Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical components. Only trainedand 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. Wearsafety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire extinguishers available for all brazing operations.
48TJD008-014
48TJE008-014
48TJF008-012
Disconnect gas piping from unit when leak
testing at pressure greater than1⁄2psig. Pressures greater than1⁄2psig will cause gas
valve damage resulting in hazardous condition. If gas valve is subjected to pressure greater than1⁄2psig, it must be replaced
before use. When pressure testing fieldsupplied gas piping at pressures of1⁄2psig
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 offmain 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 insulationside down. Seals around duct openings must be tight. See
Fig. 1.
Step 1 — Provide Unit Support
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 is to be routed through the curb, attach the accessory
thru-the-curb service connection plate to the roof curb in accordance with the accessory installation instructions. Connection plate 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.
Book 1 4
Tab 1a 6a
PC 111Catalog No. 564-934Printed in U.S.A.Form 48TJ-13SIPg 19-96Replaces: 48TJ-10SI
Page 2
SLAB MOUNT (Horizontal Units Only) — Provide a level
concrete slab that extends a minimum of 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.
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, field-supplied 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 −.35 in. wg with
Durablade or PARABLADE economizer or .45 in. wg without economizer.
These units are designed for a minimum continuous returnair temperature of 50 F (dry bulb), or an intermittent operation down to 45 F (dry bulb), such as when used with a night
set-back thermostat.
Step 3 — Install External Trap for Condensate
Drain —
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 in the alternate bottom connection is tight before
installing the unit.
To use the bottom drain connection for a roof curb installation, relocate the factory-installed plug from the
The unit’s3⁄4-in. condensate drain connections
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 4-in. deep and protect against freezeup. See Fig. 5. If drain line is installed downstream from the
external trap, pitch the line away from the unit at 1 in. per
10 ft of run. Do not use a pipe size smaller than the unit
connection.
Step4 — Rig and Place Unit — Inspect unit for trans-
portation 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 Table 1 and Fig. 6 for additional information.
Operating weight is shown in Table 1 and Fig. 6.
Lifting holes are provided in base rails as shown in
Fig. 6 and 7. 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. 7.
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.
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:
rails on each side and front of unit; 15⁄32-in. clearance between roof curb and rear of unit. (See Fig. 2, section C-C.)
1
⁄4-in. clearance between roof curb and base
Fig. 1 — Horizontal Conversion Panels
2
Page 3
UNIT SIZE
48TJ
008-014 28-8
‘‘B’’‘‘C’’‘‘D’’ALT DRAIN HOLE
7
⁄169 [827] 18-1015⁄169 [583]13⁄49 [45]
‘‘E’’
GAS
3
⁄49 NPT3⁄49 NPT
3
⁄49 NPT11⁄49 NPT
POWER
CONNECTION
CONTROL
CONNECTION
1
⁄29 NPT
1
⁄29 NPT
CONNECTOR
ACCESSORY
PACKAGE
CRBTMPWR00A100
(THRU-THE-BOTTOM)
CRBTMPWR00A200
(THRU-THE-BOTTOM)
UNIT SIZE
48TJACCESSORY
008-014
NOTES:
1. Roof curb accessory is shipped unassembled.
2. Insulated panels.
3. Dimensions in [ ] are in millimeters.
4. Roof curb: galvanized steel.
5. Attach ductwork to curb (flanges of duct rest on
curb).
8. Either accessory connector package can be used
with either roof curb.
Fig. 2 — Roof Curb Details
3
Page 4
MAXIMUM ALLOWABLE
DIFFERENCE (in.)
A-BB-CA-C
0.51.01.0
Fig. 3 — Unit Leveling Tolerances
NOTE: Drain plug is shown in factory-installed position.
Fig. 4 — Condensate Drain Pan
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4-in. trap is recommended.
Fig. 5 — External Trap Condensate Drain
Locate mechanical draft system flue assembly at least
48 in. from any opening through which combustion products could enter the building, and at least 48 in. from an adjacent building or combustible material. When unit is located
adjacent to public walkways, flue assembly must be at least
7 ft above grade.
Flue vent discharge must have a minimum horizontal clearance of 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) Z223.1-latest year
and addendum Z223.1A-latest year. In Canada, installation
must be in accordance with the CAN1. B149.1 and
CAN1.B149.2 installation codes for gas burning appliances.
NOTES:
1. Dimension in ( ) is in millimeters.
2. Hook rigging shackles through holes in base rail as shown in detail ‘‘A.’’
Holesinbase rails arecentered around theunit center ofgravity. Usewooden
top skid when rigging to prevent rigging straps from damaging unit.
3. Weights include base unit without economizer. See Table1 for economizer
weights.
Rows...Fins/in.3...153...153...154...15
Total Face Area (sq ft)8.08.010.011.1
EVAPORATOR FANCentrifugal Type
Quantity...Size (in.)Std1...15 x 151...15 x 151...15 x 151...15 x 15
Type DriveStdBeltBeltBeltBelt
Nominal Cfm3000340040005000
Motor HpStd————
Maximum Continuous BhpStd2.402.402.404.20
Motor Frame SizeStd56565656
Nominal Rpm High/Low————
Fan Rpm RangeStd590-840685-935685-935860-1080
Motor Bearing TypeBallBallBallBall
Maximum Allowable Rpm2100210021002100
Motor Pulley Pitch Diameter Min/Max (in.)Std2.4/3.42.8/3.82.8/3.84.0/5.0
Nominal Motor Shaft Diameter (in.)Std
Fan Pulley Pitch Diameter (in.)Std7.07.07.08.0
Nominal Fan Shaft Diameter (in.)————
Belt, Quantity...Type...Length (in.)Std1...A...481...A...481...A...511...A...51
Pulley Center Line Distance (in.)Std16.75-19.2516.75-19.2515.85-17.5015.85-17.50
Speed Change per Full Turn ofStd50505044
Movable Pulley Flange (rpm)Alt50—5050
Movable Pulley Maximum Full TurnsStd5555
From Closed PositionAlt5—56
Factory SettingStd5555
Factory Speed Setting (rpm)Std590685685860
Fan Shaft Diameter at Pulley (in.)1111
Alt1...15 x 15—1...15 x 151...15 x 15
AltBelt—BeltBelt
4. On vertical discharge units, ductwork to be attached to accessory roof curb only.For
horizontal discharge units field-supplied flanges shouldbe attachedto horizontaldischarge 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, 48 inches.
b. Bottom of unit to combustible surfaces (when not using curb) 1 inch.
