Carrier 48TJ016-028 User Manual

Single-Package Rooftop Units

Electric Cooling/Gas Heating

Installation, Start-Up and

Service Instructions

48TJ016-028

CONTENTS

Page

SAFETY CONSIDERATIONS............................................I

INSTALLATION.............................................................2-31

Step 1 — Provide Unit Support............................................2

• ROOF CURB

• ALTERNATE UNIT SUPPORT
Step 2 —- Rig and Place Unit

• POSITIONING

• ROOF MOUNT

Step 3 — Field Fabricate Ductwork.....................................9

Step 4 — Make Unit Duct Connections
Step 5 — Install Flue Hood and Wind Baffle

Step 6 — Trap Condensate Drain........................................9

Step 7 — Orifice Change
Step 8 — Install Gas Piping
Step 9 — Make Electrical Connections

• FIELD POWER SUPPLY

• FIELD CONTROL WIRING

• OPTIONAL NON-FUSED DISCONNECT

• OPTIONAL CONVENIENCE OUTLET

Step 10 — Make Outdoor-Air Inlet Adjustments,. 14
Step 11 — Install Outdoor-Air Hood

Step 12 — Install All Accessories.......................................15

MOTORMASTER® I CONTROL INSTALLATION
MOTORMASTER V CONTROL INSTALLATION

Step 13 — Adjust Factory-Installed Options

PREMIERLINKTM CONTROL
ENTHALPY SWITCH/RECEIVER
OUTDOOR ENTHALPY CONTROL
DIFFERENTIAL ENTHALPY CONTROL
ENTHALPY SENSORS AND CONTROL
OPTIONAL ECONOMISERIV AND

ECONOMI$ER2

ECONOMI$ERIV STANDARD SENSORS
ECONOMI$ERIV CONTROL MODES

Step 14 — Install Humidlstat for

Optional MoistureMISer’'“ Package

START-UP......................................................................31-38

SERVICE........................................................................39-47

TROUBLESHOOTING

INDEX...................................................................................53

START-UP CHECKLIST..............................................CL 1

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10

11
11

14

17

29

48 52

precautions in the literature, tags and labels attached to the unit,
and other safety precautions that may apply.

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

A WARNING

2

9

9

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

A WARNING

1. Improper instiillation, adjustment, alteration, service,
or maintenance can cause properfy ckimage, personal
injuiy, or loss of life. Refer to the User's Information
Manual provided with this unit for more details.

2, Do not store or use gasoline or other flammable

vapors and liquids in the vicinity of tliis or any otlier
appliance.

What to do if you smell gas:

1. DO NOT tiy to light any appliance.

2. DO NOT touch any electrical switch, or use any
phone in your building,

3. IMMEDIATELY call your gas supplier from a neigh
bor’s phone. Follow the gas supplier’s instmctions.

4. If you cannot reach your gas supplier, cttll the fire
deparfment.

A WARNING

Disconnect gas piping from unit when pressure testing at
pressure greater than 0.5 psig. Pressures greater than

0.5 psig will cause gas valve damage resulting in haziu'dous
condition. If gas valve is subjected to pressure greater than

0.5 psig, it must be replaced before use. When pressure
testing field-supplied gas piping at pressures of 0.5 psig or
less, a unit connected to such piping must be isolated by
closing the manual gas valve(s).

SAFETY CONSIDERATIONS

Installation and seiTicing of air-conditioning equipment can
be hazardous due to system pressure and electrictil compo
nents, Only triiined and qualified service personnel should in
stall, repair, 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

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

Book 1 |4

Tab lajca

Catalog No. 04-53480009-01 Printed in U.S.A. Form 48TJ-22SI Pg 1 3-06 Replaces: 48TJ-21SI

IMPORTANT: Units have high ambient operating lim
its. If limits are exceeded, the units will automatically
lock the compressor out of operation. Manuiil reset will
be required to restiuf the compressor.

INSTALLATION

Inspect unit for transportation danage. If cktmage is found,

file claim with transportation agency.

Step 1 — Provide Unit Support

ROOF CURB — Assemble and install accessoiy roof curb or
horizontiil adapter roof cuifi in accordance witli instinctions
shipped with this accessoiy. See Fig. 1 and 2. Install insulation,
cant strips, roofing, and counter flashing as shown. Ductwork
can be installed to roof curb or horizontal adapter roof curb be
fore unit is set in place. Curb or adapter roof curb should be
level. Tills is necessaiy to permit unit drain to function proper
ly. Unit leveling tolerance is ± Vu, in. per linear ft in any direc
tion. Refer to Accessoiy Roof Curb or Horizontal Adapter
Roof Curb Installation Instmctions for additional information
as required. When accessoiy roof curb or horizontal adapter
roof curb is used, unit may be installed on class A, B, or C roof
covering material.

IMPORTANT: The gasketing of the unit to the roof curb
or adapter roof curb is critical for a watertight setil.
InstiJI gasket with the roof curb or adapter as shown in
Fig. 2. Improperly applied gasket can also result in air
leaks and poor unit performance.

ALTERNATE UNIT SUPPORT ^ When the curb or adapter
cannot be used, install unit on a noncombustible surface. Sup
port unit with sleepers, using unit curb 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 — Do not di'op unit;
keep upright. Use spreader biu's over unit to prevent sling or
cable diimage. Rollers may be used to move unit across a roof.
Level by using unit frame as a reference; leveling tolerance is
±V](i in. per linear ft in any direction. See Fig. 3 for additional
information. Unit operating 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 instmctions on unit.
POSITIONING — Maintain clearance, per Fig. 4 and 5,

around and above unit to provide minimum distance from
combustible materials, proper airflow, and service access.

Do not install unit in an indoor location. Do not locate unit
air inlets near exhaust vents or other sources of contaminated
air. For proper unit operation, adequate combustion and venti
lation ail' must be provided in accordance with Section 5.3 (Air
for Combustion and Ventilation) of the National Fuel Gas
Code, ANSI Z223.1 (American National Standards Institute).

Although unit is weatlierproof, guard against water from
higher level mnoff and overhangs.

Locate mechanical di'aft system flue assembly at least 4 ft
from any opening through which combustion products could
enter the building, and at least 4 ft from any adjacent building.
When unit is located adjacent to public walkways, flue assem
bly must be at least 7 ft above grade.

ROOF MOUNT — Check building codes for weight distri
bution requirements. Unit operating weight is shown in
Table 1.

Instructions continued cm page 9.

NOTE: CRRFCURB013A00 is a fuliy factory prsassembied hori
zontal adapter and includes an insulated transition duct. The pres
sure drop through the adapter curb is negligible.

For horizontal return applications; The power exhaust and baro

metric relief dampers must be installed in the return air duct.

Fig. 1 — Horizontal Supply/Return Adapter Installation

ACCESSORY

PACKAGE NO.

CRRFCURB013AOO

CURB

HEIGHT

(584)

DESCRIPTION

Pre-Assembled, Roof Curb,

Horizontal Adapter

PKG. NO. REF.

CURB

HEIGHT

DESCRIPTION

CRRFCURB010A00 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

NOTES:

K ROOF CURB ACCESSORY 15 SHIPPED D15AS5EHBLED.

2. INSULATED PANELS: 1* THICK NEOPRENE COATED 1-1/2 LB DENSITY

3. DIMENSIONS IN C ) ARE IN MILLIMETERS.

4. c=i> direction of AIR FLOW

5. ROOFCURB: 16 GA. CVA03-56) STL.
S. A 30 DEGREE ELBOW MUST BE INSTALLED ON THE SUPPLY DUCT

WORK BELOW THE UNIT DISCHARGE FOR UNITS EQUIPPED WITH
ELECTRIC HEATERS.

NOTE;
TO PREVENT THE HAZARD OF STAGNANT WATER
BUllD-UP IN THE DRAIN PAN OF THE INDOOP
SECTION, UNIT CAN ONLY BE PITCHED AS SHOWN.

....

.

UNIT

ALL .26 .45 .28 .43

CONDENSER

AND

COMPRESSOR

END

DIMENSIONS (degrees ond inches)

A

DEG. IN. DEG. IN.

UNIT LEVELING TOLERANCES

-nom edge oF unit to horizcntoL.

B

A-

NOM. 5/4 K

(323 X (1023

TYP. 4 PLC5

COUNTER FLASHING;

A

CRRFCURB012A00'0NLY) 0

<CRRFCURB012AOO ONLY)

(FIELD SUPPLIED)

•ROOFING FELT
(FIELD SUPPLIED)

■CANT STRIP

(FIELD SUPPLIED)

ROOFING MATERIAL

(FIELD SUPPLIED)

Fig. 2 — Roof Curb Details

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 on all units.

5. Weights do not include optional economizer. Add 90 lb (41 kg) for economizer weight.

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

A CAUTION

All panels must be in place when rigging.

UNIT
48TJ

016 1775 805
020 1875 850 6-11 Vg 2121 3-3 991
024 1985 900
028 2135 968 6-11 Vg 2121 3-2 965

MAXIMUM

SHIPPING WEIGHT

lb kg Ft-in. mm Ft-in. mm

6-11V2

6-11 Vg

DIMENSIONS

A B

2121 3-5 1041

2121 3-2 965

Fig. 3 — Rigging Detaiis

HP m PLCS

0 ' ■ 3 T3S“^ Í

1993 I

STD UNIT

WEIGHT

UNIT

lb

48TJD,

1650 748 90 41 423 192 386 175 403 183 438 199 3-5 1041 3-5 1041 1-10 559

TJF016

48TJD,

1800 816 90 41 432 196 410 186 461 209 472 214 3-3 991 3-7 1092 1-8 508

TJF020

ECONOMIZER

kg

WEIGHT

lb

CORNERACORNERBCORNERCCORNER

lb

kg

lb

kg

NOTES:

1. Refer to print for roof curb accessory dimensions.

2. Dimensions in ( ) are in miiiimeters.

o 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.

• 4'-0" (1219) to combustible surfaces, all four sides (includes between

units).

• 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.

• Bottom: 14" (356) to combustible surfaces (when not using curb).

• Control box side; 3'-0" (914) to ungrounded surfaces, non-combustible.

• Control box side: 3'-6" (1067) to block or concrete walls, or other

grounded surfaces.

• Local codes 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 O'-s/ie" (8) on each side
for top cover drip edge.

lb

kg

Center of Gravity,

D

lb

kg

DIMA DIM B DIM C

ft-in. mm ft-in. mm ft-in. mm

kg

Fig. 4— Base Unit Dimensions; 48TJ016,020

SECTION A-A

TTP (41 PLCS^

0'-3 ?/8'

1 3/8* 8iA. 08AIM HOLE

STD UNIT

WEIGHT

UNIT

lb

48TJD,

1850 839 90 41 443 201 406 184 476 216 525 238 3-2 965 3-5 1041 1-8 508

TJF024
48TJD,

2000 907 90 41 471 214 428 194 526 239 574 260 3-2 965 3-5 1041 1-8 508

TJF028

ECONOMIZER

lb

kg

WEIGHT

CORNERACORNERBCORNERCCORNER

lb

kg

lb

kg

NOTES:

1. Refer to print for roof curb accessory dimensions.

2, Dimensions in ( ) are in millimeters.
3^ Center of Gravity.

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.

• 4'-0" (1219) to combustible surfaces, all four sides (includes between

units).
' 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.
' Bottom: 14" (356) to combustible surfaces (when not using curb).
' Control box side: 3'-0" (914) to ungrounded surfaces, non-combustible.

• Control box side: 3'-6" (1067) to block or concrete walls, or other

grounded surfaces.

• Local codes 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 O'-^/ie" (8) on each
side for top cover drip edge.

lb

kg

Direction of airflow.

DIMA DIM B DIMC

D

lb

kg

ft-in. mm ft-in. mm tt-in. mm

kg

Fig. 5 — Base Unit Dimensions; 48TJ024,028

SECTfON A-A

Table 1 — Physical Data

UNIT 48TJ

208/230, 460 V 1 575 V
NOMINAL CAPACITY (tons) 15 18 20 25
OPERATING WEIGHT (lb)

Economizer
Roof Curb

COMPRESSOR

Quantity...Model (Ckt 1, Ckt 2)
Number of Refrigerant Circuits

Oi!(oz)(Ckt1,Ckt 2)
Stages of Capacity Controi (%)

REFRiGERANTTYPE

Expansion Device
Operating Charge (Ib-oz)
Circuit 1*
Circuit 2

CONDENSER COIL

Rows...Fins/in.

Total Face Area (sq ft)

CONDENSER FAN

Nominal Cfm
Quantity...Diameter (in.)
Motor Hp...Rpm

Watts Input (Total)

EVAPORATOR COIL

Rows...Fins/in.

Total Face Area (sq ft)

EVAPORATOR FAM Centrifugal Type

Quantity...Size (in.) 2...10 X 10 2...10 X 10 2...12X 12 2...12 X 12 2...12X 12

Type Drive Belt Belt Belt Belt Belt

Nominal Cfm 6000 6000 7200 8000 10,000
Motor Hp 3.7 3.0 5 7.5 10
Motor Nominal Rpm 1725 1725 1745 1745 1740

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

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

Motor Bearing Type Ball Ball Ball Ball Ball
Maximum Allowable Rpm 1550 1550 1550 1550 1550
Motor Pulley Pitch Diameter Low-Medium Static 3.1/4.1 4.3/5,3 4.9/5.9 5.4/6.6 4,9/5.9

Min/Max (in.) High Static 3.7/4.7
Nomina! Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.) Low-Medium Static 6.0 6.4 9.4 9.4 8.0

Nominal Fan Shaft Diameter (in.)
Belt, Quantity..,Type...Length (in.) Low-Medium Static 1...BX...42 1...BX...45 1...BX...50 1...BX...54 2...BX...50

Pulley Center Line Distance (in.) 13.5-15,5 13.5-15,5 13.3-14.8 14.6-15.4 14,6-15.4
Speed Change per Full Turn of Low-Medium Static 48 44 37 37 36

Movable Pulley Flange (rpm)
Movable Pulley Maximum Full Turns

From Closed Position 5 5 5 5 5
Factory Speed 3.5 3,5 3.5 3.5 3.5
Factory Speed Setting (rpm) Low-Medium Static 1035 1296 1002 1120 1182

Fan Shaft Diameter at Pulley (in.)

LEGEND

Bhp ™ Brake Horsepower

TXV — Thermostatic Expansion Valve

Xircuit 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.

fRollout switch is manual reset.

High Static 1227-1550

High Static 5.2

High Static 1...BX...42

High Static 55

High Static 1389

016D/F

1650

90

200

2...SR’'942AE
2

90, 90

50/50

10-13 1 15-2 1 16-3 1 21-0

10-5 1 11-5 1 14-8 1 15-4

Cross-Hatched %-in. Copper Tubes, Aluminum Lanced,

2.,.17 1 3...15 1 3...15 I 4.,,15

21.7 1 21.7 1 21.7 1 21.7

10,400

3.. .22

f/2..,1050

1100

2...17 I 3...15 I 3...15 I

17.5 17.5 17.5

— — — — —

% Vh

1"/,6 13/16 1"/16 1"/i6

1"/i6 13/16 1^16 1 Vi 6 1 Vi6

Aluminum Pre-Coated, or Copper Plate Fins

Cross-Hatched ^/a-in. Copper Tubes, Aluminum Lanced or

—

_

—

—

—

—

"'"'The 48TJ028 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 48TJ016-028 units have a low-pressure switch (standard) located

on the suction side.

020D/F 024D/F 028D/F

1B00

90

200

Scr

1...SM120,

1...SRV82AE
2

110, 72

60/40

R-22
TXV

Propelle

9300

3...22

'/г...1050

1100

Copper Plate Fins, Face Split

1069-1287 1193-1458 1332-1550

4.9/5.9 5.4/6.6 4,9/5.9
1'/8 1% 13/8

8.0 7.9 6.4

1...BX...48 1..,BX,..50 2..,BX,..47

34 44 45

1178 1328 1470

1850

90

3ll

200

1.. .5M120,

1.. .5M110
2

110,110

52/48

r Type

13,700

2,,.30

1..,1075

3400

8.7 [208/230, 575 v]

9.5 [460 v[

1.. .5M161,

1.. .5M120

10.2 [208/230, 575 v[

11.8 [460 v]

2000

90

200

2

112, 110

56/44

12,500

2...30

1.,.1075

3400

4...15

17.5

1Vi6

Table 1 — Physical Data (cent)

FURNACE SECTION

Rollout Switch Cutout Temp (F)+ 190 190 190 190

Burner Orifice Diameter (in....drill size)

Natural Gas 0.1285...30/0.136...29 0.1285...30/0.136...29 0.1285...30/0.136...29 0.1285...30/0.136...29

Thermostat Heat Anticipator Setting (amps)

208/230, 575 Stage 1 0.98 0.98 0.98 0.98

460 V stage 1 0.80 0.80 0.80 0,80
Gas Input Stage 1 172,000/225,000 206,000/270,000 206,000/270,000 206,000/270,000
Efficiency (Steady State) {%) 81 81 81 81

Temperature Rise Range
Manifold Pressure (in. wg)

Natural Gas 3.3 3.3 3.3 3.3
Gas Valve Quantity 1 1 1 1
Field Gas Connection Size (in .-FPT)

HIGH-PRESSURE SWITCH (psig)

Cutout
Reset (Auto)

LOW-PRESSURE SWITCH (psig)

Cutout
Reset (Auto)

FREEZE PROTECTION THERMOSTAT (F)

Opens
Closes

OUTDOOR-AIR INLET SCREENS

Quantity...Size (in.)

RETURN-AIR FILTERS

Quantity...Size (in.)

POWER EXHAUST V2 Hp, 208/230-460 V Motor Direct Drive, Propeller-Fan (Factory-Wired for 460 v)

Bhp ™ Brake Horsepower
TXV — Thermostatic Expansion Valve

'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.

fRollout switch is manual reset.

UNIT 48TJ 016D/F 020D/F 024D/F 028D/F

Stage 2 0.44 0.44 0.44 0,44
Stage 2 0.44 0.44 0.44 0,44
Stage 2 230,000/300,000 275,000/360,000 275,000/360,000 275,000/360,000

15-45/20-50 15-45/20-50 15-45/20-50 15-45/20-50

3/4 3/4 3/4 3/4

__________________

__________________

LEGEND

**The 48TJ028 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 48TJ016-028 units have a low-pressure switch (standard) located
on the suction side.

426
320

27
44

30 ±5
45 ±5

Cleanable

2.. .20x25x 1

1.. .20x 20 x1
Throwaway*’'

4.. .20x20x2

4.. .16x20x2

step 3 — Field Fabricate Ductwork — Secure all

ducts to building stnjcture. Use flexible duct connectors be
tween unit and ducts as required. Insulate and weatlierproof 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.

Step 4 — Make Unit Duct Connections — Unit

is shipped for thra-the-bottom duct connections. Ductwork
openings are shown in Fig. 1, 4, and 5. Duct connections are
shown in Fig. 6. Field-fabricated concentric ductwork may be
connected as shown in Fig. 7 and 8. Attach all ductwork to roof
curb and roof cuit) basepans.

Step 5 — Install Flue Hood and Wind Baffle —

Flue hood and wind baffle are shipped secured under main
control box. To install, secure flue hood to access panel. See
Fig. 9. The wind baffle is then installed over the flue hood.

NOTE: When properly installed, flue hood will line up with
combustion tan housing. See Fig. 10.

Step 6 — Trap Condensate Drain — See Fig. 11

for drain location. One ^4-in. half coupling is provided inside

unit evaporator section for condensate drain connection. An

S'A-in. X ^4-in. diameter and 2-in. x diameter pipe nip
ple, coupled to standard V4-in. diameter elbows, provide a
straight path down through hole in unit base rtiils (see Fig. 12).

A trap at least 4-in. deep must be used.

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

water leak.

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

NOTE: Dimensions A, A', and B' are obtained trom field-supplied
ceiling diffuser.

I r| Shaded area indicates block-off panels.

Fig. 8 — Concentric Duct Details

AIR OUT AIR IN

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

water leak.

AIR OUT

Fig. 7 — Concentric Duct Air Distribution

INDUCED DRAFT
MOTOR

Step 7 — Orifice Change — This unit is factoiy as

sembled for heating operation using natural gas at an elevation
from sea level to 2000 ft. Tliis unit uses orifice type
LH32RFnnn, where “nnn” indicates the orifice size based on
drill size diameter in thousands of an inch.

