Carrier 38EB User Manual
Number One
AirCoxIitbning
l\Mer
Installation, Start-Up '
Division of
Carrier Corporatio
e
Carrier Parkway • Syracuse NY 13221
and Service Instructions
Air-Cooled Condensing Units
INDEX
SAFETY CONSIDERATIONS......................
INSTALLATION
Step 1 — Check Equipment and
Jobsite..............................................................I
• 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 — Make Electrical
Connections....................................................5
• 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
SERVICE............................................................. 8-10
MAINTENANCE..................................................11,12
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
tions. Have fire extinguisher available for all brazing
operations.
...........................................
_______
...........................................................
SAFETY CONSIDERATIONS
Page
.. 1
. 1-6
2
6-8
WAR-NiNG: Before perfosrmisg service or
majnteiiatice орегайоиз or system, tarn off
vaaia power to isdoor tmit tsml outdoor
■ask. Тош off accessory beater power switch is
appiicaMe, E^ecfircal sihock, could cause pers<mal injury.
Table 1 — Physical Data (Refer to Fig. 1)
MODEL38EB
OPER WT(lb)
DIMENSIONS (ft-in.)
Diameter A
Height B
CONNECTIONS (in.)
Suction (ODF)
Liquid (ODF)
REFRIG LINES
Suction (in. ODF)
Liquid (in ODF)
*Fora1-1/8in suction line on 38EB048,060, a 3/4-in x 1-1/8 in suction
valve connection adapter is available as an accessory See Table 3
015 018
024
030
116
1-9-3/4
Recommended Field-Supplied Sizes
5/8 i 3/4 i 7/8 1 1-1/8
130
2-2-3/8 ) 2-8
5/8
137 165 181
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.
036
2-2-3/8 1 2-8 1 3-2
3/
8
3/8
042
048 060
212 230.
2-5-1/4
3/4*
© Carrier Corporation 1982
Form 38EB-3SI
4'-0" OVERHEAD SPACE REQUIRED
FOR SERVICE AND AIRFLOW
LIQUID VALVE SERVICE PORT
CONDENSER AIRFLOW
KW r-6''AIRFL0W
■•••••■ AND SERVICE
CLEARANCE
SUCTION VALVE SERVICE PORT
rectly 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
orator requires field replacement of piston. Refer to
Table 2. Replace piston, if required, before connec
ting refrigerant lines. Piston replacement instruc
tions are included 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 or
less 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
38EB
015 TWl 46 i
018 ’ . 4
024
030
036
042
048
060
Factory-installed piston. Obtain replacement pistons thru
local Carrier distributor.
ACCURATER™ PISTON NO.
Evap Size (Coil or Fan Coil)
ÒTFI”M4TCÌ301
> I j_V'
52
57
036
TXV
65
6? 70
048 060
042
— — —
— —
TXV
TXV
76
,...78...
_
62
—
p»
TXV
i 82
^CONCRETE PAD SHOULD WEIGH 1^ TO 2 TIMES WEIGHT OF UNIT
Certified dimension drawings available upon 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 AccuRater piston size required for condenser/
evaporator system being installed. Pistons are cor-
njmm
Fig. 2 — AccuRater (Bypass Type)
Components
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.
If or
1$ osigd wism saaldog
If 1-1/8 in. tubing is used (38EB048,060), braze
it to the accessory 1 -1 / 8 x 3/4-in. suction connection
adapter (Carrier Part No. 28VQ900011) or to cor
rectly sized field-supplied adapter, then make Com
patible Fitting connections.
WARNING: iX> NOT BURY UNESETS- If
fdfigerans
E b. veitkaS Ui« to the vah;« irastxsciioiis m
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 38EB048 and 060 sys^
terns 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 38EB048 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
condensing unit suction and liquid service valves
(Fig. 1). Unit Compatible Fittings permit mechanical
(quick connect) or sweat connections.
Models 38EB048,060 — 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 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 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 Compat
ible Fitting while tightening nut.
SweatT/onnection — (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.
Table 3 — Accessories
PART NO.
38CQ900141
HH01AD040
HH93AZ040
HH07AT170
&
HH07AT174
HH93AZ176
HH01AD042
HH93AZ042
HH01YA192
HH93YZ194
38GS900102
38GS900212
HT32BH246
38UE900201
HC95DE088
HN61HB513
HC95DD121
HN61HB515
HC95DE066
HN61HB513
HC95DE088
HN61HB515
HC95DE088
HN61HB506
38EB660002
09WQ036,060
38GS900321
28VQ900011 Twelve 3/4- x 1-1/8 in Connection Adapters
PACKAGES
38LS958151 15
38LS958201 20
. 38LS958251 25 3/8
38LS958301
38LS958351
38LS958401
38LS958501
38LS934151 15
38LS934201
38LS934251
38LS934301
38LS934351
38LS934401
38LS934501
38LS978151
38LS978201
38LS978251 25
38LS978301 30
38LS978351
38LS978401 40
38LS978501
Solid-State Time Guard
(Six 38CQ900152)
Low-Voltage Control Honeywell Deluxe Thermostat
Thermostat Subbase
Low-Voltage Control
Honeywell Thermostat
Thermostat Subbase
Low-Voltage Control Honeywell Thermostat
Thermostat Subbase
Low-Voltage Control Grayson Thermostat
Thermostat Subbase
Indoor Fan Relay (Six HN61KJ210)
Low-Voltage Transformer (Six 38GS900091)
Crankcase Heater*
Crankcase Heater Relay (Six 38UE900212)*
Start Capacitor*
Relay*
Start Capacitor*
Relay*
Start Capacitor*
Relay*
Start Capacitor*
Relay*
Start Capacitor*
Relay*
Wire Bundle for Start Capacitors and Relays*
Refrigerant-to-Water Heat Exchanger for Chilled Water Systems
Liquid Line Filter Drier
Length
(ft)
30
35
40
50
20
25
30
35
40
50
15
20
35
50
OD
(in.)
3/8 3/8
3/8 3/8
5/16
5/16
5/16
1/4
3/8
3/8
3/8
3/8
3/8
3/8 3/8
3/8
3/8
3/8 3/8
3/8
3/8 3/8
3/8 3/8
3/8 3/8
3/8 3/8
DESCRIPTION
Liquid
Tube End
OD (in.)
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
TUBlNGt
Suctionj;
OD
(in.)
5/8
5/8
5/8
5/8
5/8
5/8
5/8
3/4 3/4 3/4
3/4
3/4 3/4 3/4
3/4
3/4
3/4 3/4
3/4
7/8
7/8
7/8
7/8
7/8
7/8
7/8
Tube End
OD (in.)
Evap
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
3/4
3/4
3/4 3/4
3/4
3/4
3/4 3/4
3/4 3/4
Cond
MODEL
38EB
All
015300, 018300
024300, 030300
036310
042360
048310
All
048, 060
38EB
5/8
5/8
5/8
5/8
5/8
5/8
5/8
3/4 030, 036
3/4
3/4
3/4
3/4
3/4
015, 018, 024
r:'
*Available thru Carrier Service Parts
tFor 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
**For 5/8-in evaporator connection, cut off 3/4-in end
NOTES
1 Do not cut 3/8-in OD liquid line toa length shorterthan 10feet
Do not cut 5/16-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
38EB048 and 060 If accessory tubing package is used, a
capacity reduction can result
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