Carrier 48Tfd008 014 Users Manual

48TFF008-012 to the manual a800217e-ac22-4a34-8b65-f3daa3ba0313

2015-01-24

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48TFD008-014
48TFE008-014
48TFF008,012
Single-Package Rooftop Heating/Cooling Units
50 Hz

Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
Step 1 — Provide Unit Support . . . . . . . . . . . . . . . . . . . 1
• ROOF CURB
• SLAB MOUNT
Step 2 — Field Fabricate Ductwork . . . . . . . . . . . . . . . 2
Step 3 — Install External Trap for
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Step 4 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . 2
• POSITIONING
Step 5 — Install Flue Hood . . . . . . . . . . . . . . . . . . . . . . . 8
Step 6 — Install Gas Piping . . . . . . . . . . . . . . . . . . . . . . 8
Step 7 — Make Electrical Connection . . . . . . . . . . . . 8
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
• HEAT ANTICIPATOR SETTINGS
Step 8 — Adjust Factory-Installed Options . . . . . . 11
• APOLLO CONTROL
• MANUAL OUTDOOR-AIR DAMPER
• OPTIONAL DURABLADE ECONOMIZER
• OPTIONAL ECONOMI$ER
Step 9 — Adjust Evaporator-Fan Speed . . . . . . . . . 20
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-36
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36-41
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 42-46
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . CL-1

Disconnect gas piping from unit when leak testing at pressure greater than 3.4 kPa (1/2 psig).
Pressures greater than 3.4 kPa (1/2 psig) will
cause gas valve damage resulting in hazardous
condition. If gas valve is ever subjected to pressure greater than 3.4 kPa (1/2 psig), it must be
replaced before use. When pressure testing
field-supplied gas piping at pressures of 3.4 kPa
(1/2 psig) or less, a unit connected to such piping
must be isolated by manually closing the gas
valve(s).

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

INSTALLATION
Unit is shipped in the vertical discharge configuration. To
convert to horizontal configuration, remove screws from side
duct opening covers and remove covers. Using the same
screws, install covers on vertical duct openings with the insulation side down. Seals around duct openings must be tight. See
Fig. 1.

Step 1 — Provide Unit Support

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.

ROOF CURB — Assemble and install accessory roof curb in
accordance with instructions shipped with curb. See Fig. 2. Install insulation, cant strips, roofing felt, and counter flashing as
shown. Ductwork must be attached to curb. If gas, electric
power or control power is to be routed through the curb, attach
the accessory thru-the-curb service connection plates to the
roof curb in accordance with the accessory installation instructions. Connection plates must be installed before unit is set in
roof curb.
IMPORTANT: The gasketing of the unit to the roof curb
is critical for a watertight seal. Install gasket supplied
with the roof curb as shown in Fig. 2. Improperly
applied gasket can also result in air leaks and poor unit
performance.
Curb should be level. Unit leveling tolerances are shown in
Fig. 3. This is necessary for unit drain to function properly. Refer to Accessory Roof Curb Installation Instructions for additional information as required.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 004-816
Printed in U.S.A.
Form 48TF-C1SI
Pg 1
1-01
Replaces: New
Book 1 4
Tab 1a 6a

SLAB MOUNT (Horizontal Units Only) — Provide a level
concrete slab that extends a minimum of 152 mm (6 in.)
beyond unit cabinet. Install a gravel apron in front of condenser coil air inlet to prevent grass and foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.

To use the bottom drain connection for a roof curb installation, relocate the factory-installed plug (Red) from the bottom
connection to the side connection. See Fig. 4. The piping for
the condensate drain and external trap can be completed after
the unit is in place.
All units must have an external trap for condensate drainage. Install a trap at least 102-mm (4-in.) deep and protect
against freeze-up. If drain line is installed downstream from the
external trap, pitch the line away from the unit at 25 mm (1 in.)
per 3 m (10 ft) of run. Do not use a pipe size smaller than the
19-mm (3/4-in.) unit connection.

Step 2 — Field Fabricate Ductwork — Secure all
ducts to roof curb and building structure on vertical units. Do
not connect ductwork to unit. For horizontal applications, fieldsupplied flanges should be attached to horizontal discharge
openings and all ductwork secured to the flanges. 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.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with applicable fire codes.
A minimum clearance is not required around ductwork.
Cabinet return-air static shall not exceed –87 Pa (–.35 in. wg)
with Durablade economizer, –26 Pa (–.30 in. wg) with
EconoMi$er or –112 Pa (–.45 in. wg) without economizer.
These units are designed for a minimum heating operation
continuous return-air temperature of 10 C (50 F) (dry bulb), or
an intermittent operation down to 7 C (45 F) (dry bulb), such as
when used with a night set-back thermostat.

Step 4 — Rig and Place Unit — Inspect

unit for
transportation damage. File any claim with transportation
agency. Keep unit upright and do not drop. Spreader bars are
not required if top crating is left on unit. Rollers may be used to
move unit across a roof. Level by using unit frame as a reference. See Tables 1A and 1B and Fig. 5 for additional information. Operating weight is shown in Tables 1A and 1B and
Fig. 5.
Lifting holes are provided in base rails as shown in Fig. 5
and 6. Refer to rigging instructions on unit.

All panels must be in place when rigging.
POSITIONING — Maintain clearance around and above unit
to provide minimum distance from combustible materials,
proper airflow, and service access. See Fig. 6.
Do not install unit in an indoor location. Do not locate unit
air inlets near exhaust vents or other sources of contaminated
air.
Be sure that unit is installed so that snow will not block the
combustion intake or flue outlet.
Unit may be installed directly on wood flooring or on Class
A, B, or C roof-covering material when roof curb is used.
(Copy continued on page 4.)

Step 3 — Install External Trap for Condensate
Drain — The unit’s 19-mm (3/4-in.) condensate drain connections are located at the bottom and side of the unit. Unit discharge connections do not determine the use of drain connections; either drain connection can be used with vertical or horizontal applications.
When using the standard side drain connection, make sure
the plug (Red) in the alternate bottom connection is tight before
installing the unit.

Fig. 1 — Horizontal Conversion Panels
2

CONNECTOR
PKG. ACCY.
CRBTMPWR001A00
CRBTMPWR002A00
CRBTMPWR003A00
CRBTMPWR004A00

B

2′-87/16″
[827]

C

1′-1015/16″
[583]

D ALT
DRAIN
HOLE

GAS

13/4″
[44.5]

3/4″
[19] NPT
1/ ″
2
[12.7] NPT
3/4″
[19] NPT

POWER
4″ [19] NPT
11/4″ [31.7]

3/

3/4″

[19] NPT

11/4″ [31.7]

CONTROL
1/2″
[12.7]
1/ ″
2
[12.7]

ROOF CURB
ACCESSORY
CRRFCURB003A00
CRRFCURB004A00

“A”

UNIT SIZE
48TF

1′-2″ [356]
2′-0″ [610]

008-014

NOTES:
1. Roof curb accessory is shipped disassembled.
2. Insulated panels: 1-in. [25] thick polyurethane
foam, 13/4 lb density.
3. Dimensions in [ ] are in millimeters.
4. Roof curb: 16-gage steel.
5. Attach ductwork to curb (flanges of duct rest on
curb).
6. Service clearance 4 ft [1219] on each side.
7.

Direction of airflow.

8. Connector packages CRBTMPWR001A00 and
2A00 are for thru-the-curb gas type. Packages
CRBTMPWR003A00 and 4A00 are for thruthe-bottom type gas connections.

Fig. 2 — Roof Curb Details

3

Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Position unit on roof curb so that the following clearances
are maintained: 7 mm (1/4-in.) clearance between roof curb and
base rails on each side and duct end of unit; 84 mm (35/16-in.)
clearance between roof curb and condenser coil end of unit.
(See Fig. 2, section C-C.)
Locate mechanical draft system flue assembly at least
1219 mm (48 in.) from any opening through which combustion
products could enter the building, and at least 1219 mm (48 in.)
from an adjacent building or combustible material. When unit
is located adjacent to public walkways, flue assembly must be
at least 2.13 m (7 ft) above grade.
Flue vent discharge must have a minimum horizontal clearance of 1219 mm (48 in.) from electric and gas meters, gas regulators, and gas relief equipment.
Flue gas can deteriorate building materials. Orient unit so
that flue gas will not affect building materials.
Adequate combustion-air space must be provided for proper
operation of this equipment. Be sure that installation complies
with all local codes and Section 5.3, Air for Combustion and
Ventilation, NFGC (National Fuel Gas Code), ANSI (American National Standards Institute), latest revision, U.S.A.
Standards.
(Copy continued on page 8.)

MAXIMUM ALLOWABLE
DIFFERENCE mm (in.)
A-B
13 (0.5)

B-C
25 (1.0)

A-C
25 (1.0)

Fig. 3 — Unit Leveling Tolerances

DRAIN PLUG

NOTE: Drain plug is shown in factory-installed position.

Fig. 4 — Condensate Drain Pan

NOTES:
1. Dimension in ( ) is in millimeters.
2. Hook rigging shackles through holes in base rail as shown in
detail ‘‘A.’’ Holes in base rails are centered around the unit center of gravity. Use wooden top skid when rigging to prevent rigging straps from damaging unit.
3. Weights include base unit without economizer. See Tables 1A
and 1B for economizer weights.

UNIT
48TF
D/E/F008
D/E/F012
D/E014

All panels must be in place when rigging.

Fig. 5 — Rigging Details
4

MAX
WEIGHT
lb
870
1035
1050

kg
395
469
476

DIMENSIONS
‘‘A’’
‘‘B’’
‘‘C’’
in. mm in. mm in. mm
87.38 2219 40.25 1022 41.31 1050
87.38 2219 40.25 1022 49.31 1253
87.38 2219 40.25 1022 49.31 1253

Table 1A — Physical Data (SI)
UNIT SIZE 48TF
Low Heat (D), Medium Heat (E), High Heat (F)
NOMINAL CAPACITY (kW)
OPERATING WEIGHT (kg)
Unit
Durablade Economizer
EconoMi$er
Roof Curb*
COMPRESSOR TYPE
Quantity
Oil (ml)
REFRIGERANT TYPE
Operating Charge (kg)
Circuit 1
Circuit 2
CONDENSER COIL
Rows...Fins/m
Total Face Area (sq m)
CONDENSER FAN
Nominal L/s
Quantity...Diameter (mm)
Motor BkW...r/s
EVAPORATOR COIL
Rows...Fins/m
Total Face Area (sq m)
EVAPORATOR FAN
Quantity...Size (mm x mm)
Type Drive
Nominal L/s
Motor kW
Maximum Continuous BkW
Motor Frame Size
Fan r/s Range
Motor Bearing Type
Maximum Allowable r/s
Motor Pulley Pitch Diameter Min/Max (mm)
Nominal Motor Shaft Diameter (mm)
Fan Pulley Pitch Diameter (mm)
Nominal Fan Shaft Diameter (mm)
Belt, Quantity...Type...Length (mm)
Pulley Center Line Distance (mm)
Speed Change per Full Turn of
Movable Pulley Flange (r/s)
Movable Pulley Maximum Full Turns
From Closed Position
Factory Setting
Factory Speed Setting (r/s)
Fan Shaft Diameter at Pulley (mm)
FURNACE SECTION
Rollout Switch Cutout Temp (C)
Burner Orifice Diameter (mm)
Natural Gas
— Std
Liquid Propane — Alt
Thermostat Heat Anticipator Setting (amps)
400 v Stage 1
Stage 2
Gas Input (kW)
Stage 1
Stage 2
Efficiency (Steady State) (%)
Temperature Rise Range (C)
Manifold Pressure (kPa)
Natural Gas
— Std
Liquid Propane — Alt
Field Gas Connection Size (mm)
HIGH-PRESSURE SWITCH (kPa)
Standard Compressor
Internal Relief (Differential)
Cutout
Reset (Auto.)
LOW-PRESSURE SWITCH (kPa)
Cutout
Reset (Auto.)
FREEZE PROTECTION THERMOSTAT
Opens (C)
Closes (C)
OUTDOOR-AIR INLET SCREENS

D

008
E
21.5

F

395
20
28
65
Hermetic
2
1479 ea

Bhp —
BkW —

014
F

D

E
35.9

469
20
28
65
Hermetic
2
1479 ea
R-22

476
20
28
65
Scroll
2
1597 ea

2.10
2.22

3.08
3.49
3.22
3.49
Enhanced Copper Tubes, Aluminum Lanced Fins
1...669
2...669
2...669
1.90
1.92
2.30
Propeller Type
2880
3050
3050
2...559
2...559
2...559
.19...15.5
.19...15.5
.19...15.5
Enhanced Copper Tubes, Aluminum Double-Wavy Fins, Acutrol™ Feed Device
3...590
3...590
4...590
0.74
0.93
1.03
Centrifugal Type
1...381 x 381
1...381 x 381
1...381 x 381
Belt
Belt
Belt
1230
1700
1980
1.12
1.50
2.24
1.79
1.79
2.76
56
56
56
8.2-11.7
9.5-13.0
12.0-15.0
Ball
Ball
Ball
26.7
26.7
26.7
61/86
71/97
102/127
16
16
22
178
178
203
25
25
25
1...A...1245
1...A...1245
1...A...1346
425-489
403-445
403-445
.70
.70
.60
5
5
8.2
25

5
5
9.5
25

90.6

.14
.14
21.1
31.4

5
5
12.0
25

90.6

3.05
2.44
.14
.20
39.8
59.8

90.6

3.05
2.44

3.05
2.44

31.9
50.4

4-21

7-24

19

19

–6-10

.14
.20
31.9
50.4
80
2-18

7-24

2-18

.14
.20
39.8
59.8
80
7-24

13

8.3
8.3
19

19

19

8.3
8.3
19

3103 ± 345

3.28
2.59

3.05
2.44

3.28
2.59
.14
.20

43.9
65.6

39.8
59.8

43.9
65.6
80
4-21
8.3
8.3
19

3448 ± 345
2951
2206
48 ± 21
152 ± 48

Quantity...Size (mm)
RETURN-AIR FILTERS
Quantity...Size (mm)

012
E
29.2

D

4...406 x 508 x 51

LEGEND
Brake Horsepower
Fan Input Watts x Motor Efficiency

–1 ± 3
7±3
Cleanable
1...508 x 635 x 25
1...406 x 635 x 25
Throwaway
4...508 x 508 x 51

4...508 x 508 x 51

*Weight of 356 mm (14-in.) roof curb.
NOTE: The 48TF units have a loss-of-charge (low pressure) switch located in
the liquid line.

5

Table 1B — Physical Data (English)
UNIT SIZE 48TF
Low Heat (D), Medium Heat (E), High Heat (F)
NOMINAL CAPACITY (tons)
OPERATING WEIGHT (lb)
Unit
Durablade Economizer
EconoMi$er
Roof Curb*
COMPRESSOR TYPE
Quantity
Oil (oz)
REFRIGERANT TYPE
Operating Charge (lb-oz)
Circuit 1
Circuit 2
CONDENSER COIL
Rows...Fins/in.
Total Face Area (sq ft)
CONDENSER FAN
Nominal Cfm
Quantity...Diameter (in.)
Motor BkW...Rpm
EVAPORATOR COIL
Rows...Fins/in.
Total Face Area (sq ft)
EVAPORATOR FAN
Quantity...Size (in.)
Type Drive
Nominal Cfm
Motor Hp
Maximum Continuous Bhp
Motor Frame Size
Fan Rpm Range
Motor Bearing Type
Maximum Allowable Rpm
Motor Pulley Pitch Diameter Min/Max (in.)
Nominal Motor Shaft Diameter (in.)
Fan Pulley Pitch Diameter (in.)
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 Setting
Factory Speed Setting (rpm)
Fan Shaft Diameter at Pulley (in.)
FURNACE SECTION
Rollout Switch Cutout Temp (F)
Burner Orifice Diameter (in. ...drill size)
Natural Gas
— Std
Liquid Propane — Alt
Thermostat Heat Anticipator Setting (amps)
400 v Stage 1
Stage 2
Gas Input (Btuh) Stage 1
‘
Efficiency (Steady State) (%)
Temperature Rise Range (F)
Manifold Pressure (in. wg)
Natural Gas
— Std
Liquid Propane — Alt
Field Gas Connection Size (in.)
HIGH-PRESSURE SWITCH (psig)
Standard Compressor
Internal Relief (Differential)
Cutout
Reset (Auto.)
LOW-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
FREEZE PROTECTION THERMOSTAT
Opens (F)
Closes (F)
OUTDOOR-AIR INLET SCREENS

D

008
E
6.1

F

870
44
62
143
Hermetic
2
50 ea

Bhp —
BkW —

014
F

D

E
10.2

1035
44
62
143
Hermetic
2
50 ea
R-22

1050
44
62
143
Scroll
2
54 ea

4-10
4-11

6-13
7-11
7- 2
7- 8
Enhanced Copper Tubes, Aluminum Lanced Fins
1...17
2...17
2...17
20.50
20.50
25.00
Propeller Type
6100
6500
6500
2...22
2...22
2...22
1/4...930
1/4...930
1/4...930
Enhanced Copper Tubes, Aluminum Double-Wavy Fins, Acutrol™ Feed Device
3...15
3...15
4...15
8.0
10.0
11.1
Centrifugal Type
1...15 x 15
1...15 x 15
1...15 x 15
Belt
Belt
Belt
2600
3500
4200
1
2
3
1 /2
2.40
2.40
3.70
56
56
56
492-700
571-779
717-900
Ball
Ball
Ball
1600
1600
1600
2.4/3.4
2.8/3.8
4.0/5.0
5/8
5/8
7/8
7.0
7.0
8.0
—
—
—
1...A...49
1...A...49
1...A...53
16.75-19.25
15.85-17.50
15.85-17.50
41
41
36
5
5
492
1

5
5
571
1

195

.14
.14
72,000
107,000
20-50

.14
.20
109,000
172,000
80
35-65

1/2

3.5
3.5
3/4

5
5
717
1

195

.120...31
.096...41
.14
.20
136,000
204,000
45-75

.120...31
.096...41

.120...31
.096...41

109,000
172,000

.14
.20
136,000
204,000
80
45-75

35-65

3.5
3.5
3/4

3/4

450 ± 50

195
.129...30
.102...38

.120...31
.096...41

.129...30
.102...38
.14
.20

150,000
224,000

136,000
204,000

150,000
224,000
80

40-70

45-75

40-70
3.5
3.5
3/4

500 ± 50
428
320
7±3
22 ± 7

Quantity...Size (in.)
RETURN-AIR FILTERS
Quantity...Size (in.)

012
E
8.3

D

4...16 x 20 x 2

LEGEND
Brake Horsepower
Fan Input Watts x Motor Efficiency

30 ± 5
45 ± 5
Cleanable
1...20 x 25 x 1
1...16 x 25 x 1
Throwaway
4...20 x 20 x 2

4...20 x 20 x 2

*Weight of 356 mm (14-in.) roof curb.
NOTE: The 48TF units have a loss-of-charge (low pressure) switch located in
the liquid line.