HIGH ELEVATION (Above 2000 ft) — Use accessoiy high
altitude kit when installing tliis unit at an elevation of 2000 to
7000 ft. For elevations above 7000 ft, refer to Table 2 to identi
fy the correct orifice size for fhe elevafion. See Table 3 for the
number of orifices required for each unit size. Purchase these
orifices from your local Carrier dealer. Follow instmctions in
accessoiy Installation Instmctions to install the correct orifices.

Table 2 — Altitude Compensation*

COMBUSTION MAIN BURNER HEAT EXCHANGER
FAN HOUSING SECTION SECTION

Pig -|o — Combustion Fan Housing Location

Fig. 11 — Condensate Drain Details

(48TJ016 Shown)

ELEVATION (ft)

0-1,999 30 29

2,000 30 29
3,000 31 30
4,000 31 30
5,000 31 30
6,000 31 30
7,000 32 31
8,000 32 31
9,000 33 31

10,000 35 32

*As the height above sea level Increases, there is less oxygen per

cubic foot of air. Therefore, heat input rate should be reduced at
higher altitudes. Includes a 4% input reduction per each 1000 ft.

fOrifices available through your Carrier dealer.

NATURAL GAS ORIFICEf

Low Heat High Heat

Table 3 — Orifice Quantity

UNIT ORIFICE QUANTITY

48TJD016 5
48TJD020,

48TJD024,
48TJD028,
48TJF016

48TJF020,
48TJF024,
48TJF028

7

CONVERSION TO LP (Liquid Propane) GAS -- Use acces
soiy LP gas conversion kit when converting this unit for use
witli LP fuel usage for elevations up to 7000 ft. For elevations
above 7000 ft, refer to Table 4 to identify the correct orifice
size for tlie elevation. See Table 3 for the number of orifices
required for each unit size. Purchase these orifices from your
loctil Carrier dealer. Follow instmctions in accessoiy Installa
tion Instmctions to install the correct orifices.

Table 4 — LP Gas Conversion*

Fig. 12 — Condensate Drain Piping Details

ELEVATION (ft)

0-1,999 36

2,000 37
3,000 38
4,000 38
5,000 39
6,000 40
7,000 41
8,000 41
9,000 42

10,000 43

*As the height above sea level increases, there is less oxygen per

cubic foot of air. Therefore, heat input rate should be reduced at
higher altitudes. Includes a 4% input reduction per each 1000 ft.

fOrifices available through your Carrier dealer.

10

LP GAS ORIFICEf

step 8 — Install Gas Piping — Unit is equipped for

use with natui'iil gas. Installation must conform with local
building codes or. in the absence of lociil codes, with the
National Fuel Gas Code. ANSI Z22.3.1.

Install field-supplied manual gas shutoff valve with a Vs-in.
NPT pressure tap for test gage connection at unit. Field gas pip
ing must include sediment trap and union. See Fig. 1.1.

Transformer no. 1 is wired for 230-v unit. If 208/230-v unit

is to be nan with 208-v power supply, the transformer must be

rewired as follows:

1. Remove cap from red (208 v) wire,

2. Remove cap from orange (230 v) spliced wire.

3. Replace orange wire with red wire.

4. Recap both wires.

A WARNING

Do not pressure test gas supply while connected to unit.
Always disconnect union before servicing. Exceeding
maximum manifold pressure may cause explosion and
injuiy.

IMPORTANT: Natural gas pressure at unit gas connec

tion must not be less than 5.5 in. wg or greater than

1.3.5 in. wg.

Size gas-supply piping for 0.5-in. wg maximum pressure
drop. Do not use supply pipe smiillei' than unit gas connection.

MANUAL SHUTOFF

step 9 — Make Electrical Connections

FIELD POWER SUPPLY — Unit is factoiy wired for volt
age shown on nameplate.

When instiilling units, provide a disconnect per NEC (Na

tional Electrical Code) of adequate size (Table 5).

All field wiring must comply with NEC and local
requirements.

Route power ground lines through control box end panel or
unit basepan (see Fig. 4 and 5) to connections as shown on unit
wiring diagram and Fig. 14.

A CAUTION

Be certain unused wires are capped. Failure to do so may
damage the transformers.

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%.

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
accessoiy thermostat assembly according to installation in-

stmctions included with accessoiy. Locate thermostat assembly
on a solid interior wall in the conditioned space to sense aver
age temperature.

Route thermostat cable or equivalent single leads of

colored wire from subbase terminals through conduit in unit to

low-voltage connections as shown on unit label wiring diagram
and in Fig. 15.

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

Set heat anticipator settings as follows:

VOLTAGE W1 W2

208/230,575 0.98 0.44

460 0,80 0.44

Settings may be changed slightly to provide a greater degree

of comfort for a particulai' installation.

A CAUTION

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

A WARNING

Tlie unit must be electrically grounded in accordance with
local codes and NEC ANSl/NFPA 70 (National Fire Pro
tection Association) to protect against fire and electric
shock.

Field wiring must confirm to temperature limitations for
type “T’ wire. All field wiring must comply with NEC and lo
cal requirements.

LEGEND

EQUIP — Equipment
GND — Ground
NEC — National Electrical Code
TB — Terminal Block

NOTE: The maximum wire size for TB1 is 2/0.

Fig. 14 — Field Power Wiring Connections

11

OPTIONAL NON-FUSED DISCONNECT — On units with
the optional non-fused disconnect, incoming power will be
wired into the disconnect switch. Refer to Fig, 16 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 handle
and shaft aie shipped and packaged inside the unit control box.
Install the disconnect handle before unit operation. To install
the handle and shaft, perform the following procedure:

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

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

3. Insert the disconnect shaft into the sqiuu'e 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 tlie OFF
position, the handle will be horizontal.

7. Turn tlie handle to the OFF position and close the door.
Tlie 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
optiontil convenience outlet, a 115-v GFI (ground fault inter­rttpt) convenience outlet receptacle is provided tor field wiring.
Field wiring should be nm through the Vs-in. knockout pro
vided in the basepan near the return air opening.

THERMOSTAT ASSEMBLY

Fig. 15 — Field Control Thermostat Wiring

6T3 4T2 2Tl LOAD

#11®

■ “È

PI P

Pi

5L3 3L2 1L1 LINE

□ □ □

'^N N N

OHO

2 4 E

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

Fig. 16 — Optional Non-Fused Disconnect Wiring

12

Table 5 — Electrical Data

UNIT
48TJ

016

(15 Tons)

020

(18 Tons)

024

(20 Tons)

028

(25 Tons)

FLA — Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration

!FH/l ~ 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

'Fuse or HACR circuit breaker.

NOTES:

1. In compliance with NEC requirements for multimofor and combinafion load
equipmenf (refer fo 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 voltage Is
greater than 2%. Use the following formula to determine the percent of volt

age imbalance.
% Voltage Imbalance

too X

NOMINAL

VOLTAGE

(3 Ph, 60 Hz)

208/230 187 253 25.6 190 25.6 190 3 0.5 1.7 3.7 10.5/11.0

460 414 508 13.5 95 13.5 95 3 0.5 0.8 3.7 4.8

575 5f8 632 10.2 75 10.2 75 3 0.5 0.8 3.0 3.9

208/230 187 253 33 237 23 184 3 0.5 1.7 5.0 15,8/15.8

460 414 508 16.2 130 10.2 90 3 0.5 0.8 5.0 7.9

575 518 632 12.7 85 9 73 3 0.5 0.8 5.0 6,0

208/230 187 253 33 237 29.5 237 2 1 6.6 7.5 25.0/25.0

460 414 508 16.2 130 14.1 130 2 1 3.3 7.5 13.0

575 518 632 12.7 85 11.3 85 2 1 3.4 7.5 10.0

208/230 187 253 47.5 265 33 237 2 1 6.6 10.0 28.0/28.0

460 414 508 22.9 145 16.2 130 2 1 3.3 10.0 14.6

575 518 632 17.9 102 12.7 85 2 1 3.4 10.0 13.0

LEGEND

max voltage deviation from average voltage

VOLTAGE

RANGE

Min Max RLA LRA RLA LRA Qty

average voltage

COMPRESSOR

No. 1 No. 2

OFM IFM

FLA (ea)

Hp

Hp

Example: Supply voltage is 460-3-60.

ABC

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 = f 00 x

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

allowable 2%.

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

POWER

EXHAUST

COMBUSTION

FAN MOTOR

POWER

SUPPLY

FLA FLA LRA FLA MCA MOCP*

4,6 18.8 0.57 79/79 100/100

2.3 6.0 0.30 40 50

— — 0.57 30 35

2.1 4.8 0.57 32 40

— — 0.57 85/85 110/110

4.6 18.8 0.57 90/90 110/110
— — 0.30 41 50

2,3 6.0 0,30 43 50

— —

2,1 4.8 0.57 35 45

0.57 74/74 90/90

0.30 38 50

0.57 33 45

— — 0.57 109/109 125/125

4,6 18.8 0.57 114/114 125/125

— —

2,3 6.0 0.30 56 70

2.1 4.8 0.57 46 50

—

4.6 18.8 0.57 138/138 175/175

— —

2.3 6.0 0.30 68 90

— — 0.57 55 70

2,1 4.8 0.57 57 70

AB = 452 V
BC = 464 V
AC = 455 V

Average Voltage ;

= t .53%

0.30 54 70

0.57

0.57 134/134 175/175

0.30 66 80

452 + 464 + 455

f37f

= 457

7

457

44

50

13

step 10 — Make Outdoor-Air Inlet Adjust
ments

MANUAL OUTDOOR-AIR DAMPER ^ All units (except
those equipped with a factoiy-instiilled economizer) have a
manual outdoor-air damper to provide ventilation air.

Damper can be preset to admit up to 25% outdoor air into
return-£iir compartment. To adjust, loosen securing screws and
move damper to desired setting, tlien retighten screws to secure
diunper (see Fig. 17).

25% ADJUSTABLE
AIR DAMPER

SECURING SCREWS

Fig. 17

Standard 25% Outdoor-Air

Section Details

Step 11 — Install Outdoor-Air Hood

Fig. 18 — Outdoor-Air Hood Component Location

HOOD DRAIN
PAN

IMPORTANT: If the unit is equipped with the optional
EconoMi$eiTV, move the outdoor air temperature sensor
prior to installing the outdoor air hood. See the Optional
EconoMi$eiTV and EconoMi$er2 section for more details.

Tlie outdoor- air hood is common to 25% air ventilation and
economizer. If EconoMi$erIV is used, all electrical connec
tions have been made and adjusted at the factory. Assemble
and install hood in the field.

NOTE: Tlie hood top panel, upper and lower filter rettdners,
hood drain pan, baffle (size 024 and 028), and filter support
bracket iu'e secured opposite the condenser end of the unit. The
screens, hood side panels, remaining section of filter support
bracket, seal strip, and hai'dware 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, side panels, upper filter retain
er, and drain pan (see Fig. 20).

.2. Secure lower filter retainer and support bracket to unit.

See Fig. 20. Leave screws loose on size 024 and 028
units.

4. Slide baffle (size 024 and 028) behind lower filter retainer
and tighten screws.

5. Loosen sheet metal screws for top panel of base unit
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 top panel flange and unit.
Tighten screws.

7. Hold hood side panel flanges flat against unit, and instiill
screws removed in Step 5.

8. Inseit outdooi'-air inlet screens and spacer in channel cre
ated by lower filter retainer and filter support bracket.

BAFFLE

14

step 12 — Install All Accessories— install all

field-installed accessories. Refer to the accessoiy installation
instructions included with each accessoiy.

MOTORMASTER® I CONTROL INSTALLATION
(48TJ0I6,020 UNITS)

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. 21 for baffle
detiiils. Use 20-gage, galvanized sheet metal, or similar
coiTosion-resistant metal for baffles. Use field-supplied screws
to attach baffles to unit. Screws should be V4-in. diameter and
5/8-in. long. Drill required screw holes for mounting baffles.

A CAUTION

To avoid diunage 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. 21 — Wind Baffle Details

Install Motormaster I Controls — Only one Motormaster I
control is required per unit. Tlie Motormaster I control must be
used in conjunction with the Accessoiy 0° F Low Ambient Kit

(purchased separately). Tlie Motonnaster I device controls out
door fan no. I while outdoor fans no. 2 and ."5 are sequenced off
by the Accessoiy 0° F Low Ambient Kit.
Accessory 0° F Low Ambient Kit — Instiill the Accessoiy 0° F
Low Ambient Kit per instmction supplied with accessoiy.

Sensor Assembly — Install the sensor assembly in the location

shown in Fig. 22.
Motor Mount — To ensure proper fan height, replace the exist

ing motor mount with the new motor mount provided with
accessoiy.

Transformer (460 and 575-v Units Only) — On 460 and 575-v
units, a transfonner is required. The transformer is provided
with the accessoiy 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 protniding from bottom of extinsion.

0

îî°o

0 0

cp o

0 0

cp o

îi°°

cp 0

(b 0

cp 0

0 0

G) o

d) o

G) o cp o

® 0

d> 0

<p 0

îî ° 0

d> 0

(p 0

Î0 0

(p 0

cp 0 t p 0
cp o

SENSOR ­LOCATION

cp o

© 0

è 0

G) 0

0 0

G) o

© o

cb 0

îi°°

0 0

îi“°

G) o

îi°°

cp 0

îî°o

<p 0

G) 0

SENSOR
LOCATION

HAiRPIN END

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

48TJ016

----------

HAIRPIN END

ïh-

cp o

ih"

il»

cp 0

il»

cp 0

il»

cp o

il"

il»

tp 0

il»

cp 0

il»

cp 0

il»

cp 0

il»

il»

il»

cp 0

il»

cp 0

il»

cp o

il»

cp o

il»

tp 0

il»

cp 0

il»

48TJ020

Fig. 22 — Motormaster I Sensor Locations

15

MOTORMASTER® V CONTROL INSTALLATION
(48TJ024,028 UNITS)

Install Lield-Fabricated Wind Baffles — Wind baffles must
be field-fabricated for all units to ensure proper cooling cycle
operation at low ambient temperatures. See Fig. 21 for baffle
details. Use 20-gage, galvanized sheet metal, or similar coito-
sion-resistant metal for baffles. Use field-supplied screws to at
tach baffles to unit. Screws should be ‘A-in. diameter and
5/s-in. long. Drill required screw holes for mounting baffles.

A 0j|^||Y|Q||

To avoid dmnage to the refrigerant coils and electrical com
ponents, use recommended screw sizes only. Use cru'e
when diilling holes.

Install Motormaster V Controls — Tlie Motormaster V
(MMV) control is a motor speed control device which adjusts
condenser fan motor speed in response to declining liquid re
frigerant pressure. A properly applied Motormaster V control
extends the operating range of air-conditioning systems and
permits operation at lower outdoor ambient temperatures.

Tlie minimum iunbient temperatures at which the unit will

operate are:

TEMPERATURE OPERATING LIMÌTS — F°

standard Unit with Unit with

Unit Low Ambient Kit MMV Control

40 25 -20

To operate down to the ambient temperatures listed,
Motomiaster V controls (Fig. 23) must be added. Field-fabricat
ed and installed wind baffles iu'e also required for iill units (see
Fig. 21). The Motormaster V control permits operation of the
unit to an ambient temperature of-20 F. Tlie control regulates the
speed of 3-phase fan motors that aie compatible with the control.
Tliese motors are factoiy installed.

See Table 6 for the Motormaster V control accessoiy pack
age usage. Table 7 shows applicable voltages and motors.
Replacement of motor or fan blade IS NOT REQUIRED ON
CURRENT PRODUCTION UNITS since the control is
compatible with the factoiy-installed fan motors. Only field
wiring control is required

Install the Motormaster V control per instiuctions supplied
with accessoiy.

FR<3M FUSE BLOCK

Ó O Ò O Ó

U

TO PRESSURE^
TRANSDUCER

U L3

12 13Ai

I n io/-\

256

IflrtDfVÌÓnrTnhDnrvnfìDITri

/;n 7Î Î3 B-

O Q O O O

G

5

o

C E [3

TO MOTOR(S)

Fig. 23

Table 6 — Motormaster V Control Package Usage

UNIT VOLTAGE ITEM DESCRIPTION

48TJ024,028 460 CRLOWAÌVIB016A00

Table 7 — Applicable Voltages and Motors

VOLTAGE COMPATIBLE MOTOR

208/230-3-60 HD52AK654

460-3-60 HD52AK654
575-3-60 HD52GE576

Motormaster V Control

208/230 CRLOWAIVIB015A00

575 CRLOWAW1B017A00

16

step 13 — Adjust Factory-Installed Options

PREMIERLINKTM CONTROL — The PremierLink control
ler is available as a special order from the factoiy and is com
patible with the CiU'rier Comfort Network® (CCN) system.
This control is designed to allow usere the access and ability to
change factoiy-defmed settings, thus expanding the function of
the standard unit control board. Carrier’s diagnostic standard
tier display tools such as Navigator''^' device or Scrolling
Marquee can be used witli the PremierLink controller.

Tire PremierLink controller (see Fig. 24) requires the use of
a Cai'rier electronic themnostat or a CCN connection for time
broadcast to initiate its internal timeclock. This is necessaiy for
broadcast of time of day functions (occupied/unoccupied). No
sensors are supplied with the field-mounted PremierLink con
trol. The factoiy-installed PremierLink conti'ol includes only
the supply-air temperature (SAT) sensor and the outdoor air
temperature (OAT) sensor as standiu'd. An indoor air quality
(CO2) sensor can be added as an option. Refer to Table 8 for
sensor usage. Refer to Fig. 25 for PremierLink controller wir
ing. The PremierLink control may be mounted in the control
panel or an area below the control panel.

NOTE: PremierLink controller version 1.3 and later is shipped
in Sensor mode. If used with a thermostat, the PremierLink
controller must be configured to Thermostat mode.

Install the Supply Air Temperature (SAT) Sensor — When
the unit is supplied with a factoiy-mounted PremierLink con
trol, the supply-air temperature (SAT) sensor (33ZCSENSAT)
is factoiy-supplied and wired. The wiring is routed from the
PremierLink control over the control box, through a grommet.

into the fan section, down along the back side of the fan, and

along the fan deck over to the supply-air opening.

The SAT probe is wire-tied to tire supply-air opening (on the

horizontal opening end) in its shipping position. Remove the

sensor for installation. Re-position the sensor in the flange of

tire supply-air opening or in the supply air duct (as required by

local codes). Drill or punch a ‘/2-in. hole in the flange or duct.

Use two field-supplied, self-drilling screws to secure the sensor

probe in a horizontal orientation.

NOTE: The sensor must be mounted in tire dischiu'ge airstream
downstream of the cooling coil and any heating devices. Be

sure the probe tip does not come in contact with any of the unit

or heat surfaces.
Outdoor Air Temperature (OAT) Sensor — When the unit is

supplied with a factoiy-mounted PremierLink control, the
outdoor-air temperature sensor (OAT) is factoiy-supplied and
wired.

Install the Indoor Air Quality (CQt) Sensor — Mount the
optional indoor air quality (CO2) sensor according to manufac
turer specificiitions.

A sepiii'ate field-supplied transformer must be used to

power the CO2 sensor.

Wire the CO2 sensor to tlie COM and lAQI terminals of J5

on the PremierLink controller. Refer to the PremierLink Instal

lation, Start-up, and Configuration Instnictions for detailed
wiring and configuration information.

HVAC SENSOR INPUTS

SPACE TEMP

SET POINT ^

SUPPLY AIR TEMP

OUTDOOR TEMP

INDOOR AIR QUALITY

OUTDOOR AIR QUALITY

DUAL MODE SENSOR (STAT)

REMOTE OCCUPANCY (Q)

COMP SAFETY (Y1) ^

FIRE SHUTDOWN (Y2) ^

SUPPLY FAN STATUS (W1)

NOT USED (W2) ^

ENTHALPY STATUS (ENTH)

CCN/LEN

PORT

/

NAVIGATOR

PORT

4-2OMA INDOOR COMPR HEAT EXHAUST

ECONOMIZER FAN MOTOR 1&2 LOW/HIGH RVS VALVE

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

Fig. 24 — PremierLink Controller

X f M N N

OUTPUTS--------------------------------------------•-

17

*lt PremierLink control is in thermostat mode,

tTB2 terminal designations for 24 vac discrete inputs. Default is for DDC control.

