoor [Evaporator] Fan On) terminal. Check whether 24 vac is present at PL6-1 (red wire) and/or PL6-3 (black wire). If 24 vac is not present, check wiring (see unit label diagram).

Check proper thermostat connection to G on the connection board. Check to ensure that 24 vac is present across Terminals 24 VAC and

24 V COM on the EconoMi$er control. If 24 vac is not present, check wiring (see unit label diagram). If 24 vac is present, STATUS light should be on constantly.

EconoMi$er controller. If 24 vac is not present, check wiring (see unit label diagram).

experiencing a fault condition. Cycle power to the controller. If condition continues, replace the EconoMi$er controller.

the thermostat is wired incorrectly. Check wiring between the thermostat and the connection board in the electrical panel. The fault condition is caused by Y2 being energized before Y1.

Hold CONFIG button between 3 and 10 seconds to verify the actuator’s operation. (This process takes 3 minutes to complete.)

Verify that the MIN POS (%) is set greater than zero. Adjust MIN POS (%) to 100% to verify operation, and then set to correct setting.

Set at correct value. See Table 5.

If STATUS light is flashing 4 flashes, Discharge Air Thermistor is faulty. Check wiring or replace sensor.

If STATUS light is flashing 5 flashes, Outdoor Air Temperature Sensor is faulty. Check wiring or replace sensor.

The supply-air temperature is less than 45 F, causing the minimum position to be decreased. Refer to the Start-Up instructions. Verify correct setting of MIN POS (%). If correct, EconoMi$er is operating correctly.

If a CO2 sensor is being used, and the damper position is greater than minimum position, the ventilation control strategy is controlling. Refer to The Start-Up instructions. EconoMi$er is operating correctly.

Check to ensure the damper is not blocked.

Table 18 — MoistureMiser Dehumidification Subcooler Service Analysis

PROBLEM CAUSE REMEDY

Subcooler will not energize

Subcooler will not deenergize

Low system capacity

No power to subcooler control transformer.

No power from subcooler control transformer to liquid line three way valve.

Liquid line three-way valve will not operate.

Liquid Line three-way valve will not close.

Low refrigerant charge or frosted coil.

Check power source. Ensure all wire connections are tight.

1. Fuse open; check fuse. Ensure continuity of wiring.

2. Subcooler control low pressure switch open. Cycle unit off and allow low-pressure switch to reset. Replace switch if it will not close.

3. Transformer bad; check transformer.

1. Solenoid coil defective; replace.

2. Solenoid valve stuck closed; replace.

Valve is stuck open; replace.

1. Check charge amount. See system charging section.

2. Evaporator coil frosted; check and replace subcooler control low pressure switch if necessary.

Page 34

SERVICE TRAINING

Packaged Service Training

programs are an excellent way to increase your knowledge of the equipment

discussed in this manual, including:

• Unit Familia r iz ation • Maintenance

• Installation Overview • Operating Sequence

A large selection of product, theory, and skills programs are available, using popular video-based formats and materials. All include video and/or slides, plus companion book.

Classroom Service Training

which includes “hands-on” experience with the products in our labs can mean increased confidence that really pays dividends in faster troubleshooting and fewer callbacks. Course descriptions and schedules are in our catalog.

CALL FOR FREE CA TALOG 1-800-962-9212

[ ] Packaged Service Training [ ] Classroom Service Training

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

Book 1 Ta b 1 b

PC 111 Catalog No. 535-034 Printed in U.S.A. Form 50TJ-17SI Pg 34 2-01 Replaces: 50TJ-14SI

Page 35

Page 36

START-UP CHECKLIST

MODEL NO.:

SERIAL NO.:

DATE: TECHNICIAN:

PRE-START-UP:



VERIFY THAT ALL P A CKIN G MATERIALS HAVE B EEN REMO VED F ROM UNI T



VERIFY INSTALLATION OF INDOOR FAN MOTOR ADJUSTMENT BOLT (016 UNITS) OR ADJUSTMENT

BOLT AND PLATE (020-028 UNITS)



VERIFY INSTALLATION OF ECONOMI$ER HOOD



VERIFY THAT CONDENSATE CONNECTION IS INST ALLED PER INSTRUCTIONS



VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT



CHECK THAT FILTE RS AN D SCR EEN S ARE C LEAN AN D IN P LACE



VERIFY THA T UNIT IS LEVEL



CHECK F AN WHEEL AND PROPELLER FOR LOCA TION IN HOUSING/ORIFICE, AND VERIFY SETSCREW

IS TIGHT



VERIFY THA T FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED



VERIFY THAT SCROLL COMPRESSOR IS ROT ATING IN THE CORRECT DIRECTION



VERIFY THAT CRANKCASE HEATER HAS BEEN ENERGIZED FOR 24 HOURS (SIZE 028 AND UNITS WITH

OP TI ONAL MOI STU RE MIS ER DE HUMI DI FIC ATION SYSTEM ONLY)

START-UP:

ELECTRICAL

SUPPLY VOLTAGE L1-L2 L2-L3 L3-L1 COMPRESSOR AMPS — COMPRESSOR NO. 1 L1 L2 L3

—COMPRESSOR NO. 2 L1 L2 L3

SUPPLY FAN AMPS

ELECTRIC HEAT AMPS (IF SO EQUIPPED) L1 L2 L31

EXHAUST FAN AMPS

TEMPERATURES

OUTDOOR-AIR TEMPERA TURE RETURN-AIR TEMPERATURE COOLING SUPPLY AIR ELECTRIC HEAT SUPPL Y AIR (IF SO EQUIPPED)

F DB (Dry-Bulb) F DB F WB (Wet-Bulb) F

PRESSURES

REFRIGERANT SUCTION CIRCUIT NO. 1 PSIG CIRCUIT NO. 2 PSIG REFRIGERANT DISCHARGE CIRCUIT NO. 1



VERIFY REFRIGERANT CHARGE USING CHARGING CHART ON PAGE 28.

PSIG CIRCUIT NO. 2 PSIG

GENERAL



ECONOMI$ER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS



VERIFY INSTALLATION OF ALL OPTIONS AND ACCESSORIES

CUT ALONG DOTTED LINE CUT ALONG DOTTED LINE

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

Book 1 Ta b 1 b

PC 111 Catalog No. 535-034 Printed in U.S.A. Form 50TJ-17SI Pg CL-1 2-01 Replaces: 50TJ-14SI

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