Carrier 48HG014-028 Specifications download pdf

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

PC 111 Catalog No. 534-80027 Printed in U.S.A. Form 48HG-2SI Pg 1 3-01 Replaces: 48HG-1SI

Book 1 4

Ta b 1 a 6 a

Installation, Start-Up and

Service Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS

. . . . . . . . . . . . . . . . . . . . . . 1

INSTALLATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

Step 1 — Provide Unit Support

. . . . . . . . . . . . . . . . . . . 1

•ROOF CURB

• ALTERNATE UNIT SUPPORT

Step 2 — Remove Shipping Rails

. . . . . . . . . . . . . . . . 3

Step 3 — Rig and Place Unit

. . . . . . . . . . . . . . . . . . . . . 3

• POSITIONING

• ROOF MOUNT

• INSTALLATION ONTO CURB

Step 4 — Field Fabricate Ductwork

. . . . . . . . . . . . . . . 7

Step 5 — Make Unit Duct Connections

. . . . . . . . . . . 7

Step 6 — Install Flue Hood and Inlet Hood

. . . . . . . 8

Step 7 — Trap Condensate Drain

. . . . . . . . . . . . . . . . . 8

Step 8 — Install Gas Piping

. . . . . . . . . . . . . . . . . . . . . . 8

Step 9 — Make Electrical Connections

. . . . . . . . . . . 9

• FIELD POWER SUPPLY

• FIELD CONTROL WIRING

Step 10 — Install Outdoor-Air Hood

. . . . . . . . . . . . . 10

Step 11 — Make Outdoor-Air Inlet Adjustments

. . 10

Step 12 — Position Optional Power

Exhaust or Barometric Relief Damper Hood

. . . . 15

Step 13 — Install All Accessories

. . . . . . . . . . . . . . . . 15

START-UP

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-40

SERVICE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41-49

TROUBLESHOOTING

. . . . . . . . . . . . . . . . . . . . . . . . . 50-52

START-UP CHECKLIST

. . . . . . . . . . . . . . . . . . . . . . . . CL-1

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can

be hazardous due to system pressure and electrical compo-

nents. Only trained and qualified service personnel should in-

stall, repair, or service air-conditioning equipment.

Untrained personnel can perform the basic maintenance

functions of cleaning coils and filters and replacing filters. All

other operations should be performed by trained service per-

sonnel. 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 unbrazing operations. Have

fire extinguishers available for all brazing operations.

INSTALLATION

Step 1 — Provide Unit Support

ROOF CURB — Assemble or install accessory roof curb in

accordance with instructions shipped with this accessory. See

Fig. 1. Install insulation, cant strips, roofing, and counter flash-

ing as shown. Ductwork can be installed to roof curb before

unit is set in place. Curb must be level. This is necessary to

permit unit drain to function properly. Unit leveling tolerance is

in. per linear ft in any direction. Refer to Accessory Roof

Curb Installation Instructions for additional information as re-

quired. When accessory roof curb is used, unit may be installed

on class A, B, or C roof covering material.

Instructions continued on page 3.

Before performing service or maintenance operations on

unit, turn off main power switch to unit. Electrical shock

could cause personal injury.

1. Improper installation, adjustment, alteration, service,

or maintenance can cause property damage, personal

injury, or loss of life. Refer to the User’s Information

Manual provided with this unit for more details.

2. Do not store or use gasoline or other flammable

vapors and liquids in the vicinity of this or any other

appliance.

What to do if you smell gas:

1. DO NOT try to light any appliance.

2. DO NOT touch any electrical switch, or use any

phone in your building.

3. IMMEDIATELY call your gas supplier from a neigh-

bor’s phone. Follow the gas supplier’s instructions.

4. If you cannot reach your gas supplier, call the fire

department.

Disconnect gas piping from unit when pressure testing at

pressure greater than 0.5 psig. Pressures greater than

0.5 psig will cause gas valve damage resulting in hazardous

condition. If gas valve is subjected to pressure greater than

0.5 psig, it must be replaced before use. When pressure

testing field-supplied gas piping at pressures of 0.5 psig or

less, a unit connected to such piping must be isolated by

closing the manual gas valve(s).

IMPORTANT: Units have high ambient operating lim-

its. If limits are exceeded, the units will automatically

lock the compressor out of operation. Manual reset will

be required to restart the compressor.

