Carrier 50Tj016 028 Users Manual

50TJ016-028 to the manual 545c823f-e874-4567-93b4-7a1ac17ea64f

2015-01-24

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

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

Book 1

Ta b 1 b

Installation, Start-Up and

Service Instructions

CONTENTS Page

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

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

Step 1 — Provide Unit Support . . . . . . . . . . . . . . . . . . . . . .1

• ROOF CURB

• ALTERNATE UNIT SUPPORT

Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . . . .1

• POSITIONING

• ROOF MOUNT

Step 3 — Field Fabricate Ductwork . . . . . . . . . . . . . . . . . .7

Step 4 — Make Unit Duct Connections . . . . . . . . . . . . . . .7

Step 5 — Trap Condensate Drain . . . . . . . . . . . . . . . . . . . .7

Step 6 — Make Electrical Connections . . . . . . . . . . . . . .8

• FIELD POWER SUPPLY

• FIELD CONTROL WIRING

• OPTIONAL NON-FUSED DISCONNECT

• OPTIONAL CONVENIENCE OUTLET

Step 7 — Make Outdoor-Air Inlet

Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

• MANUAL OUTDOOR-AIR DAMPER

• OPTIONAL ECONOMI$ER

Step 8 — Install Outdoor-Air Hood. . . . . . . . . . . . . . . . . .12

Step 9 — Install All Accessories . . . . . . . . . . . . . . . . . . . .15

• MOTORMASTER® I CONTROL INSTALLATION

• MOTORMASTER III CONTROL INSTALLATION

Step 10 — Install Humidistat for Optional

MoistureMiser Dehumidification Package . . . . . . . . .16

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-24

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

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

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . 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, re-

pair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance func-

tions 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 precau-

tions in the literature, tags and labels attached to the unit, 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.

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.

Curb or adapter roof curb should be level. This is necessary

to permit unit drain to function properly. Unit leveling toler-

ance is ± 1/16 in. per linear ft in any direction. Refer to Accesso-

ry Roof Curb or Horizontal Adapter Roof Curb Installation In-

structions 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 — Inspect unit for

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 refer-

ence; leveling tolerance is ± 1/16 in. per linear ft in any direc-

tion. See Fig. 3 for additional information. Unit weight is

shown in Table 1.

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

shown in Fig. 3. Refer to rigging instructions on unit.

POSITIONING — Provide clearance around and above unit

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

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

lets near exhaust vents or other sources of contaminated air.

Although unit is weatherproof, guard against water from

higher level runoff and overhangs.

ROOF MOUNT — Check building codes for weight distribu-

tion requirements.

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 lim-

its. If limits are exceeded, the unit will automatically

lock the compressor out of operation. Manual reset will

be required to restart the compressor.

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.

50TJ016-028

Single-Package Rooftop Units

Electric Cooling with Electric Heat Option

NOTES:

1. Roof curb accessory is shipped disassembled.

2. Insulated panels: 1″ thick neoprene coated 11/2 lb density.

3. Dimensions in ( ) are in millimeters.

4. Direction of airflow.

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

6. A 90 degree elbow must be installed on the supply ductwork

below the unit discharge for units equipped with electric

heaters.

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

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

DIMENSIONS* (degrees and inches)

UNIT AB

Deg.in.Deg.in.

ALL .28 .45 .28 .43

PKG. NO. REF. CURB HEIGHT DESCRIPTION

CRRFCURB010A00 1′-2″ (305) Standard Curb 14″ High

CRRFCURB011A00 2′-0″ (610) Standard Curb for Units Requiring High Installation

CRRFCURB012A00 2′-0″ (610) Side Supply and Return Curb for High Installation

Fig. 1 — Roof Curb Details

NOTE: For preassembled horizontal adapter roof curb part no.

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

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 6-111/22121 4- 0 1219

020 1650 748 6-111/22121 3-10 1168

024 1700 771 6-111/22121 3- 7 1092

028 1850 839 6-111/22121 3- 5 1041

All panels must be in place when rigging.

POWER EXHAUST/BAROMETRIC RELIEF

(ACCESSORY ONLY)

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

UNIT

STD UNIT

WEIGHT

ECONOMI$ER

WEIGHT

CORNER

(A)

CORNER

(B)

CORNER

(C)

CORNER

(D) DIM A DIM B DIM C

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

50TJ016 1550 703 80 36.3 391 177 365 166 384 174 410 186 3-5 1041 3-6 1067 1-10 559

50TJ020 1650 748 80 36.3 399 181 384 174 402 182 439 199 3-4 1016 3-6 1067 1- 8 508

NOTES:

1. Refer to print for roof curb accessory dimensions.

2. Dimensions in [ ] are in millimeters.

3. Center of gravity.

4. Direction of airflow.

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

6. Minimum clearance:

•Rear: 7′-0″ (2134) for coil removal. This dimension can be

reduced to 4′-0″ (1219) if conditions permit coil removal from the

top.

•Left side: 4′-0″ (1219) for proper condenser coil airflow.

•Front: 4′-0″ (1219) for control box access.

•Right side: 4′-0″ (1219) for proper operation of damper and

power exhaust if so equipped.

•Top: 6′-0″ (1829) to assure proper condenser fan operation.

•Local codees or jurisdiction may prevail.

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

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

barricade requires no clearance.

8. Dimensions are from outside of corner post. Allow 0′-5/16″ (8) on

each side for top cover drip edge.

9. See drawing 50TJ500352 for service option details.

POWER EXHAUST/BAROMETRIC RELIEF

(ACCESSORY ONLY)

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

UNIT

STD UNIT

WEIGHT

ECONOMI$ER

WEIGHT

CORNER

(A)

CORNER

(B)

CORNER

(C)

CORNER

(D) DIM ADIM BDIM C

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

50TJ024 1700 771 80 36.3 419 190 394 179 425 193 463 210 3-4 1016 3-5 1041 1-8 508

50TJ028 1850 839 80 36.3 428 194 412 187 511 232 499 226 3-2 965 3-7 1092 1-8 508

NOTES:

1. Refer to print for roof curb accessory dimensions.

2. Dimensions in [ ] are in millimeters.

3. Center of gravity.

4. Direction of airflow.

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

6. Minimum clearance:

•Rear: 7′-0″ (2134) for coil removal. This dimension can be

reduced to 4′-0″ (1219) if conditions permit coil removal from the

top.

•Left side: 4′-0″ (1219) for proper condenser coil airflow.

•Front: 4′-0″ (1219) for control box access.

•Right side: 4′-0″ (1219) for proper operation of damper and

power exhaust if so equipped.

•Top : 6 ′-0″ (1829) to assure proper condenser fan operation.

•Local codees or jurisdiction may prevail.

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

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

barricade requires no clearance.