Bottom of base rail to combustible surfaces (when not using curb) 0 inches.
c. Condenser coil, for proper airflow, 36 in. one side, 12 in. the other. The side get-
ting the greater clearance is optional.
d. Overhead, 60 in. to assure proper condenser fan operation.
e. Between units, control box side, 42 in. per NEC (National Electrical Code).
f. Between unit and ungrounded surfaces, control box side, 36 in. per NEC.
g. Between unit and block or concrete walls and other grounded surfaces, control
box side, 42 in. 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 18-79 [483] up from the bottom of the base rail. Horizontal center of gravity is shown.
CONNECTION SIZES
3
⁄89 Dia [35] Field Power Supply Hole
A 1
1
⁄29 Dia [64] Power Supply Knock-Out
B 2-
3
⁄49 Dia [44] Charging Port Hole
C 1
7
⁄89 Dia [22] Field Control Wiring Hole
D
3
⁄49—14 NPT Condensate Drain
E
1
⁄29—14 NPT Gas Connection 48TJD008 & 009
3
⁄49—14 NPT Gas Connection 48TJE/F008 & 009;
F
48TJD/E012,014, 48TJF012
G 29 Dia [51] Power Supply Knock-Out
BOTTOM POWER CHART, THESE HOLES
REQUIRED FOR USE WITH ACCESSORY
PACKAGES — CRBTMPWR001A00,
OR CRBTMPWR002A00
THREADED
CONDUIT SIZE
1
⁄2(24 V
3
⁄4(Power*11⁄89 [28.4]
11⁄4(Power*13⁄49 [44.4]
*Select either
WIRE SIZE
3
⁄49 or 11⁄49 for power, depending on wire size.
REQUIRED HOLE
SIZES (MAX)
7
⁄89 [22.2]
Fig. 7 — Base Unit Dimensions
7
Page 8
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. 8.
Step 6 — Install Gas Piping — Unit is equipped for
use with type of gas shown on nameplate. Refer to local building codes, or in the absence of local codes, to ANSI Z223.1latest year and addendum Z223.1A-latest year entitled
National Fuel Gas Code. In Canada, installation must be in
accordance with the CAN1.B149.1 and CAN1.B149.2 installation codes for gas burning appliances.
For natural gas applications, gas pressure at unit gas connection must not be less than 4.0 in. wg (5.0 in. wg in high
heat units) or greater than 13.0 in. wg while unit is operating. For liquid propane applications, the gas pressure must
not be less than 5.0 in. wg or greater than 13.0 in. wg at the
unit connection.
Size gas supply piping for 0.5 in. wg maximum pressure drop. Do not use supply pipe smaller than unit gas
connection.
Support gas piping as shown in the table in Fig. 9. For
example, a
3
⁄4-in. gas pipe must have one field-fabricated support beam every 8 ft. Therefore, an 18-ft long gas pipe would
have a minimum of 2 support beams, and a 48-ft long pipe
would have a minimum of 6 support beams.
See Fig. 9 for typical pipe guide and locations of external
manual gas shutoff valve.
Step 7 — Make Electrical Connections
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, 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.
Fig. 8 — Flue Hood Details
LEGEND
NFGC — National Fuel Gas Code
*Field supplied.
NOTE: Follow all local codes.
SPACING OF SUPPORTS
STEEL PIPE
NOMINAL
DIAMETER
(in.)
1
⁄
2
3
⁄4or 18
1
⁄4or larger10
1
X
DIMENSION
(feet)
6
Fig. 9 — Gas Piping Guide (With Accessory
Thru-the-Curb Service Connections)
FIELD POWER SUPPLY— All units except 208/230-v units
are factory wired for the voltage shown on the nameplate. If
the 208/230-v unit is to be connected to a 208-v power supply, the transformer must be rewired by moving the black
wire from the 230-v red wire on the transformer and connecting it to the 200-v blue wire from the transformer. The
red wire then must be insulated.
Refer to unit label diagram for additional information. Pig-
tails are provided for field service.
When installing units, provide a disconnect per NEC. Use
copper conductors only when splice connectors are used.
All field wiring must comply with NEC and local requirements. In Canada, electrical connections must be in accordance with CSA (Canadian Standards Association) C22.1
Canadian Electrical Code Part One.
Install conduit through side panel openings indicated in
Fig. 7. Route power lines through connector to terminal connections as shown in Fig. 10.
On 3-phase units, 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. 7 for drilling holes in basepan.
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 50 ft, use no. 18 AWG (American Wire Gage) insulated wire (35 C minimum). For 50 to
75 ft, use no. 16 AWG insulated wire (35 C minimum). For
over 75 ft, use no. 14 AWGinsulated 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.
8
Page 9
Route thermostat cable or equivalent single leads of colored wire from subbase terminals to low-voltage connections on unit (shown in Fig. 11) as described in Steps1-4
below.
1. If unit is mounted on roof curb and accessory thru-the-
curb 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. 7).
3. Feed wires through the raceway built into the corner post
to the 24-v barrier located on the left side of the control
Table 2 — Electrical Data
box. See Fig. 12. The raceway provides the UL-required
(Underwriters’Laboratories) clearance between high- and
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.
FLA— Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
IFM— Indoor (Evaporator) Fan Motor
LRA— Locked Rotor Amps
MCA— Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC— National Electrical Code
OFM— Outdoor (Condenser) Fan Motor
RLA— Rated Load Amps
UL— Underwriters’ Laboratories
*Used to determine minimum disconnect size per NEC.
†Fuse or HACR circuit breaker.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the
overcurrent protective device for the unit shall be fuse or HACR
breaker. Canadian units may be fuse or circuit breaker.
2. Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater than 2%.
the percent voltage imbalance.
Use the following formula to determine
% Voltage Imbalance
= 100 x
max voltage deviation from average voltage
average voltage
OFM
(ea)
1
⁄41.45.8.5739.2/39.245/4541/41 194/194
1
⁄40.82.6.3018.0251999
1
⁄40.82.6.3014.2201581
1
⁄41.45.8.5744.2/44.250/5046/46 231/231
1
⁄40.82.6.3020.72522116
1
⁄40.82.6.3016.52017107
1
⁄41.4
1
⁄40.8
1
⁄40.8
1
⁄41.4
1
⁄40.8
1
⁄40.8
IFM
5.8
2.6
2.6
10.6
4.8
4.8
COMBUSTION
FAN MOTOR
.57
.30
.30
.57
.30
.30
POWER SUPPLY
DISCONNECT
SIZE*
48.9/48.960/6051/51 267/267
23.43024134
17.62018107
65.2/65.280/8068/68 383/383
29.63531192
23.63025154
EXAMPLE: Supply voltage is 460-3-60.
