2-2
T-309
2.1.3 Evaporator Section
The evaporator section (Figure 2-2) contains the return
recorder sensor, return temperature sensor, evaporator
expansion valve, unloader valve, suction modulation
valve, dual-speed evaporator fans (EM1 and EM2),
evaporator coil and heater, defrost heaters, defrost
temperature sensor, heat termination thermostat and
suction temperature sensor.
The evaporator fans circulate air through the container
by pulling it in the top of the unit, directing it through
the evaporator coil, where it is heated or cooled, and
discharging it at the bottom.
The evaporator components are accessible by removing
the upper rear panel (as shown in the illustration) or by
removing the front access panels.
14
11
12
1
2
3
4
5
7
8
15
9
16
13
10
17
6
1. Evaporator Fan Motor #1
2. Return Recorder/Temperature Sensor
3. Humidity Sensor
4. Evaporator Fan Motor #2
5. Defrost Temperature Sensor
6. Heater Termination Thermostat
7. Evaporator Coil
8. Evaporator Coil Heaters
9. Evaporator Expansion Valve Bulb
10. Evaporator Expansion Valve
11. Low Side Access Valve
12. Suction Modulating Valve
13. Suction Temperature Sensor
14. To Compressor
15. From Coil
16. To Coil
17. Unloader Solenoid Valve
Figure 2-2 Evaporator Section
