McQuay MDS Series User Manual

Service Manual
SM-MDS_(ii)
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Engineered for flexibility and performance
TM

McQuay MDS Series Specifications

General

Type	Scroll
Refrigerant	R-407C
Motor Type	Hermetic
Voltage Options	208/230/460/575V
Frequency	60 Hz
Weight	Varies with model
Stages	Single Stage

Summary

Preface

1.0 Introduction

1.1 Digital Scroll Compressor

Explains the use of digital scroll compressor technology and lists models.

1.2 Operating Range

Shows cooling and heating cycle operating ranges in Celsius.

1.3 Basic Layout of MDS System

Illustrates the system components: outdoor unit, indoor unit, refnet, distributor, EXV box.

1.4 Maximum Connectible Indoor Units

Table showing the maximum number of indoor units connectable per outdoor unit.

1.5 Maximum Piping Length

Details on maximum equivalent and actual piping lengths for R-22 and R-410A systems.

1.6 Refnet and Distributor

Lists refnet joints and distributors, and shows dimensions for specific models.

1.7 EXV Box (MEX)

Lists indoor models with their respective EXV box models and pipe diameters.

2.0 System and Control

2.1 MDS Outdoor System and Control

Provides circuit diagrams for cooling and heating modes.

2.2 MDS Indoor System and Control

Covers sensor locations, EXV control, fan speed control, and anti-freeze protection.

2.3 MDS System Piping Connection

Details on refnet/distributor connections, limitations, tilting angles, and orientations.

2.4 Heater Control

Explains the control algorithm for optional indoor heaters in heating or fan modes.

2.5 Outdoor Ball Valve Operation

Step-by-step instructions for operating gas and liquid side ball valves during service.

3.0 PCB & Wiring

3.1 MDS Outdoor Unit PCB

Identifies MDOM and MDS-M PCBs, listing component locations and functions.

3.2 MDS Indoor Unit PCB

Identifies MC200-C and MC201-C PCBs, listing component locations and functions.

3.3 MDS System Wiring

General information on wiring connections, communication protocols, and cable recommendations.

3.3.1 Wiring Connection Between MDS Outdoor to Indoor Units

Details on connecting outdoor to indoor units via green terminal (Ain/Bin).

3.3.2 Wiring Connection Between MDS Outdoor Units

Wiring between multiple outdoor units, including jumper JP6 for the last unit.

3.3.3 Wiring Connection Between MDS Master and Slave Unit

Wiring for master/slave configurations, including terminal numbers.

3.4 Handsets for MDS System

Introduces types of handsets (wireless, wired, central) for controlling MDS indoor units.

3.4.1 Wireless Handset G17

Details on features and operations of the wireless handset G17.

3.4.2 Wired Controller MC301

Explains operations of the MC301 wired controller, including ON/OFF, temp setting, fan speed.

3.4.3 Central Controller MC303

Details operations of MC303 central controller (Address Register, Mode Setting, Temp Setting).

3.4.4 Handsets Wiring

Wiring diagram for Central Controller MC303 to indoor units via daisy chain.

4.0 Commissioning Software

4.1 Introduction

Introduces Smart Commander software for commissioning and troubleshooting MDS systems.

4.2 Hardware Requirement

Lists the minimum hardware requirements for running the Smart Commander software.

4.3 Installation of Smart Commander

Step-by-step guide for installing the Smart Commander software.

4.4 Wiring Connection

Details wiring connections between outdoor units, gateway, and computer.

4.5 Setup of Smart Commander

Guides users through setting up the Smart Commander software and connecting to the system.

4.6 Smart Commander Software Interface

Describes the Circuit Monitor and Server Monitor windows of the Smart Commander software.

4.6.1 Circuit Monitor

Interface for monitoring all indoor and outdoor parameters, showing unit selection.

4.6.2 Service Monitor

Interface for plotting system parameters as graphs, allowing parameter selection.

4.6.3 Additional Function

Details how to modify outdoor unit parameters and special operation orders.

5.0 Commissioning

5.1 Obtain Design Drawing and Report

Explains the importance of design drawings and reports for a smooth commissioning process.

5.2 Check Piping Routing, Wiring Routing & Connection

Details checks for piping insulation, EXV box orientation before commissioning.

5.3 Add in Additional Refrigerant

Explains methods for calculating and adding required refrigerant based on piping length.

5.4 Confirm Indoor Dipswitch Setting

Guides on checking indoor unit dipswitch settings for address, model, capacity, and function.

Dipswitch 2 (SW2) Outdoor Address Setting

Details dipswitch settings for outdoor address, capacity, and model selection.

Dipswitch 3 (SW3) Indoor Model and Capacity

Explains dipswitch settings for indoor model and capacity identification.

Dipswitch 4 (SW4) Reserved

Notes that Dipswitch 4 is reserved for software upgrades and should be OFF.

5.5 Power Up All Indoor

Instructions for powering up indoor units and activating auto-random restart function.

5.6 Confirm Outdoor Dipswitch Setting

Guides on checking outdoor unit dipswitch settings for MDOM and MDS-M PCBs.