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
452 + 464 + 455
3
1371
=
3
= 457
NOTE: The 575-v 48TJ008-014 units are UL, Canada, only.
Determine maximum deviation from average voltage.
APOLLO CONTROL — The optionalApollo 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 VVTt 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. 13 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 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
the filter access panel. Remove outdoor-air opening panel.
Save panels and screws. See Fig. 14.
3. Separate hood and screen from basepan by removing the
screws and brackets securing them. Save all screws and
discard brackets.
4. Replace outdoor air opening panel with screws saved
from Step 2.
5. Place hood on front of outdoor-air opening panel. See
Fig. 15 for hood details. Secure top of hood with the
6 screws removed in Step 3. See Fig. 16.
6. Remove and save 8 screws (4 on each side) from sides
of the manual outdoor-air damper.
7. Align screw holes on hood with screw holes on side of
manual outdoor-air damper. See Fig. 15 and 16. Secure
hood with 8 screws from Step 6.
8. Adjust minimum position setting of the damper blade
by adjusting the manual outdoor-air adjustment screws
on the front of the damper blade. See Fig. 14. Slide blade
vertically until it is in the appropriate position determined by Fig. 17. Tighten screws.
OUTDOOR
AIR OPENING
PANEL
Fig. 14 — Damper Panel with Manual
Outdoor-Air Damper Installed
WIRING TO
THERMOST AT
APOLLO
CONTROL
CONTROL
WIRING
Fig. 13 — Apollo Control Factory-Installed
in Typical Unit
Fig. 15 — Outdoor-Air Hood Details
HOOD
NOT
SHOWN)
Fig. 16 — Damper with Hood Attached
11
Page 12
Fig. 17 — Position Setting
9. Remove and save screws currently on sides of hood.
Insert screens. Secure screens to hood using the screws.
See Fig. 16.
10. Replace filter access panel. Ensure filter access panel
slides along the tracks and is securely engaged.
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. 18. 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. 19. 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 blockoff plate over duct openings. See Fig. 20.
5. Slide economizer into unit and secure with screws. See
Fig. 21.
NOTE: Be sure to engage rear economizer flange under
tabs in vertical return-air opening.
6. To convert to horizontal discharge application:
a. Rotate the economizer 90 degrees until the econo-
mizer motor faces the condenser section (see
Fig. 22).
b. Rotatethebarometricreliefdamperhinge
90 degrees. Barometric relief damper should open vertically to operate properly.
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. 23.
7. Insert economizer plug into economizer harness. Remove tape from barometric relief damper. See Fig. 21.
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. 24. Adjust
minimum position setting by adjusting the screws on the
position setting bracket. See Fig. 25. Slide bracket until
the top screw is in the position determined by
Fig. 24. Tighten screws.
9. Remove tape from outdoor-air thermostat (OAT). Fasten OAT to inside of hood using screws and speed clips
provided. See Fig. 26. 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. 26. Set for 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. 26.
13. Connect OAT per Fig. 27.
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. 28 for Durablade economizer barometric relief damper characteristics.
12
OUTDOOR-AIR
OPENING PANEL
Fig. 18 — Access Panel Locations
FILTER ACCESS
PANEL
Page 13
ECONOMIZER
CONTROL BOARD
ECONOMIZER
PLUG
ECONOMIZER
MOTOR
TOP
SCREW
Fig. 21 — Durablade Economizer Installed in Unit
Fig. 19 — Outdoor-Air Hood Details
Fig. 20 — Vertical Discharge Block-Off Plate
(Sizes 120,150 only)
ECONOMIZER CONTROL BOARD
POSITION SETTING BRACKET
ECONOMIZER MOTOR
Fig. 22 — Horizontal Durablade Economizer
Installation (90 Degree Rotation)
13
BLOCK-OFF PLATE
Fig. 23 — Horizontal Discharge Block-Off Plate
Page 14
Example:
Given —
Negative Pressure .......................0.1in.wg
Outdoor Airflow ........................1100cfm
Determine —
Setting = 69
Fig. 24 — Durablade Economizer Damper
Minimum Position Setting
9
8
7
6
5
4
3
2
1
0
Fig. 25 — Durablade Economizer Minimum
Position Damper Setting
14
REV. B
CONTACTS SHOWN IN HIGH ENTHALPY
OR UNPOWERED STATE
B
198818A
C
TR
D
S
S
O
5
ENTHALPY
3
TR
24VAC
2
CONTROL
TR1
1
MINIMUM
POSITION
OPEN
1
3
T
P
2
T1
4
P1
CONTACT RATINGS: 1.5A RUN, 3.5A IN
RUSH AT 24VAC
%
H
U
M
I
D
I
T
Y
90
70
60
30
10
CW–SETPOINTS–CCW
D
50
DAMPER
C
OUTDOOR TEMP.
OPEN
55
B
A
60
°F
3 mA MIN. AT 11 VDC
65
70
DAMPER
CLOSED
75
80
85
97-3672
REV.
Fig. 26 — Outdoor-Air Thermostat/
Enthalpy Control Installation
Fig. 27 — Wiring Connections for
Outdoor-Air Thermostat
Page 15
Fig. 28 — Durablade Economizer Barometric Relief
Damper Characteristics
OPTIONAL PARABLADE ECONOMIZER — The optional PARABLADE 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. The PARABLADE economizer can
only be used for vertical discharge applications. 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 7.
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.
See Fig. 18. Save panels and screws. Remove optional
economizer so the outdoor-air damper hood package can
be removed from the filter section.
3. Assemble outdoor-air hood top and side plates as shown
in Fig. 19. 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 blockoff plate over duct openings. See Fig. 20.
5. Slide economizer into unit and secure with screws. See
Fig. 29.
NOTE: Be sure to engage rear economizer flange under
tabs in vertical return-air opening.
6. Insert economizer plug into economizer harness. Remove tape from barometric relief damper. See Fig. 29.
7. If ventilation air is not required, proceed to Step 8. If
ventilation air is required, perform the following:
a. Make sure the factory-installed jumper is in place across
terminals P and P1 on the economizer logic module.
