38YCW
10 SEER Split-System
Heat Pump
Installation and Start-Up Instructions
NOTE: Read the entire instruction manual before starting the
installation.
This symbol → indicates a change since the last issue.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory-authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have fire extinguisher available. Read these instructions thor-
oughly and follow all warnings or cautions included in literature
and attached to the unit. Consult local building codes and National
Electrical Code (NEC) for special requirements.
A98525
Fig. 1—Model 38YCW
Recognize safety information. This is the safety-alert symbol
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
.
4. Leave some slack between structure and unit to absorb
vibration.
5. When passing refrigerant tubes through the wall, seal opening
with RTV or other pliable silicon-based caulk. (See Fig. 2.)
Understand the signal words DANGER, WARNING, and CAU-
TION. These words are used with the safety-alert symbol. DAN-
GER identifies the most serious hazards which will result in severe
personal injury or death. WARNING signifies hazards which
could result in personal injury or death. CAUTION is used to
identify unsafe practices which would result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
6. Avoid direct refrigerant tubing contact with water pipes, duct
work, floor joists, wall studs, floors, and walls.
7. Do not suspend refrigerant tubing from joists and studs with a
rigid wire or strap that comes in direct contact with tubing.
(See Fig. 2.)
8. Ensure that refrigerant tubing insulation is pliable and com-
pletely surrounds vapor tube.
9. When necessary, use hanger straps which are 1 in. wide and
conform to shape of tubing insulation. (See Fig. 2.)
Before installing, modifying, or servicing system, main elec-
trical disconnect switch must be in the OFF position. There
may be more than 1 disconnect switch. Lock out and tag
switch(es) with a suitable warning label. Electrical shock can
cause personal injury or death.
10. Isolate hanger straps from insulation by using metal sleeves
bent to conform to shape of insulation.
When outdoor unit is connected to factory-approved indoor unit,
outdoor unit contains system-refrigerant charge for operation with
indoor unit of the same size when connected by 15 ft of
field-supplied or factory-accessory tubing. For proper unit opera-
tion, check refrigerant charge using charging information located
on control-box cover and/or in the Check Charge section of this
Instruction.
INTRODUCTION AND RECOMMENDATIONS
NOTE: In some cases noise has been traced to improper instal-
lation of equipment.
1. Locate unit away from windows, patios, decks, and so forth
where unit operation sounds may disturb customer.
IMPORTANT: Maximum liquid-line size is 5/8-in. O.D. for all
residential applications including long line applications.
2. Ensure that vapor- and liquid-tube diameters are appropriate to
capacity of unit.
IMPORTANT: Always install a liquid-line filter drier. Refer to
Product Data Digest for appropriate part number. Obtain filter
drier from your distributor or branch.
3. Run refrigerant tubes as directly as possible by avoiding
unnecessary turns and bends.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book
Tab 5a 5a
1
4
PC 101
Catalog No. 533-80020
Printed in U.S.A.
Form 38YCW-3SI
Pg 1
2-02
Replaces: 38YCC-4SI
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Table 1—Refrigerant Connections and Recommended Liquid- and Vapor-Tube Diameters (In.)
LIQUID
Connection Diameter
VAPOR
Connection Diameter
VAPOR (LONG LINE)
Connection Diameter Tube Diameter
UNIT
SIZE
Tube Diameter
Tube Diameter
018, 024
030, 036
042, 048
060
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/4
3/4
7/8
7/8
3/4
3/4
3/4
3/4
7/8
7/8
3/4
7/8
7/8
1-1/8
1-1/8
1-1/8
NOTES:
1. Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult Long Line section of the Application Guideline.
2. Do not apply capillary-tube indoor coils to these units.
Step 8—Make Piping Connections
non-silver-bearing brazing material. Consult local code re-
quirements.
Refrigerant tubing and indoor coil are now ready for leak testing.
This check should include all field and factory joints.
Relieve pressure and recover all refrigerant before system
repair or final unit disposal to avoid personal injury or death.
Use all service ports and open all flow-control devices,
including solenoid valves.
