McQuay MMC075CR User Manual

MDB - 2004
Ducted Split Systems
Models: MDB 075-750B
 MDB 125-150C
 MDB 075-500BR
 MDB 125CR

McQuay MMC075CR Specifications

General

Brand	McQuay
Model	MMC075CR
Category	Air Conditioner
Language	English

Summary

General Specifications

Unit Construction

Details the casing construction, material, and finishing of the unit.

Compressor Details

Details the compressor type, internal suspension, and overload protection.

Safety Controls

Explains high/low pressure cut-outs and crankcase heaters for compressor protection.

Operating Guide

Performance Characteristics

50Hz R22 Cooling Performance

Presents cooling performance data for MDB and MMC series at 50Hz R22.

Power Table Data

Provides power consumption data for various MDB and MMC model combinations.

Wiring Diagrams (Cooling)

MDB 075B – MMC 075C Cooling Diagram

Presents the cooling wiring diagram for MDB 075B indoor and MMC 075C outdoor units.

MDB 100B – MMC 100B/100C Cooling Diagram

Provides cooling wiring diagram for MDB 100B indoor and MMC 100B/100C outdoor units.

MDB 100B (U1.4 CCT SLM3) / MMC 100B (Phase Protector) Cooling Diagram

Cooling wiring diagram for MDB 100B (U1.4 CCT SLM3) and MMC 100B (phase protector).

MDB 150B2 (Sequential) / MMC 075C x 2 Cooling Diagram

Cooling wiring diagram for MDB 150B2 (sequential) and MMC 075C x 2 outdoor units.

MDB 400B4/500B4 (Sequential) / MMC 100B x 4 & MMC 125B x 4 Cooling Diagram

Cooling wiring for MDB 400B4/500B4 (sequential) and multiple outdoor units.

Wiring Diagrams (Heatpump)

MDB 075/100BR (C3.0B) Export Indoor Diagram

MDB 125CR Export Indoor Diagram

MDB 150/200/250 BR2 Export Indoor Diagram

MMC 075CR/100BR Outdoor Heatpump Diagram (Version 2)

Heatpump outdoor wiring for MMC 075CR/100BR (sequential, phase protector).

MDB 400 BR4 (Sequential) / MMC 100BR x 4 Heatpump Wiring

Heatpump wiring for MDB 400BR4 (sequential) and MMC 100BR x 4 outdoor units.

Indoor Unit Installation

Preliminary Site Survey

Covers electrical supply, voltage fluctuation, and location convenience for installation.

Mounting Guidelines

Piping Installation

Operational Check Procedure

Lists checks for proper operation after wiring and charging, including fan and coil status.

Electrical Connection Precautions

Outlines general precautions for field wiring, voltage, grounding, and connections.

Outdoor Unit Installation

Condensing Unit Location Requirements

Specifies requirements for outdoor unit placement to ensure optimal cooling capacity and airflow.

Field Piping Guidelines

Notes on piping arrangements, filter dryer, sight glass, and maximum pipe length/bends.

Installation Clearance Requirements

MMC B/BR Series Clearance

Vacuuming and Charging Procedures

Details the vacuuming process to remove moisture and air, and the charging procedure.

System Refrigerant Charge Guidelines

Cooling Only Refrigerant Charge

Provides tables for refrigerant charge levels based on indoor/outdoor unit combinations.

Heatpump Refrigerant Charge

Lists refrigerant charge levels for heatpump models based on pipe size and CFM.

Servicing and Maintenance

Service Precautions

Warns about energizing crankcase heater and charging flammable gases during tests.

Usage Cautions

Advises against inserting objects into air outlets during operation.

Regular Maintenance

Operation Guide

Electrical Connection Procedures

Covers wiring regulations, local codes, and general precautions for electrical connections.

Sequential Controller Configuration

Operating Mode Settings

Cool Mode Sequential Control

Troubleshooting Guide

Fan Malfunction Troubleshooting

Troubleshooting steps for fan issues, including power, capacitor, motor, or switch faults.

Compressor Not Working Troubleshooting

Steps for troubleshooting compressor issues when fans are operational.

No Fan or Compressor Operation

Troubleshooting steps for when neither fans nor compressor operate.

Satisfactory Cooling Issues

Steps for insufficient cooling issues: thermostat, closed doors, dirty coil, obstructions, low refrigerant.