6

STANDARD
UNIT WEIGHT

UNIT
48TF
D/E/F008
D/E/F012
D/E014

Lb
870
1035
1050

Kg
395
469
476

DURABLADE
ECONOMIZER
WEIGHT
Lb
Kg
44
20
44
20
44
20

ECONOMI$ER
CORNER
CORNER
CORNER
CORNER
WEIGHT
WEIGHT (A) WEIGHT (B) WEIGHT (C) WEIGHT (D)
Lb
62
62
62

Kg
28
28
28

NOTES:
1. Dimensions in [ ] are in millimeters.
2.
3.

Center of gravity.
Direction of airflow.

4. On vertical discharge units, ductwork to be attached to
accessory roof curb only. For horizontal discharge units,
field-supplied flanges should be attached to horizontal discharge openings, and all ductwork should be attached to
the flanges.
5. Minimum clearance (local codes or jurisdiction may prevail):
a. Between unit, flue side and combustible surfaces,
36 in. [914].
b. Bottom of unit to combustible surfaces (when not using
curb), 1 in. [25]. Bottom of base rail to combustible surfaces (when not using curb) 0 inches.
c. Condenser coil, for proper airflow, 36 in. [914] one side,
12 in. [304] the other. The side getting the greater clearance is optional.
d. Overhead, 60 in. [1624] to assure proper condenser fan
operation.
e. Between units, control box side, 42 in. [1067] per NEC
(National Electrical Code).
f. Between unit and ungrounded surfaces, control box
side, 36 in. [914] per NEC.
g. Between unit and block or concrete walls and other
grounded surfaces, control box side, 42 in. [1067] per
NEC.
h. Horizontal supply and return end, 0 inches.
6. With the exception of the clearance for the condenser coil
and combustion side as stated in notes 5a, b and c, a
removable fence or barricade requires no clearance.
7. Units may be installed on combustible floors made from
wood or Class A, B, or C roof covering material if set on
base rail.
8. The vertical center of gravity is 1′-7″ [483] for 008, 1′-11″
[584] for 012 and 014 up from the bottom of the base rail.

Lb
189
225
228

Kg
86
102
103

Lb
161
192
195

Kg
73
87
88

Lb
239
285
289

Kg
109
129
131

Lb
280
333
338

Kg
127
151
153

“H”

F
G

13/8″ Dia [35] Field Power Supply Hole
21/2″ Dia [64] Power Supply Knockout
13/4″ Dia [44] Charging Port Hole
7/ ″ Dia [22] Field Control Wiring Hole
8
3/ ″ [19] - 14 NPT Condensate Drain
4
1/ ″ [13] - 14 NPT Gas Connection 48TFD008
2
3/ ″ [19] - 14 NPT Gas Connection 48TFE,F008
4
48TFD,E012 & 014, 48TJF012
2″″ Dia [51] Power Supply Knockout

Fig. 6 — Base Unit Dimensions
7

“K”

ft-in. [mm] ft-in. [mm]
ft-in.
1-27/8 [ 378] 3-55/16 [1050] 2-911/16
2-57/8 [ 759] 4-15/16 [1253] 3-03/8
1-27/8 [ 378] 4-15/16 [1253] 3-03/8

CONNECTION SIZES
A
B
C
D
E

“J”

“L”
[mm] ft-in.
[856] 2- 27/16
[924] 2-107/16
[924] 2-107/16

[mm]
[672]
[875]
[875]

BOTTOM POWER CHART, THESE HOLES
REQUIRED FOR USE WITH ACCESSORY
PACKAGES — CRBTMPWR002A00 (POWER
AND CONTROL) AND CRBTMPWR004A00
(POWER, CONTROL, AND GAS)
THREADED
CONDUIT
SIZE
1/ ″ [12.7]
2
1
1 /4″ [31.7]
3/ ″ [19] FPT
4

WIRE
USE
24 V
Power
Gas

REQURED
HOLE SIZES
(MAX.)
7/ ″ [22.2]
8
3
1 /4″ [44.4]
15/8″ [41.3]

Step 5 — Install Flue Hood — Flue hood is shipped
screwed to the burner compartment access panel. Remove
from shipping location and, using screws provided, install flue
hood and screen in location shown in Fig. 7.

Step 6 — Install Gas Piping — Unit is equipped for
use with type of gas shown on nameplate. Refer to local
building codes.
For natural gas applications, gas pressure at unit gas connection must not be less than 13.5 kPa (4.0 in. wg) (17.0 kPa
[5.0 in. wg] in high heat units) or greater than 44.0 kPa
(13.0 in. wg) while unit is operating. For liquid propane applications, the gas pressure must not be less than 17.0 kPa (5.0 in. wg)
or greater than 44.0 kPa (13.0 in. wg) at the unit connection.
Size gas supply piping for 1.7 kPa (0.5 in. wg) maximum
pressure drop. Do not use supply pipe smaller than unit gas
connection.
NOTE: When installing gas piping to gas valve inlet, use properly sized back-up wrench on inlet flange flats.
Support gas piping as shown in the table in Fig. 8. For example, a 19 mm (3/4-in.) gas pipe must have one fieldfabricated support beam every 2.4 m (8 ft).
See Fig. 8 for typical pipe guide and locations of external
manual gas shutoff valve.

Fig. 7 — Flue Hood Details

BASE UNIT

Step 7 — Make Electrical Connections

X
228 mm (9") MINIMUM CLEARANCE
FOR PANELREMOVAL
GAS
REGULATOR*
MANUAL GAS
SHUTOFF VALVE*

1219 mm (48") MINIMUM

DRIP LEG PER NFGC*
BASE RAIL

Unit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if
an electrical fault should occur. This ground may consist of
electrical wire connected to unit ground lug in control compartment, or conduit approved for electrical ground when
installed in accordance with NEC (National Electrical
Code), ANSI/NFPA (National Fire Protection Association), latest edition (U.S.A. Standards), and local electrical
codes. Do not use gas piping as an electrical ground. Failure to follow this warning could result in the installer being
liable for personal injury of others.

ROOF CURB

FIELD-FABRICATED
SUPPORT*

FROM GAS METER

LEGEND
NFGC — National Fuel Gas Code (U.S.A. Standard)
*Field supplied.
NOTE: Follow all local codes.

SPACING OF SUPPORTS
STEEL PIPE NOMINAL DIAMETER
mm (in.)
13 (1/2)
19 or 25 (3/4 or 1)
32 or larger (11/4 or larger)

FIELD POWER SUPPLY — All units are factory wired for
the voltage shown on the nameplate.
Refer to unit label diagram for additional information. Pigtails are provided for field service.
When installing units, provide a disconnect per local codes.
Use copper conductors only when splice connectors are used.
All field wiring must comply with local requirements.
Install conduit through side panel openings indicated in
Fig. 6. Route power lines through connector to terminal connections as shown in Fig. 9.
Voltages between phases must be balanced within 2% and
the current within 10%. Use the formula shown in Table 2,
Note 2 to determine the percentage of voltage imbalance. Operation on improper line voltage or excessive phase imbalance
constitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier
warranty.
NOTE: If field-installed thru-the-bottom connections are used,
refer to the accessory installation instructions for power wiring.
Refer to Fig. 6 for drilling holes in basepan.

X DIMENSION
m (ft)
1.8 (6)
2.4 (8)
3.0 (10)

Fig. 8 — Gas Piping Guide (With Accessory
Thru-the-Curb Service Connections)
FIELD CONTROL WIRING — Install a Carrier-approved
accessory thermostat assembly according to installation instructions included with the accessory. Locate thermostat
assembly on a solid wall in the conditioned space to sense average temperature in accordance with thermostat installation
instructions.
NOTE: For wire runs up to 15 m (50 ft), use no. 18 AWG
(American Wire Gage) insulated wire (35 C minimum). For 15
to 23 m (51 to 75 ft), use no. 16 AWG insulated wire (35 C
minimum). For over 23 m (75 ft), use no. 14 AWG insulated
wire (35 C minimum). All wire larger than no. 18 AWG cannot
be directly connected to the thermostat and will require a junction box and splice at the thermostat. Refer to Table 3 for wire
conversions.

8

Table 2 — Electrical Data
UNIT
48TF
008
012
014

FLA
HACR
IFM
LRA
MCA
MOCP
NEC
OFM
RLA

—
—
—
—
—
—
—
—
—

NOMINAL
VOLTAGE
(50 Hz)
400
(3 phase)
400
(3 phase)
400
(3 phase)

VOLTAGE
RANGE
Min
Max

COMPR
(ea)
RLA
LRA

OFM
(ea)
FLA

IFM

MINIMUM UNIT
DISCONNECT
FLA
LRA

POWER SUPPLY

FLA

MCA

MOCP*

360

440

6.4

42.0

0.3

2.6

17.6

20

18

108

360

440

8.9

52.0

0.3

2.6

23.2

30

24

128

360

440

10.4

73.0

0.7

5.4

29.4

35

31

192

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 (U.S.A.)
Outdoor (Condenser) Fan Motor
Rated Load Amps

Example: Supply voltage is 400-3-50.
AB = 393 v
BC = 403 v
AC = 396 v
Average Voltage =
=

*Fuse or HACR circuit breaker.

393 + 403 + 396
3
1192
3

= 397
Determine maximum deviation from average voltage.
(AB) 397 – 393 = 4 v
(BC) 403 – 397 = 6 v
(AC) 397 – 396 = 1 v
Maximum deviation is 6 v.
Determine percent of voltage imbalance.
6
% Voltage Imbalance = 100 x
397

NOTES:
1. In compliance with NEC requirements (U.S.A. Standard) 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.
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

= 1.5%
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.

Table 3 — American/European Wire Conversions

Route thermostat cable or equivalent single leads of colored
wire from thermostat subbase terminals to low-voltage connections on unit (shown in Fig. 10) as described in Steps 1-4
below.
1. If unit is mounted on roof curb and accessory thru-thecurb service plate connection is used, route wire through
connection plate.
2. Pass control wires through the hole provided on unit (see
connection D in Connection Sizes table in Fig. 6).
3. Feed wires through the raceway built into the corner post
to the 24-v barrier located on the left side of the control
box. See Fig. 11. The raceway provides the UL-required
(Underwriters’ Laboratories) clearance between highand low-voltage wiring.
4. Connect thermostat wires to screw terminals on lowvoltage connection board.
HEAT ANTICIPATOR SETTINGS — Set heat anticipator
settings at .14 amp for the first stage and .20 amp for secondstage heating, except for 008 low heat. Set both first and second stage heat anticipator settings for 008 at .14 amp.

AMERICAN
Industry
Standard Size
18 AWG
16 AWG
14 AWG
12 AWG
10 AWG
8 AWG
6 AWG
4 AWG
3 AWG
2 AWG
1 AWG
1/0 AWG
2/0 AWG
3/0 AWG
4/0 AWG
250 kcmil
300 kcmil
350 kcmil
400 kcmil
500 kcmil
600 kcmil

American
Conversion
Size (mm2)
0.82
1.30
2.08
3.30
5.25
6.36
13.29
21.14
26.65
33.61
42.39
53.49
67.42
85.00
107.19
126.64
151.97
177.90
202.63
253.29
303.95

LEGEND
AWG — American Wire Gage
kcmil — Thousand Circular Mils

9

EUROPEAN
Industry
Standard
Size (mm2)
1.0
1.5
2.5
4.0
6.0
10.0
16.0
25.0
—
35.0
50.0
—
70.0
95.0
120.0
150.0
—
185.0
240.0
300.0
—

C
IFC
NEC

LEGEND
— Contactor
— Indoor (Evaporator)
Fan Contactor
— National Electrical Code
(U.S.A. Standard)
Splice Connection
(Factory Supplied)
Equipment Ground
Field Wiring
Factory Wiring

Fig. 9 — Power Wiring Connections

UNIT LOW VOLTAGE
CONNECTION
BOARD

INTEGRATED
GAS UNIT
CONTROLLER
(IGC)

LEGEND
AHA — Adjustable Heat Anticipator
CC — Cooling Compensator
Field Wiring
Factory Wiring

Fig. 10 — Low-Voltage Connections

RACEWAY

COMPRESSOR
NO. 2

COMPRESSOR
NO.1

Fig. 11 — Field Control Wiring Raceway
and Compressor Location

10

Step 8 — Adjust Factory-Installed Options

9. Remove and save screws currently on sides of hood.
Insert screens. Secure screens to hood using the screws.
See Fig. 15.

APOLLO CONTROL — The optional Apollo control is used
to actively monitor all modes of operation as well as indoor
(evaporator) fan status, filter status, and indoor-air quality. The
Apollo control is designed to work with Carrier TEMP and
VVT® systems.
The thermostat must be wired to the Apollo control before
starting the unit. Refer to the Apollo control installation
instructions for information on installing the thermostat. See
Fig. 12 for Apollo location.
MANUAL OUTDOOR-AIR DAMPER — The outdoor-air
hood and screen are attached to the basepan at the bottom of
the unit for shipping.
Assembly:
1. Determine quantity of ventilation required for building.
Record amount for use in Step 8.
2. Remove and save evaporator coil access panel and
screws. See Fig. 13.
3. Separate hood and screen from basepan by removing the
screws and brackets securing them. Save all screws and
discard brackets.
4. Replace evaporator coil access panel using screws from
Step 2.
5. Place hood on front of evaporator coil access panel. See
Fig. 14 for hood details. Secure top of hood with the
screws removed in Step 3. See Fig. 15.
6. Remove and save 6 screws (3 on each side) from sides of
the manual outdoor-air damper. Remove and save 2 manual outdoor-air adjustment screws (one on each side of
damper blade).
7. Align screw holes on hood with screw holes on side of
manual outdoor-air damper. See Fig. 14 and 15. Secure
hood with 6 side screws from Step 6.
8. Adjust minimum position setting of the damper blade by
adjusting the 2 manual outdoor-air adjustment screws on
the front of the damper blade. See Fig. 13. Slide blade
vertically until it is in the appropriate position determined
by Fig. 16. Tighten screws.
WIRING TO
THERMOSTAT

APOLLO
CONTROL

Fig. 13 — Damper Panel with Manual
Outdoor-Air Damper Installed

CONTROL
WIRING

Fig. 14 — Outdoor-Air Hood Details

Fig. 12 — Apollo Control Factory-Installed
in Typical Unit

Fig. 15 — Damper with Hood Attached
11

50

0

0.6
m

)

)

1
(5
2"

0.4

m

m

PE
N
m
m
)O

100

0.8

3"

6
(7

m

m)

1"
(2
5

150

NEGATIVE PRESSURE (in. wg)

NEGATIVE PRESSURE (Pa)

200

c. Install horizontal discharge block-off plate over
the opening on the access panel. (Block-off plate
MUST be installed before installing hood assembly.) See Fig. 22.
7. Insert economizer plug into economizer harness. Remove
tape from barometric relief damper. See Fig. 20.
8. If ventilation air is not required, proceed to Step 9. If ventilation air is required, determine the minimum position
setting for required airflow. See Fig. 23. Adjust minimum
position setting by loosening the screws on the position
setting bracket. See Fig. 24. Slide bracket until the top
screw is in the position determined by Fig. 23. Tighten
screws.
9. Remove tape from outdoor-air thermostat (OAT). Fasten
OAT to inside of hood using screws and speed clips provided. See Fig. 25. Make sure OAT terminals are positioned up.
10. Replace outdoor-air opening panel using screws from
Step 2. Replace filter access panel. Ensure the filter access panel slides along the tracks and is securely engaged.
11. Fasten hood top and side plate assembly to outdoor-air
opening panel with screws provided.
12. Place knob supplied with economizer on OAT. See
Fig. 25. Set OAT for 1.7° C (3° F) below indoor room
thermostat setting. If accessory enthalpy control (EC) is
used in place of OAT, see instructions shipped with EC
for installation and adjustment. See Fig. 25.
13. Connect OAT per Fig. 26.
14. Slide outdoor-air inlet screens into screen track on hood
side plate. While holding screens in place, fasten screen
retainer to hood using screws provided.
NOTE: Refer to Fig. 27 for Durablade economizer barometric
relief damper characteristics.

1.0

250

2m

11
"(

4.4

0.2

0

2

0

100

6
8
4
OUTDOOR AIRFLOW (cfm x 100)
300
200
400
OUTDOOR AIRFLOW (L/s)

10

12
500

Fig. 16 — Position Setting

OPTIONAL DURABLADE ECONOMIZER — The optional economizer hood assembly is packaged and shipped in the filter section. Damper blades and control boards are installed at the
factory and the economizer is shipped in the vertical discharge
position.
NOTE: Horizontal discharge block-off plate is shipped with
the air hood package. If unit is to be used for vertical discharge
application, discard this plate.
Assembly
1. Determine if ventilation air is required in building. If so,
determine the minimum amount to be supplied by each
unit and record quantity of ventilation air needed for use
in Step 8.
2. Remove filter access panel by raising panel and swinging
panel outward. Panel is now disengaged from track and
can be removed. No tools are required to remove filter access panel. Remove outdoor-air opening panel. Save panels and screws. See Fig. 17. Remove optional economizer
and outdoor-air damper hood package from filter section.
3. Assemble outdoor-air hood top and side plates as shown
in Fig. 18. Install seal strips on hood top and sides. Put
aside screen retainer and retainer screw for later assembly. Do not attach hood to unit at this time.
4. On 012 and 014 units, install vertical discharge block-off
plate on right side over return air duct opening. See
Fig. 19.
5. a. Slide economizer into unit and secure with screws.
See Fig. 20.
NOTE: Be sure to engage rear economizer flange under tabs at
rear of vertical return-air opening.
b. Remove screw and discard from barometric relief
damper. See Fig. 20.
6. To convert to horizontal discharge application:
a. Rotate the economizer 90 degrees until the economizer motor faces the condenser section (see
Fig. 21).
b. Rotate the barometric relief damper hinge
90 degrees. Barometric relief damper should open
vertically to operate properly.

OUTDOOR-AIR
OPENING PANEL

FILTER ACCESS
PANEL

Fig. 17 — Access Panel Locations

12

ECONOMIZER
CONTROL BOARD

ECONOMIZER
PLUG

ECONOMIZER
MOTOR

TOP
SCREW

SHIPPING
SCREW

Fig. 20 — Durablade Economizer Installed in Unit
ECONOMIZER CONTROL BOARD

ECONOMIZER MOTOR

Fig. 18 — Outdoor-Air Hood Details

POSITION SETTING BRACKET

Fig. 21 — Horizontal Durablade Economizer
Installation (90 Degree Rotation)

Fig. 19 — Vertical Discharge Block-Off Plate
(48TF012, 014 Units Only)

BLOCK-OFF PLATE

Fig. 22 — Horizontal Discharge Block-Off Plate
13

Example:
Given —
Negative Pressure . . . . . . . . . . . . . . . . . . . . . . . . . 25 Pa (0.1 in. wg)
Outdoor Airflow . . .. . . . . . . . . . . . . . . . . . . . . . . . 520 L/s (1100 cfm)
Determine —
Setting = 150 mm (6 in.)