PISTON BODY
If ANY refrigerant tubing is buried, provide a 6 in. vertical
rise at service valve. Refrigerant tubing lengths up to 36 in.
may be buried without further special consideration. For
lengths above 36 in., consult your local distributor.
PISTON
PISTON
RETAINER
To prevent damage to unit or service valves observe the
following:
•Use a brazing shield.
STRAINER
•Wrap service valves with wet cloth or use a heat-sink
material.
Outdoor units may be connected to indoor section using accessory-
tubing package or field-supplied refrigerant-grade tubing of cor-
rect size and condition. For tubing requirements beyond 50 ft
length or 20 ft vertical differential, substantial capacity and
performance losses can occur. Following the recommendations in
the Residential Split-System Long-Line Application Guideline
will reduce these losses. Refer to Table 1 for field-tubing diam-
eters.
SWEAT/FLARE ADAPTER
A97512
Fig. 4—Liquid-Service Valve with Sweat-Adapter
Tube
FINAL TUBING CHECK
REFRIGERANT TUBING
IMPORTANT: Check to be certain factory tubing on both indoor
and outdoor unit has not shifted during shipment. Ensure tubes are
not rubbing against each other or any sheet metal. Pay close
attention to feeder tubes, making sure wire ties on feeder tubes are
secure and tight.
Connect tubing to fittings on outdoor unit vapor- and liquid-
service valves. (See Table 1.) Use refrigerant-grade tubing. Refer
to appropriate section below for type of service valves installed on
unit.
Step 9—Make Electrical Connections
SWEAT CONNECTION
To avoid personal injury or death, do not supply power to unit
with compressor terminal-box cover removed.
To avoid valve damage while brazing, service valves must be
wrapped in a heat-sinking material such as a wet cloth.
Be sure field wiring complies with local and national fire, safety,
and electrical codes, and voltage to system is within limits shown
on unit-rating plate. Contact local power company for correction of
improper voltage. See unit-rating plate for recommended circuit-
protection device.
1. Remove plastic retainer holding outdoor piston in liquid-
service valve.
2. Locate adapter tube shipped with unit.
3. Install strainer in adapter tube and connect tube to service
valve. (See Fig. 4.)
NOTE: Operation of unit on improper line voltage constitutes
abuse and could affect unit reliability. See unit-rating plate. Do not
install unit in system where voltage or phase imbalance (3 phase)
may fluctuate above or below permissible limits.
4. Connect refrigerant tubing to fittings on outdoor-unit vapor-
and liquid-service valves.
5. Service valves are closed from factory and ready for brazing.
After wrapping service valve with a wet cloth, tubing set can
be brazed to service valve using either silver-bearing or
NOTE: Use copper wire only between disconnect switch and
unit.
3
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NOTE: Install branch-circuit disconnect of adequate size per
NEC to handle unit-starting current. Locate disconnect within sight
from and readily accessible from unit, per Section 440-14 of NEC.
only, set thermostat to OFF and close electrical disconnect to
outdoor unit. A crankcase heater is required if refrigerant tubing is
longer than 50 ft.
ROUTE GROUND AND POWER WIRES
Step 11—Install Electrical Accessories
Remove access panel and control box to gain access to unit wiring.
Extend wires from disconnect through power-wiring hole provided
and into unit-control box.
Refer to the individual instructions packaged with kits or acces-
sories when installing.
Step 12—Start-Up
The unit cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault
should occur. The ground may consist of electrical wire or
metal conduit when installed in accordance with existing
electrical codes. Failure to follow this warning can result in an
electric shock, fire, or death.
To prevent compressor damage or personal injury, observe
the following:
•Do not overcharge system with refrigerant.
•Do not operate unit in a vacuum or at negative pressure.
•Do not disable low-pressure switch.
In scroll compressor applications:
•Dome temperatures may be hot.
CONNECT GROUND AND POWER WIRES
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 5.
