Trane 4TVH0086FE000AA Service Manual page 37

Oil return operation in heating mode and defrosting operation
Figure 2-3.15: 26/28HP refrigerant flow during oil return operation in heating mode and during defrosting operation
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
E S C
6
5
4
3
2
T7C1
T7C2
1
1
Heating operation
Figure 2-3.16: 26/28HP refrigerant flow during heating operation
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
E S C
6
5
4
3
2
T7C1
T7C2
1
1
11 11
10 10
7
T3
T4
2
15
15
9
SV9
11 11
10 10
7
T3
T4
2
15
15
9
SV9
13
8
SV5
EXVA
14
EXVC
8
13
8
SV5
EXVA
14
EXVC
8
36
Filter
480 steps
Filter
480 steps
Filter
480 steps
12
Filter
480 steps
Filter
Normal control
Filter
Normal control
Filter
Closed
12
Filter
Closed
Unit on
Fan
Thermostat on
off
Filter
Unit on
Fan
Thermostat on
off
Filter
Unit off
Fan
off
Filter
Unit on
Fan
Thermostat off
off
Filter
Unit on
Fan
Thermostat on
on
Filter
Unit on
Fan
Thermostat on
on
Filter
Unit off
Fan
off
Filter
Unit on
Fan
Thermostat off
on
Filter