OAT
(TERMINALS ARE UP)

TOP

Fig. 23 — Durablade Economizer Damper Minimum
Position Setting

UNIT

0

OUTSIDE AIR
SCREEN

2

1

ENTHALPY
CONTROL

REV. B

B

TR

C

24VAC

2

TR1

1

3 mA MIN. AT 11 VDC

B A

ENTHALPY CONTROL

3

D

CW–SETPOINTS–CCW

3
4
5

198818A

RUSH AT 24VAC

CONTACTS SHOWN IN HIGH ENTHALPY
OR UNPOWERED STATE

°F

CONTACT RATINGS: 1.5A RUN, 3.5A IN

OUTDOOR TEMP.

% 90
H
DAMPER
U 70
CLOSED
M
I 60
DAMPER
D
OPEN
I 30
T
Y 10
50 55 60 65 70 75 80 85

6

SO

D

TR

S

4

2

5

3

P1

T1

1

P

T

7

C

MINIMUM
POSITION

OPEN

HOOD

97-3672

9

8

REV.

Fig. 25 — Outdoor-Air Thermostat/
Enthalpy Control Installation

Fig. 24 — Durablade Economizer Minimum
Position Damper Setting

14

CONTROLLER

ECONOMI$ER
PLUG
ACTUATOR

0.70

150

0.60

125

100

75

PRESSURE DROP (in. wg)

PRESSURE DROP (Pa)

Fig. 26 — Wiring Connections for
Outdoor-Air Thermostat
175

GEAR-DRIVEN
DAMPER

OUTDOOR AIR
TEMPERATURE
SENSOR

0.50

BAROMETRIC
RELIEF DAMPERS

0.40

Fig. 28 — EconoMi$er Component Locations
0.30

50

0.20

25

0.10

0
0.00

200

0

100

400

200

600
CFM
300
L/s

800

1000

400

1200

500 570

Fig. 27 — Durablade Economizer Barometric Relief
Damper Characteristics
OPTIONAL ECONOMI$ER — See Fig. 28 for EconoMi$er
component locations.
1. To remove the existing unit filter access panel, raise the
panel and swing the bottom outward. The panel is now
disengaged from the track and can be removed. Remove
the indoor coil access panel and discard. See Fig. 29.
NOTE: If installing an optional Power Exhaust Assembly,
refer to the EconoMi$er Power Exhaust Installation Instructions, then proceed to Step 6. Controller should be mounted in
vertical position as shown in Fig. 28.
2. To assemble the hood assembly remove the EconoMi$er
hood from its packaging. Locate the outdoor air opening
panel. See Fig. 30.
3. Install the 19 mm x 19 mm (3/4 x 3/4-in.) seal strip on the
exhaust air hood top panel. Install the 3 mm x 22 mm
(1/8 x 7/8-in.) seal strip on the exhaust air hood side panels
and bottom brackets. Assemble the exhaust air hood to
the outdoor air opening panel as shown in Fig. 30, using
the screws provided. Do not attach hood assembly to unit
at this time.
4. Install the 3 mm x 22 mm (1/8 x 7/8-in. seal strip on the
outdoor air hood top and side panels. Assemble the outdoor air hood to the outdoor air opening panel as shown
in Fig. 31, using the screws provided. Do not attach completed hood (Fig. 32) assembly to the unit at this time.

OUTDOOR-AIR
OPENING PANEL

FILTER ACCESS
PANEL

Fig. 29 — Typical Access Panel Locations
OUTDOOR AIR
OPENING PANEL

EXHAUST AIR
HOOD TOP
SCREEN
RETAINER

SEAL STRIP

EXHAUST AIR
HOOD SIDES

EXHAUST AIR SCREEN
EXHAUST AIR
BOTTOM BRACKET

Fig. 30 — Exhaust Air Hood Assembly

15

OUTDOOR AIR
OPENING
PANEL

SEAL STRIP

OUTDOOR AIR
HOOD TOP

BLOWER
SCREEN
RETAINER
SEAL STRIP

OUTDOOR AIR
INLET
SCREENS

INSTALL
RETURN AIR
BLOCK-OFF
PLATE

ASSEMBLED
EXHAUST HOOD

FILTER

OUTDOOR AIR
HOOD SIDES

Fig. 31 — Outdoor Air Hood Assembly
REMOVE FACTORY INSTALLED
BLOCK-OFF PLATE
(008 AND 012 UNITS ONLY)

Fig. 33 — Return Air Block-Off Plate Installation
(48TF014 Units Only)

UNIT FILTER
RACK

ECONOMIZER CLIP
HVAC UNIT

ECONOMIZER
UNIT BASE

Fig. 32 — Completed Hood Assembly
ECONOMIZER REAR
FLANGE

Fig. 34 — Rear EconoMi$er Flange Installation
5. Slide the outdoor air inlet screens into the screen track on
the hood side panels. While holding the screens in place,
fasten the screen retainer to the hood using the screws
provided. Repeat the process for the barometric exhaust
air screen. Do not attach hood assembly to unit at this
time.
6. For 48TF014 units, install the return air block-off plate
over the return air duct opening. See Fig. 33.
NOTE: For 48TF008 and 012 units, remove the factoryinstalled block-off plate. See Fig. 33.
7. Slide the EconoMi$er assembly into the rooftop unit. See
Fig. 34 and 35.
NOTE: Be sure to engage rear EconoMi$er flange under tabs in
return air opening of the unit base. See Fig. 34.
8. Install the outdoor air block-off plate, then secure the
EconoMi$er with the screws provided. See Fig. 35.
9. Remove and store the 12-pin jumper plug from the unit
wiring harness located in the upper left corner and insert
the EconoMi$er plug into the unit wiring harness. Refer
to wiring diagram Fig. 36 and 37. Also refer to Fig. 38 if
installing an accessory power exhaust.
10. Install the complete hood assembly on the unit and secure
using the screws provided.
11. Remove the indoor fan motor access panel.
12. Mount the supply air temperature sensor to the lower left
portion of the indoor blower housing with the two (2)
screws provided (see Fig. 39). Connect the violet and
pink wires to the corresponding connections on the supply air temperature sensor. Replace the indoor fan motor
access panel.

WIRING HARNESS

OUTDOOR AIR
BLOCK-OFF PLATE

Fig. 35 — EconoMi$er Installed in
48TF008 and 012 Units

16

OAT

LEGEND
— Outdoor-Air Thermostat

Fig. 36 — EconoMi$er Wiring

BROWN

ECONOMI$ER
CONTROLLER

VIOLET

OAT
WHITE
RED

COM
OAH
+15 V
RAT
COM
RAH
+15 V
CO2 (+)
CO2 COM
DAT
COM
REM POT
COM
LED
COM

BROWN
VIOLET
WHITE
RED

TEMP
TEMP
COM
OUT
PWR

OUTDOOR
AIR
SENSOR

TEMP
TEMP
COM
OUT
PWR

RETURN
AIR
SENSOR

CO2 SENSOR
24
V+
COM VAC
SUPPLY AIR
TEMPERATURE SENSOR
PINK
TEMP
VIOLET
TEMP

Fig. 37 — EconoMi$er Sensor Wiring
17

TO FUSED
DISCONNECT

HT01AH850
(460 VAC)

RED YEL BLU GRAY
H1

H3 H2

H4

X4

X2 X3

X1

SECONDARY
230VAC

FIELD SUPPLIED
WIRING

BLACK
BLACK
LT. BLUE
BROWN

FAN 1

C1
GREEN/
YELLOW
4-PIN
CONNECTOR
PLUG

2 x 4 IN.
HANDY BOX
BLACK L1

1

BLUE
L2 2
GREEN GND

3
4

3

6

9

2

5

8

1

4

7

B

BLACK

R1
24 VAC
A

BLUE

L1

1
L2
2
GND
3
4

230 VAC
1 PHASE

3-PIN
CONNECTOR
PLUG

ORANGE

1

YELLOW

2

BROWN
BLACK
BLACK

BLUE

LT. BLUE

GREEN

BROWN

FAN 2

3

6

9

2

5

8

1

4

7

C1
GREEN/
YELLOW

BLUE

Fig. 38 — Wiring Diagram for Power Exhaust System

SUPPLY AIR
TEMPERATURE
SENSOR
MOUNTING
LOCATION

SUPPLY AIR
TEMPERATURE
SENSOR

Fig. 39 — Supply Air Sensor Placement
18

B

BLACK

R2
24 VAC

A

3

4. Calculate the minimum airflow across the EconoMi$er.
a. Calculate % of outside air using the following
formula.
% Outdoor air through EconoMi$er
Mixture Temp – Return Air Temp
% Outdoor air =
Outdoor Temp – Return Air Temp

CO2 Control Set Up — If a CO2 sensor is not being used, proceed to the next section. If a CO2 sensor is being used, perform
the following:
1. Determine the value at which you want the minimum
position of the dampers to begin opening to allow a greater amount of outdoor air to enter. The range is 800 to
1,400 ppm.
2. Locate the CO2 SP (PPM) potentiometer and adjust to the
desired set point. See Fig. 40.
Mechanical Cooling Lockout — Determine the outdoor-air
temperature at which you want the mechanical cooling (compressors) to be disabled. Locate the mechanical cooling lockout
(MECH CLG LOCKOUT) potentiometer. To disable this feature, turn the potentiometer counterclockwise (CCW) to the
OFF position. Otherwise, set the value between –12 and 15 C
(10 and 60 F). Mechanical cooling will not operate when the
outdoor air temperature is below this value. See Fig. 40.
Dry Bulb Changeover Set Up — Determine the dry bulb
changeover set point from Table 4. The settings are A, B, C and
D. Locate the ECON SP potentiometer and set the dry bulb
changeover set point. See Fig. 40. When the OAT is above this
set point, the damper is limited to minimum position setting.

b. Multiply total CFM by percentage outdoor air, this
gives outdoor air volume in CFM.
5. Turn on base unit power.
NOTE: The EconoMi$er begins operation three minutes after power up.

Personal Injury Hazard. Avoid possible injury by keeping fingers away from damper blades.
6. See Fig. 41 for barometric relief damper characteristics.

Table 4 — Changeover Set Points
SETTINGS
Dry Bulb C (°F)
Single Enthalpy* KJ/Kg (Btu/lb)
Differential Temperature* C
(°F, Not Adjustable)
Differential Enthalpy* KJ/Kg
(Btu/lb, Not Adjustable)

A
23
(73)
63
(27)
1.1
(2)
2
(1)

B
21
(69)
58
(25)
1.1
(2)
2
(1)

C
19
(66)
56
(24)
1.1
(2)
2
(1)

D
17
(63)
51
(22)
1.1
(2)
2
(1)

Fig. 40 — EconoMi$er Control Adjustment
Potentiometers (Factory Settings)

If a potentiometer fails, its setting will default to the values
in Table 5.

PRESSURE DROP (Pa)

125

Table 5 — Default Potentiometer Settings
POTENTIOMETER
CO2 SP (PPM)
MECH CLG LOCKOUT, C (F)
ECON SP
MIN POS (%)

DEFAULT SETTING
1,000
8.3 (47)
D
20

Ventilation Air (Minimum Position Set Up) — If ventilation
air is not required, proceed to Step 5. If ventilation air is required, perform the following:
1. The indoor fan must be on to set the ventilation air. Either
put the thermostat in the continuous fan mode or jumper
the R and G terminals at the rooftop unit connection
board.
2. Locate the minimum position (MIN POS) potentiometer.
Turn the potentiometer full CCW to fully close the outdoor air dampers. Turn the potentiometer gradually
clockwise (CW) to the desired position. See Fig. 40.
3. Replace the filter access panel. See Fig. 21. Ensure the filter access panel slides along the tracks and is securely
engaged.

100
75
50
25
0

STATIC PRESSURE (IN.WG)

*Field-installed accessory.

0.5
0.4
0.3
0.2
0.1
0
0

400

0

200

800
1200 1600 2000
FLOW (CUBIC FEET/MINUTE)
400

600

800

1000

2400
1200

FLOW (L/s)

Fig. 41 — EconoMi$er Barometric Relief Capacity

19

Step 9 — Adjust Evaporator-Fan Speed — Adjust evaporator-fan speed to meet jobsite requirement.
Table 6 shows motor performance. Tables 7 and 8 show fan
rpm at motor pulley settings, Table 9 shows motor efficiencies
and Tables 10 and 11 give accessory static pressure drops. Refer to Tables 12-23 to determine fan speed settings. Fan motor
pulleys are factory set for speed shown in Table 1A or 1B.
To change fan speed:
1. Shut off unit power supply and install lockout tag.
2. Loosen belt by loosening fan motor mounting plate nuts
(see Fig. 42 and 43).
3. Loosen movable pulley flange setscrew (see Fig. 44).
4. Screw movable flange toward fixed flange to increase fan
speed and away from fixed flange to decrease fan speed.
Increasing fan speed increases load on motor. Do not exceed maximum speed specified in Table 1A or 1B.
5. Set movable flange at nearest flat of pulley hub and tighten setscrew (see Table 1A or 1B for speed change for
each full turn of pulley flange).
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.
To adjust belt tension (see Fig. 42 and 43):
1. Loosen fan motor mounting nuts.
2. Size 008 — Slide motor mounting plate away from fan
scroll for proper belt tension (13 mm [1/2-in.] deflection
with 3.6 to 4.5 kg [8 to 10 lbs] of force) and tighten
mounting nuts. See Fig. 42.
Sizes 012,014 — Slide motor mounting plate downward
to tighten belt tension (13 mm [1/2-in.] deflection with 2.3
to 4.5 kg [5 to 10 lbs] of force) and tighten mounting nuts.
See Fig. 43.
3. Adjust bolt and nut on mounting plate to secure motor in
fixed position. See Fig. 44.
Realign 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.

MOTOR MOUNTING
PLATE NUTS

Fig. 42 — Typical Belt-Drive Motor Mounting
for Size 008

Fig. 43 — Typical Belt-Drive Motor Mounting
for Sizes 012,014

Fig. 44 — Evaporator-Fan Pulley Adjustment

Table 6 — Evaporator-Fan Motor Performance
UNIT
48TF

UNIT RATED
VOLTAGE

008
012
014

400
400
400

MAXIMUM ACCEPTABLE
CONTINUOUS
BkW*
2.76
2.76
2.76

MAXIMUM ACCEPTABLE
CONTINUOUS
BHP*
2.90
3.70
3.70

LEGEND
BHP — Brake Horsepower
BkW — kW x Motor Efficiency

MAXIMUM ACCEPTABLE
OPERATING
WATTS
2615
3313
3313

MAXIMUM
AMP DRAW
3.6
5.0
5.0

*Extensive motor and electrical testing on these units ensures that
the full range of the motors can be utilized with confidence. Using
your fan motors up to the ratings shown in this table will not result in
nuisance tripping or premature motor failure. Unit warranty will not
be affected.

20

Table 7 — Fan R/s at Motor Pulley Settings (SI)
UNIT
48TF

0

1/

008
012
014

11.70
13.00
15.00

11.35
12.65
14.70

2

1

11/2

11.00
12.30
14.40

10.65
11.95
14.10

MOTOR PULLEY TURNS OPEN
2
21/2
3
10.30
11.60
13.80

9.95
11.25
13.50

9.60
10.90
13.20

31/2

4

41/2

5

9.25
10.55
12.90

8.90
10.20
12.60

8.55
9.85
12.30

8.20
9.50
12.00

31/2

4

41/2

5

555
634
771

534
613
753

513
592
735

492
571
717

Table 8 — Fan Rpm at Motor Pulley Settings (English)
UNIT
48TF

0

1/

008
012
014

700
779
900

681
760
883

2

1

11/2

660
739
865

639
718
843

MOTOR PULLEY TURNS OPEN
2
21/2
3
618
697
825

597
676
807

576
655
789

Table 9 — Evaporator-Fan Motor Efficiency
MOTOR
48TF
D/E/F008
D/E/F012
D/E014

EFFICIENCY (%)
80
80
85

NOTE: Convert watts to bhp using the following formula:
bhp =

watts input x motor efficiency
746

Table 10 — Accessory/FIOP Static Pressure Drop (Pa) — 48TF008-014
UNIT 48TF

RATED VOLTAGE

L/s

All

1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
2300

008-014

DURABLADE ECONOMIZER
PRESSURE DROP
5
6
7
8
9
10
11
12
13
14
15
16
17

ECONOMI$ER
—
—
—
31
35
41
50
59
67
75
84
90
97

FIOP — Factory-Installed Option

Table 11 — Accessory/FIOP Static Pressure Drop (in. wg) — 48TF008-014
UNIT 48TF

RATED VOLTAGE

CFM

All

2200
2500
3000
3500
4000
4500
5000
5500
6000

008-014

DURABLADE ECONOMIZER
PRESSURE DROP
.02
.02
.03
.04
.05
.06
.07
.08
.09

FIOP — Factory-Installed Option

21

ECONOMI$ER
.07
.09
.13
.18
.23
.30
.36
—
—

Table 12 — Fan Performance, 48TF008 — Vertical Discharge Units (SI)
EXTERNAL STATIC PRESSURE (Pa)
AIRFLOW
(L/s)

1150
1200
1275
1300
1400
1450
1500
1550
1600
1650
1700
1750
1800
1850
1900

100

50

150

200

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

8.8
9.0
9.3
9.6
9.9
10.1
10.4
10.7
11.0
11.3
11.5
11.8
12.2
12.4
12.8

0.45
0.47
0.53
0.58
0.63
0.68
0.78
0.81
0.90
0.99
1.06
1.16
1.24
1.35
1.47

10.1
10.3
10.5
10.8
11.1
11.3
11.5
11.8
12.0
12.4
12.6
12.9
13.2
13.4
13.7

0.62
0.65
0.70
0.78
0.85
0.86
0.96
1.06
1.10
1.22
1.30
1.38
1.49
1.60
1.70

11.2
11.4
11.6
11.9
12.1
12.3
12.6
12.8
13.0
13.3
13.6
13.8
14.1
14.4
14.6

0.79
0.82
0.89
0.96
1.02
1.09
1.18
1.25
1.35
1.43
1.54
1.65
1.75
1.84
1.97

12.2
12.4
12.6
12.8
13.1
13.2
13.5
13.7
14.0
14.2
14.4
14.7
14.9
15.1
15.4

0.96
1.02
1.08
1.17
1.26
1.29
1.38
1.48
1.56
1.67
1.78
1.88
2.00
2.10
2.24

EXTERNAL STATIC PRESSURE (Pa)
AIRFLOW
(L/s)

1150
1200
1275
1300
1400
1450
1500
1550
1600
1650
1700
1750
1800
1850
1900

300

250

350

400

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

13.2
13.3
13.5
13.8
14.0
14.1
14.4
14.5
14.8
15.0
15.2
15.5
15.7
15.9
16.2

1.15
1.21
1.28
1.37
1.45
1.53
1.61
1.72
1.80
1.92
2.01
2.14
2.24
2.37
2.51

14.1
14.1
14.3
14.6
14.7
14.9
15.2
15.4
15.6
15.8
16.0
16.2
16.4
16.7
16.9

1.39
1.41
1.46
1.55
1.65
1.73
1.84
1.95
2.07
2.15
2.27
2.41
2.52
2.66
2.78

15.1
15.2
15.3
15.2
15.5
15.6
15.8
16.1
16.3
16.6
16.7
16.9
17.2
17.4
—

1.73
1.76
1.76
1.72
1.84
1.88
2.04
2.15
2.29
2.42
2.56
2.65
2.82
2.92
—

15.8
15.9
16.1
16.3
16.5
16.7
16.4
16.5
17.0
17.2
17.5
17.6
—
—
—

1.96
2.00
2.17
2.17
2.10
2.10
2.18
2.34
2.49
2.66
2.80
2.92
—
—
—

LEGEND
BkW — Fan Input kW x Motor Efficiency
R/s — Revolutions Per Second of Blower Wheel

4. Use of a field-supplied motor may affect wire sizing. Contact
your Carrier representative to verify.
5. Standard drive range is 8.2 to 11.7 r/s. All other speeds require
a field-supplied drive.
6. Maximum continuous BkW is 1.79. Extensive motor and electrical testing on these units ensures that the full range of the
motor can be utilized with confidence. Using the fan motors up
to the ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
7. Interpolation is permissible. Do not extrapolate.