8. Dimensions are from outside of corner post. Allow 0′-5/16″ (8) on

each side for top cover drip edge.

9. See drawing 50TJ500352 for service option details.

Table 1 — Physical Data

LEGEND

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

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

†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.

UNIT 50TJ 016 020 024 028

208/230, 460 v 575 v

NOMINAL CAPACITY (tons) 15 18 20 25

OPERATING WEIGHT 1550 1650 1700 1850

EconoMi$er 80 80 80 80

MoistureMiser Dehumidification

Package 40 40 40 40

COMPRESSOR/MANUFACTURER Scroll, Copeland

Quantity...Model (Ckt 1, Ckt 2) 2...ZR94KC

50, 50

81, 81

1...ZR108KC,

1...ZR94KC

1...ZR125KC,

1...ZR108KC

1...ZR16M3,

1...ZR125KC

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

10-10

15-5 16-0 20-13

Circuit 2 12-3 13-6 13- 0

CONDENSER COIL Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced,

Aluminum Pre-Coated, or Copper Plate Fins

Rows...Fins/in. 2...17

21.7

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

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

Watts Input (Total) 1100 1100 3400 3400

EVAPORATOR COIL Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced or

Copper Plate Fins, Face Split

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 8.7 [208/230, 575 v]

9.5 [460 v]

10.2 [208/230, 575 v]

11.8 [380, 460 v]

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

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

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.) 7/87/811/813/813/8

Fan Pulley Pitch Diameter (in.) Low-Medium Static 6.0 6.4 9.4 9.4 8.0

High Static 5.2 — 8.0 7.9 6.4

Nominal Fan Shaft Diameter (in.) 13/16 13/16 17/16 17/16 17/16

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

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

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)

Low-Medium Static 48 44 37 37 36

High Static 55 — 34 44 45

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

High Static 1389 — 1178 1328 1470

Fan Shaft Diameter at Pulley (in.) 13/16 13/16 17/16 17/16 17/16

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

1...20 x 20 x 1

RETURN-AIR FILTERS Throwaway†

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

4...16 x 20 x 2

POWER EXHAUST 1/2 Hp, 208/230-460 v Motor Direct Drive, Propeller-Fan (Factory-Wired for 460 v)

Bhp — Brake Horsepower

TXV — Thermostatic Expansion Valve

Step 3 — Field Fabricate Ductwork — Secure all

ducts to building structure. Use flexible duct connectors be-

tween 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.

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 duct-

work may be connected as shown in Fig. 7 and 8. Attach all

ductwork to roof curb and roof curb basepans. Refer to installa-

tion instructions shipped with accessory roof curb for more

information.

Step 5 — Trap Condensate Drain — See Fig. 4, 5,

and 9 for drain location. Plug is provided in drain hole and

must be removed when unit is operating. One 3/4-in. half-

coupling is provided inside unit evaporator section for conden-

sate drain connection. An 81/2 in. x 3/4-in. diameter nipple and a

2-in. x 3/4-in. diameter pipe nipple are coupled to standard

3/4-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.

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 condi-

tioned space. If a 90 degree elbow cannot be installed, then

a grille of sufficient strength and density should be installed

to prevent objects from falling into the conditioned space.

Due to electric heater, supply duct will require 90 degree

elbow.

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)

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)

Step 6 — Make Electrical Connections

FIELD POWER SUPPLY — Unit is factory wired for volt-

age shown on nameplate.

When installing units, provide a disconnect, per NEC

(National Electrical Code) requirements, of adequate size

(Table 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%.

Use the following formula to determine the percentage of

voltage imbalance.

Percentage of Voltage Imbalance

EXAMPLE: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

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 voltage imbalance:

= 1.53%

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

low the maximum allowable 2%.

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 CONTROL WIRING — Install a Carrier-approved

accessory thermostat assembly according to the installation in-

structions included with the accessory. Locate thermostat as-

sembly on a solid wall in the conditioned space to sense aver-

age temperature.

Route thermostat cable or equivalent single leads of no. 18

AWG (American Wire Gage) colored wire from subbase termi-

nals 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 insu-

lated 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 directly connected to the thermostat and will

require a junction box and splice at the thermostat.

Set heat anticipator settings as indicated in Table 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.

= 100 x max voltage deviation from average voltage

average voltage

Average Voltage = 455 + 464 + 455

= 1371

= 457

Percentage of Voltage Imbalance = 100 x 7

457

IMPORTANT: If the supply voltage phase imbalance is

more than 2%, contact your local electric utility com-

pany immediately.

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

RH RC Y1 Y2 W1 W2 GCX

W1Y2

REMOVABLE JUMPER

RED

BLU

PNK

ORN

VIO

BLK

BRN

WHT

THERMOSTAT ASSEMBLY

UNIT LOW-VOLTAGE CONNECTIONS

Fig. 12 — Field Control Thermostat Wiring

Table 2 — Electrical Data

UNIT

50TJ

NOMINAL

VOLTAGE

(3 Ph,

60 Hz)

VOLTAGE

RANGE

COMPRESSOR OFM IFM POWER

EXHAUST

ELECTRIC

HEAT*

POWER

SUPPLY

No. 1 No. 2

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

016

(15 Tons)

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

—— — — 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

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

—— — — 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

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

—— — — 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

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

—— — — 30 40

2.1 4.8 —— 32 40

—— 50** 48 67 70

2.1 4.8 50** 48 70 70

020

(18 Tons)

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

—— — — 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

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

—— — — 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

575 518 633 12.1 80 10.8 80 3 0.5 0.75 5.0 6.0 —— — — 34 40

2.1 4.8 —— 36 40

024

(20 Tons)

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

—— — — 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

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

—— — — 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

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

—— — — 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

575 518 633 12.4 80 12.1 80 2 1 3.4 7.5 10.0 —— — — 44 50

2.1 4.8 —— 46 50

Table 2 — Electrical Data (cont)

LEGEND

*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 combi-

nation 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.

2. Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply volt-

age is greater than 2%. Use the following formula to determine

the percent of voltage imbalance.

% Voltage Imbalance

Example: Supply voltage is 460-3-60.

AB = 452 v

BC = 464 v

AC = 455 v

= 457

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

= 1.53%

This amount of phase imbalance is satisfactory as it is below the

maximum allowable 2%.

3. MCA calculation for units with electric heaters over 50 kW =

(1.25 x IFM amps) + (1.00 x heater FLA).