5.6.1 Setting Up MDOM PCB

Steps for setting up MDOM PCB dipswitches (J1, J2) and indoor quantity.

5.6.2 Setting Up MDS-M PCB

Steps for setting up MDS-M PCB dipswitches (S1, S2, S3) for model, capacity, and indoor quantity.

5.7 Power Up Outdoor

Guides on powering up outdoor units and using Smart Commander for verification.

5.8 Start All Indoors

Instructions for starting all indoor units and performing outdoor/indoor checks.

5.9 Monitor Outdoor Parameter

Advises monitoring outdoor parameters after refrigerant addition and provides reference data.

6.0 Troubleshooting

6.1 Locating Error Code

Explains where error codes are displayed on indoor and outdoor units.

6.2 Error Code for Decorative Type Indoor

Lists error codes for decorative indoor units and their possible causes.

6.3 Indoor Error Code for Wired Controller MC301

Lists indoor error codes displayed on MC301 controller and their causes.

6.4 Outdoor Error Code for MDOM PCB

Lists error codes for MDOM PCB outdoor units and their causes.

6.5 Outdoor Error Code for MDS-M PCB

Lists error codes for MDS-M PCB outdoor units and their causes.

6.6 Troubleshooting Flow Chart - Sensor Failure

Flow chart for diagnosing indoor/outdoor sensor failures.

Outdoor Pressure Sensor Error Flow Chart

Flow chart for diagnosing outdoor pressure sensor errors.

Indoor Pump Error Flow Chart

Flow chart for diagnosing indoor pump errors.

Communication Error Flow Chart

Flow chart for diagnosing communication errors between units.

Compressor Overload Flow Chart

Flow chart for diagnosing compressor overload issues.

High/Low Pressure Switch Trip Error Flow Chart

Flow chart for diagnosing high/low pressure switch trip errors.

Master/Slave Communication Error Flow Chart

Flow chart for diagnosing master/slave communication errors.

System Malfunction Error Flow Chart

Flow chart for diagnosing general system malfunction errors.

Outdoor Storage Malfunction Flow Chart

Flow chart for diagnosing outdoor storage malfunction errors.

Indoor and Controller Communication Error Flow Chart

Flow chart for diagnosing indoor and controller communication errors.

Ambient Temperature Beyond Limit Flow Chart

Flow chart for diagnosing ambient temperature limit errors.

Wired Controller Storage Problem Flow Chart

Flow chart for diagnosing wired controller storage problems.

Superheat Protecting Value Too Small Flow Chart

Flow chart for diagnosing superheat protection value issues.

Emergency Run Flow Chart

Flow chart for diagnosing emergency run conditions.

Wrong Hardware and Software Combination Flow Chart

Flow charts for diagnosing hardware/software combination errors.

PCB Setting Error Flow Chart

Flow chart for diagnosing PCB setting errors.

7.0 Appendix

7.1 Compatibility Chart for Indoor and Outdoor PCB

Charts showing compatibility between various indoor and outdoor PCBs.

7.2 Compatibility Chart for Wired Handset MC301

Compatibility matrix for MC301 wired handset with different indoor PCBs.

7.3 Pressure Sensor Voltage and Resistance Value (High Pressure)

Provides voltage and resistance values for high pressure sensors.

7.3 Pressure Sensor Voltage and Resistance Value (Low Pressure)

Provides voltage and resistance values for low pressure sensors.

7.4 Character Reference for 7 Segment LED

Reference table for characters displayed on 7-segment LEDs for error codes.

7.5 Temperature Sensor Resistance Value

Lists resistance values for temperature sensors (excluding TH1, TH8) at various temperatures.

7.6 Hardware Configuration for 5MDS Outdoor

Shows wiring and configuration details for 5MDS outdoor units on MDS-M PCB.

7.7 R22 MDS-A Series Cooling Cycle Reference

Reference data for R22 MDS-A series in cooling cycle for models 030 and 040.

7.8 R22 MDS B Series Cooling Cycle Reference

Reference data for R22 MDS B series in cooling cycle for models 080.

7.9 R22 MDS A Series Heating Cycle Reference

Reference data for R22 MDS A series in heating cycle for models 030, 040, 050.

7.10 R22 MDS B Series Heating Cycle Reference

Reference data for R22 MDS B series in heating cycle for models 080 and 100.

7.11 R410A MDS B Series Cooling Cycle Reference

Reference data for R410A MDS B series in cooling cycle for models 050 and 060.

7.12 R410A MDS B Series Heating Cycle Reference

Reference data for R410A MDS B series in heating cycle for models 050 and 060.

7.13 R22 MDS BHC Series Cooling Cycle Reference

Reference data for R22 MDS BHC series cooling cycle for models 080/100/120BHC.

7.14 Refrigerant Circuit Diagram

Illustrates refrigerant circuit diagrams for various MDS models.

7.15 Key Card Access Feature

Explains the key card access feature for indoor units and required components.

7.16 Error Code for Phase Protector

Shows LED indicators and actions for phase protector errors.