Stulz Tel-Air-2 Series, Operating Instructions Manual

Page: 60 / 72

E/0618/35A/60
12. Options
On TLx40
– 60 options VCC, PSCR, SWT, SWM in combination with options SOFTM
or SOFTT, CRA, RSC do not fit all together. Please contact technical support for
further information.
12.1 Protective treatment on coils
– TREATT
It’s a protective treatment on condenser and evaporator surface in order to protect them against
corrosion by salt spray. This option consists of epoxy treatment on the evaporator surface and
cataphoresis treatment on condenser surface. This treatment reduces efficiency of the heat
exchanger.
12.2 Electrical reheat
– RSC
This option is useful when heating of the internal air is required. The electrical reheat is made of
aluminium and includes a safety device. It is controlled directly by C2020 microprocessor.
Heaters are divided in single-phase modules, each with 1,5 kW of heating capacity and 6,52 A
current absorption at nominal voltage.
12.3 Monitoring of phase sequence and phase loss (for 3-phase scroll compressors)
–
PSCR
Protection relay for phase sequence and phase loss installed in the electrical box. In case of
incorrect phase sequence or phase loss, the relay automatically switch off the compressor to
protect them from damage . Automatic reset when failure is no longer present. LED indication for
power on and fault.
12.4 Refrigerant R134a
With standard R407C the upper limit of external temperature is +45°C. With R134a, units can
work up at higher temperatures, although also the operating temperature limit of the condenser
fans has to be verified as a special model may be required, depending on maximum outdoor
working temperature. Since with R134a, compressors have a lower efficiency than with R407C,
with this option a bigger compressor is installed to achieve roughly the same total cooling
capacity as with standard R407C refrigerant.
With R134a refrigerant, single phase power supply is only available up to TLx90.
In the following pages the technical data sheets of units with R134a.
NOTES ON TECHNICAL DATA:
* Inclusive of power absorbed by evaporator fans. External temperature 35°C / internal
temperature 30°C / internal relative humidity 30%.
** Sound pressure level at 2 m obtained from the measured sound power according to the
EN ISO 9614-2 on normal condition of use and nominal operating condition.