Carrier 38BYC, 38BYG User Manual

0 (0)

38BYC, 38BYG 12 SEER Split System Heat Pump

Visit www.carrier.com

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 thoroughly 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 CAUTION. These words are used with the safety-alert symbol. DANGER 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.

Before installing, modifying, or servicing system, main electrical 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, and so forth where unit operation sounds may disturb customer.

2.Ensure that vaporand liquid-tube diameters are appropriate to capacity of unit.

3.Run refrigerant tubes as directly as possible by avoiding unnecessary turns and bends.

A98525

Fig. 1—Model 38BYG

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 that comes in direct contact with tubing. (See Fig. 2.)

8.Ensure that tubing insulation is pliable and completely surrounds 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 operation, check refrigerant charge using charging information located on control box cover.

IMPORTANT: Maximum liquid line size is 3/8-in. O.D. for all residential applications including long line.

IMPORTANT: Always install a liquid line filter drier on any system using existing field service line sets and or existing indoor coil or fan coil units. Always use a filter direr on burnout unit replacements.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book

1

4

PC 101

Catalog No. 533-80078

Printed in U.S.A.

Form 38BYC-3SI

Pg 1

11-02

Replaces: 38BYC-2SI

Tab

5a

5a

 

 

 

 

 

 

 

Carrier 38BYC, 38BYG User Manual

NOTE: Avoid contact between tubing and structure

OUTDOOR WALL INDOOR WALL

CAULK

LIQUID TUBE

VAPOR TUBE

INSULATION

THROUGH THE WALL

JOIST

HANGER STRAP

(AROUND VAPOR

TUBE ONLY) INSULATION VAPOR TUBE

1″ MIN.

LIQUID TUBE

SUSPENSION

A94028

Fig. 2—Connecting Tubing Installation

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 service 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 knockouts provided in unit base pan. Refer to unit mounting pattern in Fig. 3 to determine base pan size and knockout hole location.

On rooftop applications, mount on level platform or frame. Place unit above a load bearing wall and isolate unit and tubing set from structure. Arrange supporting members to adequately support unit and minimize transmission of vibration to building. Consult local codes governing rooftop applications.

Roof mounted units exposed to winds above 5 mph may require wind baffles to achieve adequate defrost. Consult Low Ambient Guideline for wind baffle construction.

NOTE: Unit must be level to within ± 2° (± 3/8 in./ft) per compressor manufacturer specifications.

Step 3—Clearance Requirements

When installing, allow sufficient space for airflow clearance, wiring, refrigerant piping, and service. Allow 30-in. clearance to service end of unit and 48 in. above unit. For proper airflow, a 6-in. clearance on 1 side of unit and 12 in. on all remaining sides must be maintained. Maintain a distance of 24 in. between units. Position so water, snow, or ice from roof or eaves cannot fall directly on unit.

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

38″ D. (9.53) TIEDOWN

 

 

 

 

 

 

A

 

 

 

 

KNOCKOUTS (2) PLACES

 

 

 

 

 

 

 

B

 

 

 

 

 

 

 

A94199

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dimensions (In.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

UNIT

 

MINIMUM

TIEDOWN KNOCKOUT LOCATIONS

MOUNTING-PAD

 

 

 

 

 

 

 

 

SIZE

A

 

 

B

 

 

C

 

DIMENSIONS

 

 

 

 

 

 

 

 

 

 

 

 

018-024

 

22-1/2 X 22-1/2

3-11/16

 

 

18-1/8

 

14-3/8

030-060

 

30 X 30

6-1/2

 

 

23-1/2

 

20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fig. 3—Mounting Unit to Pad

On rooftop applications, locate unit at least 6 in. above roof surface.

Step 4—Operating Ambient

The minimum outdoor 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

Accumulation of water and ice in base pan may cause equipment damage.

In areas where prolonged freezing temperatures are encountered, elevate unit per local climate and code requirements to provide clearance above estimated snowfall level and ensure adequate drainage of unit.

Step 6—Remove Indoor AccuRater® Piston and Install TXV

For proper unit operation and reliability, units must be installed with field supplied hard shutoff TXV. Do not install with evaporator coils having capillary tube metering devices or pistons.

For TXV kit part number and charging instructions, refer to TXV label in outdoor unit. If indoor unit (fan coil) comes factory equipped with a bi-flow hard shutoff TXV, no TXV change is required.

2

If TXV installation is required, remove existing AccuRater® from indoor coil. Refer to Figs. 4 and 5 and install TXV kit as follows:

1.Install suction tube adapter.

2.Install liquid flare-to-sweat adapter.

3.Connect external equalizer tube to fitting on suction tube adapter.

4.Position sensing bulb on horizontal portion of suction tube adapter. Secure using supplied hardware.

5.Insulate bulb after installation. (See Fig. 5.)

6.Leak check all connections.

COIL

SENSING

BULB

EQUALIZER

TUBE

THERMOSTATIC

EXPANSION

VALVE

A88382

Fig. 4—Typical TXV Installation

10 O'CLOCK

2 O'CLOCK

STRAP

SUCTION TUBE

8 O'CLOCK

78 IN. OD & SMALLER

SENSING BULB

4 O'CLOCK

LARGER THAN 78 IN. OD

A81032

Fig. 5—Positioning of Sensing Bulb

Step 7—Check Outdoor AccuRater® Piston

Check outdoor unit piston. Remove retainer on liquid service valve and check piston size with matching number listed on outdoor unit rating plate.

Step 8—Check Defrost Thermostat

Check defrost thermostat to ensure it is properly located and securely attached. There is a liquid header with a brass distributor and feeder tube going into outdoor coil. At the end of 1 of the

feeder tubes, there is a 3/8-in. O.D. stub tube approximately 2 in. long. (See Fig. 6.) The defrost thermostat should be located on stub tube. Note that there is only 1 stub tube used with liquid header, and on most units it is the bottom circuit.

FEEDER TUBE

STUB TUBE

DEFROST

THERMOSTAT

A97517

Fig. 6—Defrost Thermostat Location

Step 9—Make Piping Connections

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.

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 longer than 36 in., refer to Application Guideline and Service Manual — Residential Split System Air Conditioners and Heat Pumps.

To prevent damage to unit or service valves observe the following:

•Use a brazing shield.

•Wrap service valves with wet cloth or use a heat-sink material.

Outdoor units may be connected to indoor section using accessorytubing package or field-supplied refrigerant grade tubing of correct size and condition. For tubing requirements beyond 50 ft, 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 equivalent line length. Refer to Table 2 for accessory requirements.

For buried line applications greater than 36 in., refer to Table 2 and Residential Split System Buried Line Application Guideline. Buried line applications may not exceed 100 ft.

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.

3

Loading...
+ 5 hidden pages