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 5.)
2.
indicates field-supplied motor and drive are required.
3. Values include losses for filters, unit casing, and wet coils.

22

Table 13 — Fan Performance, 48TF012 — Vertical Discharge Units (SI)
EXTERNAL STATIC PRESSURE (Pa)
AIRFLOW
(L/s)

1500
1550
1600
1650
1700
1750
1800
1850
1900
1950
2000
2050
2100
2150
2200
2250
2300
2400
2450

100

50

150

250

200

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

9.8
10.0
10.3
10.6
10.9
11.1
11.4
11.7
12.0
12.2
12.5
12.8
13.1
13.3
13.6
13.9
14.2
14.5
14.8

0.55
0.60
0.66
0.72
0.78
0.86
0.93
1.00
1.08
1.16
1.25
1.34
1.44
1.53
1.64
1.75
1.86
1.98
2.10

10.9
11.2
11.4
11.7
12.0
12.2
12.5
12.7
12.9
13.2
13.4
13.7
13.9
14.2
14.5
14.7
15.0
15.3
15.6

0.67
0.74
0.80
0.86
0.93
1.00
1.08
1.15
1.23
1.31
1.40
1.50
1.60
1.71
1.82
1.94
2.06
2.19
2.32

12.0
12.2
12.4
12.6
12.8
13.1
13.3
13.6
13.8
14.1
14.3
14.6
14.9
15.1
15.3
15.6
15.8
16.1
—

0.79
0.86
0.92
0.98
1.06
1.14
1.22
1.31
1.40
1.49
1.59
1.69
1.80
1.91
2.02
2.13
2.25
2.38
—

12.9
13.1
13.3
13.6
13.7
14.0
14.2
14.4
14.6
14.8
15.1
15.3
15.6
15.8
16.1
16.3
16.6
—
—

0.92
0.98
1.05
1.12
1.20
1.28
1.36
1.44
1.53
1.63
1.74
1.85
1.97
2.09
2.21
2.34
2.47
—
—

13.8
13.9
14.2
14.4
14.6
14.8
15.0
15.2
15.4
15.6
15.9
16.1
16.3
16.5
16.8
—
—
—
—

1.04
1.11
1.18
1.25
1.34
1.42
1.52
1.60
1.70
1.79
1.90
2.00
2.12
2.24
2.37
—
—
—
—

EXTERNAL STATIC PRESSURE (Pa)
AIRFLOW
(L/s)

1500
1550
1600
1650
1700
1750
1800
1850
1900
1950
2000
2050
2100
2150
2200
2250
2300
2400
2450

350

300

400

500

450

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

14.6
14.8
15.0
15.1
15.3
15.5
15.8
16.0
16.2
16.4
16.6
16.8
17.0
17.2
—
—
—
—
—

1.15
1.23
1.30
1.39
1.47
1.56
1.66
1.75
1.86
1.96
2.07
2.18
2.30
2.41
—
—
—
—
—

15.3
15.5
15.7
15.9
16.1
16.3
16.4
16.6
16.9
17.1
17.3
17.5
—
—
—
—
—
—
—

1.26
1.35
1.44
1.52
1.61
1.70
1.80
1.90
2.01
2.12
2.24
2.36
—
—
—
—
—
—
—

16.1
16.2
16.4
16.6
16.8
17.0
17.2
17.3
17.5
17.7
17.9
—
—
—
—
—
—
—
—

1.38
1.47
1.55
1.65
1.74
1.85
1.95
2.05
2.16
2.26
2.39
—
—
—
—
—
—
—
—

16.9
17.1
17.1
17.3
17.4
17.6
17.8
18.0
18.2
18.4
—
—
—
—
—
—
—
—
—

1.45
1.60
1.68
1.77
1.88
1.98
2.09
2.20
2.31
2.43
—
—
—
—
—
—
—
—
—

17.7
17.8
17.9
18.0
18.1
18.2
18.4
18.6
—
—
—
—
—
—
—
—
—
—
—

1.68
1.81
1.86
1.91
2.00
2.11
2.22
2.34
—
—
—
—
—
—
—
—
—
—
—

LEGEND
BkW — Fan Input kW x Motor Efficiency
R/s — Revolutions Per Second of Blower Wheel

5. Standard drive range is 9.5 to 13.0 r/s. All other speeds require
a field-supplied drive.
6. Maximum continuous BkW is 1.79. Extensive motor and electrical testing on these units ensures that the full range of the
motor can be utilized with confidence. Using the fan motors up
to the ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
7. Interpolation is permissible. Do not extrapolate.

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 5.)
2.
indicates field-supplied motor and drive are required.
3. Values include losses for filters, unit casing, and wet coils.
4. Use of a field-supplied motor may affect wire sizing. Contact
your Carrier representative to verify.

23

Table 14 — Fan Performance, 48TF014 — Vertical Discharge Units (SI)
EXTERNAL STATIC PRESSURE (Pa)
AIRFLOW
(L/s)

1900
1950
2000
2050
2100
2150
2250
2300
2350
2400
2450
2500
2550
2600
2650
2700
2750
2800
2850
2900
2950
3000
3050
3100

100

50

150

250

200

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

12.5
12.7
13.0
13.3
13.6
13.9
14.2
14.5
14.8
15.0
15.4
15.7
15.9
16.2
16.5
16.8
17.1
17.4
17.7
18.0
18.3
18.6
18.9
19.2

1.10
1.18
1.27
1.36
1.46
1.56
1.67
1.78
1.89
2.01
2.16
2.28
2.43
2.58
2.72
2.89
3.05
3.21
3.40
3.57
3.76
3.96
4.15
4.38

13.5
13.7
14.0
14.3
14.5
14.8
15.1
15.4
15.7
15.9
16.2
16.5
16.8
17.1
17.3
17.6
17.9
18.2
18.5
18.8
19.1
19.4
19.6
—

1.27
1.36
1.46
1.56
1.66
1.78
1.89
2.00
2.13
2.25
2.38
2.52
2.65
2.81
2.95
3.12
3.28
3.45
3.64
3.81
4.02
4.21
4.40
—

14.4
14.6
14.9
15.1
15.4
15.7
15.9
16.2
16.4
16.7
17.0
17.3
17.5
17.8
18.1
18.4
18.7
18.9
19.2
19.5
19.8
20.1
—
—

1.42
1.52
1.62
1.72
1.84
1.95
2.07
2.19
2.32
2.46
2.60
2.75
2.90
3.05
3.22
3.39
3.56
3.74
3.93
4.11
4.29
4.51
—
—

15.3
15.5
15.7
16.0
16.2
16.5
16.7
17.0
17.2
17.5
17.7
18.0
18.2
18.5
18.8
19.0
19.3
19.6
19.9
20.2
—
—
—
—

1.63
1.73
1.81
1.91
2.01
2.13
2.24
2.37
2.51
2.64
2.79
2.95
3.10
3.26
3.43
3.60
3.80
3.98
4.18
4.37
—
—
—
—

16.1
16.4
16.6
16.8
17.0
17.3
17.5
17.7
18.0
18.2
18.5
18.7
18.0
19.2
19.4
19.7
20.0
20.2
20.5
—
—
—
—
—

1.81
1.92
2.02
2.14
2.25
2.37
2.48
2.60
2.72
2.85
2.99
3.13
3.29
3.47
3.64
3.83
4.01
4.19
4.41
—
—
—
—
—

EXTERNAL STATIC PRESSURE (Pa)
AIRFLOW
(L/s)

1900
1950
2000
2050
2100
2150
2250
2300
2350
2400
2450
2500
2550
2600
2650
2700
2750
2800
2850
2900
2950
3000
3050
3100

350

300

400

500

450

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

17.0
17.2
17.4
17.6
17.8
18.0
18.2
18.5
18.7
18.9
19.2
19.4
19.6
19.9
20.1
20.4
20.6
20.9
—
—
—
—
—
—

2.00
2.11
2.22
2.33
2.45
2.59
2.71
2.85
2.99
3.12
3.27
3.38
3.54
3.69
3.86
4.03
4.21
4.40
—
—
—
—
—
—

17.9
18.0
18.2
18.4
18.6
18.8
19.0
19.2
19.4
19.6
19.8
20.1
20.3
20.5
20.8
21.0
—
—
—
—
—
—
—
—

2.21
2.31
2.43
2.54
2.66
2.79
2.93
3.05
3.21
3.36
3.53
3.67
3.83
4.01
4.16
4.32
—
—
—
—
—
—
—
—

18.7
18.8
19.0
19.2
19.3
19.5
19.7
19.9
20.1
20.3
20.5
20.7
21.0
21.2
21.4
—
—
—
—
—
—
—
—
—

2.39
2.51
2.63
2.76
2.89
3.01
3.15
3.29
3.43
3.59
3.74
3.93
4.09
4.27
4.44
—
—
—
—
—
—
—
—
—

19.4
19.6
19.8
19.9
20.1
20.3
20.4
20.6
20.8
21.0
21.2
21.4
21.6
—
—
—
—
—
—
—
—
—
—
—

2.58
2.71
2.84
2.97
3.10
3.24
3.37
3.52
3.67
3.82
3.99
4.15
4.33
—
—
—
—
—
—
—
—
—
—
—

20.1
20.3
20.5
20.7
20.8
21.0
21.2
21.3
21.5
21.7
—
—
—
—
—
—
—
—
—
—
—
—
—
—

2.74
2.88
3.02
3.17
3.32
3.46
3.60
3.76
3.92
4.08
—
—
—
—
—
—
—
—
—
—
—
—
—
—

LEGEND
BkW — Fan Input kW x Motor Efficiency
R/s — Revolutions Per Second of Blower Wheel

5. Standard drive range is 12.0 to 15.0 r/s. All other speeds
require a field-supplied drive.
6. Maximum continuous BkW is 2.76. Extensive motor and electrical testing on these units ensures that the full range of the
motor can be utilized with confidence. Using the fan motors up
to the ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
7. Interpolation is permissible. Do not extrapolate.

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 5.)
2.
indicates field-supplied motor and drive are required.
3. Values include losses for filters, unit casing, and wet coils.
4. Use of a field-supplied motor may affect wire sizing. Contact
your Carrier representative to verify.

24

Table 15 — Fan Performance, 48TF008 — Horizontal Discharge Units (SI)
EXTERNAL STATIC PRESSURE (Pa)
AIRFLOW
(L/s)

1075
1125
1150
1200
1250
1300
1400
1450
1500
1550
1600
1650
1700
1750
1800
1850
1900

100

50

150

225

200

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

8.1
8.4
8.6
8.9
9.1
9.4
9.7
10.0
10.2
10.5
10.8
11.1
11.4
11.7
12.0
12.2
12.5

0.34
0.39
0.42
0.46
0.51
0.56
0.62
0.67
0.74
0.80
0.88
0.97
1.04
1.12
1.23
1.33
1.42

9.5
9.7
9.9
10.2
10.4
10.7
10.9
11.2
11.4
11.7
11.9
12.2
12.4
12.7
13.0
13.2
13.5

0.49
0.53
0.58
0.64
0.70
0.75
0.82
0.88
0.94
1.02
1.09
1.17
1.25
1.35
1.45
1.54
1.65

10.7
10.9
11.1
11.3
11.5
11.7
12.0
12.2
12.4
12.7
12.9
13.2
13.4
13.7
13.9
14.2
14.4

0.66
0.71
0.76
0.81
0.87
0.93
0.99
1.07
1.15
1.23
1.32
1.41
1.51
1.61
1.70
1.81
1.92

11.8
12.0
12.2
12.4
12.6
12.7
12.9
13.2
13.4
13.6
13.8
14.0
14.3
14.5
14.8
15.0
15.2

0.81
0.89
0.96
1.02
1.08
1.14
1.22
1.27
1.36
1.44
1.53
1.63
1.73
1.85
1.95
2.08
2.20

12.4
12.5
12.7
12.8
13.0
13.2
13.4
13.6
13.8
14.0
14.2
14.4
14.7
14.9
15.1
15.4
15.6

0.92
0.98
1.05
1.11
1.19
1.25
1.33
1.40
1.48
1.56
1.65
1.75
1.85
1.97
2.07
2.20
2.34

EXTERNAL STATIC PRESSURE (Pa)
AIRFLOW
(L/s)

1075
1125
1150
1200
1250
1300
1400
1450
1500
1550
1600
1650
1700
1750
1800
1850
1900

300

250

350

400

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

12.9
13.0
13.1
13.3
13.5
13.7
13.9
14.1
14.3
14.2
14.8
14.9
15.1
15.3
15.5
15.8
16.0

1.03
1.08
1.13
1.21
1.29
1.37
1.44
1.52
1.60
1.68
1.77
1.86
1.97
2.08
2.20
2.32
2.46

13.9
14.0
14.1
14.3
14.4
14.5
14.7
14.9
15.1
15.3
15.5
15.7
15.9
16.1
16.3
16.5
16.7

1.29
1.34
1.38
1.42
1.48
1.56
1.66
1.77
1.86
1.94
2.04
2.13
2.24
2.35
2.45
2.58
2.70

15.0
15.1
15.2
15.2
15.3
15.4
15.5
15.7
15.9
16.1
16.3
16.5
16.6
16.3
17.0
17.2
17.5

1.60
1.68
1.69
1.74
1.78
1.81
1.84
1.97
2.08
2.21
2.31
2.42
2.52
2.64
2.76
2.87
2.99

15.7
15.9
16.0
16.0
16.2
16.3
16.4
16.5
16.6
16.8
17.0
17.2
17.4
17.6
17.7
17.9
18.1

1.89
1.92
1.96
2.01
2.06
2.09
2.19
2.18
2.29
2.43
2.55
2.70
2.82
2.94
3.05
3.19
3.31

LEGEND
BkW — Fan Input kW x Motor Efficiency
R/s — Revolutions Per Second of Blower Wheel

5. Standard drive range is 8.2 to 11.7 r/s. All other speeds require
a field-supplied drive.
6. Maximum continuous BkW is 1.79. Extensive motor and electrical testing on these units ensures that the full range of the
motor can be utilized with confidence. Using the fan motors up
to the ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
7. Interpolation is permissible. Do not extrapolate.

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 5.)
2.
indicates field-supplied motor and drive are required.
3. Values include losses for filters, unit casing, and wet coils.
4. Use of a field-supplied motor may affect wire sizing. Contact
your Carrier representative to verify.

25

Table 16 — Fan Performance, 48TF012 — Horizontal Discharge Units (SI)
EXTERNAL STATIC PRESSURE (Pa)
AIRFLOW
(L/s)

1500
1550
1600
1650
1700
1750
1800
1850
1900
1950
2000
2050
2100
2150
2200
2300
2350
2400
2500

100

50

150

250

200

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

9.1
9.4
9.6
9.8
10.1
10.3
10.6
10.8
11.1
11.3
11.6
11.9
12.1
12.4
12.7
12.9
13.2
13.5
—

0.49
0.54
0.59
0.65
0.71
0.77
0.84
0.92
1.00
1.09
1.18
1.28
1.38
1.49
1.61
1.74
1.86
2.00
—

10.5
10.7
10.9
11.1
11.3
11.5
11.7
11.9
12.1
12.3
12.6
12.8
13.0
13.2
13.4
13.7
13.9
14.2
14.4

0.63
0.68
0.73
0.80
0.86
0.92
0.98
1.04
1.14
1.22
1.31
1.40
1.50
1.60
1.70
1.81
1.93
2.05
2.14

11.6
11.8
12.0
12.2
12.4
12.6
12.8
13.0
13.2
13.4
13.6
13.8
14.0
14.2
14.4
14.6
14.8
15.0
15.2

0.77
0.82
0.88
0.95
1.01
1.07
1.14
1.21
1.29
1.38
1.47
1.56
1.64
1.73
1.83
1.93
2.03
2.14
2.25

12.6
12.8
13.0
13.2
13.4
13.5
13.7
13.9
14.1
14.3
14.5
14.7
14.9
15.1
15.3
15.5
15.7
—
—

0.89
0.96
1.02
1.09
1.16
1.23
1.30
1.39
1.47
1.55
1.65
1.73
1.82
1.93
2.04
2.15
2.27
—
—

13.5
13.7
13.9
14.1
14.2
14.4
14.6
14.8
15.0
15.2
15.3
15.5
15.8
15.9
16.1
—
—
—
—

0.99
1.06
1.14
1.22
3.10
1.38
1.47
1.55
1.64
1.72
1.82
1.92
2.02
2.13
2.24
—
—
—
—

EXTERNAL STATIC PRESSURE (Pa)
AIRFLOW
(L/s)

1500
1550
1600
1650
1700
1750
1800
1850
1900
1950
2000
2050
2100
2150
2200
2300
2350
2400
2500

350

300

400

500

450

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

14.5
14.6
14.8
14.9
15.0
15.2
15.4
15.6
15.8
16.0
16.2
16.3
16.5
16.7
16.9
—
—
—
—

1.13
1.20
1.26
1.33
1.42
1.51
1.61
1.71
1.80
1.91
2.01
2.10
2.21
2.32
2.43
—
—
—
—

15.2
15.4
15.6
15.7
15.9
16.0
16.2
16.3
16.5
16.7
16.9
17.1
—
—
—
—
—
—
—

1.22
1.30
1.40
1.48
1.56
1.64
1.73
1.84
1.94
2.06
2.17
2.29
—
—
—
—
—
—
—

16.1
16.2
16.3
16.5
16.7
16.8
17.0
17.1
17.2
17.4
17.6
—
—
—
—
—
—
—
—

1.40
1.43
1.50
1.60
1.70
1.79
1.89
1.98
2.07
2.19
2.31
—
—
—
—
—
—
—
—

16.8
16.9
17.1
17.2
17.3
17.5
17.7
17.8
18.0
—
—
—
—
—
—
—
—
—
—

1.54
1.60
1.68
1.72
1.81
1.91
2.03
2.15
2.24
—
—
—
—
—
—
—
—
—
—

17.7
17.8
17.9
18.0
18.0
18.2
18.3
18.5
18.7
—
—
—
—
—
—
—
—
—
—

1.82
1.86
1.91
1.97
1.97
2.04
2.15
2.27
2.40
—
—
—
—
—
—
—
—
—
—

LEGEND
BkW — Fan Input kW x Motor Efficiency
R/s — Revolutions Per Second of Blower Wheel

5. Standard drive range is 9.5 to 13.0 r/s. All other speeds require
a field-supplied drive.
6. Maximum continuous BkW is 1.79. Extensive motor and electrical testing on these units ensures that the full range of the
motor can be utilized with confidence. Using the fan motors up
to the ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
7. Interpolation is permissible. Do not extrapolate.

