Carrier 48MA/50ME016-040 specifications Gas Heat Lighting Procedure 48MA, Adjustment

Page 35

 

LEGEND

 

HA Ð Heat Anticipator

Screw Terminal

HU Ð Humidistat

Printed Circuit

TC

Ð Thermostat, Cooling

TH

Ð Thermostat, Heating

Factory Control Wires

Field Wiring

Fig. 30 Ð Humidistat Connections

The heating thermostat energizes a 115-v solenoid by means of a gas valve relay and the pilot lights. The main burner comes on after the pilot is proven.

The safety switches (air¯ow switches 1 and 2, pilot ¯ame sensor, door switch, and limit switches) are in series with the gas valve.

Gas Heat Lighting Procedure (48MA)

1.Purge gas supply line of air. Make sure unit main manual and zone module gas valves have been off for 5 minutes before proceeding.

2.Set each zone thermostat to the lowest setting.

3.Turn zone module and main manual gas valves to ON position, and secure door of burner compartment.

4.Turn on unit main power supply. Set control circuit serv- ice switch in condensing control box at ON position. Evapo- rator fan will be energized.

5.Set zone thermostat to call for heat. Pilot will light. The main burner will come on after the pilot is proven.

NOTE: A time-delay relay will shut unit down in 180 sec- onds if main manual gas valve is not open.

TO SHUT OFF GAS HEAT Ð Set control circuit service switch at OFF position. Shut off unit power supply only if necessary. Remove heating controls compartment access door. Shut off main manual gas valves and pilot manual gas valves.

Intermittent Pilots (48MA) Ð Pilot ¯ame should be approximately 1 to 11¤2 in. high.

ADJUSTMENT

1.Turn system switch to OFF position.

2.If intending to adjust every zone, disconnect main gas valve wires from terminal W on pilot switches in each zone.

 

 

LEGEND

 

 

 

CCP

Ð

Capacity Control Pressure Switch

LPS

Ð

Low-Pressure Switch

DLT

Ð

Discharge Line Thermostat

OFM

Ð Outdoor (Condenser) Fan Motor

FCPS

Ð

Fan Cycling Pressure Switch

TXV

Ð

Thermostatic Expansion Valve

FP

Ð

Fusible Plug

 

 

Hand Valve

HGBP

Ð

Hot Gas Bypass

 

 

 

 

 

HPS

Ð

High-Pressure Switch

 

 

Auto. Valve

IFM

Ð

Indoor (Evaporator) Fan Motor

 

 

LLS

Ð

Liquid Line Solenoid

 

 

Capilliary

 

 

 

 

 

Fig. 31 Ð Refrigerant Piping Schematic (10-Zone Unit Shown Ð 8- and 12-Zone Units Similar)

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Contents Contents Installation, Start-Up Service InstructionsInstallation Safety ConsiderationsBase Unit Physical Data and Dimensions 48MA Units Base Unit Physical Data and Dimensions 50ME Units Roof Curb Detail Removing Shipping Shields FigPhysical Data Roof Curb Physical Data and Dimensions 48MA Units Roof Curb Physical Data and Dimensions 50ME Units Shipping Shield Locations Units Shown Suggested Gas Piping 48MA Unit 48MA Electrical Data Unit 50ME Electrical Data Unit 50ME Electrical Application Data ECT Field Control WiringZone Control Board Component Location Cooling Cooling Stage 1 Ð First stage of modules 1, 2, Cooling Stage 1 Ð First stage of modules 1, 2, 3, Cooling Stage 1 Ð Modules 1 and 3 Stage 2 Ð Modules 2 Cooling Modules Setting Stage 1 Ð First stage of modules 1 Cooling Stage 1 Ð First stage of modules 1, 2, Cooling 50ME Two-Stage Heat, One-Stage Cool Ð 4 Module Joint Control Cooling Stage 1 Ð Modules 1 and 3 Stage 2 Ð Modules 2 Cooling Modules Setting HA1 HA2 APS START-UPAdjustment Gas Heat Lighting Procedure 48MAMGV Pressure Adjustment Natural GASSpoiler Screw Location Units with 3-ELEMENT Heaters Units with 2-ELEMENT HeatersCondenser and OUTDOOR-AIR Cooling Coils ServiceAir¯ow Switches Cabinet Panels and GrillesLOW Charge Compressor Capacity Control UnloadersHead Pressure Control To ADD or Remove OILFAN Shaft Bearing Removal Condenser FansEvaporator Fans and Motor Operation Forced-Draft Blower 48MAOptional Economizer Ð See Fig Pulley RemovalEconomizer and Exhaust Damper Assemblies, Exploded View Page Page Packaged Service Training Page Model no Serial no Date Technician OUTDOOR-AIR TemperatureRETURN-AIR Temperature PRE-START-UP

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.
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