UNIT

50TJ

NOMINAL

VOLTAGE

(3 Ph,

60 Hz)

VOLTAGE

RANGE

COMPRESSOR OFM IFM POWER

EXHAUST

ELECTRIC

HEAT*

POWER

SUPPLY

No. 1 No. 2

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

028

(25 Tons)

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

—— — — 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

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

—— — — 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

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

—— — — 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

575 518 633 17.3 125 12.4 80 2 1 3.4 10.0 13.0 —— — — 54 70

2.1 4.8 —— 56 70

FLA — Full Load Amps

HACR — Heating, Air Conditioning and Refrigeration

IFM — Indoor (Evaporator) Fan Motor

LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP— Maximum Overcurrent Protection

NEC — National Electrical Code

OFM — Outdoor (Condenser) Fan Motor

RLA — Rated Load Amps

= 100 x max voltage deviation from average voltage

average voltage

Average Voltage = 452 + 464 + 455

= 1371

IMPORTANT: If the supply voltage phase imbalance is

more than 2%, contact your local electric utility company

immediately.

457

OPTIONAL NON-FUSED DISCONNECT — On units with

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 discon-

nect switch. Refer to the applicable disconnect wiring diagram.

To prevent breakage during shipping, the disconnect han-

dle and shaft are shipped and packaged inside the unit control

box. Install the disconnect handle before unit operation. To in-

stall the handle and shaft, perform the following procedure:

1. Open the control box door and remove the handle and

shaft from shipping location.

2. Loosen the Allen 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 dis-

connect 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 the

door is closed.

8. The handle must be in the OFF position to open the con-

trol box door.

OPTIONAL CONVENIENCE OUTLET — On units with

optional convenience outlet, a 115-v GFI (ground fault inter-

rupt) convenience outlet receptacle is provided for field wiring.

Field wiring should be run through the 7/8-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-air

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) — Set the

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 de-

sired vent position. Do not manually operate EconoMi$er

motor since damage to motor will result.

CONTROL

MODULE

ACTUATOR

ECONOMI$ER

Fig. 14 — 25% Outdoor-Air Section Details

Fig. 15 — EconoMi$er Damper Assembly

— End View

5L3 3L2 1L1 LINE

6T3 4T2 2T1 LOAD

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

Table 3 — Heat Anticipator Settings

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

and 575 v.

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 top panel and side panels, upper filter re-

tainer, and hood drain pan (Fig. 20).

3. Secure lower filter retainer and long section of filter sup-

port 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 panel flanges flat against unit, and install

screws removed in Step 5.

8. Insert outdoor-air inlet screens and spacer in channel cre-

ated by lower filter retainer and filter support bracket.

9. Attach remaining short section of filter support bracket.

OUTDOOR AIR ENTHALPY SENSOR INSTALLA-

TION — Perform the following procedure to install the out-

door 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 tem-

perature sensor. See Fig. 22.

3. Use a 1/4-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 the 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 self-

tapping 1/2-in. screws provided.

2. Mount the bracket to the inside of the return air opening

flange using a 1/4-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 har-

ness using tie wraps.

5. Wire the sensor to the EconoMi$er control module. See

Fig. 23 and 24.

UNIT

50TJ

UNIT

VOLTAGES kW* STAGE 1 STAGE 2

016-028

208/230-3-60

26/34 .40 .66

42/56 .66 .40

56/75 .66 .66

380-3-60 20 .40 .40

35 .40 .66

460-3-60 32 .40 .40

55 .40 .66

575-3-60 80 .66 .66

50 .66 .66

Fig. 18 — Outdoor-Air Hood Component Location

Fig. 16 — EconoMi$er Control Module

Adjustment Potentiometers

CONTROL MODULE ACTUATOR

Fig. 17 — EconoMi$er Control Module Location

COMMISSIONING — The EconoMi$er saves energy when

it uses outdoor air to provide free cooling instead of mechani-

cal air conditioning. The EconoMi$er switchover strategy de-

termines if the outdoor air is suitable for free cooling. The

EconoMi$er chooses the switchover strategy with the most en-

ergy savings, provided that the required sensors are connected

and functioning normally.

Refer to Table 4 to determine the sensors required for each

strategy.

Differential Enthalpy Switchover Strategy — The differen-

tial 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.

To return to single enthalpy mode, press and hold the CON-

FIG 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.

CO2 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 CO2 SP (PPM) potentiometer and adjust to the

desired set point. See Fig. 16.

IMPORTANT: If a sensor stops functioning nor-

mally (becomes unreliable), the EconoMi$er

switches to the next best strategy.

SENSOR

COVER

OUTSIDE AIR SENSOR

MOUNTING

SCREW

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)

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

HOOD TOP

PANEL

HOOD SIDE

PANELS (2)

BAFFLE

(028 ONLY)

LOWER

FILTER

RETAINER

FILTER SUPPORT

BRACKET

HOOD DRAIN PAN

UPPER FILTER RETAINER

BAFFLE (028 ONLY)

LOWER FILTER

RETAINER

FILTER SUPPORT

BRACKET

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 out-

door air temperature is below this value. See Fig. 16.

DRY BULB CHANGEOVER SET UP — Determine 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 Table 6.

Table 4 — EconoMi$er Switchover Control Strategy

*Must be selected manually.

Table 5 — Changeover Set Points

*Field-installed accessory.

Table 6 — Default Potentiometer Settings

ECONOMI$ER SWITCHOVER

STRATEGY

SENSORS REQUIRED

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

Dry Bulb X

Single Enthalpy X

Differential Temperature XX

Differential Enthalpy* XX

SETTINGS ABCD

Dry Bulb (°F) 73 69 66 63

Single Enthalpy* (Btu/lb) 27 25 24 22

Differential Temperature*

(°F, Not Adjustable) 2222

Differential Enthalpy*

(Btu/lb, Not Adjustable) 1111

POTENTIOMETER DEFAULT SETTING

CO2 SP (PPM) 1,000

MECH CLG LOCKOUT 50 F

ECON SP D

MIN POS (%) 20

LEGEND

*OAT sensor shipped with economizer option. OAH, RAT, RAH and CO2 are field-installed accessories.

Fig. 23 — Typical EconoMi$er Sensor Wiring

COM — Common

DAT — Discharge Air Thermistor

DM — Damper Motor

GND — Ground

OAH — Outdoor-Air Enthalpy Sensor

OAT — Outdoor-Air Temperature Sensor

POT — Potentiometer

RAH — Return-Air Enthalpy Sensor

RAT — Return-Air Temperature Sensor

REM — Remote

VENTILATION AIR (Minimum Position Set Up) — If ven-

tilation 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 con-

nection board.

2. Locate the minimum position (MIN POS) 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 fil-

ter 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

b. Multiply total CFM by percentage outdoor air, this

gives outdoor air volume in CFM.

Step 9 — Install All Accessories — After all the

factory-installed options have been adjusted, install all field-

installed accessories. Refer to the accessory installation instruc-

tions 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 1/4-in. diameter and

5/8-in. long. Drill required screw holes for mounting baffles.