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 5.)
2.
indicates field-supplied motor and drive are required.
3. Values include losses for filters, unit casing, and wet coils.
4. Use of a field-supplied motor may affect wire sizing. Contact
your Carrier representative to verify.

26

Table 17 — Fan Performance, 48TF014 — Horizontal Discharge Units (SI)
EXTERNAL STATIC PRESSURE (Pa)
AIRFLOW
(L/s)

1900
1950
2000
2050
2100
2150
2200
2250
2325
2400
2450
2500
2550
2600
2650
2700
2750
2800
2850
2900
2950
3000
3050
3100

100

50

150

225

200

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

11.5
11.8
12.1
12.3
12.6
12.8
13.1
13.3
13.6
13.9
14.1
14.4
14.7
14.9
15.2
15.4
15.7
15.9
16.2
16.5
16.7
17.0
17.3
17.5

0.96
1.04
1.12
1.18
1.27
1.36
1.44
1.53
1.63
1.74
1.84
1.95
2.07
2.18
2.32
2.44
2.57
2.71
2.86
2.98
3.11
3.25
3.38
3.52

12.7
12.9
13.2
13.4
13.6
13.9
14.1
14.4
14.6
14.9
15.1
15.4
15.6
15.8
16.1
16.4
16.6
16.9
17.1
17.3
17.6
17.8
18.1
18.3

1.14
1.22
1.29
1.38
1.46
1.56
1.66
1.75
1.87
1.98
2.10
2.22
2.34
2.47
2.60
2.74
2.89
3.03
3.18
3.32
3.46
3.60
3.74
3.89

13.7
13.9
14.2
14.4
14.6
14.9
15.1
15.3
15.5
15.8
16.0
16.2
16.5
16.7
16.9
17.2
17.4
17.7
17.9
18.2
18.4
18.7
—
—

1.32
1.40
1.49
1.59
1.68
1.78
1.88
1.99
2.10
2.20
2.31
2.44
2.56
2.69
2.83
2.96
3.11
3.27
3.46
3.57
3.72
3.87
—
—

14.7
14.9
15.1
15.3
15.5
15.7
16.0
16.2
16.4
16.6
16.8
17.1
17.3
17.5
17.8
18.0
18.2
18.4
18.7
18.9
—
—
—
—

1.49
1.57
1.65
1.75
1.86
1.96
2.07
2.20
2.30
2.44
2.56
2.69
2.83
2.96
3.11
3.26
8.38
3.55
3.70
3.85
—
—
—
—

15.6
15.8
16.0
16.2
16.4
16.6
16.8
17.0
17.2
17.4
17.6
17.8
18.1
18.3
18.5
18.7
19.0
19.2
—
—
—
—
—
—

1.71
1.80
1.89
1.96
2.05
2.15
2.26
2.36
2.50
2.64
2.77
2.90
3.05
3.20
3.34
3.51
3.67
3.84
—
—
—
—
—
—

EXTERNAL STATIC PRESSURE (Pa)
AIRFLOW
(L/s)

1900
1950
2000
2050
2100
2150
2200
2250
2235
2400
2450
2500
2550
2600
2650
2700
2750
2800
2850
2900
2950
3000
3050
3100

350

300

400

500

450

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

R/s

BkW

16.6
16.7
16.9
17.1
17.2
17.4
17.6
17.8
18.0
18.2
18.4
18.6
18.8
19.0
19.2
19.4
19.7
—
—
—
—
—
—
—

1.91
2.00
2.11
2.20
2.30
2.42
2.52
2.61
2.71
2.83
2.97
3.09
3.25
3.42
3.58
3.73
3.91
—
—
—
—
—
—
—

17.5
17.6
17.8
17.9
18.1
18.2
18.4
18.6
18.8
18.9
19.1
19.3
19.5
19.7
19.9
20.1
—
—
—
—
—
—
—
—

2.11
2.21
2.31
2.42
2.53
2.64
2.76
2.88
3.00
3.13
3.24
3.35
3.49
3.63
3.81
3.92
—
—
—
—
—
—
—
—

18.2
18.4
18.6
18.7
18.9
19.0
19.2
19.4
19.5
19.7
19.9
20.0
20.2
20.4
—
—
—
—
—
—
—
—
—
—

2.29
2.41
2.52
2.64
2.76
2.88
2.99
3.11
3.26
3.39
3.52
3.66
3.81
3.95
—
—
—
—
—
—
—
—
—
—

18.9
19.1
19.3
19.5
19.6
19.8
20.0
20.1
20.3
20.5
20.6
20.8
—
—
—
—
—
—
—
—
—
—
—
—

2.44
2.58
2.71
2.84
2.97
3.10
3.23
3.37
3.49
3.64
3.77
3.93
—
—
—
—
—
—
—
—
—
—
—
—

19.3
19.6
19.9
20.1
20.3
20.5
20.7
20.9
21.0
21.2
—
—
—
—
—
—
—
—
—
—
—
—
—
—

2.55
2.71
2.87
3.02
3.17
3.31
3.45
3.60
3.75
3.89
—
—
—
—
—
—
—
—
—
—
—
—
—
—

LEGEND
BkW — Fan Input kW x Motor Efficiency
R/s — Revolutions Per Second of Blower Wheel

5. Standard drive range is 12.0 to 15.0 r/s. All other speeds
require a field-supplied drive.
6. Maximum continuous BkW is 2.76. Extensive motor and electrical testing on these units ensures that the full range of the
motor can be utilized with confidence. Using the fan motors up
to the ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
7. Interpolation is permissible. Do not extrapolate.

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 5.)
2.
indicates field-supplied motor and drive are required.
3. Values include losses for filters, unit casing, and wet coils.
4. Use of a field-supplied motor may affect wire sizing. Contact
your Carrier representative to verify.

27

Table 18 — Fan Performance, 48TF008 — Vertical Discharge Units (English)
EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)

2200
2250
2300
2400
2500
2550
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3750

0.4

0.2

0.6

0.8

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

506
514
521
536
551
559
567
582
598
614
630
646
662
679
695
712
729
745
754

0.52
0.55
0.56
0.63
0.69
0.72
0.75
0.83
0.90
0.98
1.07
1.16
1.26
1.36
1.47
1.59
1.71
1.84
1.91

586
593
600
613
626
634
641
655
670
684
699
714
729
744
759
774
790
805
813

0.72
0.76
0.79
0.85
0.93
0.97
1.00
1.08
1.17
1.25
1.35
1.45
1.55
1.66
1.78
1.90
2.03
2.17
2.24

656
662
668
680
693
700
706
719
732
745
759
773
787
801
816
830
845
860
868

0.95
0.99
1.02
1.09
1.17
1.21
1.25
1.34
1.43
1.53
1.63
1.74
1.86
1.98
2.10
2.23
2.37
2.52
2.59

718
724
730
741
753
759
764
776
789
802
815
828
841
854
867
881
895
909
917

1.18
1.22
1.26
1.34
1.43
1.48
1.52
1.61
1.71
1.81
1.92
2.04
2.16
2.29
2.42
2.56
2.71
2.87
2.95

EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)

2200
2250
2300
2400
2500
2550
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3750

1.2

1.0

1.4

1.6

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

776
781
786
796
808
814
819
831
842
854
866
878
891
904
917
930
943
956
963

1.43
1.78
1.50
1.59
1.69
1.74
1.79
1.89
2.00
2.11
2.23
2.35
2.48
2.61
2.75
2.90
3.05
3.22
3.30

838
841
843
849
859
864
869
880
892
903
915
926
938
950
963
976
988
—
—

1.78
1.81
1.83
1.88
1.96
2.01
2.06
2.17
2.29
2.42
2.54
2.67
2.81
2.95
3.10
3.25
3.41
—
—

898
902
905
910
912
915
918
927
938
949
961
972
983
995
1007
—
—
—
—

2.21
2.25
2.28
2.31
2.31
2.34
2.37
2.47
2.58
2.71
2.85
3.00
3.14
3.30
3.45
—
—
—
—

935
939
943
952
963
968
973
976
983
993
1003
1015
1026
—
—
—
—
—
—

2.58
2.60
2.62
2.74
2.81
2.81
2.81
2.84
2.92
3.03
3.17
3.32
3.47
—
—
—
—
—
—

LEGEND
Bhp — Brake Horsepower at Motor Shaft
Rpm — Revolutions Per Minute of Blower Wheel

5. Standard drive range is 492 to 700 rpm. All other rpms require
a field-supplied drive.
6. Maximum continuous bhp is 2.4. Extensive motor and electrical
testing on these units ensures that the full range of the motor
can be utilized with confidence. Using the fan motors up to the
ratings shown will not result in nuisance tripping or premature
motor failure. Unit warranty will not be affected.
7. Interpolation is permissible. Do not extrapolate.

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 5.)
2.
indicates field-supplied motor and drive are required.
3. Values include losses for filters, unit casing, and wet coils.
4. Use of a field-supplied motor may affect wire sizing. Contact
your Carrier representative to verify.

28

Table 19 — Fan Performance, 48TF012 — Vertical Discharge Units (English)
EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)

3000
3100
3200
3300
3400
3500
3600
3700
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
4800
4900
5000

0.4

0.2

0.6

1.0

0.8

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

592
607
622
638
653
669
684
700
715
731
747
763
778
794
810
826
842
858
874
890
906

0.76
0.83
0.90
0.98
1.06
1.15
1.24
1.33
1.43
1.54
1.65
1.76
1.88
2.00
2.13
2.27
2.41
2.55
2.70
2.86
3.03

661
676
690
705
719
733
747
760
774
787
801
816
831
846
861
876
892
907
922
938
953

0.93
1.01
1.09
1.17
1.26
1.35
1.44
1.54
1.64
1.74
1.85
1.97
2.10
2.23
2.37
2.52
2.67
2.83
2.99
3.16
3.33

722
734
746
759
772
786
800
814
828
843
857
872
886
900
913
927
940
954
968
—
—

1.09
1.17
1.25
1.33
1.43
1.53
1.64
1.75
1.86
1.98
2.10
2.23
2.36
2.50
2.64
2.78
2.92
3.08
3.24
—
—

779
791
803
815
826
838
850
863
875
888
902
916
929
943
958
973
987
1002
—
—
—

1.26
1.34
1.43
1.52
1.62
1.72
1.82
1.92
2.04
2.16
2.30
2.44
2.58
2.73
2.89
3.04
3.21
3.38
—
—
—

829
840
852
864
876
888
900
912
924
936
948
960
972
985
999
1012
—
—
—
—
—

1.42
1.51
1.60
1.70
1.81
1.91
2.03
2.14
2.26
2.30
2.51
2.64
2.78
2.93
3.09
3.26
—
—
—
—
—

EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)

3000
3100
3200
3300
3400
3500
3600
3700
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
4800
4900
5000

1.4

1.2

1.6

2.0

1.8

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

880
890
900
910
921
933
945
957
969
981
993
1005
1016
1028
1040
—
—
—
—
—
—

1.58
1.68
1.77
1.88
1.98
2.10
2.22
2.34
2.47
2.60
2.74
2.88
3.03
3.17
3.32
—
—
—
—
—
—

924
935
946
957
967
976
986
998
1010
1022
1034
1046
1058
—
—
—
—
—
—
—
—

1.73
1.84
1.95
2.06
2.17
2.29
2.41
2.54
2.67
2.81
2.96
3.11
3.26
—
—
—
—
—
—
—
—

970
977
987
998
1009
1020
1030
1039
1049
1060
1072
1084
—
—
—
—
—
—
—
—
—

1.89
2.00
2.11
2.23
2.35
2.48
2.61
2.74
2.87
3.02
3.17
3.32
—
—
—
—
—
—
—
—
—

1019
1026
1029
1037
1047
1058
1069
1081
1091
1100
1110
—
—
—
—
—
—
—
—
—
—

2.00
2.17
2.28
2.40
2.53
2.66
2.80
2.94
3.08
3.23
3.38
—
—
—
—
—
—
—
—
—
—

1066
1070
1075
1082
1087
1095
1106
1117
1128
—
—
—
—
—
—
—
—
—
—
—
—

2.30
2.44
2.51
2.58
2.70
2.84
2.98
3.13
3.29
—
—
—
—
—
—
—
—
—
—
—
—

LEGEND
Bhp — Brake Horsepower at Motor Shaft
Rpm — Revolutions Per Minute of Blower Wheel

5. Standard drive range is 571 to 779 rpm. All other speeds
require a field-supplied drive.
6. Maximum continuous bhp is 2.4. Extensive motor and electrical
testing on these units ensures that the full range of the motor
can be utilized with confidence. Using the fan motors up to the
ratings shown will not result in nuisance tripping or premature
motor failure. Unit warranty will not be affected.
7. Interpolation is permissible. Do not extrapolate.

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 5.)
2.
indicates field-supplied motor and drive are required.
3. Values include losses for filters, unit casing, and wet coils.
4. Use of a field-supplied motor may affect wire sizing. Contact
your Carrier representative to verify.

29

Table 20 — Fan Performance, 48TF014 — Vertical Discharge Units (English)
EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)

3700
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
4800
4900
5000
5100
5200
5300
5400
5500
5600
5700
5800
5900
6000
6100
6200

0.4

0.2

0.6

1.0

0.8

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

729
745
761
777
793
810
826
842
859
876
892
909
926
942
959
976
993
1010
1027
1043
1060
1077
1094
1111
1128
1145

1.36
1.46
1.56
1.67
1.79
1.91
2.04
2.17
2.31
2.46
2.60
2.77
2.93
3.11
3.29
3.47
3.67
3.87
4.07
4.29
4.51
4.74
4.98
5.22
5.48
5.74

790
805
820
836
851
867
883
898
914
930
945
961
977
993
1009
1025
1041
1057
1073
1090
1106
1122
1139
1155
—
—

1.58
1.69
1.80
1.92
2.05
2.18
2.32
2.46
2.60
2.76
2.91
3.07
3.24
3.41
3.60
3.78
3.98
4.18
4.39
4.61
4.83
5.07
5.41
5.55
—
—

847
861
875
889
904
918
933
948
962
977
992
1008
1024
1039
1055
1071
1086
1102
1118
1133
1149
1165
1181
—
—
—

1.79
1.89
2.02
2.14
2.27
2.41
2.55
2.70
2.85
3.01
3.18
3.36
3.54
3.73
3.92
4.12
4.33
4.54
4.76
4.99
5.22
5.46
5.70
—
—
—

902
915
928
941
955
968
982
996
1010
1024
2039
1053
1068
1080
1097
1112
1127
1142
1157
1173
1189
—
—
—
—
—

2.06
2.17
2.29
2.40
2.42
2.54
2.79
2.93
3.09
3.26
3.43
3.61
3.80
3.90
4.19
4.40
4.61
4.84
5.07
5.31
5.55
—
—
—
—
—

955
967
979
991
1004
1017
1030
1043
1056
1070
1083
1097
1111
1126
1139
1153
1168
1182
1197
1211
—
—
—
—
—
—

2.29
2.41
2.55
2.68
2.82
2.96
3.11
3.25
3.40
3.55
3.71
3.88
4.06
4.25
4.46
4.67
4.90
5.13
5.36
5.61
—
—
—
—
—
—

EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)

3700
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
4800
4900
5000
5100
5200
5300
5400
5500
5600
5700
5800
5900
6000
6100
6200

1.4

1.2

1.6

2.0

1.8

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

1008
1019
1029
1040
1052
1064
1076
1088
1101
1114
1126
1140
1153
1166
1180
1194
1208
1221
1235
—
—
—
—
—
—
—

2.55
2.67
2.80
2.94
3.08
3.23
3.40
3.56
3.73
3.90
4.07
4.25
4.41
4.59
4.78
4.98
5.19
5.41
5.64
—
—
—
—
—
—
—

1060
1070
1079
1089
1100
1110
1121
1133
1144
1157
1169
1181
1194
1207
1220
1233
1246
—
—
—
—
—
—
—
—
—

2.80
2.94
3.07
3.22
3.36
3.51
3.67
3.84
4.00
4.19
4.38
4.58
4.77
4.97
5.18
5.38
5.58
—
—
—
—
—
—
—
—
—

1108
1118
1128
1137
1147
1157
1167
1178
1188
1199
1210
1222
1234
1247
1259
1272
—
—
—
—
—
—
—
—
—
—

3.05
3.19
3.34
3.49
3.65
3.81
3.97
4.14
4.31
4.49
4.68
4.87
5.09
5.30
5.52
5.74
—
—
—
—
—
—
—
—
—
—

1152
1163
1173
1183
1193
1202
1212
1222
1232
1242
1252
1263
1274
1286
—
—
—
—
—
—
—
—
—
—
—
—

3.27
3.44
3.60
3.76
3.93
4.09
4.27
4.44
4.62
4.81
5.00
5.20
5.40
5.62
—
—
—
—
—
—
—
—
—
—
—
—

1190
1203
1214
1225
1236
1245
1255
1265
1274
1284
1294
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

3.46
3.65
3.83
4.00
4.19
4.38
4.56
4.74
4.93
5.13
5.33
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

LEGEND
Bhp — Brake Horsepower at Motor Shaft
Rpm — Revolutions Per Minute of Blower Wheel

5. Standard drive range is 717 to 900 rpm. All other rpms require
a field-supplied drive.
6. Maximum continuous bhp is 3.7. Extensive motor and electrical
testing on these units ensures that the full range of the motor
can be utilized with confidence. Using the fan motors up to the
ratings shown will not result in nuisance tripping or premature
motor failure. Unit warranty will not be affected.
7. Interpolation is permissible. Do not extrapolate.