T and T1 should be disconnected during adjustment.
b. The 2 potentiometers with slots for adjustment are
located on the face of the economizer logic module.
Turn the lower potentiometer fully clockwise. The
dampers should be fully closed. Turn the potentiometer gradually counterclockwise until the desired po-
sition is reached.
c. Connect T and T1 to the 24 v power supply.
d. After installation is complete, calculate the mini-
mum airflow across the economizer. To calculate the
minimum airflow, the following data is needed: total
cfm (cfm
perature of the return air (T1), and temperature of the
), temperature of the total cfm (T3), tem-
3
entering outside air (T2). Cfm1is the return air cfm,
which will be the minimum airflow.
Insert the data into the following equations:
(cfm1)+T2(cfm2)
T
1
cfm
3
=T
3
cfm2= (cfm3– cfm1)
Therefore:
(cfm1)+T2(cfm3– cfm1)
T
1
cfm
3
=T
3
Use this equation to determine cfm1, which is the mini-
mum airflow across the economizer.
cfm1=
(T
If cfm
from Step 1, re-adjust the minimum position setting
does not match the desired minimum airflow
1
3–T2
(T
1–T2
) cfm
)
3
screw.
8. Determine the enthalpy changeover set point from
Fig. 30. The enthalpy changeover set point should be
set to return the outdoor air damper to the minimum position when enthalpy rises above the set point. The settings are A, B, C, and D. Set the enthalpy changeover
per the setting in Fig. 30.
9. 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. See Fig. 31.
10. Fasten hood top and side plate assembly (Fig. 32) to
outdoor-air opening panel with screws provided.
11. Slide outdoor-air inlet screens into screen track on hood
side plate. While holding screens in place, fasten screenretainer to hood using screws provided. See Fig. 33.
ECONOMIZER CONTROL
MODULE/DAMPER ACTUATOR
WIRING
HARNESS
ENTHALPY
SENSOR
BAROMETRIC
RELIEF DAMPER
Fig. 29 — PARABLADEEconomizer Installed in Unit
15
Page 16
CONTROL
CURVE
RH — Relative Humidity
CONTROL POINT
F (C) (APPROX)
A73 [23]
B70 [21]
C67 [19]
D63 [17]
AT 50% RH
Fig. 30 — Enthalpy Settings for
PARABLADE Economizer
Fig. 31 — Panels Reinstalled on Unit
Fig. 33 — Filter Installed on Outdoor-Air Hood
Step 9 — Adjust Evaporator-Fan Speed — Ad-
just evaporator-fan speed to meet jobsite conditions.
Table 3 shows fan rpm at motor pulley settings, Table 4
shows motor efficiencies and Table 5 gives accessory static
pressure drops. Table 6 shows motor performance. Refer to
Tables 7-14 to determine fan speed settings. Fan motor pulleys are factory set for speed shown in Table 1.
To change fan speed:
1. Shut off unit power supply.
2. Loosen belt by loosening fan motor mounting plate nuts
(see Fig. 34 and 35).
3. Loosen movable pulley flange setscrew (see Fig. 36).
4. Screw movable flange toward fixed flange to increase speed
and away from fixed flange to decrease speed. Increasing
fan speed increases load on motor. Do not exceed maximum speed specified in Table 1.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew (see Table 1 for speed change for each
full turn of pulley flange).
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 mount-
ing plate.
To adjust belt tension (see Fig. 34 and 35):
1. Loosen fan motor mounting plate nuts.
2. Units 008,009 — Slide motor mounting plate away from
fan scroll for proper belt tension (
one finger) and tighten mounting nuts (see Fig. 34).
Units 012,014 — Slide motor mounting plate downward
to tighten belt tension. Secure motor mounting plate nuts.
See Fig. 35.
3. Adjust bolt and nut on mounting plate to secure motor in
NOTE: Convert watts to bhp using the following formula:
watts input x motor efficiency
bhp =
746
Table 5 — Economizer Static Pressure Drop (in. wg)
UNIT
48TJ
Durablade Economizer.02.02.03.04.05.06.07.08.09
PARABLADE Economizer.21.25.35.49.61————
220025003000350040004500500055006000
CFM
Table 6 — Motor Data
UNIT
48TJ
008Std2.402120
009Std2.402120
012
014
LEGEND
Bhp — Brake Horsepower
*Extensive motor and electrical testing on these units ensures that the full horsepower and watts 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.
EVAPORATOR-
FAN MOTOR
Std2.402120
Alt2.902615
Std4.203775
Alt5.254400
MAXIMUM
CONTINUOUS
BHP*
MAXIMUM
OPERATING
WATTS*
UNIT
VOLTAGE
208/2306.1
4602.7
5752.7
208/2306.1
4602.7
5752.7
208/2306.1
4602.7
5752.7
208/2307.9
4603.6
5753.6
208/23011.1
4605.0
5755.0
208/23015.0
4607.4
5757.4
MAXIMUM
AMP DRAW
18
Page 19
Table 7 — Fan Performance, 48TJ008 — Vertical Discharge Units
1. Boldface indicates field-supplied drive required. (See Note 4.)
2.indicates alternate drive required.
3.indicates field-supplied motor and drive required.
4. Standard drive range is 590 to 840 rpm. Alternate drive range is
685 to 935 rpm. All other rpms require a field-supplied drive.
0.20.40.60.81.01.21.41.6
RpmBhpRpmBhpRpmBhpRpmBhpRpmBhpRpmBhpRpmBhpRpmBhp
LEGEND
EXTERNAL STATIC PRESSURE (in. wg)
5. Values include losses for filters, unit casing, and wet coils.
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 your fan motors up to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected.
7. Use of a field-supplied motor may affect wire sizing. Contact your
Carrier representative to verify.
8. Interpolation is permissible. Do not extrapolate.
Table 8 — Fan Performance, 48TJ009 — Vertical Discharge Units
1. Boldface indicates field-supplied drive required. (See Note 3.)
2.indicates field-supplied motor and drive required.
3. Standard drive range is 685 to 935 rpm. All other rpms require a
field-supplied drive.
4. Values include losses for filters, unit casing, and wet coils.
0.20.40.60.81.01.21.41.6
RpmBhpRpmBhpRpmBhpRpmBhpRpmBhpRpmBhpRpmBhpRpmBhp
LEGEND
EXTERNAL STATIC PRESSURE (in. wg)
5. 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 your fan motors up to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected.