% Outdoor air = Mixture Temp – Return Air Temp

Outdoor Temp – Return Air Temp

Personal Injury Hazard. Avoid possible injury by keep-

ing fingers away from damper blades.

To avoid damage to the refrigerant coils and electrical com-

ponents, use recommended screw sizes only. Use care

when drilling holes.

20 mA LED

1k ohm Potentiometer

2to10VDCat

0 to 2000 ppm

CO2 Sensors:

Remote

Minimum Position

Remote

LED

Outdoor Air Enthalpy

CROUTENT001A00

Return Air Enthalpy

CRRETENT001A00

Line

Voltage

COM

DAT

COM

REM

POT

COM

LED

COM

OAT

COM

OAH

+15V

RAT

COM

RAH

+15V

MPW

Violet

MPW

TViolet

Field-supplied Wiring Wiring Included

470 ohm

5watt

Resistor

24 VAC must be present

on BI for the system to be

unoccupied.

Unoccupied Control

(Part number on the control

must be AD-DME1701-1

or AD-DME1711-1.)

Unoccupied

Contact

Tan

Violet

White

Red

Tan

Violet

White

Red

24 VAC

20 VA

NOT

USED

(+)

323ZCSENCO

Fig. 24 — Typical EconoMi$er Sensor Wiring

Install Motormaster I Controls — 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 out-

door 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 — To ensure proper fan height, replace the exist-

ing 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, verti-

cally, with leads protruding from bottom of extrusion.

MOTORMASTER® III CONTROL INSTALLATION

(50TJ024 and 028 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 1/4-in. diameter and

5/8-in. long. Drill required screw holes for mounting baffles.

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 Motor-

master III control. Set the switch to accept the thermistor sen-

sor input signal. Set the frequency to match the unit power sup-

ply (60 Hz).

Motormaster III Control — Recommended mounting location

is beneath the control box, mounted to the partition that sepa-

rates 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 humidis-

tat. To install the humidistat perform the following procedure:

1. Locate humidistat on a solid interior wall in the condi-

tioned space. Location should be a well ventilated area

to sense average humidity.

2. Route thermostat cable or equivalent single leads of col-

ored 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.

To avoid damage to the refrigerant coils and electrical com-

ponents, use recommended screw sizes only. Use care

when drilling holes.

NOTE: Dimensions in ( ) are in mm.

Fig. 25 — Wind Baffle Details

SENSOR

LOCATION

HAIRPIN END

SENSOR

LOCATION

HAIRPIN END

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

bottom.

Fig. 26 — Motormaster® I Sensor Locations

SENSOR

LOCATION

HAIRPIN END

SENSOR

LOCATION

HAIRPIN END

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

bottom.

Fig. 27 — Motormaster III Sensor Locations

Fig. 28 — Typical MoistureMiser Dehumidification Package

Humidistat Wiring Schematic (460V Unit Shown)

LEGEND

LLSV — Liquid Line Solenoid Valve

LPS — Low Pressure Switch

TB — Terminal Block

TRAN — Transformer

50TJ016 50TJ020 50TJ024 50TJ028

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 applica-

ble 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) — Heater is energized as long as there is power to unit

and compressor is not operating.

Compressor Mounting — Compressors are internally

spring mounted. Do not loosen or remove compressor hold-

down bolts.

Refrigerant Service Ports — Each refrigerant sys-

tem has a total of 3 Schrader-type service gage ports. One port

is located on the suction line, one on the compressor discharge

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 — It is important to be certain

the compressors are rotating in the proper direction. To deter-

mine whether or not compressors are rotating in the proper di-

rection:

1. Connect service gages to suction and discharge pressure

fittings.

2. Energize the compressor.

3. The suction pressure should drop and the discharge pres-

sure 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. Note 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 com-

pressor internal overload protection will open, which will acti-

vate the unit’s lockout and requires a manual reset. Reset is ac-

complished by turning the thermostat on and off.

Evaporator Fan — Fan belt and variable pulleys are fac-

tory 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 pul-

ley settings. To alter fan performance, see Evaporator-Fan Per-

formance Adjustment section, page 25.

Table 7 — Air Quantity Limits

Condenser Fans and Motors — Fans and motors

are factory set. Refer to Condenser-Fan Adjustment section

(page 26) as required.

Return-Air Filters — Check that correct filters are in-

stalled in filter tracks. See Table 1. Do not operate unit without

return-air filters.

Outdoor-Air Inlet Screens — Outdoor-air inlet screens

must be in place before operating unit.

Accessory EconoMi$er Adjustment — Remove fil-

ter 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.

IMPORTANT: Unit power must be on for 24 hours prior

to start-up. Otherwise, damage to compressor may

result.

UNIT

50TJ MINIMUM CFM MAXIMUM CFM

016 4500 7,500

020 5400 9,000

024 6000 10,000

028 7000 11,250

Fig. 29 — Typical MoistureMiser Dehumidification

Package Control Box

Table 8 — Fan Performance — 50TJ016

LEGEND

*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-sup-

plied drive.

NOTES:

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

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.

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.

50TJ016 (15 TONS)*

Airflow

(Cfm)

Available External Static Pressure (in. wg)

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

4500 684 1.28 1102 791 1.49 1283 887 1.70 1466 977 1.92 1652 1061 2.13 1841 1139 2.36 2034

4800 715 1.47 1265 817 1.68 1451 910 1.90 1638 997 2.12 1828 1078 2.34 2021 1155 2.57 2217

5100 747 1.67 1442 844 1.89 1633 934 2.12 1825 1018 2.34 2019 1097 2.57 2216 1171 2.80 2416

5400 779 1.90 1635 872 2.12 1831 959 2.35 2027 1040 2.58 2226 1117 2.81 2426 1189 3.05 2629

5700 812 2.14 1844 901 2.37 2044 985 2.60 2245 1063 2.84 2448 1138 3.07 2652 1209 3.31 2858

6000 845 2.40 2068 931 2.64 2273 1011 2.87 2478 1087 3.11 2685 1160 3.35 2893 1229 3.60 3103

6300 878 2.68 2309 961 2.92 2518 1039 3.16 2728 1112 3.41 2939 1183 3.65 3151 1250 3.90 3365

6600 912 2.98 2566 992 3.22 2780 1067 3.47 2994 1138 3.72 3209 1207 3.97 3425 1273 4.22 3642

6900 946 3.29 2841 1023 3.55 3059 1096 3.80 3277 1165 4.05 3496 1232 4.31 3716 —— —

7200 981 3.63 3133 1055 3.89 3355 1125 4.15 3578 —— — —— — —— —

7500 1016 3.99 3443 1087 4.25 3669 —— — —— — —— — —— —

50TJ016 (15 TONS)* (cont)

