Control Operation Guide - McQuay R410A INVERTER SERIE Installationsanleitung

The unit is equipped with a microprocessor controller board. The microprocessor controller is provided to give temperature
control for the system by accurately measuring and controlling the water entering and water leaving temperature. The temperature
setting in the unit is preset in the factory. It is not recommended to change the setting unless necessary. A wired controller
handset is connected to the microprocessor board. Every parameter setting and reading can be observed from the LCD of the
handset.
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1. Handset location
The handset is located in the terminal box behind the service panel.
2. LED Display (microprocessor board)
The keypad LED will light up when the unit is powered up.
The LCD will light up when the unit is turned on.
3. LCD display (controller handset)
During normal operations, the LCD can display the entering water temperature, the leaving water temperature, the enter-
ing water setpoint temperature, compressor on or off status and outdoor air temperature. When malfunctioning occurred,
the LCD would blink. The display would show the faulty parameter and the date and time of the occurrence.
4. Controller functioning specification
There is a 3 minute delay for the compressor and fan motor to restart (default setting).
During defrosting, fan motor is not running.
• Use the controller handset to switch on / off the unit. Do not plug off the main power supply directly, it would cause
the unit to breakdown. In case of emergency switch off the isolator switch located on the front panel of the unit.
• Do not change the settings of the safety devices.

CONTROL OPERATION GUIDE

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MAIN BOARD
SW2
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