GENERAL INFORMATION
12
1.11 Refrigerant circuit and sensors positioning
The cooling circuit is of the heat pump type with cycle inversion on
the refrigerant gas. The source fluid used is the external air while
the user fluid is water possibly added with antifreeze liquid.
In winter the heat pump extracts the thermal energy from the out-
side air and transfers it to the user fluid by heating it, while in sum
-
mer the cycle is inverted and the thermal energy is extracted from
the water, which cools down, and is transferred to the air. external.
Depending on the type of system, the user fluid is sent to fan coil
units, air treatment units, radiant panels for room air conditioning or
to the boiler for the production of domestic hot water.
1
Compressor
2
Cycle reversal valve
3
Plate heat exchanger
4
Collector
5
Electronic expansion valve
6
Condenser coil
7
Intake separator
8
Service valva
9
Electric fans
A
Circulation pump
B
Safety valve
C
Flow switch
D
Expansion vessel
E
Air bleed
F
Hydronic module
•
Probes
to
outside air temperature
tl
higher finned coil temperature
te
lower finned coil temperature
td
gas delivery temperature
ts
suction temperature
TR
coolant temperature
LWT water delivery temperature
EWT return water temperature
(1)
Only model 11 - 15
(2)
P024 and P027 only model 11 - 15
