Stulz SplitAir3 SAL40 - Motors; Electrical Components of Protection and Control

29 © STULZ SpA . – all rights reserved EN/39B/06.2018
SAL
4.8. Motors
Compressor
Electric motor is positioned inside the compressor. It's mounted on vibration dampers to reduce
vibrations.
Fans
Evaporator fans are radial, with impeller of fibreglass-reinforced plastic. Condenser fans are axial,
with press-fitted sheet steel blank blades, sprayed with PP plastic; these fans are manufactured in
accordance with Standard EN 6180051 / CE. They have F insulation class and class I protection
(according to Standard EN 50178 and EN 603351).
The motor protection is IP54 for both the evaporator and condenser fans, in accordance with
Standard DIN EN 600345.
Noise levels are consistent with Standard DIN EN 45635 part 1 or ISO 3745.
Free cooling servomotor (inside optional free cooling module)
Electric servomotor with built-in travel stop switch and overload protection.
Protection degree: IP54; protection class: II.
4.9. Electrical components of protection and control
Contactors
They control the motors by operating with auxiliary voltage. They refer to IEC94741 standards.
Automatic circuit breakers
They protect against short circuits and excessive motor current. They have adjustable thermal and
magnetic triggering devices.
Temperature probes
Four PTC temperature probes are connected to analogue inputs of electronic controller: four are
located in the internal unit and one in the external part, in order to measure the following parameters:
Internal unit:
• Intake of internal air temperature, the probe is placed in the rear panel of the internal unit;
• Supply air temperature, the probe is mounted after the evaporator, behind the grilled panel;
• Surface temperature of the evaporator for antifreeze purpose, the probe is located inside the
evaporator fins.
External unit:
• External air temperature, the probe is under the base of the external unit.