Fig. 25 — PremierLink™ Controls Wiring

OAT
PL
SAT
SPT
TB

Outdoor Air Temperature Sensor
Plug
Supply Air Temperature Sensor
Space Temperature Sensor
Terminal Block

Table 8 — PremlerLinkT“ Sensor Usage

APPLICATION

Differential Dry Bulb

Temperature with

PremierLink*
(PremierLink

requires 4-20 mA

Actuator)

Single Enthalpy with

PremierLink*
(PremierLink

requires 4-20 mA

Actuator)

Differential Enthalpy

with PremierLink*

(PremierLink

requires 4-20 mA

Actuator)

“PremierLink control requires supply air temperature sensor 33ZCSENSAT and

outdoor air temperature sensor HH79NZ039 — included with factory-installed PremierLink control;

field-supplied and field-installed with field-installed PremierLink control.

NOTES:

1. CO2 Sensors (Optional):

33ZCSENC02 — Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.
33ZCASPC02 — Aspirator box used for duct-mounted CO2 room sensor.
33ZCT55C02 — Space temperature and C02 room sensor with override.
33ZCT56C02 — Space temperature and CO2 room sensor with override and setpoint.

2. All units include the following Standard Sensors:
Outdoor-air sensor — 50HJ540569 — Opens at 67 F, closes at 52 F, not adjustable.
Mixed-air sensor — HH97AZ001 — (PremierLink control requires supply air temperature sensor 33ZCSENSAT
and outdoor air temperature sensor HH79NZ039)
Compressor lockout sensor — 50FIJ540570 — Opens at 35 F, closes at 50 F.

OUTDOOR AIR

TEMPERATURE SENSOR

Included —
HH79NZ039

Included —

Not Used

Included —

Not Used

ENTHALPY SWITCH/RECEI VER -- Tlie accessoiy en
thalpy switcli/receiver (33CSENTHSW) senses temperature
and humidity of the ttir surrounding the device and calculates
the enthalpy when used witliout ttn entlitilpy sensor. The relay is
energized when enthalpy is high and deenergized when en
thalpy is low (based on ASHRAE [American Society of Heat
ing, Refrigeration and Air Conditioning Engineers] 90.1 crite
ria), If tin accessoiy enthtilpy sensor (33CSENTSEN) is at
tached to the return air sensor input, then differential enthalpy is
calculated. Tlie relay is energized when the enthalpy detected by
the return air enthalpy sensor is less than the entlialpy at tlie en
thalpy switch/receiver. The relay is deenergized when the en
thalpy detected by the return air enthalpy sensor is greater than
the enthalpy at the enthalpy switch/receiver (differential en
thalpy control). See Fig. 26 and 27.

OUTDOOR ENTHALPY CONTROL (Fig. 28) — Outdoor
enthalpy control requires only an enthalpy switcli/receiver
(33CSENTHSW). The enthalpy switcli/receiver is mounted in
the outdoor air inlet and calculates outdoor air enthalpy. The
enthalpy switch/receiver energizes the relay output when the
outdoor enthalpy is above 28 BTU/lb OR city bulb tempera
ture is above 75 F and is deenergized when the outdoor
enthalpy is below 27 BTU/lb

AND diy bulb temperature is

below 74.5 F. The relay output is wired to the unit economizer
which will open or close depending on the output of the
switch.

NOTE: The enthalpy calculation is done using an average alti
tude of 1000 ft above sea level.

RETURN AIR

TEMPERATURE SENSOR

Required —

33ZCT55SPT
or Equivalent

—

—

intake). Tlie enthalpy switch/receiver is not a NEMA 4
(National Electrical Manufacturers Association) enclosure and

should be mounted in a location that is not exposed to outdoor
elements such as rain or snow. Use two field-supplied no. 8 x
^/4-in. ТЕК screws. Insert the screws tlirough the holes in the

sides of the enthalpy switch/receiver.
Wiring — Сш'пег recommends the use of 18 to 22 AWG

(American Wire Gage) twisted pair or shielded cable for all
wiring. All connections must be made with Vq-in. female spade
connectors.

A 24-vac transformer is required to power the enthalpy
switch/receiver; as shown in Fig. 29, the PreniierLinkTM board
provides 24 vac. Connect the GND and 24 VAC terminals on

tlie enthalpy switcli/receiver to the terminals on the transfonn­er. On some applications, the power from the economizer har
ness can be used to power the enthalpy switcli/receiver. To

power tlie enthalpy switcli/receiver from the economizer har

ness, connect power of tlie enthalpy switcli/receiver to the red
and brown wires (1 and 4) on the economizer hiuness.

For connection to rooftop units with PremierLink'’'* control,

connect the LOW Enthalpy terminal on the enthalpy switch/re
ceiver to J4 — pin 2 of tlie PremierLink control on the HVAC
unit. The switch can be powered through tlie PremierLink con
trol board if desired. Wire the 24 VAC teniiinal on the entlialpy

switch/receiver to J4 — pin 1 on the PremierLink control. Wire

tlie GND terminal on the enthalpy switch/receiver to Jt —

pin 2 on the PremierLink control. The HI Enthalpy terminal is

not used. See Fig. 28.
Mounting — Mount the enthalpy switch/receiver in a location
where tlie outdoor air can be sampled (such as the outdoor air

OUTDOOR AIR

ENTHALPY SENSOR

— —

Required —

33CSENTHSW

(HH57ZC003)

or

HH57AC077

Required —

33CSENTHSW

(HH57ZC003)

or

HH57AC077

RETURN AIR

ENTHALPY SENSOR

—

Required —

33CSENTSEN

or

HH57AC078

19

4.253"

(108.03mmJ

4,253"

(1Q8.03mrn)

©

.251

(6.35mn>)

33CSENTHSW

mm

Hi LCW GNO

Eioafv

o

3 ™

3 "

Thermistor - Humidity Sensor

Fig. 26 — Enthalpy Switch/Receiver Dimensions

Mcdel«: HHSTZCO03

Pcwar: 24 VAC

Oajp«t: 10 AFona. IC

24 VAC Sourced Power

(95.25mm)

(33CSENTHSW)

33CSENTSEN

.25'

(8,36 mm)

3

3 ■

^ o:'

3 Oí

Thermistor

Modelé; HH5?ZC00l

Powe-: 24 to 36 VDC

0 to 50 BTÜ/S»

OuQkiI: 4 to 20 raA

3.75"

(95,25mm)

• Humidity Sensor

a

•fc- bi

o

3 ^
3 ■

Fig. 27 — Enthalpy Sensor Dimensions

(33CSENTSEN)

J3RV », JDRII
"e'RY^'^ red”

20

DIFFERENTIAL ENTHALPY CONTROL (Fig. 29) —
Differentiiil enthalpy control requires both an enthiilpy switch/
receiver (.33CSENTHSW) and an enthtJpy sensor
(33CSENTSEN), The enthalpy switch/receiver is mounted in
the outdoor air inlet and calculates outdoor air enthalpy. The
enthalpy sensor is mounted in the return airstream and ciilcu­lates the enth;ilpy of the indoor air.

Tire enthalpy switclr/receiver energizes the HI Enthalpy re
lay output when the outdoor enthalpy is greater tlran tire indoor
enthalpy. Tire LOW Entlralpy terminal is energized when the
outdoor entlralpy is lower than the indoor enthalpy. Tire relay
output is wired to the unit economizer which will open or close
depending on the output of the switch.

NOTE; Tire enthalpy calculation is done using an average alti
tude of 1000 ft above sea level.

Mounting — Mount the enthalpy switch/receiver in a location
where tire outdoor air can be sampled (such as the outdoor air
intitke). Tire enthalpy switch/receiver is not a NEMA 4 enclo
sure and should be mounted in a location that is not exposed to
outdoor elements such as rain, snow, or direct sunlight. Use
two field-supplied no. 8 x Yr-in. ТЕК screws. Insert the screws
through the holes in the sides of the enthalpy switclr/receiver.

Mount the enthalpy sensor in a location where the indoor air
can be siunpled (such as the return air duct). Tire enthalpy
sensor is not a NEMA 4 enclosure and should be mounted in a
location that is not exposed to outdoor elements such as rain or
snow. Use two field-supplied no. 8 x V4-in. ТЕК screws. Insert
the screws tlrrough the holes in tire sides of the enthalpy sensor.

Wiring — Carrier recommends the use of 18 to 22 AWG

twisted pair or shielded cable for all wiring. All connections
must be made with Vr-in. female spade connectors.

The PremierLink'f’'* board provides 24-vac to power the
enthalpy switch/receiver. Connect the GND and 24 VAC termi
nals on the enthalpy switclr/receiver to the terminals on
tire transformer. On some applications, tire power from the
economizer htu'ness can be used to power the enthalpy switch/
receiver. To power the enthalpy switch/receiver from the
economizer harness, connect power of the enthalpy switch/
receiver to the red and brown wires (1 and 4) on the econo
mizer harness.

Connect the LOW Enthalpy terminal on the enthalpy

switch/receiver to J4 — pin 2 of the PremierLink control on the
HVAC unit. The switch can be powered through the Premier
Link control board if desired. Wire tlie 24VAC terminal on the
enthidpy switcli/receiver to J4 — pin 1 on the PremierLink
control. Wire the GND terminal on the enthalpy switch/
receiver to J1 — pin 2 on the PremierLink control. The HI
Enthalpy terminal is not used. See Fig. 28.

Connect the 4-20 mA IN terminal on the enthalpy switch/
receiver to the 4-20 mA OUT terminal on the return air en­tlialpy sensor. Connect the 24-36 VDC OUT terminiil on the
enthalpy switcli/receiver to the 24-36 VDC IN terminal on the
return air enthalpy sensor. See Fig. 29.

Enthalpy Switch/Receiver Jumper Settings — There are two
jumpers. One jumper determines the mode of the entlialpy

switch/receiver. The other jumper is not used. To access the
jumpers, remove the 4 screws holding the cover on the
enthalpy switcli/receiver and then remove the cover. Tlie fac­toiy settings for the jumpers £U'e M1 and OFF.

The mode jumper should be set to M2 for differential en­tlialpy control. The factoiy test jumper should remain on OFF
or the enthalpy switch/receiver will not calculate enthalpy.

LEGEND

N/C — Normally Closed
N/O — Normally Open

120 VAC

LINE VOLTAGE

JUMPER SETTINGS FOR 33CSENTHSW

1°

о 11 о

I

ooo
ooo

JUMPER SETTINGS FOR 33CSENTSEN

0 О cn

^ о О о

1 -S? r-P

■ oo ■ ooo
Boo 1 ooo

Fig. 29 — Differential Enthalpy Control Wiring

21

Enthalpy Sensor Jumper Settings — There iii'e two jumpers.
One jumper determines the mode of the enthalpy sensor. The
otlier jumper is not used. To access the jumpers, remove the
4 screws holding the cover on the enthalpy sensor and then re
move the cover. The factory settings for the iumpers are M.3
and OFF.

Tlie mode jumper should be set to M.3 for 4 to 20 mA
output. Tlie factoiy test jumper should remain on OFF or the
enthalpy sensor will not calculate enthiilpy.

ENTHALPY SENSORS AND CONTROL The enthalpy
control (HH57AC077) is supplied as a field-installed accessoiy
to be used with the EconoMi$er2 damper control option. The
outdoor air enthalpy sensor is part of the enthalpy control. The
separate field-installed accessoiy return air enthalpy sensor
(HH57AC078) is required for differential enthalpy control.

NOTE: Tlie entlialpy control must be set to tire “D” setting for
differential entlialpy control to work properly.

Tlie enthalpy control receives tlie indoor and return
enthalpy from the outdoor and return air enthalpy sensoii; and
provides a diy contact switch input to the PremierLink'M
controller. Locate the controller in place of an existing econo
mizer controller or near the actuator. The mounting plate may
not be needed if existing bracket is used.

A closed contact indicates that outside air is preferred to the
return air. An open contact indicates that the economizer
should remain at minimum position.

Outdoor Air Enthalpy Sensor/Enthalpv Controller
(HH57AC077) — To wire the outdoor air enthalpy sensor,
perform the following (see Eig. .30 and .31):

NOTE: The outdoor air sensor can be removed from the back
of the enthiilpy controller and mounted remotely.

1, Lise a 4-conductor, 18 or 20 AWG cable to connect the

enthalpy control to the PremierLink controller and power
transformer.

2. Connect the following 4 wires from the wire hiu'ness
located in rooftop unit to the enthalpy controller:

a. Connect the BRN wire to the 24 vac terminal (TRl)

on enthalpy control and to pin 1 on 12-pin harness.

b. Connect the RED wire to the 24 vac GND terminal

(TR) on enthalpy sensor and to pin 4 on 12-pin
harness.

c. Connect the GRAY/ORN wire to J4-2 on Premier

Link controller and to terminal (.3) on enthalpy
sensor.

d. Connect the GRAY/RED wire to J4-1 on Premier

Link controller and to terminal (2) on enthalpy sensor.

NOTE: If installing in a Canier rooftop, use the two gray wires
provided from the control section to the economizer to connect
PremierLink controller to terminals 2 and 3 on enthiilpy sensor.

Return Air Enthalpy Sensor — Mount the return-air enthalpy
sensor (HH57AC078) in the return-air duct. Tlie return air
sensor is wired to the enthalpy controller (HH57AC077). The
outdoor enthiilpy changeover set point is set at the controller.

To wire the return air enthalpy sensor, perform the follow

ing (see Fig. 30):

1, Use a 2-conductor, 18 or 20 AWG, twisted pair cable to

connect the return air enthalpy sensor to the enthalpy
controller.

At the enthalpy control remove the factoiy-installed
resistor from the (SR) and (-I-) terminals.

Connect the field-supplied RED wire to (-I-) spade
connector on the return air enthalpy sensor and the (SR-i-)
terminal on the enthalpy controller. Connect the BLK
wire to (S) spade connector on the return air enthalpy

sensor and the (SR) terminal on the enthalpy controller.

NOTES:

1. Remove factory-installed jumper across SR and + before con
necting wires from return air sensor.

2. Switches shown in high outdoor air enthalpy state. Terminals 2
and 3 close on low outdoor air enthalpy relative to indoor air
enthalpy.

3. Remove sensor mounted on back of control and locate in out
side airstream.

Fig. 30 — Outdoor and Return Air Sensor Wiring

Connections for Differential Enthalpy Control

-BRACKET

HH57AC077
ENTHALPY
CONTROL AND

OUTDOOR AIR

ENTHALPY SENSOR

HH57AC078 ENTHALPY
SENSOR (USED WITH
ENTHALPY CONTROL
FOR DIFFERENTIAL
ENTHALPY OPERATION)

MOUNTING PLATE

Fig. 31 — Differential Enthalpy Control,

Sensor and Mounting Plate (33AMKITENT006)

22

OPTIONAL ECONOMISER!V AND ECONOMISER2 —
See Fig. 32 and 33 for EconoMiSerlV component locations.
See Fig. 34 for EconoMi$er2 component locations.

NOTE: These instinctions are for installing the optional
EconoMiSerlV and EconoMi$er2 only. Refer to the accessory
EconoMiSerlV or EconoMi$er2 installation instaictions when
field installing an EconoMiSerlV orEconoMi$er2 accessory.

To complete instiillation of the optional EconoMiSerlV, per

form the following procedure.

1. Remove the EconoMiSerlV hood. Refer to Step 11 — In
stall Outdoor-Air Hood on page 14 for infonnation on
removing and installing the outdoor-iiir hood.

2. Relocate outdoor air temperature sensor from shipping
position to operation position on EconoMiSerlV. See
Fig. 32.

IMPORTANT: F;iilure to relocate the sensor will result in
the EconoMiSerlV not operating properly.

OUTDOOR AIR

TEMPERATURE SENSOR

3. Reinstall economizer hood.

4. Install till EconoMiSerlV accessories. EconoMiSerlV
wiring is shown in Fig. 35. EconoMiSer2 wiring is shown
in Fig. 36.

Outdoor air leakage is shown in Table 9. Return £iir pressure

di'op is shown in Table 10.

Table 9 — Outdoor Air Damper Leakage

DAMPER STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0 1.2

LEAKAGE (cfm)

35 53 65 75 90 102

Table 10 — Return Air Pressure Drop (In. wg)

CFM

4500 5000 5400 6000 7200 7500 9000 10,000 11,250

0.040 0.050 0.060 0.070 0.090 0.100 0.110 0.120 0.140

SCREWS

Fig. 32 — EconoMiSerlV Component Locations ■

End View

SUPPLY AIR
TEMPERATURE SENSOR

Fig. 33 EconoMiSerlV Component Locations ■

Side View

Fig. 34 — EconoMISer2 Component Locations

23

LEGEND

DCV — Demand Controlled Ventilation
lAQ — Indoor Air Quality
LALS— Low Temperature Compressor

Lockout Switch

OAT — Outdoor-Air Temperature
POT — Potentiometer

Potentiometer Detault Settings:
Power Exhaust Middle
Minimum Pos,
DCV Max.
DCV Set
Enthalpy

Fully Closed
Middle
Middle
C Setting

Fig. 35 — EconoMI$erlV Wiring

NOTES:

1. 620 ohm, 1 watt 5% resistor should be removed only when using differential

enthalpy or dry bulb.

2. If a separate field-supplied 24 v transformer is used for the lAQ sensor power

supply, it cannot have the secondary of the transformer grounded.

3. For field-installed remote minimum position POT, remove black wire jumper
between P and PI and set control minimum position POT to the minimum
position.

OAT — Outdoor Air Temperature Sensor

NOTES:

1. Switch on actuator must be in run position for economizer to operate.

2. 50HJ540573 actuator consists of the 50HJ540567 actuator and a harness with 500-ohm resistor.

Fig. 36 — EconoMiSer2 Wiring

24

ECONOMISERIV STANDARD SENSORS
Outdoor Air Temperature (OAT) Sensor — The outdoor air

temperature sensor (HH57AC074) is a 10 to 20 mA device
used to measure the outdoor-air temperature. The outdoor-air
temperature is used to determine when the EconoMi$erIV can
be used for free cooling. Tire sensor must be field-relocated.
See Fig. 32. The operating range of temperature measurement
is 40 to 100 F.

Supply Air Temperature (SAT) Sensor — The supply air
temperature sensor is a 3 K tirennistor located at the inlet of the
indoor fan. See Fig. 33. This sensor is factoiy installed. The op
erating range of temperature measurement is 0° to 158 F. See
Table 11 for sensor temperature/resistance values.

Tire temperature sensor looks like an eyelet terminal with
wires innning to it. Tire sensor is located in the “crimp end”
and is settled from moisture.

Low Temperature Compressor Lockout Switch — The
EconoMi$erIV is equipped with an ambient temperature lock
out switch located in the outdoor airstretun which is used to
lockout the compressors below a 42 F ambient temperature.
See Fig. 32.

Table 11 — Supply Air Sensor Temperature/

Resistance Values

TEMPERATURE (F) RESISTANCE (ohms)

-58 200,250

_40

-22 53,010

-4 29,091

14 16,590

32 9,795
50 5,970
68 3,747
77 3.000

86 2,416
104 1,597
122 1,080

140 746

158 525
176 376
185 321
194 274
212 203
230 153
248 116
257 102
266 89
284 70
302 55

100,680

ECONOMf$ERIV CONTROL MODES

IMPORTANT: Tire optiontil EconoMi$er2 does not include
a controller. Tire EconoMi$er2 is operated by a 4 to 20 mA
signal from an existing field-supplied controller (such as
PremierLink'*''* control). See Pig. 36 for wiring infonnation.

Detennine the EconoMi$erlV control mode before set up of
the control. Some modes of operation may require different sen
sors. Refer to Table 12. The EconoMi$erl V is supplied from the
factoiy with a supply air temperature sensor, a low temperature
compressor lockout switch, and an outdoor air temperature
sensor. TIris allows for operation of the EconoMi$erTV with
outdoor air diy bulb changeover control. Additional accesso
ries can be added to ttllow for different types of changeover
control and operation of the EconoMi$er!V and unit.

