Pressure / Temperature Table; Routine Maintenance; Microchannel Coil Maintenance; Table 6 - Pressure / Temperature Of The R32 - Daikin EWAT_B Series Installation, Maintenance And Operation Manual

Pressure / temperature table

°C
-28
-26
-24
-22
-20
-18
-16
-14
-12
-10
-8
-6
-4

Routine maintenance

This chiller must be maintained by qualified technicians. Before beginning any work on the system the personnel shall
assure that all security precautions have been taken.
Neglecting unit maintenance could degrade all parts of the units (coils, compressors, frames, pipes, etc.) with negative
effect on performances and functionality.
There are two different levels of maintenance, which can be chosen according to the type of application (critical/non critical)
or to the installation environment (highly aggressive).
Examples of critical applications are process cooling, data centers, etc.
Highly Aggressive Environments can be defined as the follows:

Industrial environment (with possible concentration of fumes result of combustion and chemical process);

Coastal environment;

Highly polluted urban environment;

Rural environment close to of animal excrement and fertilizers, and high concentration of exhaust gas from diesel
generators;

Desert areas with risk of sandstorms;

Combinations of the above.
Table 7 lists all Maintenance activities for standard applications and standard environment.
Table 8 lists all Maintenance activities for critical applications or highly aggressive environment.
Unit exposed to a highly aggressive environment can face corrosion in a shorter time than ones installed on a standard
environment. Corrosion causes a rapid rusting of the frame core, consequently decreases unit structure life time. To avoid
that, it is necessary to wash periodically the frame surfaces with water and suitable detergents.
In case of part of unit frame paint came off, it is important to stop its progressive deterioration by repainting the exposed
parts using proper products. Please contact factory to get the required products specifications.
In case of just salt deposits are present, it is enough to rinse the parts with fresh water.
4.2.1 Microchannel Air Condenser Maintenance
Routine cleaning of air condenser surfaces is essential to maintain proper operation of the unit, avoid corrosion and rusting.
Elimination of contamination and removal of harmful residues will greatly increase the life of the coil and extend the life of
the unit.
Relative to fin and tube heat exchangers, microchannel coils tend to accumulate more of the dirt on the surface and of the
less dirt inside which can make them easier to clean.
The following maintenance and cleaning procedure are recommended as part of the routine maintenance activities:
1. Remove surface dirt, leaves, fibers, etc. with a vacuum cleaner (preferably with a brush or other soft attachment rather
than a metal tube), compressed air blown from the inside out, and/or a soft bristle (not wire!) brush. Do not impact or
scrape the coil with the vacuum tube, air nozzle, etc.
Note: Use of a water stream, such as a garden hose, against a surface loaded coil will drive the fibers and dirt into the coil.
This will make cleaning efforts more difficult. Surface loaded fibers must be completely removed prior to using low velocity
clean water rinse.
D-EIMAC01706-18EN- 22/32

Table 6 - Pressure / Temperature of the R32

Bar °C Bar
2.97 -2 7.62
3.22 0 8.13
3.48 2 8.67
3.76 4 9.23
4.06 6 9.81
4.37 8 10.43
4.71 10 11.07
5.06 12 11.74
5.43 14 12.45
5.83 16 13.18
6.24 18 13.95
6.68 20 14.75
7.14 22 15.58
°C Bar °C
24 16.45 50
26 17.35 52
28 18.30 54
30 19.28 56
32 20.29 58
34 21.35 60
36 22.45 62
38 23.60 64
40 24.78 66
42 26.01 68
44 27.29 70
46 28.61 72
48 29.99 74
Bar
31.41
32.89
34.42
36.00
37.64
39.33
41.09
42.91
44.79
46.75
48.77
50.87
53.05