To prevent personal injury wear safety glasses, protective
clothing, and gloves when handling refrigerant and observe
the following:
•Back-seating service valves are not equipped with Schrader
valves. Fully back seat (counterclockwise) valve stem before
removing gage-port cap.
DISCONNECT
PER N.E.C. AND/OR
LOCAL CODES
CONTACTOR
•Front-seating service valves are equipped with Schrader
valves.
FIELD POWER
WIRING
BLUE
3 PHASE ONLY
FIELD GROUND
WIRING
Do not vent refrigerant to atmosphere. Recover during system
repair or final unit disposal.
GROUND
LUG
If refrigerant tubes or indoor coil are exposed to atmosphere, they
must be evacuated to 500 microns to eliminate contamination and
moisture in the system.
A94025
Fig. 5—Line Power Connections
CONNECT CONTROL WIRING
Follow these steps to properly start up the system:
1. Fully back seat (open) liquid- and vapor-tube service valves.
Route 24v control wires through control-wiring grommet and
connect leads to control wiring. Refer also to Installation Instruc-
tions packaged with thermostat.
2. Unit is shipped with valve stem(s) front seated (closed) and
caps installed. Replace stem caps after system is opened to
refrigerant flow. Replace caps finger-tight and tighten with
wrench an additional 1/12 turn.
Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If
thermostat is located more than 100 ft from unit, as measured
along the control-voltage wires, use No. 16 AWG color-coded
wire to avoid excessive voltage drop.
3. Close electrical disconnects to energize system.
4. Set room thermostat to desired temperature. Be sure set point
is below indoor ambient temperature.
All wiring must be NEC Class 1 and must be separated from
incoming power leads.
5. Set room thermostat to HEAT or COOL and fan control to ON
or AUTO, as desired. Operate unit for a minimum of 15
minutes. Check system refrigerant charge.
Use furnace transformer, fan-coil transformer, or accessory trans-
former for control power, 24v/40va minimum.
NOTE: Use of available 24v accessories may exceed the mini-
mum 40va power requirement. Determine total transformer load-
ing and increase the transformer capacity or split the load with an
accessory transformer as required.
•3-phase scroll compressors are rotation sensitive.
•A flashing LED on phase monitor indicates reverse rotation.
(See Fig. 7 and Table 2.)
This will not allow contactor to be energized.
•Disconnect power to unit and interchange 2 field-wiring
leads on unit contactor.
FINAL WIRING CHECK
IMPORTANT: Check factory wiring and field-wire connections
to ensure terminations are secured properly. Check wire routing to
ensure wires are not in contact with tubing, sheet metal, and so
forth.
Step 13—Check Charge
Step 10—Compressor Crankcase Heater
Factory charge is shown on unit-rating plate. To check charge in
cooling mode, refer to Cooling-Only Procedure on unit wiring and
charging label.
When equipped with a crankcase heater, furnish power to heater a
minimum of 24 hr before starting unit. To furnish power to heater
4
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COOLING-ONLY PROCEDURE
NOTE: If superheat- or subcooling-charging conditions are not
favorable, charge must be weighed in accordance with unit-rating
plate ±0.6 oz/ft of 3/8-in. liquid line above or below 15 ft
respectively.
EXAMPLE:
To calculate additional charge required for a 25-ft line set:
25 ft – 15 ft = 10 ft X 0.6 oz/ft = 6 oz of additional charge
HEATING CHECK-CHART PROCEDURE
To check system operation during heating cycle, refer to the
Heating Check Chart on outdoor unit. This chart indicates whether
a correct relationship exists between system operating pressure and
air temperature entering indoor and outdoor units. If pressure and
temperature do not match on chart, system-refrigerant charge may
not be correct. Do not use chart to adjust refrigerant charge.
NOTE: When charging is necessary during heating season,
charge must be weighed in accordance with unit rating plate ±0.6
oz/ft of 3/8-in. liquid line above or below 15 ft respectively.
