Installation, Start-Up and Service Instructions CONTENTS

Installation, Start-Up and Service Instructions CONTENTS
48TJ016-028
Single-Package Rooftop Units
Electric Cooling/Gas Heating
Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31
Step 1 — Provide Unit Support . . . . . . . . . . . . . . . . . . . 2
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 2
• POSITIONING
• ROOF MOUNT
Step 3 — Field Fabricate Ductwork . . . . . . . . . . . . . . . 9
Step 4 — Make Unit Duct Connections . . . . . . . . . . . 9
Step 5 — Install Flue Hood and Wind Baffle . . . . . . 9
Step 6 — Trap Condensate Drain . . . . . . . . . . . . . . . . . 9
Step 7 — Orifice Change . . . . . . . . . . . . . . . . . . . . . . . . 10
Step 8 — Install Gas Piping . . . . . . . . . . . . . . . . . . . . . 11
Step 9 — Make Electrical Connections . . . . . . . . . . 11
• 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 . . . . . . . . . . . . . 14
Step 12 — Install All Accessories . . . . . . . . . . . . . . . 15
• MOTORMASTER® I CONTROL INSTALLATION
• MOTORMASTER V CONTROL INSTALLATION
Step 13 — Adjust Factory-Installed Options . . . . . 17
• PREMIERLINK™ CONTROL
• ENTHALPY SWITCH/RECEIVER
• OUTDOOR ENTHALPY CONTROL
• DIFFERENTIAL ENTHALPY CONTROL
• ENTHALPY SENSORS AND CONTROL
• OPTIONAL ECONOMI$ERIV AND
ECONOMI$ER2
• ECONOMI$ERIV STANDARD SENSORS
• ECONOMI$ERIV CONTROL MODES
Step 14 — Install Humidistat for
Optional MoistureMi$er™ Package. . . . . . . . . . . . 29
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31-38
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39-47
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 48-52
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of cleaning coils and filters and replacing filters. All other
operations should be performed by trained service personnel.
When working on air-conditioning equipment, observe
precautions in the literature, tags and labels attached to the unit,
and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for all brazing operations.
Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.
1. Improper installation, adjustment, alteration, service,
or maintenance can cause property damage, personal
injury, 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 this or any other
appliance.
What to do if you smell gas:
1. DO NOT try 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 neighbor’s phone. Follow the gas supplier’s instructions.
4. If you cannot reach your gas supplier, call the fire
department.
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 hazardous
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).
IMPORTANT: Units have high ambient operating limits. If limits are exceeded, the units will automatically
lock the compressor out of operation. Manual reset will
be required to restart the compressor.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480009-01
Printed in U.S.A.
Form 48TJ-22SI
Pg 1
3-06
Replaces: 48TJ-21SI
Book 1 4
Tab 1a 6a
INSTALLATION
Step 2 — Rig and Place Unit — Do not drop unit;
keep upright. Use spreader bars over unit to prevent sling or
cable damage. Rollers may be used to move unit across a roof.
Level by using unit frame as a reference; leveling tolerance is
±1/16 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 instructions 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 ventilation air 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 weatherproof, guard against water from
higher level runoff and overhangs.
Locate mechanical draft 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 assembly must be at least 7 ft above grade.
ROOF MOUNT — Check building codes for weight distribution requirements. Unit operating weight is shown in
Table 1.
Instructions continued on page 9.
Inspect unit for transportation damage. If damage is found,
file claim with transportation agency.
Step 1 — Provide Unit Support
ROOF CURB — Assemble and install accessory roof curb or
horizontal adapter roof curb in accordance with instructions
shipped with this accessory. 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 before unit is set in place. Curb or adapter roof curb should be
level. This is necessary to permit unit drain to function properly. Unit leveling tolerance is ± 1/16 in. per linear ft in any direction. Refer to Accessory Roof Curb or Horizontal Adapter
Roof Curb Installation Instructions for additional information
as required. When accessory 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 seal.
Install 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. Support 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.
3 1/2"
2" X 1/4
SUPPORT TYP.
STITCH WELDED
FULLY INSULATED
SUPPLY PLENUM
1" INSULATION
1 1/2 # DENSITY,
STICK PINNED & GLUED
14 3/4"
23"
6"
NOTE: CRRFCURB013A00 is a fully factory preassembled horizontal adapter and includes an insulated transition duct. The pressure drop through the adapter curb is negligible.
For horizontal return applications: The power exhaust and barometric relief dampers must be installed in the return air duct.
12" WIDE STANDING
SEAM PANELS
ACCESSORY
PACKAGE NO.
CRRFCURB013A00
CURB
HEIGHT
1′-11″
(584)
Fig. 1 — Horizontal Supply/Return Adapter Installation
2
DESCRIPTION
Pre-Assembled, Roof Curb,
Horizontal Adapter
3
CRRFCURB010A00
CRRFCURB011A00
CRRFCURB012A00
PKG. NO. REF.
CURB
HEIGHT
1′− 2″ (305)
2′- 0″ (610)
2′- 0″ (610)
DESCRIPTION
Fig. 2 — Roof Curb Details
Standard Curb 14″ High
Standard Curb for Units Requiring High Installation
Side Supply and Return Curb for High Installation
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.
All panels must be in place when rigging.
UNIT
48TJ
016
020
024
028
DIMENSIONS
MAXIMUM
SHIPPING WEIGHT
lb
1775
1875
1985
2135
A
kg
805
850
900
968
Ft-in.
6-111/2
6-111/2
6-111/2
6-111/2
B
mm
2121
2121
2121
2121
Fig. 3 — Rigging Details
4
Ft-in.
3-5
3-3
3-2
3-2
mm
1041
991
965
965
5
41
90
3-3
3-5
991
1041
Center of Gravity.
3-7
3-5
1092
1-8
508
1041 1-10 559
4.
Direction of airflow.
5. Ductwork to be attached to accessory roof curb only.
6. Minimum clearance:
• Rear: 7′-0″ (2134) for coil removal. This dimension can be reduced to
4′-0″ (1219) if conditions permit coil removal from the top.
• 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 0′-5/16″ (8) on each side
for top cover drip edge.
3.
NOTES:
1. Refer to print for roof curb accessory dimensions.
2. Dimensions in ( ) are in millimeters.
432 196 410 186 461 209 472 214
423 192 386 175 403 183 438 199
Fig. 4 — Base Unit Dimensions; 48TJ016,020
41
90
STD UNIT ECONOMIZER CORNER CORNER CORNER CORNER
DIM A
DIM B
DIM C
WEIGHT
WEIGHT
A
B
C
D
lb
kg
lb
kg
lb kg lb kg lb kg lb kg ft-in. mm ft-in. mm ft-in. mm
48TJD, 1650 748
TJF016
48TJD, 1800 816
TJF020
UNIT
6
41
90
Fig. 5 — Base Unit Dimensions; 48TJ024,028
41
90
3-2
3-2
965
965
3-5
3-5
1041
1041
1-8
1-8
508
508
4.
Direction of airflow.
5. Ductwork to be attached to accessory roof curb only.
6. Minimum clearance:
• Rear: 7′-0″ (2134) for coil removal. This dimension can be reduced to
4′-0″ (1219) if conditions permit coil removal from the top.
• 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 0′-5/16″ (8) on each
side for top cover drip edge.
NOTES:
1. Refer to print for roof curb accessory dimensions.
2. Dimensions in ( ) are in millimeters.
3.
Center of Gravity.
471 214 428 194 526 239 574 260
443 201 406 184 476 216 525 238
STD UNIT ECONOMIZER CORNER CORNER CORNER CORNER
DIM A
DIM B
DIM C
WEIGHT
WEIGHT
A
B
C
D
lb
kg
lb
kg
lb kg lb kg lb kg lb kg ft-in. mm ft-in. mm ft-in. mm
48TJD,
TJF024 1850 839
48TJD,
2000 907
TJF028
UNIT
Table 1 — Physical Data
016D/F
208/230, 460 v
15
1650
90
200
UNIT 48TJ
NOMINAL CAPACITY (tons)
OPERATING WEIGHT (lb)
Economizer
Roof Curb
COMPRESSOR
Quantity...Model (Ckt 1, Ckt 2)
Number of Refrigerant Circuits
Oil (oz) (Ckt 1, Ckt 2)
Stages of Capacity Control (%)
REFRIGERANT TYPE
Expansion Device
Operating Charge (lb-oz)
Circuit 1*
Circuit 2
CONDENSER COIL
2...SR*942AE
2
90, 90
50/50
Nominal Fan Shaft Diameter (in.)
Belt, Quantity...Type...Length (in.)
Pulley Center Line Distance (in.)
Speed Change per Full Turn of
Movable Pulley Flange (rpm)
Movable Pulley Maximum Full Turns
From Closed Position
Factory Speed
Factory Speed Setting (rpm)
Fan Shaft Diameter at Pulley (in.)
Bhp
TXV
024D/F
028D/F
18
1800
90
200
20
1850
90
200
25
2000
90
200
1...SM120,
1...SM110
2
110,110
52/48
1...SM161,
1...SM120
2
112, 110
56/44
Scroll
1...SM120,
1...SR*782AE
2
110, 72
60/40
R-22
TXV
15-2
16-3
21-0
11-5
14-8
15-4
Cross-Hatched
Copper Tubes, Aluminum Lanced,
Aluminum Pre-Coated, or Copper Plate Fins
2...17
3...15
3...15
4...15
21.7
21.7
21.7
21.7
Propeller Type
10,400
9300
13,700
12,500
3...22
3...22
2...30
2...30
1/2...1050
1/2...1050
1...1075
1...1075
1100
1100
3400
3400
Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced or
Copper Plate Fins, Face Split
2...17
3...15
3...15
4...15
17.5
17.5
17.5
17.5
Centrifugal Type
2...10 x 10
2...10 x 10
2...12 x 12
2...12 x 12
2...12 x 12
Belt
Belt
Belt
Belt
Belt
6000
6000
7200
8000
10,000
3.7
3.0
5
7.5
10
1725
1725
1745
1745
1740
8.7 [208/230, 575 v]
10.2 [208/230, 575 v]
4.25
3.45
5.90
9.5 [460 v]
11.8 [460 v]
3/8-in.
Rows...Fins/in.
Total Face Area (sq ft)
EVAPORATOR FAN
Quantity...Size (in.)
Type Drive
Nominal Cfm
Motor Hp
Motor Nominal Rpm
Maximum Continuous Bhp
Motor Bearing Type
Maximum Allowable Rpm
Motor Pulley Pitch Diameter
Min/Max (in.)
Nominal Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.)
020D/F
10-13
10-5
Rows...Fins/in.
Total Face Area (sq ft)
CONDENSER FAN
Nominal Cfm
Quantity...Diameter (in.)
Motor Hp...Rpm
Watts Input (Total)
EVAPORATOR COIL
Motor Frame Size
Nominal Rpm High/Low
Fan r/s Range
575 v
Low-Medium Static
High Static
Low-Medium Static
High Static
Low-Medium Static
High Static
Low-Medium Static
High Static
Low-Medium Static
High Static
Low-Medium Static
High Static
56H
—
891-1179
1227-1550
Ball
1550
3.1/4.1
3.7/4.7
7/8
6.0
5.2
13/16
1...BX...42
1...BX...42
13.5-15.5
48
55
56H
—
1159-1429
—
Ball
1550
4.3/5.3
—
7/8
6.4
—
13/16
1...BX...45
—
13.5-15.5
44
—
184T
—
910-1095
1069-1287
Ball
1550
4.9/5.9
4.9/5.9
11/8
9.4
8.0
17/16
1...BX...50
1...BX...48
13.3-14.8
37
34
213T
—
1002-1225
1193-1458
Ball
1550
5.4/6.6
5.4/6.6
13/8
9.4
7.9
17/16
1...BX...54
1...BX...50
14.6-15.4
37
44
215T
—
1066-1283
1332-1550
Ball
1550
4.9/5.9
4.9/5.9
13/8
8.0
6.4
17/16
2...BX...50
2...BX...47
14.6-15.4
36
45
5
3.5
1035
1389
13/16
5
3.5
1296
—
13/16
5
3.5
1002
1178
17/16
5
3.5
1120
1328
17/16
5
3.5
1182
1470
17/16
**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.
LEGEND
— Brake Horsepower
— Thermostatic Expansion Valve
*Circuit 1 uses the lower portion of condenser coil and lower portion of evaporator coils; and Circuit 2 uses the upper portion of both coils.
†Rollout switch is manual reset.
7
Table 1 — Physical Data (cont)
UNIT 48TJ
FURNACE SECTION
Rollout Switch Cutout Temp (F)†
Burner Orifice Diameter (in. ...drill size)
Natural Gas
Thermostat Heat Anticipator Setting (amps)
208/230, 575
Stage 1
Stage 2
460 v
Stage 1
Stage 2
Gas Input
Stage 1
Stage 2
Efficiency (Steady State) (%)
Temperature Rise Range
Manifold Pressure (in. wg)
Natural Gas
Gas Valve Quantity
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
Bhp
TXV
016D/F
020D/F
024D/F
028D/F
190
190
190
190
0.1285...30/0.136...29
0.1285...30/0.136...29
0.1285...30/0.136...29
0.1285...30/0.136...29
0.98
0.44
0.80
0.44
172,000/225,000
230,000/300,000
81
15-45/20-50
0.98
0.44
0.80
0.44
206,000/270,000
275,000/360,000
81
15-45/20-50
0.98
0.44
0.80
0.44
206,000/270,000
275,000/360,000
81
15-45/20-50
0.98
0.44
0.80
0.44
206,000/270,000
275,000/360,000
81
15-45/20-50
3.3
1
3/4
3.3
1
3/4
3.3
1
3/4
3.3
1
3/4
426
320
27
44
30 ± 5
45 ± 5
Cleanable
2...20 x 25 x 1
1...20 x 20 x 1
Throwaway**
4...20 x 20 x 2
4...16 x 20 x 2
1/2 Hp, 208/230-460 v Motor Direct Drive, Propeller-Fan (Factory-Wired for 460 v)
LEGEND
— Brake Horsepower
— Thermostatic Expansion Valve
**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.
*Circuit 1 uses the lower portion of condenser coil and lower portion of evaporator coils; and Circuit 2 uses the upper portion of both coils.
†Rollout switch is manual reset.
8
Step 3 — Field Fabricate Ductwork — Secure all
ducts to building structure. Use flexible duct connectors between unit and ducts as required. Insulate and weatherproof all
external ductwork, joints, and roof openings with counter
flashing and mastic in accordance with applicable codes.
Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.
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 fan housing. See Fig. 10.
Step 6 — Trap Condensate Drain — See Fig. 11
for drain location. One 3/4-in. half coupling is provided inside
unit evaporator section for condensate drain connection. An
81/2-in. x 3/4-in. diameter and 2-in. x 3/4-in. diameter pipe nipple, coupled to standard 3/4-in. diameter elbows, provide a
straight path down through hole in unit base rails (see Fig. 12).
A trap at least 4-in. deep must be used.
Step 4 — Make Unit Duct Connections — Unit
is shipped for thru-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 curb basepans.
NOTE: Dimensions A, A′, and B′ are obtained from field-supplied
ceiling diffuser.
Shaded area indicates block-off panels.
NOTE: Do not drill in this area; damage to basepan may result in
water leak.
Fig. 8 — Concentric Duct Details
Fig. 6 — Air Distribution — Thru-the-Bottom
WIND
BAFFLE
NOTE: Do not drill in this area; damage to basepan may result in
water leak.
Fig. 7 — Concentric Duct Air Distribution
Fig. 9 — Flue Hood Location
9
Step 7 — Orifice Change — This unit is factory as-
INDUCED DRAFT
MOTOR
sembled for heating operation using natural gas at an elevation
from sea level to 2000 ft. This 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 accessory high
altitude kit when installing this unit at an elevation of 2000 to
7000 ft. For elevations above 7000 ft, refer to Table 2 to identify the correct orifice size for the elevation. See Table 3 for the
number of orifices required for each unit size. Purchase these
orifices from your local Carrier dealer. Follow instructions in
accessory Installation Instructions to install the correct orifices.
Table 2 — Altitude Compensation*
ELEVATION (ft)
COMBUSTION
FAN HOUSING
MAIN BURNER
SECTION
0-1,999
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
HEAT EXCHANGER
SECTION
Fig. 10 — Combustion Fan Housing Location
NATURAL GAS ORIFICE†
Low Heat
High Heat
30
29
30
29
31
30
31
30
31
30
31
30
32
31
32
31
33
31
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.
†Orifices available through your Carrier dealer.
