Carrier 38EC User Manual

Number One
Air Conditbninq
Maker

Installation, Start-Up ^ ^ 3

Division of

and Service Instructions

Carrier Corporation
Carrier Parkway • Syracuse

SAFETY CONSIDERATIONS
INSTALLATION

Step 1 — Check Equipment and

Jobsite.................................................................1

• UNPACK UNIT

• INSPECT EQUIPMENT

• COMPLETE OR CONSIDER

Step 2 — Make Piping Connections .... 2

• REPLACE THE ACCURATER™

• CONNECT REFRIGERANT LINES

Step 3 — Make Electrical

Connections........................................................5

• INSTALL A BRANCH CIRCUIT

• ROUTE LINE POWER LEADS INTO

• CONNECT GROUND LEAD AND

• CONNECT CONTROL POWER

START-UP

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

MAINTENANCE

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 mainten
ance functions of cleaning coils and filters and re

placing filters. All other operations should be
performed 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.

Follow all safety codes. Wear safety glasses and

work gloves. Use quenching cloth for brazing opera-

f N Y 13221

Air-Cooled Condensing Units

INDEX

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

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

SYSTEM REQUIREMENTS

REFRIGERANT CONTROL
PISTON IN THE INDOOR
COIL IF REQUIRED

DISCONNECT PER NEC

UNIT

POWER WIRING

WIRING

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

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

SAFETY CONSIDERATIONS

Page

1

1-5

6-8

10-12

tions. Have fire extinguisher available for all brazing

operations.

WARJ^iKG; Before performitsg $ervice or
maiatesjaBce operatjojjs vam off

nsBiirt po’»er swiich. to indoor »nfi and outdoor

unit. Turn, off accessory heater poTser switch if
applicable- Electrical siioolc could cause per­sortal irgnry.

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

MODEL 38EC
OPER WT (lb)
DIMENSlbNS (ft-in.)

Diameter A

Height B

CONNECTIONS (in.)

Suction (DDF)

Liquid (DDF)

REFRIG LINES

Suction (in DDF)

Liquid (in DDF)

*Fora1-1/8in suction line on 38EC048,060, a 3/4-in x 1-1/8 in suction

valve connection adapter is available as an accessory See Table 3

018 024

116 130 137 165

2-2-3/8 1 2-8

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.
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.

030 036 042 048* 060*

212 230

18|

1-9-3/4

5/8 3/4*

Recommended Field-Supplied Sizes

5/8 1 3/4 I 7/8 I 1-1/8

2-5-1/4

2-2-3/8 1 2-8 1 3-2

3/8

3/S

© Carrier Corporation 1982

Form 38EC-2SI

4-0 OVERHEAD SPACE REQUIRED
FOR SERVICE AND AIRFLOW

LIQUID VALVE SERVICE PORT

CONDENSER AIRFLOW

liDIAM HOLE

FOR POWER
WIRING

r-6 AIRFLOW
AND SERVICE

CLEARANCE

SUCTION VALVE SERVICE PORT

orator i^^if^field replacement of piston. Refer to
Table 2. Replace piston, if required, before connect
ing refrigerant lines. Piston replacement instructions
are ineluded in evaporator installation book. After
system installation is complete, use Charging Chart
to check and/or adjust refrigerant charge.

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
of field-supplied or Carrier accessory tubing.
Check refrigerant charge for maximum efficiency
(see Refrigerant Charging, page 6).

Table 2 — Optimization Chart

(Outdoor air design temperature. db-F.

100 F and below)

COND

UNIT

38EC

018
024
030
036
042
048
060

014 018

—

— —
—
— —

— —
— — —

—

Factory-installed piston Obtain replacement pistons thru
local Carrier distributor

ACCURATER™ piSTON NO.

