Carrier 38EH User Manual

38EH

HEATING & COOLING

Installation and Start-Up Instructions

SAFETY CONSIDERATIONS

Installing and servicing air conditioning equipment
can be hazardous due to system pressure and electrical
components. Only trained and qualified service personnel
should install or service air conditioning equipment.

Untrained personnel can perform basic maintenance,
such as cleaning and replacing filters. All other opera
tions should be performed by trained service personnel.
When working on air conditioning equipment, observe
precautions in literature and on tags and labels attached
to unit.

Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for brazing operations. Have
fire extinguisher available. Read these instructions
thoroughly. Consult local building codes and NEC
(National Electrical Code) for special installation
requirements.

A WARNING

Before installing or servicing system, always turn
off main power to system. There may be more than
one disconnect switch. Turn off accessory heater
power if applicable. Electrical shock can cause
personal injury

Step 1 — Install on a Solid, Level Mounting
Pad — It is recommended that unit be attached to pad

using tiedown bolts. Fasten unit to pad using holes pro
vided in unit base. See Fig. I

When installing, allow sufficient space for airflow

clearance, wiring, refrigerant piping and service. Main
tain a minimum of 4 ft clearance from obstructions above
and 18 in around unit (I2in. on valve side). Main
tain a distance of 24 in. between condensing units.

Position so water or ice from roof or eaves cannot

fall directly on unit.

Air-Cooled Condensing Units

4'0" OVERHEAD SPACE REQUIRED

CONTROL
BOX

I DIAM
HOLE FOR^

CONTROL
WIRING

LIQUID

VALVE '
SERVICE
PORT
(HIDDEN)

SUCTION VALVE
SERVICE PORT

' AIRFLOW

FOR SERVICE AND AIRFLOW

I-6 AIRFLOW AND SERVICE
CLEARANCE AROUND UNIT

-I2" ON VALVE SIDE

LOUVERED
CASING

Step 2 — Replace Indoor AccuRater™ Piston
if Required — Check indoor coil piston to see if it

matches the required piston listed in Table 2. If it does
not match, replace indoor coil piston with piston shipped
with this outdoor unit (located in plastic bag taped to
valves). See Fig. 2.

Step 3 — Make Piping Connections — Outdoor

units may be connected to indoor sections using Carrier
accessory tubing package or field-supplied tubing of
refrigerant grade, correct size (see Table I) and condition.
For tubing requirements beyond 50 ft, obtain informa
tion from Carrier distributor.

OUTDOOR UNITS CONNECTED TO CARRIER­APPROVED INDOOR UNITS — Outdoor units con
tain correct system refrigerant charge for operation with

indoor unit of the same size when connected by 25 ft of
field-supplied or Carrier accessory tubing. Check refrig
erant charge for maximum efficiency (see Refrigerant
Charging)

Bookh |4 PC101 Catalog No 533-813 PrintedinUSA Form38EH-5SI Pg 1 1-86 Replaces: 38EH-3SI
Tab J3a 2a

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

For replacement items use Carrier Specified Parts

Certified dimension drawings available upon request

Fig. 1 — Dimensions, Connections and

Mounting Pad (Refer to Table 1)

Table 1

MODEL 38EH
OPER WT (lb)* 116 131
REFRIGERANT

Control

CONDFAN

Air Discharge
Air Qty (dm)

Motor Rpm (60 Hz)
Motor Hp

_________

CONOCOIL(fins/in.)

Tube Diam
Rows

Face Area (sq ft)

DIMENSIONS (ft-ln.)

Diameter A
Height

___________

CONN (in. ODF)

Suction
Liquid

________

REFRIG LINES (In. ODF)

Suction
Liquid

'Weight increases slightly with addition of any accessories
t38EH048,060 require a I'/a-ln suction line for optimum performance. A

%- X I'/a-in connection adapter accessory (Carrier Part No. 28AU900061)

is available If a %-in accessory tubing package is used, expect a 3%

capacity loss

Physical Data (Refer to Fig. 1)

015 018

B

Compatible Fitting (Suction and Liquid)

024

030 036 042

148

171 177

AccuRater™ (Installed in i.D. Coil)

Propeller Type, Direct Drive, 1-Speed
1850 3100 1 4000

830 I 850

V.0 I

12.37 17.11

1-9%

Vertical

________

'k in , E-coil

1 I 2

22

'/a I '/; I %

16

2-7

178

2-5'/4

% I 14

Table 2 — AccuRater™ Chart

ACCURATER PISTON NO.

COND UNIT

38EH

(1- and 3-Ph)

015 46 46
018
024
030
036
042
048
060

014/

015

—

— — —

— — — —

—

—

— — — —

Indoor Coil Size (28—)

and Indoor Fan Coil Size (40—)

024

018

49

—

TXV

49
61

030

—

TXV

61
70

036 042

— —

—

TXV

70
76 76

_

__

— —

—

— —

—

—

—

—

TXV

82

—

—

048

— —

—

— —

TXV

82 TXV
80 80

—

FLARE NUT

048 060

210

236

I'/at

060/

062

—

—

98

CONNECT REFRIGERANT LINES to fittings on out
door unit suction and liquid service valves (Fig. 1). Unit
Compatible Fittings permit mechanical (quick-connect)
or sweat connections.

Compatible Fitting on outdoor section has aluminum
plugs located beneath compatible nut — one plug each
on suction and liquid valves. Plugs keep contaminants
out of Compatible Fitting.

A CAUTION

When removing compatible nut, be careful pressure
build-up does not cause aluminum plug(s) to blow
and cause personal injury. After tubing is hooked up,
discard plug(s).

Models 38EH048,060 — When using 1-1/8 in. field­supplied refrigerant suction line, sweat-connect suction
line to 1-1/8 in. end of required connection 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 connections

at a time.

1. Remove nut on Compatible Fitting.

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 neces
sary. Slide nut onto tube

4. Insert tube into Compatible Fitting until it bottoms.

Tighten nut until it bottoms on shoulder of fitting

or valve. Keep tube bottomed in Compatible Fitting

while tightening nut.
NOTE: If using Carrier accessory tubing package,

make connections within 2 minutes to avoid refrig

erant loss.

5. If using field-supplied tubing evacuate or purge system
using field-supplied refrigerant.

FLARE
CONNECTION

Fig. 2 — AccuRater™ (Bypass Type) Components

A CAUTION

DO NOT BURY MORE THAN 3 FT OF REFRIG

ERANT TUBING IN GROUND. If any section of
tubing is buried, there must be a 6-in. vertical rise
to the valve connections on the outdoor unit. If more
than the recommended length is buried, refrigerant
may migrate to cooler buried section during extended
periods of unit shutdown, causing refrigerant slug
ging and possibly compressor damage at start-up.

A CAUTION

If undersized, damaged or elliptically-shaped tubing
is used when making Compatible Fitting, leaks may
result.

Sweat Connection— Use refrigerant grade tubing.

Remove locking nut, plug, rubber O-ring and Schrader

1.

core and cap from valve service port.

Cut tubing to correct length, deburr and size as

2.

necessary.
Insert tube in Compatible Fitting until it bottoms.

3.
NOTE: Wrap top and bottom of service valves in wet

cloth to prevent damage by heat. Solder with low­temperature (430 F) silver alloy solder.

Replace Schrader core and cap.

4.
Evacuate or purge system using field-supplied

5.
refrigerant.