Trane TVR Pro CO Series Service Manual page 22

18-22HP
Cooling operation
Figure 2-3.3: 18-22HP refrigerant flow during cooling operation
High temperature, high pressure gas
High temperature, high pressure liquid
Low temperature, low pressure
8
4
3
2
2
1
1
Oil return operation in cooling mode
Figure 2-3.4: 18-22HP refrigerant flow during oil return operation in cooling mode
8
7 7
EXVA
XX°C
6
5
T3
XX°C
T4
13
11
12
13
SV2
13
9
10
21
Unit on
Fan
Thermostat on
on
Filter
Filter
Normal control
Unit on
Fan
on Thermostat on
Filter
Filter
Normal control
Unit off
Fan
off
Filter
Filter
Closed
Unit on
Fan
Thermostat off
on
Filter
Filter
Closed