WDE
55
© STULZ SpA . – all rights reserved EN/36B/08.2018
Optional auxiliary relay #2
Phase rotation check
DIP switch number
DIP switch number
15
Setting
16
Setting
OFF
Normal
OFF
Enabled
ON
Up-to-speed
ON
Disabled
11.13. Soft start for single-phase compressor – SOFTM
DANGER
Hazardous voltage: will cause death or serious injury. Disconnect power before working on
equipment.
ATTENTION
Setting of this component is made in factory and shown in the wiring diagram. Before altering it,
contact STULZ service.
INFORMATION
SOFTM option is not available for WDE40 with single phase power supply and refrigerant
R407C.
The Soft Start option is available for single phase power supply units up to WDEA0, in the units
with refrigerant R134a.
The other options available with SOFTM are the crankcase heater (CRA), main switch (SWx),
voltage control device (VCC) and electrical reheat (RSC). Please note that it’s necessary to
choose between option SWx or options VCC + RSC, together with Soft Start.
To verify the availability of SOFTM option with 230V/1ph/60Hz power supply, please contact
your local partner STULZ.
With SOFTM option, the working limit of the unit is 45°C external temperature.
The soft start is installed inside the e-box on the supply line to the compressor. Its purpose is the
reduction of compressor starting current and torque.
Technical data
Power supply
230 V AC +10% / -15% / 50/60Hz
Nominal operating current
25A / 32A max. / AC-53a; AC-58a
Protection class according to IEC 529 IP 20
