62-12023
5-14
5.16 Evaporator Coil Cleaning
The use of recycled cardboard cartons is increasing. The recycled cardboard cartons create much more fiber dust
during transport than “new” cartons. The fiber dust and particles are drawn into the evaporator where they lodge
between the evaporator fins. If the coil is not cleaned on a regular basis, sometimes as often as after each trip, the
accumulation can be great enough to restrict air flow, cause coil icing, repetitive defrosts and loss of unit capacity.
Due to the “washing” action of normal defrost, the fiber dust and particles may not be visible on the face of the coil
but may accumulate deep within.
It is recommended to clean an the evaporator coil on a regular basis, not only to remove cardboard dust, but to
remove any grease oil film which sometimes coats the fins and prevents water from draining into the drain pan.
Cardboard fiber particles after being wetted and dried several times can be very hard to remove. Therefore, several
washings may be necessary.
1. Spray coil with a mild detergent solution such as any good commercial-grade automatic dish washer deter-
gent and let the solution stand for a few minutes. Reverse flush (opposite normal air flow) with clean water
at mild pressure. A garden hose with spray nozzle is usually sufficient. All drain lines must be clean.
2. Run unit until defrost mode be initiated to check for proper draining from drain pan.
5.17 Condenser Coil Cleaning
Remove all foreign material from the condenser coil by reversing the normal air flow. (Air is pulled in through the
front.) Compressed air or water may be used as a cleaning agent. It may be necessary to use warm water mixed
with any good commercial dishwasher detergent. Rinse coil with fresh water if a detergent is used.
Table 5–6 R-404A Temperature-Pressure Chart
Temperature
Pressure
°F
°
C
Psig
Kg/cm
2
Bar
-40
-40
4.5
0.32
0.31
-35
-37
7.1
0.50
0.49
-30
-34
9.9
0.70
0.68
-25
-32
12.9
0.91
0.89
-20
-29
16.3
1.15
1.12
-18
-28
17.7
1.24
1.22
-16
-27
19.2
1.35
1.32
-14
-26
20.7
1.46
1.43
-12
-24
22.3
1.57
1.54
-10
-23
23.9
1.68
1.65
-8
-22
25.6
1.80
1.77
-6
-21
27.3
1.92
1.88
-4
-20
29.1
2.05
2.01
-2
-19
30.9
2.17
2.13
0
-18
32.8
2.31
2.26
2
-17
34.8
2.45
2.40
4
-16
36.8
2.59
2.54
6
-14
38.9
2.73
2.68
8
-13
41.1
2.89
2.83
10
-12
43.3
3.04
2.99
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