Carrier 38HDF018-036 User Manual download pdf

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

Catalog No. 02-38HD0001-SI Printed in U.S.A. Form 38HD-4SI Pg 1 1-06 Replaces: 38HDC-3SI

Book 1 4

Tab 3 e 2 f

Installation, Start-Up and

Service Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS ...................... 1

INSTALLATION ................................ 1-10

Step 1 — Complete Pre-Installation Checks ......1

• UNPACK UNIT

• INSPECT SHIPMENT

• CONSIDER SYSTEM REQUIREMENTS

• MATCHING THE CONDENSING UNIT TO AN

INDOOR UNIT

Step 2 — Rig and Mount Unit.....................3

• MOUNTING ON GROUND

• MOUNTING ON ROOF

• RIGGING

Step 3 — Complete Refrigerant Piping

Connections ................................... 3

• CHECK ACCURATER CONTROL

• FILTER DRIER

• MAKE PIPING SWEAT CONNECTORS

• PROVIDE SAFETY RELIEF

Step 4 — Make Electrical Connections ........... 6

• CONTROL CIRCUIT WIRING

• POWER WIRING

• CONNECTIONS TO DUCT-FREE FAN COIL UNITS

START-UP ....................................... 11

SERVICE ..................................... 11-14

MAINTENANCE .................................14

TROUBLESHOOTING..........................14,15

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 operations should be

performed by trained service personnel. When working on air

conditioning equipment, observe safety precautions in litera-

ture, 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 the National Electrical Code

(NEC) for special installation requirements.

INSTALLATION

Step 1 — Complete Pre-Installation Checks

UNPACK UNIT (See Fig. 1) — Move the unit to final loca-

tion. Remove unit from carton, being careful not to damage

service valves and grilles.

INSPECT SHIPMENT — File a claim with the shipping

company if shipment is damaged or incomplete. Check unit

nameplate to ensure unit matches job requirements.

CONSIDER SYSTEM REQUIREMENTS — Consult local

building codes and NEC for special installation requirements.

Allow sufficient space for airflow clearance, wiring, refrig-

erant piping, and servicing unit. See Fig. 2.

Locate unit so that condenser airflow is unrestricted on both

sides. Refer to Fig. 2.

Unit may be mounted on a level pad directly on base legs or

mounted on raised pads at support points. See Fig. 2 for center

of gravity.

MATCHING THE CONDENSING UNIT TO AN

INDOOR UNIT — The 38HDF,HDR units can be matched to

a corresponding indoor unit. The 38HDF018-036 units can be

matched with an in-ceiling cassette or high wall indoor unit.

The 38HDR unit can be matched with under-ceiling and resi-

dential fan coils. Refer to separate indoor unit literature for

more information.

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. Elec-

trical shock can cause serious personal injury.

Puron® (R-410A) refrigerant systems operate at higher

pressures than standard R-22 systems. Do not use R-22 ser-

vice equipment or components on Puron refrigerant equip-

ment. If service equipment is not rated for Puron refrigerant,

equipment damage or personal injury may result.

38HDF018-036

Duct Free Condensing Units

38HDR018-060

Ducted Condensing Units

Fig. 1 — 38HDF,HDR Unit

1 2 3 4 5 6 ... 15 16

Summary of Contents

Page 1 - Service Instructions

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

Page 2

10LEGENDNOTES:1. Compressor and fan motors are thermally protected.2. Wire in accordance with National Electrical Code (NEC) and local codes. Replacea

Page 3 - Step 2 — Rig and Mount Unit

11START-UPPreliminary Checks1. Check that all internal wiring connections are tight andthat all barriers, covers, and panels are in place.2. Field ele

Page 4

12To troubleshoot:1. Apply voltmeter across crankcase heater leads to see ifheater voltage is on. Do not touch heater. Carefully feelarea around crank

Page 5

13Table 4 — Pressure vs. Temperature Chart — Puron® Refrigerant (R-410A)Subcooling Method — For 38HDR units only, the sub-cooling method is used to ch

Page 6 - 38HDR UNITS

14Table 5 — Subcooling Charging TableCompressor Lockout Switch — The 38HDR unitsare provided with a compressor lockout protective device. Ifthe compre

Page 7

15Fig. 9 — Troubleshooting the Cooling Cycle

Page 8

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

Page 9 - 38HDF OPERATION SEQUENCE

2(FIELD PROVIDED AND INSTALLED)Fig. 2 — 38HDF,HDR Unit DimensionsNOTE: Dimensions shown in feet-inches. Dimensions in ( ) are millimeters.UNIT MODELSC

Page 10 - 38HDR OPERATION SEQUENCE

3Step 2 — Rig and Mount UnitMOUNTING ON GROUND — Mount unit on a solid, levelconcrete pad. Position unit so water or ice from roof does notfall direct

Page 11

4Only use factory specified liquid-line filter driers with ratedworking pressures less than 600 psig.NOTE: Do not install a suction-line filter drier

Page 12 - Refrigerant Charging

5Table 1B — 38HDR018-060 Physical DataLEGEND *Unit shipped with full factory charge. See ARI (Air Conditioningand Refrigeration Institute) capacity ta

Page 13

6Step 4 — Make Electrical ConnectionsCONTROL CIRCUIT WIRING — Control voltage is 24 v(40 va minimum). See Fig. 5 and unit label diagram for field-supp

Page 14 - TROUBLESHOOTING

7Table 2 — 38HDF Electrical DataLEGEND*Permissible limits of the voltage range at which unit will operatesatisfactorily.NOTES:1. Control circuit is 24

Page 15

8Table 3 — 38HDR Electrical DataLEGEND*Permissible limits of the voltage range at which unit will operatesatisfactorily.NOTES:1. Control circuit is 24

Page 16 - Tab 3 e 2 f

9LEGENDNOTES:1. Compressor and fan motors are thermally protected.2. Wire in accordance with National Electrical Code (NEC) and local codes. Replacean

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Carrier 38HDF018-036 User Manual

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