Carrier NP034-074 사용자 설명서

Installation, Start-Up and

Service Instructions

CONTENTS

Page

GENERAL

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

SAFETY CONSIDERATIONS

. . . . . . . . . . . . . . . . . . . 2

INSTALLATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37

Rigging and Unit Placement

. . . . . . . . . . . . . . . . . . 2

Roof Curb

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Roof Mount

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Slab Mount

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Positioning

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

Field-Fabricated Ductwork

. . . . . . . . . . . . . . . . . . . . 6

Condensate Drains

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

Install Outdoor Hoods

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

• UNIT SIZES 034 AND 044
• UNIT SIZES 054-074

Outdoor-Air Inlet Adjustments

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

• MANUAL OUTDOOR-AIR DAMPER
• ECONOMIZER SETTINGS

Field Wire Routing

. . . . . . . . . . . . . . . . . . . . . . . . . . 17

• UNIT SIZES 034 AND 044
• UNIT SIZES 054-074

Field Electrical Connections

. . . . . . . . . . . . . . . . . 17

• POWER WIRING
• CONTROL WIRING

Gas Piping (48 Series Units Only)

. . . . . . . . . . . . 36

Installing Flue/Inlet Hoods (48 Series Units

Only)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

• UNIT SIZES 034 AND 044
• UNIT SIZES 054-074

PRE-START-UP

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 38-41

Unit Preparation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Compressor Mounting

. . . . . . . . . . . . . . . . . . . . . . . 38

Evaporator-Fan Shipping Brackets

. . . . . . . . . . . 38

• UNIT SIZES 034 AND 044
• UNIT SIZES 054-074

Internal Wiring

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Refrigerant Service Valves

. . . . . . . . . . . . . . . . . . . 38

Crankcase Heaters

. . . . . . . . . . . . . . . . . . . . . . . . . . 38

Compressor Oil

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Gas Manifold Pressure (48 Series

Units Only)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Unit Voltage

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Leak Test and Dehydration

. . . . . . . . . . . . . . . . . . 39

Evaporator-Fan Belts, Pulleys, and Sheaves

. . 39

Condenser Fans and Motors

. . . . . . . . . . . . . . . . . 40

Return-Air Filters

. . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Economizer Inlet Screens

. . . . . . . . . . . . . . . . . . . 40

Economizer Dampers

. . . . . . . . . . . . . . . . . . . . . . . 40

25% Outdoor-Air Damper

. . . . . . . . . . . . . . . . . . . . 40

Initial Check

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

START-UP

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41,42

General

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Operating Sequences

. . . . . . . . . . . . . . . . . . . . . . . 41

• COOLING, UNITS WITHOUT ECONOMIZER
• HEATING, UNITS WITHOUT ECONOMIZER

Page

• COOLING, UNITS WITH ECONOMIZER
• HEATING, UNITS WITH ECONOMIZER
• VENTILATION AIR CIRCULATION (Continuous Fan)
• AUTOMATIC CHANGEOVER USING AUTOMATIC

CHANGEOVER THERMOSTAT

Head Pressure Control

. . . . . . . . . . . . . . . . . . . . . . 42

SERVICE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42-53

Service Access

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

• COMPRESSORS
• LIQUID SERVICE VALVES, FILTER DRIERS, AND

SIGHT GLASSES

• EVAPORATOR-FAN MOTORS, PULLEYS, AND

BELTS

• POWER EXHAUST MOTORS, PULLEYS, AND

BELTS

• UNIT CONTROL BOX
• GAS HEAT SECTION (48 Series Units Only)
• MAIN AND PILOT BURNERS (48 Series Units Only)
• FLUE GAS PASSAGEWAYS (48 Series Units Only)
• COMBUSTION AIR BLOWER (48 Series Units Only)
• ECONOMIZER DAMPER MOTOR
• ELECTRIC HEATER CONTROL BOX (50 Series

Units Only)

• HEATER BOX (50 Series Units Only)
• 25% OUTDOOR-AIR DAMPER
• MODULATING POWER EXHAUST DAMPER

MOTOR

• RETURN-AIR FILTERS
• CONDENSER FANS AND FAN MOTORS
• INLET GUIDE VANE MOTOR

Cleaning

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Lubrication

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

• COMPRESSORS
• FAN SHAFT BEARINGS
• INLET GUIDE VANE BEARINGS (Units With

Optional Inlet Guide Vanes)

• FAN MOTOR BEARINGS
• DOOR HINGES

Adjustments

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

• EVAPORATOR FAN AND POWER EXHAUST

MOTOR PLATE

• MODULATING POWER EXHAUST DIFFERENTIAL

PRESSURE SWITCH

• INLET GUIDE VANE DIFFERENTIAL PRESSURE

SWITCH (Units With Optional Inlet Guide Vanes and
Static Pressure Control)

• BELT INSTALLATION AND TENSIONING
• PULLEY ALIGNMENT
• INSTALLING ALTERNATE MOTOR PULLEY

(Evaporator Fan Only)

• CONDENSER FAN ADJUSTMENT
• 25% OUTDOOR-AIR DAMPER
• REFRIGERANT CHARGE
• PILOT LIGHT OFF (48 Series Units Only)

48DJ,DK,NP034-074

50DJ,DK,DW,DY,NB,NP034-074

Single Package Heating and Cooling Units

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

Book 1

Tab

1a 1b

PC 111

Catalog No. 564-818

Printed in U.S.A.

Form 48/50D,N-9SI

Pg 1

3-96

Replaces: 48DJ,DK-3SI;

48/50NB,NP-1SI; 50DJ,DK-9SI