Evap Size (Coil or Fan Coil)

024 030

46

—

—

TXV

52
SS

—

— —
—

—

57
63

— — ■■■■
— —

036

—

TXV

65

67

- -

042

048 060

— —

— — —

_

TXV

70

TXV

76 78

—

S3 82

— ■ ; 64

—

—

TXV

*CONCRETE PAD SHOULD WEIGH I5 TO 2 TIMES WEIGHT OF UNIT

Certified dimension drawings available on request

Fig. 1 — Dimensions. Connections and

Mounting Pad (Refer to Table 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 AecuRater piston size required for eondenser/
evaporator system being installed. Pistons are cor­reetly sized for an evaporator of the same capacity as
the condensing unit, so piston change is not neces
sary. Mix-matching of condensing unit with evap-

Fig. 2 — AccuRater (Bypass Type)

Components

■Step 2 — Make Piping Connections — Con

densing units may be conneeted 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.

WARNING if

ùt

If 1-1/8 in. tubing is used (38EC048,060), braze
it to theaecessory 1-1 / 8 x 3/4-in. suction eonnection
adapter (Carrier Part No. 28VQ900011) or to eor-

rectly sized field-supplied adapter, then make Com
patible Fitting connections.

Table 3 — Accessories

PART NO

HH01AD040
HH93AZ040

HH07AT170

Low-Voltage Control Honeywell Deluxe Thermostat
Thermostat Subbase

Low-Voltage Control

DESCRIPTION

&

HH07AT174
HH93AZ176

HH01AD042
HH93AZ042

HH01YA192
HH93YZ194

38GS900102 Indoor Fan Relay (Six HN61KJ210)
38GS900212
28VQ900011
09WQ036.060 Refrigerant-to-Water Heat Exchanger for Chilled Water Systems All

TUBING

PACKAGES

38LS958151
38LS958201
38LS958251
38LS958301
38LS958351
38LS958401
38LS958501

38LS934151
38LS934201
38LS934251
38LS934301
38LS934351 35 3/8
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)
tSuction line is insulated and has a 90 degree bend at one end
JFor 5/8-in evaporator connection, cut off 3/4-in end

Length

Honeywell Thermostat

Thermostat Subbase
Low-Voltage Control Honeywell Thermostat

Thermostat Subbase

Low-Voltage Control Grayson Thermostat

Thermostat Subbase

Low-Voltage Transformer (Six 38GS900091)

Twelve 3/4- x 1-1/8 in Connection Adapters

TUBING

Liquid

(ft)

15 3/8 3/8
20 3/8 3/8
25 3/8
30 5/16
35 5/16
40 5/16
50

15 3/8
20 3/8
25 3/8
30

40 3/8 3/8 3/4 3/4 3/4
50 3/8

15 3/8 3/8
20
25 3/8

30 3/8

35 3/8

40 3/8

50 3/8

OD

(in.)

1/4

3/8 3/8 3/4 3/4 3/4 030, 036

3/8 3/8 7/8 3/4

Tube End

OD (in.)

3/8
3/8 5/8
3/8 5/8
3/8 5/8 3/4t
3/8 5/8

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

3/8

3/8

3/8 7/8 3/4
3/8 7/8 3/4
3/8 7/8
3/8 7/8 3/4
3/8 7/8 3/4

*

Suctionf

OD

(in )

5/8
5/8 3/4t 5/8
5/8 3/4t 5/8

3/4

3/4 3/4 3/4

3/4
7/8

NOTES
1 Do not cut 3/8-in OD liquid lines to a length shorter than 10

feet Do not cut 5/1 6-or 1/4-in liquid line Do not cut 7/8-in
OD suction lines

2 Field-supplied 1-1/8 in suction line is recommended on

38EC048 and 060 If accessory tubing package is used, a

capacity reduction can result

Tube End

OD (in.)

