Carrier 38QRA User Manual

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HEATING & COOLING

Heat Pumps—Outdoor Section

Installation and Start-Up Instructions

NOTE: Read entire instruction before beginning installation.

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock or other condi tions which may cause 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 pack aged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly and follow all warning or cautions attached to the unit. Consult local building codes and National Electrical Code (NEC) for special require ments.

It is important to 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 word— DANGER, WARNING, or CAU TION. 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 that 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.

38QRA

Й1

À WARNING

Before installation or servicing system, always turn off main power to system. There may be more than one disconnect switch. Turn off accessory heater power if applicable. Elec trical shock can cause personal injury or death.

INSTALLATION

Step 1—Check Equipment

Unpack unit and move to final location. Remove carton taking care not to damage unit.

Inspect equipment for damage prior to installation. File claim with

shipping company if shipment is damaged or incomplete. Locate rating plate on unit. 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 mounting feet provided in unit base. Refer to unit mounting pattern to determine base size and knockout hole locations. (See Fig. 2.)

Allow sufficient space for airflow clearance, wiring, refrigerant piping and servicing of unit. Locate unit so condenser airflow is unrestricted on both sides. A minimum 6-in. (152mm) clearance above and 6 ft (1.83m) between units must be maintained. (See Fig. 2.)

Fig. 1—Model 38QRA

be mounted on a level pad directly on base legs or

g m>mt( ШОП accessory snow stand at support points. See Fig. 2 and

4^^Р^ВДег of gravity. Position unit so water or ice from roof

i^aqjpt drop directly onto unit.

levate Unit

: drainage the heat pump must be raised off the mounting surface? Use accessory snow rack or ice stand where prolonged subfreezing temperatures or heavy snow occur. Refer to separate installation instructions packaged with these accessories.

In rooftop applications, locate unit at least 6 in. (152mm) above roof surface on a level platform or frame. Place unit above a loadbearing 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 govern ing rooftop applications.

RIGGING When lifting unit for rooftop mounting, keep unit upright. Lift unit

using a sling. Use cardboard or padding under sling, and spreader bars to prevent sling damage to unit. (See Fig. 4.) See Figs. 2 and 4 for center of gravity reference. Install unit so that coil does not face into prevailing winds. If this cannot be done, and constant

A90280

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

Book 1 4 Tab 5a 5a

PC 101 Catalog No. 533-858

Printed in U.S.A. Form 38QRA-1SI

Pg 1

10-91

Replaces: New

1-6

HIGH VOLTAGE

1-1/8' DIA.

CLEARANCES FOR SERVICE AND AIRFLOW. ALLOW 6 IN. ABOVE UNIT.

SIN.

TOP VIEW

B'i i COMPr'i

3FT

V J* ' - - '

~UU LfCr

A90304

UNIT SIZE

018—036 10

036 30

048-060 1 & 30

In.

16 406.4 18-7/16 18-7/16

(mm)

468.3

Fig. 2—Dimensional Drawing—38QRA018—060

winds above 25 mph are expected, use Accessory Wind Baffle, part number KSAWBOIOIAAA or KSAWB0201AAA. See in structions provided with accessory kit for installation.

In. (mm)

36-15/16 938.2

In-. (mm)

23-7/16 595.3

44-9/16 1131.9 30-1/2 774.7 44-9/16 1131.9 30-1/2 774.7

A CAUTION

I Be sure unit panels are securely in place prior to rigging. [

Step A—Replace Indoor AccuRater® Piston, if required

Check indoor coil piston to see if it matches the required piston shown on unit rating plate. If it does not match, replace indoor coil piston with piston shipped with this unit. (See Fig. 5.) The piston shipped with outdoor unit is correct for any approved indoor coil combination. Note that Type A pistons are used on indoor units and Type B pistons are used on 38QRA outdoor units. Do not interchange piston types. (See Fig. 5.) For optimum cyclic perfor mance, installation of liquid solenoid valve is recommended. Consult local distributor for liquid solenoid valve kit and hard start

kit part number, if required.

UNIT SIZE

018—036 1 0 23x42

036 3 0 24 X 50

048—060 1 and 3 0

SUPPORT FEET

In.

24 X 50

Table 1—Minimum Mounting Pad Dimensions

SNOW STAND

(mm)

584.2 X 1066.8

609.6x 1270.0 28 X 50 711.2 X 1270.0

609.6 X 1270.0

In. (mm)

26 X 42

660.4 X 1066.8 26 X 42

28 X 50 711.2 X 1270.0

ICE STAND

In.