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 5.)
2.
indicates field-supplied motor and drive are required.
3. Values include losses for filters, unit casing, and wet coils.
4. Use of a field-supplied motor may affect wire sizing. Contact
your Carrier representative to verify.

30

Table 21 — Fan Performance, 48TF008 — Horizontal Discharge Units (English)
EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)

2200
2250
2300
2400
2500
2550
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3750

0.4

0.2

0.6

0.9

0.8

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

499
507
513
528
542
550
557
573
588
604
620
636
652
668
684
701
717
733
742

0.50
0.53
0.55
0.60
0.66
0.69
0.72
0.79
0.86
0.94
1.02
1.11
1.21
1.31
1.41
1.53
1.65
1.77
1.84

580
586
592
606
619
627
634
648
662
676
690
704
718
732
747
762
777
792
800

0.70
0.73
0.76
0.83
0.90
0.94
0.97
1.05
1.13
1.21
1.30
1.39
1.49
1.59
1.70
1.82
1.94
2.07
2.14

652
658
663
674
686
692
698
711
723
737
750
764
778
793
807
821
835
849
856

0.94
0.97
1.00
1.06
1.13
1.17
1.21
1.29
1.38
1.48
1.58
1.69
1.80
1.92
2.04
2.16
2.29
2.42
2.49

717
722
727
738
748
754
759
770
782
794
806
818
831
844
857
871
885
899
907

1.17
1.22
1.26
1.34
1.41
1.45
1.49
1.58
1.66
1.76
1.86
1.97
2.09
2.21
2.35
2.48
2.63
2.78
2.86

748
752
756
766
777
783
787
798
809
821
832
844
856
869
882
895
908
922
929

1.30
1.34
1.38
1.46
1.55
1.60
1.64
1.73
1.82
1.92
2.02
2.13
2.25
2.37
2.51
2.64
2.79
2.95
3.03

EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)

2200
2250
2300
2400
2500
2550
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3750

1.2

1.0

1.4

1.6

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

779
783
786
795
806
812
816
827
837
848
849
870
882
894
907
919
932
945
952

1.43
1.46
1.49
1.58
1.68
1.74
1.79
1.88
1.98
2.08
2.18
2.29
2.40
2.53
2.66
2.80
2.95
3.11
3.20

839
843
846
853
859
864
868
878
889
900
910
920
931
942
954
966
978
990
997

1.78
1.81
1.84
1.88
1.94
1.99
2.04
2.16
2.29
2.41
2.52
2.64
2.76
2.89
3.02
3.15
3.30
3.45
3.54

905
908
910
912
919
920
921
928
937
947
958
968
979
989
1000
1011
1022
1034
1040

2.21
2.25
2.25
2.31
2.37
2.39
2.41
2.45
2.57
2.70
2.85
2.99
3.13
3.26
3.40
3.55
3.69
3.84
3.93

951
955
959
967
971
974
976
983
986
993
1002
1012
1023
1034
1044
1054
1065
1076
1082

2.57
2.59
2.61
2.68
2.73
2.76
2.78
2.88
2.91
3.01
3.15
3.30
3.47
3.63
3.79
3.94
4.10
4.28
5.27

LEGEND
Bhp — Brake Horsepower at Motor Shaft
Rpm — Revolutions Per Minute of Blower Wheel

5. Standard drive range is 492 to 700 rpm. All other rpms require
a field-supplied drive.
6. Maximum continuous bhp is 2.4. Extensive motor and electrical
testing on these units ensures that the full range of the motor
can be utilized with confidence. Using the fan motors up to the
ratings shown will not result in nuisance tripping or premature
motor failure. Unit warranty will not be affected.
7. Interpolation is permissible. Do not extrapolate.

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 5.)
2.
indicates field-supplied motor and drive are required.
3. Values include losses for filters, unit casing, and wet coils.
4. Use of a field-supplied motor may affect wire sizing. Contact
your Carrier representative to verify.

31

Table 22 — Fan Performance, 48TF012 — Horizontal Discharge Units (English)
EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)

3000
3100
3200
3300
3400
3500
3600
3700
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
4800
4900
5000

0.4

0.2

0.6

1.0

0.8

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

552
565
578
591
605
619
633
648
662
677
692
707
722
737
752
768
783
799
814
—
—

0.68
0.74
0.81
0.88
0.96
1.04
1.13
1.23
1.33
1.44
1.55
1.67
1.80
1.94
2.08
2.24
2.40
2.56
2.74
—
—

632
644
656
668
680
691
703
714
726
738
750
762
775
787
800
814
827
841
855
868
883

0.87
0.93
1.00
1.08
1.16
1.23
1.31
1.39
1.51
1.61
1.73
1.84
1.97
2.09
2.21
2.35
2.50
2.64
2.80
2.90
3.10

701
711
723
734
745
755
766
777
789
801
813
825
837
848
860
871
883
894
906
918
931

1.05
1.12
1.20
1.28
1.36
1.44
1.52
1.61
1.72
1.82
1.94
2.05
2.16
2.27
2.39
2.51
2.64
2.77
2.91
3.05
3.21

761
772
782
793
803
813
824
835
846
857
868
878
889
900
912
924
937
949
961
972
—

1.22
1.31
1.39
1.47
1.56
1.65
1.74
1.85
1.95
2.06
2.17
2.28
2.40
252
2.66
2.80
2.95
3.10
3.26
3.40
—

816
825
835
845
856
867
877
887
897
908
918
929
941
952
962
973
983
994
—
—
—

1.36
1.45
1.55
1.65
1.75
1.86
1.97
2.07
2.18
2.29
2.40
2.53
2.66
2.80
2.93
3.07
3.21
3.36
—
—
—

EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)

3000
3100
3200
3300
3400
3500
3600
3700
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
4800
4900
5000

1.4

1.2

1.6

2.0

1.8

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

871
879
887
895
904
914
924
935
946
956
967
977
987
999
1008
1019
—
—
—
—
—

1.54
1.63
1.71
1.80
1.91
2.03
2.15
2.28
2.40
2.53
2.66
2.78
2.91
3.04
3.19
3.34
—
—
—
—
—

918
928
937
946
953
961
970
980
989
1000
1010
1021
1032
1042
—
—
—
—
—
—
—

1.67
1.78
1.90
2.00
2.10
2.20
2.32
2.45
2.58
2.73
2.87
3.02
3.17
3.32
—
—
—
—
—
—
—

967
973
981
991
1000
1009
1017
1024
1033
1042
1052
1062
1072
—
—
—
—
—
—
—
—

1.89
1.94
2.04
2.16
2.29
2.41
2.53
2.64
2.76
2.91
3.06
3.22
3.38
—
—
—
—
—
—
—
—

1010
1018
1026
1032
1041
1051
1061
1069
1077
1085
1093
1102
—
—
—
—
—
—
—
—
—

2.09
2.17
2.26
2.32
2.44
2.57
2.72
2.87
2.99
3.12
3.24
3.41
—
—
—
—
—
—
—
—
—

1063
1070
1075
1080
1083
1090
1099
1109
1118
1127
—
—
—
—
—
—
—
—
—
—
—

2.46
2.51
2.57
2.64
2.65
2.74
2.88
3.03
3.20
3.36
—
—
—
—
—
—
—
—
—
—
—

LEGEND
Bhp — Brake Horsepower at Motor Shaft
Rpm — Revolutions Per Minute of Blower Wheel

5. Standard drive range is 571 to 779 rpm. All other rpms require
a field-supplied drive.
6. Maximum continuous bhp is 2.4. Extensive motor and electrical
testing on these units ensures that the full range of the motor
can be utilized with confidence. Using the fan motors up to the
ratings shown will not result in nuisance tripping or premature
motor failure. Unit warranty will not be affected.
7. Interpolation is permissible. Do not extrapolate.

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 5.)
2.
indicates field-supplied motor and drive are required.
3. Values include losses for filters, unit casing, and wet coils.
4. Use of a field-supplied motor may affect wire sizing. Contact
your Carrier representative to verify.

32

Table 23 — Fan Performance, 48TF014 — Horizontal Discharge Units (English)
EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)

3700
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
4800
4900
5000
5100
5200
5300
5400
5500
5600
5700
5800
5900
6000
6100
6200

0.4

0.2

0.6

1.0

0.8

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

677
691
705
720
734
749
764
779
793
808
822
837
852
867
882
896
911
926
940
955
970
985
1000
1015
1030
1046

1.20
1.28
1.37
1.47
1.56
1.66
1.77
1.88
1.99
2.11
2.24
2.37
2.51
2.65
2.79
2.95
3.11
3.27
3.44
3.62
3.80
3.99
4.18
4.39
4.59
4.81

748
761
773
786
800
813
826
840
854
868
882
896
910
924
938
952
967
981
995
1010
1024
1039
1053
1068
1083
1097

1.43
1.52
1.62
1.71
1.82
1.92
2.04
2.16
2.28
2.42
2.56
2.71
2.86
3.01
3.17
3.33
3.50
3.68
3.86
4.04
4.23
4.42
4.62
4.83
5.04
5.26

810
822
834
847
860
873
886
899
912
925
937
950
963
977
990
1003
1017
1030
1044
1058
1072
1086
1100
1114
1128
1142

1.65
1.75
1.86
1.97
2.09
2.21
2.33
2.46
2.59
2.73
2.86
3.00
3.15
3.30
3.46
3.63
3.80
3.98
4.17
4.38
4.59
4.80
5.02
5.25
5.48
5.71

869
880
891
902
914
926
938
951
963
975
988
1001
1014
1027
1040
1053
1066
1079
1092
1105
1118
1131
1144
1158
—
—

1.89
1.98
2.08
2.19
2.31
2.44
2.57
2.71
2.86
3.00
3.16
3.32
3.48
3.65
3.82
4.00
4.18
4.35
4.54
4.73
4.93
5.14
5.36
5.58
—
—

928
937
947
956
967
978
989
1000
1012
1024
1036
1048
1060
1073
1085
1098
1111
1124
1137
1150
1163
1176
—
—
—
—

2.17
2.28
2.39
2.50
2.60
2.71
2.83
2.96
3.09
3.25
3.42
3.59
3.76
3.94
4.12
4.30
4.50
4.70
4.91
5.12
5.34
5.56
—
—
—
—

EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW
(Cfm)

3700
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
4800
4900
5000
5100
5200
5300
5400
5500
5600
5700
5800
5900
6000
6100
6200

1.4

1.2

1.6

2.0

1.8

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

Rpm

Bhp

984
993
1002
1011
1021
1030
1040
1050
1061
1071
1082
1093
1105
1117
1129
1141
1153
1166
1178
1190
1203
—
—
—
—
—

2.43
2.55
2.66
2.79
2.91
3.04
3.18
3.31
3.43
3.56
3.70
3.86
4.02
4.20
4.40
4.60
4.80
5.01
5.22
5.44
5.67
—
—
—
—
—

1036
1046
1055
1064
1072
1081
1090
1100
1109
1119
1129
1139
1150
1161
1172
1183
1194
1206
1218
1230
—
—
—
—
—
—

2.68
2.81
2.94
3.07
3.20
3.34
3.48
3.63
3.78
3.93
4.09
4.24
4.38
4.54
4.71
4.91
5.08
5.29
5.52
5.75
—
—
—
—
—
—

1080
1092
1102
1112
1121
1130
1139
1148
1156
1166
1175
1185
1194
1204
1214
1225
1236
1247
—
—
—
—
—
—
—
—

2.90
3.05
3.20
3.34
3.49
3.64
3.79
3.94
4.09
4.26
4.43
4.60
4.77
4.95
5.13
5.29
5.47
5.65
—
—
—
—
—
—
—
—

1114
1129
1143
1155
1165
1175
1185
1194
1203
1212
1221
1230
1239
1248
1257
1267
—
—
—
—
—
—
—
—
—
—

3.07
3.25
3.42
3.59
3.76
3.92
4.08
4.25
4.42
4.58
4.76
4.93
5.12
5.31
5.61
5.70
—
—
—
—
—
—
—
—
—
—

1135
1156
1174
1190
1203
1215
1226
1236
1246
1255
1264
1273
1282
1291
—
—
—
—
—
—
—
—
—
—
—
—

3.17
3.39
3.59
3.80
3.99
4.18
4.36
4.54
4.72
4.91
5.09
5.28
5.47
5.66
—
—
—
—
—
—
—
—
—
—
—
—

LEGEND
Bhp — Brake Horsepower at Motor Shaft
Rpm — Revolutions Per Minute of Blower Wheel

5. Standard drive range is 717 to 900 rpm. All other rpms require
a field-supplied drive.
6. Maximum continuous bhp is 3.7. Extensive motor and electrical
testing on these units ensures that the full range of the motor
can be utilized with confidence. Using the fan motors up to the
ratings shown will not result in nuisance tripping or premature
motor failure. Unit warranty will not be affected.
7. Interpolation is permissible. Do not extrapolate.

NOTES:
1. Boldface indicates field-supplied drive required. (See Note 5.)
2.
indicates field-supplied motor and drive are required.
3. Values include losses for filters, unit casing, and wet coils.
4. Use of a field-supplied motor may affect wire sizing. Contact
your Carrier representative to verify.

33

START-UP

TO SHUT OFF UNIT — Set system selector switch at OFF
position. Resetting thermostat at a position above room temperature shuts unit off temporarily until space temperature exceeds thermostat setting.

Unit Preparation — Make sure that unit has been installed in accordance with these installation instructions and
applicable codes. Make sure that Start-Up Checklist, located on
back page of this booklet, has been completed and filled out.

Main Burners — Main burners are factory set and should
require no adjustment.
TO CHECK ignition of main burners and heating controls,
move thermostat set point above room temperature and verify
that the burners light and evaporator fan is energized. After ensuring that the unit continues to heat the building, lower the
thermostat setting below the room temperature and verify that
the burners and evaporator fan turn off (fan will turn off only if
fan selector switch is in the AUTO. position). Refer to Table 24
for the correct orifice to use at high altitudes.
NOTE: Upon a call for heat, the main burners will remain on
for a minimum of 60 seconds.
ADJUST GAS INPUT — The gas input to the unit is determined by measuring the gas flow at the meter or by measuring
the manifold pressure. Manifold pressure should be 872 Pa
(3.5 in. wg).
NOTE: Unit uses a 2 stage gas valve. There is no need to
adjust the “Low Fire” manifold pressure.
Measure Gas Flow (Natural Gas Units) — Minor adjustment
to the gas flow can be made by changing the manifold pressure.
The manifold pressure must be 872 Pa (3.5 in wg). Normal
manifold pressure is 872 Pa (3.5 in. wg) in high fire, W1 and
W2 inputs to gas valve.
Proceed as follows:
1. Turn off gas supply to unit.
2. Remove pipe plug on manifold then connect manometer
at this point. Turn on gas to unit. Ensure gas valve is in
high fire operation.
Observe manifold pressure and proceed as follows to adjust
gas input:
1. Remove cover screw over regulator adjustment screw on
gas valve. Ensure gas valve is operating in high fire
mode.
2. Turn regulator adjustment screw clockwise to increase
gas input, or turn regulator adjustment screw counterclockwise to decrease input. High fire manifold pressure
must be 872 Pa (3.5 in. wg).

Return-Air Filters — Make sure correct filters are installed in filter tracks (see Tables 1A and 1B). Do not operate
unit without return-air filters.
Outdoor-Air Inlet Screens — Outdoor-air inlet screens
must be in place before operating unit.
Compressor Mounting — Compressors are internally
spring mounted. Do not loosen or remove compressor holddown bolts. On 48TF014 units, remove the tiedown bands that
hold the compressors together.

Internal Wiring — Check all electrical connections in
unit control boxes. Tighten as required. Ensure wiring does not
come into direct contact with refrigerant tubing.

Refrigerant Service Ports — Each refrigerant system has 4 Schrader-type service gage ports: one on the suction
line, one on the liquid line, and two on the compressor discharge line. Be sure that caps on the ports are tight. One
Schrader-type valve is located under both the high-pressure
switch and the low-pressure switch when ordered as an option.

High Flow Valves — Located on the compressor hot gas
and suction tubes are High Flow Valves. Large black plastic
caps distinguish these valves with O-rings located inside the
caps. These valves cannot be accessed for service in the field.
Ensure the plastic caps are in place and tight or the possibility
of refrigerant leakage could occur.

Compressor Rotation — On 3-phase units with scroll
compressors, it is important to be certain compressor is rotating
in the proper direction. To determine whether or not compressor is 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.
2. Turn off power to the unit and install lockout tag.
3. Reverse any two of the unit power leads.
4. Reapply power to unit. Reenergize compressor.
The suction and discharge pressure levels should now move
to their normal start-up levels.
NOTE: When the compressor is rotating in the wrong direction, the unit will make an elevated level of noise and will not
provide cooling.

Unsafe operation of the unit may result if manifold pressure is outside 847 to 897 Pa (3.4 to 3.6 in. wg) range. Personal injury or unit damage may result.
3. Replace cover screw cap on gas valve.
4. Turn off gas supply to unit. Remove manometer from
pressure tap and replace pipe plug on gas valve. Turn on
gas to unit and check for leaks.

Heating
1. Purge gas supply line of air by opening union ahead of
gas valve. When gas odor is detected, tighten union and
wait 5 minutes before proceeding.
2. Turn on electrical supply and open manual gas valve.
3. Set system switch selector at HEAT position and fan
switch at AUTO. or ON position. Set heating temperature
lever above room temperature.
4. The induced-draft motor will start, purging heat
exchangers.

Cooling — To start unit, turn on main power supply. Set
system selector switch at COOL position and fan switch at
AUTO. position. Adjust thermostat to a setting below room
temperature. Compressor, indoor and outdoor fans start on closure of contactors.
Check unit charge. Refer to Refrigerant Charge section,
page 37. Unit must operate a minimum of 15 minutes before
adjusting charge.
Reset thermostat at a position above room temperature.
Compressor and outdoor fans will shut off. Evaporator fan will
shut off after 30-second delay.
34

Safety Relief — A soft-solder joint at the suction line

5. After a call for heating, the main burners should light
within 5 seconds. If the burners do not light, then there is
a 22-second delay before another 5-second ignition try.
If the burners still do not light, the time delay is repeated.
If the burners do not light within 15 minutes, there is a
lockout. To reset the control, break the 24 v power to W1.
6. The evaporator-fan motor will turn on 45 seconds after
the burners are ignited.
7. The evaporator-fan motor will turn off 45 seconds after
the thermostat temperature is satisfied.
8. Adjust airflow to obtain a temperature rise within the
range specified on the unit nameplate and in Table 1A
or 1B.

Schrader port provides pressure relief under abnormal temperature and pressure conditions.

