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10 - SAFETY ELEMENTS
Low pressure pressostat
Connected to the compressor suction, it will
stop its operation when the pressure at that
point goes down below the tare value (caused
by obstructions in the circuit, excessive dirt in the fi lters, fan stop
or ice formation in the evaporator). It disconnects at 2 bar and it
is automatically reactivated.
High pressure pressostat
Connected to the compressor discharge, it will
stop its operation when the pressure at that
point reaches the setpoint. Disconnects at 42
bar and is reactivated automatically.
Magnetothermal protection switches line
They are located at the beginning of the power lines for the
compressor and motor fan to protect them.
Main door switch
By using a mechanical device, it impedes access to the electric
panel when the unit is with voltage.
Automatic switch in the control circuit
Magnetothermal switch that protects the operation circuit against
continuous surges as well as against high currents of short duration
(short circuits).
Location of the control and safety elements
Sight glass
B4
HP
LP
Compr.
Liquid receiver (heat pump)
Expansion
B6
valve
Plates
exchanger
No-return valve
B7
Air coil
Water circulation control
A diff erential pressure switch detains the operation of the unit when
it does not detect water circulation.
Water anti-freeze protection
This safety device is built into the electronic control. This is activated
in COOLING mode when the water outlet temperature is lower
than the set value. This causes the stop of the outdoor fan and
the compressor.
Note: For operation with glycol water: consult.
Refrigerant anti-freeze protection
This safety device is built into the units' electronic control. It is
activated when, working in COOLING mode, the indoor refrigerant
temperature is lower than the setpoint value. This causes the stop
of the outdoor fan and the compressor.
Anti-freeze protection with heaters (optional)
Anti-freeze protection with fl exible electrical heaters around the
pipe lines of the hydraulic circuit to avoid their freezing. This
optional is recommended with negative temperatures.
Safeties at the compressor
The scroll type compressor that these units as standard have the
following safeties:
■ Non-return valve built into the compressor.
■ Thermal protection in the compressor, which stops the operation
of the motor when there is excessive heating.
■ Protection of the compressor discharge temperature through
a klixon.
E
30PA control
B1
Device
Differential
pressure
switch
Inlet water exchanger
probe
B3
S
Outdoor air probe
Oulet water exchanger
Drain
bleeder
probe
Compressor discharge
probe
Refrigerant anti-freeze
probe on the exchanger
Outdoor coil pressure
Outdoor
transducer
air
B2
Low-pressure pressostat 2 bar
High-pressure pressostat 42 bar
Adjustment Symbol
B1
B2
B3
30PA
controller
B4
B6
B7
LP
HP
17
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