McQuay MDS030A Design & Installation Guide

-100-
Design & installation Guide For McQuay MDS Multi System
Testing
C H A P T E R
5
5.1. MDS hardware diagram and configuration
5.1.1 MDS series indoor units
The indoor unit consists of a three-speed fan and an electronic expansion valve (electric heater and swing
function optional). The four temperature sensors respectively serve to measure the temperature of the indoor,
inlet coil, midlet coil and outlet coil. The MDS-A system can connect with a remove control or remote receiver
and, as a slave unit, communicates with outdoor units via RS485 interface. The DIP switches on the controller
determine the electric heater, power, unit model and address number.
MRS485 terminal resistor J2-1: ON/OFF indicate whether resistance is present or not.
Power supply
Temperature measurement
Communication port 1
Communication port 2
Memory 3
Model 2 SW1.1 SW1.2 SW1.3 SW1.4 SW1.5 SW1.6
OFF: No Electric heater 1 Electric heater 2 Pump Reserve Reserve Reserve
ON: Yes
Model 2 setting (SW1.1 —— SW1.6)
3-speed fan
Electronic expansion valve
indicator
Electric heater
Swing
SW1:DIP switch
for function setting
SW2: DIP switch for
indoor unit address setting
SW3: DIP switch
for model setting

McQuay MDS030A Specifications

General

Brand	McQuay
Model	MDS030A
Category	Air Conditioner
Language	English