Airflow

(Cfm)

Available External Static Pressure (in. wg)

1.4 1.6 1.8 1.9 2.0

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

4500 1214 2.59 2230 1285 2.82 2430 1353 3.05 2633 1386 3.17 2736 1418 3.29 2839

4800 1228 2.80 2417 1297 3.04 2619 1364 3.27 2825 1396 3.40 2928 1428 3.52 3033

5100 1243 3.04 2618 1311 3.27 2823 1376 3.51 3031 1408 3.64 3136 1439 3.76 3242

5400 1259 3.29 2835 1326 3.53 3043 1390 3.77 3254 1421 3.90 3360 1452 4.02 3467

5700 1277 3.56 3067 1342 3.80 3278 1405 4.05 3492 1435 4.17 3600 1466 4.30 3708

6000 1295 3.84 3316 1359 4.09 3530 1421 4.34 3746 —— — —— —

6300 1315 4.15 3580 —— — —— — —— — —— —

6600 —— — —— — —— — —— — —— —

6900 —— — —— — —— — —— — —— —

7200 —— — —— — —— — —— — —— —

7500 —— — —— — —— — —— — —— —

Bhp — Brake Horsepower

FIOP — Factory-Installed Option

Watts — Input Watts to Motor

Table 9 — Fan Performance — 50TJ020 and 024

LEGEND

*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

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

(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.

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.

50TJ020, 024 (18 and 20 TONS)*

Airflow

(Cfm)

Available External Static Pressure (in. wg)

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

5,500 682 1.99 1675 760 2.29 1922 832 2.59 2177 901 2.90 2441 965 3.22 2712 1027 3.56 2990

6,000 730 2.38 2005 802 2.68 2257 871 2.99 2516 935 3.31 2783 997 3.63 3057 1056 3.97 3337

6,500 778 2.82 2373 846 3.13 2630 911 3.44 2893 972 3.76 3164 1031 4.09 3440 1087 4.43 3722

7,000 828 3.31 2780 892 3.62 3042 953 3.94 3310 1011 4.26 3583 1067 4.59 3863 1121 4.93 4148

7,500 878 3.84 3227 938 4.15 3494 996 4.48 3766 1051 4.81 4043 1105 5.14 4326 1156 5.49 4613

8,000 928 4.42 3715 985 4.74 3986 1040 5.07 4263 1093 5.40 4544 1144 5.74 4830 1194 6.09 5120

8,500 979 5.05 4245 1033 5.38 4521 1085 5.71 4801 1136 6.05 5086 1185 6.39 5375 1232 6.74 5669

9,000 1030 5.73 4817 1082 6.06 5098 1131 6.40 5382 1180 6.74 5671 1227 7.09 5964 1272 7.44 6260

9,500 1082 6.46 5433 1131 6.80 5718 1178 7.14 6007 1225 7.49 6299 1270 7.84 6595 1313 8.20 6895

10,000 1134 7.25 6093 1180 7.59 6382 1226 7.94 6675 1270 8.29 6971 1313 8.65 7271 1356 9.01 7574

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

Airflow

(Cfm)

Available External Static Pressure (in. wg)

1.4 1.6 1.8 1.9 2.0

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

5,500 1086 3.89 3275 1142 4.24 3567 1197 4.59 3864 1223 4.77 4015 1249 4.96 4167

6,000 1112 4.31 3623 1167 4.66 3915 1219 5.01 4213 1245 5.19 4364 1270 5.37 4516

6,500 1142 4.77 4010 1194 5.12 4304 1245 5.47 4602 1270 5.65 4754 1294 5.83 4906

7,000 1173 5.28 4438 1224 5.63 4733 1273 5.98 5033 1296 6.17 5184 1320 6.35 5337

7,500 1207 5.83 4906 1255 6.19 5203 1302 6.55 5504 1326 6.73 5657 1348 6.91 5810

8,000 1242 6.44 5415 1289 6.80 5714 1334 7.16 6018 1357 7.34 6171 1379 7.52 6325

8,500 1279 7.10 5966 1324 7.45 6268 1368 7.82 6573 1389 8.00 6728 1411 8.18 6883

9,000 1317 7.80 6561 1360 8.16 6865 1403 8.53 7173 1424 8.71 7328 1445 8.90 7484

9,500 1356 8.56 7198 1398 8.93 7505 1440 9.29 7815 1460 9.48 7972 1480 9.67 8129

10,000 1397 9.37 7881 1438 9.74 8190 1477 10.11 8503 —— — —— —

Bhp — Brake Horsepower

FIOP — Factory-Installed Option

Watts — Input Watts to Motor

Table 10 — Fan Performance — 50TJ028

LEGEND

*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 maxi-

mum 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.

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.

50TJ028 (25 TONS)*

Airflow

(Cfm)

Available External Static Pressure (in. wg)

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

7,000 845 3.26 2693 909 3.60 2979 969 3.96 3272 1028 4.32 3574 1083 4.70 3883 1137 5.08 4,200

7,500 896 3.82 3156 956 4.17 3450 1014 4.54 3752 1069 4.91 4060 1123 5.29 4375 1174 5.68 4,698

8,000 948 4.43 3667 1005 4.80 3969 1060 5.17 4278 1112 5.56 4593 1163 5.94 4915 1213 6.34 5,243

8,500 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

9,000 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

9,500 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

10,000 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

10,500 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

11,000 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

11,250 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

50TJ028 (25 TONS)* (cont)

Airflow

(Cfm)

Available External Static Pressure (in. wg)

1.4 1.6 1.8

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

7,000 1189 5.47 4,524 1239 5.87 4,854 1288 4.91 5191

7,500 1224 6.08 5,026 1272 6.48 5,362 1320 5.56 5703

8,000 1261 6.75 5,577 1307 7.16 5,917 1353 6.26 6263

8,500 1299 7.47 6,177 1344 7.89 6,523 1388 7.02 6873

9,000 1338 8.26 6,828 1382 8.68 7,179 1424 7.85 7534

9,500 1379 9.11 7,530 1421 9.54 7,887 1462 8.74 8247

10,000 1421 10.02 8,286 1461 10.46 8,648 1501 9.70 9014

10,500 1464 11.00 9,096 1503 11.45 9,464 1541 10.73 9835

11,000 1508 12.05 9,963 1546 12.50 10,336 —— —

11,250 1530 12.60 10,417 —— ————

Bhp — Brake Horsepower

FIOP — Factory-Installed Option

Watts — Input Watts to Motor

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

LEGEND NOTES:

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 deter-

mine 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

LEGEND

FIOP — Factory-Installed Option

NOTES:

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 deter-

mine blower rpm and watts.

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

575-v heaters.

