Carrier 50UA-UH 135 - Maintenance Details: Refrigerant and Servicing; Refrigerant Volume and Characteristics; Servicing and Final Recommendations

Correct and frequent cleaning (approximately every three
MONTHSWILLPREVENTOFTHECORROSIONPROBLEMS
Protect the control box during cleaning operations.
ʾ˂ƖˆƘ½¾ÊÁ¿½Ê¹ÆÌÎÇÄÍŽ
4HEUNITMUSTBEOPERATEDINCOOLINGMODETOlND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 affect 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
anadditional charge is required.
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-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
UA-UH135-205 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.).
ʾ˂ƖʾʾƘ½ÊÎÁ»ÁÆ¿ʽ»ÇÅŽƼ¹ÌÁÇÆË
s "EFOREREPLACINGANYOFTHEELEMENTSINTHECOOLING
circuit, ensure that the entire refrigerant charge is
removed from both the high and low pressure sides of
the unit.
s 4HECONTROLELEMENTSOFTHECOOLINGSYSTEMAREHIGHLY
sensitive. If they need to be replaced, care should be
taken not to overheat them with blowlamps whilst
soldering. A damp cloth should be wrapped around
THECOMPONENTTOBESOLDEREDANDTHEmAMEDIRECTED
away from the component body.
s 3ILVERALLOYSOLDERINGRODSSHOULDALWAYSBEUSED
s )FTHETOTALUNITGASCHARGEHASTOBEREPLACEDTHE
quantity should be as given on the nameplate and the
unit should be properly evacuated beforehand.
s $URINGUNITOPERATIONALLPANELSSHOULDBEINPLACE
including the electrical box access panel.
s )FITISNECESSARYTOCUTTHELINESOFTHEREFRIGERANT
circuit, tube cutters should always be used and never
tools which produce burrs. All refrigerant circuit tubing
should be of copper, specially made for refrigeration
purposes.
ʾ˂ƖʾʿƘÁƹÄʽ»ÇÅŽƼ¹ÌÁÇÆË
The unit you have purchased has undergone strict quality
control procedures before leaving the factory.
All components, including the control systems and electrical
EQUIPMENTETCARECERTIlEDBYOUR1UALITY#ONTROL$EPART
ment, and tested under the harshest possible operating
conditions in our laboratories. However, after leaving the
factory, it is possible that one or more of these elements
may be damaged due to causes beyond our control. In
such an event, the user should not work on any of the
internal components, or subject the unit to operating
CONDITIONSWHICHARENOTSPECIlEDINTHISMANUALSINCE
serious damage may result and the guarantee would be
invalidated. Repair and maintenance work should always
be left to the installer.
All recommendations concerning unit installation are
intended to be as a guideline. The installer should carry out
the installation according to the design conditions and should
comply with all applicable regulations for air conditioning
and refrigeration installations.
NOTE: The manufacturer does not accept responsibility for
any malfunctions resulting from misuse of the equipment.
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