Cooling Circuit And Probe Positioning - Riello NexPolar Series Installation And Technical Service Instructions

GENERAL INFORMATION
1.11

Cooling circuit and probe positioning

The cooling circuit is of the heat pump type with a refrigerant gas
reversal cycle. The source fluid utilized is the external air, while the
utility fluid is water, with the possible inclusion of a antifreeze liq-
uid.
During the wintertime, the heat pump extracts the thermal ener-
gy from the external air and delivers it to the utility fluid, thereby
1 Compressor
2 2-way solenoid valve
3 Cycle reversal valve
4 Brazed plate heat exchanger
5 Receiver
6 Electronic expansion valve
7 Flow indicator
8 Dehydration filter
9 Finned coil
10 Suction separator
heating it. During the summertime the cycle is reversed, and the
thermal energy is extracted from the water, which is cooled, and is
delivered to the external air.
Based on the type of system, the utility fluid is delivered to the fan
coils, the air treatment unit, the radiant panels for heating or cool-
ing the rooms, or the boiler in order to produce domestic hot water.
11 High pressure-switch
12 Safety valve
13 Low pressure transducer
14 Safety valve
15 Service valve
16 Service valve
17 Electric freeze-protection
heating element for heat switch
18 Electric fans
10
•
Probes
to external air temperature
tl finned coil temperature upper
te finned coil temperature lower
td gas delivery temperature
ts suction temperature
sst suction saturation relay
electric TR refrigerant temperature
LWT water delivery temperature
EWT water return temperature