Ventilation (Continuous Fan) — Set fan and system
selector switches at ON and OFF positions, respectively.
Evaporator fan operates continuously to provide constant air
circulation. When the evaporator-fan selector switch is turned
to the OFF position, there is a 30-second delay before the fan
turns off.
Operating Sequence
COOLING, UNITS WITHOUT ECONOMIZER — When
thermostat calls for cooling, terminals G and Y1 are energized.
The indoor (evaporator) fan contactor (IFC) and compressor
contactor no. 1 (C1) are energized, and evaporator-fan motors,
compressor no. 1, and both condenser fans start. The condenserfan motor runs 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 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 DURABLADE ECONOMIZER — When the outdoor-air temperature is above the
OAT (outdoor-air thermostat) setting and the room thermostat
calls for cooling, compressor contactor no. 1 is energized to
start compressor no. 1 and the outdoor (condenser) fan motor
(OFM). The indoor (evaporator) fan motor (IFM) is energized
and the economizer damper moves to the minimum position.
Upon a further call for cooling, compressor contactor no. 2 will
be energized, starting compressor no. 2. After the thermostat is
satisfied, the damper moves to the fully closed position when
using an auto fan or to the minimum position when using a
continuous fan.
When the outdoor-air temperature is below the OAT setting
and the thermostat calls for cooling, the economizer dampers
move to the minimum position. If the supply-air temperature is
above 14 C (57 F), the damper continues to open until it reaches the fully open position or until the supply-air temperature
drops below 11 C (52 F).
When the supply-air temperature falls to between 14 C
(57 F) and 11 C (52 F), the damper will remain at an intermediate open position. If the supply-air temperature falls below
11 C (52 F), the damper will modulate closed until it reaches
the minimum position or until the supply-air temperature is
above 11 C (52 F). When the thermostat is satisfied, the damper will move to the fully closed position when using an auto fan
or to the minimum position when using a continuous fan.

Table 24 — Altitude Compensation*

ELEVATION
m or km
(ft)

0-610 m (0-2,000)
610 m (2,000)
914 m (3,000)
1.22 km (4,000)
1.52 km (5,000)
1.83 km (6,000)
2.13 km (7,000)
2.44 km (8,000)
2.74 km (9,000)
3.05 km (10,000)
3.35 km (11,000)
3.66 km (12,000)
3.96 km (13,000)
4.27 km (14,000)

31.4, 50.4, AND 59.8 kW
(107,000, 172,000 AND
204,000 BTUH
NOMINAL INPUT
Natural
Liquid
Gas
Propane
Orifice
Orifice
Size†
Size†
3.0 (31)
2.4 (41)
2.9 (32)
2.3 (42)
2.9 (32)
2.3 (42)
2.9 (32)
2.3 (42)
2.8 (33)
2.2 (43)
2.8 (34)
2.2 (43)
2.8 (35)
2.1 (44)
2.7 (36)
2.1 (44)
2.6 (37)
2.0 (45)
2.5 (38)
2.0 (46)
2.5 (39)
1.9 (47)
2.4 (40)
1.9 (47)
2.4 (41)
1.9 (48)
2.3 (42)
1.9 (48)

65.6 kW
(224,000 BTUH)
NOMINAL INPUT
Natural Liquid
Gas
Propane
Orifice Orifice
Size†
Size†
3.2 (30) 2.5 (38)
3.2 (30) 2.5 (39)
3.0 (31) 2.4 (40)
2.9 (32) 2.4 (41)
2.8 (33) 2.3 (42)
2.8 (34) 2.2 (43)
2.8 (35) 2.2 (43)
2.7 (36) 2.1 (44)
2.6 (37) 2.1 (44)
2.5 (38) 2.0 (45)
2.5 (39) 2.0 (45)
2.4 (40) 2.0 (46)
2.4 (41) 1.9 (47)
2.3 (42) 1.9 (47)

*As the height above sea level increases, there is less oxygen.
Therefore, heat input rate should be reduced at higher altitudes.
†Orifice available through your local distributor.

Integrated Gas Controller (IGC) Operation
NOTE: The default value for the evaporator-fan motor ON and
OFF delay is 45 seconds. The Integrated Gas Controller (IGC)
modifies this value when abnormal limit switch cycles occur.
Based upon unit operating conditions, the ON delay can be
reduced to 0 seconds and the OFF delay can be extended to
180 seconds.
When one flash of the LED (light-emitting diode) is observed, the evaporator-fan ON/OFF delay has been modified.
If the limit switch trips at the start of the heating cycle during
the evaporator ON delay, the time period of the ON delay for
the next cycle will be 5 seconds less than the time at which the
switch tripped. (Example: If the limit switch trips at 30 seconds, the evaporator-fan ON delay for the next cycle will occur
at 25 seconds.) To prevent short-cycling, a 5-second reduction
will only occur if a minimum of 10 minutes has elapsed since
the last call for heating.
The evaporator-fan OFF delay can also be modified. Once
the call for heating has ended, there is a 10-minute period during which the modification can occur. If the limit switch trips
during this period, the evaporator-fan OFF delay will increase
by 15 seconds on the next cycle. A maximum of 9 trips can occur, extending the evaporator-fan OFF delay to 180 seconds.
To restore the original default value, reset the power to the unit.
TO SHUT OFF UNIT — Set system selector switch at OFF
position. Resetting heating selector lever below room temperature will shut unit off temporarily until space temperature falls
below thermostat setting.
35

SERVICE

If the outdoor air alone cannot satisfy the cooling requirements of the conditioned space, economizer cooling is integrated with mechanical cooling, providing second-stage cooling.
Compressor no. 1 and the condenser fan will be energized and
the position of the economizer damper will be determined by
the supply-air temperature. Compressor no. 2 is locked out.
When the second stage of cooling is satisfied, the compressor and OFM will be deenergized. The damper position will be
determined by the supply-air temperature.
After a 30-second delay, the IFM shuts off. If the thermostat
fan selector switch is in the ON position, the IFM will run
continuously.
COOLING UNITS WITH ECONOMI$ER — When the
OAT is above the ECON SP set point and the room thermostat
calls for Stage 1 cooling (R to G + Y1), the indoor fan motor
(IFM) is energized and the EconoMi$er damper modulates to
minimum position. The compressor contactor is energized to
start the compressor and outdoor-fan motor (OFM). After the
thermostat is satisfied, the damper modulates to the fully closed
position when the IFM is deenergized.
When the OAT is below the ECON SP setting and the room
thermostat calls for Stage 1 cooling (R to G + Y1), the
EconoMi$er modulates to the minimum position when the
IFM is energized. The EconoMi$er provides Stage 1 of cooling
by modulating the return and outdoor air dampers to maintain a
13 C (55 F) supply air set point. If the supply-air temperature
(SAT) is greater than 14 C (57 F), the EconoMi$er modulates
open, allowing a greater amount of outdoor air to enter the unit.
If the SAT drops below 12 C (53 F), the outdoor air damper
modulates closed to reduce the amount of outdoor air. When
the SAT is between 12 C (53 F) and 14 C (57 F), the
EconoMi$er maintains its position.
If outdoor air alone cannot satisfy the cooling requirements
of the conditioned space, and the OAT is above the MECH
CLG LOCKOUT set point, the EconoMi$er integrates free
cooling with mechanical cooling. This is accomplished by the
strategies below.
NOTE: Compressors have a two-minute Minimum On, Minimum Off, and interstage delay timer.
1. If Y1 is energized, and the room thermostat calls for Y2
(2-stage thermostat), the compressor and OFM are energized. The position of the EconoMi$er damper is maintained at its current value.
2. If Y1 is energized for more than 20 minutes, and Y2 is
not energized (whether or not a 2-stage thermostat is
used), the compressor and OFM are energized. The position of the EconoMi$er damper is maintained at its current value.
3. If Y1 is energized, and compressor no. 1 is already energized (see Step 2) and the room thermostat calls for Y2,
compressor no. 1 continues to operate. If Y2 remains
energized for more than 20 minutes, compressor no. 2 is
energized.
NOTE: Compressor no. 2 cannot be energized unless there is a
signal for Y2 from the space thermostat.
4. If compressor no. 2 is energized, and the Y2 signal from
the thermostat is satisfied, compressors 1 and 2 are deenergized. Re-asserting Y2 will start compressor no. 1 and
(after a 20-minute interstage delay) compressor no. 2.
5. If compressor no. 1 is energized and the thermostat is satisfied, compressor no. 1, the OFM, and IFM are deenergized and the EconoMi$er modulates closed.
When the OAT is below the MECH CLG LOCKOUT set
point, the compressors remain off.

When servicing unit, shut off all electrical power to unit to
avoid shock hazard or injury from rotating parts.

Cleaning — Inspect unit interior at the beginning of each
heating and cooling season or more frequently as operating
conditions require.
EVAPORATOR COIL — Clean coil as required. Inspect coil
at beginning of heating and cooling seasons.
1. Turn unit power off. Remove evaporator coil access panel.
2. If economizer is installed, remove economizer by disconnecting Molex plug and removing economizer mounting
screws. Refer to Accessory Economizer Installation Instructions or Optional Economizer sections on pages 12
and 15 for more details.
3. Remove filters from unit.
4. Clean coil using a commercial coil cleaner or dishwasher
detergent in a pressurized spray canister. Wash both sides
of coil and flush with clean water. For best results, backflush toward return-air section to remove foreign material. Caution should be taken as to not overflow the evaporator drain condensate pan.
5. Flush condensate pan after completion.
6. Reinstall economizer and filters.
7. Reconnect wiring.
8. Replace access panels.
CONDENSER COIL — Inspect coil monthly. Clean condenser coil annually, and as required by location and outdoorair conditions.
One-Row Coils — Wash coil with commercial cleaner. Clean
outer surfaces with a stiff brush in the normal manner. It is not
necessary to remove top panel.
2-Row Coils — Clean coil as follows:
1. Turn off unit power.
2. Remove top panel screws on condenser end of unit.
3. Remove condenser coil corner post. See Fig. 45. To hold
top panel open, place coil corner post between top panel
and center post. See Fig. 46.
4. Remove screws securing coil to center post.
5. Remove fastener holding coil sections together at return
end of condenser coil. Carefully separate the outer coil
section 3 to 4 in. from the inner coil section. See Fig. 47.
6. Use a water hose or other suitable equipment to flush
down between the 2 coil sections to remove dirt and debris. Clean the outer surfaces with a stiff brush in the normal manner.
7. Secure inner and outer coil rows together with a fieldsupplied fastener.
8. Reposition the outer coil section and remove the coil corner post from between the top panel and center post.
9. Reinstall the coil corner post and replace all screws.
CONDENSATE DRAIN — Check and clean each year at
start of cooling season. In winter, keep drain dry or protect
against freeze-up.
FILTERS — Clean or replace at start of each heating and cooling season, or more often if operating conditions require it. Replacement filters must be same dimensions as original filters.
BELTS — Adjust belt tension and pulley alignment at least
twice a year or more frequently as operating conditions require.
Refer to Step 9 — Adjust Evaporator for Fan Speed
for procedures.
36

Lubrication
COMPRESSORS — Each compressor is charged with the
correct amount of oil at the factory.
FAN-MOTOR BEARINGS — Fan-motor bearings are of
the permanently lubricated type. No further lubrication is required. No lubrication of condenser- or evaporator-fan motors
is required.

Condenser-Fan Adjustment (Fig. 48)
1. Shut off unit power supply and tag disconnect.
2. Remove condenser-fan assembly (grille, motor, motor
cover, and fan) and loosen fan hub setscrews.
3. Adjust fan height as shown in Fig. 48.
4. Tighten setscrews and replace condenser-fan assembly.
Fig. 45 — Cleaning Condenser Coil

48TF UNIT VOLTAGE
400 V

FAN HEIGHT “A” (in.)
89 (3.50)

Fig. 48 — Condenser-Fan Adjustment

Manual Outdoor-Air Damper — If outdoor-air damper blade is required, see Manual Outdoor-Air Damper section on
page 12.
Economizer Adjustment — Refer to Optional Durablade Economizer section on page 14.

Condenser Coil Grille — Condenser coil grille is
shipped factory-installed. No adjustments are required.

Fig. 46 — Propping Up Top Panel

Refrigerant Charge — Amount of refrigerant charge is
listed on unit nameplate (also refer to Tables 1A and 1B). Refer
to Carrier GTAC 2-5 Charging, Recovery, recycling, and reclamation training manual and the following procedures.
Unit panels must be in place when unit is operating during
charging procedure.
NO CHARGE — Use standard evacuating techniques. After
evacuating system, weigh in the specified amount of refrigerant (refer to Tables 1A and 1B).
LOW CHARGE COOLING — Using the Cooling Charging
Charts, Fig. 49-51 vary refrigerant until the conditions of the
appropriate chart are met. Note the charging charts are different from the type normally used. The charts are based on
charging the units to the correct superheat for the various operating conditions. Accurate pressure gage and temperature sensing device are required. Connect the pressure gage to the
service port on the suction line. Mount the temperature sensing
device on the suction line and insulate it so that outdoor ambient temperature does not affect the reading. Indoor-air cfm
must be within the normal operating range of the unit.
TO USE COOLING CHARGING CHARTS — Take the outdoor ambient temperature and read the suction pressure gage.
Refer to appropriate chart to determine what suction temperature should be. If suction temperature is high, add refrigerant.
If suction temperature is low, carefully reclaim some of the
charge. Recheck the suction pressure as charge is adjusted.
Example (Fig. 51, Circuit 1):
Outdoor Temperature. . . . . . . . . . . . . . . . . . . . . . . . .13 C (55 F)
Suction Pressure. . . . . . . . . . . . . . . . . . . . . . . .483 kPa (70 psig)
Suction Temperature should be. . . . . . . . . . . . . . . . .23 C (74 F)
(Suction temperature may vary ± 3 C [5 F].)

Fig. 47 — Separating Coil Sections

37

Fig. 49 — Cooling Charging Charts, 48TF008 Units

Fig. 50 — Cooling Charging Charts, 48TF012 Units

38

CIRCUIT NO. 2

CIRCUIT NO. 1

Fig. 51 — Cooling Charging Chart; 48TF014 Units

Flue Gas Passageways — To inspect the flue collector box and upper areas of the heat exchanger:
1. Remove the combustion blower wheel and motor assembly according to directions in Combustion-Air Blower
section below.
2. Remove the flue cover to inspect the heat exchanger.
3. Clean all surfaces as required using a wire brush.

problems when the power supply is interrupted. When a break
in power occurs, the module will be reset (resulting in a loss of
fault history) and the indoor (evaporator) fan ON/OFF times
will be reset. For additional information, refer to the Start-Up,
Heating section on page 34. The LED error code can be observed through the viewport. During servicing refer to the label
on the control box cover or Table 25 for an explanation of LED
error code descriptions.
If lockout occurs, unit may be adjusted by interrupting power supply to unit for at least 5 seconds.

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 bimonthly to determine proper cleaning frequency.
To inspect blower wheel, shine a flashlight into draft hood
opening. If cleaning is required, remove motor and wheel as
follows:
1. Slide burner access panel out.
2. Remove the 6 screws that attach induced-draft motor
housing to vestibule plate (Fig. 52).
3. The blower wheel can be cleaned at this point. If additional cleaning is required, continue with Steps 4 and 5.
4. To remove blower from the motor shaft, remove
2 setscrews.
5. To remove motor, remove the 4 screws that hold blower
housing to mounting plate. Remove the motor cooling fan
by removing one setscrew. Then remove nuts that hold
motor to mounting plate.
6. To reinstall, reverse the procedure outlined above.

Table 25 — LED Error Code Description*
LED INDICATION
ON
OFF
1 Flash†
2 Flashes
3 Flashes
4 Flashes
5 Flashes
6 Flashes
7 Flashes
8 Flashes
9 Flashes**

ERROR CODE DESCRIPTION
Normal Operation
Hardware Failure
Evaporator Fan On/Off Delay Modified
Limit Switch Fault
Flame Sense Fault
4 Consecutive Limit Switch Faults
Ignition Lockout Fault
Induced-Draft Motor Fault
Rollout Switch Fault
Internal Control Fault
Temporary 1 hour automatic reset fault

LEGEND
LED — Light-Emitting Diode
*A 3-second pause exists between LED error code flashes. If more
than one error code exists, all applicable codes will be displayed in
numerical sequence.
†Indicates a code that is not an error. The unit will continue to operate when this code is displayed.
**Indicates internal processor fault and will reset itself in 1 hour.

Limit Switch — Remove blower access panel (Fig. 6).
Limit switch is located on the fan deck.

Burner Ignition — Unit is equipped with a direct spark
ignition 100% lockout system. Integrated Gas Unit Controller
(IGC) is located in the control box (Fig. 11). Module contains a
self-diagnostic LED (light-emitting diode). A single LED on
the IGC provides a visual display of operational or sequential

IMPORTANT: Refer to Troubleshooting Tables 26-30 for additional information.

39

Main Burners — At the beginning of each heating season, inspect for deterioration, blockage due to corrosion or other causes. Observe the main burner flames and replace burners
if necessary.

INDUCEDDRAFT
MOTOR
MOUNTING
PLATE

ROLLOUT
SWITCH

When working on gas train, do not hit or plug orifice
spuds.
BURNER
SECTION

REMOVAL AND REPLACEMENT OF GAS TRAIN
(Fig. 52 and 53)
1. Shut off manual gas valve.
2. Shut off power to unit and tag disconnect.
3. Slide out burner section side panel (not shown).
4. Disconnect gas piping at unit gas valve.
5. Remove wires connected to gas valve. Mark each wire.
6. Remove wires from ignitor and sensor wires at the Integrated Gas Unit Controller (IGC).
7. Remove the 2 screws that attach the burner rack to the
vestibule plate.
8. Slide the burner tray out of the unit (Fig. 53).
9. To reinstall, reverse the procedure outlined above.
CLEANING AND ADJUSTMENT
1. Remove burner rack from unit as described in Removal
and Replacement of Gas Train section on this page.
2. Inspect burners; if dirty, remove burners from rack.
3. Using a soft brush, clean burners and cross-over port as
required.
4. Adjust spark gap. See Fig. 54.
5. Reinstall burners on rack.
6. Reinstall burner rack as described in Removal and Replacement of Gas Train section.

FLUE
EXHAUST
VESTIBULE
PLATE

INDUCEDDRAFT
MOTOR

BLOWER
HOUSING

MANIFOLD
PRESSURE
TAP

GAS
VALVE

Fig. 52 — Burner Section Details

Fig. 53 — Burner Tray Details

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

40

48TFD008
31.4/21.1 kW INPUT (107,000/72,000 BTUH)

48TFE008, 48TFD012
50.4/31.9 kW INPUT/ (172,000/109,000 BTUH)

48TFD014, 48TFE012, 48TFF008
59.8/39.8 kW INPUT
(204,000/136,000 BTUH)
48TFE014, 48TFF012
65.6/43.9 kW INPUT
(224,000/150,000 BTUH)

NOTE: Dimensions in (

) are millimeters.

