Carrier 38YDA- User Manual
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Table of Contents:
- Page 2 – Step 2—Install on a Solid, Level Mounting Pad; Unit must be level to within; Step 3—Clearance Requirements; If indoor unit is not equipped with a TXV, use an; Fig. 2—Connecting Tubing Installation; Fig. 4—Accessory Support Feet
- Page 3 – Step 7—Make Piping Connections; Fig. 6—Positioning of Sensing Bulb; SENSING BULB; Table 1—Refrigerant Connections and; UNIT
- Page 4 – Fig. 7—Line Power Connections; CONTACTOR
- Page 5 – Table 2—Wiring Diagram Reference
- Page 13 – WIRING DIAGRAM NOTES:; LEGEND; FIELD SPLICE CONNECTION
- Page 15 – Step 12—Check Charge; LIQUID
- Page 17 – Fig. 11—Typical Cooling Balance Points
- Page 18 – Table 10—Compressor PTC Ranges; COMPRESSOR INTERNAL PTC RESISTANCE; Fig. 13—Header Pin Housing Configuration
- Page 19 – WINDING; Fig. 14—Resistance Values Versus Temperature; THERMISTOR CURVE
- Page 20 – SERVICE TRAINING; • Unit Familiarization
38YDA
Two-Speed Split-System Heat Pump
Installation and Start-Up Instructions
NOTE:
Read the entire instruction manual before starting the
installation.
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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.
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.
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.
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 with a suitable warning label. Electrical shock can
cause personal injury or death.
INSTALLATION RECOMMENDATIONS
NOTE:
In some cases noise in the living area has been traced to
gas pulsations from improper installation of equipment.
1. Locate unit away from windows, patios, decks, etc. where unit
operation sound may disturb customer.
2. Ensure that vapor and liquid tube diameters are appropriate to
capacity of unit.
3. Run refrigerant tubes as directly as possible by avoiding
unnecessary turns and bends.
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.)
6. Avoid direct 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 which comes in direct contact with tubing.
(See Fig. 2.)
8. Ensure that tubing insulation is pliable and completely sur-
rounds vapor tube.
9. When necessary, use hanger straps which are 1 in. wide and
conform to shape of tubing insulation. (See Fig. 2.)
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 or in the Check Charge section of this
instruction.
IMPORTANT:
Maximum liquid-line size is 3/8-in. OD for all
residential applications.
IMPORTANT:
Always install a liquid-line filter drier. Refer to
Product Data Digest for appropriate part number. Obtain filter
driers from your distributor or branch.
INSTALLATION
Step 1—Check Equipment and Job Site
UNPACK UNIT
Move to final location. Remove carton taking care not to damage
unit.
INSPECT EQUIPMENT
File claim with shipping company prior to installation if shipment
is damaged or incomplete. Locate unit rating plate on unit corner
Fig. 1—Model 38YDA
A98516
Visit www.carrier.com
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
4
Tab
5a 5a
PC 101
Catalog No. 563-717
Printed in U.S.A.
Form 38YDA-2SI
Pg 1
11-98
Replaces: 38YDA1SI
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Summary
panel. It contains information needed to properly install unit.Check rating plate to be sure unit matches job specifications. Step 2—Install on a Solid, Level Mounting Pad If conditions or local codes require the unit be attached to pad, tiedown bolts should be used and fastened through knockoutspro...
1. Install suction tube adapter. 2. Install liquid flare-to-sweat adapter. 3. Install TXV on liquid flare-to-sweat adapter. 4. Connect external equalizer tube to fitting on suction tube adapter. 5. Position sensing bulb on horizontal portion of suction tube adapter. Secure using supplied hardware. I...
Step 8—Make Electrical Connections To avoid personal injury or death, do not supply power to unitwith compressor terminal box cover removed. Be sure field wiring complies with local and national fire, safety,and electrical codes, and voltage to system is within limits shownon unit rating plate. Cont...
