Control Logics; Fuses; Startup; Switching On The Unit - MAXA i-290 0106 Installer Manual

TERMINAL
X1-1/ X2-1/ X2-2
X3-1/ X3-2
X4-1/ X4-2
X5-1/ X5-2
X6-1/ X6-2
X7-1/ X7-2
X8-1/ X8-2
X9-1/ X9-2
X10-1/ X11-1
X10-2/ X11-2
X12-1/ X12-2/ X13-1
X14-1/ X14-2/ X15-1
5.13.4 Control logics
For control logics please refer to the MCO manual of unit control, which can be obtained from the manufacturer.
5.13.5 Fuses
Details of the type and nominal characteristics of the fuses can be found on the machine label, on the circuit diagrams and printed directly on
the control board.

6. STARTUP

Before start-up:
• Check that the diagrams and manuals of the installed machine are available.
• Check the availability of electrical and hydraulic diagrams of the system to which the machine is connected.
• Check that the shut-off valves of the water circuits are open.
• Check that the water circuit was filled under pressure and the air vented.
• Check that all hydraulic connections are correctly installed and that all indications on the rating plates are respected.
• Ensure that provisions have been made for condensate drainage.
• Check the electrical connection and correct fastening of all the terminals.
• Check that electrical connections have been carried out correctly according to current regulations including earthing.
• The voltage must be as stated on the nameplate of the unit.
• Make sure that the electric voltage is within the tolerance limits (±5%).
• Check that the electric heaters of the compressors are properly powered.
• Check, if required for the installation site, whether a residual current circuit breaker is installed.
• Check that there are no gas leaks. Each operator must equip himself with a personal explosimeter for R290 gas.
• Before switching the unit on, check that all panels are positioned correctly and well-fixed with screws.
• When switching on the machine, check that no more of one defrost is activated in the first 35 minutes of operation. Multiple consecutive
defrosts may indicate incorrect sizing of the unit with respect to the thermal load required by the application.
CAUTION: The unit must be connected to the electric mains and placed in STANDBY (powered on) by closing the master
switch at least 12 hours before start-up. This will allow the heaters to adequately warm up the compressor crankcase (the
heaters are powered automatically when the switch is closed). The heaters are working properly if after a few minutes the
temperature of the compressor crankcase is 10-15°C higher than ambient temperature.
CAUTION: Check that the weight of the pipes does not bear upon the machine structure.
CAUTION: Never use the master switch to stop the unit temporarily, this must only be done to disconnect the unit from the
power supply for long downtimes (e.g. seasonal stops etc.). Furthermore power is missing, the crankcase heaters will not be
powered with the risk of breaking the compressors when the unit is switched on.
CAUTION: Do not modify the electrical connections of the unit otherwise the warranty will be immediately void.
CAUTION: Summer/winter operation must be selected at the beginning of the relative season. In order not to cause damage
to the compressors, avoid frequent and sudden changes of this operation.
CAUTION: When installing and starting up for the first time, make sure that the machine operates correctly in both heating
and cooling mode.
6.1 SWITCHING ON THE UNIT
The unit is switched on via the remote interface function (i-CR). Please refer to the dedicated chapter for more information. All units in the i-290
series have no display mounted on board.

7. INSTRUCTIONS FOR THE USER

Write down the unit's identification data to be able to give it to the assistance centre when requesting an intervention.
CONNECTION
Connect the mixing valve
Connect the solar circulator
Connect the solar drain valve
Connect the relaunch circulator
Connect the mixing valve probe
Connect the ACC. solar probe
Connect the solar connector probe
Connect the ambient thermostat
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Modbus connection to the machine's CNTR board
i-290
Inverter air/water heat pumps with axial fans
TYPE
Digital outputs
Analogue inputs
Analogue outputs
Digital inputs
Modbus communication
41