Carrier 38ED User Manual

Number One Ar Conditioning Maker

Installation, Start-Up "

Carrier Parkway • Syracuse, N Y 13221

Air-Cooled Condensing Units

INDEX

and Service Instructions

SAFETY CONSIDERATIONS

INSTALLATION........................................................1-6

Step 1 — Check Equipment and

Jobsite

................................................................

• UNPACK UNIT

• INSPECT EQUIPMENT

• COMPLETE OR CONSIDER SYSTEM REQUIREMENTS

Step 2 — Make Piping Connections

• REPLACE THE ACCURATER™ REFRIGERANT CONTROL PISTON IN THE INDOOR COIL IF REQUIRED

• CONNECT REFRIGERANT LINES

Step 3 — Install Solenoid on Indoor

Coil Liquid Line Fitting......................................3

Step 4 — Make Electrical

Connections

.......................................................

• INSTALL A BRANCH CIRCUIT DISCONNECT PER NEC

• ROUTE LINE POWER LEADS INTO UNIT

• CONNECT GROUND LEAD AND POWER WIRING

• CONNECT CONTROL POWER

WIRING

START-UP............................................................... 6-8

SERVICE.................................................................. 8-10 '

MAINTENANCE......................................................10-12

SAFETY CONSIDERATIONS

Installation and servicing of air conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and quali fied service personnel should install, repair or service air conditioning equipment.

Untrained personnel can perform basic mainte nance functions of cleaning coils and filters and re placing filters. All other operations should be per

formed by trained service personnel. When working

on air conditioning equipment, observe precautions

in the literature, tags and labels attached to the unit and other safety precautions that may apply.

..................................

_________

Page

Follow all safety codes. Wear safety glasses and work gloves. U se quenching cloth for brazing opera tions. Have fire extinguisher available for all brazing operations.

INSTALLATION

Step 1 — Check Equipment and Jobsite

UNPACK UNIT — Move to final location. Slide from carton taking special care not to damage serv ice valves or grilles.

INSPECT EQUIPMENT — File claim with ship ping company if damaged or incomplete. Check factory supplied (field installed) liquid line solenoid valve for shipping damage.

COMPLETE OR CONSIDER SYSTEM RE QUIREMENTS before installation;

Consult local building codes and National Elec trical Code (NEC) for special installation requirements.

When installing, allow sufficient space for airflow

clearance, wiring, refrigerant piping and service. Maintain a minimum of 4 ft clearance from obstruc tions above and 18 in. on sides of unit. Maintain a distance of 24 in. between condensing units. Posi tion so water from roof or eaves does not flow directly on unit.

Install on a solid, level mounting pad. It is not

necessary to attach unit to pad but if desired or required by local code, position tiedown bolts in pad. Fasten unit to pad using 2 holes provided in unit base. See Fig. 1.

Carrier Cooling System Capacity Optimization — AccuRater™ (bypass type) refrigerant control, with

field-replaceable piston (see Fig. 2), is supplied on evaporator. Use Optimization Chart, Table 2 to find AccuRater piston size required for condenser/ evaporator system being installed.

Form 38ED-1SI

4'-0" OVERHEAD SPACE REQUIRED FOR SERVICE AND AIRFLOW

l-t DIAM HOLE

FOR POWER WIRING

Table 1 — Physical Data (Refer to Fig. 1)

036

MODEL 38ED

OPER WT (lb) DIMENSIONS

Diameter A Unit Height B

CONNECTIONS {in )

Suction (ODF)* Liquid (ODF)*

REFRIG LINES (in )

Suction (ODF) Liquid (ODF)

*For a IVs-in suction line on 38ED036,042,048,060, a %-in x IVs-in

suction valve connection adapter is available as an accessory See Table 3

024 030

018

167 190

2-2'%( 2-8% ¡3-1%

190

2-5%

3/4 1'/e*

042 048 060

246

223*

3/4 3/8

3/s

278

248

3-2«/„

2-8% ( 3-2Vb4

LIQUID VALVE SERVICE PORT

CONDENSER AIRFLOW

1-6 AIRFLOW AND SERVICE

.CLEARANCE

SUCTION VALVE SERVICE PORT

Table 2 — Optimization Chart

(Outdoor air design temperature, db-F.

