Carrier 38EN User Manual

38EN

HEATING A 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 instruc tions thoroughly. Consult local building codes and National Electrical Code (NEC) 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.

Air-Cooled Condensing Units

Step 1 — Check Equipment and Jobsite —

Install on a solid, level mounting pad. It is not recom mended that unit be attached to pad using tiedown bolts. Fasten unit to pad using holes provided in unit mounting

feet. See Fig. 1.

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. on 3 sides of unit (12 in. on fourth side). Main tain a distance of 24 in. between condensing units. Posi tion so water or ice from roof or eaves cannot fall directly on unit.

Step 2 — Replace Indoor AccuRater™ Piston, if required.

REPLACE ACCURATER REFRIGERANT CON TROL PISTON in the indoor coil, if required, before connecting refrigerant lines. Refer to Table 2 for proper piston size.

Step 3 — Make Piping Connections — Outdoor units may be connected to indoor sections using Carrier accessory tubing package (refer to Service Data) or field-supplied tubing of refrigerant grade, correct size (see Table 1) and condition. For tubing requirements beyond 50 ft, obtain information from your local distributor.

Outdoor Units Connected to Carrier-Approved Indoor Units — Outdoor units contain 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 refrigerant charge for maximum efficiency (see Refrigerant Charging, page 4 and Service Data).

Certified dimension drawings avaiiabie upon request

Fig. 1 — Dimensions, Connections and

Mounting Pad (Refer to Table 1)

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

Book И |4 PC101 Catalog No 563-825 PrintedinUSA Form38EN-3SI Pg 1 485 12-84 Replaces: 38EN-2SI

Tab |3a|2a

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^ 38EN

HEATING A COOLING

Air-Cooled Condensing Units

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

MODEL 38EN OPER WT (lb)* REFRIGERANT

Control

COND FAN

Air Discharge Air Qty (cfm) Motor Rpm (60 Hz)

COND COIL (fins/in.)

Tube Diam Rows Face Area (sq ft)

Outer Row Inner Row

DIMENSIONS (ft-in.)

Diameter A Height B

CONN (in. ODF)

Suction Liquid

REFRIG LINES (in. ODF)

Suction Liquid

*Add 10 lbs for louvered casing (If so equipped) Weight Increases slightly

with addition of any accessories

t38EN048,060 require a I'/s-ln suction line for optimum performance. A

%- X 1'/8-in connection adapter accessory (Carrier Part No. 28AU900061) is available If a %-in accessory tubing package is used, expect a 3% capacity loss

015 018

94 111

024 030 036

142

111

AccuRater'“ (Installed In I.D. Coil)

Propelle

ir Type, Direct Drive

1950 1650

% in -

8 15

1- 5'/2

2- 1

Compatible F

Vertical

2800 1 4800

12 37

1-9’/2

tting (Suction and Liquid)

% 1 % 1 '/e 1 1’/at

042 048

146 182 200

1100

'/2

in , E-coil

17 11

2-7

060

228

17.11

2-5'/4

RETAINER

FLARE CONNECTION

Fig. 2 — AccuRater (Bypass Type)

Components

CUT HERE-J

FLARE NUT

,0-RING

A CAUTION

DO NOT BURY MORE THAN 3 FT OF RE FRIGERANT 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 slugging and possibly compressor damage at start-up.

Table 2 — AccuRater™ Selection Chart

COND UNIT

38EN

(1- and 3-Ph)

015-0 018-0 024-0 030-0 030-2 036-0 042-0 048-0 060-0 060-1

Factory-installed piston Obtain replacement pistons through local Carrier distributor

018 024

015

■ 52 52 TXV — — — — —

— — 57

—

— — — — — — 78 — —

Fig. 3 — Repair of Mechanicai Connection

CONNECT REFRIGERANT LINES to fittings on outdoor unit suction and liquid service valves (Fig. 1). Unit Compatible Fittings permit mechanical (quickconnect) or sweat connections.

Models 38EN048,060 — 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 fieldsupplied 3/4-in. to 7/8-in. suction line adapter (not necessary if 38LS accessory tubing is used).

ACCURATER'“ PISTON NO.

Evap Size (Coil or Fan Coil)

036 042 048 060

030

—

TXV

—

631

— —

— — —

TXV

— — — —

TXV

70 TXV — —

060

— — — — — —

78 TXV

■

—

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

Bookll |4 PC101 Catalog No 563-825 PrIntedInUSA Form38EN-3SI Pg 2 12-84 Replaces: 38EN-2SI

+ 4 hidden pages