Carrier 38YSA048 SERIES310, 38YSA042 SERIES300, 38YSA036 SERIES300 Installation Guide

H_.AllI_I &CO01JI_G

Visit www.camer.com

Installation and Start-Up Instructions

NOTE: Read the entire instruction manual before starting the

installation.

This symbol --4 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 fu'e 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. NOTE is used to highlight
suggestions which will result in enhanced installtion, reliability, or
operation.

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 Iraced to
gas pulsations from improper installation of equipment.

1. Locate unit away from windows, patios, decks, etc. where unit

operation sounds 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 tarns 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.)

38YSA

Split-System Heat Pump

A98516

Fig. 1--Model 38YSA

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.
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. Refer to
Product Data Digest for appropriate part number. Obtain filter

drier from service parts or your distributor or branch.

INSTALLATION

Step l_heck Equipment and Job Site

UNPACK UNIT
Move to final location. Remove carton taking care not to damage

unit.

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

PC 101 Catalog No. 533-80022 Pnnted in U.S.A.

Form 38YSA-4SI

1 02-02 Replaces: 38YSA3S}

Pg

NOTE:Avoidcontactbeiween tubingandstmctum

OUTDOOBWALL-- INDOOBWAL 7

KNOCKOUTSiN BASEPAN

12)PLACES

CAULK_ LIQUIDTUBE

SULATION

.._ L-..VAPOR TUBE

THROUGHTHE WALL

E_\ j-- INSULATION

i _VAPOR TUBE

k #•

1 MIN. _ _ _

LIQUtDTUBE

SUSPENSION

A94028

Fig. 2--Connecting Tubing Installation

INSPECT EQUIPMENT

F'de claim with shipping company prior to installation if shipment

is damaged or incomplete. Locate unit rating plate on unit comer
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 m pad, tie
down bolts should be used and fastened through knockouts
provided in unit base pan. Refer to unit mounting patternin Fig. 3

to determine base pan size and knockout hole location.

On rooftop applications, mount on level platform or frame 6 in.
above roof surface.. Place unit above a load-hearing 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-Ambinnt

Guideline for wind baffle construction.

NOTE: Unit must be level to within _+ 2 ° (_+3/8 inJft) per

compressor manufacturer specifications.

A

VIEW FROM TOP

83/16 _

A97548

Dimensions (in.)

MINIMUMMOUNTING

UNIT LOCATIONS

SIZE

PAD DIMENSIONS

Support Snow

Feet Stand

024-042 4 9-3/4

048 5-5/16 11-13/16

26 X 32 31 X 35

34X42 36X46

TIEDOWN KNOCKOUT

A B

Fig. 3_Mounting Unit to Pad

Step 4-----Operating Ambients

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 beating mode

is 66°F.

Step 5_Elevate Unit

IriX[,-_._

Accumulation of water and ice in base pan may cause

equipment damage.

Elevate unit per local climate and code requirements to provide
clearance above estimated snowfall level and ensure adequate
drainage of unit. Fig. 4 shows unit with accessory support feet
installed. Use accessory snow stand in areas where prolonged
freezing temperatures are encountered. Refer to separate Installa-
tion Instructions packaged with accessories.

Step 3_Clearancs 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 I 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.

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

A98533

Fig. 4_Accessory Support Feet

2

Step 6--Thermostatic Expansion Valve

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

or pistons.

Due to system design, this unit must be installed with a
factory-listed indoor section. Non-approved coils could cause
performance and rehahility problems. Refer to pre-sale litera-

ture for approved indoor sections.

The outdoor section is factory equipped with a hard shut-off TXV
for metering refrigerant during heating mode. See Fig. 5 and 6 for

location of TXV and sensing bulb. This heat pump must be

matched with an approved indoor fan coil equipped with a hard

shut-off TXV. See Product Data literature for approved indoor
units.

