38EC
Table of contents
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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
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is for exsojaSod peraaisi. dint
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3 Ci of Uoesei may in pousni but ihore mmi fee
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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
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