Lennox PCUS User Manual page 3

ATTENTION
ATTENTION: the equipment must be installed
in accordance with the rules, make sure that the
power supply is disconnected.
ATTENTION: the electrical connections, the
installation of the heat recovery units and their
accessories must be carried out only by persons
in possession of the technical-professional
requirements to qualify for the installation,
transformation, expansion and maintenance of the
systems and capable of to verify the same for the
purposes of safety and functionality. In particular,
for the electrical connections, the following checks
are required:
Before starting any operation, make sure that the general
power supply line is disconnected.
• The electrical connections to the control panels must be made by specialized personnel according to the diagrams
provided.
• Make sure that the voltage and frequency shown on the plate
• correspond to those of the electrical connection line.
• The use of adapters, multiple sockets and / or extensions is not allowed for the general power supply of the
recuperator.
Make the connection with cables with a section suitable for the power used and in compliance with local
regulations. Their size must in any case be such as to achieve a voltage drop in the starting phase of less
than 3% of the nominal one
• It is the installer's duty to install the power supply disconnector as close as possible to the unit and what is
necessary for the protection of the electrical parts.
• Connect the unit to an effective earth socket, using the appropriate screw inserted in the unit itself.
1. COMPOSITION OF PCUS CONTROLLER
1.1 PCUS UNIT
The PCUS control system consists of two parts, an LCD display and setting and a control unit which contains the
interface relays to be connected to the devices to be controlled, the connection inputs for the temperature probes.
The PCUSM system differs from the PCUS in the addition of a
Modbus RTU part.
2. PCUS REMOTE CONTROL INSTALLATION AND OPERATION
2.1 INSTALLATION OF PCUS REMOTE CONTROL
To secure the display to the electrical box:
• release the front plate of the control, gently acting on the interlocking fasteners placed on the lower part
• fix the base of the controller to the electrical box with two screws
• reposition the front plate
The control unit is contained in the electrical box on the machine
PCUS Thermostat - User Manual - 0821EN
• Measurement of the insulation resistance of
the electrical system
• Continuity test of the protective conductors.
ATTENTION: before carrying out any intervention,
equip yourself with suitable personal protective
equipment.
ATTENTION: Touching live components can cause
a dangerous electric shock.
ATTENTION: also consult the installation
manual supplied with the unit.
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