AQUACIAT
POWER
EN - 8
4.5
Temperature sensors
Temperature sensors constantly measure the temperature of
various components of the unit, ensuring the correct operation
of the system.
Water heat exchanger entering and leaving water
temperature sensors
The water heat exchanger entering and leaving water
temperature sensors are used for capacity control and safety
purposes.
Outdoor air temperature sensor
This sensor measuring the outdoor air temperature is used for
start-up, setpoint temperature reset and frost control.
Suction gas temperature sensors
These sensors measure the suction gas temperature. They are
used for the EXV control. Suction gas temperature sensors are
located at the suction side of each circuit.
Master/slave water sensor (optional)
This sensor measures the common water temperature in the
master/slave system capacity control. It is installed only in the
case of master/slave units.
Defrost temperature sensors (heat pumps)
These sensors are used to determine the end of the defrost
cycle for a given circuit.
Temperature setpoint reset sensor (Energy Management
Module)
This sensor measures the space (room) temperature for the
purpose of setpoint reset.
Heat Reclaim leaving water temperature sensor (HR option)
This factory-mounted temperature sensor is located on the
BPHE condenser outlet. It measures the water temperature
leaving the condenser and it is used to determine the activation
of the heat recovery.
Heat Reclaim control water temperature sensor (HR option)
This water temperature sensor is used to measure the water
temperature on the customer side and it is located either before
or after the 3 way-valve. In case the variable-speed pump is
used instead of the 3-way valve, then this sensor is located on
the BPHE condenser inlet.
Free Cooling water temperature sensor (FC option)
The Free Cooling water temperature sensor is located at
the output of Free Cooling coils and at the input of the water
exchanger. This sensor is used to control the Free Cooling
capacity.
4 - HARDWARE
4.6 Actuators
Electronic expansion valve
The electronic expansion valve (EXV) is used to adjust the
refrigerant flow to changes in the operating conditions of the
machine. The high degree of accuracy with which the piston is
positioned provides precise control of the refrigerant flow and
suction superheat.
Water flow switch
For units without internal pumps, a flow switch is mounted
to ensure that the minimum flow rate required for the correct
operation and protection of the system is maintained.
The minimum flow rate threshold depends on the unit size and
is configured automatically at the start-up. If the flow switch
fails, the alarm condition shuts off the unit.
Water heat exchanger pumps (optional)
The controller can regulate one or two fixed speed or variable
speed water heat exchanger pumps and takes care of the
automatic changeover between these pumps.
Four-way valve (heat pumps)
The control actuates the four-way valve for cooling / heating
mode and defrosts' sessions.
Three-way valve (HR option) *
The controller actuates the three-way valve to let the water flow
through the Heat Reclaim condenser.
Variable-speed pump (HR option) *
The controller can regulate the variable-speed pump (0-10V) to
control the Heat Reclaim condenser water flow.
* The customer can connect either a 3-way valve or a variable-speed
pump. These actuators are not provided by the Manufacturer!
Heat Reclaim flow switch (HR option)
This Heat Reclaim flow switch is used to detect water flow
inside the BPHE condenser. This flow switch is not provided by
the Manufacturer.