Table 12 — EconoMI$erlV Sensor Usage

ECONOMISERIV WITH OUTDOOR AIR

APPLICATION

Outdoor Air

Dry Bulb

Differential Dry Bulb CRTEMPSN002A00*

Single Enthalpy HH57AC078

Differential Enthalpy

CO2 tor DCV Control

using a Wall-Mounted

CO2 Sensor

CO2 for DCV Control

using a Duct-Mounted

CO2 Sensor

’CRENTDIF004A00 and CRTEMPSN002A00 accessories are used on

many different base units. As such, these kits may contain parts that

will not be needed for installation.

t33ZCSENC02 is an accessory CO2 sensor.

**33ZCASPC02 is an accessory aspirator box required for duct-

mounted applications.

tfCRCBDIOXOOSAOO is an accessory that contains both 33ZCSENC02

and 33ZCASPC02 accessories.

33ZCSENC02f

33ZCASPC02**

Outdoor Diy Bulb Changeover — The standard controller is

shipped from the factoiy configured for outdoor diy bulb

changeover control. The outdoor air and supply air temperature

sensors tU'e included as standai'd. Por this control mode, the

outdoor temperature is comptiied to an adjustable set point se

lected on the control. If the outdoor-air temperature is above
tlie set point, tlie EconoMi$erIV will adjust the outdoor-air
dampers to minimum position. If the outdoor-air temperature is
below tlie set point, the position of the outdoor-air dampers will
be controlled to provide free cooling using outdoor tdr. When

in this mode, the LED next to the free cooling set point potenti
ometer will be on. The changeover temperature set point is
controlled by the free cooling set point potentiometer located
on the control. See Pig. 37. The settle on the potentiometer is A,
B, C, and D. See Fig. 38 for the corresponding temperature
changeover values.

Differential Dry Bulb Control — For differential diy bulb
control tire standard outdoor diy bulb sensor is used in conjunc
tion with an additional accessoiy return air sensor (part number
CRTEMPSN002A00). The accessoiy sensor must be mounted

in the return airstream. See Fig. 39.

In this mode of operation, the outdoor-air temperature is
compared to the return-air temperature and the lower tempera
ture airstream is used for cooling. When using this mode of
changeover control, turn tlie free cooling/enthalpy set point

potentiometer fully clockwise to the D setting. See Fig. 37.

EXHAUST

FAN SETPOINT

LED LIGHTS

WHEN EXHAUST

CONTACT IS MADE

Ml

NIMUM DAMPER-----------------—-ЛИИ

iSITIOM SETTING -fat—рША-,

POSITION SETTING

MAXIMUM DAMPER
DEMAND CONTROL

VENTILATION SETPOINT

LED LIGHTS WHEN

DEMAND CONTROL

VENTILATION INPUT

IS ABOVE SET POINT

DEMAND CONTROL

VENTILATION SETPOINT

LED LIGHTS WHEN

OUTDOOR AIRIS

SUITABLE FOR

FREE COOLING

FREE COOLING/ENTHALPY

CHANGEOVER SET POINT

Fig. 37 — EconoMi$erlV Controller Potentiometer

and LED Locations

DRY BULB SENSOR

Accessories Required

None. The outdoor air dry bulb sensor

is factory installed.

HH57AC078

and

CRENTDIF004A00*

33ZCSENC02

and

GC

CRCBDIOX005A00tt

0

Ik

'O

25

Fig. 38 — Outside Air Temperature

Changeover Set Points

Outdoor Enthalpy Changeover — For enthalpy control, ac­cessoiy enthalpy sensor (part number HH57AC078) is
required Replace the stanckird outdoor diy bulb temperature
sensor with the accessoiy entlialpy sensor in the same mount
ing location. See Fig. 32. When the outdoor iiir enthalpy rises
above the outdoor enthiilpy changeover set point, the outdoor­air damper moves to its minimum position, Tlie outdoor
enthalpy changeover set point is set with the outdoor enthalpy
set point potentiometer on the EconoMi$erIV controller. The
set points are A, B, C, and D. See Fig. 40. Tlie factory-installed
620-ohm jumper must be in place across terminals SR and SR-i
on the EconoMi$er[V controller. See Fig. 32 and 41.

Differential Enthalpy Control — For differential enthalpy
control, the EconoMi$eiTV controller uses two enthalpy sen
sors (HH57AC078 and CRENTDIF004A00), one in the out
side air and one in the return airstream or the EconoMiSerlV
tfiune. The EconoMi$eiTV controller compares the outdoor air
enthalpy to the return air enthalpy to determine ExonoMi$eiTV
use, Tire controller selects the lower enthalpy air (return or out
door) for cooling. For example, when the outdoor air has a low
er enthalpy than the return air and is below the set point, the
EconoMi$erIV opens to bring in outdoor air for free cooling.

Replace the standard outside aii' diy bulb temperature sen
sor with the accessoiy enthalpy sensor in the same mounting
location. See Fig. 32, Mount the return air enthalpy sensor in
the return airstream. See Fig. 39. The outdoor enthalpy
changeover set point is set with the outdoor enthalpy set point
potentiometer on the EconoMi$eiTV controller. When using
this mode of changeover control, turn the enthalpy set point
potentiometer fully clockwise to the D setting.

NOTE: Remove 620-ohm resistor if differential entlialpy sen
sor is installed.

Indoor Air Quality (IAO) Sensor Input — The lAQ input
can be used for demand control ventilation control based on the
level of CO2 measured in the space or return air duct.

Mount the accessoiy lAQ sensor according to manufacturer
specifications. The lAQ sensor should be wired to the AQ and
AQl terminals of the controller. Adjust the DCV potentiome
ters to correspond to the DCV voltage output of the indoor air
quality sensor at the user-determined set point. See Fig. 42,

If a separate field-supplied transformer is used to power the
lAQ sensor, the sensor must not be grounded or the
EconoMi$erIV control botii'd will be damaged.

Exhaust Set Point Adjustment — The exhaust set point will
determine when the exhaust fan luns based on dtimper position
(if accessoiy power exhaust is installed). Tlie set point is modi
fied with the Exhaust Fan Set Point (EXH SET) potentiometer.
See Fig. 37. The set point represents tlie damper position above
which the exhaust fan will be turned on. When there is a
ciill for exhaust, the EconoMi$erfV controller provides a

SENSOR

Fig. 39 — Return Air Temperature or
Enthalpy Sensor Mounting Location

45 ± 15 second delay before exhaust fan activation to allow the
dampers to open. This delay allows the damper to reach the
appropriate position to avoid unnecessaiy fan overload.

Minimum Position Control — There is a minimum damper
position potentiometer on tlie EconoMiSerlV controller. See
Fig. 37. The minimum diunper position maintains tlie mini
mum aiiflow into the building during the occupied period.

When using demand ventilation, the minimum damper po
sition represents the minimum ventilation position for VOC
(volatile organic compound) ventilation requirements. Tlie
maximum demand ventilation position is used for fully occu
pied ventilation.

When demand ventilation control is not being used, the
minimum position potentiometer should be used to set the oc
cupied ventilation position. Tlie maximum demand ventilation
position should be turned fully clockwise.

Adjust the minimum position potentiometer to iillow the
minimum amount of outdoor air, as required by local codes, to
enter the building. Make minimum position adjustments with
at least 10° F temperature difference between the outdoor and
retum-air temperatures.

To determine the minimum position setting, peidbrin the

following procedure:

1. Calculate the appropriate mixed-air temperature using the
following formula:

(Tox

OA

■) -I- (TR X

100 " ' 100

RA

) = Tm

To = Outdoor-Air Temperature
O A = Percent of Outdoor Air

Tr = Return-Air Teinperature

RA = Percent of Return Air

Tm = Mixed-Air Temperature

As an example, if local codes require 10% outdoor air
during occupied conditions, outdoor-air temperature is
60 F, and retum-air temperature is 75 F.

(60 X . 10) -r (75 X .90) = 73.5 F

26

85 90 95 100 105 110

(29) (32) (35) (38) (41) (43)

APPROXIMATE DRY BULB TEMPERATURE— °F fC)

Fig. 40 — Enthalpy Changeover Set Points

6000

5000

4000

3000

2000

1000

■HIGH LIMIT

CURVE

CO2 SENSOR MAX RANGE SETTING

Fig. 41 — EconoMi$erlV Controller

2 3 4 5 6 7 8

DAMPER VOLTAGE FOR MAX VENTILATION RATE

Fig. 42 — CO2 Sensor Maximum Range Setting

27

2. Disconnect the supply-air sensor from termintils T and
Tl.

3. Ensure that tire factoiy-installed jumper is in place across
terminals P and PI. If remote damper positioning is being
used, make sure that tire tenninals are wired according to
Fig. 35 and that the irrinimuirr position potentiometer is
turned fully clockwise.

4. Connect 24 vac across tenninals TR and TRl.

5. Carefully adjust the minimum position potentiometer
until the measured mixed-air temperature matches the
calculated value.

6. Reconnect the supply-air sensor to tenninals T and Tl.

Remote control of the EconoMi$erIV damper is desirable
when requiring additional temporaiy ventilation. If a
field-supplied remote potentiometer (Honeywell part number
S963B1128) is wired to the EconoMi$erIV controller, the min
imum position of the damper can be controlled from a remote
location.

To control the minimum damper position remotely, remove
the factoiy-installed jumper on the P and PI terminals on the
EconoMi$erIV controller. Wire tire field-supplied potentiome
ter to the P and PI terminals on the EconoMi$erIV controller.
See Fig. 41.

Damper Movement — Damper movement from full open to
full closed (or vice veraa) tiikes 2'/2 minutes.

Thermostats — Tfie EconoMi$erIV control works with con
ventional thermostats that have a Y1 (cool stage 1), Y2 (cool
stage 2), W1 (heat stage 1), W2 (heat stage 2), and G (fan). The
EconoMi$eiTV control does not support space temperature
sensora. Connections are made at the thermostat terminal con
nection board located in the main control box.

Occupancy Control — Tire factoiy default configuration for
the EconoMiSerlV control is occupied mode. Occupied status
is provided by the red jumper from terminal 9 to terminal 10 on
TB2. When unoccupied mode is desired, install a field­supplied timeclock function in place of the jumper between ter
minals 9 and 10 on TB2. See Fig. 35. When the timeclock
contacts ai'e closed, tire EconoMiSerfV control will be in
occupied mode. When the timeclock contacts are open (remov
ing the 24-v signal from terminal N), the EconoMi$erIV will
be in unoccupied mode.

Demand Controlled Ventilation (DCV) — When using the
EconoMi$erIV for demand controlled ventilation, there tu'e
some equipment selection criteria which should be considered.

When selecting the heat capacity and cool capacity of the

equipment, the maximum ventilation rate must be evaluated for
design conditions. The maximum damper position must be ciil­culated to provide the desired fresh air

Typically tlie maximum ventilation rate will be about 5 to

10% more than the typical cfm required per pereon, using

normal outside air design criteria.

A proportional anticipatoiy strategy should be taken with
the following conditions: a zone with a large area, varied occu
pancy, and equipment that cannot exceed the required ventila
tion rate at design conditions. Exceeding the required ventila
tion rate means the equipment can condition air at a maximum
ventilation rate that is greater than the required ventilation rate
for maximum occupancy. A propoitional-anticipatoiy strategy
will cause tlie fresh air supplied to increase as the room CO2
level increases even though the CO2 set point has not been
reached. By the time the CO2 level reaches the set point, the
damper will be at maximum ventilation and should msiintain
the set point.

In order to have the CO2 sensor control the economizer
diunper in this manner, first detemiine tlie damper voltage out
put for minimum or base ventilation. Base ventilation is the

ventilation required to remove contaminants during unoccu
pied periods. The following equation may be used to determine
the percent of outside-air entering the building for a given
damper position. For best results there should be at least a

10 degree difference in outside and return-air temperatures.

(Tox ^"^-) -H(TRx-®^^

100 100

) = Tm

To = Outdoor-Air Temperature
OA = Percent of Outdoor Air

Tr = Return-Air Temperature

RA = Percent of Return Air

Tm = Mixed-Air Temperature

Once base ventilation has been determined, set the mini

mum damper position potentiometer to the correct position.

Tlie same equation can be used to detennine the occupied or
maximum ventilation rate to the building. For example, an out
put of 3.6 volts to the actuator provides a base ventilation rate
of 5% and an output of 6.7 volts provides the maximum venti
lation rate of 20% (or base plus 15 cfm per person). Use Fig. 42
to detennine the maximum setting of tlie CO2 sensor. For ex
ample, a 1100 ppm set point relates to a 15 cfm per person de
sign. Use the 1100 ppm curve on Fig. 42 to find the point when
the CO2 sensor output will be 6.7 volts. Line up the point on the
graph with the left side of the chart to determine that the range
configuration for the CO2 sensor should be 1800 ppm. The
EconoMi$erIV controller will output the 6.7 volts from the

2 sensor to the actuator when the CO2 concentration in the

CO
space is at 1100 ppm. Tire DCV set point may be left at 2 volts
since the CO2 sensor voltage will be ignored by the
EconoMi$erIV controller until it rises above the 3.6 volt setting
of the minimum position potentiometer.

Once the fully occupied diunper position has been deter
mined, set tire maximum danper demand control ventilation
potentiometer to this position. Do not set to the maximum posi
tion as this can result in over-ventilation to the space and poten
tial high-humidity levels.

CQt Sensor Configuration — The CO2 sensor has preset
standard voltage settings tirat can be selected anytime after the
sensor is powered up. See Table 13.

Use setting 1 or 2 for Carrier equipment. See Table 13.

1. Press Clear and Mode buttons. Hold at least 5 seconds
until the sensor enters the Edit mode.

2. Press Mode twice. Tlie STDSET Menu will appear.

3. Use tlie Up/Down button to select the preset number. See
Table 1.3.

4. Press Enter to lock in tlie selection.

5. Press Mode to exit and resume normal operation.

Tlie custom settings of the CO2 sensor can be changed any
time after the sensor is energized. Follow the steps below to
change tlie non-standard settings:

1. Press Clear and Mode buttons. Hold at least 5 seconds
until the sensor enters the Edit mode.

2. Press Mode twice. Tlie STDSET Menu will appear.

3. Use the Up/Down button to toggle to the NONSTD menu
and press Enter.

4. Use the Up/Down button to toggle through each of the
nine variables, starting with Altitude, until tlie desired set
ting is reached.

5. Press Mode to move through the variables.

6. Press Enter to lock in the selection, then press Mode to
continue to the next viuiable.

28

Table 13 — CO2 Sensor Standard Settings

SETTING EQUIPMENT OUTPUT

1

Interface with Standard

2 Proportional Any

Building Control System

3 Exponential Any

4

5 Proportional 20

Economizer

6 Exponential 15

7 Exponential 20

8 Health & Safety Proportional

Parking/Air Intakes/

9

Loading Docks

LEGEND

ppm — Parts Per Million

Proportional Any

Proportional 15

Proportional

VENTILATION

RATE

(cfm/Person)

—

—

Dehumidification of Fresh Air with DCV Control — Infor
mation from ASHRAE indicates that the largest humidity load
on any zone is the fresh air introduced. For some applications,
a field-installed energy recovery unit can be added to reduce
the moisture content of tire fresh air being brought into the
building when tire enthalpy is high. In most cases, the normal
heating and cooling processes are more than adequate to re
move the humidity loads for most commercial applications.

If normal rooftop heating and cooling operation is not ade
quate for the outdoor humidity level, an enei'gy I'ecoveiy unit
and/or a dehumidification option should be considei'ed.

ANALOG

OUTPUT

0-1 ov

4-20 mA

2-1 OV

7-20 mA

0-1 OV

4-20 mA

0-1 OV

4-20 mA

0-1 OV

4-20 mA

0-1 OV

4-20 mA

0-1 OV

4-20 mA

0-1 OV

4-20 mA

0-1 OV

4-20 mA

CO2

CONTROL RANGE

(ppm)

0-2000 1000 50

0-2000 1000 50

0-2000 1100 50

0-1100 1100 50

OPTIONAL

RELAY SETPOINT

(ppm)

0- 900 900 50

0-1100 1100 50

0- 900 900 50

0-9999 5000 500

0-2000 700 50

RELAY

HYSTERESIS

(ppm)

Step 14 — Install Humidistat for Optional
MoistureMi$er’^'^ Package — MoistuieMi$er dehu

midification package operation can be controlled by field in

stallation of a CaiTiei'-approved humidistat. To install the humi

distat 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 wir'e from Humidistat terminals through conduit in
unit to the low voltage connection on the 2-pole terminal
strip (TB3) as shown in Fig. 4.3 and Fig. 44. See Fig. 45
for operational diagram.

29

Fig. 43 — Typical MolstureMISer’'“ Dehumidificatlon Package

Humidlstat Wiring Schematic (460 V Unit Shown)

Fig. 44 — Typical MoistureMi$er Dehumidificatlon

Package Control Box

30

SUCTION

S-LPS
SUB COOLER CONTROL
LOW PRESSURE SWITCH

EQUALIZER LINE

TXV — Thermostatic Expansion Valve

CONDENSER CO!L

Fig. 45 — MoistureMiSer’^“ Dehumidification Package Operation Diagram

START-UP

Use the following infoniiation and Stait-Up Checklist on

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

Unit Preparation — Check that unit has been installed in

accordance with these installation instinctions and all applica
ble codes.

COMPRESSOR MOUNTING — Do not loosen or remove
compressor holddown bolts.

REFRIGERANT SERVICE PORTS — Each refrigerant sys
tem has a total of 3 Schrader-type service gage ports. One port
is located on tlie suction line, one on the compressor discharge
line, and one on the liquid line. In addition Schrader-type
valves are located underneath tlie low-pressure switches. Be
sure that caps on the ports are tight.

COMPRESSOR ROTATION
48TJ016 and 020 Only — The unit is equipped with a Phase

Monitor Relay (PMR) board located in the control box. The
PMR device will not allow the unit to nm if field power is con
nected incorrectly. To determine if the Phase Monitor Relay is
preventing the unit from starting, check to see if the red LED is
blinking. If tlie LED is blinking, the 3-phase field power has
been wired incorrectly. A solid light means that field power
connections are correct.

48TJ024 and 028 Only — It is important to be certain the
compressors are rotating in the proper direction. To determine
whether or not compressoi's are rotating in the proper direction:

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 tlie unit.

3. Reverse any two of the incoming power leads.

4. Turn on power to the unit.

5. Energize each compressor.
The suction and discharge pressure levels should now move

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

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

After a few minutes of reverse operation, the scroll com

pressor interniJ overload protection will open, which will acti
vate the unit's lockout and requires a manual reset. Reset is

accomplished by turning the thermostat on and off.
INTERNAL WIRING — Check all electrical connections in

unit control boxes; tighten as required.
CRANKCASE HEATER (SIZE 028 AND UNITS WITH

MOISTUREMISER'M DEHUMIDIFICATION PACKAGE
ONLY) — Crankcase heater(s) is energized as long as there is

power to the unit and the compressor is not operating.

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

EVAPORATOR FAN — Fan belt and vtuiable pulleys are

factoiy-installed. Remove tape from the fan pulley. See

Tables 14-19 for fan performance data. Be sure that fans rotate

in the proper direction. See Table 20 for air quantity limits. See
Tables 21-23 for static pressure information for accessoiles and
options. See Table 24 for fan rpm at motor pulley settings. See
Tables 25 and 26 for evaporator-fan motor data and evaporator

fan motor efficiency. To alter fan performance, see Evaporator
Fan Performance Adjustment section on page 40.

NOTE: A 3'/2-in. bolt and threaded plate are included in the

installer’s packet for 48TJ020-028 units. They can be added to
tlie motor support channel below the motor mounting plate to
£iid in raising the fan motor.