Table 13 — MoistureMiser Dehumidification

Package Static Pressure Drop (in. wg)

Table 14 — Fan Rpm at Motor Pulley Settings*

*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.

COMPONENT CFM

4500 5000 6000 7200 7500

EconoMi$er 0.04 0.05 0.07 0.09 0.10

Glycol Coil 0.22 0.26 0.35 0.44 0.46

Electric Heat (kW)

20 0.06 0.07 0.09 0.11 0.12

26/34 0.06 0.07 0.09 0.11 0.12

32 0.06 0.07 0.09 0.11 0.12

35 0.07 0.08 0.12 0.15 0.17

42/56 0.07 0.08 0.12 0.16 0.17

50 0.09 0.10 0.15 0.20 0.21

55 0.07 0.08 0.12 0.15 0.17

56/75 0.09 0.10 0.15 0.20 0.21

80 0.09 0.10 0.15 0.20 0.21

FIOP — Factory-Installed Option

COMPONENT CFM

5400 6000 7200 9000 10,000 11,250

EconoMi$er 0.06 0.07 0.09 0.11 0.12 0.14

Glycol Coil 0.30 0.35 0.44 0.58 0.66 0.77

Electric Heat (kW)

20, 26/34 0.08 0.09 0.11 0.15 0.17 0.20

32 0.08 0.09 0.11 0.15 0.17 0.20

35, 42/56 0.11 0.12 0.15 0.19 0.21 0.24

55 0.11 0.12 0.15 0.19 0.21 0.24

56/75 0.14 0.15 0.20 0.24 0.26 0.29

80 0.14 0.15 0.20 0.24 0.26 0.29

UNIT SIZE

50TJ

UNIT NOMINAL

TONS

CFM PER TON

300 400 500

016 15 .040 .071 .111

020 18 .058 .102 .160

024 20 .071 .126 .197

028 25 .111 .197 .308

UNIT

50TJ

MOTOR PULLEY TURNS OPEN

01/211

1/222

1/233

1/244

1/255

1/26

016 (208/230, 380, 460 v)† †† †† 1179 1150 1121 1093 1064 1035 1006 978 949 920 891

016 (208/230, 380, 460 v)** †† †† 1559 1522 1488 1455 1422 1389 1356 1323 1289 1256 1227

016 (575 v)† †† †† 1429 1403 1376 1349 1323 1296 1269 1242 1215 1188 1159

020† †† †† 1095 1077 1058 1040 1021 1002 984 965 947 928 910

020** †† †† 1287 1265 1243 1222 1200 1178 1156 1134 1112 1091 1069

024† †† †† 1225 1209 1187 1165 1143 1120 1098 1076 1053 1031 1002

024** †† †† 1458 1434 1407 1381 1354 1328 1301 1275 1248 1222 1193

028† †† †† 1283 1269 1247 1225 1203 1182 1160 1138 1116 1095 1066

028** †† †† — — 1551 1524 1497 1470 1443 1415 1388 1361 1332

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 motor,

compressor no. 1 and condenser fans start. The condenser-fan

motors run continuously while unit is cooling. If the thermostat

calls for a second stage of cooling by energizing Y2, compres-

sor contactor no. 2 (C2) is energized and compressor no. 2

starts.

HEATING, UNITS WITHOUT ECONOMI$ER (If Acces-

sory or Optional Heater is Installed) — Upon a call for heat-

ing through terminal W1, IFC and heater contactor no. 1 (HC1)

are energized. On units equipped for 2 stages of heat, when ad-

ditional 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), the indoor-fan motors

(IFM) is energized and the EconoMi$er damper 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 SAT drops

below 53 F, the outdoor air damper modulates closed to reduce

the amount of outdoor air. When the SAT is between 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 ener-

gized. The position of the EconoMi$er damper is main-

tained 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 posi-

tion of the EconoMi$er damper is maintained at its cur-

rent value.

3. If Y1 is energized, and compressor no. 1 is already ener-

gized (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 compressor no. 2 is energized, and the Y2 signal from

the thermostat is satisfied, compressors 1 and 2 are deen-

ergized. 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 sat-

isfied, compressor no. 1, the OFM, and IFM are deener-

gized 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 mini-

mum 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), com-

pressors, 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 field-

installed, wall-mounted humidistat is required. If the Mois-

tureMiser humidistat is installed and calls for the Mois-

tureMiser 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 approach-

ing the evaporator coil leaving-air temperature. The state of the

refrigerant leaving the subcooler coils is a highly subcooled liq-

uid 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. The

liquid proceeds to the evaporator coils 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 re-

sult of the colder refrigerant temperatures. However, as it pass-

es over the subcooler coils, the air will be warmed, decreasing

the sensible capacity and reducing the sensible heat of the roof-

top 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 low-

pressure switch will deactivate the MoistureMiser package

when the suction pressure reaches 60 psig. The subcooler con-

trol low-pressure switch is an added safety device to protect

against evaporator coil freeze-up during low ambient opera-

tion. The subcooler control low-pressure switch will only

deactivate the 3-way liquid line solenoid valve in the Mois-

tureMiser 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 reactivated only

when the call for cooling has been satisfied, the subcooler con-

trol low-pressure switch has closed above 80 psig, and a new

call for cooling exists. The crankcase heaters on the scroll com-

pressors provide additional protection for the compressors due

to the additional refrigerant charge in the subcooler.

When the humidistat is satisfied, the humidistat internal

switch opens, cutting power to and deenergizing the LLSVs.

The refrigerant is routed back through the evaporators and the

sub-cooler coils are removed from the refrigerant loops. When

the thermostat is satisfied, C1 and C2 are deenergized and the

compressors, IFM, and OFMs shut off. If the thermostat

fan selector switch is in the ON position, the IFM will run

continuously.

SERVICE

Cleaning — Inspect unit interior at beginning of each heat-

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 commer-

cial coil cleaner.

NOTE: The 50TJ028 unit has a mist eliminator screen attached

to the evaporator coil to prevent condensate runoff at high wet-

bulb conditions. Check periodically and clean as necessary.

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 cool-

ing season, or more often if operating conditions require. Refer

to Table 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 re-

charge should be four ounces less than the original oil charge.

When a compressor is exchanged in the field it is possible that

a major portion of the oil from the replaced compressor may

still be in the system. While this will not affect the reliability of

the replacement compressor, the extra oil will add rotor 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

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.

Fig. 30 — MoistureMiser Operation Diagram

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

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.

Typical lubricants are given below:

*Preferred lubricant because it contains rust and oxidation inhibitors.

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) — Fan motor pulleys are factory set for speed

shown in Table 1.

To 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 this position by tight-

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. In-

creasing fan speed increases load on motor. Do not ex-

ceed maximum speed specified in Table 1.

