Carrier 38HD User Manual

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HEATING & COOLING

Split System Condensing Units

Installation, Start-Up and Service

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

38HD

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.

INSTALLATION

Step 1 — Complete Pre-Installation Checks.

UNPACK UNIT (See Fig 1.) — Move unit to final location Remove carton from unit being careful not to. damage service valves and grilles. *

INSPECT SHIPMENT — File claim with shipping

company if shipment is damaged or incomplete. CONSIDER SYSTEM REQUIREMENTS — Consult

local building codes and National Electrical Code (NEC) for special installation requirements.

Allow sufficient space for airflow clearance, wiring,

refrigerant piping, and servicing unit. See Fig. 2 and 3.

Locate unit so that condenser airflow is unrestricted

on both sides. Refer to Eig 2 and 3.

Unit may be mounted on a level pad directly on base legs or mounted on raised pads at support points See Fig. 2 and 3 for center of gravity

Fig. 1 — Model 38HD

CHECK ACCURATER® — The correct AccuRater (bypass type) refrigerant control is required for cooling system capacity optimization. An AccuRater with fieldreplaceable piston (see Fig. 4) is supplied on evaporator. Use Optimization Chart, Table 1, to find AccuRater piston size required for condenser/evaporator system being installed. Note that one of 2 types of AccuRaters can be found on the indoor unit. Determine from Fig. 4 and Table 1 which type is in the indoor unit. Do r/otinterchange eomponents between AccuRater types. Matching of condensing unit with evaporator may require field replacement of piston. Refer to Table 1. Replace piston,// required, before connecting refrigerant lines. Piston replacement instructions are included in evaporator installation book. After system installation is complete, see Refrigerant Charging to check and/or adjust refrig erant charge

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

Book 1 4

Tab 3a 2a

PC 111 Catalog No 533-850 PrintedinUSA Form38HD-1SI Pgl 6-89 Replaces: New

For replacement items use Carrier Specified Parts.

HORIZONTAL AIR DISCHARGE

«6»

CLEARANCES FOR SERVICE AND AIRFLOW,

ALLOW 6 IN. ABOVE UNIT.

6 IN.

HIGH VOLTAGE

1-1/8' DIA.

F1^ © T ¥ f:

UNIT

38HD018 (67 1 kg) 148 lbs 38HD024 38HD030

WEIGHT

(72 6 kg) 160 lbs (77 6 kg) 171 lbs

(329) r-1"

(329)

r-1"

(15 88) %" (15 88) %" (15.88) %"

(9 53) %" (9 53) %" (9.53) %"

Fig. 2 — 38HD Dimensional Drawing, 018-030

[^¡©[Hlir ®DlS)i WOiW

NOTES

1 Dimensions in [ ] are in millimeters

2 Air Direction

3. Center of Gravity ^ 4 Footprint 018-030, 3 7 sq ft ( 34 m*)

f''

UNIT

38HD036 (108 9 kg) 240 ibs

38HD048

38HD060

WEIGHT

(110 7 kg) 244 ibs (110 7 kg) 244 ibs

A B C

(352)

1 '-1 %"

(347)

I'-iya"

(368)

1'-2'/2"

(19 05) 3/4" (19 05) %" (22 22) %"

(9 53) %" (9.53) %" (9 53) %"

1 Dimensions in [ ] are in miilimeters 2 Air Direction 3 Center of Gravity 4 Footprint 036-060, 5 3 sq ft ( 49 m^)

Fig. 3 — 38HD Dimensional Drawing, 036-060

NOTES

RETAINER

FLARE NUT

Table 1 — AccuRater Optimization Chart

FLARE CONNECTION

(Arrow on AccuRater body points in metering direction.)

(Arrow on AccuRater body points in free flow direction.)

TYPE A

Fig. 4 — AccuRater® (Bypass Type) Components

OUTDOOR

UNIT

38HD018

38HD024

38HD030

38HD036

38HD048

38HD060

INDOOR

UNIT

28RD024 40HD024

28RD030 40HD024

28RD043 40HD036

28RD049 40HD048

28RD061 40HD060

INDOOR

PISTON

61 A 70 A 73 A 86 A 88

PISTON

TYPE

A B

B B B

A B

REQUIRED

SYSTEM

CHARGE (lb)

—

5 7

11.5 97

11 2

Step 2 — Rig and Mount Unit

MOUNTING ON GROUND — Mount on a solid, level,

concrete pad Position unit so water or ice from roof

cannot drop directly onto unit. Stacking Kit 38H D900031

and -041 are available where such application is required.

See instructions provided with accessory kit. If conditions or local codes require unit be fastened to pad, tiedown bolts should be used and fastened through slots provided in unit mounting feet.

MOUNTING ON ROOF

Mount on a level platform

or frame.

RIGGING

A CAUTION

Be sure unit panels are securely in place prior to rigging.

Keep unit upright. Lift unit using sling. Use cardboard or padding under sling, and spreader bars to prevent sling damage to unit. See Fig. 5. See Fig. 2 and 3 for center of gravity reference. Install unit so that coil does not face into prevailing winds. If this cannot be done, and constant winds above 25 mph are expected, use Accessory Wind

Baffle, Part Number 38QR900041 or -051. See instruc

tions provided with accessory kit

Step 3 — Complete Refrigerant Piping Con

nections — Condensing units may be connected to

evaporator sections using field-supplied tubing of refrig erant grade, correct size and condition. See Table 2.

Do not use less than 10 ft of interconnecting tubing and do not bury more than 3 ft of line set undergrouiid. If any section 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, refrig erant may migrate to cooler buried section during extended periods of unit shutdown. This causes refrig erant slugging and possibly compressor damage at start-up.

When more than 50 ft of interconnecting tubing and more than 30 ft vertical lift is used, consider the amount of liquid lift, and compressor oil return See Part 3 of Carrier System Design Manual for design details, or contact your local Distributor

If either refrigerant tubing or indoor coil is exposed to atmospheric conditions for longer than 5 minutes, it must be evacuated to 1000 microns to eliminate contamination and moisture in the system.

Run refrigerant tubes as directly as possible, avoiding unnecessary turns and bends. Suspend refrigerant tubes so they do not damage insulation on vapor tube and do not transmit vibration to structure Also, when passing refrigerant tubes through wall, seal opening, so vibration is not transmitted to structure. Leave some slack in refrig erant tubes between structure and unit to absorb vibra tion Refer to evaporator installation instructions for additional information.

USE FILTER DRIER AND MOISTURE INDI CATOR — The filter drier is factory supplied. Moisture indicator (sight glass) is a field-supplied option and

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