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Carrier 48MA/50ME016-040 specifications Installation, Start-Up Service Instructions, Contents

Models: 48MA/50ME016-040

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48MA/50ME016-040 Combination Multizone Heating/Cooling Units Gas, Electric, or Glycol Heat

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 Air¯ow 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

Air¯ow 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 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

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

Book

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PC 111

Catalog No. 564-840

Printed in U.S.A.

Form 48MA/50ME-3SI

Pg 1

4-96

Replaces: 48MA/50ME-1SI

Tab

1c

1d

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Carrier 48MA/50ME016-040 specifications Installation, Start-Up Service Instructions, Contents
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48MA/50ME016-040 specifications

The Carrier 48MA/50ME016-040 series represents a significant advancement in the field of commercial HVAC systems, designed to provide reliable, efficient, and effective climate control solutions for various applications. These units are widely recognized for their durability and performance, making them a top choice for building owners and managers seeking optimal comfort and energy efficiency.

One of the main features of the Carrier 48MA/50ME series is its advanced scroll compressor technology. The scroll compressors are known for their reliability and efficiency, which leads to reduced energy consumption and lower operating costs. This high-efficiency design not only contributes to significant energy savings but also minimizes noise levels, enhancing the overall comfort of the environment.

The units are equipped with a unique microprocessor-based control system that offers precise temperature control and flexibility. This technology allows for easy integration with building management systems, enabling users to monitor and control their HVAC systems remotely, thereby optimizing performance and energy use. The programmable thermostats help to tailor the operation of the units to meet the specific needs of the users, ensuring maximum comfort at all times.

In addition to its robust performance features, the Carrier 48MA/50ME series also boasts a comprehensive line of options for customization. These options include various cooling capacities ranging from 16 to 40 tons, allowing the equipment to cater to different building sizes and requirements. The series is also designed with a compact footprint, making it suitable for rooftop installations where space is at a premium.

Another important characteristic of the series is its environmentally friendly refrigerant options. Carrier prioritizes the use of refrigerants with low global warming potential, contributing to a more sustainable approach to HVAC solutions. This commitment to environmental responsibility not only complies with regulations but also meets the increasing demand for greener technologies.

Furthermore, the robust construction of the Carrier 48MA/50ME series ensures long-lasting performance in even the harshest conditions. The units are designed to withstand various environmental factors, making them ideal for both commercial and industrial applications. Overall, the Carrier 48MA/50ME016-040 series stands out as a reliable choice for efficient and effective heating and cooling solutions, equipped with innovative technologies that prioritize performance, sustainability, and user comfort.