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EN/36B/08.2018 © STULZ SpA – all rights reserved
7. Start-up
ATTENTION
Before you first start up the system install and connect it as described in the "Installation" chapter.
DANGER
Never run the machine if you have discovered leakage of the coolant fluid. If traces of oil are
present on the unit, which point to a loss of coolant, on the inside or the outside, then the
equipment must be thoroughly checked before starting the unit. If necessary, please contact
your local STULZ service partner.
INFORMATION
Two keypads are available: ACTKPDC1010H is a 4x20 display and is necessary for the start-up
of the units. Only this keypad allows full access to all parameters. All operations described in the
chapter "7. Start-up" require the use of ACTKPDC1010H. ACTUKPD is a keypad with 3-digit
display for user functions, such as set points setting, alarm display and reset, counters display..
• Make sure the main switch is turned off and that the system is isolated from power mains.
• Check that all power switches in the electric system have been turned off.
• Check that the main electric supply cable and the terminals, including the PE terminals, are
correctly hooked up.
• Check that contactors are free to move.
• Switch on the conditioner with the general switch.
• Enable the control fuses one by one and the fan and compressor power switches.
• Check the supply voltage on all phases and on the direct current circuit.
• Pre-heat the compressor sump for 3-4 hours when first starting up the system or when re-starting
it after a long down time if the conditioner has been inactive in rooms with temperatures lower than
0°C.
• At this point the electronic board is powered and the single components of the system can be
activated to check for proper operation.
• Set the desired return air temperature (parameter S01) on the conditioner display.
• Start the climate control system by pressing the ON-OFF push-button on the display.
• After about 20 minutes of operation check the liquid and humidity passage window for air bubbles
in the liquid pipe. If there are bubbles this may have been caused by a leak and loss of refrigerant.
Check the circuit for leaks. Repair all leaks and refill the circuit with R407C refrigerant as
described in paragraph "8.4. Refrigerant circuit".
ON / OFF
