Water chillers and
air-water heat pumps
HEAT PUMPS - AIR CONDITIONING - REFRIGERATION - AIR HANDLING - HEAT EXCHANGE - NA 12.122 H
34
CIATCooler LP
Connected to the compressor discharge, it will
stop its operation when the pressure at that point
reaches the setpoint. Disconnects at 42 bar and
It’s reset manually.
This safety device performs the appropriate control based on the
measurement of a low-pressure electronic sensor.
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).
Magnetothermal protection switches line
They are located at the beginning of the power lines for the compressor
(s) and motor fan(s) to protect them.
Main door switch
High pressure pressostat
Low pressure safety device
10. SAFETY ELEMENTS
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 outdoor fan, the compressor and the
electrical tank heater connection to be stopped (in LPC/ILPC models
with a hydraulic module).
Note: For operation with glycol water: please consult.
Water circulation pump control
For units that include a circulation pump, the electronic control times
its disconnection after the unit is disconnected.
The electronic control also activates a safety device in the event of
pump failure which detains the operation of the unit.
Water circulation control
A circulation control device, differential pressostat or fl ow switch,
depends on the model, detains the operation of the unit when it does
not detect water circulation (please refer to the “Schematic diagrams
of the hydraulic circuit”).
Defrost control
This control's mission is to eliminate the ice that might possible form on
the outdoor coil when the unit is working in HEAT CYCLE.
The control runs a defrost cycle when, after the fi xed time has elapsed
for the compressor working, the temperature measured at the defrost
probe is below the one set for its beginning. In the defrost operation, the
outdoor fan(s) is(are) stopped and the cycle inversion valve triggers the
operation in cooling MODE. Next the tank heater is connected (in LPC/
ILPC models with a hydraulic module) and, if necessary, the outdoor
fans are connected.
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 outdoor fan, the
compressor and the electrical tank heater connection to be stopped
(in LPC/ILPC models with a hydraulic module).
Liquid receiver safety valve
The heat pump models 320 to 960 (STD version) and 200 to 720
(HEE version) include a safety valve in the liquid receiver. Valve tare
value at 45 bar.
Caution: Avoid the valve triggering direction.
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 by means of a
discharge probe.
By using a mechanical device, it impedes access to the electric panel
when the unit is with voltage.
Water safety valve
LPC/ILPC units include a safety valve with a tare value of 4 bar (see
hydraulic diagrams) in the hydraulic circuit.
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.
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