Testing - McQuay MDS030A Design & Installation Manual

Design & installation Guide For McQuay MDS Multi System
C H A P T E R
5
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Testing

5.1. MDS hardware diagram and configuration
5.1.1 MDS series indoor units
Power supply
Temperature measurement
Communication port 1
Communication port 2
Memory 3
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.
SW1:DIP switch
for function setting
Model 2 setting (SW1.1 °™°™ SW1.6)
Model 2 SW1.1
OFF: No Electric heater 1 Electric heater 2
ON: Yes
SW2: DIP switch for
indoor unit address setting
SW1.2 SW1.3
Pump
3-speed fan
Electronic expansion valve
indicator
Electric heater
Swing
SW3: DIP switch
for model setting
SW1.4 SW1.5
Reserve Reserve
SW1.6
Reserve