31

Table 14 — Fan Performance — 48TJD016 (Low Heat Units)

AIHFLOW

(cfm)

4500 809 1.53 1317 906 1.74 1502 994 1.96 1690 1078 2.18 1882 1156 2.41 2077 1230 2.64 2275
4800 850 1.76 1516 942 1.98 1706 1027 2,20 1899 1107 2.43 2094 1183 2.66 2293 1255 2.89 2495
5100 892 2.01 1733 979 2.24 1928 1061 2.46 2125 1138 2.70 2325 1211 2.93 2528 1281 3.17 2733
5400 934 2.28 1970 1017 2.52 2169 1096 2.75 2371 1170 2.99 2575 1241 3.22 2781 1309 3.47 2990
5700 976 2.58 2225 1058 2.82 2429 1132 3.06 2635 1204 3.30 2843 1272 3.54 3053 1338 3.79 3266
6000 1019 2.90 2500 1096 3.14 2709 1168 3.38 2919 1238 3.63 3131 1304 3.88 3345 1368 4.13 3562
6300 1063 3.24 2795 1136 3.49 3008 1206 3.74 3223 1273 3.99 3439 1337
6600 1106 3.61 3111 1177 3.86 3329 1244 4.11 3547 1309 4.37 3767
6900
7*5 fin

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

1150 4.00 3448 1218 4.26 3670

7500 — — — — — — — — — — — — — — — — — —

AIRFLOW

(cfm)

4500 1301 2.87 2477 1369 3.11 2683 1434 3.35 2891 1497 3.47 2997 1497 3.60 3103
4800 1324 3.13 2700 1390 3.37 2909 1454 3.62 3120 1515 3.74 3226 1515 3.87 3334
5100 1349 3.41 2942 1413 3.66 3153 1475 3.90 3367 1535 4.03 3475 1535 4.16 3584
5400 1374 3.71 3202 1437 3.96 3416 1498 4.21 3633
5700
6000
6300

nRfin
6900

7200
7500

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

1402 4.04 3481 1463 4.29 3699

— —

—

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

— —

—

LEGEND

Bhp — Brake Horsepower

Flop — Factory-Installed Option

Watts — Input Watts to Motor

NOTES:

1, Standard low-medium static drive range is 891 to 1179 rpm (for 208/230

and 460-v units) or 1159 to 1429 rpm (for 575-v units). Alternate high­static drive range is 1227 to 1550 (for 208/230 and 460-v units). The
alternate high-static drive is not available for 48TJ016 575-v units. Other

rpms require a field-supplied drive.

2. Maximum continuous bhp is 4.25 (208/230 and 460 v) or 3.45 (575 v)
and the maximum continuous watts are 3775 (208/230 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.

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

4 24

—

3657

— —

— —
—

— — — — — — — — — — — —

— — —

_

—

—

— — — —

—

— — — —

3. Static pressure losses (i.e., economizer) must be added to external static

4. Interpolation is permissible. Do not extrapolate.

5. Fan performance is based on wet coils, clean filters, and casing losses.

6. Extensive motor and drive testing on these units ensures that the full

7. Use of a field-supplied motor may affect wiring size. Contact your Carrier

pressure before entering Fan Performance table.

See Tables 21-23 for accessory/FlOP static pressure information.

horsepower and watts range of the motor can be utilized with confi
dence. Using 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.

representative for details.

— — —

_ _ _

— — —

— —

—

Table 15 — Fan Performance — 48TJD020 and 024 (Low Heat Units)

AIHFLOW

(cfm)

5,500 755 2.27 1908 831 2.58 2171 901 2.91 2443 968 3,24 2723 1031 3.58 3009 1091 3.93 3302

6,000 810 2.72 2287 881 3.04 2556 947 3.37 2833 1010 3.71 3116 1070 4.05 3406 1127 4.40 3702

6,500 866 3.22 2710 932 3.55 2985 994 3.88 3266 1054 4.23 3554 1111 4.57 3847 1166 4.93 4146
7,000 923 3.78 3177 985 4.11 3458 1044 4.45
7,500 980 4.39 3690 1038 4.73 3976 1094 5.07 4267 1148 5.43 4564 1200 5.78 4864 1250 6.15 5170

8,000 1038 5.06 4251 1093 5.40 4542 1146 5.75 4838 1197 6.11 5138 1246 6.47 5443 1294 6.84 5752

8,500 1096 5,78 4859 1148 6.13 5156 1198 6.49 5456 1247 6,85 5761 1294 7.22 6070 1340 7.59 6382
9,000 1154 6,56 5517 1204 6.92 5818 1251 7.28 6123 1298 7.65 6432 1343 8.02 6745 1388 8.40 7062
9,500 1213 7,40 6224 1260 7.77 6531 1306 8.13 6840 1350 8.51 7154 1394 8.88 7471 1436 9.26 7791

10,000 1272 8.30 6983 1317 8.67 7294 1360 9.05 7608 1403 9.43 7926 1445 9.81 8247 1486 10.19 8570

AIRFLOW

(cfm)

5,500 1149 4.28 3602 1204 4.65 3907 1258 5.02 4217 1284 5.20 4375 1309 5.39 4533
6,000 1183 4.76 4003 1236 5.13 4310 1288 5.50 4622 1313 5.68 4780 1337 5.87 4939
6,500 1219 5.29 4450 1270 5.66 1459 1320 6.03 5073 1344 6.22 5232 1368 6.41 5391
7,000 1258 5,88 4942 1307 6.25 5253 1355 6.62 5569 1378 6.81 5729 1402 7.00 5890
7,500 1299 6.52 5480 1346 6.89 5794 1392 7.27 6113 1415 7.46 6273 1437 7.65 6435
8,000 1341 7.21 6065 1387 7.59 6383 1392 7.97 6704 1453 8.16 6866 1475 8.36 7028
8,500 1385 7.97 6699 1429 8.35 7019 1472 8.73 7343 1493 8.93 7506 1514 9.12 7670
9,000 1431 8.78 7382 1473 9.15 7705 1515 9.55 8032 1535 9.75 8196
9,500 1478 9.65 8114 1519 10.04 8441

10,000

0.2 0.4 0.6 0.8 1.0 1.2

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Walts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

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

— — — — — — — — — — — —

LEGEND

Bhp — Brake Horsepower
Flop — Factory-Installed Option

Watts — Input Watts to Motor

NOTES:

1. 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.

2. 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 (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 (460 v). Do not

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

3744

1100 4.80 4036 1155 5.15 4333 1207 5.51 4635

— — — — — — — — —

adjust motor rpm such that motor maximum bhp and/or watts is
exceeded at the maximum operating cfm.

3. Static pressure losses (i.e., economizer) must be added to external static

pressure before entering Fan Performance table.

4. Interpolation is permissible. Do not extrapolate.

5. Fan performance is based on wet coils, clean filters, and casing losses.

See Tables 21-23 for accessory/FlOP static pressure information.

6. Extensive motor and drive testing on these units ensures that the full

horsepower and watts range of the motor can be utilized with confi
dence. Using 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.

7. Use of a field-supplied motor may affect wiring size. Contact your Carrier

representative for details.

—

—

— —

— —

32

Table 16 — Fan Performance — 48TJD028 (Low Heat Units)

AIHFLOW

(cfm)

7,000 941 3.35 2769 1002 3.80 3140 1061 4.27 3528 1117 4.76 3934 1171 5.27 4356 1224 5.80 4794
7,500 999 4,05 3348 1057 4.53 3742 1112 5,02 4152 1166 5.54 4579 1218 6,07 5020 1268 6.63 5478

8,000 1058 4.85 4007 1113 5.35 4424 1165 5.87 4856 1216 6.41 5304 1266 6.97 5766 1314 7.55 6243

8,500 1117 5.74 4750 1169 6.28 5190 1219 6.83 5645 1268 7.40 6114 1315 7.98 6597 1361 8.58 7094
9,000 1177 6.75 5583 1226 7.31 6047 1274 7.89 6524 1320 8.48 7015 1365 9.09 7520 1410 9.72 8037
9,500 1237 7.98 6511 1284 8.46 6999 1329 9.07 7499 1374 9.69 8012 1417 10.33 8538 1459 10.98 9076

10,000 1297 9.12 7450 1342 9.74 8051 1385 10.37 8574 1428 11,02 9110 1469 11.68 9657 1510 12.36 10217

10,500 1358 10.49 8674 1400 11.14 9209 1442 11.80 9755 1483 12,47 10314 1523 13.16 10883

11,000 1418 12.00 9919 1459 12.67 10478

11,250 1449 12.80 10585

AIHFLOW

(cfm)

7,000 1274 6.35 5248 1323 6.92 5718 1371 5.54 6204
7,500 1316 7.20 6960 1364 7.79 6437 1410 6.41 6939

8,000 1360 8.14 6734 1406 8.76 7239 1450 7.40 7759

8,500 1406 9.20 7605 1449 9.83 8129 1492 8.48 8666
9,000 1453 10.36 8568 1495 11.02 9111 1536 9.69 9667
9,500 1501 11.64 9627 1541 12.32 10190

10,000

10,500

11,000

11,250

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

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

— — — — — — — — — — — — — — —

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.4 1.6 1.8

_ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _
—

— — —

—

— — — —

LEGEND

Bhp — Brake Horsepower
Flop — Factory-Installed Option

Watts — Input Watts to Motor

NOTES;

1. Standard low-medium static drive range Is 1066 to 1283 rpm. Alternate
high-static drive range is 1332 to 1550. Other rpms require a field­supplied drive.

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

AVAiLABLE EXTERNAL STATIC PRESSURE (in. wg)

_ _ _ _ _ _ _ _ _ _ _ _

—

— —

—

—

— —

„

— —

3. Static pressure losses (i.e., economizer) must be added to external static

pressure before entering Fan Performance table,

4. Interpolation is permissible. Do not extrapolate.

5. Fan performance is based on wet coils, clean filters, and casing losses.

See Tables 21-23 for accessory/FlOP static pressure information,

6. Extensive motor and drive testing on these units ensures that the full

horsepower and watts range of the motor can be utilized with confi
dence. Using 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.

7. Use of a field-supplied motor may affect wiring size. Contact your Carrier

representative for details.

— — —

Table 17 — Fan Performance — 48TJF016 (High Heat Units)

AIHFLOW

(cfm)

4500 819 1.55 1335 914 1.76 1518 1001 1.98 1705 1083 2.20 1894 1160 2.42 2088 1234 2.65 2284
4800 861 1.78 1538 951 2.00 1726 1035 2.22 1916 1113 2.45 2110 1188 2.68 2307 1259 2.91 2507
5100 904 2,04 1759 989 2,26 1952 1069 2,49 2147 1145 2,72 2345 1218 2.95 2545 1287 3.17 2749
5400 947 2,32 1999 1028 2,55 2197 1105 2,78 2396 1179 3,01 2598 1248 3.25 2802 1315 3.49 3009
5700 990 2,62 2259 1068 2,85 2461 1142 3,09 2665 1213 3,33 2871 1280 3.57 3079 1345 3.81 3289
6000 1034 2.94 2539 1109 3.18 2745 1180 3.42 2953 1248 3.67 3163 1313 3.91 3375 1376 4.16 3589
6300 1078 3.29 2840 1150 3.54 3050 1218 3.78 3262 1284 4.03 3476 1348 4.28 3692
6600 1123 3.67 3161 1192 3.91 3376 1258 4.16 3592
6900 1167 4.06 3504 1234 4.32 3723 — — — — — — — — — — — —
7200

AIHFLOW

(cfm)

4500 1304 2,88 2484 1371 3,12 2688 1435 3.36 2895 1467 3.48 2999 1497 3.60 3104
4800 1327 3.14 2711 1393 3.38 2917 1456 3.62 3126 1486 3.75 3232 1517 3.87 3338
5100 1353 3.43 2955 1417 3.67 3165 1478 3.92 3377 1508 4.04 3484 1537 4.16 3592
5400 1380 3.73 3219 1442 3.98 3432 1502 4.23 3646 1531 4.35 3755
5700
6000
6300
6600
6900
7200

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

0.2 0.4 0,6 0.8 1.0 1.2

— —

—

— —

—

AVAILABLE EXTERNAL STATIC PRESSURE (irt. 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

1408 4.06 3503 1468 4.31 3718

— — — — — — - — — - — -

LEGEND

Bhp — Brake Horsepower
Flop — Factory-Installed Option

Watts — Input Watts to Motor

NOTES:

1

Standard low-medium static drive range is 891 to 1179 rpm (for 208/230
and 460-v units) or 1159 to 1429 rpm (for 575-v units). Alternate high­static drive range is 1227 to 1550 (for 208/230 and 460-v units). The
alternate high-static drive is not available for 48TJ016 575-v units. Other
rpms require a field-supplied drive.
Maximum continuous bhp is 4.25 (208/230 and 460 v) or 3.45 (575 v)
and the maximum continuous watts are 3775 (208/230 and 460 v) or

AVAILABLE EXTERNAL STATIC PRESSURE (iri. wg)

— — —

—

— —

—

—

— — —

—

- — — - — — — - —

3065 (575 v). Do not adjust motor rpm such that motor maximum bhp
and/or watts is exceeded at the maximum operating cfm.

3. Static pressure losses (i.e., economizer) must be added to external static

pressure before entering Fan Performance table.

4. Interpolation is permissible. Do not extrapolate.

5. Fan performance is based on wet coils, clean filters, and casing losses.

See Tables 21-23 for accessory/FlOP static pressure information.

6. Extensive motor and drive testing on these units ensures that the full

horsepower and watts range of the motor can be utilized with confi
dence. Using tan 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.

7. Use of a field-supplied motor may affect wiring size. Contact your Carrier

representative for details.

— —

— —

—

—

_ _ _
— —

— —

—

—

33

Table 18 — Fan Performance — 48TJF020 and 024 (High Heat Units)

AiHFLOW

(cfm)

5,500 795 2,43 2043 866 2.74 2306 934 3.07 2578 998 3.40 2856 1059 3.74 3142 1117 4.08 3434

6,000 854 2,92 2452 921 3.24 2722 984 3.57 3998 1044 3,90 3281 1102 4.25 3570 1158 4.60 3865

6,500 914 3,46 2909 977 3.79 3184 1036 4.12 3465 1093 4.46 3752 1148 4.81 4045 1201 5.16 4343
7,000 975 4.06 3414 1034 4.39 3695 1090 4.73 3981 1144 5.08 4272 1196 5.43 4569 1246 5.79 4870
7,500 1037 4.72 3969 1092 5.06 4255 1145 5.41 4546 1196 5.76 4842 1256 6.12 5142 1294 6.48 5447

8,000 1099 5,44 4575 1150 5,79 4866 1201 6.14 5162 1249 6.50 5462 1297 6,86 5766 1343 7.22 6075

8,500 1161 6,22 5232 1210 6,57 5529 1258 6.93 5829 1304 7.29 6134 1349 7,66 6443 1393 8.03 6755
9,000 1223 7,07 5943 1270 7,43 6245 1315 7.79 6550 1360 8.16 6869 1403 8.53 7171 1445 8.90 7487
9,500 1286 7,98 6708 1331 8.34 7014 1374 8.71 7324 1416 9.08 7638 1457 9.46 7954 1498 9.84 8274

10,000 1349 8.95 7528 1392 9.32 7839 1433 9.70 8154 1473 10.07 8471

AIRFLOW

(cfm)

5,500 1173

6,000 1211 4.95 4165 1263 5.32 4471 1313 5.69 4782 1337 5.87 4939 1361 6,06 5097

6,500 1252 5,53 4646 1302 5.89 4954 1350 6.26 5267 1373 6.56 5425 1396 6.64 5584
7,000 1295 6.16 5176 1343 6.52 5487 1389 6.90 5802 1412 7.09 5961 1434 7.28 6121
7,500 1340 6.85 5756 1386 7.22 6070 1431 7.60 6387 1452 7.79 6547 1474 7.98 6709

8,000 1388 7.60 6388 1431 7.97 6704 1474 8.35 7024 1495 8.54 7186 1516 8.74 7348

8,500 1436 8.41 7071 1478 8.79 7390 1520 9.17 7713 1540 9.37 7876
9,000 I486 9.28 7807 1527 9.67 8130
9,500 1538 10.22 8597

10,000

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

0.2 0.4 0.6 0.8 1.0 1.2

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

4.44

3732 1227 4.80 4036 1279 5.17 4345 1304 5.35 4502 1329 5,54 4629

—

—

— — — — — — —

LEGEND

Bhp — Brake Horsepower
Flop — Factory-Installed Option

Watts — Input Watts to Motor

NOTES;

1. 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 tield-supplied drive.

2, Maximum continuous bhp tor the 020 size is 5.90. Maximum continuous

bhp for the 024 size is 8.7 (208/230, 575 v) or 9.5 (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 (460 v). Do not

AVAILABLE EXTERNAL STATIC PRESSURE (iti, wg)

_ _ _ _ _ _ _ _ _

—

— — —

— —
„

adjust motor rpm such that motor maximum bhp and/or watts is
exceeded at the maximum operating dm.

3. Static pressure losses (i.e., economizer) must be added to external static

pressure before entering Fan Performance table.

4. Interpolation is permissible. Do not extrapolate.

5. Fan performance is based on wet coils, clean filters, and casing losses.

See Tables 21-23 for accessory/FlOP static pressure information.

6. Extensive motor and drive testing on these units ensures that the full

horsepower and watts range of the motor can be utilized with confi
dence. Using 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.

7. Use of a field-supplied motor may affect wiring size. Contact your Carrier

representative for details.

—

—

— — — — — —

_ _ _

—
„

—

—

„

—

Table 19 — Fan Performance — 48TJF028 (High Heat Units)

AIRFLOW

(cfm)

7,000 992 4.05 3,348 1051 4.44 3,668 1106 4.83 3995 1160 5.24 4331 1212 5.65 4675 1262 6.08 5026
7,500 1055 4.77 3,947 1110 5.17 4,277 1162 5.58 4615 1214 6.00 4960 1263 6.43 5312 1311 6.86 5672

8,000 1118 5.58 4,610 1170 5.99 4,950 1220 6.41 5298 1268 6.84 5653 1315 7.27 6014 1361 7.72 6382

8,500 1182 6,46 5,339 1231 6.88 5,690 1278 7.31 6047 1324 7.75 6411 1369 8,20 6782 1413 8.66 7158
9,000 1246 7,42 6,136 1292 7.86 6,498 1337 8.30 6865 1381 8.75 7239 1424 9,21 7618 1466 9.68 8003
9,500 1310 8,47 7,005 1354 8.92 7,377 1397 9.38 7754 1439 9.84 8137 1480 10,31 8525 1520 10.79 8918

10,000 1374 9.61 7,947 1416 10.07 8,329 1457 10.54 8715 1497 11.02 9107 1537 11.50 9504

10,500 1439 10.84 8,964 1479 11.32 9,356 1518 11.79 9752

11,000 1503 12.17 10,059 1542 12.65 10,460

11,250 1536 12.86 10,636

AIRFLOW

(cfm)

7,000 1311 6.51 5385 1359 6.96 5751 1405 6.00 6124
7,500 1358 7.30 6039 1403 7.76 6412 1448 6.84 6792

8,000 1406 8.17 6767 1560 8.63 7137 1492 7.75 7524

8,500 1456 9.12 7541 1498 9.59 7929 1539 8.75 8323
9,000 1507 10.15 8393 1548 10.63 8790 — — —
9,500

10,000

10,500

11,000

11,250

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

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

0.2 0.4 0.6 0.8 1.0 1.2

— — — — — — — — — — — — — — —

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.4 1.6 1.8

—

—
—

— — — — — — — — —

— — —

—

— — —

— —

LEGEND

Bhp — Brake Horsepower
Flop — Factory-Installed Option

Watts — Input Watts to Motor

NOTES:

1, Standard low-medium static drive range is 1066 to 1283 rpm. Alternate

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

supplied drive.

2. Maximum continuous bhp is 10.2 (208/230, 575 v) or 11.8 (460 v) and

the maximum continuous watts are 9510 (208/230, 575 v) or 11,000

(460 v). Do not adjust motor rpm such that motor maximum bhp and/or

watts is exceeded at the maximum operating cfm.

AVAfLABLE EXTERNAL STATIC PRESSURE (in. wg)

— —

— — —

3. Static pressure losses (i.e,, economizer) must be added to external static

pressure before entering Fan Performance table.

4. Interpolation is permissible. Do not extrapolate.

5. Fan performance is based on wet coils, clean filters, and casing losses.

See Tables 21-23 for accessory/FlOP static pressure information.

6. Extensive motor and drive testing on these units ensures that the full

horsepower and watts range of the motor can be utilized with confi
dence, Using 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.

7. Use of a field-supplied motor may affect wiring size. Contact your Carrier

representative for details.