A00010
Table 2—Phase-Monitor LED Indicators
LED
OFF
STATUS
Step 14—Final Checks
No call for compressor
operation
IMPORTANT: Before leaving job, be sure to do the following:
1. Securely fasten all panels and covers.
FLASHING
ON
Reversed phase
Normal
2. Tighten service valve-stem caps to 1/12-turn past finger-tight.
Fig. 7—Phase-Monitor Control
3. Leave User’s Manual with owner. Explain system operation
and periodic maintenance requirements outlined in manual.
4. Fill out Dealer Installation Checklist and place in customer
file.
5
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FA, FB, FC,
FD, FF, FH
FAN COIL
ONE
OUTDOOR
THERMOSTAT
OTHER
NON-PROGRAMMABLE
HP THERMOSTAT
FA, FB, FC,
FD, FF
FAN COIL
OTHER
HP THERMOSTAT
HEAT
PUMP
HEAT
PUMP
ODT
R
C
W3
R
R
R
C
24 VAC HOT
24 VAC COM
HEAT STAGE 2
R
C
24 VAC HOT
24 VAC COM
HEAT STAGE 2
R
C
C
C
W2
W2
W
Y
W2
Y
W2
W2
COOL/HEAT
STAGE 1
COOL/HEAT
STAGE 1
Y
E
G
G
INDOOR FAN
G
Y
INDOOR FAN
G
O
O
E
RVS COOLING
RVS COOLING
O
O
EMERGENCY
HEAT
EMERGENCY
HEAT
E
NOTE: Remove wires from crimp nut in indoor fan coil
when installing outdoor thermostat.
IMPORTANT: When using outdoor thermostat, W must be
2
energized when requesting supplemental heat.
CARRIER
CARRIER
PROGRAMMABLE
THERMOSTAT
MODEL HP
PROGRAMMABLE
THERMOSTAT
MODEL HP
40FKA
FK4C
FAN COIL
FA, FB, FC,
FD, FF, FH
FAN COIL
HEAT
PUMP
HEAT
PUMP
DH
R
J1 JUMPER
R
R
G
R
24 VAC HOT
INDOOR FAN
HEAT STAGE 2
R
24 VAC HOT
INDOOR FAN
HEAT STAGE 2
R
G
G
G
*
W2
W2
W/W1
Y/Y2
W/W1
Y/Y2
W1
W2
*
*
E
COOL/HEAT
STAGE 1
COOL/HEAT
STAGE 1
J2 JUMPER
W3
W2
Y
RVS COOLING O/W2
RVS COOLING O/W2
Y
Y/Y2
O
NOT USED
Y1/W2
O
NOT USED
Y1/W2
O
C
C
C
B
L
24 VAC COM
NOT USED
TROUBLE
C
B
L
C
24 VAC COM
NOT USED
TROUBLE
C
Y1
IF AVAILABLE
*
S1
S2
OPTIONAL
OUTDOOR
SENSOR
S1
S2
OPTIONAL
OUTDOOR
SENSOR
CONNECTION
CONNECTION
CARRIER
PROGRAMMABLE
THERMOSTAT
MODEL HP
CARRIER
ONE
OUTDOOR
THERMOSTAT
FA, FB, FC,
FD, FF, FH
FAN COIL
TWO
OUTDOOR
PROGRAMMABLE
THERMOSTAT
MODEL HP
FA, FB, FC, FD, FF, FH
FAN COIL
HEAT
PUMP
HEAT
PUMP THERMOSTATS
ODT
W3
R
W3
R
R
G
24 VAC HOT
INDOOR FAN
HEAT STAGE 2
R
G
24 VAC HOT
INDOOR FAN
HEAT STAGE 2
EHR
R
R
G
G
W/W1
Y/Y2
W/W1
Y/Y2
ODT
W2
W2
W2
Y
W2
COOL/HEAT
STAGE 1
COOL/HEAT
STAGE 1
E
RVS COOLING O/W2
EHR
Y1/W2
RVS COOLING O/W2
Y
O
NOT USED
NOT USED
Y1/W2
ODT
O
E
C
C
B
L
24 VAC COM
NOT USED
TROUBLE
C
B
L
24 VAC COM
NOT USED
TROUBLE
EHR
C
C
C
S1
S2
S1
S2
OPTIONAL
OUTDOOR
SENSOR
OPTIONAL
OUTDOOR
SENSOR
CONNECTION
CONNECTION
NOTE: Remove wires from crimp nut in indoor fan coil
when installing outdoor thermostats.