Step 7_heck 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 robe going into outdoor coil. At the end of 1 of the
feeder tubes, there is a 3/8-in. O.D. stub tube approximately 3 in.
long. (See Fig. 7.) The defrost thermostat should be located on stub
tube. Note that there is only l stub tube used with liquid header,

and on most units it is the bottom circuit.

Step 8--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.

DEFROST

THERMOSTAT

A9_17

Fig. 7--Defrost Thermos_t Location

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 accessory
tubing package or field-supplied refrigerant grade tubing of correct
size and condition. For tubing requirements beyond 50 It, substan-
tial 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 fine length. Refer to Table 2 for

accessory requirements.

o'o og, LocK7

"_" SUCTION TU

8 O'CLOCK

7/aIN.OD & SMALLER

Fig, 5--Positioning of Sensing Bulb

SENSING

4 O'CLOCK

LARGER THAN 7/sIN. OD

A81032

SENSING BULB---_

STRAINER TX_

A96433

Fig. 6_TXV Location on Outdoor Section

3

Table 1--Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (In.)

UNIT LIQUID VAPOR VAPOR (LONG LINE)

SIZE Connection Diameter Tube Diameter Connection Diameter Tube Diameter Connection Diameter Tube Diameter

024 3/8 3/8 5/8 5/8 5/8 3/4

030, 036 3/8 3/8 314 3/4 3/4 7/8
042, 048 3/8 3/8 7/8 7/8 7/8 7/8

NOTES:

1. Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft, consult Residential Split System L0ng-Line Application Guideline.

2. Do not apply capillaw tube indoor coils to these units.

For buried-line applications greater than 36 in., consult your local
distributor.

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.

OUTDOOR UNIT CONNECTED TO FACTORY-APPROVED

INDOOR UNIT

Outdoor unit contains correct system refrigerant charge for opera-

don with indoor unit of same size when connected by 15 ft of

field-supplied or factory-accessory tubing. Check refrigerant
charge for maximum efficiency.

REFRIGERANT TUBING

Connect tubing to fittings on outdoor unit vapor and liquid service

valves. (See Table 1.) Use refrigerant grade tubing.

SWEAT CONNECTION

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 non-silver bearing

brazing material. Consult local code requirements. Refrigerant

tubing and indoor coil are now ready for leak testing. This check

should include all field and factory joints.

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.

Step 9_Make Electrical Connections

To avoid personal injury or death, do not supply power to unit
with 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 shown
on unit rating plate, Contact local power company for correction of
improper voltage. See unit rating plate for recommended circuit

protection device.

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 may fluctuate above or below

permissible limits.

NOTE: Use copper wire only between disconnect switch and

unit.

NOTE: Install branch circuit disconnect of adequate size per

NEC to handleunit starting current.Locatedisconnectwithin sight

from and readily accessible from unit, per Section 440-14 of NEC.
ROUTE GROUND AND POWER WIRES

Remove access panel and control box cover to gain access to unit

wiring. Extend wires from disconnect through power wiring hole
provided and into unit control box.

Table 2--Accessory Usage

REQUIRED FOR REQUIRED FOR

ACCESSORY LOW-AMBIENT LONG-LINE

Crankcase Heater Yes Yes

Evaporator Freeze Thermostat Yes No

Accumulator No No

Compressor Start Assist

Capacitor and Relay Yea Yes

MotorMaete_ Control,

Low-Ambient Pressure Switch

Liquid-Line Solenoid Valve See Long-Line

Ball Bearing Fan Motor Yes t No

• For tubinglinesets between50 and 175 ft. refer to ResidentialSplitSystem Lor_j-LineApplicationGuideline.
_:RequiredforLow-AmbientControllerIfollmodulation feature)and MotorMasterControl only.

or Yes No

Wind Baffle See Low-Ambient Instructions No

Support Feet Recommended No

or No Application

Hard Shutoff TXV Guideline

APPLICATIONS APPLICATIONS*

(BELOW 55"F) (OVER 50 FT)