Table 3 — Orifice Quantity
UNIT
48TJD016
48TJD020,
48TJD024,
48TJD028,
48TJF016
48TJF020,
48TJF024,
48TJF028
3/4" FPT DRAIN
CONNECTION
ORIFICE QUANTITY
5
6
7
CONVERSION TO LP (Liquid Propane) GAS — Use accessory LP gas conversion kit when converting this unit for use
with 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 the elevation. See Table 3 for the number of orifices
required for each unit size. Purchase these orifices from your
local Carrier dealer. Follow instructions in accessory Installation Instructions to install the correct orifices.
1-3/8"
DRAIN HOLE
Fig. 11 — Condensate Drain Details
(48TJ016 Shown)
Table 4 — LP Gas Conversion*
ELEVATION (ft)
0-1,999
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
LP GAS ORIFICE†
36
37
38
38
39
40
41
41
42
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.
†Orifices available through your Carrier dealer.
Fig. 12 — Condensate Drain Piping Details
10
Step 8 — Install Gas Piping — Unit is equipped for
use with natural gas. Installation must conform with local
building codes or, in the absence of local codes, with the
National Fuel Gas Code, ANSI Z223.1.
Install field-supplied manual gas shutoff valve with a 1/8-in.
NPT pressure tap for test gage connection at unit. Field gas piping must include sediment trap and union. See Fig. 13.
Transformer no. 1 is wired for 230-v unit. If 208/230-v unit
is to be run 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.
Do not pressure test gas supply while connected to unit.
Always disconnect union before servicing. Exceeding
maximum manifold pressure may cause explosion and
injury.
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
accessory thermostat assembly according to installation instructions included with accessory. Locate thermostat assembly
on a solid interior wall in the conditioned space to sense average 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 runs 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
the thermostat and will require a junction box and splice at the
thermostat.
Set heat anticipator settings as follows:
IMPORTANT: Natural gas pressure at unit gas connection must not be less than 5.5 in. wg or greater than
13.5 in. wg.
Size gas-supply piping for 0.5-in. wg maximum pressure
drop. Do not use supply pipe smaller than unit gas connection.
Fig. 13 — Field Gas Piping
VOLTAGE
208/230,575
460
Step 9 — Make Electrical Connections
W1
0.98
0.80
W2
0.44
0.44
Settings may be changed slightly to provide a greater degree
of comfort for a particular installation.
FIELD POWER SUPPLY — Unit is factory wired for voltage shown on nameplate.
When installing units, provide a disconnect per NEC (National 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.
The correct power phasing is critical in the operation of the
scroll compressors. An incorrect phasing will cause the
compressor to rotate in the wrong direction. This may lead
to premature compressor failure.
EQUIP
GND
NEC
TB
The unit must be electrically grounded in accordance with
local codes and NEC ANSI/NFPA 70 (National Fire Protection Association) to protect against fire and electric
shock.
—
—
—
—
LEGEND
Equipment
Ground
National Electrical Code
Terminal Block
NOTE: The maximum wire size for TB1 is 2/0.
Fig. 14 — Field Power Wiring Connections
Field wiring must confirm to temperature limitations for
type “T” wire. All field wiring must comply with NEC and local requirements.
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 disconnect switch. Refer to the applicable disconnect wiring diagram.
To prevent breakage during shipping, the disconnect handle
and shaft are shipped and packaged inside the unit control box.
Install the disconnect handle before unit operation. To install
the handle and shaft, perform the following procedure:
1. Open the control box door and remove the handle and
shaft from shipping location.
2. Loosen the Allen bolt located on the disconnect switch.
The bolt is located on the square hole and is used to hold
the shaft in place. The shaft cannot be inserted until the
Allen bolt is moved.
3. Insert the disconnect shaft into the square hole on the disconnect switch. The end of the shaft is specially cut and
the shaft can only be inserted in the correct orientation.
4. Tighten the Allen bolt to lock the shaft into position.
5. Close the control box door.
6. Attach the handle to the external access door with the two
screws provided. When the handle is in the ON position,
the handle will be vertical. When the handle is in the OFF
position, the handle will be horizontal.
7. Turn the handle to the OFF position and close the door.
The handle should fit over the end of the shaft when the
door is closed.
8. The handle must be in the OFF position to open the control box door.
OPTIONAL CONVENIENCE OUTLET — On units with
optional convenience outlet, a 115-v GFI (ground fault interrupt) convenience outlet receptacle is provided for field wiring.
Field wiring should be run through the 7/8-in. knockout provided in the basepan near the return air opening.
THERMOSTAT ASSEMBLY
REMOVABLE JUMPER
Y2
W1
W2
G
C
R
Y1
Y2
W1
W2
G
C
X
RED
BLU
PNK
ORN
VIO
BLK
BRN
WHT
L
Y1
RH
RC
X
Fig. 15 — Field Control Thermostat Wiring
6T3 4T2 2T1 LOAD
5L3 3L2 1L1 LINE
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
HACR
IFM
LRA
MCA
MOCP
NEC
OFM
RLA
—
—
—
—
—
—
—
—
—
NOMINAL
VOLTAGE
(3 Ph, 60 Hz)
Min
Max
COMPRESSOR
No. 1
No. 2
RLA LRA RLA LRA
208/230
187
253
25.6
190
25.6
460
414
508
13.5
95
575
518
632
10.2
208/230
187
253
460
414
575
VOLTAGE
RANGE
OFM
POWER
EXHAUST
IFM
Qty
Hp
FLA (ea)
Hp
FLA
190
3
0.5
1.7
3.7
10.5/11.0
13.5
95
3
0.5
0.8
3.7
4.8
75
10.2
75
3
0.5
0.8
3.0
3.9
33
237
23
184
3
0.5
1.7
5.0
15.8/15.8
508
16.2
130
10.2
90
3
0.5
0.8
5.0
7.9
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
FLA
—
4.6
—
2.3
—
2.1
—
4.6
—
2.3
—
2.1
—
4.6
—
2.3
—
2.1
—
4.6
—
2.3
—
2.1
COMBUSTION
FAN MOTOR
LRA
—
18.8
—
6.0
—
4.8
—
18.8
—
6.0
—
4.8
—
18.8
—
6.0
—
4.8
—
18.8
—
6.0
—
4.8
FLA
0.57
0.57
0.30
0.30
0.57
0.57
0.57
0.57
0.30
0.30
0.57
0.57
0.57
0.57
0.30
0.30
0.57
0.57
0.57
0.57
0.30
0.30
0.57
0.57
POWER
SUPPLY
MCA
74/74
79/79
38
40
30
32
85/85
90/90
41
43
33
35
109/109
114/114
54
56
44
46
134/134
138/138
66
68
55
57
MOCP*
90/90
100/100
50
50
35
40
110/110
110/110
50
50
45
45
125/125
125/125
70
70
50
50
175/175
175/175
80
90
70
70
Example: Supply voltage is 460-3-60.
LEGEND
Full Load Amps
Heating, Air Conditioning and Refrigeration
Indoor (Evaporator) Fan Motor
Locked Rotor Amps
Minimum Circuit Amps
Maximum Overcurrent Protection
National Electrical Code
Outdoor (Condenser) Fan Motor
Rated Load Amps
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
=
*Fuse or HACR circuit breaker.
452 + 464 + 455
3
1371
3
= 457
Determine maximum deviation from average voltage.
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
7
% Voltage Imbalance = 100 x
457
NOTES:
1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NEC Articles 430 and 440), the overcurrent protective
device for the unit shall be fuse or HACR breaker. Canadian units may be
fuse or circuit breaker.
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 voltage imbalance.
% Voltage Imbalance
max voltage deviation from average voltage
= 100 x
average voltage
= 1.53%
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.
13
Step 10 — Make Outdoor-Air Inlet Adjustments
MANUAL OUTDOOR-AIR DAMPER — All units (except
those equipped with a factory-installed economizer) have a
manual outdoor-air damper to provide ventilation air.
Damper can be preset to admit up to 25% outdoor air into
return-air compartment. To adjust, loosen securing screws and
move damper to desired setting, then retighten screws to secure
damper (see Fig. 17).
Fig. 18 — Outdoor-Air Hood Component Location
Fig. 17 — Standard 25% Outdoor-Air
Section Details
Step 11 — Install Outdoor-Air Hood
IMPORTANT: If the unit is equipped with the optional
EconoMi$erIV, move the outdoor air temperature sensor
prior to installing the outdoor air hood. See the Optional
EconoMi$erIV and EconoMi$er2 section for more details.
Fig. 19 — Seal Strip Location
The outdoor- air hood is common to 25% air ventilation and
economizer. If EconoMi$erIV is used, all electrical connections have been made and adjusted at the factory. Assemble
and install hood in the field.
NOTE: The hood top panel, upper and lower filter retainers,
hood drain pan, baffle (size 024 and 028), and filter support
bracket are secured opposite the condenser end of the unit. The
screens, hood side panels, remaining section of filter support
bracket, seal strip, and hardware are in a package located
inside the return-air filter access panel (Fig. 18).
1. Attach seal strip to upper filter retainer. See Fig. 19.
2. Assemble hood top panel, side panels, upper filter retainer, and drain pan (see Fig. 20).
3. 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 install
screws removed in Step 5.
8. Insert outdoor-air inlet screens and spacer in channel created by lower filter retainer and filter support bracket.
BAFFLE
LOWER FILTER
RETAINER
FILTER SUPPORT
BRACKET
HOOD TOP
PANEL
HOOD SIDE
PANELS (2)
BAFFLE
(024 TO
028 ONLY)
LOWER
FILTER
RETAINER
FILTER SUPPORT
BRACKET
HOOD DRAIN PAN
UPPER FILTER RETAINER
Fig. 20 — Outdoor-Air Hood Details
14
Step 12 — Install All Accessories — Install all
field-installed accessories. Refer to the accessory installation
instructions included with each accessory.
MOTORMASTER® I CONTROL INSTALLATION
(48TJ016,020 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
details. Use 20-gage, galvanized sheet metal, or similar
corrosion-resistant metal for baffles. Use field-supplied screws
to attach baffles to unit. Screws should be 1/4-in. diameter and
5/8-in. long. Drill required screw holes for mounting baffles.
Install Motormaster I Controls — Only one Motormaster I
control is required per unit. The Motormaster I control must be
used in conjunction with the Accessory 0° F Low Ambient Kit
(purchased separately). The Motormaster I device controls outdoor fan no. 1 while outdoor fans no. 2 and 3 are sequenced off
by the Accessory 0° F Low Ambient Kit.
Accessory 0° F Low Ambient Kit — Install the Accessory 0° F
Low Ambient Kit per instruction supplied with accessory.
Sensor Assembly — Install the sensor assembly in the location
shown in Fig. 22.
Motor Mount — To ensure proper fan height, replace the existing motor mount with the new motor mount provided with
accessory.
Transformer (460 and 575-v Units Only) — On 460 and 575-v
units, a transformer is required. The transformer is provided
with the accessory and must be field-installed.
Motormaster I Control — Recommended mounting location is
on the inside of the panel to the left of the control box. The
control should be mounted on the inside of the panel, vertically, with leads protruding from bottom of extrusion.
To avoid damage to the refrigerant coils and electrical components, use recommended screw sizes only. Use care
when drilling holes.
SENSOR
LOCATION
SENSOR
LOCATION
NOTE: Dimensions in ( ) are in mm.
Fig. 21 — Wind Baffle Details
HAIRPIN END
HAIRPIN END
48TJ016
48TJ020
NOTE: All sensors are located on the eighth hairpin up from the
bottom.
Fig. 22 — Motormaster I Sensor Locations
15
MOTORMASTER® V CONTROL INSTALLATION
(48TJ024,028 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
details. Use 20-gage, galvanized sheet metal, or similar corrosion-resistant metal for baffles. Use field-supplied screws to attach baffles to unit. Screws should be 1/4-in. diameter and
5/ -in. long. Drill required screw holes for mounting baffles.
8
To avoid damage to the refrigerant coils and electrical components, use recommended screw sizes only. Use care
when drilling holes.
B
13B
13C
12 13A
2
256
Install Motormaster V Controls — The Motormaster V
(MMV) control is a motor speed control device which adjusts
condenser fan motor speed in response to declining liquid refrigerant pressure. A properly applied Motormaster V control
extends the operating range of air-conditioning systems and
permits operation at lower outdoor ambient temperatures.
The minimum ambient temperatures at which the unit will
operate are:
Standard
Unit
40
BLU
YEL
BLK
FROM FUSE BLOCK
TO PRESSURE
TRANSDUCER
2
1
3
TO MOTOR(S)
Fig. 23 — Motormaster V Control
TEMPERATURE OPERATING LIMITS — F°
Unit with
Unit with
Low Ambient Kit
MMV Control
25
–20
Table 6 — Motormaster V Control Package Usage
To operate down to the ambient temperatures listed,
Motormaster V controls (Fig. 23) must be added. Field-fabricated and installed wind baffles are also required for all units (see
Fig. 21). The Motormaster V control permits operation of the
unit to an ambient temperature of –20 F. The control regulates the
speed of 3-phase fan motors that are compatible with the control.
These motors are factory installed.
See Table 6 for the Motormaster V control accessory package 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 factory-installed fan motors. Only field
wiring control is required.
Install the Motormaster V control per instructions supplied
with accessory.
UNIT
48TJ024,028
VOLTAGE
208/230
460
575
ITEM DESCRIPTION
CRLOWAMB015A00
CRLOWAMB016A00
CRLOWAMB017A00
Table 7 — Applicable Voltages and Motors
VOLTAGE
208/230-3-60
460-3-60
575-3-60
16
COMPATIBLE MOTOR
HD52AK654
HD52AK654
HD52GE576
Step 13 — Adjust Factory-Installed Options
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 the 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
the supply-air opening or in the supply air duct (as required by
local codes). Drill or punch a 1/2-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 the discharge 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 factory-mounted PremierLink control, the
outdoor-air temperature sensor (OAT) is factory-supplied and
wired.
Install the Indoor Air Quality (CO2) Sensor — Mount the
optional indoor air quality (CO2) sensor according to manufacturer specifications.
A separate field-supplied transformer must be used to
power the CO2 sensor.
Wire the CO2 sensor to the COM and IAQI terminals of J5
on the PremierLink controller. Refer to the PremierLink Installation, Start-up, and Configuration Instructions for detailed
wiring and configuration information.
PREMIERLINK™ CONTROL — The PremierLink controller is available as a special order from the factory and is compatible with the Carrier Comfort Network® (CCN) system.
This control is designed to allow users the access and ability to
change factory-defined 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 with the PremierLink controller.
The PremierLink controller (see Fig. 24) requires the use of
a Carrier electronic thermostat or a CCN connection for time
broadcast to initiate its internal timeclock. This is necessary for
broadcast of time of day functions (occupied/unoccupied). No
sensors are supplied with the field-mounted PremierLink control. The factory-installed PremierLink control includes only
the supply-air temperature (SAT) sensor and the outdoor air
temperature (OAT) sensor as standard. 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 wiring. 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 factory-mounted PremierLink control, the supply-air temperature (SAT) sensor (33ZCSENSAT)
is factory-supplied and wired. The wiring is routed from the
PremierLink control over the control box, through a grommet,
Fig. 24 — PremierLink Controller
17
18
Y2
W1
W2
G
C
X
Y2
W1
W2
G
C
X
SFS
NOT USED
RMTOCC
C
X
X
C
G
W2
W1
12
1
WHT
12
RED
2
2
PL1
PL1-2
RED
RED
BRN
1
3
2
WHT
BLK
BRN
4-20ma
ECONO
MOTOR
ECONOMIZER
50TJ401148
(CRECOMZR010B00)
TB2-C
BRN
ENTH
BRN
GRAY
ECONO
PLUG
1
BLK
FIELD
THERMOSTAT*
PL1-1
RED
ORN
NOT USED
Fig. 25 — PremierLink™ Controls Wiring
*If PremierLink control is in thermostat mode.
†TB2 terminal designations for 24 vac discrete inputs. Default is for DDC control.