See Table 7 for air quantity limits.

5. Set movable flange at nearest keyway of pulley hub and

tighten setscrew. (See Table 1 for speed change for each

full turn of pulley flange.)

6. Replace and tighten belts. See Belt Tension Adjustment

section on page 26.

To 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.

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 carriage nuts A and B holding motor mount as-

sembly to fan scroll side plates.

4. Loosen screw C.

5. Rotate motor 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.

50TJ020-028 UNITS (See Fig. 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 bracket.

1. Remove the evaporator-fan access panel and the heating

control access panel.

2. Remove the center post (located between the evaporator

fan and heating control access panels) and all screws se-

curing it.

3. Loosen nuts on the two carriage bolts in the motor mount-

ing 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 connections and remove the 4 mount-

ing bolts.

11. Remove the motor.

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

MANUFACTURER LUBRICANT

Texaco Regal AFB-2*

Mobil Mobilplex EP No. 1

Sunoco Prestige 42

Texaco Multifak 2

Fig. 31 — Evaporator-Fan Pulley Alignment

and Adjustment

Belt Tension Adjustment — To adjust belt tension:

1. Loosen fan motor bolts.

2. Adjust belt tension:

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

down for proper belt tension (1/2 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 (3/8 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.

4. Tighten setscrews and replace rubber hubcap to prevent

hub from rusting to motor shaft.

5. Fill hub recess with permagum if rubber hubcap is

missing.

Fig. 32 — 50TJ016 Evaporator-Fan

Motor Section

NOTE: A 31/2-in. bolt and threaded plate are included in the

installer’s packet. They should be added to the motor support chan-

nel below the motor mounting plate to aid in raising the motor. The

plate part number is 50DP503842. The adjustment bolt is 3/8-16 x

13/4 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

EconoMi$er Adjustment

LED INDICATION — 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 control-

ler 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 non-

critical 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 (CON-

FIG) 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 auto-

matic 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 con-

troller 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 thermo-

stat 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 than

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 GTAC

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 as it may contain con-

taminants.

NO CHARGE — Use standard evacuating techniques. After

evacuating system, weigh in the specified amount of refriger-

ant (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 temperature-

sensing device is required. Charging is accomplished by ensur-

ing 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 intersec-

tion 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 the charge. Re-

check suction pressure as charge is adjusted. NOTE: Indoor-air

CFM must be within normal operating range of unit. All out-

door 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 Normal operation Normal operation.

Constant Off No power No operation.

Continuous

Flash

CONFIG button pushed and held

between 3 and 9 seconds

Outdoor air damper is stroked fully open, then closed

(automatic test procedure takes 3 minutes to complete).

Critical Fault

Flash One Control board fault System shutdown.

Flash Two Thermostat fault (i.e., Y2 without Y1) System shutdown until corrected.

Flash Three Actuator fault Revert to mechanical cooling only.

Flash Four Discharge air thermistor fault Continue operation with damper at minimum position.

Revert to mechanical cooling only.

Flash Five Outdoor air temperature sensor fault Continue operation with damper at minimum position.

Disable mechanical cooling lockout.

Non-Critical Fault

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

Flash Seven Return air temperature sensor fault

Continue operation with single enthalpy EconoMi$er

switchover or dry bulb EconoMi$er switchover (without

humidity sensor).

Flash Eight Return air humidity sensor fault Continue operation with single enthalpy, differential dry

bulb, or dry bulb EconoMi$er switchover.

Flash Nine Carbon Dioxide (CO2) sensor fault Continue operation without ventilation control.

Flash Ten Onboard adjustment potentiometer fault Continue operation with default potentiometer settings.

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 with 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 name-

plate specified charge level. To check or adjust refrigerant

charge on systems using the MoistureMiser Dehumidification

package, charge per the standard subcooling charts. The sub-

cooler 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 system is ex-

posed to atmosphere.

Protective Devices

COMPRESSOR PROTECTION

Overcurrent — Each compressor has internal line break motor

protection, except the circuit no. 1 on the 50TJ028 unit. Com-

pressor no. 1 on the 50TJ028 unit uses an electronic module lo-

cated with the compressor junction box, to provide motor pro-

tection. This electronic module monitors winding and dis-

charge temperatures. If these temperatures reach the trip

values, the module interrupts the control line and causes the

compressor to switch off.

Crankcase Heater — Only the 50TJ028 unit and units with

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 compres-

sor is idle. The crankcase heater is energized whenever there is

a main power to the unit and the compressor is not energized.

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 compressors,

the CLO (compressor lockout) will lock the compressors off.

To reset, manually move the thermostat setting.

EVAPORATOR FAN MOTOR PROTECTION — A manu-

al 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 SWITCHES — If either

switch trips, or if the compressor overtemperature switch acti-

vates, 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 de-

tects 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 de-

vices protect the high and low side.

Control Circuit, 24-V — This control circuit is protect-

ed against overcurrent by a 3.2-amp circuit breaker. 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 identifica-

tion is shown in Table 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 1/4 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 ac-

cess 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 1/4 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.

IMPORTANT: After prolonged shutdown or servicing,

energize the crankcase heaters for 24 hours before start-

ing the compressors.

40 100 150 200 250 300 350 400

100

120

140

ALL OUTDOOR FANS MUST BE OPERATING

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

LIQUID TEMPERATURE AT LIQUID VALVE (DEG F)

BOTH CIRCUITS

REDUCE CHARGE IF BELOW CURVE

ADD CHARGE IF ABOVE CURVE

Fig. 36 — Cooling Charging Chart

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

ELECTRIC HEAT

208/240 v Amps 200/230 v kW

A71.3/82.3 25.7/34.2

B117/135 42.2/56.1

C156/180 56.2/74.8

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

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

LEGEND AND NOTES FOR FIG. 37 AND 38

LEGEND

AHA —Adjustable Heat Anticipator

BRK W/AT —Breaks with Amp Turns

C—Contactor, Compressor

CB —Circuit Breaker

CC —Cooling Compensator

CH —Crankcase Heater

CLO —Compressor Lockout

COMP —Compressor Motor

CR —Control Relay

DAT —Discharge Air Thermistor

DM —Damper Motor

DU —Dummy Terminal

EC —Enthalpy Control

EQUIP —Equipment

FL —Fuse Link

FLA —Full Load Amps

FPT —Freeze Protection Thermostat

FU —Fuse

GND —Ground

HC —Heater Contactor

HPS —High-Pressure Switch

HTR —Heater

IFC —Indoor-Fan Contactor

IFCB —Indoor-Fan Circuit Breaker

IFM —Indoor-Fan Motor

IFR —Indoor-Fan Relay

L—Light

LOR —Lockout Relay

LPS —Low-Pressure Switch

LS —Limit Switch

NEC —National Electrical Code

OAT —Outdoor-Air Thermostat

OFC —Outdoor-Fan Contactor

OFM —Outdoor-Fan Motor

OP —Overcurrent Protection

PL —Plug Assembly

PRI —Primary

TB —Te r m i n a l B l o c k

TC —Thermostat Cooling

TH —Thermostat Heating

TRAN —Transformer

Terminal (Marked)

Terminal (Unmarked)

Te r m i n a l B l o c k

Splice

Factory Wiring

Field Control Wiring

Option/Accessory Wiring

To indicate common potential

only; not to represent wiring.

