Water Type Heat Exchanger; Frequency Inverter; Refrigerant Volume; Refrigerant Properties - Carrier 30RB-170R Installation, Operation And Maintenance Instructions

13 - STANDARD MAINTENANCE
IMPORTANT:
Never use a pressure water spray without a large diffuser.
Concentrated and/or rotating water jets are strictly forbidden.
Never use a fluid with a temperature above 45 °C to clean the
air-cooled exchangers.
Correct and frequent cleaning (approximately every three
months) will prevent two thirds of corrosion problems. Protect
the electrics box during cleaning operations.

13.7 - Water type heat exchanger

Check that:
- The insulation has not been detached or torn during
operations,
- The heaters and probes are operating and correctly
positioned in their supports,
- The water-side connections are clean and show no sign of
leakage,
- The periodic inspections required by local regulations have
been carried out

13.10 - Refrigerant properties

R32 properties
Relative
Saturated temp.
pressure
-20 306
-19 321
-18 337
-17 354
-16 371
-15 388
-14 406
-13 424
-12 443
-11 463
-10 483
-9 503
-8 524
-7 546
-6 568
-5 591
-4 614
-3 638
-2 662
-1 687
0 713
1 739
2 766
3 794
Saturated temperatures (°C) based on the relative pressure (in kPa)
Relative
Saturated temp.
pressure
4 822
5 851
6 881
7 912
8 943
9 974
10 1007
11 1040
12 1074
13 1109
14 1144
15 1181
16 1218
17 1256
18 1295
19 1334
20 1375
21 1416
22 1458
23 1501
24 1545
26 1635
25 1590
27 1682
13.8 - Variable frequency drive
IMPORTANT: Before any work on the variable frequency
drive, ensure that the circuit is isolated and there is no voltage
present (reminder: The capacitors take approximately
5 minutes to discharge once the circuit breaker has been
opened). Only appropriately qualified personnel are
authorised to work on the variable frequency drive.
In case of any alarm or persistent problem related to the variable
frequency drive, contact the manufacturer's service department.
The variable frequency drives fitted on the units do not require a
dielectric test, even if being replaced: they are systematically
checked before delivery. Moreover, the filtering components
installed in the variable frequency drive can falsify the measurement
and may even be damaged. If there is a need to test the insulation
of a component (fan motors and pumps, cables, etc.), the variable
frequency drive must be disconnected from the power circuit.

13.9 - Refrigerant volume

It is essential to run the unit in cooling mode to find out whether
the charge is correct; this is done by checking the actual
subcooling.
Following a slight leak, it will be possible to detect a drop in the
refrigerant charge from the initial charge, and this will affect the
subcooling value obtained at the air-cooled exchanger outlet;
it cannot, however, be detected in heating mode.
IMPORTANT:
it is therefore not possible to optimise the charge in heating
mode following a leak. The unit must be run in cooling mode
if the charge needs topping up.
Relative
Saturated temp.
pressure
28 1730
29 1778
30 1828
31 1878
32 1929
33 1982
34 2035
35 2090
36 2145
37 2202
38 2260
39 2318
40 2378
41 2439
42 2501
43 2565
44 2629
45 2695
46 2762
47 2830
48 2899
49 2969
50 3041
51 3114
Relative
Saturated temp.
pressure
52 3189
53 3264
54 3341
55 3420
56 3500
57 3581
58 3664
59 3748
60 3833
61 3920
62 4009
63 4099
64 4191
65 4284
66 4379
67 4476
68 4575
69 4675
70 4777
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