—
—

— —

— — —
— — —

— —
— —

—
—

— —
— — —
— — —

—

—
—

34

Table 20 — Air Quantity Limits

UNIT
48TJ

016 4500 3800 3800 7,500

MINIMUM

COOLING

CFM

Low Heat High Heat

020 5400 4750 5450 9,000

024 6000 4750 5450 10,000

028 7000 4750 5450 11,250

Table 21 — Accessory/FlOP Static Pressure*

(In. wg) —48TJ016

MINIMUM

HEATING CFM

MAXIMUM

CFM

COMPONENT

Economizer 0.04 0.05 0.07 0.09 0.10

4500 5000 6000 7200 7500

CFM

LEGEND
Flop — Factory-Installed Option
*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 Per
formance tables to determine biower rpm and watts.

Table 22 — Accessory/FlOP Static Pressure*

(In. wg) — 48TJ020-028

COMPONENT

Economizer 0.06 0.07 0.09 0.11 0.12 0.14

5000 6000 7200 9000 10,000 11,250

LEGEND

Flop — Factory-Installed Option

*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 Perfor
mance tables to determine blower rpm and watts.

CFM

Table 23 — MolstureMISer’'“ Dehumldlflcatlon

Package Static Pressure Drop (In. wg)

UNIT SIZE

48TJ016 15 .040 .071 .111
48TJ020 18 .058 .102 .160
48TJ024 20 .071 .126 .197
48TJ028 25 .111 .197 .308

UNIT NOMINAL

TONS

300 400 500

CFM PER TON

Table 24 — Fan Rpm at Motor Pulley Settings*

48TJ

016(208/230, 460 v)t

016 (208/230, 460 V)“

016(575 v)t

020t

020**

024t

024**

028t

028**

‘Approximate fan rpm shown,

flndicates standard drive package.

“Indicates alternate drive package.

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

1/2

0

tt tt
tt tt
tt tt
tt tt
tt tt
tt tt
tt tt
tt tt
tt tt tt tt

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

turns open.

li/j

1

2i/j

2

1551 1524 1497 1470 1443 1415 1388 1361 1332

3

NOTE: For
required.

3i'a

speeds not listed above, field-supplied drives are

41/j

4

5

5i'a

35

6

Table 25 — Evaporator-Fan Motor Data

UNIT

48TJ

016

020

024

028

LEGEND

ВНР — Brake Horsepower
BkW — Brake Kilowatts

‘Extensive motor and eleclricai testing on these units ensures that the fuii horsepower (brake kiiowatt)

range of the motors can be utilized with confidence. Using your fan motors up to the horsepower (brake
kilowatt) ratings shown in this table will not result in nuisance tripping or premature motor failure. Unit
warranty will not be affected.

NOTE: All indoor-fan motors 5 hp and larger meet the minimum efficiency requirements as established by
the Energy Policy Act of 1992 (EPACT) effective October 24, 1997.

UNIT

VOLTAGE

208/230 4.25 3.17 3,775 10.5

460 4.25 3.17 3,775 4.8
575 3.45 2.59 3,065 3,9

208/230

460 7.9
575 6,0

208/230 8.70 6.49 7,915 22.0

460 9.50 7.08 8,640 13.0
575 8.70 6.49 7,915 10.0

208/230 10.20 7.61 9,510 28.0

460 11.80 8.80 11,000 14.6
575 10.20 7.61 9,510 13.0

MAXIMUM

ACCEPTABLE

CONTINUOUS ВНР*

5.90 4.40 5,180

Table 26 — Evaporator-Fan Motor Efficiency

UNIT 48TJ MOTOR EFFICIENCY (%)

016 (3.0 Hp) 81.7

016(3.7 Hp) 85,8

020 (5 Hp) 87.5

024 (7.5 Hp) 88.5

028 (10 Hp) 89,5

NOTE: All indoor-fan motors 5 hp and larger meet the minimum effi
ciency requirements as established by the Energy Policy Act of 1992
(EPACT) effective October 24, 1997.

CONDENSER-FANS AND MOTORS Condenser fans
and motor's are factoi-y set. Refer to Condenser-Fan Adjustment
section (page 42) as requii'ed. Be sure that tans I'otate in the
pixrper direction.

RETURN-AIR FILTERS — Check that coi'rect filter's ar'e
installed in filter tracks (see Table I). Do not oper'ate unit with
out retur n-air filter s.

OUTDOOR-AIR INLET SCREENS — Outdoor-air inlet
scr'eens must be in place befor'e oper'ating unit.

GAS HEAT — Ver'ify gas pr'essures befor'e tur'ning on heat as
follows:

1. Turn off r"nanual gas stop.

2. Connect pr'essur'e gage to supply gas pressure tap (see
Fig. 1.3).

3. Connect pressur'e gage to r'nanifold pr'essur'e tap on gas
valve.

4. Turn on ruanual gas stop and set theranostat to HEAT
position. Adjust set point to several degr'ees above the
curr'ent r'oom teruper'atun; to ensur'e a heat demand. After
the unit has tarn for several minutes, verify that incoming
pressure is 5.5 in. wg or gr'eater', and that the manifold
pressure is 3.3 in. wg. If manifold pr'essure must be ad

justed, refer to Gas Valve Adjustment section on page 43.

.3. After unit has been in oper ation for 5 minutes, check tem

perature rise acr'oss the heat exchangers. See unit infor'­rnative plate for corr'ect rise limits of the heat supplied.
Air quantities may need to be adjusted to bring the actual

MAXIMUM

ACCEPTABLE

CONTINUOUS BkW*

Operating Sequence

COOLING, UNITS WITHOUT ECONOMIZER — Wlien
ther'rnostat calls for cooling, ter'rnimils G and Y1 ar'e ener'gized.
The indoor (evaporator') fan contactor (IFC), cornpr'essor con
tactor no. 1 (Cl) and outdoor'-fan contactor (OFC) an: ener'
gized, and evapor'ator-fan motor', cornpnsssor' no. 1, and both
condenser' fans star!. Tlie condenser'-fan motor's rirn continuous
ly while unit is cooling. If the thermostat calls for a second stage
of cooling by ener'gizing Y2, cornpr'essor contactor no. 2 (C2) is
energized and compressor no. 2 starts.

When the thermostat is satisfied, Cl and C2 ше deener
gized and tlie cornpr'essors and outdoor (condenser) fan motors
(OFM) shut off. After a 30-second delay, the indoor (evapora
tor') fan motor (IFM) shuts off If the ther'rnostat fan selector
switch is in the ON position, tlie evapor'ator-fan motor will ran
continuously.

HEATING. UNITS WITHOUT ECONOMIZER ^ When
the thermostat calls for heating, ter'rninal W1 is ener'gized. In
or'der to pr'event ther'rnostat shorf-cycling, the unit is locked
into the Heating mode for at least 1 minute when W1 is ener'
gized. The induced-dr'aft motor (IDM) is then ener'gized and
the bur'ner ignition sequence begins. The indoor (evapor'ator')
fan motor (IFM) is ener'gized 4.5 seconds after a flame is
ignited. On units equipped for two stages of heat, when addi
tional heat is needed, W2 is energized and the high-fu'e sole
noid on the main gas valve (MGV) is ener'gized. When the
ther'rnostat is satisfied and W1 and W2 ar'e deener'gized, the
IFM stops after a 4.5-second tirne-off delay.

COOLING. UNITS WITH ECONOMI$ERIV ^ When tree
cooling is not available, tlie compressor's will be controlled by
the zone thermostat. When tree cooling is available, the
outdoor-itir damper is modulated by the EconoMi$er'IV contr'ol
to pr'ovide a .50 to 55 F supply-air temperature into the zone. As
the supply-air ternper'ature fluctuates above 55 or below 50 F,
the damper's will be modulated (open or close) to br'ing the
supply-air ternperatun: back within the set point limits.

For EconoMi$er'IV oper'ation, there must be a ther'rnostat
call for the fan (G). This will move Ше damper to its minimum
position during the occupied mode.

ACCEPTABLE

OPERATING WATTS

rise to within the allowable limits.

MAXIMUM

MAXIMUM

AMP DRAW

15.8

.36

Above 50 F supply-air temperature, the dampers will modu
late from 100% open to the minimum open position. From 50 F
to 45 F supply-air temperature, the dtunpers will maintain
at the minimum open position. Below 45 F the diimpers will
be completely shut. As the supply-air temperature rises, the
dampers will come back open to the minimum open position
once the supply-air temperature rises to 48 F.

If optional powei' exhaust is installed, as the outdoor-air
damper opens and closes, the power exhaust fan will be ener
gized and deenergized.

If field-installed accessoiy CO2 sensors are connected to the
EconoMi$erIV control, a demand controlled ventilation strate
gy will begin to operate. As the CO2 level in the zone increases
above tlie CO2 set point, the minimum position of tlie damper
will be increased proportionally. As the CO2 level decreases
because of the increase in fresh air, tlie outdoor-air damper will
be proportionally closed. Damper position will follow the high
er demand condition from DCV mode or free cooling mode.

Damper movement from full closed to full open (or vice
verea) will tiike between 1V2 and 2V2 minutes.

If free cooling can be used as determined from the appropri
ate changeover command (switch, diy bulb, enthalpy curve,
differential diy bulb, or differential entlialpy), a call for cooling
(Yl closes at the thermostat) will cause the control to modulate
the clamper open to miiintain the supply air temperature set
point at 50 to 55 F.

As tlie supply-air temperature di'ops below the set point
range of 50 to 55 F, the control will modulate the outdoor-air
dampers closed to maintain the proper supply-air tempeiature.

HEATING, UNITS WITH ECONOMI$ERIV -- When the
room thermostat calls for heat, the heating controls are ener
gized as described in the Heating, Units Without Economizer
section. When the indoor fan is energized, the economizer
damper moves to the minimum position. Wlien the indoor fan
is off, the economizer diunper is fully closed.

COOLING. UNITS WITH ECONOMI$ER2. PREMIER­LINRi^' CONTROL AND A THERMOSTAT — When free
cooling is not available, the compressoi's will be controlled by
the PremierLink control in response to the Yl and Y2 inputs
from the thermostat.

Tlie PremierLink control will use the following information

to determine if free cooling is available:

• Indoor fan has been on for at least .30 seconds.

• The SPT, SAT, and OAT inputs must have valid readings.

• OAT must be less than 75 F,

• OAT must be less than SPT,

• Enthalpy must be LOW (may be jumpered if an enthalpy

sensor not available).

• Economizer position is NOT forced.

Pre-cooling occurs when the is no call from the themiostat
except G. Pre-cooling is defined as the economizer modulates
to provide 70 F supply air.

When free cooling is available the PremierLink control will
control the compressors and economizer to provide a supply­air temperature determined to meet the Yl and Y2 ctills from
the thermostat using the following tliree routines. Пае three
control routines are based on OAT

Tlie 3 routines ш'е based on OAT where:
SASP = Supply Air Set Point
DXCTLO = Direct Expansion Cooling Lockout Set Point
PID = Proportional Integral

Routine 1 (OAT < DXCTLO)

• Yl energized - economizer maintains a SASP =

(SATLOl -I- 3),

• Y2 energized - economizer maintains a SASP =

(SATL02 -I- 3).

Routine 2 (DXCTLO < OAT < 68 F)

If only Yl eneraized. the economizer maintains a SASP
= (SATLOl -1-3).
If SAT > SASP -I- 5 and economizer position > 80%,
economizer will go to minimum position for 3 minutes or
until SAT > 68 F.
First stage of mechanical cooling will be energized.
Integrator resets.
Economizer opens again and controls to current SASP
after stage one on for 90 seconds.
With Yl and Y2 energized economizer maintains an
SASP = SATL02 -I- .3.
If SAT > SASP -I- 5 and economizer position >80%,
economizer will go to minimum position for 3 minutes or
until SAT > 68 F.
If compressor one is on then second stage of mechanical
cooling will be energized. Otherwise the first stage will
be energized.
Integrator resets.
Economizer opens again and controls to SASP after
stage one on for 90 seconds.

Routine 3 (OAT > 68)

Economizer is opened 100%.
Compressors 1 and 2 are cycled based on Yl and Y2
using minimum on and off times and watching the sup
ply air temperature as compared to SATLOl and
SATL02 set points.

If optional power exhaust is installed, as the outdoor-air
damper opens and closes, the power exhaust fans will be ener
gized and deenergized.

If field-installed accessoiy CO2 sensors tti'e connected to the
PremierLink control, a PID-controlled demand ventilation

strategy will begin to operate. As the CO2 level in the zone

increases above the CO2 set point, the minimum position of the
damper will be increased proportionally. As the CO2 level
decreases because of the increase in fresh air, the outdoor-air
damper will be proportionally closed.

HEATING UNITS WITH ECONOMI$ER2. PREMIERLINK
CONTROL AND A THERMOSTAT—-When the tliermostat
calls for heating, terminal W1 is energized. Tlie PremierLink
control will move the economizer damper to the minimum

position if there is a call for G and closed if tliere is a call for
W1 without G In order to prevent thermostat from short cy
cling, the unit is locked into the heating mode for at least

10 minutes when W1 is energized. The induced-di'aft motor is

tlien energized and the burner ignition sequence begins.

On units equipped for two stages of heat, when additional
heat is needed, W2 is energized and tlie high-fire solenoid on
tlie main gas valve (MGV) is energized. When the thermostat

is satisfied and W1 is deenergized, the IFM stops after a

45-second time-off delay unless G is still maintained.
COOLING UNITS WITH ECONOMI$ER2. PREMIER

LINK CONTROL AND A ROOM SENSOR — When free
cooling is not available, the compressors will be controlled by
the PremierLink controller using a PID Error reduction calcula
tion as indicated by Fig. 46.

The PremierLink controller will use the following informa
tion to detennine if free cooling is available:

• Indoor fan has been on for at least 30 seconds.

• The SPT, SAT, and OAT inputs must have valid readings.

• OAT must be less than 75 E

• OAT must be less than SPT.

• Enthalpy must be LOW (may be jumpered if and
enthalpy sensor is not available).

• Economizer position is NOT forced.
When free cooling is available, the outdoor-air damper is

positioned through the use of a Proportional Integral (PID)

control process to provide a calculated supply-air temperature

.37

into the zone. The supply air will maintiiin the space tempera
ture between the heating and cooling set points as indicated in
Fig. 47.

Tlie PremierLink''''* will integrate the compressors stages
with the economizer based on similar logic as the three routines
listed in the previous section. Tlie SASP will float up and down
based on the eiror reduction calculations that compare space
temperatuie and space set point.

When outdoor-air temperature conditions require the econo
mizer to close for a compressor stage-up sequence, the econo
mizer control integrator is reset to zero after the stage-up se
quence is completed. This prevents the supply-tiir temperature
from di'opping too quickly and creating a freeze condition that
would make tlie compressor turn off prematurely.

Tlie high space set point is used for DX (direct expansion)
cooling control, while the economizer space set point is a
ciiiculated value between the heating and cooling set points.
Tlie economizer set point will always be at least one degree
below the cooling set point, allowing for a smooth transition
from mechanical cooling with economizer assist, back to
economizer cooling as the cooling set point is achieved.
Tlie compressors may be used for initial cooling then the
PremierLink controller will modulate tlie economizer using an
error reduction calculation to hold the space temperature
between the heating and cooling set points. See Fig. 47.

Tlie controller uses the following conditions to determine
economizer cooling:

Enthalpy is Low

SAT reading is available

OAT reading is available

SPT reading is available

OAT < SPT

Economizer Position is NOT forced

If any of the above conditions are not met, the economizer
submaster reference (ECSR) is set to maximum limit and the
diunper moves to minimum position. The operating sequence
is complete. The ECSR is recalculated eveiy 30 seconds.

If an optional power exhaust is installed, as the outdoor-air
diunper opens and closes, tlie power exhaust fans will be
energized and deenergized.

if field-installed accessoiy CO2 sensors are connected to
the PremierLink control, a PID-controlled demand ventilation
strategy will begin to operate. As the CO2 level in the zone
increases above the CO2 set point, the minimum position of the
damper will be increased proportionally. As the CO2 level
decreases because of the increase in fresh air, the outdoor-air
damper will be proportionally closed.

HEATING, UNIT WITH ECONOMI$ER2. PREMIERLINK
CONTROL AND A ROOM SENSOR ^ Eveiy 40 seconds
the controller will calculate the required heat stages (maximum
of 3) to maintain supply air temperature (SAT) if the following
qualifying conditions are met:

• Indoor fan has been on for at least 30 seconds.

• COOL mode is not active.

• OCCUPIED, TEMP.COMPENSATED START or HEAT

mode is active.

• SAT reading is available.

• Fire shutdown mode is not active.

If all of the above conditions lu'e met, tlie number of heat
stages is calculated; otheiwise the required number of heat
stages will be set to 0.

If tlie PremierLink controller detennines that heat stages are
required, the economizer damper will be moved to minimum
position if occupied and closed if unoccupied.

Staging should be as follows:

If Heating PID STAGES=2

• HEAT STAGES=I (75% capacity) will energize HS1

• HEAT STAGES=2 (100% capacity) will energize HS2

In order to prevent short cycling, the unit is locked into the
Heating mode for at least 10 minutes when HS I is deenergized.
When HSl is energized tlie induced-draft motor is then
energized and tlie burner ignition sequence begins. On units
equipped for two stages of heat, when additional heat is need
ed, HS2 is energized and the high-fire solenoid on the main gas
valve (MGV) is energized. When tlie space condition is satis
fied and HSl is deenergized the IFM stops after a 45-second
time-off delay unless in the occupied mode. The fan will mn
continuously in the occupied mode as required by nationtil
energy and fresh air standards.

NOTE: PremierLink control performs smart staging of 2 stages of DX
cooling and up to 3 stages of heat.

Fig. 46 — DX Cooling Temperature

Control Example

38

SERVICE

^ WARNING

Before performing service or maintenance operations on
unit, turn off main power switch to unit and install lockout
tag on disconnect switch. Electrical shock could cause per
sonell injuiy.

Cleaning — inspect unit interior at beginning of each
heating and cooling season and as operating conditions require
(see Fig. 48). Remove unit top panel and/or side panels for ac
cess to unit interior.

COIL MAINTENANCE AND CEEANING RECOMMEN
DATION — Routine cleaning of coil surfaces is essential to
maintiiin proper operation of the unit. Elimination of contami
nation and removal of harmful residues will greatly increase
the life of the coil and extend the life of tlie unit. The following
maintenance and cleaning procedures are recommended as part
of the routine maintenance activities to extend the life of the
coil.

INDUCED DRAFT INTEGRATED GAS VIEW CONTROL BOX
MOTOR UNIT CONTROLLER PORT ACCESS PANEL

aluminum, pre-coated, copper/copper or E-coated coils be
cleaned with the Totaline environmentally sound coil cleaner
as described below. Coil cleaning should be part of the unit’s
reguUirly scheduled maintenance procedures to ensure long life
of the coil. Failure to clean the coils may result in reduced du
rability in the environment.

Avoid the use of:

• Coil brighteners

• Acid cleaning prior to painting

• High pressure washers

• Poor quality water for cleaning
Totaline environmentally sound coil cleaner is non-flamma

ble, hypoallergenic, nonbacterial, and a USDA accepted biode
gradable agent that will not harm the coil or surrounding com

ponents such as electrical wiring, piiinted metal surfaces, or in
sulation. Use of non-recommended coil cleaners is strongly

discouraged since coil and unit durability could be affected.

Totaline Environmentally Sound Coil Cleaner Application

Equipment

• 2V2 gallon garden sprayer

• Water rinse with low velocity spray nozzle

A CAUTION

Harsh chemicals, household bleach or acid or basic clean
ers should not be used to clean outdoor or indoor coils of
any kind. These cleaners can be veiy difficult to rinse out
of the coil and can accelerate corrosion at the fm/tube inter
face where dissimilar materials are in contact. If there is
dirt below the surface of tlie coil, use the Totaline environ
mentally sound coil cleaner as described above.

Fig. 48 — Typical Gas Heating Section

Remove Surface Loaded Fibers — Surface loaded fibers or
dirt should be removed with a vacuum cleaner. If a vacuum
cleaner is not available, a soft non-metallic bristle bmsh may
be used. In either case, the tool should be applied in the direc
tion of the fins. Coil surfaces can be easily damaged (fin edges
can be easily bent over and damage to the coating of a protect
ed coil) if the tool is applied across the fins.

