Carrier 48MA/50ME016-040 用户手册

Installation, Start-Up

and Service Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS

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

INSTALLATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34

General

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

Unit Clearances

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

Roof Curb

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

Roof Openings

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

Rigging Unit

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Unit Positioning

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Removing Shipping Shields

. . . . . . . . . . . . . . . . . . 5

Field-Fabricated Ductwork

. . . . . . . . . . . . . . . . . . . . 5

Condensate Drains

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

Gas Piping (48MA)

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

Optional Glycol Connections (50ME)

. . . . . . . . . 10

Field Power Supply Wiring

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

• UNIT COMMON FEED MINIMUM CIRCUIT AMPS

Field Control Wiring

. . . . . . . . . . . . . . . . . . . . . . . . . 14

• ZONE THERMOSTATS
• ZONE MODULE CONNECTIONS
• ACCESSORY REMOTE CONTROL PANEL

Reheat Humidity Control

. . . . . . . . . . . . . . . . . . . . 34

Optional Economizer

. . . . . . . . . . . . . . . . . . . . . . . . 34

Optional Exhaust Damper

. . . . . . . . . . . . . . . . . . . 34

START-UP

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-39

Evaporator Fan

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Compressor Rail Shipping Bolts

. . . . . . . . . . . . . 34

Refrigerant Valves

. . . . . . . . . . . . . . . . . . . . . . . . . . 34

Zone Module Gas Valves (48MA)

. . . . . . . . . . . . . 34

Gas Heat Lighting Procedure (48MA)

. . . . . . . . . 35

• TO SHUT OFF GAS HEAT

Intermittant Pilots (48MA)

. . . . . . . . . . . . . . . . . . . 35

• ADJUSTMENT
• PRESSURE ADJUSTMENT (NATURAL GAS)

Main Burner Adjustment (48MA)

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

• ORIFICE ALIGNMENT
• PRIMARY AIR ADJUSTMENT

Outdoor-Air Thermostat Adjustment

(50ME With Electric Heat)

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

• UNITS WITH 2-ELEMENT HEATERS
• UNITS WITH 3-ELEMENT HEATERS

Optional Glycol Heating Coils

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

Zone Airflow Adjustment

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

Sequence of Operation

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

• COOLING
• HEATING (48MA)
• HEATING (50ME WITH ELECTRIC HEAT)
• HEATING (50ME WITH GLYCOL HEATING COILS)
• OUTDOOR-AIR DAMPER

SERVICE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39-43

Cabinet Panels and Grilles

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

• SIDE PANELS
• TOP PANELS
• HEATER ACCESS PANELS

Cleaning

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

• EVAPORATOR COILS (ZONE COOLING COILS)

AND GLYCOL HEATING COILS

• CONDENSER AND OUTDOOR-AIR COOLING

COILS

• CONDENSATE DRAINS
• INDOOR-AIR FILTERS
• OUTDOOR-AIR INLET SCREENS
• GAS HEATING SECTION
• COMBUSTION AIR FAN

Airflow Switches

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

• INDOOR AIRFLOW SWITCH (AFS1)
• COMBUSTION AIRFLOW SWITCH (AFS2)

Service Switch

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

Time Guard

Control Circuit

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

Capacity Control Pressure Switches (CCP)

(2-Compressor Units Only)

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

Compressor Oil

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

• TO ADD OR REMOVE OIL

Compressor Capacity Control Unloader(s)

. . . . 40

• CONTROL SET POINT
• PRESSURE DIFFERENTIAL

Crankcase Heater(s)

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

Refrigerant Charge

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

• NO CHARGE
• LOW CHARGE

Head Pressure Control

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

• MOTORMASTER

t HEAD PRESSURE CONTROL

DEVICE

• FAN CYCLING PRESSURESTAT

Condenser Fans

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

• ADJUSTMENT
• FAN MOTOR REMOVAL
• LUBRICATION

Evaporator Fans and Motor

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

• MOTOR REMOVAL
• FAN SHAFT BEARING REMOVAL
• FAN SPEED ADJUSTMENT
• PULLEY REMOVAL
• PULLEY ALIGNMENT
• BELT TENSION ADJUSTMENT
• LUBRICATION

Forced-Draft Blower (48MA)

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

• LUBRICATION
• AIR SHUTTER ADJUSTMENT

Zone Module Transformers

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

Optional Economizer

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

• THERMOSTAT SETTINGS
• DAMPER POSITION
• OPERATION

Optional Exhaust Damper

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

Replacement Parts

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

START-UP CHECKLIST

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

48MA/50ME016-040

Combination Multizone Heating/Cooling Units

Gas, Electric, or Glycol Heat

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

Book 1

Tab

1c 1d

PC 111

Catalog No. 564-840

Printed in U.S.A.

Form 48MA/50ME-3SI

Pg 1

4-96

Replaces: 48MA/50ME-1SI