48HG014-028

Single Package Rooftop Units

Electric Cooling/Gas Heating

1 2 3 4 5 6 ... 55 56

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.PC 1

Page 2 - Fig. 1 — Roof Curb Details

10Step 10 — Install Outdoor Air Hood — Performthe following procedure to install the outdoor-air hood:1. Remove blank panel from return end of unit (h

Page 3 - SHIPPING RAILS

11Table 2A — Electrical Data (Units Without Optional Convenience Outlet)UNIT SIZE48HGNOMINALVOLTAGE (3 Ph, 60 Hz)VOLTAGERANGECOMPRESSOROFM IFMPOWER EX

Page 4 - Fig. 3 — Rigging Details

12Table 2B — Electrical Data (Units Without Optional Convenience Outlet)UNIT SIZE48HGNOMINAL VOLTAGE (3 Ph, 60 Hz)VOLTAG E RANGECOMPRESSOROFM IFMPOWER

Page 5 - Fig. 4 — Base Unit Dimensions

13LEGEND AND NOTES FOR TABLES 2A AND 2B LEGEND*Fuse or HACR circuit breaker.NOTES:1. In compliance with NEC requirement

Page 6 - Table 1 — Physical Data

14TOP HOODSECTIONSEALSTRIPLOCATIONBOTTOMHOODSECTIONFILTERGUIDEFILTERGUIDEHOODSIDEADDSEALSTRIPADDSEALSTRIPHOODSIDEINNERFILTERTRACKADDSEALSTRIPADDSEALST

Page 7

15Step 12 — Position Optional Power Exhaust orBarometric Relief Damper Hood — The optionalpower exhaust or barometric relief dampers are shippedassem

Page 8

16START-UPUse the following information and Start-Up Checklist onpage CL-1 to check out unit PRIOR to start-up.Unit Preparation — Check that unit has

Page 9

17Table 3 — Fan Performance — 48HGD014 (Low Heat Units) — Vertical Discharge Units*LEGEND*For standard motor with standard drive, the drive range is 4

Page 10 - Space Temperature Sensor

18Table 4 — Fan Performance — 48HGF014 (High Heat Units) — Vertical Discharge Units*LEGEND*For standard motor with standard drive, the drive range is

Page 11

19Table 5 — Fan Performance — 48HGD016 (Low Heat Units) — Vertical Discharge Units*LEGEND*For standard motor with standard drive, the drive range is 6

Page 12

2Fig. 1 — Roof Curb DetailsNOTES:1. Roof curb accessory is shipped disassembled.2. Dimensions in ( ) are in millimeters.3. Direction of airflow.4.

Page 13 - Shipping Location

20Table 6 — Fan Performance — 48HGF016 (High Heat Units) — Vertical Discharge Units*LEGEND*For standard motor with standard drive, the drive range is

Page 14

21Table 7 — Fan Performance — 48HGD020 (Low Heat Units) — Vertical Discharge Units*LEGEND*For standard motor with standard drive, the drive range is 6

Page 15 - 2. Dimensions are in inches

22Table 8 — Fan Performance — 48HGF020 (High Heat Units) — Vertical Discharge Units*LEGEND*For standard motor with standard drive, the drive range is

Page 16

23Table 9 — Fan Performance — 48HGD024 (Low Heat Units) — Vertical Discharge Units*LEGEND*For standard motor with standard drive, the drive range is 6

Page 17

24Table 10 — Fan Performance — 48HGF024 (High Heat Units) — Vertical Discharge Units*LEGEND*For standard motor with standard drive, the drive range is

Page 18

25Table 11 — Fan Performance — 48HGD028 (Low Heat Units) — Vertical Discharge Units*LEGEND*For standard motor with standard drive, the drive range is

Page 19

26Table 12 — Fan Performance — 48HGF028 (High Heat Units) — Vertical Discharge Units*LEGEND*For standard motor with standard drive, the drive range is

Page 20

27Table 13 — Fan Performance — 48HGD014 (Low Heat Units) — Horizontal Discharge Units*LEGEND*For standard motor with standard drive, the drive range i

Page 21

28Table 14 — Fan Performance — 48HGF014 (High Heat Units) — Horizontal Discharge Units*LEGEND*For standard motor with standard drive, the drive range

Page 22

29Table 15 — Fan Performance — 48HGD016 (Low Heat Units) — Horizontal Discharge Units*LEGEND*For standard motor with standard drive, the drive range i

Page 23

3ALTERNATE UNIT SUPPORT — When a curb cannot beused, install unit on a noncombustible surface. Support unitwith sleepers, using unit curb support

Page 24

30Table 16 — Fan Performance — 48HGF016 (High Heat Units) Horizontal Discharge Units*LEGEND*For standard motor with standard drive, the drive range is

Page 25

31Table 17 — Fan Performance — 48HGD020 (Low Heat Units) — Horizontal Discharge Units*LEGEND*For standard motor with standard drive, the drive range i