NOTE; Use of a water stream, such as a garden hose, against a
surface loaded coil will drive tlie fibers and dirt into the coil.
This will make cleaning efforts more difficult. Suiface loaded
fibeisi must be completely removed prior to using low velocity
clean water rinse.

Periodic Clean Water Rinse — A periodic clean water rinse is
veiy beneficial for coils that are applied in coastal or industrial
environments. However, it is veiy important that the water
rinse is made with veiy low velocity water stream to avoid
damaging tlie fin edges. Monthly cleaning as described below
is recommended.

Routine Cleaning of Coil Surfaces — Montlily cleaning with
Totaline® environmentally sound coil cleaner is essential to
extend the life of coils. This cleaner is available from Canier
Replacement parts division as part number P902-0.'301 for a
one gallon container, and part number P902-0.805 for a 5 gallon
container. It is recommended that all coils, including standard

A CAUTION

High velocity water from a pressure washer, garden hose,
or compressed air should never be used to clean a coil. The
force of the water or air jet will bend the fin edges and
increase airside pressure drop. Reduced unit performance
or nuisance unit shutdown may occur.

Totaline Environmentally Sound Coil Cleaner Application

instructions

1. Proper eye protection such as safety glasses is recom
mended during mixing and application.

2. Remove all surface loaded fibers and dirt with a vacuum
cleaner as described above.

.4. Tlioroughly wet finned surfaces with clean water and a

low velocity garden hose, being careful not to bend fins.

4. Mix Totaline environmentally sound coil cleaner in a

2V2 gallon gai'den sprayer according to the instmctions

included with the cleaner. The optimum solution temper
ature is lOOF.

NOTE: Do NOT USE water in excess of 1.30 F, as the enzy
matic activity will be destroyed.

5. Tlioroughly apply Totaline environmentally sound coil
cleaner solution to all coil surfaces including finned area,
tube sheets and coil headers.

6. Hold garden sprayer nozzle close to finned areas and ap
ply cleaner with a vertical, up-and-down motion. Avoid
spraying in horizontal pattern to minimize potential for
tin damage.

7. Ensure cleaner thoroughly penetrates deep into finned
ai'eas.

8. Interior and exterior finned tu'eas must be thoi'oughly
cleaned.

9. Finned surfaces should remain wet with cleaning solution
for 10 minutes.

39

10. Ensure surfaces are not allowed to diy before rinsing.
Reapplying cleaner as needed to ensure 10-minute satura
tion is achieved.

11. Thoroughly rinse till surfaces witli low velocity clean
water using downward rinsing motion of water spray
nozzle. Protect fins from ckimage from the spray nozzle.

CONDENSATE DRAIN — Check and clean each year at
stiut of cooling season. In winter, keep drains and traps dry.

During periods of low outdoor temperatures, add anti-freeze
solution to the drain to prevent freeze up. Follow dl precau
tions on anti-freeze labeling.

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.

OUTDOOR-AIR INLET SCREENS Clean screens with
steam or hot water and a mild detergent. Do not use throwaway
filtei's in place of screens. See Table 1 for quantity and size.

MAIN BURNER — At the beginning of each heating season,
inspect for deterioration or blockage due to corrosion or other
causes. Observe the main burner flames. Refer to Mtiin Burn­era section on 43.

FLUE GAS PASSAGEWAYS — The flue collector box and
heat exchanger cells may be inspected by removing heat ex
changer access panel (see Fig. 4 and 5), flue box cover, and
main burner assembly. Refer to Main Burners section on
page 43 for burner removal sequence. If cleaning is required,
remove heat exchanger baffles and clean tubes witli a wire
bnish.

Use caution with ceramic heat exchanger baffles. When in­sLJling retaining clip, be sure the center leg of the clip extends
inward toward baffle. See Fig. 49.

HEAT EXCHANGER
TUBES

NOTE: One baffle and clip will be in each upper tube of the heat

exchanger.

Fig. 49 — Removing Heat Exchanger Ceramic

Baffles and Clips

COMBUSTION-AIR BLOWER — Clean periodically to as
sure proper airflow and heating efficiency. Inspect blower
wheel every fall and periodically during heating season. For the
first heating season, inspect blower wheel bi-monthly to deter
mine proper cleaning frequency.

To inspect blower wheel, remove heat exchanger access
panel. Shine a flashlight into opening to inspect wheel. If clean
ing is required, remove motor and wheel assembly by remov
ing screws holding motor mounting plate to top of combustion
fan housing. The motor and wheel assembly will slide up and
out of the fan housing. Remove the blower wheel from the mo
tor shaft and clean with a detergent or solvent. Replace motor
and wheel assembly.

Lubrication

COMPRESSORS — Each compressor is chttrged with the
correct amount of oil at the factoiy. Conventional white oil
(Sontext 200LT) is used. White oil is compatible witli 3GS oil,
and 3GS oil may be used if the addition of oil is required. See
compressor nameplate for originiil oil charge. A complete re­chiuge should be four ounces less than the origintil 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
the inlet of the compressor. Tlie compressor should then be nm
for 10 minutes, shut down, and the access valve opened until
no oil flows. Tills should be repeated twice to make sure the
proper oil level has been achieved.

FAN SHAFT BEARINGS — For size 016 units, bearings are
peniianently lubricated. No field lubrication is required. For
size 020-028 units, lubricate bearings at least eveiy 6 months
with suitable bearing grease. Extended grease line is provided
for far side fan bearing (opposite drive side). Typical lubricants
are given below:

MANUFACTURER LUBRICANT

Texaco Regal AFB-2*

Mobil Mobilplex EP No. 1

Sunoco Prestige 42

Texaco Multifak2

'Preferred lubricant because it contains rust and oxidation inhibitors.

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

Evaporator Fan Performance Adjustment
(Fig. 50-52) — Fan motor pulleys ai'e factoiy 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 carriage
nuts holding motor mount assembly to fan sci'oll
side plates (A and B).

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). Using bolt and plate,
raise motor to top of slide and I'einove belt. Secure
motor in this position by tightening the nuts on the
carriage bolts.

3. Loosen movable-pulley flange setscrew (see Fig. 50).

4. Scnew movable flange towai'd 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 20 for air quantity limits.

5. Set movable flange at neai'est keyway of pulley hub and
tighten setscrew. (See Table 1 for speed change for each

full tur n of pulley flange.)

6. Replace and tighten belts. See Belt Tension Adjustment

section on page 42.

To align fan and motor pulleys;

1. Loosen fan pulley setsci'ews.

2. Slide fan pulley triong fan shaft.

3. Make angular alignment by loosening motor from
mounting plate.

40

Evaporator Fan Service and Replacement

48TJ016 UNITS (See Fig. 51)
NOTE; To remove belts only, follow Steps 1-6.

1. Remove filter and supply-air section panels.
Remove unit top panel.

2.

Loosen carriage nuts A tmd B holding motor mount

3.
assembly to fan scroll side plates.

Loosen screw C.

4.
Rotate motor mount assembly (with motor attached) as

5.
far as possible away from evaporator coil.
Remove belt.

6.

7. Rotate motor mount assembly back past original position
toward evaporator coil.
Remove motor mounting nuts D and E (both sides).

8.

Lift motor up through top of unit.

9.
Reverse above procedure to reinstall motor.

10.

Check and adjust belt tension as necessaiy.

11.

48TJ020-028 UNITS (See Fig. 52) -- Tlie 48TJ020-028 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 heat
ing control access panel.
Remove the center post (located between the evaporator
fan and heating control access panels) and all screws
securing it.

3.

Loosen nuts on the 2 carriage bolts in the motor mounting
base.

4.

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

5.

Remove the belt drive.

6.

Remove jacking bolt and tapped jacking bolt plate.
Remove the 2 screws that secure the motor mounting

7.
plate to the motor support channel.

8.

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

SECOND BELT
ON 10 HP MOTOR

NOTE: A 3V2-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 %-16 x

U/4 in. LG.

Fig. 52 — 48TJ020-028 Evaporator-Fan

Motor Section

Fig. 50 — Evaporator-Fan Pulley and Adjustment

41

9. Slide out the motor and motor mounting plate.

10. Disconnect wiring connections and remove the 4 mount
ing bolts.

11. Remove tlie motor.

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

Belt Tension Adjustment — To adjust belt tension:

1. Loosen fan motor bolts.

2. a Size 016 Units:
Move motor mounting plate up or down for proper
belt tension ('/2 in. deflection with one finger),

b. Size 020-028 Units:

Turn motor jacking bolt to move motor mounting

plate up or down for proper belt tension (^/g 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

48TJ016,020 UNITS (Fig. 5.3)

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.

48TJ024,028 UNITS (Fig. 54)

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 mbber hubcap to prevent

hub from rusting to motor shaft,

5. Fill hub recess witli permagum if mbber hubcap is

missing.

Powor Failuro — 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 economiz,er

motor.

Refrigerant Charge — Amount of refrigerant chiu-ge is

listed on unit nameplate and in Table 1. Refer to Carrier

GTAC II; Module 5; Charging, Recoveiy, Recycling, and
Reclamation section for chiu'ging methods and procedures.
Unit panels must be in place when unit is operating during
chiU'ging procedure.

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

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. 55), add or remove refrigerant until conditions of the
chaif are met. Note that chtu'ging chtuf is different from those
nonnally used. An accurate pressure gage and temperature
sensing device is required. Charging is accomplished by ensur
ing the proper amount of liquid sub-cooling. Measure liquid
line pressure at the liquid line service valve using pressure
gage. Connect temperature sensing device to the liquid line
neitr the liquid line service valve and insulate it so tliat 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
chiu't is below line, carefully recover some of the charge.
Recheck suction pressure as charge is adjusted.

NOTE: Indoor-air cfm must be within normal operating range
of unit. All outdoor fans must be operating.

Tlie 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,

MOISTUREMISERTM SYSTEM CHARGING —- The sys
tem charge for units with the MoistureMi$er option is greater
than that of the standard unit iilone. Tlie chtuge for units with
this option is indicated on the unit nameplate drawing. To
chaige systems using the MoistureMi$er dehumidification
package, fully evacuate, recover, and re-chtuge the system to
the nameplate specified charge level. To check or adjust
refrigerant charge on systems using the MoistureMi$er dehu
midification package, chaige per the standard subcooling
chiu'ts. The subcooler MUST be deenergized to use the charg
ing chiufs. The charts reference a liquid pressure (psig) and
temperature at a point between the condenser coil and the sub
cooler coil. A tap is provided on the unit to measure liquid
pressure entering the subcooler (leaving tlie condenser).

ALL OUTDOOR FANS MUST BE OPERATING

BOTH CIRCUITS

NOTE: Dimensions are in inches.

Fig. 53 — Condenser Fan Adjustment, 48TJ016,020

Fig. 54 — Condenser-Fan Adjustment, 48TJ024,028

Fig. 55 — Cooling Charging Chart

42

Gas Valve Adjustment

NATURAL GAS — The gas valve opens and closes in re
sponse to the thermostat or limit control.

When power is supplied to valve terminals D1 and C2, the

main viilve opens to its preset position.

The regular factoiy setting is stamped on the v;ilve body

(3.3 in. wg).
To adjust regulator:

1. Set thermostat at setting for no call for heat.

2. Turn main gas valve to OFF position.

3. Remove Vs-in. pipe plug from manifold or gas valve
pressure tap connection. Install a suitable pressure
measuring device.

4. Set main gas valve to ON position.

5. Set thennostat at setting to call for heat.

6. Remove screw cap covering regulator adjustment screw
(see Fig. 56).

7. Turn adjustment screw clockwise to increase pressure or
counterclockwise to decrease pressure.

8. Once desired pressure is established, set thermostat set
ting for no call for heat, turn off main gas valve, remove
pressure-measuring device, and replace Vs-in. pipe plug
and screw cap.

Protective Devices

COMPRESSOR PROTECTION
Phase Protection — On 48TJ016 and 020 units, the phase

monitor relay (PMR) will monitor the sequence of the 3-phase
electrical system to provide phase reversal protection. The
PMR will also monitor tlie 3-phase voltage inputs to provide

phase loss protection for tlie 3-phase device.

Overcurrent — Each compressor has internal line break motor

protection, except the circuit no. 1 on the 48TJ028 units. Com
pressor no. 1 on the 48TJ028 unit uses an electronic module,
located witli the compressor junction box, to provide motor

protection. Tliis electronic module monitors winding and dis­chaige temperatures. If tliese temperatures reach tlie trip val
ues, the module interiupts the control line and causes the
compressor to switch off.

Crankcase Heater — Only the 48TJ028 unit and units with
optional MoistureMiSeff^* 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.

IMPORTANT: After a prolonged shutdown or servicing,
energize the crankcase heaters for 24 horn's before stint
ing the compressors.

REGULATOR

ADJUSTMENT

SCREW
(REMOVE
COVER)

Fig. 56 — Gas Valve

Main Burners — For all applications, main burners are

factoiy set and should require no adjustment.
MAIN BURNER REMOVAL

1. Shut off (field-supplied) manual main gas valve.

2. Shut off power to unit.

3. Remove unit control box access panel, burner section ac
cess panel, and center post (see Fig. 4 and 5).

4. Disconnect gas piping from gas valve inlet.

5. Remove wires from gas valve.

6. Remove wires from rollout switch.

7. Remove sensor wire and ignitor cable from IGC board.

8. Remove 2 screws securing manifold bracket to basepan.

9. Remove 2 screws that hold the burner support plate
flange to the vestibule plate.

10. Lift burner assembly out of unit.

CLEANING AND ADJUSTMENT

1. Remove burner rack from unit as described in Main
Burner Removal section above.

2. Inspect burners, and if dirty, remove burners from rack.

3. Using a soft bnjsh, clean burners and crossover port as
required.

4. Adjust spark gap. See Fig. 57.

5. Reinstall burners on rack.

6. Reinstiill burner rack as described above.

Filter Drier — Replace whenever refrigerant system is

exposed to atmosphere.

Compressor Lockout — If any of the safeties (high-pressure,

low-pressure, freeze protection thermostat, compressor internal
tliermostat) trip, or if tliere is loss of power to tlie compressors,
tlie cooling lockout (CLO) will lock the compressors off. To
reset, manually move the thermostat setting.

EVAPORATOR-PAN MOTOR PROTECTION — A man
ual reset, ciilibrated 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-PRESSURE AND LOW-PRESSURE SWITCHES ^
If either switch trips, or if the compressor overtemperature

switch activates, that refrigerant circuit will be automatically

locked out by the CLO. To reset, manually move the thermo

stat setting.
FREEZE PROTECTION THERMOSTAT (PPT) — An PPT

is located on the top and bottom of the evaporator coil. They
detect frost build-up and turn off the compressor, allowing the
coil to clear. Once the frost has melted, the compressor can be
reenergized by resetting the compressor lockout.

Relief Devices — All units have relief devices to protect
against damage from excessive pressures (i.e., fire). Tliese
devices protect the high and low side.

Control Circuit, 24-V — This control circuit is pro
tected against overcurrent by a 3.2 amp circuit breaker.
Breaker can be reset. If it trips, determine cause of trouble
before resetting. See Fig. 58 and 59 for typical wiring diagram
and component ai'rangement.

Replacement Parts — a complete list of replacement

parts may be obtained from any Carrier distributor upon
request.

Diagnostic IGC Control LEDs — Tlie IGC bomd
has LEDs for diagnostic purposes. Refer to Troubleshooting

section on page 48.

43

Optional Hinged Access Doors — When the optional
service package is ordered or tlie if the hinged access doors
option is ordered, the unit will be provided with external and
internal hinged access doore to facilitate service.

Four external hinged access doors are provided. All externiil
doors ai'e provided with 2 large V4 turn latches with folding
biiil-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 tlie non-fused disconnect which must be in the
OFF position to open the door. Two doors aie provided for ac
cess to the compressor compartment.

SEE

Two internal access doors are provided inside the filtei/
drive access door. The filter access door (on the left) is secured
by 2 small '/4 turn latches witli folding bail-type handles. Tliis
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.

SEE

SPARK GAP .161"

Vj!=-

DETAIL "C"

Fig. 57 — Spark Gap Adjustment

44

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Fig. 59 — Typical Component Arrangement (48TJ016 Unit Shown)

46

LEGEND AND NOTES FOR FIG. 58 AND 59

AHA — Adjustable, Heat Anticipator

BKR W/AT — Breaks with Amp Turns
C — Contactor, Compressor
CAP — Capacitor
CB — Circuit Breaker
CC — Cooling Compensator
CLO — Compressor Lockout
COMP — Compressor Motor

DM — Damper Motor

DU — Dummy Terminal

EQUIP — Equipment

FPT — Freeze Protection Thermostat

FU — Fuse
GND — Ground

HPS — High-Pressure Switch
lAQ — Indoor Air Quality Sensor
IDM — Induced-Draft Motor
IFM — Indoor-Fan Motor
IGC — Integrated Gas Unit Controller

L — Light

LED — Light Emitting Diode

LPS — Low-Pressure Switch

LS — Limit Switch
MGV — Main Gas Vaive
NEC — National Electrical Code
OAT — Outdoor Air Temperature Sensor
OCCUP — Occupancy Sensor
OFC — Outdoor-Fan Contactor
OFM — Outdoor-Fan Motor

PL — Plug Assembly

PMR — Phase Monitor Relay
QT — Quadruple Terminal

RAT — Return Air Temperature Sensor

RS — Rollout Switch

LEGEND

SN — Sensor
TB — Terminal Block
TC — Thermostat Cooling
TH — Thermostat Heating
TRAN — Transformer

<; > Terminal (Marked)

Q Terminal (Unmarked)

I I Terminal Block

9 Splice

-----------

Factory Wiring

— Field Control Wiring

----------

Accessory or Optional Wiring

To indicate common potential only;
not to represent wiring.

°' ° Economizer Motor

—Remote POT Field Accessory

; OAT Sensor

Disch Air Sensor

; RAT Accessory Sensor

Low Ambient Lockout Switch

NOTES:

1. Compressor and/or tan motor(s) thermally protected three 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 or its
equivalent.

3. TRAN1 is wired for 230-v operation. If unit is 208 v, disconnect the black wires from the ORN TRAN
wire and reconnect to the RED TRAN wire. Apply wirenuts to wires.

4. CB1,2 Must Trip Amps are equal to or less than 156% FLA. IFCB 140%.

5. The CLO locks out the compressor to prevent short cycling on compressor overload and safety devices;
before replacing CLO check these devices.

6. Jumpers are omitted when unit is equipped with economizer.

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

8. Remove Jumper between RC and RH.

9. 620 Ohm, 1 watt, 5% resistor should be removed only when using differential enthalpy or dry bulb.

10. If a separate field-supplied 24 v transformer is used for the lAQ sensor power supply, it cannot have the
secondary of the transformer grounded.

11. OAT sensor is shipped inside unit and must be relocated in the field for proper operation.

12. For field-installed remote minimum position POT. remove black wire jumper between P and PI and set
control minimum position POT to the minimum position.

47

TROUBLESHOOTING

Unit Troubleshooting — Refer to Tables 27 29 and

Fig. 60.

EconoMi$erlV Troubleshooting — See Table 30

for EconoMiSerlV logic.

A functional view of the EconoMi$erIV is shown in Fig. 61.
Typictil settings, sensor ranges, and jumper positions are also
shown. An EconoMi$erIV simulator program is available from
CiU'rier to help with EconoMi$erIV training and troubleshooting.

ECONOMI$ERIV PREPARATION---This procedure is
used to prepare the EconoMi$erIV for troubleshooting. No
troubleshooting or testing is done by performing the following
procedure.

NOTE: This procedure requires a 9-v batteiy, 1.2 kilo-ohm
resistor, and a .5.6 kilo-ohm resistor which are not supplied
with the EconoMi$erIV.

IMPORTANT: Be sure to record tire positions of all poten
tiometers before starting troubleshooting.

1. Disconnect power at TR and TRl. All LEDs should be
off. Exhaust fan contacts should be open.

2. Disconnect device at P and PI.

3. JumperP to PI.

4. Disconnect wires at T and T1. Place .5.6 kilo-ohm resistor
across T and T1.

5. Jumper TR to 1.

6. Jumper TR to N.

7. If connected, remove sensor from terminals So and -i-.
Connect 1.2 kilo-ohm 4074EJM checkout resistor across
terminals So and -I-.