NOTE: Remove wires from crimp nut in indoor fan coil
when installing outdoor thermostat.
IMPORTANT: When using outdoor thermostats, W must be
2
energized when requesting supplemental heat.
IMPORTANT: When using outdoor thermostat, W must be
2
energized when requesting supplemental heat.
A01384
Fig. 6—Typical 24v Circuit Connections
6
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WIRING DIAGRAM NOTES:
When thermostat is satisfied, its contacts open, de-energizing
contactor and sequencer. All heaters and motors should stop.
1. CARRIER THERMOSTAT-WIRING DIAGRAMS ARE
ONLY ACCURATE FOR MODEL NUMBERS BEGINNING
WITH TSTAT_ _ _ _ _ _ _.
When the thermostat is satisfied, its contacts open, de-energizing
contactor and sequencer. All heaters and motors should stop.
2. WIRING MUST CONFORM TO NEC OR LOCAL CODES.
3. SOME UNITS ARE EQUIPPED WITH PRESSURE
SWITCH(ES), TEMPERATURE SWITCH, OR 5–MINUTE
COMPRESSOR-CYCLE PROTECTION. CONNECT 24V
FIELD WIRING TO FACTORY-PROVIDED STRIPPED
LEADS.
→ Quiet Shift
Quiet Shift is a field-selectable defrost mode, which will eliminate
occasional noise that could be heard at the start of the defrost cycle
and restarting of heating cycle. It is selected by placing DIP switch
3 (on defrost board) in ON position.
4. THERMOSTATS ARE FACTORY CONFIGURED WITH
5-MINUTE COMPRESSOR-CYCLE PROTECTION AND
When Quiet Shift switch is placed in ON position, and a defrost is
initiated, the following sequence of operation will occur. Revers-
ing valve will energize, compressor will turn off for 30 sec, then
turn back on to complete defrost. At the start of heating cycle after
conclusion of defrost mode, reversing valve will de-energize, the
compressor will turn off for another 30 sec, and the fan will turn
off for 40 sec, before starting in the heating mode.
4-CYCLES-PER-HR
LIMIT.
SEE
THERMOSTAT-
INSTALLATION INSTRUCTIONS FOR DETAILS.
5. TO STAGE ELECTRIC-RESISTANCE HEAT, CONSULT
OUTDOOR THERMOSTAT-INSTALLATION INSTRUC-
TIONS.
6. UNDERLINED LETTER ON DUAL TERMINAL INDI-
CATES ITS USAGE.
FOR EXAMPLE: O/W2 MEANS O; O/W2MEANS W2
7. OUTDOOR-TEMPERATURE SENSOR MUST BE AT-
TACHED IN ALL DUAL-FUEL INSTALLATIONS. JUMPER
WIRE BETWEEN O/W2 AND L THERMOSTAT TERMINALS
MUST BE PRESENT.
8. Y1 AND O CONNECTIONS TO 2–STAGE FURNACES
MAY NOT EXIST OR MAY ONLY BE A WIRE RATHER
THAN A SCREW TERMINAL.
SEQUENCE OF OPERATION
NOTE: Defrost-control board is equipped with 5-minute lockout
timer that may be initiated upon any interruption of power.
With power supplied to indoor and outdoor units, transformer is
energized.
CESO130076–00
Speedup
Pins
Quiet
Shift
Defrost interval
DIP switches
Cooling
A91444
On a call for cooling, thermostat makes circuits R-O, R-Y, and
R-G. Circuit R-O energizes reversing valve, switching it to cooling
position. On 3-phase models with scroll compressors, the units are
equipped with a phase monitor to detect if the incoming power is
correctly phased for compressor operation. If phasing is correct,
circuit R-Y energizes contactor, starting outdoor-fan motor and
compressor circuit. R-G energizes indoor unit-blower relay, start-
ing indoor-blower motor on high speed.