Page 26

32Table 18 — Fan Performance — 48HGF020 (High Heat Units) — Horizontal Discharge Units*LEGEND*For standard motor with standard drive, the drive range

Page 27

33Table 19 — Fan Performance — 48HGD024 (Low Heat Units) — Horizontal Discharge Units*LEGEND*For standard motor with standard drive, the drive range i

Page 28

34Table 20 — Fan Performance — 48HGF024 (High Heat Units) — Horizontal Discharge Units*LEGEND*For standard motor with standard drive, the drive range

Page 29

35Table 21 — Fan Performance — 48HGD028 (Low Heat Units) — Horizontal Discharge Units*LEGEND*For standard motor with standard drive, the drive range i

Page 30

36Table 22 — Fan Performance — 48HGF028 (High Heat Units) — Horizontal Discharge Units*LEGEND*For standard motor with standard drive, the drive range

Page 31

37Table 24 — Operation Air Quantity LimitsTable 25 — Evaporator Fan Motor SpecificationsLEGENDBkW — Brake kilowatts48HGCOOLINGGAS HEATHEATINGMinimum C

Page 32

38Table 26 — Evaporator Fan Motor SpecificationsTable 27 — Fan RPM at Motor Pulley SettingsBase Unit OperationHEATINGNOTE: The 48HG units have 2 stage

Page 33

39Table 28 — IGC LED Indications LEGENDNOTES:1. There is a 3-second pause between error code displays.2. If more than one er

Page 34

4Fig. 3 — Rigging Details

Page 35

40ComfortLink™ Display Usage — The display mod-ule provides the user interface to the ComfortLink control sys-tem. See Fig. 23. The display has up and

Page 36

41SERVICECleaning — Inspect unit interior at beginning of each heat-ing and cooling season and as operating conditions require. Re-move unit top panel

Page 37

42Evaporator Fan Service and Replacement — The48HG units feature a slide-out fan deck for easy servicing ofthe indoor-fan motor, pulleys, belt, and be

Page 38 - Base Unit Operation

431. Enter the Service Test main menu on the display.2. Enter the TEST submenu and turn ON test mode. If thepassword has not already been entered, the

Page 39

44OFFONW-1W-2D-1D-2C1C2PILOTADJ.INLET PRESSURE TAP(PLUGGED)1/8 - 27 N.P.T. THDS.2 LEADS, #18 WIRE 1/32 INSULATION,600V. MAX., 105°CREGULATORADJUSTMENT

Page 40 - Clearing Unit Alarms —

45EVAPORATOR FAN MOTOR PROTECTION — A manu-al reset, calibrated trip, magnetic circuit breaker protectsagainst overcurrent. Do not bypass connections

Page 41 - Lubrication

46LEGENDFig. 36 — Low Voltage Control SchematicFig. 37 — Power Schematic and Fig. 38 — Component Arrangement_ _ .A —Circuit AAUX —Auxiliary Contact_ _

Page 42

47Fig. 36 — Low Voltage Control Schematic

Page 43

48Fig. 37 — Power Schematic

Page 44

49Fig. 38 — Component Arrangement

Page 45 - Diagnostic LEDs —

5Fig. 4 — Base Unit Dimensions

Page 46

50TROUBLESHOOTINGRefer to Tables 30 and 31 for troubleshooting details.Table 30 — Cooling Service Analysis LEGENDPROBLEM CAUSE RE

Page 47

51Table 31 — Heating Service Analysis LEGENDPROBLEM CAUSE REMEDYBurners will notignite.Misaligned spark electrodes. Check flame ignition and sen

Page 48 - Fig. 37 — Power Schematic

52Refer to Fig. 39 for IGC troubleshooting information.Fig. 39 — IGC Control (Heating and Cooling) LEGENDNOTE: Thermostat Fan Switch

Page 49

Page 50 - TROUBLESHOOTING

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 1

Page 51

Page 52

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 1

Page 53

6Table 1 — Physical DataLEGENDUNIT 48HG 014 016 020 024 028VOLTAG E208/230, 460 575 208/230, 460 575 ALL ALL ALLNOMINAL CAPACITY (Tons)121/2121/215 15

Page 54 - Ta b 1 a 6 a

7Step 4 — Field Fabricate Ductwork — Secure allducts to building structure. Use flexible duct connectors be-tween unit and ducts as required. Insulate

Page 55

8Step 6 — Install Flue Hood and Inlet Hood —Flue hood (smaller hood), inlet hood (larger hood), and screensare shipped inside the unit in the return a

Page 56 - II. START-UP

9Step 9 — Make Electrical ConnectionsFIELD POWER SUPPLY — Unit is factory wired for volt-age shown on unit nameplate.When installing units, provide a