Fig. 54 — Spark Gap Adjustment

41

TROUBLESHOOTING
Table 26 — LED Error Code Service Analysis
PROBLEM
Hardware failure.
(LED OFF)

CAUSE
Loss of power to control module (IGC).

REMEDY
Check 5- amp fuse on IGC, power to unit, 24-v circuit breaker,
and transformer. Units without a 24-v circuit breaker have an
internal overload in the 24-v transformer. If the overload trips,
allow 10 minutes for automatic reset.
High temperature limit switch is open.
Check the operation of the indoor (evaporator) fan motor.
Limit switch fault.
Ensure that the supply-air temperature rise is in accordance with
(LED 2 flashes)
the range on the unit nameplate.
The IGC sensed flame that should not be Reset unit. If problem persists, replace control board.
Flame sense fault.
present.
(LED 3 flashes)
Check operation of indoor (evaporator) fan motor and that supply-air
4 consecutive limit switch trips. Inadequate airflow to unit.
temperature rise agrees with range on unit nameplate information.
(LED 4 flashes)
Unit unsuccessfully attempted ignition for Check ignitor and flame sensor electrode spacing, gaps, etc.
Ignition lockout.
15 minutes.
Ensure that flame sense and ignition wires are properly termi(LED 5 flashes)
nated. Verify that unit is obtaining proper amount of gas.
IGC does not sense that induced-draft
Check for proper voltage. If motor is operating, check the
Induced-draft motor fault.
motor is operating.
speed sensor plug/IGC Terminal J2 connection. Proper
(LED 6 flashes)
connection: PIN 1— White, PIN 2 — Red, PIN 3 — Black.
Rollout switch has opened.
Rollout switch will automatically reset, but IGC will continue to
Rollout switch fault.
lock out unit. Check gas valve operation. Ensure that induced(LED 7 flashes)
draft blower wheel is properly secured to motor shaft. Reset unit
at unit disconnect.
Microprocessor has sensed an error in
If error code is not cleared by resetting unit power, replace the
Internal control fault.
the software or hardware.
IGC.
(LED 8 flashes)
Processor will be reset after 1 hour.
Temporary 1 hour automatic reset Stray radio frequency signals in ??
fault. (LED 9 flashes)
LEGEND
IGC — Integrated Gas Unit Controller
LED — Light-Emitting Diode

IMPORTANT: Refer to Table 28 — Heating Service Troubleshooting for additional troubleshooting information.

If the IGC must be replaced, be sure to ground yourself to dissipate any electrical charge that may be present before handling
new control board. The IGC is sensitive to static electricity and
may be damaged if the necessary precautions are not taken.

42

Table 27 — Cooling Service Troubleshooting
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.

Compressor no. 2 will not run.
Compressor makes excessive
noise (48TF014 scroll only).

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.
Faulty wiring or loose connections in compressor circuit.
Compressor motor burned out, seized, or
internal overload open.
Defective run/start capacitor, overload, or
start relay.
One leg of 3-phase power dead.
Refrigerant overcharge or undercharge.
Defective compressor.
Insufficient line voltage.
Blocked condenser.
Defective run/start capacitor, overload, or
start relay.
Defective thermostat.
Faulty condenser-fan motor or capacitor.
Restriction in refrigerant system.
Dirty air filter.
Unit undersized for load.
Thermostat set too low.
Low refrigerant charge.
Leaking valves in compressor.
Air in system.
Condenser coil dirty or restricted.
Dirty air filter.
Dirty condenser coil.
Refrigerant overcharged.
Air in system.
Condenser air restricted or air short-cycling.
Low refrigerant charge.
Compressor valves leaking.
Restriction in liquid tube.
High heat load.
Compressor valves leaking.
Refrigerant overcharged.
Dirty air filter.
Low refrigerant charge.
Metering device or low side restricted.
Insufficient evaporator airflow.
Temperature too low in conditioned area.
Field-installed filter drier restricted.
Unit in economizer mode.
Compressor rotating in wrong direction.

43

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.
Check wiring and repair or replace.
Determine cause. Replace compressor.
Determine cause and replace.
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.
Replace compressor.
Recover refrigerant, evacuate system, and
recharge.
Clean coil or remove restriction.
Replace filter.
Clean coil.
Remove excess refrigerant.
Recover refrigerant, evacuate system, and
recharge.
Determine cause and correct.
Check for leaks, repair, and recharge.
Replace compressor.
Remove restriction.
Check for source and eliminate.
Replace compressor.
Recover excess refrigerant.
Replace filter.
Check for leaks, repair, and recharge.
Remove source of restriction.
Increase air quantity. Check filter and replace if
necessary.
Reset thermostat.
Replace.
Proper operation; no remedy necessary.
Reverse the 3-phase power load as described in
Start-Up, Compressor Rotation section on
page 34.

Table 28 — Heating Service Troubleshooting
PROBLEM
Burners will not
ignite.

Inadequate heating.

Poor flame
characteristics.

Burners will not
turn off.

CAUSE
Misaligned spark electrodes.

REMEDY
Check flame ignition and sensor electrode positioning.
Adjust as needed.
No gas at main burners.
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.
Water in gas line.
Drain water and install drip leg to trap water.
No power to furnace.
Check power supply, fuses, wiring, and circuit breaker.
No 24 v power supply to control circuit.
Check transformer. Transformers with internal overcurrent
protection require a cool down period before resetting.
Miswired or loose connections.
Check all wiring and wirenut connections.
Burned-out heat anticipator in thermostat.
Replace thermostat.
Broken thermostat wires.
Run continuity check. Replace wires, if necessary.
Dirty air filter.
Clean or replace filter as necessary.
Gas input to unit too low.
Check gas pressure at manifold. Clock gas meter for input. If too
low, increase manifold pressure, or replace with correct orifices.
Unit undersized for application.
Replace with proper unit or add additional unit.
Restricted airflow.
Clean filter, replace filter, or remove any restrictions.
Blower speed too low.
Use high speed tap, increase fan speed, or install optional
blower, as suitable for individual units.
Limit switch cycles main burners.
Check rotation of blower, thermostat heat anticipator settings,
and temperature rise of unit. Adjust as needed.
Too much outdoor air.
Adjust minimum position.
Check economizer operation.
Incomplete combustion (lack of
Check all screws around flue outlets and burner compartment.
combustion air) results in:
Tighten as necessary.
Aldehyde odors, CO, sooting flame, or floating flame. 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.
Unit is locked into Heating mode for a
Wait until mandatory one minute time period has
one minute minimum.
elapsed or power to unit.

Table 29 — EconoMi$er Troubleshooting
PROBLEM
Damper Does Not
Open

POTENTIAL CAUSE
Indoor (Evaporator) Fan is Off

REMEDY
Check to ensure that 24 vac is present at Terminal C1 (Common Power)
on the IFC (Indoor [Evaporator] Fan Contactor) or that 24 vac is present at
the IFO (Indoor [Evaporator] Fan On) terminal. Check whether 24 vac is
present at PL6-1 (red wire) and/or PL6-3 (black wire). If 24 vac is not
present, check wiring (see unit label diagram).
Check proper thermostat connection to G on the connection board.
Check to ensure that 24 vac is present across Terminals 24 VAC and
24 V COM on the EconoMi$er control. If 24 vac is not present, check wiring
(see unit label diagram). If 24 vac is present, STATUS light should be on
constantly.
If IFM is on, check to ensure 24 vac is present on G Terminal of the
EconoMi$er controller. If 24 vac is not present, check wiring (see unit
label diagram).
If STATUS light is flashing one flash, the EconoMi$er controller is
experiencing a fault condition. Cycle power to the controller. If condition
continues, replace the EconoMi$er controller.
If STATUS light is flashing two flashes, the EconoMi$er controller senses
the thermostat is wired incorrectly. Check wiring between the thermostat
and the connection board in the electrical panel. The fault condition is
caused by Y2 being energized before Y1.
Check the wiring between the EconoMi$er controller and the actuator.
Hold CONFIG button between 3 and 10 seconds to verify the
actuator’s operation. (This process takes 3 minutes to complete.)
Verify that the MIN POS (%) is set greater than zero. Adjust MIN POS (%)
to 100% to verify operation, and then set to correct setting.
Set at correct value. See Table 4.

No Power to EconoMi$er Controller

No Power to G Terminal
Controller Fault
Thermostat Fault

Actuator Fault

EconoMi$er
Operation Limited to
Minimum Position

Minimum Position Set Incorrectly
EconoMi$er Changeover Set Point Set Too
High or Too Low
Supply Air Temperature Sensor Faulty

If STATUS light is flashing 4 flashes, Supply Air Temperature Sensor is
faulty. Check wiring or replace sensor.
If STATUS light is flashing 5 flashes, Outdoor Air Temperature Sensor is
faulty. Check wiring or replace sensor.
The supply-air temperature is less than 7 C (45 F), causing the minimum
position to be decreased. Refer to the Start-Up instructions. Verify correct
setting of MIN POS (%). If correct, EconoMi$er is operating correctly.
If a CO2 sensor is being used, and the damper position is greater than
minimum position, the ventilation control strategy is controlling. Refer to
the Start-Up instructions. EconoMi$er is operating correctly.
Check to ensure the damper is not blocked.

Outdoor Air Temperature Sensor Faulty
Damper Position
Less than Minimum
Position Set Point
Damper Does Not
Return to Minimum
Position
Damper Does Not
Close on Power Loss

Supply Air Low Limit Strategy Controlling
CO2 Ventilation Strategy Controlling
Damper Travel is Restricted

LEGEND
IFM — Indoor Fan Motor
PL — Plug

44

Table 30 — Durablade Economizer Troubleshooting
PROBLEM
Damper does not
open.

Economizer
operation
limited to minimum
position.

Damper does not
close.

Economizer damper
does not close on
power loss.

C1
EC
IFC
IFO

—
—
—
—

CAUSE
Indoor (evaporator) fan is off.

REMEDY
1. Check to ensure that 24 vac is present at terminal C1 on the IFC or
that 24 vac is present at the IFO terminal. Check whether 24 vac is
present at PL6-1 (red wire) and/or PL6-3 (black wire). If 24 vac is
not present, check wiring (see unit label diagram).
2. Check proper thermostat connection to G on the connection board.
No power to economizer motor.
1. Check that SW3 is properly making contact with the damper
blade. Check that SW1 is in the NC (normally closed) position.
2. Check diode D1. If diode is not functioning properly, replace D1.
3. Confirm that the economizer control board is grounded properly at
PL6-4 (brown wire) and at brown terminal of the economizer control
board (brown wire). The economizer motor must also be grounded
properly at the negative motor terminal (brown wire).
4. Verify SW1 and SW3 are working and wired properly (see unit label
diagram).
5. Check for 24 vac input at both PL6-1 (red wire) and PL6-3 (black
wire). If 24 vac not present, check unit wiring (see unit label diagram). If 24 vac is found in both places, check for 24 vac at the
yellow terminal of the economizer control board (yellow wire). If
24 vac power is not present, replace the economizer control board.
Economizer motor failure.
If the indoor (evaporator) fan and economizer motor are energized,
verify that there is a minimum of 18 vdc at the positive motor
terminal. If the motor is not operating, replace the motor.
OAT or EC set too high.
1. Set at correct temperature (1.7 C [3 F] below indoor space
temperature).
2. Check OAT or EC by setting above outdoor temperature or humidity
level. If the OAT or EC switches do not close, replace OAT or EC.
Verify economizer control board is 1. Perform the following tests when OAT or EC is closed, Y1 is called
correctly wired and works properly.
for and damper is at minimum position. Confirm 24 vac on gray terminal of the economizer control board (gray wire). If 24 vac is not
present, check wiring (see unit label diagram).
2. Verify that SW1 and SW3 are wired correctly and working properly
(see unit label diagram).
3. Check to ensure that 24 vac exists at PL6-2 (blue wire). If
24 vac is not present, check wiring (see unit wiring label diagram).
4. Check 24 vac output at PL6-10 (white wire). If 24 vac is not
present, replace economizer control board.
Check SAT.
1. After verifying that the OAT and EC settings and the economizer
control board wiring are correct, check to ensure that the 24 vac
terminal of the SAT has 24 vac (white wire). If OAT, EC, and control
board are functioning and wired properly and no 24 vac exists,
check wiring (see unit label diagram).
2. If supply-air temperature is greater than 14 C (57 F), 24 vac should
be found at terminal T2 on the SAT (pink wire). If 24 vac is not
present, replace SAT.
Incorrect wiring of economizer.
1. Verify that SW2 and SW4 are wired and working properly (see unit
label diagram).
2. Check diode D2. If diode is not functioning properly, replace D2.
Verify economizer control board is 1. After verifying that the wiring is correct, modulate the damper to the
functioning properly.
minimum position. Remove the call for G (evaporator fan).
2. If the damper does not move, check for 24 vac at PL6-1 (red wire).
If 24 vac is not present, check wiring (see unit label diagram).
3. If damper still does not move, check for 24 vac at blue terminal of
economizer control board (blue wire). If 24 vac is not present,
replace the economizer circuit board.
Check SAT.
1. After verifying that the wiring is correct and the economizer control
board is functioning properly, place the OAT or EC switch in the
closed position. Place a call for Y1 and open the damper to the fully
open position. Confirm that the 24 vac terminal of the SAT has
24 vac (white wire). If 24 vac is not present, check wiring (see unit
label diagram).
2. If supply-air temperature is less than 11 C (52 F), 24 vac should be
found at terminal T1 on the SAT (violet wire). If 24 vac not found,
replace SAT.
Economizer motor failure.
If economizer control board and SAT are functioning properly, verify
that there is a minimum of 18 vdc at the positive motor terminal. If a
minimum if 18 vdc is present and the motor is still not operating,
replace the motor.
Verify that close-on-power-loss and 1. Check voltage potential across batteries. If lower than 14 vdc,
economizer control board are funcreplace close-on-power-loss power supply (9-v alkaline batteries). It
tioning properly.
is recommended that you check this emergency power supply on a
regular basis or whenever the filters are changed.
2. If the close-on-power-loss and economizer control board are functioning properly, check for 14 vdc or higher at the blue terminal of
the economizer control board (blue wire) when power is disconnected from unit. If 14 vdc is not present, replace the control board.

LEGEND
Common Power
Enthalpy Control
Indoor (Evaporator) Fan Contactor
Indoor (Evaporator) Fan On

OAT
PL
SAT
SW

—
—
—
—

Outdoor-Air Thermostat
Plug
Supply-Air Thermostat
Economizer Position Switch

45

LEGEND
— Adjustable Heat Anticipator
— Blower Relay
— Contactor, Compressor
— Capacitor
— Circuit Breaker
— Cooling Compensator
— Compressor Motor
— Combustion Relay
— Diode
— Enthalpy Control
— Economizer
— Emergency Power Supply
(9-Volt Battery)
EQUIP — Equipment
ER
— Economizer Relay
FPT
— Freeze-Up Protection Thermostat
FSS
— Filter Status Sensor
GND
— Ground
GVR
— Gas Valve Relay
HPS
— High-Pressure Switch
HS
— Hall-Effect Sensor
I
— Ignitor
IDM
— Induced-Draft Motor
IFC
— Indoor-Fan Contactor
IFM
— Indoor Fan Motor
IGC
— Integrated Gas Unit Controller
LPS
— Low-Pressure Switch
LS
— Limit Switch
MGV
— Main Gas Valve
MTR
— Motor
OAT
— Outdoor-Air Thermostat
OFM
— Outdoor-Fan Motor
P
— Plug
PL
— Plug Assembly
QT
— Quadruple Terminal
R
— Relay
RS
— Rollout Switch
SAT
— Supply-Air Thermostat
SEN
— Sensor
SW1
— Switch Fully Open
SW2
— Switch Fully Closed
SW3
— Switch Min. Vent Position
SW4
— Switch Max. Vent Position
TC
— Thermostat-Cooling
TH
— Thermostat-Heating
TRAN — Transformer
AHA
BR
C
CAP
CB
CC
COMP
CR
D
EC
ECON
EPS

Field Splice
Marked Wire
Terminal (Marked)
Terminal (Unmarked)
Terminal Block
Splice
Splice (Marked)
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
To indicate common potential
only. Not to represent wiring.

NOTES:
1. If any of the original wire furnished must be replaced, it must be
replaced with Type 90 C wire or its equivalent.
2. Three-phase motors are protected under primary single phasing
conditions.
Thermostat: HH07AT170, 172, 174 and P272-2783
Subbase:
HH93AZ176, 178 and P272-1882, 1883
3. Set heat anticipator for first stage at 0.14 amp, second stage at
0.2 amp, except for 008 low heat, set both first and second stage at
0.14 amp.
4. Use copper conductors only.

Fig. 55 — Typical Unit Wiring Schematic
Copyright 2001 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 004-816
Printed in U.S.A.
Form 48TF-C1SI
Pg 46
1-01
Replaces: New
Book 1 4
Tab 1a 6a

I.

PRELIMINARY INFORMATION
MODEL NO.:________________________________

SERIAL NO.: ___________________________________

DATE:______________________________________

TECHNICIAN: __________________________________
JOB LOCATION: _______________________________

II. PRE-START-UP (insert checkmark in box as each item is completed)

 VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT
 REMOVE ALL SHIPPING HOLDDOWN BOLTS AND BRACKETS PER INSTALLATION INSTRUCTIONS
 VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS
 CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS
 CHECK GAS PIPING FOR LEAKS
 CHECK THAT INDOOR-AIR FILTERS ARE CLEAN AND IN PLACE
 VERIFY THAT UNIT INSTALLATION IS LEVEL
 CHECK FAN WHEELS AND PROPELLERS FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW TIGHTNESS
AND DRIVE BELTS TENSION.

III. START-UP
ELECTRICAL
SUPPLY VOLTAGE
COMPRESSOR AMPS
COMPRESSOR AMPS
INDOOR-FAN AMPS

L1-L2
L1
L1
L1

L2-L3
L2
L2
L2

L3-L1
L3
L3
L3

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

DB
DB
DB
DB

WB

PRESSURES
GAS INLET PRESSURE

kPa (IN. WG)

GAS MANIFOLD PRESSURE

kPa (IN. WG) (HI FIRE)

REFRIGERANT SUCTION

Pa (PSIG) — CIRCUIT NO. 1
Pa (PSIG) — CIRCUIT NO. 2

REFRIGERANT DISCHARGE

Pa (PSIG) — CIRCUIT NO. 1
Pa (PSIG) — CIRCUIT NO. 2

 VERIFY REFRIGERANT CHARGE USING CHARGING TABLES
 VERIFY THAT 3-PHASE SCROLL COMPRESSOR ROTATING IN CORRECT DIRECTION (014 ONLY)

Copyright 2001 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. 004-816
Printed in U.S.A.
Form 48TF-C1SI
Pg CL-1
1-01
Replaces: New
1a 6a

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START-UP CHECKLIST
(Remove and Store in Job File)
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