100 F and beiow)

MODEL

018

018 024 030 036 042 048 060

—

^63

-- —

— ___

- -

Factory-supplied piston Obtain replacement pistons thru local Carrier distributor

ACCURATER™ PISTON NO

Evap Size (Coil or Fan Coil)

024 030

— — — — —

036

TXV

—

042-

TXV

048

TXV

W№

■ 84 S

— — — — — —

060

TXV

28AR062

— —

TXV

■i:-:-v86

♦CONCRETE PAD SHOULD WEIGH TO 2 TIMES WEIGHT OF UNIT

Certified dimension drawings are available upon request

Fig. 1 — Dimensions. Connections and

Mounting Pad (Refer to Table 1)

When evaporator is more than 2 sizes larger than condensing unit (i.e. 38ED018I28HQ036), remove AccuRater and use a bleed-type thermal expansion

valve (TXV) for refrigerant control. Size TXV to

nominal capacity of condensing unit.

Replace piston, only if required (Table 2), before connecting refrigerant lines. Piston replacement in structions are included in evaporator installation book. After system installation is complete, use Charging Chart to check and/or adjust refrigerant charge.

Fig. 2 — AccuRater (Bypass Type)

Components

Condensing Units Connected to Carrier-Approved Evaporators — Condensing Units contain correct system refrigerant charge for operation with evap orator of the same size when connected by 25 ft or less of field-supplied or Carrier accessory tubing. Check refrigerant charge for maximum efficiency (see Refrigerant Charging, page 6).

Step 2 — Make Piping Connections — Con

densing units may be connected to evaporator sec tions using Carrier accessory tubing package (Table

3) or field-supplied tubing of refrigerant grade, correct size and condition (Table 1). For tubing requirements beyond 50 ft, obtain information from local Carrier distributor.

When 1-1/8 in. tubing is used (38ED036,042, 048,060) braze it to the accessory 1-1/8 x 3/4-in. suction connection adapter (Carrier Part No. 28VQ900011) or to correctly sized field-supplied adapter, then make Compatible Fittingconnections.

Isolate interconnecting tubing from framing and ductwork or where tubing runs thru stud spaces, en closed ceilings or pipe chases. Use isolation type hanger (Fig. 3) since rigid fastening transmits pulsa tions to structure creating objectionable sound.

PIPE HANGER

LIQUID LINE

Fig. 3 — Refrigerant Line Hangers

INSULATION

0" THICK)

Use 1-1/8 in. suction line on 38ED036,042,048

and 060 systems. A capacity reduction results if Carrier accessory tubing is used on these systems.

(Example: When a 25-ft accessory tubing package is

used on a 38ED048 system, the smaller suction line results in a 3% capacity reduction.)

Length of interconnecting tubing may necessitate

refrigerant charge adjustment. Follow special re quirements described in Start-Up, Refrigerant Charging, page 6. Do not use less than 10 ft of inter connecting tubing. On Carrier accessory tubing packages, do not cut 5/16-in. or 1 /4-in. liquid line or 7/8-in. suction line. These tubing packages have swaged ends that if cut, will not fit into refrigerant line fittings. Bend or coil excess tubing to fit.

Do not use damaged, undersized or contaminated

tubing. Always evacuate or purge evaporator coil and tubing system. When purging, use field-supplied refrigerant, not unit holding charge refrigerant.

When making tubing connections, be sure to pro

vide clearance at unit for electrical connections.

REPLACE THE ACCURATER™ REFRIG

ERANT CONTROL PISTON IN THE INDOOR COIL, if required, before connecting refrigerant lines. See Carrier Cooling System Capacity Optimi zation, page 1.

CONNECT REFRIGERANT LINES to fittings on condensing unit suction and liquid service valves (Fig. 1). Unit Compatible Fittings permit mechan ical (quick connect) or sweat connections.

Models 38ED036,042,048,060 — When using 1-1/8 in. field-supplied suction line, use field-supplied 3 / 4-in. by 1 -1 / 8 in. suction valve connection adapter (28VQ900011). Sweat connect refrigerant suction line to 1-1/8 in. end of adapter. Be sure to provide a heat sink at the service valve to prevent damage

during sweating operation. Connect 3/4-in. end of

adapter to unit suction line Compatible Fitting.

Connect liquid refrigerant line to unit. When a 7/8-in. field-supplied suction line is used, provide a field-supplied 3/4-in. to 7/8-in. suction line adapter. (Not necessary if 38LS accessory tubing is used.)

Mechanical Connection — (Mate one set of eonnec-

tions at a time.)

