SystemAir Combi Unit Genius, Installation, Operation And Maintenance Instructions

Page: 44 / 124

9.2.1 High and Low Pressure Sensors
Check / Change
WARNING
Danger electrical voltage!
» The entire unit must be disconnected from the mains before service work!
» Observe the 5 Security Rules!
"
Disconnect the plug connection.
"
Dismount the sensor bottom part.
The sensor base is connected by means of a Schrader valve to the refrigeration system. It can be removed without draining the refriger-
ant circuit.
9.2.2 Expansion Valve
The electronic expansion valve controls the superheat in the refrigerant circuit. Opening or closing of the valve controls the temperature
intake in combination with the respective power control of the compressor.
9.2.3 Temperature Sensors
NTC sensors are used to measure the operating temperatures such as suction and hot gas in the refrigeration circuit. These are designed
as contact sensor for the ducts.
T [°C] R [k
W
] T [°C] R [k
W
]
-20 16.538 +30 1.825
-15 12.838 +35 1.510
-10 10.051 +40 1.256
-5 7.931 +45 1.056
0 6.306 +50 0.891
+5 5.040 +55 0.751
+15 4.056 +60 0,636
+20 2.674 +65 0.534
+25 2.200
Table 2: Temperature/Resistance
9.2.4 4-way Reverse Cycle Valve
The 4-way reverse cycle valve switches the refrigeration circuit between heating, cooling and defrosting. The valve is soldered in the
refrigeration circuit. It is controlled by a screwed magnetic coil.
9.2.5 Refrigerant Filter Drier
The soldered bi-directional filter drier protects the refrigeration system.
9.2.6 Membrane Expansion Tank
see „8.4.1 Membrane Expansion Tank“ page 40.
44
Service
Genius - V 1.0