8. Put 620-ohm resistor across terminals Sr and -i-.

9. Set minimum position, DCV set point, and exhaust
potentiometers fully CCW (counterclockwise).

10. Set DCV maximum position potentiometer fully CW
(clockwise).

11. Set entlialpy potentiometer to D.

12. Apply power (24 vac) to terminals TR and TRl.

DIFFERENTIAL ENTHALPY — To check differential
enthalpy:

1. Make sure EconoMl$erIV piepaation procedure has
been performed.

2. Place 620-ohm resistor across So and -i-.

3. Place 1.2 kilo-ohm resistor across Sr and -i-. The Free
Cool LED should be lit.

4. Remove 620-ohm resistor across So and -I-. The Free
Cool LED should turn off.

5. Return EconoMi$erJV settings and wiring to normiil
after completing troubleshooting.

SINGLE ENTHALPY — To check single enthalpy:

1. Make sure EconoMi$erIV prepiu'ation procedure has
been performed.

2. Set the enthalpy potentiometer to A (fully CCW). The
Free Cool LED should be lit.

3. Set the enthiilpy potentiometer to D (fully CW). The Free
Cool LED should turn off.

4. Return EconoMi$erIV settings and wiring to normal
after completing troubleshooting.

DCV (Demand Controlled Ventilation) AND POWER
EXHAUST-- To check DCV and Power Exhaust:

1. Make sure EconoMi$erIV prepai'ation procedure has
been performed.

2. Ensure terminals AQ and AQl ae open. The LED for
both DCV and Exhaust should be off Tire actuator
should be fully closed.

3. Connect a 9-v batteiy to AQ (positive node) and AQl
(negative node). Tire LED for both DCV and Exhaust

should turn on. The actuator should diive to between 90

and 95% open.

4. Turn tlie Exhaust potentiometer CW until tire Exhaust
LED turns off. The LED should turn off when the

potentiometer is approximately 90%. The actuator should

remain in position.

5. Turn the DCV set point potentiometer CW until the DCV
LED turns off. The DCV LED should turn off when the

potentiometer is approximately 9-v. The actuator should

drive fully closed.

6. Turn the DCV and Exhaust potentiometers CCW until
the Exhaust LED turns on. The exhaust contacts will
close 30 to 120 seconds after the Exhaust LED turns on.

7. Return EconoMi$erIV settings and wiring to normal
after completing troubleshooting.

DCV MINIMUM AND MAXIMUM POSITION — To check
the DCV minimum and maximum position:

1. Make sure EconoMi$erIV preparation procedure has
been peifonned.

2. Connect a 9-v batteiy to AQ (positive node) and AQl
(negative node). The DCV LED should turn on. Tire

actuator should diive to between 90 and 95% open.

3. Turn the DCV Maximum Position potentiometer to mid
point. Tire actuator should drive to between 20 and 80%

open.

4. Turn the DCV Maximum Position potentiometer to lltlly

CCW. Tire actuator should drive fully closed.

5. Turn the Minimum Position potentiometer to midpoint.

The actuator should diive to between 20 and 80% open.

6. Turn the Minimum Position Potentiometer folly CW. The

actuator should drive fully open.

7. Remove tlie jumper from TR and N. The actuator should

drive fully closed.

8. Return EconoMi$erIV settings and wiring to nonntil

after completing troubleshooting.

SUPPLY-AIR INPUT — To check supply-air input:

1. Make sure EconoMi$erIV preparation procedure has
been peifonned.

2. Set the Entlialpy potentiometer to A. The Free Cool LED
turns on. The actuator should drive to between 20 and

80% open.

3. Remove the 5.6 kilo-ohm resistor and jumper T to T1.
The actuator should diive folly open.

4. Remove tlie jumper across T and T1. The actuator should
drive fully closed.

5. Return EconoMi$erIV settings and wiring to normal
after completing troubleshooting.

ECONOMISER IV TROUBLESHOOTING COMPLE
TION — This procedure is used to return the EconoMi$erIV
to operation. No troubleshooting or testing is done by perform
ing the following procedure.

1. Di sconnect power at TR and TR 1.

2. Set enthalpy potentiometer to previous setting.

3. Set DCV maximum position potentiometer to previous

setting.

4. Set minimum position, DCV set point, and exhaust

potentiometers to previous settings.

5. Remove 620-ohm resistor from terminals Sr and -i-.

6. Remove 1.2 kilo-ohm checkout resistor from terminals So
and -I-. If used, reconnect sensor from tenninals So and -I-.

7. Remove jumper from TR to N.

8. Remove jumper from TR to 1.

9. Remove 5.6 kilo-ohm resistor from T and T1. Reconnect
wires at T and T1.

10. Remove jumper from P to PI. Reconnect device at P and
PI.

11. Apply power (24 vac) to terminttls TR and TRl.

48

Table 27 — Cooling Service Analysis

PROBLEM CAUSE REMEDY

Compressor and
Condenser Fan
Will Not Start.

Compressor Will Not
Start but Condenser Fan

Runs.

Compressor Cycles
(other than normally
satisfying thermostat).

Compressor Operates
continuously.

Excessive Head
Pressure.

Head Pressure Too Low. Low refrigerant charge. Check for leaks, repair, and recharge.

Excessive Suction
Pressure.

Suction Pressure Too

Low.

LEGEND

TXV — Thermostatic Expansion Vaive

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.
Three phase power incorrectly connected (sizes Of 6 and

020 only). Indicated by flashing red LED on Phase Moni
tor Relay (PMR) board (see Control Box Component
Arrangement for location).

Correct field power phasing.

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.

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.
Dirty air filter. Replace filter.
Unit undersized for load. Decrease load or increase unit size.
Thermostat set too low. Reset thermostat.
Low refrigerant charge. Locate leak, repair, and recharge.
Air in system. Recover refrigerant, evacuate system, and recharge.
Condenser coil dirty or restricted. Clean coil or remove restriction.
Dirty air filter. Replace filter.
Dirty condenser coil. Clean coil.
Refrigerant overcharged. Recover excess refrigerant.
Faulty TXV. 1. Check TXV bulb mounting and secure tightly to

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.

Restriction in liquid tube. Remove restriction.
High heat load. Check for source and eliminate.
Faulty TXV. 1. Check TXV bulb mounting and secure tightly to

suction line.

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

suction line.

2. Replace TXV if stuck open or dosed.
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.

49

Table 28 — Heating Service Analysis

PROBLEM CAUSE REMEDY

Burners Will Not
Ignite.

Inadequate Heating. Dirty air filter. Clean or replace filter as necessary.

Poor Flame
Characteristics.

Burners Will Not Turn
Off.

Misaligned spark electrodes. Check flame ignition and sensor electrode positioning.

No gas at main burners. Check gas line for air; purge as necessary. After purging

Water in gas line. Drain water and install drip leg to trap water.

No power to furnace. Check power supply, fuses, wiring, and circuit breaker.
No 24 V power supply to control circuit. Check transformer. Transformers with internal overcur

Miswired or loose connections. Check all wiring and wire nut connections.
Burned-out heat anticipator in thermostat. Replace thermostat.
Broken thermostat wires. Run continuity check. Replace wires if necessary.

Gas input to unit too low. Check gas pressure at manifold. Check gas meter for

Unit undersized for application. Replace with proper unit or add additional unit.
Restricted airflow. Clean filter, replace filter, or remove any restrictions.
Blower speed too low. Install alternate motor, if applicable, or adjust pulley to

Limit switch cycles main burners. Check rotation of blower, thermostat heat anticipator set

Too much outdoor air. Adjust minimum position.

Incomplete combustion (lack of combustion air)
results in:

Aldehyde odors, CO, sooting flame, or floating flame.

Unit is locked into Heating mode for a one minute
minimum.

Adjust as needed.

gas line of air, allow gas to dissipate for at least 5 min
utes before attempting to relight unit.

Check gas valve.

rent protection require a cool-down period before
resetting. Check 24-v circuit breaker; reset if necessary.

input. If too low, increase manifold pressure or replace
with correct orifices.

increase fan speed.

tings, and temperature rise ot unit. Adjust as needed.

Check economizer operation.
Check all screws around flue outlets and burner com

partment. Tighten as necessary.
Cracked heat exchanger.
Overfired unit — reduce input, change orifices, or adjust

gas line or manifold pressure.
Check vent for restriction. Clean as necessary.
Check orifice to burner alignment.
Watt until mandatory one-minute time period has

elapsed or cycle power to unit.

Table 29 — MoistureMiSer™ Dehumidification Subcooler Service Analysis

PROBLEM CAUSE REMEDY

Subcooler Will Not Energize No power to subcooler control transformer. Check power source. Ensure all wire connections

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

Liquid line three-way valve will not operate. 1. Solenoid coil defective; 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

are tight.

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

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

3. Transformer bad; check transformer.

2. Solenoid valve stuck closed; replace.

section.

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

50

1 FLASH - ШЮОН FAN DELAY

МООИта (^SATING)

2 FLA&CS - OPENING OF UWKT

swnt>»

3 FLASHES - FLAPyE SEmOR

IfOtCAIES RAI«e WriN

CLO^D GAS VALVE

4 FLASHES - UWr SWiTCH

CYCim 4 TIMES CW SINGLE

CALL FOR HEAT

5 FLASHES - KSNmON LOCKOUT

(No i^iKxxi 15 n^iutes)

6 FLASHES ' »®UCe3 DRAFT

MOTCIR FALH.T

(No ^om t>e HaM Effect

Sensor for so 8eoorxi8)

7 FLA»1^ - OPENING OF

ROLlOUr SWITCH

-BASHING

COMPRESSC» &

OUnXXiR FAN MOTOR

STAfTT liym£DIATe.Y

1 ЖХ»ЮОЫ DBAY
FOR INDOOR FAN

COCXJNG OBAANO

CC»ff>I^SSOR AND

OUTDOOR FAN STOP

SATisFie:?

IMMEDIATELY

1. BLOWN 5 AMP

2. OEFECTWE 24V TRANS.

3. 8RO<ENWIf^

4. NO POWER TO Lihfir

'

E__________________________________

HEATING

'W1' FROM BASE CONTROL BOARD ENERGIZES
ON IGC - 1 MINUTE LOCK'ON

COMBUSrraN RBAY ON КЭС IS ENERGgED

COlieUSTlON RELAY BCRQEES IHOUGED DRAFT MOTOR (}0Щ ТЖОЦОН

Й= ЮМ IS T4JRNB4G AT СС«НВЛ’ ЗРШЭ (АТ LEAST 2400 RPM). HALL

B=FECT SENSOR SB4DS С<Ж1^СТ SIGNAL TO TE!»í»iAL 'Jf ON ЮС

те«|ШМ'см' ONK3C

I FUVSHfiS - HAICV«ARE OR

SOFTWARE FALft.T

9 FLASHES - SOFTWARE

LOCKOUT

30 ЖЮНО OFF DELAY

FOR MXX3RFAN

IGC SAI=ErY LOOC VWIU

OFF GAS VAL\^ AND SPARK

IGC «GM VCXTA3E

ТНАЫ8РС1?Ш^ CREATES A

10,000 VCXT SPARK FC« 5

SECONDS

AFTB? 45 SECX)NDS (C« L^ F im Ш^^G

HAS BEBÍ REDUCED DIE TO L»«T SVMTCH

TRIPS) ЮС WLL BCRGI^ BLOWBÍ RELAY

1= LlfcBT SWITCH AND RCXLOUT

SWITCH ARE CLO^, IGC SAFETY

1ОЭ0 mi INTIiATE K3NfnON

SEQL04CE

ЮС SAFETY LOQC C№4S GAS

VALVE FOR 5 SECONDS

SUBTRACT 5 ^COIDS {OR

ANOTHER 6SBXM)S) FROM

mOQR fm ON TIME DaAY

LEGEND
IGC — Integrated Gas Unit Controller
NOTE; Thermostat Fan Switch in the “AUTQ

position.

(DaAY EXmBBi BY 5 SECONDS FOR B»CH LMfT SVOTCH TiaP -

« S6CO№) BIjOWB? siutdff delay

MAXIMUM DBAY: 3 MNUTES)

F!g. 60 — IGC Control (Heating and Cooling)

51

Table 30 — EconoMI$erlV Input/Output Logic

INPUTS OUTPUTS

Demand Control

Ventilation (DCV)

Below set
(DCV LED Off)

High
(Free Cooling LED Off)

Low
(Free Cooling LED On)

Above set
(DCV LED On)

High
(Free Cooling LED Off)

Low
(Free Cooling LED On)

*For single enthalpy control, the module compares outdoor

enthalpy to the ABCD set point,

tPower at N terminal determines Occupied/Unoccupied setting:

24 vac (Occupied), no power (Unoccupied).

"Moduiatlon is based on the supply air sensor signal.

tfModulation is based on the DCV signal.

Enthalpy*

Outdoor Return

Low On On On On Minimum position Closed

High On On On Off Modulating** (between min.

Low On On On On

High On On On Off Modulating***

Y1 Y2

On Off On Off
Oft Off Off Off

On Off Off Off
Off Off Off Off Minimum position Closed

On Off On Off
Off Off Off Off

On Off Off Off
Off Off Off Off

Compressor

Stage1Stage

2

N Terminait

Occupied Unoccupied

Damper

Modulating** (between

position and full-open)

Modulafingtt (between min.
position and DCV maximum)

closed and full-open)

Modulafingtt (between
closed and DCV
maximum)

Modulafingttt

’"Modulation is based on the greater of DCV and supply air sensor

signals, between minimum position and either maximum position
(DCV) or fully open (supply air signal).

tttModulation is based on the greater of DCV and supply air sen

sor signals, between closed and either maximum position (DCV)
or fully open (supply air signal).

2 - IP №C

AClUATOR

' ■ t -nh-

Tc4r|-r-s*ofn "K

uU"?JÎ

l5rrr./;ta'iftr tY- ¡1 ji

I "ij-- ,i l•‘fr[■•=*^î<:l:lf

1

i

Fig. 61 — EconoMi$erlV Functional View

-

-----

,jm

52

Altitude compensation 10
Burner spark gap 44
Carrier Comfort Network® 17
Changeover set points 26
Charging chart, refrigerant 42
Clearance 5,6
CO2 sensor

Configuration 2d

Settings 27,29
Combustion blower wheel 40
Compressor

Lubrication 40

Mounting JI

Rotation JI
Concentric duct 9
Condensate drain

Cleaning 40

Location 9,10
Condenser coil 7

Cleaning J9

Condenser fan 7

Adjustment 42
Control circuit

Wiring 11
Convenience outlet 12
Crankcase heater il, 43
Demand control ventilation 28

Dehumidification 29
Dimensions 3-6
Ductwork 9
EconoMi$erIV 2.Î-29

Control mode 25
Controller wiring 24

Demand ventilation control 28

Dry bulb changeover 25

Enthalpy sensor 26

Troubleshooting 48,52

Usage 25

Wiring 24
EconoMi$er2 23,24
Electrical connections 11
Electrical data 13
Enthalpy changeover set points 27
Error codes 51
Evaporator coil 7

Cleaning 39

Evaporator fan motor

Eubrication 40

Motor data .36

Mounting 41

Performance 32-34

Pulley adjustment 41

Pulley setting 7, 55

Speed 7
Filter

Cleaning 40

Size 8
Filter drier 43
Flue collector box 40
Flue gas passageways 40
Flue hood 9
Freeze protection thermostat 8
Gas connection 8
Gas input 8
Gas piping 11
Gas pressure 1, 8, 11
Heat anticipator settings 8,11
High-pressure switch 8, 43
Hinged access doors 44
Horizontal adapter roof curb 2
Humidistat 29
Indoor air quality sensor /7
Integrated gas controller 51

Error codes 5 /
Liquid propane 10
Low-pressure switch 8, 43
Main burners 40, 43
Manual outdoor air damper 14

INDEX

MoistureMi$er™

dehumidification 29-31, 35, 42, 50
Motormaster® I control 15
Motorinaster V control 16
Mounting

Compressor 31

Unit 2
Natural gas 8, 43
Non-fused disconnect 12
Operating limits 16
Operating sequence 56-5(S

Cooling .36

EconoMi$erIV 36,37

EconoMi$er2 with

PremierLinki^^' control 37, 38

Heating .36,37
Outdoor air hood 14
Outdoor air temperature sensor 17, 25
Outdoor air inlet screens

Cleaning 40

Dimensions 8
Physical data 7, 8
Power supply 11

Wiring 11
PremierLink controls 17-20
Pressure, drop

Economizer 35

MoistureMi$er 35
Pressure switches

High pressure 8

Low pressure 8
Refrigerant

Charge 7,42

Type 7
Refrigerant servdce ports 31
Replacement parts 43
Return air filter 8, 36
Return air temperature sensor 26
Rigging unit 2, 4
Roof curb

Assembly 2
Dimensions 2,3
Leveling tolerances 2, 3

Weight 7
Safety considerations 1
Service 39-47
Start-up 31-38
Start-up checklist CL-!
Supply-air temperature sensor 17, 25
Thermostat 12
Troubleshooting 48-52
Weight

Corner ,5,6

EconoMi$erIV ,5-7

Maximum 4

Unit ,5-7
Wind baffle 15, 16
Wiring

EconoMi$erIV 24

EconoMi$er2 24

Humidistat .30

Non-fused disconnect 12

Power connections 11

PremierLink 18,20

Thermostat /2

Unit 45,46

-S3

SERVICE TRAINING

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

discussed in this manual, including;

Unit Familiarization
Installation Overview

Maintenance
Operating Sequence

A large selection of product, theoiy, 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 ciillbacks. Course
descriptions and schedules ;u'e in our catalog.

CALL FOR FREE CATALOG 1-800-644-5544

[ ] Packaged Seivice Training [ ] Classroom Service Training

Copyright 2006 Carrier Corporation

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

Tab lla 6a

Catalog No. 04-53480009-01 Printed in U.S.A. Form 48TJ-22SI Pg 54 3-06 Replaces: 4STJ-21 SIBook|l 4

START-UP CHECKLIST

MODEL NO.:
DATE:

____

______

SERIAL NO.:

TECHNICIAN:

PRE-START-UP

□ VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT
□ VERIFY INSTALLATION OF INDOOR FAN MOTOR ADJUSTMENT BOLT AND PLATE (48TJ020-028 ONLY)

□ VERIFY INSTALLATION OF OUTDOOR-AIR HOOD
□ VERIFY INSTALLATION OF FLUE HOOD AND WIND BAFFLE
□ VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS
□ VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT
□ CHECK GAS PIPING FOR LEAKS
□ 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

MOISTUREMISERTM DEHUMIDIFICATION SYSTEM ONLY)

START-UP

o

Q

0

Z

o

3
o

ELECTRICAL

SUPPLY VOLTAGE E1-L2 L2-L3 L3-L1
COMPRESSOR AMPS— COMPRESSOR NO. 1 LI L2 L3

— COMPRESSOR NO. 2 LI L2 L3

SUPPLY FAN AMPS

TEMPERATURES

OUTDOOR-AIR TEMPERATURE
RETURN-AIR TEMPERATURE
COOLING SUPPLY AIR
GAS HEAT SUPPLY AIR

PRESSURES

GAS INLET PRESSURE
GAS MANIFOLD PRESSURE
REFRIGERANT SUCTION
REFRIGERANT DISCHARGE

STAGE NO. 1 IN. WG STAGE NO, 2 IN. WG
CIRCUIT NO, 1 PSIG CIRCUIT NO. 2 PSIG
CIRCUIT NO. 1 PSIG CIRCUIT NO. 2 PSIG

EXHAUST FAN AMPS

F DB (Dry-Bulb)
F DB

________
F
F

IN. WG

F WB (Wet-Bulb)

□ VERIFY REFRIGERANT CHARGE USING CHARGING CHART ON PAGE 42.

GENERAL

□ ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS

O

Q

0

z
O

_i

<
H

3
o

Copyright 2006 Carrier Corporation

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

Book 1 |4 Catalog No. 04-53480009-01 Printed in U.S.A. Form 48TJ-22SÌ PgCL-1 3-06 Replaces: 48TJ-21SI
Tab lajea