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Installation and maintenance manual 304 C – 02/06 D Date: June 2002 Supersedes: 304 C- 02/01 C Air cooled water chillers Air cooled motocondensing unit ALZ “B” 011.1 ÷ 038.2 ALP “B” 011.1 ÷ 038.2 Cooling capacity from 40 to 145 kW 50Hz –...
Physical damage to unit after acceptance is not McQuay responsability. Responsabilities McQuay Italia declines all present and future responsabilities referred to injuries to people and damage to things and unit, coming from operators negligence, the unrespected installation/maintenance data carrier in this manual, the lacking of the current regulations respect referred to the safety of the equipment and the qualified personnel.
Safety measures The unit must be suitably clamped to ground. It is necessary to follow these cautions and warnings: - The unit must be lifted only by using the proper tools able to support the weight of the unit. - No admittance to unauthorized or unqualified personnel. - No operation on electrical components is allowed without having switched off electricity supply.
2000 mm from said obstacles (fig. 3). In the event the obstacles are higher than the units, the units should be at least 2500 mm from the obstacle (fig. 4). For other installation solutions, consult McQuay technicians. Acoustic protection The low noise levels of the ALZ units means that they meet most of the most restrictive regulations.
Freeze protection If the unit is installed in an area where the ambient temperature can fall below 0°C, the heat exchanger, the piping and the inertial water tank can be damage by frost, despite the electric heater (standard supplied on the heat excharger and the tank).
After the alarms have been cleared either with automatic reset or by pressing the and buttons simultaneously for 5 seconds (for alarms with manual reset), the controller will restore normal operating conditions: • the buzzer turns off • the alarm relay disenergizes •...
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Main board (single tandem) The main board represents the core of the system, where the signals coming from the probes are processed. The modular structure of "µchiller" allows to get great flexibility and high performance. The compressor board, for example, can be upgraded by adding a module for the regulation of the capacity-controlled routine of the compressor or for the activation of a second tandem.
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The single compressor board has been designed so as to support two connected terminals, allowing therefore data access from two different points; it can also work without any connected terminal, ensuring this way a total safety to the data. Second tandem board It represents an expansion of the main board.
Meaning of LED indicators in single-compressor units Flashing Steady Tandem 1 Request for tandem 1 Tandem 1 actuated Request for tandem 2 Tandem 2 actuated Tandem 2 Request for tandem 1 at 100% Tandem 1 actuated at 100% Cooling Cooling Heating Χ100 Value Χ100...
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Buttons and relative messages on display Microprocessor ALZ 011.1÷038.2 Setting and displaying the set point and the main control parameters (DIRECT parameters). The DIRECT parameters are set-points and main control parameters of the unit (1 and 2 circuit water temperature, 1 and 2 circuit condensation temperature/pressure).
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Summary of the meaning of each button: Button Status of the unit Effect after pressing the button Normal operating condition (display after 5” DIRECT parameters appear shows the temperature of sensor B1) List of codes displays value Displays values displays list of codes Normal operating condition after 5”...
Start up and shut down Pre start-up • With main switch Q10 open, check all electrical connections in control panel and starter to be sure they are tight and provide good electrical contact. Although connections are tightened at the factory, they may have loosened enough in shipment to cause a malfunction.
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We reserve the right to make changes in design and construction at any time without notice, thus the cover picture is not binding. McQuay Italia S.P.A. S.S. Nettunense, km 12+300 – 00040 Cecchina (Roma) Italia – Tel. (06) 937311 – Fax (06) 9374014 – E-mail: mcquay@mcquayitalia.com...
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