Carrier 69NT20-531-300 manual Evaporator Section

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.

3		5
					7
4
2
1
8
			11	12	6
	10	17
9
15
14
16
		13

1.	Evaporator Fan Motor #1	10.	Evaporator Expansion Valve
2.	Return Recorder/Temperature Sensor	11.	Low Side Access Valve
3.	Humidity Sensor	12.	Suction Modulating Valve
4.	Evaporator Fan Motor #2	13.	Suction Temperature Sensor
5.	Defrost Temperature Sensor	14.	To Compressor
6.	Heater Termination Thermostat	15.	From Coil
7.	Evaporator Coil	16.	To Coil
8.	Evaporator Coil Heaters	17.	Unloader Solenoid Valve

9.Evaporator Expansion Valve Bulb

Figure 2-2 Evaporator Section

T-309 2-2