Stulz Tel-Air-2 Series, Operating Instructions Manual

Page: 52 / 72

E/0618/35A/52
8. Start-up
Before performing initial start-up, install and connect the system as described in the
“
Installation
”
chapter.

Make sure the general switch is turned off and that the system is not live.

Check that all the power switches and control fuses in the electrical system are off.

Check that the power cable and terminals, including the PE terminals, are correctly
connected.

Check the contactors move freely.

Switch on the conditioner with the general switch.

Enable the control fuses one by one and the fan and compressor power switches.

Check the input voltage on all the phases and on the direct current circuit (if present).

When starting up for the first time or after a long period, if the conditioner has remained
inactive in environments with temperatures below 0°C, preheat the compressor sump for 3-4
hours.

At this point the electronic board is powered and individual components can be enabled to
check they work properly. The main operations that can be performed during installation are
described in the next paragraph. Additional indications can be found in the C2020 electronic
board manual.

Set the required return air temperature on the conditioner display.

Press the ON-OFF button on the display to start the conditioner.

After about 20 minutes, check the sight glass for air bubbles. If there are, some refrigerant
may have leaked. Check the circuit for leaks, repair them and fill the circuit with R407C
according to the quantities indicated on the technical name-plate.

Check the current absorption of the compressors and fans and compare them with the values
indicated in the technical data.

Check the electrical absorption of all the components.

Check the direction of rotation of the compressor, as indicated in the previous chapter
(electrical installation section). If it is incorrect, invert the wires.

After having completed the start-up, please fill in the start-up form which is supplied with each
unit and send a copy to the address on the form.

Once the system is working at full power: 1) check that no alarms have occurred; 2) check
that the air discharged from the condenser flows correctly without being drawn into the
cooling unit; 3) check that the fans work properly; 4) check, with the unit running, that the
supply voltage remains within the values indicated on the technical name-plate; 5) check that
the unit works according to the set logic (described in the following sections).
Switching off
To switch off the unit, turn off all the power supplies.
The ON-OFF button on the C2020 display (if present) is only used to put the unit on
stand-by. It must therefore not be considered as a safety device for switching off
the unit prior to maintenance operations.