FSD
Y2
Y1
R
BRN
26
25
RED
PNK
PWR
J1
ENTH
W2
W1
Y2
SWITCH
POSITION 0
POSITION 1
-
CCN/LEN
+
1
0
1234
RED
NOT
USED
PL1-12
PNK
FROM
PL1-9
PL1
9
BLU
RED
W
WHT
ORN
FROM
IGC-W
RED
W2
VIO
FROM
MGV-W2
MGV
ORN
IGC
R
RED
RED
FROM
IGC-R
RED
HS3/
EXH/
PWR
RVS
PNK ORN RED
HS2
RED
PNK
WHT
HS1
RED
BLU
IGC
RELAYS
YEL
CMP1 CMP2
GRN
FAN
RELAYS
LEGEND
Compressor Lockout
Compressor
Economizer
Enthalpy Sensor
Integrated Gas Unit Controller
Main Gas Valve
Outdoor Air Temperature Sensor
Plug
Supply Air Temperature Sensor
Space Temperature Sensor
Terminal Block
BLU
FROM
PL1-8
8
PL1
G
WHT
OR
BLK
FROM
IGC-G
RED
YEL
J8
CUT FOR DUAL
TRANSFORMER
EQUIPMENT
4
NO ACTION
LOAD FACTORY DEFAULTS ON POWERUP
CCN
PremierLink
Control
1
LEN
NOT
J7 USED
IGC
GRN
BRN VIO
GND +4-20
ECONO
J9
CLO
—
CMP
—
ECONO —
ENTH —
IGC
—
MGV
—
OAT
—
PL
—
SAT
—
SPT
—
TB
—
FROM 24V
UNIT
TRANSFORMER
ECONO
SERVICE/
NAVIGATOR PORT
J3
CUT TO ISOLATE POWER SUPPLY TO CONTROLLER
VIO
RED
J2
RED
RED
RED
ORN
WHT
RED
PNK
Y1
BLK
†
TB2†
Y1
BRN
C
ORN
24
23
SFS
FSD
CMPSAFE
RMTOCC
DDC
CONTROL
OAQ
COM
IAQI
COM
OAT
RED
BLU
RED
G
TSTAT CONTROL
GRN
RED
YEL
WHT
CMP SAFE
Y1
DDC CONTROL
TB2
X
C
G
W2
TRAN1
RED
RED
WHT
21
22
RED
BLU
RED
YEL
RED
GRN
20
19
18
17
16
15
BLU
BRN
RED
BRN
VIO
BRN
DISCRETE
TSTAT CONTROL
WHT
Y2
W1
PNK
RED
RED
RED
RED
14
13
12
11
10
9
8
7
COM
SAT
COM
J4
WHT
BLU
YEL
GRN
BLU
BRN
BRN
RED
RED
BRN
ORN
BRN
0-20mA IN
Y1
R
VIO
6
5
STO
J5
RED
R
PNK
VIO
BRN
BRN
SPT
COM
DISCRETE
CLO1
X
BLU
PL1 - 6
ORN
BLK
BRN
BLU
ANALO G
OAT
SAT
PL1 - 5
GRN
WHT
4
3
J6
BLK
2
BRN
1
BLUE
J4
Table 8 — PremierLink™ 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)
OUTDOOR AIR
TEMPERATURE SENSOR
RETURN AIR
TEMPERATURE SENSOR
OUTDOOR AIR
ENTHALPY SENSOR
RETURN AIR
ENTHALPY SENSOR
Included —
HH79NZ039
Required —
33ZCT55SPT
or Equivalent
—
—
Included —
Not Used
—
Included —
Not Used
—
Required —
33CSENTHSW
(HH57ZC003)
or
HH57AC077
Required —
33CSENTHSW
(HH57ZC003)
or
HH57AC077
—
Required —
33CSENTSEN
or
HH57AC078
*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):
33ZCSENCO2 — Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.
33ZCASPCO2 — Aspirator box used for duct-mounted CO2 room sensor.
33ZCT55CO2 — Space temperature and CO2 room sensor with override.
33ZCT56CO2 — 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 — 50HJ540570 — Opens at 35 F, closes at 50 F.
intake). The 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
3/4-in. TEK screws. Insert the screws through the holes in the
sides of the enthalpy switch/receiver.
Wiring — Carrier 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 1/4-in. female spade
connectors.
A 24-vac transformer is required to power the enthalpy
switch/receiver; as shown in Fig. 29, the PremierLink™ board
provides 24 vac. Connect the GND and 24 VAC terminals on
the enthalpy switch/receiver to the terminals on the transformer. On some applications, the power from the economizer harness 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 economizer harness.
For connection to rooftop units with PremierLink™ control,
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 PremierLink control board if desired. Wire the 24 VAC terminal on the enthalpy
switch/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.
ENTHALPY SWITCH/RECEIVER — The accessory enthalpy switch/receiver (33CSENTHSW) senses temperature
and humidity of the air surrounding the device and calculates
the enthalpy when used without an enthalpy sensor. The relay is
energized when enthalpy is high and deenergized when enthalpy is low (based on ASHRAE [American Society of Heating, Refrigeration and Air Conditioning Engineers] 90.1 criteria). If an accessory enthalpy sensor (33CSENTSEN) is attached to the return air sensor input, then differential enthalpy is
calculated. The relay is energized when the enthalpy detected by
the return air enthalpy sensor is less than the enthalpy at the enthalpy switch/receiver. The relay is deenergized when the enthalpy detected by the return air enthalpy sensor is greater than
the enthalpy at the enthalpy switch/receiver (differential enthalpy control). See Fig. 26 and 27.
OUTDOOR ENTHALPY CONTROL (Fig. 28) — Outdoor
enthalpy control requires only an enthalpy switch/receiver
(33CSENTHSW). The enthalpy switch/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 dry bulb temperature is above 75 F and is deenergized when the outdoor
enthalpy is below 27 BTU/lb AND dry 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 altitude of 1000 ft above sea level.
Mounting — Mount the enthalpy switch/receiver in a location
where the outdoor air can be sampled (such as the outdoor air
19
Fig. 26 — Enthalpy Switch/Receiver Dimensions
(33CSENTHSW)
Fig. 27 — Enthalpy Sensor Dimensions
(33CSENTSEN)
*Used with Differential Enthalpy Control only.
Fig. 28 — Typical Wiring Schematic — Carrier Rooftop Unit with PremierLink™ Controls
20
The PremierLink™ board provides 24-vac to power the
enthalpy switch/receiver. Connect the GND and 24 VAC terminals on the enthalpy switch/receiver to the terminals on
the transformer. On some applications, the power from the
economizer harness 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 economizer 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 PremierLink control board if desired. Wire the 24VAC terminal on the
enthalpy switch/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 enthalpy sensor. Connect the 24-36 VDC OUT terminal on the
enthalpy switch/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 enthalpy
switch/receiver. The other jumper is not used. To access the
jumpers, remove the 4 screws holding the cover on the
enthalpy switch/receiver and then remove the cover. The factory settings for the jumpers are M1 and OFF.
The mode jumper should be set to M2 for differential enthalpy control. The factory test jumper should remain on OFF
or the enthalpy switch/receiver will not calculate enthalpy.
DIFFERENTIAL ENTHALPY CONTROL (Fig. 29) —
Differential enthalpy control requires both an enthalpy switch/
receiver (33CSENTHSW) and an enthalpy 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 calculates the enthalpy of the indoor air.
The enthalpy switch/receiver energizes the HI Enthalpy relay output when the outdoor enthalpy is greater than the indoor
enthalpy. The LOW Enthalpy terminal is energized when the
outdoor enthalpy is lower than the indoor enthalpy. 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 altitude of 1000 ft above sea level.
Mounting — Mount the enthalpy switch/receiver in a location
where the outdoor air can be sampled (such as the outdoor air
intake). The enthalpy switch/receiver is not a NEMA 4 enclosure 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 3/4-in. TEK screws. Insert the screws
through the holes in the sides of the enthalpy switch/receiver.
Mount the enthalpy sensor in a location where the indoor air
can be sampled (such as the return air duct). The 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 3/4-in. TEK screws. Insert
the screws through the holes in the 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 1/4-in. female spade connectors.
120 VAC
LINE VOLTAGE
24 VAC
SECONDARY
24 VAC OUTPUT FROM N/C CONTACT WHEN THE
OUTDOOR ENTHALPY IS LESS THAN THE
ORN
INDOOR ENTHALPY
24 VAC OUTPUT FROM N/O CONTACT WHEN THE
INDOOR ENTHALPY IS GREATER THAN THE
OUTDOOR ENTHALPY
4-20 24-36
mA VDC
IN OUT
HI LOW GND 24
ENTHALPY
VAC
24-36 4-20
VDC mA
IN OUT
33CSENTHSW
33CSENTSEN
JUMPER SETTINGS FOR 33CSENTHSW
0%
50%
OFF
100%
M1
21
M2
Fig. 29 — Differential Enthalpy Control Wiring
M3
0%
50%
OFF
100%
M1
M2
M3
LEGEND
N/C — Normally Closed
N/O — Normally Open
JUMPER SETTINGS FOR 33CSENTSEN
2. At the enthalpy control remove the factory-installed
resistor from the (SR) and (+) terminals.
3. Connect the field-supplied RED wire to (+) spade
connector on the return air enthalpy sensor and the (SR+)
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.
Enthalpy Sensor Jumper Settings — There are two jumpers.
One jumper determines the mode of the enthalpy sensor. The
other jumper is not used. To access the jumpers, remove the
4 screws holding the cover on the enthalpy sensor and then remove the cover. The factory settings for the jumpers are M3
and OFF.
The mode jumper should be set to M3 for 4 to 20 mA
output. The factory test jumper should remain on OFF or the
enthalpy sensor will not calculate enthalpy.
ENTHALPY SENSORS AND CONTROL — The enthalpy
control (HH57AC077) is supplied as a field-installed accessory
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 accessory return air enthalpy sensor
(HH57AC078) is required for differential enthalpy control.
NOTE: The enthalpy control must be set to the “D” setting for
differential enthalpy control to work properly.
The enthalpy control receives the indoor and return
enthalpy from the outdoor and return air enthalpy sensors and
provides a dry contact switch input to the PremierLink™
controller. Locate the controller in place of an existing economizer 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/Enthalpy Controller
(HH57AC077) — To wire the outdoor air enthalpy sensor,
perform the following (see Fig. 30 and 31):
NOTE: The outdoor air sensor can be removed from the back
of the enthalpy controller and mounted remotely.
1. Use 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 harness
located in rooftop unit to the enthalpy controller:
a. Connect the BRN wire to the 24 vac terminal (TR1)
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 PremierLink controller and to terminal (3) on enthalpy
sensor.
d. Connect the GRAY/RED wire to J4-1 on PremierLink controller and to terminal (2) on enthalpy sensor.
NOTE: If installing in a Carrier rooftop, use the two gray wires
provided from the control section to the economizer to connect
PremierLink controller to terminals 2 and 3 on enthalpy sensor.
Return Air Enthalpy Sensor — Mount the return-air enthalpy
sensor (HH57AC078) in the return-air duct. The return air
sensor is wired to the enthalpy controller (HH57AC077). The
outdoor enthalpy changeover set point is set at the controller.
To wire the return air enthalpy sensor, perform the following (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.
ENTHALPY CONTROLLER
A
B
TR
C
D SO
TR1
SR
+
+
S (OUTDOOR
AIR
+ ENTHALPY
SENSOR)
RED
BRN
BLK
RED
S (RETURN AIR
+ ENTHALPY
SENSOR)
3
2
LED
1
GRAY/ORN
GRAY/RED
WIRE HARNESS
IN UNIT
NOTES:
1. Remove factory-installed jumper across SR and + before connecting 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 outside 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)
C7400
A1004
+
MOUNTING PLATE
Fig. 31 — Differential Enthalpy Control,
Sensor and Mounting Plate (33AMKITENT006)
22
3. Reinstall economizer hood.
4. Install all EconoMi$erIV accessories. EconoMi$erIV
wiring is shown in Fig. 35. EconoMi$er2 wiring is shown
in Fig. 36.
Outdoor air leakage is shown in Table 9. Return air pressure
drop is shown in Table 10.
OPTIONAL ECONOMI$ERIV AND ECONOMI$ER2 —
See Fig. 32 and 33 for EconoMi$erIV component locations.
See Fig. 34 for EconoMi$er2 component locations.
NOTE: These instructions are for installing the optional
EconoMi$erIV and EconoMi$er2 only. Refer to the accessory
EconoMi$erIV or EconoMi$er2 installation instructions when
field installing an EconoMi$erIV or EconoMi$er2 accessory.
To complete installation of the optional EconoMi$erIV, perform the following procedure.
1. Remove the EconoMi$erIV hood. Refer to Step 11 — Install Outdoor-Air Hood on page 14 for information on
removing and installing the outdoor-air hood.
2. Relocate outdoor air temperature sensor from shipping
position to operation position on EconoMi$erIV. See
Fig. 32.
Table 9 — Outdoor Air Damper Leakage
LEAKAGE (cfm)
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
IMPORTANT: Failure to relocate the sensor will result in
the EconoMi$erIV not operating properly.
SCREWS ECONOMI$ERIV
DAMPER STATIC PRESSURE (in. wg)
0.2
0.4
0.6
0.8
1.0
1.2
35
53
65
75
90
102
OUTDOOR AIR
TEMPERATURE SENSOR
FRAME
(INSTALLED OPERATION
SCREWS
TOP
POSITION)
FRAME
TOP
ECONOMI$ER2
SCREWS
SCREWS
LOW TEMPERATURE
COMPRESSOR
LOCKOUT SWITCH
Fig. 32 — EconoMi$erIV Component Locations —
End View
Fig. 34 — EconoMi$er2 Component Locations
SUPPLY AIR
TEMPERATURE SENSOR
LOCATION
ECONOMI$ERIV
ACTUATOR
TR1
TR
24
24
Vac
HOT
EXH
Set
Vac
COM
_
+
2
10V
N1
CONTROLLER
2V
1
N
4
n
P
T1
5
Min
Pos
EXH
P1
Ope
3
DCV
Max
T
EF1
10V
EF
2V
DCV
Set
DCV
10V
AQ1
AQ
2V
SO+
C
Free l
Coo B
SO
SR+
SR
D
A
FLANGE
AND SCREWS
(HIDDEN)
Fig. 33 — EconoMi$erIV Component Locations —
Side View
23
LEGEND
DCV — Demand Controlled Ventilation
IAQ — Indoor Air Quality
LALS — Low Temperature Compressor
Lockout Switch
OAT — Outdoor-Air Temperature
POT — Potentiometer
Potentiometer Default Settings:
Power Exhaust Middle
Minimum Pos.
Fully Closed
DCV Max.
Middle
DCV Set
Middle
Enthalpy
C Setting
NOTES:
1. 620 ohm, 1 watt 5% resistor should be removed only when using differential
enthalpy or dry bulb.
2. If a separate field-supplied 24 v transformer is used for the IAQ sensor power
supply, it cannot have the secondary of the transformer grounded.
3. For field-installed remote minimum position POT, remove black wire jumper
between P and P1 and set control minimum position POT to the minimum
position.
Fig. 35 — EconoMi$erIV Wiring
4
3
7
RED
500 OHM
RESISTOR
2
8
PINK
6
NOTE 1
BLUE
RUN
5
OAT
BLACK
NOTE 2
1
10
50HJ540573
ACTUATOR
ASSEMBLY
11
9
WHITE
DIRECT DRIVE
ACTUATOR
12
ECONOMISER2 PLUG
LEGEND
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 — EconoMi$er2 Wiring
24
Table 12 — EconoMi$erIV Sensor Usage
APPLICATION
Outdoor Air
Dry Bulb
Differential Dry Bulb
Single Enthalpy
Differential Enthalpy
CO2 for DCV Control
using a Wall-Mounted
CO2 Sensor
CO2 for DCV Control
using a Duct-Mounted
CO2 Sensor
33ZCSENCO2
33ZCSENCO2†
and
33ZCASPCO2**
CRCBDIOX005A00††
*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.
†33ZCSENCO2 is an accessory CO2 sensor.
**33ZCASPCO2 is an accessory aspirator box required for ductmounted applications.
††CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2
and 33ZCASPCO2 accessories.
Table 11 — Supply Air Sensor Temperature/
Resistance Values
TEMPERATURE (F)
–58
–40
–22
–4
14
32
50
68
77
86
104
122
140
158
176
185
194
212
230
248
257
266
284
302
ECONOMI$ERIV WITH OUTDOOR AIR
DRY BULB SENSOR
Accessories Required
None. The outdoor air dry bulb sensor
is factory installed.
CRTEMPSN002A00*
HH57AC078
HH57AC078
and
CRENTDIF004A00*
OR
ECONOMI$ERIV 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$erIV can
be used for free cooling. The sensor must be field-relocated.
See Fig. 32. The operating range of temperature measurement
is 40 to 100 F.
Supply Air Temperature (SAT) Sensor — The supply air
temperature sensor is a 3 K thermistor located at the inlet of the
indoor fan. See Fig. 33. This sensor is factory installed. The operating range of temperature measurement is 0° to 158 F. See
Table 11 for sensor temperature/resistance values.
The temperature sensor looks like an eyelet terminal with
wires running to it. The sensor is located in the “crimp end”
and is sealed from moisture.
Low Temperature Compressor Lockout Switch — The
EconoMi$erIV is equipped with an ambient temperature lockout switch located in the outdoor airstream which is used to
lockout the compressors below a 42 F ambient temperature.
See Fig. 32.
