Carrier 38AW050H7 - Unit Protection Devices; Troubleshooting

11
38AW-
Maintenance
Unit protection devices
Operating
mode
Type of safety device What happens
When the safety device
trips
Heating
Protection against excessively high
heat exchanger temperatures
Compressor operation frequency is
reduced or stopped altogether
During functioning
Heating
Outdoor heat exchanger defrost
cycle
The outdoor unit fans are switched o During functioning
Cooling
Indoor heat exchanger frost
protection
Compressor operation frequency is
reduced or stopped altogether
During functioning
Cooling or
heating
Delayed compressor start
The compressor does not start
immediately when the appliance is
switched on
On start-up or on mode
change
IMPORTANT!
During functioning in heat pump heating mode, the unit performs defrost cycles to eliminate any ice that might form at low
temperatures inside the outdoor unit.
The following maintenance operations must be carried
out by qualied personnel.
Cleaning the coil
If necessary, proceed as follows for more careful cleaning
of the coil:
Switch the mains supply OFF.
Troubleshooting
System does not start:
t &MFDUSJDBMDPOOFDUJPOTBSFXSPOHPSJODPNQMFUFöYUIFN
t 4PNFTXJUDIPSCSBLFSBSFJOUIF0''QPTJUJPOQMBDFUIFN
in the ON position.
t 8BJUGPSNJOVUFTQSPUFDUJPOBHBJOTUGSFRVFOU
compressor cycling is ON..
t 4FMFDUFEUFNQFSBUVSFJTMPXFSUIBOBDUVBMUFNQFSBUVSFPS
higher in cooling mode).
System is not supplying enough heating (or cooling):
t "JSDBOOPUDJSDVMBUFGSFFMZBSPVOEUIFPVUEPPSVOJU
t %JSUZXBUFSöMUFSJOUIFIZESPOJDNPEVMFSFEVDFTXBUFS
ow.
t %PPSTBOEPSXJOEPXTBSFPQFO
t 1VNQTQFFEJOUIFIZESPOJDNPEVMFJTUPMPX1VNQ
speed must be changed by skilled personnel only.
t 4FMFDUFEUFNQFSBUVSFJTOPUDPSSFDU
Remove unit top cover by losening the xing screws and
lifting the cover. Carefully clean the coil with a vacuum
cleaner from inside to outside. With the same vacuum
cleaner, remove the dust from inside the fan compartment
and the fan blades. Avoid any damage to the blades which
may cause future vibrations and noise.
Replace the unit cover and tighten the screws.
A slight whistling noise is heard when the outdoor unit
starts or stops:
t 5IJTJTEVFUPUIFSFGSJHFSBOUCFHJOOJOHUPDJSDVMBUFPSBO
adjustment of the refrigerant pressures. This is a normal
operating condition.
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