6. Use of a field-supplied motor may affect wire sizing. Contact your
Carrier representative to verify.
7. Interpolation is permissible. Do not extrapolate.
19
Page 20
Table 9 — Fan Performance, 48TJ012 — Vertical Discharge Units
5. Values include losses for filters, unit casing, and wet coils.
6. Maximum continuous bhp is 2.4 for the standard motor and 2.9 for
thealternatemotor.Extensive motor and electrical testing on these
units ensures that the full range of the motor can be utilized with
confidence. Using your fan motors up to the ratings shown will not
result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
7. Use of a field-supplied motor may affect wire sizing. Contact your
Carrier representative to verify.
8. Interpolation is permissible. Do not extrapolate.
Table 10 — Fan Performance, 48TJ014 — Vertical Discharge Units
5. Values include losses for filters, unit casing, and wet coils.
6. Maximum continuous bhp is 4.2 for the standard motor and 5.25
for the alternate motor. Extensive motor and electrical testing on
these units ensures that the full range of the motor can be utilized
with confidence. Using your fan motors up to the ratings shown
will not result in nuisance tripping or premature motor failure. Unit
warranty will not be affected.
7. Use of a field-supplied motor may affect wire sizing. Contact your
Carrier representative to verify.
8. Interpolation is permissible. Do not extrapolate.
20
Page 21
Table 11 — Fan Performance, 48TJ008 — Horizontal Discharge Units
5. Values include losses for filters, unit casing, and wet coils.
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 your fan motors up to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected.
7. Use of a field-supplied motor may affect wire sizing. Contact your
Carrier representative to verify.
8. Interpolation is permissible. Do not extrapolate.
Table 12 — Fan Performance, 48TJ009 — Horizontal Discharge Units
5. 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 your fan motors up to the ratings shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected.
6. Use of a field-supplied motor may affect wire sizing. Contact your
Carrier representative to verify.
7. Interpolation is permissible. Do not extrapolate.
21
Page 22
Table 13 — Fan Performance, 48TJ012 — Horizontal Discharge Units
5. Values include losses for filters, unit casing, and wet coils.
6. Maximum continuous bhp is 2.4 for the standard motor and 2.9 for
thealternatemotor.Extensive motor and electrical testing on these
units ensures that the full range of the motor can be utilized with
confidence. Using your fan motors up to the ratings shown will not
result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
7. Use of a field-supplied motor may affect wire sizing. Contact your
Carrier representative to verify.
8. Interpolation is permissible. Do not extrapolate.
Table 14 — Fan Performance, 48TJ014 — Horizontal Discharge Units
5. Values include losses for filters, unit casing, and wet coils.
6. Maximum continuous bhp is 4.2 for the standard motor and 5.25
for the alternate motor. Extensive motor and electrical testing on
these units ensures that the full range of the motor can be utilized
with confidence. Using your fan motors up to the ratings shown
will not result in nuisance tripping or premature motor failure. Unit
warranty will not be affected.
7. Use of a field-supplied motor may affect wire sizing. Contact your
Carrier representative to verify.
8. Interpolation is permissible. Do not extrapolate.
22
Page 23
START-UP
Unit Preparation —
stalled in accordance with these installation instructions and
applicable codes. Make sure that Start-Up Checklist has been
completed and filled out.
Make sure that unit has been in-
Return-Air Filters — Make sure correct filters are in-
stalled in filter tracks (see Table 1). Do not operate unit without return-air filters.
nally spring mounted. Do not loosen or remove compressor
holddown bolts. On 48TJ014 units, remove the tiedown bands
that hold the compressors together.
Internal Wiring — Check all electrical connections in
unit control boxes. Tighten as required.
Refrigerant Service Ports — Each refrigerant sys-
tem 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.
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.
3. Reverse any two of the unit power leads.
4. Reapply power to the 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.
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 starts on closure of contactor.
Check unit charge. Refer to Service, Refrigerant Charge
section, page 26.
Reset thermostat at a position above room temperature.
Compressor will shut off. Evaporator fan will shut off after
30-second delay.
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.
MainBurners — 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 15 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.
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.
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 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 1.
NOTE: The default value for the evaporator-fan motor
ON and OFF delay is 45 seconds. The Integrated Gas Unit
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.Ifthe limit switch
trips during this period, the evaporator-fan OFF delay will
increase by 15 seconds. 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.
*As the height above sea level increases, there is less oxygen per
cubic foot of air. Therefore, heat input rate should be reduced at
higher altitudes.
†Orifice available through your local distributor.
NOMINAL INPUT
Natural
Gas
Orifice
Size†
Liquid
Propane
Orifice
Size†
250,000 BTUH
NOMINAL INPUT
Natural
Gas
Orifice
Size†
Liquid
Propane
Orifice
Size†
Safety Relief — A soft-solder joint at the suction line
Schrader port provides pressure relief under abnormal temperature and pressure conditions.
Ventilation (Continuous Fan) — Set fan and sys-
tem 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 evaporatorfan motor, compressor no. 1, and condenser fan start. The
condenser-fan 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 motor (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 57 F, the damper continues to open until it reaches
the fully open position or until the supply-air temperature
drops below 52 F.
When the supply-air temperature falls to between 57 F
and 52 F, the damper will remain at an intermediate open
position. If the supply-air temperature falls below 52 F, the
damper will modulate closed until it reaches the minimum
position or until the supply-air temperature is above 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.
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 PARABLADE ECONOMIZER
— When the outdoor air is above the enthalpy control setting, and the room thermostat calls for cooling, the compressor contactor no. 1 is energized to start compressor no. 1 and
the outdoor (condenser) fan motor. The indoor (evaporator)
fan motor is energized and the economizer damper moves to
the minimum position. Upon further call for cooling, compressor contactor no. 2 is energized, starting compressor
no. 2. After the room thermostat is satisfied the damper will
spring return to the fully closed position.
When the outdoor air is below the enthalpy control setting
and the thermostat calls for cooling, the economizer outdoor
air damper is opened proportionally to maintain between 50
and 56 F at the mixed air sensor. If outside air alone cannot
satisfy the cooling requirements, economizer cooling is integrated with mechanical cooling and the second compressor is locked out. When the room thermostat is satisfied, the
damper will spring return to the fully closed position.
