Figure 7.13 Electronic Expansion Valve (Eev) - Carrier PrimeLINE Operation And Service Manual

Container refrigeration units

Table of Contents

7.18.2

Cleaning Procedure

1. Remove the upper evaporator access panel inside of the unit.

2. Spray the surface with water before applying the cleaning solution. This helps the cleaner work better.

3. Liberally apply the prepared cleaner solution (5 parts water and 1 part cleaner).

4. Allow the cleaner to soak in for five to seven minutes.

5. Assess area for rinsing. Follow all local regulations regarding disposal of waste water.

6. Thoroughly rinse the cleaner and surrounding area, floor, etc. When rinsing where heavy foaming solution is

present, it is very important to take the time to thoroughly rinse the equipment and surroundings.

7. Always rinse the empty coil cleaner bottle, cap tightly and dispose of properly.

7.19 Electronic Expansion Valve (EEV)

The electronic expansion valve (EEV) is an automatic device which maintains required superheat of the refrigerant

gas leaving the evaporator. The valve functions are: (a) automatic response of refrigerant flow to match the

evaporator load and (b) prevention of liquid refrigerant entering the compressor. Unless the valve is defective, it

seldom requires any maintenance.

1) Electronic Expansion Valve

2) Coil Boot

7.19.1

Removing an EEV

Always turn OFF the unit circuit breakers (CB-1 & CB-2) and disconnect main power supply

before working on moving parts.

1. Pump down the compressor (see

2. Turn unit power off and remove power from the unit.

3. Remove the coil.

4. Remove the valve. The preferred method of removing the valve is to cut the connection between the brazed

section and the valve, using a small tube cutter. Remove the valve. Alternatively, use a wet rag to keep the

valve cool. Heat inlet and outlet connections to valve body and remove valve.

5. Clean the valve stem with mild cleaner, if necessary.

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