Evap Cond

3/4t

3/4t 5/8
3/4t 5/8

3/4t

3/4 3/4

3/4

3/4

3/4 3/4

MODEL

38EC

All

048, 060

MODEL

38EC

5/8

018, 024

5/8
5/8

3/4
3/4

3/4
3/4
3/4

3/4
3/4

■ WAHNiKO' IK> HOI Et'RY LiNESETS. if
is for exsojaSod peraaisi. dint

ing vmtn westiher. rdVigoraoi may to
the cookr boiieii ssetioo catismg
sltsggisig m A sksn ruo of kss
3 Ci of Uoesei may in pousni but ihore mmi fee
a 6 m vetiicai rise lo ifee valve cotmociiona oo
tire condeosiog sale.

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.

For maximum capacity on 38EC048 and 060 sys

tems use 1-1/8 in. suction line. 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 38EC048 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 2.

CONNECT REFRIGERANT LINES to fittings on

eondensing unit suction and liquid service valves

(Fig. 1). Unit Compatible Fittings permit mechanical

(quick connect) or sweat connections.

Model 38EC048,060 — When using 1 -1 / 8 in. field­supplied suction line, use accessory suction line
adapter. Braze refrigerant suction line to 1-1/8 in.
end of adapter. Allow adapter to cool before insert
ing into valve. Do not allow heat to reach valve as

O-ring damage may result. Connect 3/4-in. end of
adapter to unit suetion line Compatible Fitting.

Connect liquid refrigerant line to unit. If a 7/8-in.
field-supplied suction line is used, provide a field­supplied 3/ 4-in. to 7/ 8-in. suction line adapter. (Not

necessary if 38LS accessory tubing is used.)

Mechanical Connection — (Mate one set of connec

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 tubing.

4. Insert tube into Compatible Fitting until it
bottoms. Keep tube bottomed in Compatible

Fitting while tightening nut. Tighten nut until it

bottoms on shoulder of fitting or valve.

Sweat Connection or Repair — (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 tubing.

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) solder.

4. Replace Schrader core and cap.

5. Evacuate or purge system using field-supplied

refrigerant.

f

Table 4 — Electrical Data (60 Hz)

COND

UNIT

38EC

018300 41 9 1 14
024300 59 13 3
030300

036300
042310 108
048300

048310
060300

030500 60
036500 74 11 7 12

042510
048500
048510 80 163

060500 136
036600

042610
048600
048610 40 8 1
060600 49

AWG — American \A/ire Gage

FLA — Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
RLA — Rated Load Amps

‘Permissible limits of the voltage range at which the unit will

operate satisfactorily

fCopper wire sizes based on 60C Use copper or copper-clad

aluminum wire only Use latest NEC for copper-clad aluminum
conductor sizing

V/PH

208-230/1

230/1

208-230/3

460/3

OPER

VOLTAGE*
Max

Min

254

197

254 207

254

197

506 414

Compressor Fan Min Wire

LRA RLA

69 16.2 10
93

145
105

22 9
35 3

150

74

120

41 5 9

38 6 5
60 74 1 2

FLA

Size (AWG)t

1 2 12

20 2
21 7
25 7

20 8

20

94 1 2

120

20

148

20 4

102 12

BRANCH CIRCUIT

Max Wire

(ft)

31 5 14 20
32 7 12 30

46.0 10 35

10

8
8

6

14

12
10
10
10

14 106 9 14 15
14 98 9 14 15
14 87 6 14 15
12

^Required when using nonmetallic conduit

“Maximum dual element size

NOTES

1 Fan motors are 230 v, single phase
2 All units have 24-v control circuit which requires external

power source

35 7
49 9

44.8 8 60 34.5

41 0
51 3

35 3 14 20

40 7
42 9
55 0

50 4
41 2

129 2 12 20 11 3

97 9

Min Gnd

Wire Size}

10

8

10

6

12
12
10
10 35

10

12

Max Fuse or

HACR Type

Ckt Bkr Amps“

45
50 29 5

50
60

25
25
30

45

25 14 9

MCA

12 6
17 8

21.5
27 7

31 0
46 5

13 0
16 6

17 0

20 9

22 8
27 9

8 6
9 3

105