Panasonic VRF TOP comfort

As a standard, from 2006 all Panasonic VRF systems include the special VET technology,
with variable coolant temperature.

Variable Evaporation and Condensation Temperature

The “smart logic” checks the temperature every 30 seconds and automatically adjusts the coolant temperature according to real demand and outdoor conditions, ensuring better energy performance at all times.

Coolant evaporation temperature (°C)
Temperature varies from 16 °C to 3 °C.
Similarly, the condensation temperature is also variable and is adjusted to the room thermal load, within a range of 33–55 °C.

Coolant evaporation temperature (°C)
A. Saving
B. It adjusts to the room thermal load
C. Comfort
D. Thermal load
1. Variable ET
2. Constant ET
3. Variable CT
4. Constant CT

Example of cooling mode (heating mode is also available)


Indoor environment with a low
thermal load

The evaporation temperature is kept
at a high temperature

Maximum energy saving


Higher thermal load

The evaporation temperature lowers, adjusting itself to the thermal load

Maximum comfort


Maximum thermal load

The evaporation temperature lowers further

Maximum performance
1. Evaporation temperature
2. Room thermal load

Technical focus Variable temperatures

A. Evaporation temperature
B. Condensation temperature
C. Optimal working range for the compressor
D. Thermal load

Control of the discharge temperature

This special function is available in all of Panasonic VRF systems’ indoor units to guarantee maximum comfort for the end user.
For example, in cooling mode, if the temperature of the discharged air was below 10 °C, the user may feel discomfort, just as he would do in heating mode if the temperature was far too high.
With the Panasonic control of the discharge air temperature, this can be adjusted within a cooling range of 7–22 °C.

A. Intake
B. Fan
C. Battery R410A
D. Discharge > Example of cooling > It can be set between 7 and 22 °C
E. Air thermistor IN
F. Cooling thermistor IN E1 / OUT E3
G. Air thermistor OUT