HEATING, UNITSWITH 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 is then energized and the burner
ignition sequence begins. The indoor (evaporator) fan motor
(IFM) is energized 45 seconds after a flame is ignited and
the damper moves to the minimum position. 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. The economizer damper then moves to
the fully closed position. When using continuous fan, the
damper will remain in the minimum position.
24
Page 25
SERVICE
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 and 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. Slide filters out of 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.
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 — Washcoil 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. 37. To hold
top panel open, place coil corner post between top panel
and center post. See Fig. 38.
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. 39.
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 stiffbrush 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.
Fig. 37 — Cleaning Condenser Coil
Fig. 38 — Propping Up Top Panel
Fig. 39 — Separating Coil Sections
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.
25
Page 26
Condenser-Fan Adjustment (Fig. 40)
1. Shut off unit power supply.
2. Remove condenser-fanassembly (grille, motor, motor cover,
and fan) and loosen fan hub setscrews.
3. Adjust fan height as shown in Fig. 40.
4. Tighten setscrews and replace condenser-fan assembly.
48TJ UNIT VOLTAGEFAN HEIGHT ‘‘A’’ (in.)
208/230 V2.75
460 V and 575 V3.50
Fig. 40 — Condenser-Fan Adjustment
ManualOutdoor-Air Damper— If outdoor-air damper
blade is required, see Manual Outdoor-Air Damper section
on page 11.
EconomizerAdjustment— Refer to Optional Econo-
mizer sections on pages 12 and 15.
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 affectthereading. Indoorair cfm must be within the normal operating range of the
unit.
TO USE COOLING CHARGING CHART— 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 recover some
of the charge. Recheck the suction pressure as charge is adjusted. Example (Fig. 44, Circuit 2):
Suction Temperature should be ..................56F
(Suction temperature may vary±5F.)
If Chargemastert charging device is used, temperature and
pressure readings must be accomplished using the charging
charts.
CondenserCoil Grille — Condenser coil grille is shipped
factory-installed. No adjustments are required.
Refrigerant Charge — Amount of refrigerant charge
is listed on unit nameplate (also refer to Table 1). 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 dur-
ing charging procedure.
NO CHARGE — Use standard evacuating techniques. After
evacuating system, weigh in the specified amount of refrigerant (refer to Table 1).
LOW CHARGE COOLING — Using Cooling Charging
Charts, Fig. 41-44, 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
Fig. 41 — Cooling Charging Chart; 48TJ008
26
Page 27
Fig. 42 — Cooling Charging Chart; 48TJ009
Fig. 43 — Cooling Charging Chart; 48TJ012
27
Page 28
Fig. 44 — Cooling Charging Chart; 48TJ014
Flue Gas Passageways — To inspect the flue col-
lector 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.
Combustion-Air Blower — Clean periodically to as-
sure proper airflow and heating efficiency. Inspect blower
wheel every fall and periodically during heating season. For
the first heating season, inspect blower wheel bimonthly to
determine proper cleaning frequency.
To inspect blower wheel, shine a flashlight into drafthood
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 hous-
ing to vestibule plate (Fig. 45).
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.
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. 12). Module contains a self-diagnostic LED. A single LED on the IGC provides a visual display of operational or sequential 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 23. The LED error code can be observed through the viewport. See Fig. 12. During servicing
refer to the label on the control box cover or Table 16 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.
Table 16 — LED Error Code Description*
LED INDICATIONERROR CODE DESCRIPTION
ONNormal Operation
OFFHardware Failure
1 Flash†Evaporator Fan On/Off Delay Modified
2 FlashesLimit Switch Fault
3 FlashesFlame Sense Fault
4 Flashes4 Consecutive Limit Switch Faults
5 FlashesIgnition Lockout Fault
6 FlashesInduced-Draft Motor Fault
7 FlashesRollout Switch Fault
8 FlashesInternal Control Fault
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 op-
erate when this code is displayed.
IMPORTANT: Refer to Troubleshooting Tables17-21 for additional
information.
Main Burners — At the beginning of each heating sea-
son, inspect for deterioration or blockage due to corrosion or
other causes. Observe the main burner flames and adjust if
necessary.
When working on gas train, do not hit or plug orifice
spuds.
28
Page 29
REMOVAL AND REPLACEMENT OF GAS TRAIN
(Fig. 45 and 46)
1. Shut off manual gas valve.
2. Shut off power to unit.
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. 46).
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, above.
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. 47.
5. Reinstall burners on rack.
6. Reinstall burner rack as described in Removal and Replacement of Gas Train section, this page.
INDUCED-DRAFT
MOTOR
MANIFOLD
PRESSURE TAP
GAS VALVE
Fig. 45 — Burner Section Details
ROLLOUT
SWITCH
BURNER
SECTION
FLUE
FLUE
EXHAUST
EXHAUST
VESTIBULE
PLATE
Replacement Parts — A complete list of replace-
ment parts may be obtained from any Carrier distributor upon
request.
IGC — Integrated Gas Unit Controller
LED — Light-Emitting Diode
Loss of power to control module (IGC).Check 5-amp fuse on IGC, power to unit, 24-v circuit
High temperature limit switch is open.Check the operation of the indoor (evaporator) fan mo-
The IGC sensed flame that should not be present.Reset unit. If problem persists, replace control board.
Inadequate airflow to unit.Check operation of indoor (evaporator) fan motor and
Unit unsuccessfully attempted ignition for 15 minutes.Check ignitor and flame sensor electrode spacing, gaps,
IGC does not sense that induced-draft motor is
operating.
Rollout switch has opened.Rollout switch will automatically reset, but IGC will con-
Microprocessor has sensed an error in the software or
hardware.
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.
tor. Ensure that the supply-air temperature rise is in accordance with the range on the unit nameplate.
that supply-air temperature rise agrees with range on
unit nameplate information.
etc. Ensure that flame sense and ignition wires are properly terminated. Verify that unit is obtaining proper
amount of gas.
Check for proper voltage. If motor is operating, check
the speed sensor plug/IGC Terminal J2 connection.
Proper connection: PIN 1 — White, PIN 2 — Red, PIN 3
— Black.
tinue to lock out unit. Check gas valve operation. Ensure
that induced-draft blower wheel is properly secured to
motor shaft. Reset unit at unit disconnect.
If error code is not cleared by resetting unit power, replace the IGC.