Outdoor Dry Bulb Changeover — The standard controller is
shipped from the factory configured for outdoor dry bulb
changeover control. The outdoor air and supply air temperature
sensors are included as standard. For this control mode, the
outdoor temperature is compared to an adjustable set point selected on the control. If the outdoor-air temperature is above
the set point, the EconoMi$erIV will adjust the outdoor-air
dampers to minimum position. If the outdoor-air temperature is
below the set point, the position of the outdoor-air dampers will
be controlled to provide free cooling using outdoor air. When
in this mode, the LED next to the free cooling set point potentiometer will be on. The changeover temperature set point is
controlled by the free cooling set point potentiometer located
on the control. See Fig. 37. The scale on the potentiometer is A,
B, C, and D. See Fig. 38 for the corresponding temperature
changeover values.
Differential Dry Bulb Control — For differential dry bulb
control the standard outdoor dry bulb sensor is used in conjunction with an additional accessory return air sensor (part number
CRTEMPSN002A00). The accessory sensor must be mounted
in the return airstream. See Fig. 39.
In this mode of operation, the outdoor-air temperature is
compared to the return-air temperature and the lower temperature airstream is used for cooling. When using this mode of
changeover control, turn the free cooling/enthalpy set point
potentiometer fully clockwise to the D setting. See Fig. 37.
RESISTANCE (ohms)
200,250
100,680
53,010
29,091
16,590
9,795
5,970
3,747
3,000
2,416
1,597
1,080
746
525
376
321
274
203
153
116
102
89
70
55
ECONOMI$ERIV CONTROL MODES
IMPORTANT: The optional EconoMi$er2 does not include
a controller. The EconoMi$er2 is operated by a 4 to 20 mA
signal from an existing field-supplied controller (such as
PremierLink™ control). See Fig. 36 for wiring information.
Determine the EconoMi$erIV control mode before set up of
the control. Some modes of operation may require different sensors. Refer to Table 12. The EconoMi$erIV is supplied from the
factory with a supply air temperature sensor, a low temperature
compressor lockout switch, and an outdoor air temperature
sensor. This allows for operation of the EconoMi$erIV with
outdoor air dry bulb changeover control. Additional accessories can be added to allow for different types of changeover
control and operation of the EconoMi$erIV and unit.
Fig. 37 — EconoMi$erIV Controller Potentiometer
and LED Locations
25
19
LED ON
18
D
17
LED OFF
16
mA
15
14
LED ON
C
LED OFF
13
12
LED ON
B
LED OFF
LED ON
A
11
10
1
TR
TR
LED OFF
c
Va
24 M
CO
EX
24
c
Va T
HO
H
Se
t
_
+
10V
9
N1
N
EX
40
45
50
55
60
65 70 75 80
DEGREES FAHRENHEIT
85
90
95
P1
100
2
2V
1
H
P
T1
5
Min s
Po
Op
4
en
DC
V
Ma
T
3
x
10V
DC
AQ
DC
V
1
1
EF
EF
2V
V
Se
t
10V
AQ
SO
2V
+
e
Fre ol
Co B
SO
+
SR
SR
C
D
A
Fig. 38 — Outside Air Temperature
Changeover Set Points
Outdoor Enthalpy Changeover — For enthalpy control, accessory enthalpy sensor (part number HH57AC078) is
required. Replace the standard outdoor dry bulb temperature
sensor with the accessory enthalpy sensor in the same mounting location. See Fig. 32. When the outdoor air enthalpy rises
above the outdoor enthalpy changeover set point, the outdoorair damper moves to its minimum position. The outdoor
enthalpy changeover set point is set with the outdoor enthalpy
set point potentiometer on the EconoMi$erIV controller. The
set points are A, B, C, and D. See Fig. 40. The factory-installed
620-ohm jumper must be in place across terminals SR and SR+
on the EconoMi$erIV controller. See Fig. 32 and 41.
Differential Enthalpy Control — For differential enthalpy
control, the EconoMi$erIV controller uses two enthalpy sensors (HH57AC078 and CRENTDIF004A00), one in the outside air and one in the return airstream or the EconoMi$erIV
frame. The EconoMi$erIV controller compares the outdoor air
enthalpy to the return air enthalpy to determine EconoMi$erIV
use. The controller selects the lower enthalpy air (return or outdoor) for cooling. For example, when the outdoor air has a lower enthalpy than the return air and is below the set point, the
EconoMi$erIV opens to bring in outdoor air for free cooling.
Replace the standard outside air dry bulb temperature sensor with the accessory 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$erIV controller. When using
this mode of changeover control, turn the enthalpy set point
potentiometer fully clockwise to the D setting.
NOTE: Remove 620-ohm resistor if differential enthalpy sensor is installed.
Indoor Air Quality (IAQ) Sensor Input — The IAQ input
can be used for demand control ventilation control based on the
level of CO2 measured in the space or return air duct.
Mount the accessory IAQ sensor according to manufacturer
specifications. The IAQ sensor should be wired to the AQ and
AQ1 terminals of the controller. Adjust the DCV potentiometers to correspond to the DCV voltage output of the indoor air
quality sensor at the user-determined set point. See Fig. 42.
If a separate field-supplied transformer is used to power the
IAQ sensor, the sensor must not be grounded or the
EconoMi$erIV control board will be damaged.
Exhaust Set Point Adjustment — The exhaust set point will
determine when the exhaust fan runs based on damper position
(if accessory power exhaust is installed). The set point is modified with the Exhaust Fan Set Point (EXH SET) potentiometer.
See Fig. 37. The set point represents the damper position above
which the exhaust fan will be turned on. When there is a
call for exhaust, the EconoMi$erIV controller provides a
IAQ
SENSOR
RETURN AIR
TEMPERATURE
OR ENTHALPY
SENSOR
Fig. 39 — Return Air Temperature or
Enthalpy Sensor Mounting Location
45 ± 15 second delay before exhaust fan activation to allow the
dampers to open. This delay allows the damper to reach the
appropriate position to avoid unnecessary fan overload.
Minimum Position Control — There is a minimum damper
position potentiometer on the EconoMi$erIV controller. See
Fig. 37. The minimum damper position maintains the minimum airflow into the building during the occupied period.
When using demand ventilation, the minimum damper position represents the minimum ventilation position for VOC
(volatile organic compound) ventilation requirements. The
maximum demand ventilation position is used for fully occupied ventilation.
When demand ventilation control is not being used, the
minimum position potentiometer should be used to set the occupied ventilation position. The maximum demand ventilation
position should be turned fully clockwise.
Adjust the minimum position potentiometer to allow 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
return-air temperatures.
To determine the minimum position setting, perform the
following procedure:
1. Calculate the appropriate mixed-air temperature using the
following formula:
OA
RA
(TO x
) + (TR x
) = TM
100
100
TO = Outdoor-Air Temperature
OA = Percent of Outdoor Air
TR = Return-Air Temperature
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 return-air temperature is 75 F.
(60 x .10) + (75 x .90) = 73.5 F
26
46
85
90
95 100 105 110
(29) (32) (35) (38) (41) (43)
44
CONTROL CONTROL POINT
CURVE
APPROX. °F (°C)
AT 50% RH
73 (23)
A
70 (21)
B
67 (19)
C
63 (17)
D
36
75
(24)
EH
RE
30
U
70
(21)
16
18
55
(13) B
12
14
50
(10)
40
(4)
45
(7)
70
50
A
30
20
60
(16)
40
22
60
24
65
(18)
80
10
0
90
8
EN
TH
AL
26 PY
—
2 BT
LA
TIV
32
PE
R
34
PO
UN
D
UM
ID
DR
Y
IT Y
38
AI
R
(%
)
40
42
80
(27)
C
20
D
10
35
(2)
B A
D C
35
(2)
40
(4)
45
(7)
HIGH LIMIT
CURVE
55
60
65
70
75
80
85
90
95 100 105 110
(13) (16) (18) (21) (24) (27) (29) (32) (35) (38) (41) (43)
50
(10)
APPROXIMATE DRY BULB TEMPERATURE— °F (°C)
Fig. 40 — Enthalpy Changeover Set Points
EXH
N1
2V
EXH
P1
P
Min
Pos
T1
DCV
2V
SO+
SO
SR
CO2 SENSOR MAX RANGE SETTING
24
Vac
HOT
6000
24 Vac
COM
+
_
1
2
Max
10V
5
DCV
AQ
SR+
TR1
Open
T
AQ1
TR
Set
10V
RANGE CONFIGURATION (ppm)
N
2V
DCV
Set
10V
Free
Cool
B
C
A
D
3
4
EF
EF1
5000
4000
800 ppm
900 ppm
1000 ppm
1100 ppm
3000
2000
1000
0
2
3
4
5
6
7
8
DAMPER VOLTAGE FOR MAX VENTILATION RATE
Fig. 41 — EconoMi$erIV Controller
Fig. 42 — CO2 Sensor Maximum Range Setting
27
2. Disconnect the supply-air sensor from terminals T and
T1.
3. Ensure that the factory-installed jumper is in place across
terminals P and P1. If remote damper positioning is being
used, make sure that the terminals are wired according to
Fig. 35 and that the minimum position potentiometer is
turned fully clockwise.
4. Connect 24 vac across terminals TR and TR1.
5. Carefully adjust the minimum position potentiometer
until the measured mixed-air temperature matches the
calculated value.
6. Reconnect the supply-air sensor to terminals T and T1.
Remote control of the EconoMi$erIV damper is desirable
when requiring additional temporary ventilation. If a
field-supplied remote potentiometer (Honeywell part number
S963B1128) is wired to the EconoMi$erIV controller, the minimum position of the damper can be controlled from a remote
location.
To control the minimum damper position remotely, remove
the factory-installed jumper on the P and P1 terminals on the
EconoMi$erIV controller. Wire the field-supplied potentiometer to the P and P1 terminals on the EconoMi$erIV controller.
See Fig. 41.
Damper Movement — Damper movement from full open to
full closed (or vice versa) takes 21/2 minutes.
Thermostats — The EconoMi$erIV control works with conventional 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$erIV control does not support space temperature
sensors. Connections are made at the thermostat terminal connection board located in the main control box.
Occupancy Control — The factory default configuration for
the EconoMi$erIV 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 terminals 9 and 10 on TB2. See Fig. 35. When the timeclock
contacts are closed, the EconoMi$erIV control will be in
occupied mode. When the timeclock contacts are open (removing the 24-v signal from terminal N), the EconoMi$erIV will
be in unoccupied mode.
Demand Controlled Ventilation (DCV) — When using the
EconoMi$erIV for demand controlled ventilation, there are
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 calculated to provide the desired fresh air.
Typically the maximum ventilation rate will be about 5 to
10% more than the typical cfm required per person, using
normal outside air design criteria.
A proportional anticipatory strategy should be taken with
the following conditions: a zone with a large area, varied occupancy, and equipment that cannot exceed the required ventilation rate at design conditions. Exceeding the required ventilation rate means the equipment can condition air at a maximum
ventilation rate that is greater than the required ventilation rate
for maximum occupancy. A proportional-anticipatory strategy
will cause the 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 maintain
the set point.
In order to have the CO2 sensor control the economizer
damper in this manner, first determine the damper voltage output for minimum or base ventilation. Base ventilation is the
ventilation required to remove contaminants during unoccupied 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.
(TO x
OA
RA
) + (TR x
) = TM
100
100
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 minimum damper position potentiometer to the correct position.
The same equation can be used to determine the occupied or
maximum ventilation rate to the building. For example, an output of 3.6 volts to the actuator provides a base ventilation rate
of 5% and an output of 6.7 volts provides the maximum ventilation rate of 20% (or base plus 15 cfm per person). Use Fig. 42
to determine the maximum setting of the CO2 sensor. For example, a 1100 ppm set point relates to a 15 cfm per person design. 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
CO2 sensor to the actuator when the CO2 concentration in the
space is at 1100 ppm. The 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 damper position has been determined, set the maximum damper demand control ventilation
potentiometer to this position. Do not set to the maximum position as this can result in over-ventilation to the space and potential high-humidity levels.
CO 2 Sensor Configuration — The CO2 sensor has preset
standard voltage settings that 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. The STDSET Menu will appear.
3. Use the Up/Down button to select the preset number. See
Table 13.
4. Press Enter to lock in the selection.
5. Press Mode to exit and resume normal operation.
The custom settings of the CO2 sensor can be changed anytime after the sensor is energized. Follow the steps below to
change the 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. The 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 the desired setting 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 variable.
28
Table 13 — CO2 Sensor Standard Settings
OUTPUT
VENTILATION
RATE
(cfm/Person)
Proportional
Any
Proportional
Any
3
Exponential
Any
4
Proportional
15
Proportional
20
6
Exponential
15
7
Exponential
20
SETTING
EQUIPMENT
1
2
Interface with Standard
Building Control System
5
Economizer
8
Health & Safety
Proportional
—
9
Parking/Air Intakes/
Loading Docks
Proportional
—
ANALOG
OUTPUT
0-10V
4-20 mA
2-10V
7-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
CO2
CONTROL RANGE
(ppm)
OPTIONAL
RELAY SETPOINT
(ppm)
RELAY
HYSTERESIS
(ppm)
0-2000
1000
50
0-2000
1000
50
0-2000
1100
50
0-1100
1100
50
0- 900
900
50
0-1100
1100
50
0- 900
900
50
0-9999
5000
500
0-2000
700
50
LEGEND
ppm — Parts Per Million
Step 14 — Install Humidistat for Optional
MoistureMi$er™ Package — MoistureMi$er dehu-
Dehumidification of Fresh Air with DCV Control — Information from ASHRAE indicates that the largest humidity load
on any zone is the fresh air introduced. For some applications,
a field-installed energy recovery unit can be added to reduce
the moisture content of the fresh air being brought into the
building when the enthalpy is high. In most cases, the normal
heating and cooling processes are more than adequate to remove the humidity loads for most commercial applications.
If normal rooftop heating and cooling operation is not adequate for the outdoor humidity level, an energy recovery unit
and/or a dehumidification option should be considered.
midification package operation can be controlled by field installation of a Carrier-approved humidistat. To install the humidistat perform the following procedure:
1. Locate humidistat on a solid interior wall in the conditioned space. Location should be a well ventilated area
to sense average humidity.
2. Route thermostat cable or equivalent single leads of colored wire from Humidistat terminals through conduit in
unit to the low voltage connection on the 2-pole terminal
strip (TB3) as shown in Fig. 43 and Fig. 44. See Fig. 45
for operational diagram.
29
MOISTUREMI$ER
YEL
YEL
TO CRANKCASE
HEATER CIRCUITS
BLK
BLK
BLK
ORN
RED BLK
ORN
YEL
TRAN1
A
24V
A
C
GRN-YEL
—
—
—
—
—
YEL
TRAN3
24V
CB
LLSV
LPS
TB
TRAN
RED BLK
BLK
C
GRN-YEL
LEGEND
Circuit Breaker
Liquid Line Solenoid Valve
Low-Pressure Switch
Terminal Block
Transformer
BLK
S-LPS1
TB3
CB4
11
21
3.2 AMPS
LLSV1
1
2
BLK
S-LPS2
FACTORY INSTALLED JUMPER
(OR HUMIDISTAT IF USED)
Fig. 43 — Typical MoistureMi$er™ Dehumidification Package
Humidistat Wiring Schematic (460 V Unit Shown)
Fig. 44 — Typical MoistureMi$er Dehumidification
Package Control Box
30
LLSV2
TXV
— Thermostatic Expansion Valve
Fig. 45 — MoistureMi$er™ Dehumidification Package Operation Diagram
START-UP
2. Turn off power to the unit.
3. Reverse any two of the incoming power leads.
4. Turn on power to the unit.
5. Energize each compressor.
The suction and discharge pressure levels should now move
to their normal start-up levels.
NOTE: When compressors are rotating in the wrong direction,
the unit will have increased noise levels and will not provide
heating and cooling.
After a few minutes of reverse operation, the scroll compressor internal overload protection will open, which will activate the unit’s lockout and requires a manual reset. Reset is
accomplished by turning the thermostat on and off.
INTERNAL WIRING — Check all electrical connections in
unit control boxes; tighten as required.
CRANKCASE HEATER (SIZE 028 AND UNITS WITH
MOISTUREMI$ER™ DEHUMIDIFICATION PACKAGE
ONLY) — Crankcase heater(s) is energized as long as there is
power to the unit and the compressor is not operating.
Use the following information and Start-Up Checklist on
page CL-1 to check out unit PRIOR to start-up.
Unit Preparation — Check that unit has been installed in
accordance with these installation instructions and all applicable codes.
COMPRESSOR MOUNTING — Do not loosen or remove
compressor holddown bolts.
REFRIGERANT SERVICE PORTS — Each refrigerant system has a total of 3 Schrader-type service gage ports. One port
is located on the suction line, one on the compressor discharge
line, and one on the liquid line. In addition Schrader-type
valves are located underneath the low-pressure switches. Be
sure that caps on the ports are tight.