1. Loosen nut on Compatible Fitting one turn. Do not remove.

2. Remove plug and be sure O-ring is in the groove inside the Compatible Fitting.

3. Cut tubing to correct length, deburr and size as necessary.

4. Insert tube into Compatible Fitting until it bottoms. Tighten nut until it bottoms on back coupling flange. Keep tube bottomed in Com patible Fitting while tightening nut.

Sweat Connection — (Use refrigerant grade tubing.)

1. Remove locking nut, rubber O-ring and Schrader core and cap from valve service port.

2. Cut tubing to correct length, deburr and size as necessary.

3. Insert tube in Compatible Fitting until it bottoms. Wrap top and bottom of service valves in wet cloth to prevent damage by heat. Solder with lowtemperature (430 F) silver alloy solder.

4. Replace Schrader core and cap.

5. Evacuate or purge system using field-supplied refrigerant.

Step 3 — Install Solenoid on Indoor Coil Liquid Line Fitting — Before making liquid line connec

tions, install factory-supplied solenoid on indoor coil liquid line fitting. It is not necessary to flare the system liquid line if an accessory flare-to-Compatible

Fitting coupler is used (refer to indoor coil installa

tion instructions. Accessory Flare to Compatible

Coupler).

See Fig. 4 and install as follows:

1. Remove coil liquid line cap and discard.

2. Attach field-supplied flare fittings to solenoid valve straight 3/8-in. stubs.

Fig. 4 — Solenoid Installation

Connect solenoid to tube assembly, making sure

3. solenoid flow arrows point towards indoor coil. Mount solenoid in any position except valve body at top and electric coil at bottom (see Fig. 4).

Tighten flare nuts.

4. Wire coil into system control circuit as shown in

Fig. 5.

Step 4 — Make Electrical Connections — Be

sure field wiring complies with local and national fire, safety and electrical codes, and that voltage to unit is within limits shown in Table 4. Contact local power company for correction of improper line voltage.

Table 3 — Accessories

PART NO.

HH01AD040 HH93AZ040

HH51AR001 HH07AT170

HH07AT174 HH93AZ176 HH01AD042 HH93AZ042 38VH90000106 38GS900102

HT01AW230

09WQ036.060 38GS900321

28VQ9000112

TUBING

PACKAGES

38LS934151 38LS934201 38LS934251 38LS934301 38LS934351 38LS934401 38LS934501

38LS978151 38LS978201 38LS978251 38LS978301 38LS978351 38LS978401 38LS978501

*For maximum capacities, use suction line sizes recommended in

Table 1 Use of accessory tubing packages smaller than recom mended may result in slight capacity loss (see Note 2)

fSuction line is insulated and has a 90 degree bend at one end

Low-Voltage Control — Honeywell Deluxe Thermostat Thermostat Subbase

Comfort Control Center (Use with HH01AD040) Low-Voltage Control — Honeywell Thermostat Thermostat Subbase (with Automatic Changeover)

Low-Voltage Control — Honeywell Thermostat Thermostat Subbase Thermocharger™ Replacement Unit Module (Six 38VH900001) Indoor Fan Relay (Six HN61KJ210) Low-Voltage Transformer (60va) — Available thru Carrier Service Parts Refrigerant-to-water heat exchanger for chilled water systems

Liquid Line Filter Drier (Six 38GS900332) Twelve % X IVs-in suction connection adapters

Liquid

Length

(ft)

15 20 3/8 25 30 3/s 35 3/8 40 50 3/s

15 3/8 20 3/8 25 30 35 3/8 40 3/8 50 3/8

(in.)

ys 3/8 3/4 3/4 3/4

3/s

3/8

3/s 3/s

DESCRIPTION

TUBING*

Suctiont

Tube End

OD (in.)

3/8 3/8 3/8 3/8 ya ya

3/8 3/8 ya 3/8 3/8 3/8 3/8 3/4 3/4 3/8

3/s

(in.)

3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4

3/8 3/4 3/4 3/8 3/8 3/4 3/4

3/8 3/8

NOTES;

Do not cut ys-in OD liquid line to a length shorter than 10 feet

Do not cut ya-in OD suction lines Field-supplied IVs-in suction line is recommended on 38ED 036,042,048 and 060 If accessory tubing package is used, a capacity reduction can result

Tube End

OD (in.)

Evap Cond

3/4

3/4 3/4

3/4 3^ 3/4 3/4

MODEL 38ED

All

042,048,060

MODEL

38ED

3/4 3/4

3/4

036,042,

048,060

(See Note 2)

1.,

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