IMPORTANT: Refer to Table 21 — 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
andmaybedamagedifthe necessary precautions are not taken.
31
Page 32
Table 18 — Durablade Economizer Troubleshooting
PROBLEMCAUSEREMEDY
Damper does not
open.
Economizer operation
limited to minimum
position.
Damper does not
close.
Economizer damper
does not close on
power loss.
LEGEND
C1— Common Power
EC— Enthalpy Control
IFC — Indoor (Evaporator) Fan Contactor
IFO — Indoor (Evaporator) Fan On
OAT — Outdoor-Air Thermostat
PL— Plug
SAT — Supply-Air Thermostat
SW — Economizer Position Switch
Indoor (evaporator) fan is off.1. Check to ensure that 24 vac is present at terminal C1 on the IFC or
No power to economizer motor.1. Check that SW3 is properly making contact with the damper
Economizer motor failure.If the indoor (evaporator) fan and economizer motor are energized,
OAT or EC set too high.1. Set at correct temperature (3 F below indoor space temperature).
Verify economizer control board is correctly wired
and works properly.
Check SAT.1. After verifying that the OAT and EC settings and the economizer
Incorrect wiring of economizer.1. Verify that SW2 and SW4 are wired and working properly (see unit
Verify economizer control board is functioning
properly.
Check SAT.1. After verifying that the wiring is correct and the economizer control
Economizer motor failure.If economizer control board and SAT are functioning properly, verify
Verify that close-on-power-loss and economizer
control board are functioning properly.
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.
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.
verify that there is a minimum of 18 vdc at the positive motor terminal.
If the motor is not operating, replace the motor.
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.
1. Perform the following tests when OAT or EC is closed, Y1 is called
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.
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 57 F, 24 vac should be
found at terminal T2 on the SAT (pink wire). If 24 vac is not present,
replace SAT.
label diagram).
2. Check diode D2. If diode is not functioning properly, replace D2.
1. After verifying that the wiring is correct, modulate the damper to the
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.
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 52 F, 24 vac should be found
at terminal T1 on the SAT (violet wire). If 24 vac not found, replace
SAT.
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.
1. Check voltage potential across batteries. If lower than 14 vdc, replace close-on-power-loss power supply (9-v alkaline batteries). It 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.
32
Page 33
Table 19 — PARABLADE Economizer Service Troubleshooting
PROBLEMCAUSEREMEDY
Damper does not
open.
Economizer operation limited to minimum position.
Damper does not
close.
Damper does not
open or
close according to
enthalpy
readings.
LEGEND
LED — Light-Emitting Diode
Evaporator fan not on.Check wiring between G on connection board and indoor (evaporator)
No power to economizer motor.1. Disconnect power at TR and TR1. Disconnect jumper across P
Economizer motor failure.If the indoor (evaporator) fan and economizer motor are energized,
Economizer control module
failure.
No power to economizer.1. Disconnect power at TR and TR1. Disconnect jumper across P
Spring return failure.If power to unit is off and damper does not close, check for a bound
Economizer motor failure.If the economizer control module is functioning properly, verify that
Sensor incorrectly wired or bad.To verify sensor operation, reconnect the + lead of the outdoor en-
fan contactor.
and P1.
2. Connect jumper across TR and 1.
3. Connect jumper across T1 and T.
4. If connected, remove enthalpy sensor from terminals S
Factory-installed 620 ohm resistor should be connected to terminals SRand +.
5. Apply power (24 vac) to terminals TR and TR1. The LED should
be off and the damper should be in the closed position.
6. Disconnect the factory-installed 620 ohm resistor from terminals
S
and +. The LED should light up and the motor should drive to-
R
wards open. If this does not happen, replace the economizer control module.
verify that there is a minimum of 24 vac at terminals TR and TR1. If
the motor is not operating, replace the motor.
1. To simulate high or low enthalpy, reconnect the factory-installed
620 ohm resistor across terminals S
2. Connect 1.2 Kohm checkout resistor across terminals Soand +.
Turn the enthalpy set point to ‘‘A.’’ The LED should turn on, indicating low enthalpy. The motor should drive towards open. If LED
does not light, replace module. If motor does not drive open, check
motor operation.
3. Turn the enthalpy set point to ‘‘D.’’ The LED should turn off, indicating high enthalpy. The motor should drive towards closed. If
these actions do not occur, replace module.
4. Disconnect 1.2 Kohm checkout resistor before resuming operation.
and P1.
2. Connect jumper across TR and 1.
3. Connect jumper across T1 and T.
4. If connected, remove enthalpy sensor from terminals S
Factory-installed 620 ohm resistor should be connected to terminals SRand +.
5. Apply power (24 vac) to terminals TR and TR1. The LED should
be off and the damper should be in the closed position.
6. Disconnect the factory-installed 620 ohm resistor from terminals
S
and +. The LED should light up and the motor should drive to-
R
wards open. If this does not happen, replace the economizer control module.
linkage. If linkage is not bound, then internal spring may be broken.
Replace actuator.
there is a minimum of 24 vac at terminals TR and TR1. If the motor is
not operating, replace the motor.
thalpy sensor to the + terminal of the economizer control module.
Connect a DC milliammeter between terminals S
control module and terminal S of the enthalpy sensor. The milliammeter should indicate between 3 and 25 mA if the sensor is operating
properly. If the milliammeter indicates 0, the sensor may be wired
backwards. If any other readings are shown, replace the sensor.
and +.
R
and +.
o
and +.
o
of the economizer
o
33
Page 34
Table 20 — Cooling Service Troubleshooting
PROBLEMCAUSEREMEDY
Compressor and
condenser fan
will not start.
Compressor will not start
but condenser fan runs.
Compressor cycles
(other than normally
satisfying thermostat).
Compressor makes
excessive noise
(48TJ014 scroll only)
Compressor operates
continuously.
Excessive head pressure. Dirty air filter.Replace filter.
Head pressure too low.Low refrigerant charge.Check for leaks, repair, and recharge.
Excessive suction
pressure.
Suction pressure too low. Dirty air filter.Replace filter.
Compressor no. 2
will not run.
Power failure.Call power company.
Fuse blown or circuit breaker tripped.Replace fuse or reset circuit breaker.
Defective thermostat, contactor, transformer, or control
relay.
Insufficient line voltage.Determine cause and correct.
Incorrect or faulty wiring.Check wiring diagram and rewire correctly.