COMPRESSOR ROTATION
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 run if field power is connected incorrectly. To determine if the Phase Monitor Relay is
preventing the unit from starting, check to see if the red LED is
blinking. If the 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 compressors 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 pressure should rise, as is normal on any start-up.
If the suction pressure does not drop and the discharge pressure does not rise to normal levels:
1. Note that the evaporator fan is probably also rotating
in the wrong direction.
IMPORTANT: Unit power must be on for 24 hours prior to
start-up. Otherwise, damage to the compressor may result.
EVAPORATOR FAN — Fan belt and variable pulleys are
factory-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 accessories and
options. See Table 24 for fan rpm at motor pulley settings. See
Tables 25 and 26 for evaporator-fan motor data and evaporatorfan motor efficiency. To alter fan performance, see Evaporator
Fan Performance Adjustment section on page 40.
NOTE: A 31/2-in. bolt and threaded plate are included in the
installer’s packet for 48TJ020-028 units. They can be added to
the motor support channel below the motor mounting plate to
aid in raising the fan motor.
31
Table 14 — Fan Performance — 48TJD016 (Low Heat Units)
AIRFLOW
(cfm)
4500
4800
5100
5400
5700
6000
6300
6600
6900
7200
7500
Rpm
809
850
892
934
976
1019
1063
1106
1150
—
—
0.2
Bhp
1.53
1.76
2.01
2.28
2.58
2.90
3.24
3.61
4.00
—
—
Watts
1317
1516
1733
1970
2225
2500
2795
3111
3448
—
—
Rpm
906
942
979
1017
1058
1096
1136
1177
1218
—
—
0.4
Bhp
1.74
1.98
2.24
2.52
2.82
3.14
3.49
3.86
4.26
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Watts
Rpm Bhp Watts Rpm Bhp Watts Rpm
1502
994 1.96
1690
1078 2.18
1882
1156
1706
1027 2.20
1899
1107 2.43
2094
1183
1928
1061 2.46
2125
1138 2.70
2325
1211
2169
1096 2.75
2371
1170 2.99
2575
1241
2429
1132 3.06
2635
1204 3.30
2843
1272
2709
1168 3.38
2919
1238 3.63
3131
1304
3008
1206 3.74
3223
1273 3.99
3439
1337
3329
1244 4.11
3547
1309 4.37
3767
—
3670
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1.0
Bhp
2.41
2.66
2.93
3.22
3.54
3.88
4.24
—
—
—
—
Watts
2077
2293
2528
2781
3053
3345
3657
—
—
—
—
Rpm
1230
1255
1281
1309
1338
1368
—
—
—
—
—
1.2
Bhp
2.64
2.89
3.17
3.47
3.79
4.13
—
—
—
—
—
Watts
2275
2495
2733
2990
3266
3562
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.6
1.8
1.9
2.0
Rpm
Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts
4500
1301
2477
1369 3.11
2683
1434 3.35
2891
1497 3.47
2997
1497 3.60
3103
4800
1324
2700
1390 3.37
2909
1454 3.62
3120
1515 3.74
3226
1515 3.87
3334
5100
1349
2942
1413 3.66
3153
1475 3.90
3367
1535 4.03
3475
1535 4.16
3584
5400
1374
3202
1437 3.96
3416
1498 4.21
3633
—
—
—
—
—
—
5700
1402
3481
1463 4.29
3699
—
—
—
—
—
—
—
—
—
6000
—
—
—
—
—
—
—
—
—
—
—
—
—
—
6300
—
—
—
—
—
—
—
—
—
—
—
—
—
—
6600
—
—
—
—
—
—
—
—
—
—
—
—
—
—
6900
—
—
—
—
—
—
—
—
—
—
—
—
—
—
7200
—
—
—
—
—
—
—
—
—
—
—
—
—
—
7500
—
—
—
—
—
—
—
—
—
—
—
—
—
—
3. Static pressure losses (i.e., economizer) must be added to external static
LEGEND
pressure before entering Fan Performance table.
Bhp — Brake Horsepower
4. Interpolation is permissible. Do not extrapolate.
FIOP — Factory-Installed Option
5.
Fan performance is based on wet coils, clean filters, and casing losses.
Watts — Input Watts to Motor
See Tables 21-23 for accessory/FIOP static pressure information.
NOTES:
6. Extensive motor and drive testing on these units ensures that the full
1. Standard low-medium static drive range is 891 to 1179 rpm (for 208/230
horsepower and watts range of the motor can be utilized with confiand 460-v units) or 1159 to 1429 rpm (for 575-v units). Alternate highdence. Using fan motors up to the watts or bhp rating shown will not
static drive range is 1227 to 1550 (for 208/230 and 460-v units). The
result in nuisance tripping or premature motor failure. Unit warranty will
alternate high-static drive is not available for 48TJ016 575-v units. Other
not be affected.
rpms require a field-supplied drive.
7. Use of a field-supplied motor may affect wiring size. Contact your Carrier
2. Maximum continuous bhp is 4.25 (208/230 and 460 v) or 3.45 (575 v)
representative for details.
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.
AIRFLOW
(cfm)
1.4
Bhp
2.87
3.13
3.41
3.71
4.04
—
—
—
—
—
—
Table 15 — Fan Performance — 48TJD020 and 024 (Low Heat Units)
AIRFLOW
(cfm)
5,500
6,000
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000
Rpm
755
810
866
923
980
1038
1096
1154
1213
1272
0.2
Bhp
2.27
2.72
3.22
3.78
4.39
5.06
5.78
6.56
7.40
8.30
Rpm
1149
1183
1219
1258
1299
1341
1385
1431
1478
—
1.4
Bhp
4.28
4.76
5.29
5.88
6.52
7.21
7.97
8.78
9.65
—
AIRFLOW
(cfm)
5,500
6,000
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000
Watts
1908
2287
2710
3177
3690
4251
4859
5517
6224
6983
Watts
3602
4003
4450
4942
5480
6065
6699
7382
8114
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Watts Rpm Bhp Watts Rpm Bhp Watts Rpm
2171
901 2.91
2443
968
3.24
2723
1031
2556
947 3.37
2833
1010 3.71
3116
1070
2985
994 3.88
3266
1054 4.23
3554
1111
3458
1044 4.45
3744
1100 4.80
4036
1155
3976
1094 5.07
4267
1148 5.43
4564
1200
4542
1146 5.75
4838
1197 6.11
5138
1246
5156
1198 6.49
5456
1247 6.85
5761
1294
5818
1251 7.28
6123
1298 7.65
6432
1343
6531
1306 8.13
6840
1350 8.51
7154
1394
7294
1360 9.05
7608
1403 9.43
7926
1445
Rpm
831
881
932
985
1038
1093
1148
1204
1260
1317
0.4
Bhp
2.58
3.04
3.55
4.11
4.73
5.40
6.13
6.92
7.77
8.67
Rpm
1204
1236
1270
1307
1346
1387
1429
1473
1519
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.6
1.8
1.9
Bhp
Watts Rpm Bhp Watts Rpm Bhp
4.65
3907
1258 5.02
4217
1284 5.20
5.13
4310
1288 5.50
4622
1313 5.68
5.66
1459
1320 6.03
5073
1344 6.22
6.25
5253
1355 6.62
5569
1378 6.81
6.89
5794
1392 7.27
6113
1415 7.46
7.59
6383
1392 7.97
6704
1453 8.16
8.35
7019
1472 8.73
7343
1493 8.93
9.15
7705
1515 9.55
8032
1535 9.75
10.04
8441
—
—
—
—
—
—
—
—
—
—
—
—
Watts
4375
4780
5232
5729
6273
6866
7506
8196
—
—
Rpm
1309
1337
1368
1402
1437
1475
1514
—
—
—
1.0
Bhp
3.58
4.05
4.57
5.15
5.78
6.47
7.22
8.02
8.88
9.81
Watts
3009
3406
3847
4333
4864
5443
6070
6745
7471
8247
2.0
Bhp
5.39
5.87
6.41
7.00
7.65
8.36
9.12
—
—
—
Watts
4533
4939
5391
5890
6435
7028
7670
—
—
—
Rpm
1091
1127
1166
1207
1250
1294
1340
1388
1436
1486
1.2
Bhp
3.93
4.40
4.93
5.51
6.15
6.84
7.59
8.40
9.26
10.19
Watts
3302
3702
4146
4635
5170
5752
6382
7062
7791
8570
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/FIOP 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 confidence. 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.
LEGEND
Bhp — Brake Horsepower
FIOP — 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
32
Table 16 — Fan Performance — 48TJD028 (Low Heat Units)
AIRFLOW
(cfm)
7,000
7,500
8,000
8,500
9,000
9,500
10,000
10,500
11,000
11,250
Rpm
941
999
1058
1117
1177
1237
1297
1358
1418
1449
Rpm
1274
1316
1360
1406
1453
1501
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.4
1.6
1.8
Bhp
Watts Rpm Bhp
Watts Rpm
Bhp
6.35
5248
1323
6.92
5718 1371
5.54
7.20
6960
1364
7.79
6437 1410
6.41
8.14
6734
1406
8.76
7239 1450
7.40
9.20
7605
1449
9.83
8129 1492
8.48
10.36
8568
1495 11.02
9111 1536
9.69
11.64
9627
1541 12.32 10190
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AIRFLOW
(cfm)
7,000
7,500
8,000
8,500
9,000
9,500
10,000
10,500
11,000
11,250
Watts
2769
3348
4007
4750
5583
6511
7450
8674
9919
10585
Rpm
1002
1057
1113
1169
1226
1284
1342
1400
1459
—
0.4
Bhp
3.80
4.53
5.35
6.28
7.31
8.46
9.74
11.14
12.67
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Watts Rpm
Bhp
Watts Rpm
Bhp
Watts Rpm
3140 1061
4.27
3528 1117
4.76
3934 1171
3742 1112
5.02
4152 1166
5.54
4579 1218
4424 1165
5.87
4856 1216
6.41
5304 1266
5190 1219
6.83
5645 1268
7.40
6114 1315
6047 1274
7.89
6524 1320
8.48
7015 1365
6999 1329
9.07
7499 1374
9.69
8012 1417
8051 1385 10.37
8574 1428 11.02
9110 1469
9209 1442 11.80
9755 1483 12.47 10314 1523
10478
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.2
Bhp
3.35
4.05
4.85
5.74
6.75
7.98
9.12
10.49
12.00
12.80
1.0
Bhp
5.27
6.07
6.97
7.98
9.09
10.33
11.68
13.16
—
—
Watts
4356
5020
5766
6597
7520
8538
9657
10883
—
—
Rpm
1224
1268
1314
1361
1410
1459
1510
—
—
—
1.2
Bhp
5.80
6.63
7.55
8.58
9.72
10.98
12.36
—
—
—
Watts
4794
5478
6243
7094
8037
9076
10217
—
—
—
Watts
6204
6939
7759
8666
9667
—
—
—
—
—
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/FIOP 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 confidence. 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.
LEGEND
Bhp — Brake Horsepower
FIOP — 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.
Table 17 — Fan Performance — 48TJF016 (High Heat Units)
AIRFLOW
(cfm)
4500
4800
5100
5400
5700
6000
6300
6600
6900
7200
Rpm
819
861
904
947
990
1034
1078
1123
1167
—
AIRFLOW
(cfm)
4500
4800
5100
5400
5700
6000
6300
6600
6900
7200
Rpm
1304
1327
1353
1380
1408
—
—
—
—
—
0.2
Bhp
1.55
1.78
2.04
2.32
2.62
2.94
3.29
3.67
4.06
—
1.4
Bhp
2.88
3.14
3.43
3.73
4.06
—
—
—
—
—
Watts
1335
1538
1759
1999
2259
2539
2840
3161
3504
—
Watts
2484
2711
2955
3219
3503
—
—
—
—
—
Rpm
914
951
989
1028
1068
1109
1150
1192
1234
—
Rpm
1371
1393
1417
1442
1468
—
—
—
—
—
0.4
Bhp
1.76
2.00
2.26
2.55
2.85
3.18
3.54
3.91
4.32
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Watts Rpm
Bhp
Watts Rpm
Bhp
Watts Rpm
1518
1001
1.98
1705 1083
2.20
1894 1160
1726
1035
2.22
1916 1113
2.45
2110 1188
1952
1069
2.49
2147 1145
2.72
2345 1218
2197
1105
2.78
2396 1179
3.01
2598 1248
2461
1142
3.09
2665 1213
3.33
2871 1280
2745
1180
3.42
2953 1248
3.67
3163 1313
3050
1218
3.78
3262 1284
4.03
3476 1348
3376
1258
4.16
3592
—
—
—
—
3723
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.6
1.8
1.9
Bhp Watts Rpm Bhp Watts
Rpm Bhp
3.12
2688
1435 3.36
2895
1467 3.48
3.38
2917
1456 3.62
3126
1486 3.75
3.67
3165
1478 3.92
3377
1508 4.04
3.98
3432
1502 4.23
3646
1531 4.35
4.31
3718
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Watts
2999
3232
3484
3755
—
—
—
—
—
—
Rpm
1497
1517
1537
—
—
—
—
—
—
—
1.0
Bhp
2.42
2.68
2.95
3.25
3.57
3.91
4.28
—
—
—
Watts
2088
2307
2545
2802
3079
3375
3692
—
—
—
2.0
Bhp
3.60
3.87
4.16
—
—
—
—
—
—
—
Watts
3104
3338
3592
—
—
—
—
—
—
—
Rpm
1234
1259
1287
1315
1345
1376
—
—
—
—
1.2
Bhp
2.65
2.91
3.17
3.49
3.81
4.16
—
—
—
—
Watts
2284
2507
2749
3009
3289
3589
—
—
—
—
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/FIOP 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 confidence. 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.
LEGEND
Bhp — Brake Horsepower
FIOP — 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
33
Table 18 — Fan Performance — 48TJF020 and 024 (High Heat Units)
AIRFLOW
(cfm)
5,500
6,000
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000
Rpm
795
854
914
975
1037
1099
1161
1223
1286
1349
AIRFLOW
(cfm)
5,500
6,000
6,500
7,000
7,500
8,000
8,500
9,000
9,500
10,000
Rpm
1173
1211
1252
1295
1340
1388
1436
1486
1538
—
0.2
Bhp
2.43
2.92
3.46
4.06
4.72
5.44
6.22
7.07
7.98
8.95
1.4
Bhp
4.44
4.95
5.53
6.16
6.85
7.60
8.41
9.28
10.22
—
Watts
2043
2452
2909
3414
3969
4575
5232
5943
6708
7528
Watts
3732
4165
4646
5176
5756
6388
7071
7807
8597
—
Rpm
866
921
977
1034
1092
1150
1210
1270
1331
1392
Rpm
1227
1263
1302
1343
1386
1431
1478
1527
—
—
0.4
Bhp
2.74
3.24
3.79
4.39
5.06
5.79
6.57
7.43
8.34
9.32
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Watts Rpm
Bhp
Watts Rpm
Bhp
Watts Rpm
2306
934
3.07
2578
998
3.40
2856 1059
2722
984
3.57
3998 1044
3.90
3281 1102
3184
1036
4.12
3465 1093
4.46
3752 1148
3695
1090
4.73
3981 1144
5.08
4272 1196
4255
1145
5.41
4546 1196
5.76
4842 1256
4866
1201
6.14
5162 1249
6.50
5462 1297
5529
1258
6.93
5829 1304
7.29
6134 1349
6245
1315
7.79
6550 1360
8.16
6869 1403
7014
1374
8.71
7324 1416
9.08
7638 1457
7839
1433
9.70
8154 1473 10.07
8471
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.6
1.8
1.9
Bhp Watts Rpm
Bhp Watts Rpm
Bhp
4.80
4036
1279
5.17
4345
1304
5.35
5.32
4471
1313
5.69
4782
1337
5.87
5.89
4954
1350
6.26
5267
1373
6.56
6.52
5487
1389
6.90
5802
1412
7.09
7.22
6070
1431
7.60
6387
1452
7.79
7.97
6704
1474
8.35
7024
1495
8.54
8.79
7390
1520
9.17
7713
1540
9.37
9.67
8130
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Watts
4502
4939
5425
5961
6547
7186
7876
—
—
—
Rpm
1329
1361
1396
1434
1474
1516
—
—
—
—
1.0
Bhp
3.74
4.25
4.81
5.43
6.12
6.86
7.66
8.53
9.46
—
2.0
Bhp
5.54
6.06
6.64
7.28
7.98
8.74
—
—
—
—
Watts
3142
3570
4045
4569
5142
5766
6443
7171
7954
—
Rpm
1117
1158
1201
1246
1294
1343
1393
1445
1498
—
1.2
Bhp
4.08
4.60
5.16
5.79
6.48
7.22
8.03
8.90
9.84
—
Watts
3434
3865
4343
4870
5447
6075
6755
7487
8274
—
Watts
4629
5097
5584
6121
6709
7348
—
—
—
—
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/FIOP 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 confidence. 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.
LEGEND
Bhp — Brake Horsepower
FIOP — 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
Table 19 — Fan Performance — 48TJF028 (High Heat Units)
AIRFLOW
(cfm)
7,000
7,500
8,000
8,500
9,000
9,500
10,000
10,500
11,000
11,250
Rpm
992
1055
1118
1182
1246
1310
1374
1439
1503
1536
Rpm
1311
1358
1406
1456
1507
—
—
—
—
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
1.4
1.6
1.8
Bhp
Watts Rpm Bhp
Watts Rpm
Bhp
6.51
5385
1359
6.96
5751
1405
6.00
7.30
6039
1403
7.76
6412
1448
6.84
8.17
6767
1560
8.63
7137
1492
7.75
9.12
7541
1498
9.59
7929
1539
8.75
10.15
8393
1548 10.63
8790
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
AIRFLOW
(cfm)
7,000
7,500
8,000
8,500
9,000
9,500
10,000
10,500
11,000
11,250
Watts
3,348
3,947
4,610
5,339
6,136
7,005
7,947
8,964
10,059
10,636
Rpm
1051
1110
1170
1231
1292
1354
1416
1479
1542
—
0.4
Bhp
4.44
5.17
5.99
6.88
7.86
8.92
10.07
11.32
12.65
—
AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)
0.6
0.8
Watts Rpm
Bhp
Watts Rpm
Bhp
Watts Rpm
3,668 1106
4.83
3995 1160
5.24
4331
1212
4,277 1162
5.58
4615 1214
6.00
4960
1263
4,950 1220
6.41
5298 1268
6.84
5653
1315
5,690 1278
7.31
6047 1324
7.75
6411
1369
6,498 1337
8.30
6865 1381
8.75
7239
1424
7,377 1397
9.38
7754 1439
9.84
8137
1480
8,329 1457 10.54
8715 1497 11.02
9107
1537
9,356 1518 11.79
9752
—
—
—
—
10,460
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.2
Bhp
4.05
4.77
5.58
6.46
7.42
8.47
9.61
10.84
12.17
12.86
1.0
Bhp
5.65
6.43
7.27
8.20
9.21
10.31
11.50
—
—
—
Watts
4675
5312
6014
6782
7618
8525
9504
—
—
—
Rpm
1262
1311
1361
1413
1466
1520
—
—
—
—
1.2
Bhp
6.08
6.86
7.72
8.66
9.68
10.79
—
—
—
—
Watts
5026
5672
6382
7158
8003
8918
—
—
—
—
Watts
6124
6792
7524
8323
—
—
—
—
—
—
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/FIOP 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 confidence. 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.
LEGEND
Bhp — Brake Horsepower
FIOP — 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.
34
Table 20 — Air Quantity Limits
UNIT
48TJ
MINIMUM
COOLING
CFM
016
020
024
028
4500
5400
6000
7000
MINIMUM
HEATING CFM
Low Heat
High Heat
3800
3800
4750
5450
4750
5450
4750
5450
MAXIMUM
CFM
7,500
9,000
10,000
11,250
Table 21 — Accessory/FIOP Static Pressure*
(in. wg) — 48TJ016
COMPONENT
4500
0.04
Economizer
CFM
6000
0.07
5000
0.05
7200
0.09
7500
0.10
LEGEND
FIOP — 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 Performance tables to determine blower rpm and watts.
Table 22 — Accessory/FIOP Static Pressure*
(in. wg) — 48TJ020-028
COMPONENT
Economizer
5000
0.06
6000
0.07
7200
0.09
CFM
9000
0.11
10,000
0.12
11,250
0.14
LEGEND
FIOP — 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 Performance tables to determine blower rpm and watts.
Table 23 — MoistureMi$er™ Dehumidification
Package Static Pressure Drop (in. wg)
UNIT NOMINAL
TONS
15
18
20
25
UNIT SIZE
48TJ016
48TJ020
48TJ024
48TJ028
300
.040
.058
.071
.111
CFM PER TON
400
.071
.102
.126
.197
500
.111
.160
.197
.308
Table 24 — Fan Rpm at Motor Pulley Settings*
UNIT
48TJ
016 (208/230, 460 v)†
016 (208/230, 460 v)**
016 (575 v)†
020†
020**
024†
024**
028†
028**
0
††
††
††
††
††
††
††
††
††
1/2
††
††
††
††
††
††
††
††
††
1
1179
1559
1429
1095
1287
1225
1458
1283
††
11/2
1150
1522
1403
1077
1265
1209
1434
1269
††
2
1121
1488
1376
1058
1243
1187
1407
1247
1551
MOTOR PULLEY TURNS OPEN
21/2
3
31/2
4
1093
1064
1035
1006
1455
1422
1389
1356
1349
1323
1296
1269
1040
1021
1002
984
1222
1200
1178
1156
1165
1143
1120
1098
1381
1354
1328
1301
1225
1203
1182
1160
1524
1497
1470
1443
*Approximate fan rpm shown.
†Indicates standard drive package.
**Indicates alternate drive package.
††Due to belt and pulley size, pulley cannot be set to this number of
turns open.
41/2
978
1323
1242
965
1134
1076
1275
1138
1415
5
949
1289
1215
947
1112
1053
1248
1116
1388
51/2
920
1256
1188
928
1091
1031
1222
1095
1361
6
891
1227
1159
910
1069
1002
1193
1066
1332
NOTE: For speeds not listed above, field-supplied drives are
required.
35
Table 25 — Evaporator-Fan Motor Data
UNIT
48TJ
UNIT
VOLTAGE
016
020
024
028
208/230
460
575
208/230
460
575
208/230
460
575
208/230
460
575
MAXIMUM
ACCEPTABLE
CONTINUOUS BHP*
4.25
4.25
3.45
MAXIMUM
ACCEPTABLE
CONTINUOUS BkW*
3.17
3.17
2.59
MAXIMUM
ACCEPTABLE
OPERATING WATTS
3,775
3,775
3,065
5.90
4.40
5,180
8.70
9.50
8.70
10.20
11.80
10.20
6.49
7.08
6.49
7.61
8.80
7.61
7,915
8,640
7,915
9,510
11,000
9,510
MAXIMUM
AMP DRAW
10.5
4.8
3.9
15.8
7.9
6.0
22.0
13.0
10.0
28.0
14.6
13.0
LEGEND
BHP — Brake Horsepower
BkW — Brake Kilowatts
*Extensive motor and electrical testing on these units ensures that the full horsepower (brake kilowatt)
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.
Operating Sequence
Table 26 — Evaporator-Fan Motor Efficiency
UNIT 48TJ
016 (3.0 Hp)
016 (3.7 Hp)
020 (5 Hp)
024 (7.5 Hp)
028 (10 Hp)
COOLING, UNITS WITHOUT ECONOMIZER — When
thermostat calls for cooling, terminals G and Y1 are energized.
The indoor (evaporator) fan contactor (IFC), compressor contactor no. 1 (C1) and outdoor-fan contactor (OFC) are energized, and evaporator-fan motor, compressor no. 1, and both
condenser fans start. The condenser-fan motors run continuously while unit is cooling. If the thermostat calls for a second stage
of cooling by energizing Y2, compressor contactor no. 2 (C2) is
energized and compressor no. 2 starts.
When the thermostat is satisfied, C1 and C2 are deenergized and the compressors and outdoor (condenser) fan motors
(OFM) shut off. After a 30-second delay, the indoor (evaporator) fan motor (IFM) shuts off. If the thermostat fan selector
switch is in the ON position, the evaporator-fan motor will run
continuously.
HEATING, UNITS WITHOUT ECONOMIZER — When
the thermostat calls for heating, terminal W1 is energized. In
order to prevent thermostat short-cycling, the unit is locked
into the Heating mode for at least 1 minute when W1 is energized. The induced-draft motor (IDM) is then energized and
the burner ignition sequence begins. The indoor (evaporator)
fan motor (IFM) is energized 45 seconds after a flame is
ignited. On units equipped for two stages of heat, when additional heat is needed, W2 is energized and the high-fire solenoid on the main gas valve (MGV) is energized. When the
thermostat is satisfied and W1 and W2 are deenergized, the
IFM stops after a 45-second time-off delay.
COOLING, UNITS WITH ECONOMI$ERIV — When free
cooling is not available, the compressors will be controlled by
the zone thermostat. When free cooling is available, the
outdoor-air damper is modulated by the EconoMi$erIV control
to provide a 50 to 55 F supply-air temperature into the zone. As
the supply-air temperature fluctuates above 55 or below 50 F,
the dampers will be modulated (open or close) to bring the
supply-air temperature back within the set point limits.
For EconoMi$erIV operation, there must be a thermostat
call for the fan (G). This will move the damper to its minimum
position during the occupied mode.
MOTOR EFFICIENCY (%)
81.7
85.8
87.5
88.5
89.5
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.
CONDENSER-FANS AND MOTORS — Condenser fans
and motors are factory set. Refer to Condenser-Fan Adjustment
section (page 42) as required. Be sure that fans rotate in the
proper direction.
RETURN-AIR FILTERS — Check that correct filters are
installed in filter tracks (see Table 1). Do not operate unit without return-air filters.
OUTDOOR-AIR INLET SCREENS — Outdoor-air inlet
screens must be in place before operating unit.
GAS HEAT — Verify gas pressures before turning on heat as
follows:
1. Turn off manual gas stop.
2. Connect pressure gage to supply gas pressure tap (see
Fig. 13).
3. Connect pressure gage to manifold pressure tap on gas
valve.
4. Turn on manual gas stop and set thermostat to HEAT
position. Adjust set point to several degrees above the
current room temperature to ensure a heat demand. After
the unit has run for several minutes, verify that incoming
pressure is 5.5 in. wg or greater, and that the manifold
pressure is 3.3 in. wg. If manifold pressure must be adjusted, refer to Gas Valve Adjustment section on page 43.
5. After unit has been in operation for 5 minutes, check temperature rise across the heat exchangers. See unit informative plate for correct rise limits of the heat supplied.
Air quantities may need to be adjusted to bring the actual
rise to within the allowable limits.
36
Routine 2 (DXCTLO < OAT < 68 F)
• If only Y1 energized, the economizer maintains a SASP
= (SATLO1 + 3).
• If SAT > SASP + 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 Y1 and Y2 energized economizer maintains an
SASP = SATLO2 + 3.
• If SAT > SASP + 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 Y1 and Y2
using minimum on and off times and watching the supply air temperature as compared to SATLO1 and
SATLO2 set points.
If optional power exhaust is installed, as the outdoor-air
damper opens and closes, the power exhaust fans will be energized and deenergized.
If field-installed accessory 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, UNITS WITH ECONOMI$ER2, PREMIERLINK
CONTROL AND A THERMOSTAT — When the thermostat
calls for heating, terminal W1 is energized. The PremierLink
control will move the economizer damper to the minimum
position if there is a call for G and closed if there is a call for
W1 without G. In order to prevent thermostat from short cycling, the unit is locked into the heating mode for at least
10 minutes when W1 is energized. The induced-draft motor is
then energized and the burner ignition sequence begins.
On units equipped for two stages of heat, when additional
heat is needed, W2 is energized and the high-fire solenoid on
the main gas valve (MGV) is energized. When the thermostat
is satisfied and W1 is deenergized, the IFM stops after a
45-second time-off delay unless G is still maintained.
COOLING, UNITS WITH ECONOMI$ER2, PREMIERLINK 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 calculation as indicated by Fig. 46.
The PremierLink controller 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 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
Above 50 F supply-air temperature, the dampers will modulate from 100% open to the minimum open position. From 50 F
to 45 F supply-air temperature, the dampers will maintain
at the minimum open position. Below 45 F the dampers 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 power exhaust is installed, as the outdoor-air
damper opens and closes, the power exhaust fan will be energized and deenergized.
If field-installed accessory CO2 sensors are connected to the
EconoMi$erIV control, a demand controlled ventilation strategy will begin to operate. As the CO2 level in the zone increases
above the CO2 set point, the minimum position of the damper
will be increased proportionally. As the CO2 level decreases
because of the increase in fresh air, the outdoor-air damper will
be proportionally closed. Damper position will follow the higher demand condition from DCV mode or free cooling mode.
Damper movement from full closed to full open (or vice
versa) will take between 11/2 and 21/2 minutes.
If free cooling can be used as determined from the appropriate changeover command (switch, dry bulb, enthalpy curve,
differential dry bulb, or differential enthalpy), a call for cooling
(Y1 closes at the thermostat) will cause the control to modulate
the dampers open to maintain the supply air temperature set
point at 50 to 55 F.
As the supply-air temperature drops below the set point
range of 50 to 55 F, the control will modulate the outdoor-air
dampers closed to maintain the proper supply-air temperature.
HEATING, UNITS WITH ECONOMI$ERIV — When the
room thermostat calls for heat, the heating controls are energized as described in the Heating, Units Without Economizer
section. When the indoor fan is energized, the economizer
damper moves to the minimum position. When the indoor fan
is off, the economizer damper is fully closed.
COOLING, UNITS WITH ECONOMI$ER2, PREMIERLINK™ CONTROL AND A THERMOSTAT — When free
cooling is not available, the compressors will be controlled by
the PremierLink control in response to the Y1 and Y2 inputs
from the thermostat.
The 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 thermostat
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 Y1 and Y2 calls from
the thermostat using the following three routines. The three
control routines are based on OAT.
The 3 routines are based on OAT where:
SASP = Supply Air Set Point
DXCTLO = Direct Expansion Cooling Lockout Set Point
PID = Proportional Integral
Routine 1 (OAT < DXCTLO)
• Y1 energized – economizer maintains a SASP =
(SATLO1 + 3).
• Y2 energized – economizer maintains a SASP =
(SATLO2 + 3).
37
If all of the above conditions are met, the number of heat
stages is calculated; otherwise the required number of heat
stages will be set to 0.
If the PremierLink controller determines 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=1 (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 HS1 is deenergized.
When HS1 is energized the induced-draft motor is then
energized and the burner ignition sequence begins. On units
equipped for two stages of heat, when additional heat is needed, HS2 is energized and the high-fire solenoid on the main gas
valve (MGV) is energized. When the space condition is satisfied and HS1 is deenergized the IFM stops after a 45-second
time-off delay unless in the occupied mode. The fan will run
continuously in the occupied mode as required by national
energy and fresh air standards.
into the zone. The supply air will maintain the space temperature between the heating and cooling set points as indicated in
Fig. 47.
The PremierLink™ will integrate the compressors stages
with the economizer based on similar logic as the three routines
listed in the previous section. The SASP will float up and down
based on the error reduction calculations that compare space
temperature and space set point.
When outdoor-air temperature conditions require the economizer to close for a compressor stage-up sequence, the economizer control integrator is reset to zero after the stage-up sequence is completed. This prevents the supply-air temperature
from dropping too quickly and creating a freeze condition that
would make the compressor turn off prematurely.
The high space set point is used for DX (direct expansion)
cooling control, while the economizer space set point is a
calculated value between the heating and cooling set points.
The 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.
The compressors may be used for initial cooling then the
PremierLink controller will modulate the economizer using an
error reduction calculation to hold the space temperature
between the heating and cooling set points. See Fig. 47.
The 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
damper moves to minimum position. The operating sequence
is complete. The ECSR is recalculated every 30 seconds.
If an optional power exhaust is installed, as the outdoor-air
damper opens and closes, the power exhaust fans will be
energized and deenergized.
If field-installed accessory 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 — Every 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.
SPACE TEMPERATURE
TEMPERATURE CONTROL
75
74
73
72
SET POINT
TEMPERATURE
71
70
69
68
TIME
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
SPACE TEMPERATURE
TEMPERATURE CONTROL
75
74
73
72
COOL SETPOINT
TEMPERATURE
HEAT SETPOINT
71
70
69
68
TIME
Fig. 47 — Economizer Temperature
Control Example
38
SERVICE
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
regularly scheduled maintenance procedures to ensure long life
of the coil. Failure to clean the coils may result in reduced durability 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-flammable, hypoallergenic, nonbacterial, and a USDA accepted biodegradable agent that will not harm the coil or surrounding components such as electrical wiring, painted metal surfaces, or insulation. Use of non-recommended coil cleaners is strongly
discouraged since coil and unit durability could be affected.
Totaline Environmentally Sound Coil Cleaner Application
Equipment
• 21/2 gallon garden sprayer
• Water rinse with low velocity spray nozzle
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 personal injury.
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 access to unit interior.
COIL MAINTENANCE AND CLEANING RECOMMENDATION — Routine cleaning of coil surfaces is essential to
maintain proper operation of the unit. Elimination of contamination and removal of harmful residues will greatly increase
the life of the coil and extend the life of the 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
MOTOR
INTEGRATED GAS
UNIT CONTROLLER
(HIDDEN)
VIEW
PORT
CONTROL BOX
ACCESS PANEL
Harsh chemicals, household bleach or acid or basic cleaners should not be used to clean outdoor or indoor coils of
any kind. These cleaners can be very difficult to rinse out
of the coil and can accelerate corrosion at the fin/tube interface where dissimilar materials are in contact. If there is
dirt below the surface of the coil, use the Totaline environmentally sound coil cleaner as described above.
IGC
FAULT
CODE
LABEL
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.
COMBUSTION
FAN HOUSING
MAIN BURNER
SECTION
FLUE BOX
COVER
Totaline Environmentally Sound Coil Cleaner Application
Instructions
1. Proper eye protection such as safety glasses is recommended during mixing and application.
2. Remove all surface loaded fibers and dirt with a vacuum
cleaner as described above.
3. Thoroughly 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
21/2 gallon garden sprayer according to the instructions
included with the cleaner. The optimum solution temperature is 100 F.
NOTE: Do NOT USE water in excess of 130 F, as the enzymatic activity will be destroyed.
5. Thoroughly 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 apply cleaner with a vertical, up-and-down motion. Avoid
spraying in horizontal pattern to minimize potential for
fin damage.
7. Ensure cleaner thoroughly penetrates deep into finned
areas.
8. Interior and exterior finned areas must be thoroughly
cleaned.
9. Finned surfaces should remain wet with cleaning solution
for 10 minutes.
MAIN GAS
VALVE
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 brush may
be used. In either case, the tool should be applied in the direction of the fins. Coil surfaces can be easily damaged (fin edges
can be easily bent over and damage to the coating of a protected 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 the fibers and dirt into the coil.
This will make cleaning efforts more difficult. Surface loaded
fibers must be completely removed prior to using low velocity
clean water rinse.
Periodic Clean Water Rinse — A periodic clean water rinse is
very beneficial for coils that are applied in coastal or industrial
environments. However, it is very important that the water
rinse is made with very low velocity water stream to avoid
damaging the fin edges. Monthly cleaning as described below
is recommended.
Routine Cleaning of Coil Surfaces — Monthly cleaning with
Totaline® environmentally sound coil cleaner is essential to
extend the life of coils. This cleaner is available from Carrier
Replacement parts division as part number P902-0301 for a
one gallon container, and part number P902-0305 for a 5 gallon
container. It is recommended that all coils, including standard
39
Lubrication
10. Ensure surfaces are not allowed to dry before rinsing.
Reapplying cleaner as needed to ensure 10-minute saturation is achieved.
11. Thoroughly rinse all surfaces with low velocity clean
water using downward rinsing motion of water spray
nozzle. Protect fins from damage from the spray nozzle.
CONDENSATE DRAIN — Check and clean each year at
start 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 all precautions on anti-freeze labeling.
FILTERS — Clean or replace at start of each heating and cooling 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
filters 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 Main Burners section on 43.
FLUE GAS PASSAGEWAYS — The flue collector box and
heat exchanger cells may be inspected by removing heat exchanger 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 with a wire
brush.
Use caution with ceramic heat exchanger baffles. When installing retaining clip, be sure the center leg of the clip extends
inward toward baffle. See Fig. 49.
COMPRESSORS — Each compressor is charged with the
correct amount of oil at the factory. Conventional white oil
(Sontext 200LT) is used. White oil is compatible with 3GS oil,
and 3GS oil may be used if the addition of oil is required. See
compressor nameplate for original oil charge. A complete recharge should be four ounces less than the original oil charge.
When a compressor is 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. The compressor should then be run
for 10 minutes, shut down, and the access valve opened until
no oil flows. This should be repeated twice to make sure the
proper oil level has been achieved.
FAN SHAFT BEARINGS — For size 016 units, bearings are
permanently lubricated. No field lubrication is required. For
size 020-028 units, lubricate bearings at least every 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
Texaco
Mobil
Sunoco
Texaco
LUBRICANT
Regal AFB-2*
Mobilplex EP No. 1
Prestige 42
Multifak 2
*Preferred lubricant because it contains rust and oxidation inhibitors.
CONDENSER AND EVAPORATOR-FAN MOTOR
BEARINGS — The condenser-fan and evaporator-fan motors
have permanently sealed bearings, so no field lubrication is
necessary.
CERAMIC
BAFFLE
Evaporator Fan Performance Adjustment
(Fig. 50-52) — Fan motor pulleys are factory set for speed
shown in Table 1.
To change fan speeds:
1. Shut off unit power supply.
2. a. Size 016 Only: Loosen belt by loosening carriage
nuts holding motor mount assembly to fan scroll
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 remove belt. Secure
motor in this position by tightening the nuts on the
carriage bolts.
3. Loosen movable-pulley flange setscrew (see Fig. 50).
4. Screw movable flange toward fixed flange to increase
speed and away from fixed flange to decrease speed. Increasing fan speed increases load on motor. Do not exceed maximum speed specified in Table 1.
See Table 20 for air quantity limits.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew. (See Table 1 for speed change for each
full turn of pulley flange.)
6. Replace and tighten belts. See Belt Tension Adjustment
section on page 42.
To align fan and motor pulleys:
1. Loosen fan pulley setscrews.
2. Slide fan pulley along fan shaft.
3. Make angular alignment by loosening motor from
mounting plate.
CLIP
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 assure 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 determine proper cleaning frequency.
To inspect blower wheel, remove heat exchanger access
panel. Shine a flashlight into opening to inspect wheel. If cleaning is required, remove motor and wheel assembly by removing 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 motor shaft and clean with a detergent or solvent. Replace motor
and wheel assembly.
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.
2. Remove unit top panel.
3. Loosen carriage nuts A and B holding motor mount
assembly to fan scroll side plates.
4. Loosen screw C.
5. Rotate motor mount assembly (with motor attached) as
far as possible away from evaporator coil.
6. Remove belt.
7. Rotate motor mount assembly back past original position
toward evaporator coil.
8. Remove motor mounting nuts D and E (both sides).
9. Lift motor up through top of unit.
10. Reverse above procedure to reinstall motor.
11. Check and adjust belt tension as necessary.
48TJ020-028 UNITS (See Fig. 52) — The 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 heating control access panel.
2. 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 the carriage bolts.
5. Remove the belt drive.
6. Remove jacking bolt and tapped jacking bolt plate.
7. Remove the 2 screws that secure the motor mounting
plate to the motor support channel.
8. Remove the 3 screws from the end of the motor support
channel that interfere with the motor slide path.
Fig. 51 — 48TJ016 Evaporator-Fan
Motor Adjustment
NOTE: A 31/2-in. bolt and threaded plate are included in the
installer’s packet. They should be added to the motor support channel below the motor mounting plate to aid in raising the motor. The
plate part number is 50DP503842. The adjustment bolt is 3/8-16 x
13/4 in. LG.
Fig. 52 — 48TJ020-028 Evaporator-Fan
Motor Section
Fig. 50 — Evaporator-Fan Pulley and Adjustment
41
GTAC II; Module 5; Charging, Recovery, Recycling, and
Reclamation section for charging methods and procedures.
Unit panels must be in place when unit is operating during
charging procedure.
NOTE: Do not use recycled refrigerant as it may contain
contaminants.
NO CHARGE — Use standard evacuating techniques. After
evacuating system, weigh in the specified amount of refrigerant (refer to Table 1).
LOW CHARGE COOLING — Using cooling charging chart
(see Fig. 55), add or remove refrigerant until conditions of the
chart are met. Note that charging chart is different from those
normally used. An accurate pressure gage and temperaturesensing device is required. Charging is accomplished by ensuring the proper amount of liquid sub-cooling. Measure liquid
line pressure at the liquid line service valve using pressure
gage. Connect temperature sensing device to the liquid line
near the liquid line service valve and insulate it so that outdoor
ambient temperature does not affect reading.
TO USE THE COOLING CHARGING CHART — Use the
above temperature and pressure readings, and find the intersection point on the cooling charging chart. If intersection point
on chart is above line, add refrigerant. If intersection point on
chart is below line, carefully recover some of 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.
The TXV (thermostatic expansion valve) is set to maintain
between 15 and 20 degrees of superheat at the compressors.
The valves are factory set and should not require re-adjustment.
MOISTUREMI$ER™ SYSTEM CHARGING — The system charge for units with the MoistureMi$er option is greater
than that of the standard unit alone. The charge for units with
this option is indicated on the unit nameplate drawing. To
charge systems using the MoistureMi$er dehumidification
package, fully evacuate, recover, and re-charge the system to
the nameplate specified charge level. To check or adjust
refrigerant charge on systems using the MoistureMi$er dehumidification package, charge per the standard subcooling
charts. The subcooler MUST be deenergized to use the charging charts. The charts reference a liquid pressure (psig) and
temperature at a point between the condenser coil and the subcooler coil. A tap is provided on the unit to measure liquid
pressure entering the subcooler (leaving the condenser).
9. Slide out the motor and motor mounting plate.
10. Disconnect wiring connections and remove the 4 mounting bolts.
11. Remove the motor.
12. To install 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 (1/2 in. deflection with one finger).
b. Size 020-028 Units:
Turn motor jacking bolt to move motor mounting
plate up or down for proper belt tension (3/8 in.
deflection at midspan with one finger [9 lb force]).
3. Tighten nuts.
4. Adjust bolts and nut on mounting plate to secure motor in
fixed position.
Condenser-Fan Adjustment
48TJ016,020 UNITS (Fig. 53)
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 rubber hubcap to prevent
hub from rusting to motor shaft.
5. Fill hub recess with permagum if rubber hubcap is
missing.
Power Failure — Dampers have a spring return. In event
of power failure, dampers will return to fully closed position
until power is restored. Do not manually operate economizer
motor.
Refrigerant Charge — Amount of refrigerant charge is
listed on unit nameplate and in Table 1. Refer to Carrier
LIQUID TEMPERATURE AT LIQUID VALVE (DEG F)
BOTH CIRCUITS
ALL OUTDOOR FANS MUST BE OPERATING
NOTE: Dimensions are in inches.
Fig. 53 — Condenser Fan Adjustment, 48TJ016,020
140
120
ADD CHARGE IF ABOVE CURVE
100
80
REDUCE CHARGE IF BELOW CURVE
60
40
50
150
100
200
250
350
300
LIQUID PRESSURE AT LIQUID VALVE (PSIG)
Fig. 55 — Cooling Charging Chart
NOTE: Dimensions are in inches.
Fig. 54 — Condenser-Fan Adjustment, 48TJ024,028
42
400
Gas Valve Adjustment
Protective Devices
NATURAL GAS — The gas valve opens and closes in response to the thermostat or limit control.
When power is supplied to valve terminals D1 and C2, the
main valve opens to its preset position.
The regular factory setting is stamped on the valve 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 1/8-in. pipe plug from manifold or gas valve
pressure tap connection. Install a suitable pressuremeasuring device.
4. Set main gas valve to ON position.
5. Set thermostat 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 setting for no call for heat, turn off main gas valve, remove
pressure-measuring device, and replace 1/8-in. pipe plug
and screw cap.
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 the 3-phase voltage inputs to provide
phase loss protection for the 3-phase device.
Overcurrent — Each compressor has internal line break motor
protection, except the circuit no. 1 on the 48TJ028 units. Compressor no. 1 on the 48TJ028 unit uses an electronic module,
located with the compressor junction box, to provide motor
protection. This electronic module monitors winding and discharge temperatures. If these temperatures reach the trip values, the module interrupts the control line and causes the
compressor to switch off.
Crankcase Heater — Only the 48TJ028 unit and units with
optional MoistureMi$er™ dehumidification system are
equipped with a 70-watt crankcase heater to prevent absorption
of liquid refrigerant by oil in the crankcase when the compressor is idle. The crankcase heater is energized whenever there is
a main power to the unit and the compressor is not energized.
IMPORTANT: After a prolonged shutdown or servicing,
energize the crankcase heaters for 24 hours before starting the compressors.
Compressor Lockout — If any of the safeties (high-pressure,
low-pressure, freeze protection thermostat, compressor internal
thermostat) trip, or if there is loss of power to the compressors,
the cooling lockout (CLO) will lock the compressors off. To
reset, manually move the thermostat setting.
EVAPORATOR-FAN MOTOR PROTECTION — A manual reset, calibrated trip, magnetic circuit breaker protects
against overcurrent. Do not bypass connections or increase the
size of the breaker to correct trouble. Determine the cause and
correct it before resetting the breaker.
CONDENSER-FAN MOTOR PROTECTION — Each
condenser-fan motor is internally protected against
overtemperature.
HIGH-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 thermostat setting.
FREEZE PROTECTION THERMOSTAT (FPT) — An FPT
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.
Fig. 56 — Gas Valve
Main Burners — For all applications, main burners are
factory 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 access 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 brush, clean burners and crossover port as
required.
4. Adjust spark gap. See Fig. 57.
5. Reinstall burners on rack.
6. Reinstall burner rack as described above.
Relief Devices — All units have relief devices to protect
against damage from excessive pressures (i.e., fire). These
devices protect the high and low side.
Control Circuit, 24-V — This control circuit is protected against overcurrent by a 3.2 amp circuit 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 arrangement.
Replacement Parts — A complete list of replacement
parts may be obtained from any Carrier distributor upon
request.
Diagnostic IGC Control LEDs — The IGC board
has LEDs for diagnostic purposes. Refer to Troubleshooting
section on page 48.
Filter Drier — Replace whenever refrigerant system is
exposed to atmosphere.
43
Optional Hinged Access Doors — When the optional
Two internal access doors are provided inside the filter/
drive access door. The filter access door (on the left) is secured
by 2 small 1/4 turn latches with folding bail-type handles. This
door must be opened prior to opening the drive access door.
The drive access door is shipped with 2 sheet metal screws
holding the door closed. Upon initial opening of the door, these
screws may be removed and discarded. The door is then held
shut by the filter access door, which closes over it.
service package is ordered or the if the hinged access doors
option is ordered, the unit will be provided with external and
internal hinged access doors to facilitate service.
Four external hinged access doors are provided. All external
doors are provided with 2 large 1/4 turn latches with folding
bail-type handles. (Compressor access doors have one latch.) A
single door is provided for filter and drive access. One door is
provided for control box access. The control box access door is
interlocked with the non-fused disconnect which must be in the
OFF position to open the door. Two doors are provided for access to the compressor compartment.
SEE
DETAIL
"C"
48TJD016
SEE
DETAIL
"C"
48TJD020-028 AND 48TJF016
SEE
DETAIL
"C"
48TJF020-028
Fig. 57 — Spark Gap Adjustment
44
Fig. 58 — Typical Wiring Schematic (48TJ016, 208/230-V Shown)
45
Fig. 59 — Typical Component Arrangement (48TJ016 Unit Shown)
46
LEGEND AND NOTES FOR FIG. 58 AND 59
LEGEND
AHA
BKR W/AT
C
CAP
CB
CC
CLO
COMP
DM
DU
EQUIP
FPT
FU
GND
HPS
IAQ
IDM
IFM
IGC
L
LED
LPS
LS
MGV
NEC
OAT
OCCUP
OFC
OFM
PL
PMR
QT
RAT
RS
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
SN
TB
TC
TH
TRAN
Adjustable, Heat Anticipator
Breaks with Amp Turns
Contactor, Compressor
Capacitor
Circuit Breaker
Cooling Compensator
Compressor Lockout
Compressor Motor
Damper Motor
Dummy Terminal
Equipment
Freeze Protection Thermostat
Fuse
Ground
High-Pressure Switch
Indoor Air Quality Sensor
Induced-Draft Motor
Indoor-Fan Motor
Integrated Gas Unit Controller
Light
Light Emitting Diode
Low-Pressure Switch
Limit Switch
Main Gas Valve
National Electrical Code
Outdoor Air Temperature Sensor
Occupancy Sensor
Outdoor-Fan Contactor
Outdoor-Fan Motor
Plug Assembly
Phase Monitor Relay
Quadruple Terminal
Return Air Temperature Sensor
Rollout Switch
—
—
—
—
—
Sensor
Terminal Block
Thermostat Cooling
Thermostat Heating
Transformer
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
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 fan 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 location of used contacts. A bracket over (2) numbers signifies a single
pole, double throw contact. An underlined number signifies a normally closed contact. Plain (no line)
number signifies a normally open contact.
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 IAQ 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 P1 and set
control minimum position POT to the minimum position.
47
TROUBLESHOOTING
Unit Troubleshooting — Refer to Tables 27-29 and
should turn on. The actuator should drive to between 90
and 95% open.
4. Turn the Exhaust potentiometer CW until the 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$erIV preparation procedure has
been performed.
2. Connect a 9-v battery to AQ (positive node) and AQ1
(negative node). The DCV LED should turn on. The
actuator should drive to between 90 and 95% open.
3. Turn the DCV Maximum Position potentiometer to midpoint. The actuator should drive to between 20 and 80%
open.
4. Turn the DCV Maximum Position potentiometer to fully
CCW. The actuator should drive fully closed.
5. Turn the Minimum Position potentiometer to midpoint.
The actuator should drive to between 20 and 80% open.
6. Turn the Minimum Position Potentiometer fully CW. The
actuator should drive fully open.
7. Remove the jumper from TR and N. The actuator should
drive fully closed.
8. Return EconoMi$erIV settings and wiring to normal
after completing troubleshooting.
SUPPLY-AIR INPUT — To check supply-air input:
1. Make sure EconoMi$erIV preparation procedure has
been performed.
2. Set the Enthalpy potentiometer to A. The Free Cool LED
turns on. The actuator should drive to between 20 and
80% open.
3. Remove the 5.6 kilo-ohm resistor and jumper T to T1.
The actuator should drive fully open.
4. Remove the jumper across T and T1. The actuator should
drive fully closed.
5. Return EconoMi$erIV settings and wiring to normal
after completing troubleshooting.
ECONOMI$ER IV TROUBLESHOOTING COMPLETION — This procedure is used to return the EconoMi$erIV
to operation. No troubleshooting or testing is done by performing the following procedure.
1. Disconnect power at TR and TR1.
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 +.
6. Remove 1.2 kilo-ohm checkout resistor from terminals SO
and +. If used, reconnect sensor from terminals SO and +.
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 P1. Reconnect device at P and
P1.
11. Apply power (24 vac) to terminals TR and TR1.
Fig. 60.
EconoMi$erIV Troubleshooting — See Table 30
for EconoMi$erIV logic.
A functional view of the EconoMi$erIV is shown in Fig. 61.
Typical settings, sensor ranges, and jumper positions are also
shown. An EconoMi$erIV simulator program is available from
Carrier to help with EconoMi$erIV training and troubleshooting.
ECONOMI$ERIV PREPARATION — This procedure is
used to prepare the EconoMi$erIV for troubleshooting. No
troubleshooting or testing is done by performing the following
procedure.
NOTE: This procedure requires a 9-v battery, 1.2 kilo-ohm
resistor, and a 5.6 kilo-ohm resistor which are not supplied
with the EconoMi$erIV.
IMPORTANT: Be sure to record the positions of all potentiometers before starting troubleshooting.
1. Disconnect power at TR and TR1. All LEDs should be
off. Exhaust fan contacts should be open.
2. Disconnect device at P and P1.
3. Jumper P to P1.
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 +.
Connect 1.2 kilo-ohm 4074EJM checkout resistor across
terminals SO and +.
8. Put 620-ohm resistor across terminals SR and +.
9. Set minimum position, DCV set point, and exhaust
potentiometers fully CCW (counterclockwise).
10. Set DCV maximum position potentiometer fully CW
(clockwise).
11. Set enthalpy potentiometer to D.
12. Apply power (24 vac) to terminals TR and TR1.
DIFFERENTIAL ENTHALPY — To check differential
enthalpy:
1. Make sure EconoMi$erIV preparation procedure has
been performed.
2. Place 620-ohm resistor across SO and +.
3. Place 1.2 kilo-ohm resistor across SR and +. The Free
Cool LED should be lit.
4. Remove 620-ohm resistor across SO and +. The Free
Cool LED should turn off.
5. Return EconoMi$erIV settings and wiring to normal
after completing troubleshooting.
SINGLE ENTHALPY — To check single enthalpy:
1. Make sure EconoMi$erIV preparation procedure has
been performed.
2. Set the enthalpy potentiometer to A (fully CCW). The
Free Cool LED should be lit.
3. Set the enthalpy potentiometer to D (fully CW). The Free
Cool LED should turn off.
4. Return EconoMi$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 preparation procedure has
been performed.
2. Ensure terminals AQ and AQ1 are open. The LED for
both DCV and Exhaust should be off. The actuator
should be fully closed.
3. Connect a 9-v battery to AQ (positive node) and AQ1
(negative node). The LED for both DCV and Exhaust
48
Table 27 — Cooling Service Analysis
PROBLEM
Compressor and
Condenser Fan
Will Not Start.
Compressor Will Not
Start but Condenser Fan
Runs.
Compressor Cycles
(other than normally
satisfying thermostat).
Compressor Operates
continuously.
Excessive Head
Pressure.
Head Pressure Too Low.
Excessive Suction
Pressure.
Suction Pressure Too
Low.
CAUSE
Power failure.
Fuse blown or circuit breaker tripped.
Defective thermostat, contactor, transformer, or control
relay.
Insufficient line voltage.
Incorrect or faulty wiring.
Thermostat setting too high.
Three phase power incorrectly connected (sizes 016 and
020 only). Indicated by flashing red LED on Phase Monitor Relay (PMR) board (see Control Box Component
Arrangement for location).
Faulty wiring or loose connections in compressor circuit.
Compressor motor burned out, seized, or internal overload open.
Defective overload.
Compressor locked out
One leg of 3-phase power dead.
Refrigerant overcharge or undercharge.
Defective compressor.
Insufficient line voltage.
Blocked condenser.
Defective overload.
Defective thermostat.
Faulty condenser-fan motor.
Restriction in refrigerant system.
Dirty air filter.
Unit undersized for load.
Thermostat set too low.
Low refrigerant charge.
Air in system.
Condenser coil dirty or restricted.
Dirty air filter.
Dirty condenser coil.
Refrigerant overcharged.
Faulty TXV.
Air in system.
Condenser air restricted or air short-cycling.
Low refrigerant charge.
Restriction in liquid tube.
High heat load.
Faulty TXV.
Refrigerant overcharged.
Dirty air filter.
Low refrigerant charge.
Metering device or low side restricted.
Faulty TXV.
Insufficient evaporator airflow.
Temperature too low in conditioned area.
Field-installed filter drier restricted.
LEGEND
TXV — Thermostatic Expansion Valve
49
REMEDY
Call power company.
Replace fuse or reset circuit breaker.
Replace component.
Determine cause and correct.
Check wiring diagram and rewire correctly.
Lower thermostat setting below room temperature.
Correct field power phasing.
Check wiring and repair or replace.
Determine cause. Replace compressor.
Determine cause and replace.
Determine cause for safety trip and reset lockout.
Replace fuse or reset circuit breaker.
Determine cause.
Recover refrigerant, evacuate system, and recharge
to nameplate.
Replace and determine cause.
Determine cause and correct.
Determine cause and correct.
Determine cause and replace.
Replace thermostat.
Replace.
Locate restriction and remove.
Replace filter.
Decrease load or increase unit size.
Reset thermostat.
Locate leak, repair, and recharge.
Recover refrigerant, evacuate system, and recharge.
Clean coil or remove restriction.
Replace filter.
Clean coil.
Recover excess refrigerant.
1. Check TXV bulb mounting and secure tightly to
suction line.
2. Replace TXV if stuck open or closed.
Recover refrigerant, evacuate system, and recharge.
Determine cause and correct.
Check for leaks, repair, and recharge.
Remove restriction.
Check for source and eliminate.
1. Check TXV bulb mounting and secure tightly to
suction line.
2. Replace TXV if stuck open or closed.
Recover excess refrigerant.
Replace filter.
Check for leaks, repair, and recharge.
Remove source of restriction.
1. Check TXV bulb mounting and secure tightly to
suction line.
2. Replace TXV if stuck open or closed.
Increase air quantity. Check filter and replace if
necessary.
Reset thermostat.
Replace.
Table 28 — Heating Service Analysis
PROBLEM
Burners Will Not
Ignite.
CAUSE
Misaligned spark electrodes.
No gas at main burners.
Water in gas line.
No power to furnace.
No 24 v power supply to control circuit.
Inadequate Heating.
Miswired or loose connections.
Burned-out heat anticipator in thermostat.
Broken thermostat wires.
Dirty air filter.
Gas input to unit too low.
Unit undersized for application.
Restricted airflow.
Blower speed too low.
Limit switch cycles main burners.
Too much outdoor air.
Poor Flame
Characteristics.
Incomplete combustion (lack of combustion air)
results in:
Aldehyde odors, CO, sooting flame, or floating flame.
Burners Will Not Turn Unit is locked into Heating mode for a one minute
Off.
minimum.
REMEDY
Check flame ignition and sensor electrode positioning.
Adjust as needed.
Check gas line for air; purge as necessary. After purging
gas line of air, allow gas to dissipate for at least 5 minutes before attempting to relight unit.
Check gas valve.
Drain water and install drip leg to trap water.
Check power supply, fuses, wiring, and circuit breaker.
Check transformer. Transformers with internal overcurrent protection require a cool-down period before
resetting. Check 24-v circuit breaker; reset if necessary.
Check all wiring and wire nut connections.
Replace thermostat.
Run continuity check. Replace wires if necessary.
Clean or replace filter as necessary.
Check gas pressure at manifold. Check gas meter for
input. If too low, increase manifold pressure or replace
with correct orifices.
Replace with proper unit or add additional unit.
Clean filter, replace filter, or remove any restrictions.
Install alternate motor, if applicable, or adjust pulley to
increase fan speed.
Check rotation of blower, thermostat heat anticipator settings, and temperature rise of unit. Adjust as needed.
Adjust minimum position.
Check economizer operation.
Check all screws around flue outlets and burner compartment. 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.
Wait until mandatory one-minute time period has
elapsed or cycle power to unit.
Table 29 — MoistureMi$er™ Dehumidification Subcooler Service Analysis
PROBLEM
Subcooler Will Not Energize
CAUSE
No power to subcooler control transformer.
No power from subcooler control transformer to
liquid line three-way valve.
Liquid line three-way valve will not operate.
Subcooler Will Not Deenergize
Low System Capacity
Liquid line three-way valve will not close.
Low refrigerant charge or frosted coil.
50
REMEDY
Check power source. Ensure all wire connections
are tight.
1. Fuse open; check fuse. Ensure continuity of wiring.
2. Subcooler control low-pressure switch open.
Cycle unit off and allow low-pressure switch
to reset. Replace switch if it will not close.
3. Transformer bad; check transformer.
1. Solenoid coil defective; replace.
2. Solenoid valve stuck closed; replace.
Valve is stuck open; replace.
1. Check charge amount. See system charging
section.
2. Evaporator coil frosted; check and replace
subcooler control low-pressure switch if necessary.
LEGEND
IGC — Integrated Gas Unit Controller
NOTE: Thermostat Fan Switch in the “AUTO”
position.
Fig. 60 — IGC Control (Heating and Cooling)
51
Table 30 — EconoMi$erIV Input/Output Logic
Demand Control
Ventilation (DCV)
Below set
(DCV LED Off)
Above set
(DCV LED On)
INPUTS
Enthalpy*
Outdoor
OUTPUTS
N Terminal†
Occupied
Unoccupied
Stage Stage
1
2
Damper
On
On
Minimum position
Closed
On
Off
Off
Off
On
Off
Modulating** (between min.
Modulating** (between
position and full-open)
closed and full-open)
Off
Off
Off
Off
Minimum position
Closed
On
On
Modulating†† (between min. Modulating†† (between
position and DCV maximum) closed and DCV
On
Off
maximum)
Off
Off
On
Off
Modulating***
Modulating†††
Off
Off
Off
Off
Compressor
Return
High
(Free Cooling LED Off)
Low
Low
(Free Cooling LED On)
High
High
(Free Cooling LED Off)
Low
Low
(Free Cooling LED On)
High
Y1
Y2
On
On
Off
On
On
Off
On
On
Off
On
On
Off
On
Off
Off
On
Off
Off
On
Off
Off
On
Off
Off
***Modulation is based on the greater of DCV and supply air sensor
signals, between minimum position and either maximum position
(DCV) or fully open (supply air signal).
†††Modulation is based on the greater of DCV and supply air sensor signals, between closed and either maximum position (DCV)
or fully open (supply air signal).
*For single enthalpy control, the module compares outdoor
enthalpy to the ABCD set point.
†Power at N terminal determines Occupied/Unoccupied setting:
24 vac (Occupied), no power (Unoccupied).
**Modulation is based on the supply air sensor signal.
††Modulation is based on the DCV signal.
Fig. 61 — EconoMi$erIV Functional View
52
INDEX
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 28
Settings 27, 29
Combustion blower wheel 40
Compressor
Lubrication 40
Mounting 31
Rotation 31
Concentric duct 9
Condensate drain
Cleaning 40
Location 9, 10
Condenser coil 7
Cleaning 39
Condenser fan 7
Adjustment 42
Control circuit
Wiring 11
Convenience outlet 12
Crankcase heater 31, 43
Demand control ventilation 28
Dehumidification 29
Dimensions 3-6
Ductwork 9
EconoMi$erIV 23-29
Control mode 25
Controller wiring 24
Demand ventilation control 28
Dry bulb changeover 25
Enthalpy sensor 26
Troubleshooting 48, 52
Usage 25
Wiring 24
EconoMi$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
Lubrication 40
Motor data 36
Mounting 41
Performance 32-34
Pulley adjustment 41
Pulley setting 7, 35
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 17
Integrated gas controller 51
Error codes 51
Liquid propane 10
Low-pressure switch 8, 43
Main burners 40, 43
Manual outdoor air damper 14
MoistureMi$er™
dehumidification 29-31, 35, 42, 50
Motormaster® I control 15
Motormaster V control 16
Mounting
Compressor 31
Unit 2
Natural gas 8, 43
Non-fused disconnect 12
Operating limits 16
Operating sequence 36-38
Cooling 36
EconoMi$erIV 36, 37
EconoMi$er2 with
PremierLink™ control 37, 38
Heating 36, 37
Outdoor air hood 14
Outdoor air temperature sensor 17, 25
Outdoor air inlet screens
Cleaning 40
Dimensions 8
Physical data 7, 8
Power supply 11
Wiring 11
PremierLink controls 17-20
Pressure, drop
Economizer 35
MoistureMi$er 35
Pressure switches
High pressure 8
Low pressure 8
Refrigerant
Charge 7, 42
Type 7
Refrigerant service 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-1
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 12
Unit 45, 46
53
SERVICE TRAINING
Packaged Service Training programs are 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, theory, and skills programs are available, using popular video-based formats
and materials. All include video and/or slides, plus companion book.
Classroom Service Training which includes “hands-on” experience with the products in our labs can
mean increased confidence that really pays dividends in faster troubleshooting and fewer callbacks. Course
descriptions and schedules are in our catalog.
CALL FOR FREE CATALOG 1-800-644-5544
[ ] Packaged Service 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.
Catalog No. 04-53480009-01
Printed in U.S.A.
Form 48TJ-22SI
Pg 54
3-06
Replaces: 48TJ-21SI
Book 1 4
Tab 1a 6a
MODEL NO.:
SERIAL NO.:
DATE:
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
MOISTUREMI$ER™ DEHUMIDIFICATION SYSTEM ONLY)
START-UP
ELECTRICAL
SUPPLY VOLTAGE
L1-L2
L2-L3
L3-L1
COMPRESSOR AMPS — COMPRESSOR NO. 1
L1
L2
L3
— COMPRESSOR NO. 2
L1
L2
L3
SUPPLY FAN AMPS
EXHAUST FAN AMPS
TEMPERATURES
OUTDOOR-AIR TEMPERATURE
F DB (Dry-Bulb)
RETURN-AIR TEMPERATURE
F DB
COOLING SUPPLY AIR
F
GAS HEAT SUPPLY AIR
F
F WB (Wet-Bulb)
PRESSURES
GAS INLET PRESSURE
GAS MANIFOLD PRESSURE
REFRIGERANT SUCTION
REFRIGERANT DISCHARGE
STAGE NO. 1
CIRCUIT NO. 1
CIRCUIT NO. 1
IN. WG
IN. WG
PSIG
PSIG
STAGE NO. 2
CIRCUIT NO. 2
CIRCUIT NO. 2
IN. WG
PSIG
PSIG
VERIFY REFRIGERANT CHARGE USING CHARGING CHART ON PAGE 42.
GENERAL
ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS
Copyright 2006 Carrier Corporation
Book
Tab
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
1 4
Catalog No. 04-53480009-01
Printed in U.S.A.
Form 48TJ-22SI
Pg CL-1
3-06
Replaces: 48TJ-21SI
1a 6a
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - CUT ALONG DOTTED LINE
CUT ALONG DOTTED LINE
START-UP CHECKLIST
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