(mm)

660.4 X 1066.8 26x50 660.4 X 1270.0 26x50

660.4 X 1270.0

A CAUTION

DO NOT BURY MORE THAN 36 IN. (914mm) OF RE FRIGERANT TUBING IN GROUND. If any section of tubing is buried, there must be a 6-in.(152mm) vertical rise to the valve connections on the outdoor unit. If more than the recommended length is buried, refrigerant may migrate to cooler buried section during extended periods of unit shut down, causing refrigerant slugging and possible compressor damage at start-up.

Step 5—Make Piping Connections

Outdoor units may be connected to indoor sections using accessory tubing package or field-supplied tubing of refrigerant grade, correct size, and condition. The liquid- and vapor-tube diameters can be determined by using Table 3. For tubing requirements beyond 50 ft (15.24m), obtain information from your local distributor.

If either refrigerant tubing or indoor coil is exposed to atmospheric conditions for longer than 5 minutes, it must be evacuated to 1000 microns to eliminate contamination and moisture in the system.

Run refrigerant tubes as directly as possible, avoiding unnecessary turns and bends. Suspend refrigerant tubes so they do not damage insulation on vapor tube and do not transmit vibration to the structure. Also, when passing refrigerant tubes through the wall, seal opening so vibration is not transmitted to stmcture. Leave some slack in refrigerant tubes between structure and unit to absorb vibration.

OUTDOOR UNIT CONNECTED TO FACTORY APPROVED INDOOR UNIT — Outdoor unit contains holding refrigerant charge only. See Table 2 for correct system charge when con nected by 25 ft (7.62m) of field-supplied or factory accessory tubing. Add charge as required to achieve correct total. For long line application information, contact your local distributor.

CARRIER CORP.

MODEL N0. SERIAL N0.

1 DF.SIGN/TEST PRESSURE GAGE 1

HIGH PSI 300 kPa 2068

TSEZ'PSl

COMPRESSOR FAN MOTOR

powgPi Supply

VOLTAGE RAN5F MIN ¿I

SYSTEM

IN 46206

150 TPo 1034

VOLTS AC

EHÜI £LA

VOLTS

MAX MIN

IMAX■ FU5E/HASR TyRE'';CB; AHPT

PER Installation InSFRuCHW

V MADE IN MEXICO

Fig. 3—Unit Rating Piate

SUITABLE FOR

OUTDOOR USE

REFRIGERANT:

R-22

HOLDING CHARGE

PI5T0N

Phi Ih7I

CERTIFICATION APPLIES QH.Y

IKN THE CO(f>LETE SYSTD1

IS LISTED WITH ARI

I 317204-401 REV.

LBS kg

A90282

Table 2—Refrigerant Charge

OUTDOOR

UNIT

018 024 1 030 036 036 048 060

PHASE

1 1

3 1 &3 9.44 1 &3

CHARGE (LB)

4.25

4.75

6.00

7.00

11.63

11.75

Table 3—Refrigerant Connections and Recom

mended Liquid and Vapor Tube Diameters (In.)

UNIT SIZE

018,024,030 3/8

036 3/8 3/8 048 3/8 3/8 7/8 060 3/8 3/8 7/8

Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult Long-Line Application Guideline.

LIQUID

Connect

Dia

Tube

Dia 3/8

REFRIGERANT TUBING — Connect tubing to fittings on out door unit vapor and liquid service valves. (See Fig. 2.) Remove brass piston retainer. Insert outdoor piston shipped in bag with indoor piston in the liquid service valve, replace brass piston retainer and connect sweat adapter provided. (See Fig. 5.)

VAPOR

Connect

Dia 5/8 3/4

Tube

Dia 5/8 3/4 7/8

1-1/8

Fig. 4—Rigging

A90285

A CAUTION

A brazing shield MUST be used when tubing sets ate being brazed to the service valves to prevent damage to the painted unit surface.

A CAUTION

To avoid valve damage while brazing, service valves must be wrapped with a heat-sinking material such as a wet cloth.

FILTER DRIER — Install in field liquid line, if used. SWEAT CONNECTION — Use refrigerant grade tubing. Service

valves are closed from factory and ready for brazing. After wrapping the service valve with a wet cloth, the tubing set can be brazed to the service valve using either silver bearing or non-silver bearing brazing material. Consult local code requirements. Refrig erant tubing and indoor coil are now ready for leak testing. This check should include all field and factory joints.

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