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38YDA

Two-Speed 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.

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

Summary of Contents for 38YDA

Page 1: ...rom 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...

Page 2: ...door operating ambient in cooling mode is 55 F and the maximum outdoor operating ambient in cooling mode is 125 F The maximum outdoor operating ambient in heating mode is 66 F Step 5 Elevate Unit Accu...

Page 3: ...uct Data Sheet for factory approved indoor units Outdoor unit contains correct system refrigerant charge for opera tion with indoor unit of same size when connected by 15 ft of field supplied or facto...

Page 4: ...for 2 speed units Do not attempt to operate unit below 55 F in cooling mode or modify control system for low ambient operation Compressor dam age may occur Available electrical accessories include lat...

Page 5: ...ate unit in a vacuum or at negative pressure Do not disable low pressure switch In scroll compressor applications Dome temperatures may be hot To prevent personal injury wear safety glasses protective...

Page 6: ...LE THERMOSTAT MODEL 2S TYPICAL FAN COIL TWO SPEED HEAT PUMP See notes 7 8 9 and 11 W2 G W2 O R W3 R L H R1 COOL HEAT STAGE 1 COOL HEAT STAGE 2 24 VAC HOT Y Y2 A D A97498 R C C Y1 W3 O TYPICAL FAN COIL...

Page 7: ...UMPER J2 JUMPER TWO SPEED HEAT PUMP See notes 7 8 9 11 and 23 DH Y1 Y1 W W1 O W2 Y1 W2 O W1 Y Y2 Y2 W2 W3 Y Y2 O W2 COOL HEAT STAGE 1 COOL HEAT STAGE 2 HEAT STAGE 3 RVS COOLING H A98628 R Y2 R Y2 C C...

Page 8: ...FURNACE TWO SPEED HEAT PUMP See notes 7 9 11 14 and 24 W R Y1 R O W2 G L W3 Y H R1 FAN HEAT STAGE 3 RVS COOLING 24 VAC HOT K A98587 24 VAC HOT 24 VAC COMM HEAT STAGE 3 R C G W W1 Y Y2 R C RVS COOLING...

Page 9: ...C Y2 W3 W2 R Y1 O C DHUM HUM B S1 S2 R C HEAT STAGE 3 COOL HEAT STAGE 2 RVS COOLING FAN 24 VAC HOT 24 VAC COMM N A HUMIDIFY See notes 7 11 14 15 16 17 18 and 25 N A OUTDOOR SENSOR CONNECTION Y Y2 HUM...

Page 10: ...W2 Y1 W2 24 VAC COMM N A OUTDOOR SENSOR CONNECTION C B S1 S2 CARRIER PROGRAMMABLE THERMOSTAT MODEL 2S G H R1 FAN HEAT STAGE 3 COOL HEAT STAGE 2 RVS COOLING 24 VAC HOT P A97497 24 VAC HOT 24 VAC COM HE...

Page 11: ...CE WITH ICM BLOWER MOTOR TWO SPEED HEAT PUMP See notes 6 7 9 11 12 14 21 and 24 R Y1 R O G L W3 W W1 Y Y2 W2 Y1 COOL HEAT STAGE 2 FAN HEAT STAGE 3 RVS COOLING 24 VAC HOT W A97496 R C C W2 TWO STAGE VA...

Page 12: ...3 W2 O C DHUM HUM B S1 S2 R W2 O Y1 R COM HUM PL9 10 DEHUM HEAT STAGE 3 HEAT COOL STAGE 1 HEAT COOL STAGE 2 RVS COOLING FAN 24 VAC HOT 24 VAC COM DEHUMIDIFY HUMIDIFY N A OUTDOOR SENSOR CONNECTIONS Y Y...

Page 13: ...t pump MUST have a high pressure switch for dual fuel applications 15 Outdoor air temperature sensor must be attached in all dual fuel applications 16 Thermidistat Dip Switch 1 should be set in the ON...

Page 14: ...w Selection for 58MVP Furnaces CFM 38YDA UNIT SIZE HIGH SPEED A C SETUP SWITCH POSITION FURNACE MODEL HEATING SIZE LOW SPEED CF SETUP SWITCH POSITION 060 080 100 A C 1 A C 2 A C 3 High Low High Low Hi...

Page 15: ...ersects measured liquid service valve pressure 6 To obtain required subcooling temperature at a specific liquid line pressure add refrigerant if liquid line temperature is higher than indicated or rec...

Page 16: ...door coil heat and minimize the steam cloud effect SECOND STAGE LATCHING Mechanical thermostats operate with a staging differential of 2 F droop Carrier electronic thermostats are droopless meaning th...

Page 17: ...ature The cycle terminates when coil thermistor reaches 80 F 5 or defrost period reaches a maximum of 10 minutes FURNACE INTERFACE This feature provides a heat pump lockout upon a demand for auxiliary...

Page 18: ...appears at control board If a PTC trip occurs 3 times the control locks out outdoor unit operation and provides a malfunction signal at control PRESSURE SWITCH PROTECTION The outdoor unit is equipped...

Page 19: ...s the resistance decreases A thermistor is used to sense outdoor ambient Refer to Fig 14 for resistance values versus temperature If outdoor ambient thermistor should fail a malfunction signal appears...

Page 20: ...e Training plus hands on the products in our labs can mean increased confidence that really pays dividends in faster troubleshooting fewer callbacks Course descriptions and schedules are in our catalo...

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