Thermostat setting too high.Lower thermostat setting below room temperature.
Faulty wiring or loose connections in compressor circuit. Check wiring and repair or replace.
Compressor motor burned out, seized, or internal
overload open.
Defective run/start capacitor, overload, or start relay.Determine cause and replace.
One leg of 3-phase power dead.Replace fuse or reset circuit breaker.
Refrigerant overcharge or undercharge.Recover refrigerant, evacuate system, and recharge
Defective compressor.Replace and determine cause.
Insufficient line voltage.Determine cause and correct.
Blocked condenser.Determine cause and correct.
Defective run/start capacitor, overload, or start relay.Determine cause and replace.
Defective thermostat.Replace thermostat.
Faulty condenser-fan motor or capacitor.Replace.
Restriction in refrigerant system.Locate restriction and remove.
Compressor rotating in wrong direction.Reverse the 3-phase power leads as described
Dirty air filter.Replace filter.
Unit undersized for load.Decrease load or increase unit size.
Thermostat set too low.Reset thermostat.
Low refrigerant charge.Locate leak, repair, and recharge.
Leaking valves in compressor.Replace compressor.
Air in system.Recover refrigerant, evacuate system, and recharge.
Condenser coil dirty or restricted.Clean coil or remove restriction.
Dirty condenser coil.Clean coil.
Refrigerant overcharged.Remove excess refrigerant.
Air in system.Recover refrigerant, evacuate system, and recharge.
Condenser air restricted or air short-cycling.Determine cause and correct.
Compressor valves leaking.Replace compressor.
Restriction in liquid tube.Remove restriction.
High heat load.Check for source and eliminate.
Compressor valves leaking.Replace compressor.
Refrigerant overcharged.Recover excess refrigerant.
Low refrigerant charge.Check for leaks, repair, and recharge.
Metering device or low side restricted.Remove source of restriction.
Insufficient evaporator airflow.Increase air quantity. Check filter and replace if
Temperature too low in conditioned area.Reset thermostat.
Field-installed filter drier restricted.Replace.
Unit in economizer mode.Proper operation; no remedy necessary.
Replace component.
Determine cause. Replace compressor.
Determine cause.
to nameplate.
on page 23.
necessary.
34
Page 35
Table 21 — Heating Service Troubleshooting
PROBLEMCAUSEREMEDY
Burners will not
ignite.
Inadequate heating.Dirty air filter.Clean or replace filter as necessary.
Poor flame
characteristics.
Burners will not
turn off.
Misaligned spark electrodes.Check flame ignition and sensor electrode positioning.
No gas at main burners.Check gas line for air purge as necessary. After purging
Water in gas line.Drain water and install drip leg to trap water.
No power to furnace.Check power supply, fuses, wiring, and circuit breaker.
No 24 v power supply to control circuit.Check transformer. Transformers with internal overcur-
Miswired or loose connectionsCheck all wiring and wirenut connections.
Burned-out heat anticipator in thermostat.Replace thermostat.
Broken thermostat wires.Run continuity check. Replace wires, if necessary.
Gas input to unit too low.Check gas pressure at manifold. Clock gas meter for
Unit undersized for application.Replace with proper unit or add additional unit.
Restricted airflow.Clean filter, replace filter, or remove any restrictions.
Blower speed too low.Use high speed tap, increase fan speed, or install op-
Limit switch cycles main burners.Check rotation of blower, thermostat heat anticipator setToo much outdoor air.Adjust minimum position.
Incomplete combustion (lack of combustion air)
results in:
Aldehyde odors, CO, sooting flame, or floating flame.
Unit is locked into Heating mode for a one minute
minimum.
Adjust as needed.
gas line of air, allow gas to dissipate for at least 5 min-
utes before attempting to relight unit.
Check gas valve.
rent protection require a cool down period before
resetting.
input. If too low, increase manifold pressure, or replace
with correct orifices.
tional blower, as suitable for individual units.
tings, and temperature rise of unit. Adjust as needed.
Check economizer operation.
Check all screws around flue outlets and burner com-
partment. Tighten as necessary.
Cracked heat exchanger.
Overfired unit — reduce input, change orifices, or adjust
gas line or manifold pressure.
Check vent for restriction. Clean as necessary.
Check orifice to burner alignment.
Wait until mandatory one minute time period has
elapsed or power to unit.
LEGEND AND NOTES FOR FIG. 48
IMPORTANT: Refer to unit wiring label for actual unit
wiring information.
LS— Limit Switch
MGV — Main Gas Valve
MTR— Motor
OAT— Outdoor Air Thermostat
OFM— Outdoor-Fan Motor
PL— Plug Assembly
QT— Quadruple Terminal
R—Relay
RS— Rollout Switch
SAT— Supply Air Thermostat
SEN— Sensor
TC— Thermostat-Cooling
TH— Thermostat-Heating
TRAN — Transformer
Controller
Switch
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
5. Use copper conductors only.
6. TRAN is wired for 230 v unit. If unit is to be run with 208 v power
supply,disconnect BLK wire from 230 v tap (RED) and connect to
200 v tap (BLU). Insulate end of 230 v tap.
7. When economizer assembly is installed move GRA wire from connection board (Y1) to GRA wire from PL6,5; move ORN wire from
connection board (Y2) to ORN wire from PL6,9, on economizer
assembly.
35
Page 36
Fig. 48 — Typical Wiring Schematic and Component Arrangement
36
Page 37
Page 38
Copyright 1996 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 1a 6a
PC 111Catalog No. 564-934Printed in U.S.A.Form 48TJ-13SIPg 389-96Replaces: 48TJ-10SI
Page 39
Page 40
I. PRELIMINARY INFORMATION
START-UP CHECKLIST
(Remove and Store in Job File)
MODEL NO.:
DATE:
SERIAL NO.:
TECHNICIAN:
II. PRE-START-UP (insert checkmark in box as each item is completed)
M VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT
M REMOVE SHIPPING TIE DOWN BANDS ON COMPRESSOR (SIZE 014 ONLY) PER INSTALLATION
INSTRUCTIONS
M VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTALLATION INSTRUCTIONS
M CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS
M CHECK GAS PIPING FOR LEAKS
M CHECK THAT INDOOR-AIR FILTERS ARE CLEAN AND IN PLACE
M VERIFY THAT UNIT INSTALLATION IS LEVEL
M CHECK FAN WHEELS AND PROPELLERS FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW