30
Installation, operation and maintenance instructions - VMGFE102
Level 2
The two cleaning products can be used for any of the
following coil fi nishes: Cu/Cu, Cu/Al, Cu/Al with Polual,
Blygold and/or Heresite protection.
Clean the coil, using appropriate products.
We recommend TOTALINE products for coil cleaning:
Part No. P902 DT 05EE: traditional cleaning method
Part No. P902 CL 05EE: cleaning and degreasing.
These products have a neutral pH value, do not contain
phosphates, are not harmful to the human body, and can be
disposed of through the public drainage system.
Depending on the degree of fouling both products can be
used diluted or undiluted.
For normal maintenance routines we recommend using 1 kg
of the concentrated product, diluted to 10%, to treat a coil
surface of 2 m
2
. This process can either be carried out using a
high-pressure spray gun in the low-pressure position. With
pressurised cleaning methods care should be taken not to
damage the coil fi ns. The spraying of the coil must be done:
•
in the direction of the fi ns
•
in the opposite direction of the air fl ow direction
•
with a large diff user (25-30°)
•
at a minimum distance of 300 mm from the coil.
It is not necessary to rinse the coil, as the products used are
pH neutral. To ensure that the coil is perfectly clean, we
recommend rinsing with a low water fl ow rate. The pH value
of the water used should be between 7 and 8.
WARNING: Never use pressurised water without a large
diff user. Do not use high-pressure cleaners for Cu/Cu and Cu/
Al coils.
Concentrated and/or rotating water jets are strictly
forbidden. Never use a fl uid with a temperature above 45°C to
clean the air heat exchangers.
Correct and frequent cleaning (approximately every three
months) will prevent 2/3 of the corrosion problems.
Protect the control box during cleaning operations.
16.7 - Water heat exchanger maintenance
Check that:
•
the insulating foam is intact and securely in place.
•
the cooler heaters are operating, secure and correctly
positioned.
•
the water-side connections are clean and show no sign
of leakage.
16.8 - Refrigerant volume
The unit must be operated in cooling mode to fi nd out, if the
unit charge is correct, by checking the actual subcooling.
Following a small refrigerant leak a loss of refrigerant,
compared to the initial charge will be noticeable in the
cooling mode and aff ect the subcooling value obtained at
the air heat exchanger (condenser) outlet, but it will not be
noticeable in the heating mode.
IMPORTANT: It is therefore not possible to optimise the
refrigerant charge in the heating mode after a leak. The unit
must be operated in the cooling mode to check, if an
additional charge is required.
16.9 - Characteristics of R-410A
Saturated temperatures (°C) based on the relative pressure (in kPa)
Saturated
temperature, °C
Relative
pressure, kPa
Saturated
temperature, °C
Relative
pressure, kPa
-20
297
25
1552
-19
312
26
1596
-18
328
27
1641
-17
345
28
1687
-16
361
29
1734
-15
379
30
1781
-14
397
31
1830
-13
415
32
1880
-12
434
33
1930
-11
453
34
1981
-10
473
35
2034
-9
493
36
2087
-8
514
37
2142
-7
535
38
2197
-6
557
39
2253
-5
579
40
2311
-4
602
41
2369
-3
626
42
2429
-2
650
43
2490
-1
674
44
2551
0
700
45
2614
1
726
46
2678
2
752
47
2744
3
779
48
2810
4
807
49
2878
5
835
50
2947
6
864
51
3017
7
894
52
3088
8
924
53
3161
9
956
54
3234
10
987
55
3310
11
1020
56
3386
12
1053
57
3464
13
1087
58
3543
14
1121
59
3624
15
1156
60
3706
16
1192
61
3789
17
1229
62
3874
18
1267
63
3961
19
1305
64
4049
20
1344
65
4138
21
1384
66
4229
22
1425
67
4322
23
1467
68
4416
24
1509
69
4512
70
4610
AR05 units use high-pressure R-410A refrigerant (the unit
operating pressure is above 40 bar, the pressure at 35°C air
temperature is 50% higher than for R-22). Special equipment
must be used when working on the refrigerant circuit
(pressure gauge, charge transfer, etc.).