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, dis-

connect 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 over-

load 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) num-

bers signifies a single-pole, double-throw contact. An underlined number sig-

nifies a normally closed contact. Plain (no line) number signifies a normally open

contact.

TROUBLESHOOTING

Refer to Tables 16-18 for troubleshooting details.

Table 16 — Cooling Service Analysis

LEGEND

TXV — Thermostatic Expansion Valve

PROBLEM CAUSE REMEDY

Compressor and

condenser fan

will not start.

Power failure. Call power company.

Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker.

Defective thermostat, contactor, transformer, or control

relay.

Replace component.

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.

Compressor will not start

but condenser fan runs.

Faulty wiring or loose connections in compressor circuit. Check wiring and repair or replace.

Compressor motor burned out, seized, or internal over-

load open.

Determine cause. Replace compressor.

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.

Determine cause.

Compressor cycles

(other than normally

satisfying thermostat).

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

to nameplate.

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.

Compressor operates

continuously.

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.

Excessive head pressure. 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

suction line.

2. Replace TXV if stuck open or closed.

Air in system. Recover refrigerant, evacuate system, and recharge.

Condenser air restricted or air short-cycling. Determine cause and correct.

Head pressure too low. Low refrigerant charge. Check for leaks, repair, and recharge.

Restriction in liquid tube. Remove restriction.

Excessive suction

pressure.

High heat load. Check for source and eliminate.

Faulty TXV. 1. Check TXV bulb mounting and secure tightly to

suction line.

2. Replace TXV if stuck open or closed.

Refrigerant overcharged. Recover excess refrigerant.

Suction pressure too low. 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

suction line.

2. Replace TXV if stuck open or closed.

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

necessary.

Temperature too low in conditioned area. Reset thermostat.

Field-installed filter drier restricted. Replace.

Table 17 — EconoMi$er Troubleshooting

LEGEND

Table 18 — MoistureMiser Dehumidification Subcooler Service Analysis

PROBLEM POTENTIAL CAUSE REMEDY

Damper Does Not

Open

Indoor (Evaporator) Fan is

Off

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.

No Power to EconoMi$er

Controller

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.

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

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

label diagram).

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

experiencing a fault condition. Cycle power to the controller. If condition

continues, replace the EconoMi$er controller.

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

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.

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

Hold CONFIG button between 3 and 10 seconds to verify the

actuator’s operation. (This process takes 3 minutes to complete.)

EconoMi$er

Operation Limited to

Minimum Position

Minimum Position Set

Incorrectly

Verify that the MIN POS (%) is set greater than zero. Adjust MIN POS (%)

to 100% to verify operation, and then set to correct setting.

EconoMi$er Changeover

Set Point Set Too High or

Too Low

Set at correct value. See Table 5.

Discharge Air

Thermistor Faulty

If STATUS light is flashing 4 flashes, Discharge Air Thermistor is

faulty. Check wiring or replace sensor.

Outdoor Air Temperature

Sensor Faulty

If STATUS light is flashing 5 flashes, Outdoor Air Temperature Sensor is

faulty. Check wiring or replace sensor.

Damper Position

Less than Minimum

Position Set Point

Supply Air Low Limit

Strategy Controlling

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.

Damper Does Not

Return to Minimum

Position

CO2 Ventilation Strategy

Controlling

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.

Damper Does Not

Close on Power Loss

Damper Travel is

Restricted

Check to ensure the damper is not blocked.

IFM —Indoor Fan Motor

PL —Plug

PROBLEM CAUSE REMEDY

Subcooler will not energize No power to subcooler

control transformer.

Check power source. Ensure all wire connections

are tight.

No power from subcooler

control transformer to liquid line three way valve.

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.

Liquid line three-way valve

will not operate.

1. Solenoid coil defective; replace.

2. Solenoid valve stuck closed; replace.

Subcooler will not deenergize Liquid Line three-way valve

will not close.

Valve is stuck open; replace.

Low system capacity Low refrigerant charge or

frosted coil.

1. Check charge amount. See system charging

section.

2. Evaporator coil frosted; check and replace

subcooler control low pressure switch if necessary.

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

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

Book 1

Ta b 1 b

SERVICE TRAINING

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

discussed in this manual, including:

• Unit Familiarization • 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 CATALOG 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.

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

Book 1

Ta b 1 b

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - -

CUT ALONG DOTTED LINE CUT ALONG DOTTED LINE

START-UP CHECKLIST

PRE-START-UP:

VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT

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 INSTALLED PER INSTRUCTIONS

VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT

CHECK THAT FILTERS AND SCREENS ARE CLEAN AND IN PLACE

VERIFY THAT UNIT IS LEVEL

CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE, AND VERIFY SETSCREW

IS TIGHT

VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED

VERIFY THAT SCROLL COMPRESSOR IS ROTATING IN THE CORRECT DIRECTION

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

OPTIONAL MOISTUREMISER DEHUMIDIFICATION SYSTEM ONLY)

START-UP:

ELECTRICAL

SUPPLY FAN AMPS EXHAUST FAN AMPS

TEMPERATURES

OUTDOOR-AIR TEMPERATURE F DB (Dry-Bulb)

RETURN-AIR TEMPERATURE F DB F WB (Wet-Bulb)

COOLING SUPPLY AIR F

ELECTRIC HEAT SUPPLY AIR (IF SO EQUIPPED) F

PRESSURES

VERIFY REFRIGERANT CHARGE USING CHARGING CHART ON PAGE 28.

GENERAL

ECONOMI$ER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS

VERIFY INSTALLATION OF ALL OPTIONS AND ACCESSORIES

MODEL NO.: SERIAL NO.:

DATE: TECHNICIAN:

SUPPLY VOLTAGE L1-L2 L2-L3 L3-L1

COMPRESSOR AMPS — COMPRESSOR NO. 1 L1 L2 L3

—COMPRESSOR NO. 2 L1 L2 L3

ELECTRIC HEAT AMPS (IF SO EQUIPPED) L1 L2 L31

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

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

Carrier 50Tj016 028 Users Manual

50TJ016-028 to the manual 545c823f-e874-4567-93b4-7a1ac17ea64f

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