WDE
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EN/36B/08.2018 © STULZ SpA – all rights reserved
11. Options
INFORMATION
On all WDE40-60-80 models some options do not fit all together. Maximum three of the
following four options can be ordered on the same unit:
• RSC heating resistance
• SWT / SWM main switch
• SOFTT / SOFTM softstart
• PSCR (phase sequencing control) and/or VCC (voltage control relay)
11.1. Protective treatment on condenser and evaporator – TREATW
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.
11.2. Stainless steel casing – PAKIN
With this option, external panel and fixing flanges of the units are made of stainless steel AISI 304
sheet. As standard, with stainless steel casing, units are painted like the units with zinc plated sheet
casing.
11.3. Seaworthy case packaging - SEAPACK
Wooden packaging with special treatment suitable for sea freight.
11.4. Refrigerant R134a
With standard R407C the upper limit of external temperature is +50°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. 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.