→
Fig. 8—Defrost Control
→ Defrost
The defrost control is a time/temperature control which includes a
field-selectable time period (DIP switch 1 and 2 on the board)
between defrost cycles of 30, 60, 90, or 120 minutes (factory set at
90 minutes).
NOTE: If the phasing is incorrect, the contactor will not be
energized. To correct the phasing, interchange any 2 of the 3
power connections on the field side.
To initiate a forced defrost, two options are available depending on
the status of the defrost thermostat.
If defrost thermostat is closed, speedup pins (J1) must be shorted
by placing a flat head screwdriver in between for 5 sec and
releasing, to observe a complete defrost cycle. When the Quiet
Shift switch is selected, compressor will be turned off for two 30
sec intervals during this complete defrost cycle as explained
previously. When Quiet Shift switch is in factory default OFF
position, a normal and complete defrost cycle will be observed.
When thermostat is satisfied, its contacts open, de-energizing the
contactor and blower relay. Compressor and motors should stop.
NOTE: If indoor unit is equipped with a time-delay relay circuit,
the blower runs an additional 90 sec to increase system efficiency.
Heating
On a call for heating, thermostat makes circuits R-Y and R-G. If
phasing is correct, circuit R-Y energizes contactor, starting
outdoor-fan motor and compressor. Circuit R-G energizes indoor-
blower relay, starting blower motor on high speed.
If defrost thermostat is in open position, and speedup pins are
shorted (with a flat head screwdriver) for 5 sec and released, a
short defrost cycle will be observed (actual length is dependent
upon the selected Quiet Shift position). When Quiet Shift switch is
in ON position, the length of defrost is 1 minute (30 sec
compressor off period followed by 30 sec of defrost with com-
pressor operation). On return to heating operation, compressor will
again turn off for an additional 30 sec and the fan for 40 sec. When
the Quiet Shift is in OFF position, only a brief 30 sec cycle will be
observed.
Should temperature continue to fall, R-W2 is made through
second-stage room-thermostat bulb. Circuit R-W2 energizes a
sequencer, bringing on first bank of supplemental electric heat and
providing electrical potential to second heater sequencer (if used).
If outdoor temperature falls below setting of outdoor thermostat
(field-installed option), contacts close to complete circuit and bring
on second bank of supplemental electric heat.
7
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If it is desirable to observe a complete defrost in warmer weather,
the thermostat must be closed as follows:
Step 1—Final Checks
IMPORTANT: Before leaving job, be sure to do the following:
1. Securely fasten all panels and covers.
1. Turn off power to outdoor unit.
2. Disconnect outdoor fan motor lead from OF2 on control
board. (See Fig. 8.) Tape to prevent grounding.
2. Tighten service valve stem caps to 1/12-turn past finger tight.
3. Leave User’s Manual with owner. Explain system operation
3. Restart unit in heating mode, allowing frost to accumulate on
outdoor coil.
and periodic maintenance requirements outlined in manual.
4. After a few minutes in heating mode, liquid line temperature
should drop below closing point of defrost thermostat (ap-
proximately 30°F).
CARE AND MAINTENANCE
For continuing high performance and to minimize possible equip-
ment failure, periodic maintenance must be performed on this
equipment.
NOTE: Unit will remain in defrost until defrost thermostat
reopens at approximately 80°F coil temperature at liquid line or
remainder of defrost cycle time.
Frequency of maintenance may vary depending upon geographic
areas, such as coastal applications.
5. Turn off power to outdoor and reconnect fan motor lead to
OF2 on control board after above forced defrost cycle.
Copyright 2002 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231
38ycw3si
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book
Tab 5a 5a
1
4
PC 101
Catalog No. 533-80020
Printed in U.S.A.
Form 38YCW-3SI
Pg 8
2-02
Replaces: 38YCC-4SI
Download from Www.Somanuals.com. All Manuals Search And Download.
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